Wells may be drilled at various depths to access and produce oil, gas, minerals, and other naturally occurring deposits from subterranean geological formations. The drilling of a well is typically accomplished with a drill bit that is rotated within the well to advance the well by removing topsoil, sand, clay, limestone, calcites, dolomites, or other materials.
During or after drilling operations, sampling operations may be performed to collect a representative sample of formation or reservoir fluids (e.g., hydrocarbons) to further evaluate drilling operations and production potential, or to detect the presence of certain gases or other materials in the formation that may affect well performance. Sampling operations may be performed by a fluid sampling tool.
During sampling operations, a fluid sampling tool is disposed in a wellbore and may take pressure measurements, calculate mobilities that are horizontal to the wellbore and associated formations during sampling operations. As a basis to this measurement, current technology assumes that the fluid sampling tool measures parallel to a sand bed and the permeability is directly representative of both the reservoir and geology of the formation. This, however, is inaccurate and realistic. Generally, sand bedding planes may be at an angle different to the horizontal direction of a formation tester, affecting the measurement and consequently the permeability. Misrepresenting permeability may have drastic effects in estimating the production delivery of a field and result in further questions on the economic viability of a prospect.
The features and advantages of certain embodiments will be more readily appreciated when considered in conjunction with the accompanying figures. The figures are not to be construed as limiting any of the preferred embodiments.
The present disclosure relates to subterranean operations and, more particularly, embodiments disclosed herein provide methods and systems for representing a permeability calculation parallel to a bedding plane. This may be performed utilizing prior knowledge of geology, reservoir, and how the well is drilled. Methods and systems described below may be utilized to enhance current permeability calculations by incorporating theories of fluid mechanics to account for changes in the formation, which may be utilized to measure permeability of a bed, strata, and/or formation.
As illustrated, a hoist 108 may be used to run downhole fluid sampling tool 100 into wellbore 104. Hoist 108 may be disposed on a vehicle 110. Hoist 108 may be used, for example, to raise and lower conveyance 102 in wellbore 104. While hoist 108 is shown on vehicle 110, it should be understood that conveyance 102 may alternatively be disposed from a hoist 108 that is installed at surface 112 instead of being located on vehicle 110. Downhole fluid sampling tool 100 may be suspended in wellbore 104 on conveyance 102. Other conveyance types may be used for conveying downhole fluid sampling tool 100 into wellbore 104, including coiled tubing and wired drill pipe, for example. Downhole fluid sampling tool 100 may comprise a tool body 114, which may be elongated as shown on
In examples, fluid analysis module 118 may comprise at least one a sensor that may continuously monitor a fluid such as a reservoir fluid, formation fluid, wellbore fluid, or formation nonnative fluids such as drilling fluid filtrate. Such monitoring may take place in a fluid flow line or a formation tester probe such as a pad or packer or may be able to make measurements investigating the formation including measurements into the formation. Such sensors comprise optical sensors, acoustic sensors, electromagnetic sensors, conductivity sensors, resistivity sensors, selective electrodes, density sensors, mass sensors, thermal sensors, chromatography sensors, viscosity sensors, bubble point sensors, fluid compressibility sensors, flow rate sensors, pressure sensors, nuclear magnetic resonance (NMR) sensors. Sensors may measure a contrast between drilling fluid filtrate properties and formation fluid properties. Fluid analysis module 118 may be operable to derive properties and characterize the fluid sample. By way of example, fluid analysis module 118 may measure absorption, transmittance, or reflectance spectra and translate such measurements into component concentrations of the fluid sample, which may be lumped component concentrations, as described above. The fluid analysis module 118 may also measure gas-to-oil ratio, fluid composition, water cut, live fluid density, live fluid viscosity, formation pressure, and formation temperature and fluid composition. Fluid analysis module 118 may also be operable to determine fluid contamination of the fluid sample and may comprise any instrumentality or aggregate of instrumentalities operable to compute, classify, process, transmit, receive, retrieve, originate, switch, store, display, manifest, detect, record, reproduce, handle, or utilize any form of information, intelligence, or data for business, scientific, control, or other purposes. The absorption, transmittance, or reflectance spectra absorption, transmittance, or reflectance spectra may be measured with sensors 116 by way of standard operations. For example, fluid analysis module 118 may comprise random access memory (RAM), one or more processing units, such as a central processing unit (CPU), or hardware or software control logic, ROM, and/or other types of nonvolatile memory. Fluid analysis module 118 and fluid sampling tool 100 may be communicatively coupled via communication link 120 with information handling system 122.
Any suitable technique may be used for transmitting signals from the downhole fluid sampling tool 100 to the surface 112. As illustrated, a communication link 120 (which may be wired or wireless, for example) may be provided that may transmit data from downhole fluid sampling tool 100 to an information handling system 122 at surface 112. Information handling system 122 may comprise a processing unit 124, a monitor 126, an input device 128 (e.g., keyboard, mouse, etc.), and/or computer media 130 (e.g., optical disks, magnetic disks) that can store code representative of the methods described herein. Information handling system 122 may act as a data acquisition system and possibly a data processing system that analyzes information from downhole fluid sampling tool 100. For example, information handling system 122 may process the information from downhole fluid sampling tool 100 for determination of fluid contamination. The information handling system 122 may also determine additional properties of the fluid sample (or reservoir fluid), such as component concentrations, pressure-volume-temperature properties (e.g., bubble point, phase envelop prediction, etc.) based on the fluid characterization. This processing may occur at surface 112 in real-time. Alternatively, the processing may occur downhole hole or at surface 112 or another location after recovery of downhole fluid sampling tool 100 from wellbore 104. Alternatively, the processing may be performed by an information handling system in wellbore 104, such as fluid analysis module 118. The resultant fluid contamination and fluid properties may then be transmitted to surface 112, for example, in real-time.
Referring now to
As illustrated, a drilling platform 202 may support a derrick 204 having a traveling block 206 for raising and lowering drill string 200. Drill string 200 may comprise, but is not limited to, drill pipe and coiled tubing, as generally known to those skilled in the art. A kelly 208 may support drill string 200 as it may be lowered through a rotary table 210. A drill bit 212 may be attached to the distal end of drill string 200 and may be driven either by a downhole motor and/or via rotation of drill string 200 from the surface 112. Without limitation, drill bit 212 may comprise roller cone bits, PDC bits, natural diamond bits, any hole openers, reamers, coring bits, and the like. As drill bit 212 rotates, it may create and extend wellbore 104 that penetrates various subterranean formations 106. A pump 214 may circulate drilling fluid through a feed pipe 216 to kelly 208, downhole through interior of drill string 200, through orifices in drill bit 212, back to surface 112 via annulus 218 surrounding drill string 200, and into a retention pit 220.
Drill bit 212 may be just one piece of a downhole assembly that may comprise one or more drill collars 222 and downhole fluid sampling tool 100. Downhole fluid sampling tool 100, which may be built into drill collars 222 may gather measurements and fluid samples as described herein. One or more of the drill collars 222 may form a tool body 114, which may be elongated as shown on
Downhole fluid sampling tool 100 may further comprise one or more sensors 116 for measuring properties of the fluid sample reservoir fluid, wellbore 104, subterranean formation 106, or the like. The one or more sensors 116 may be disposed within fluid analysis module 118. In examples, more than one fluid analysis module may be disposed on drill string 200. The properties of the fluid are measured as the fluid passes from the formation through the tool and into either the wellbore or a sample container. As fluid is flushed in the near wellbore region by the mechanical pump, the fluid that passes through the tool generally reduces in drilling fluid filtrate content, and generally increases in formation fluid content. The downhole fluid sampling tool 100 may be used to collect a fluid sample from subterranean formation 106 when the filtrate content has been determined to be sufficiently low. Sufficiently low depends on the purpose of sampling. For some laboratory testing below 10% drilling fluid contamination is sufficiently low, and for other testing below 1% drilling fluid filtrate contamination is sufficiently low. Sufficiently low also depends on the nature of the formation fluid such that lower requirements are generally needed, the lighter the oil as designated with either a higher GOR or a higher API gravity. Sufficiently low also depends on the rate of cleanup in a cost benefit analysis since longer pumpout times required to incrementally reduce the contamination levels may have prohibitively large costs. As previously described, the fluid sample may comprise a reservoir fluid, which may be contaminated with a drilling fluid or drilling fluid filtrate. Downhole fluid sampling tool 100 may obtain and separately store different fluid samples from subterranean formation 106 with fluid analysis module 118. Fluid analysis module 118 may operate and function in the same manner as described above. However, storing of the fluid samples in the downhole fluid sampling tool 100 may be based on the determination of the fluid contamination. For example, if the fluid contamination exceeds a tolerance, then the fluid sample may not be stored. If the fluid contamination is within a tolerance, then the fluid sample may be stored in the downhole fluid sampling tool 100. In examples, contamination may be defined within fluid analysis module 118.
As previously described, information from downhole fluid sampling tool 100 may be transmitted to an information handling system 122, which may be located at surface 112. As illustrated, communication link 120 (which may be wired or wireless, for example) may be provided that may transmit data from downhole fluid sampling tool 100 to an information handling system 122 at surface 112. Information handling system 122 may comprise a processing unit 124, a monitor 126, an input device 128 (e.g., keyboard, mouse, etc.), and/or computer media 130 (e.g., optical disks, magnetic disks) that may store code representative of the methods described herein. In addition to, or in place of processing at surface 112, processing may occur downhole (e.g., fluid analysis module 118). In examples, information handling system 122 may perform computations to estimate asphaltenes within a fluid sample.
Each individual component discussed above may be coupled to system bus 304, which may connect each and every individual component to each other. System bus 304 may be any of several types of bus structures including a memory bus or memory controller, a peripheral bus, and a local bus using any of a variety of bus architectures. A basic input/output (BIOS) stored in ROM 308 or the like, may provide the basic routine that helps to transfer information between elements within information handling system 122, such as during start-up. Information handling system 122 further comprises storage devices 314 or computer-readable storage media such as a hard disk drive, a magnetic disk drive, an optical disk drive, tape drive, solid-state drive, RAM drive, removable storage devices, a redundant array of inexpensive disks (RAID), hybrid storage device, or the like. Storage device 314 may comprise software modules 316, 318, and 320 for controlling processor 302. Information handling system 122 may comprise other hardware or software modules. Storage device 314 is connected to the system bus 304 by a drive interface. The drives and the associated computer-readable storage devices provide nonvolatile storage of computer-readable instructions, data structures, program modules and other data for information handling system 122. In one aspect, a hardware module that performs a particular function comprises the software component stored in a tangible computer-readable storage device in connection with the necessary hardware components, such as processor 302, system bus 304, and so forth, to carry out a particular function. In another aspect, the system may use a processor and computer-readable storage device to store instructions which, when executed by the processor, cause the processor to perform operations, a method or other specific actions. The basic components and appropriate variations may be modified depending on the type of device, such as whether information handling system 122 is a small, handheld computing device, a desktop computer, or a computer server. When processor 302 executes instructions to perform “operations”, processor 302 may perform the operations directly and/or facilitate, direct, or cooperate with another device or component to perform the operations.
As illustrated, information handling system 122 employs storage device 314, which may be a hard disk or other types of computer-readable storage devices which may store data that are accessible by a computer, such as magnetic cassettes, flash memory cards, digital versatile disks (DVDs), cartridges, random access memories (RAMs) 310, read only memory (ROM) 308, a cable containing a bit stream and the like, may also be used in the exemplary operating environment. Tangible computer-readable storage media, computer-readable storage devices, or computer-readable memory devices, expressly exclude media such as transitory waves, energy, carrier signals, electromagnetic waves, and signals per se.
To enable user interaction with information handling system 122, an input device 322 represents any number of input mechanisms, such as a microphone for speech, a touch-sensitive screen for gesture or graphical input, keyboard, mouse, motion input, speech and so forth. Additionally, input device 322 may take in data from one or more sensors 136, discussed above. An output device 324 may also be one or more of a number of output mechanisms known to those of skill in the art. In some instances, multimodal systems enable a user to provide multiple types of input to communicate with information handling system 122. Communications interface 326 generally governs and manages the user input and system output. There is no restriction on operating on any particular hardware arrangement and therefore the basic hardware depicted may easily be substituted for improved hardware or firmware arrangements as they are developed.
As illustrated, each individual component described above is depicted and disclosed as individual functional blocks. The functions these blocks represent may be provided through the use of either shared or dedicated hardware, including, but not limited to, hardware capable of executing software and hardware, such as a processor 302, that is purpose-built to operate as an equivalent to software executing on a general-purpose processor. For example, the functions of one or more processors presented in
The logical operations of the various methods, described below, are implemented as: (1) a sequence of computer implemented steps, operations, or procedures running on a programmable circuit within a general use computer, (2) a sequence of computer implemented steps, operations, or procedures running on a specific-use programmable circuit; and/or (3) interconnected machine modules or program engines within the programmable circuits. Information handling system 122 may practice all or part of the recited methods, may be a part of the recited systems, and/or may operate according to instructions in the recited tangible computer-readable storage devices. Such logical operations may be implemented as modules configured to control processor 302 to perform particular functions according to the programming of software modules 316, 318, and 320.
In examples, one or more parts of the example information handling system 122, up to and including the entire information handling system 122, may be virtualized. For example, a virtual processor may be a software object that executes according to a particular instruction set, even when a physical processor of the same type as the virtual processor is unavailable. A virtualization layer or a virtual “host” may enable virtualized components of one or more different computing devices or device types by translating virtualized operations to actual operations. Ultimately however, virtualized hardware of every type is implemented or executed by some underlying physical hardware. Thus, a virtualization computer layer may operate on top of a physical computer layer. The virtualization computer layer may comprise one or more virtual machines, an overlay network, a hypervisor, virtual switching, and any other virtualization application.
Chipset 400 may also interface with one or more communication interfaces 326 that may have different physical interfaces. Such communication interfaces may comprise interfaces for wired and wireless local area networks, for broadband wireless networks, as well as personal area networks. Some applications of the methods for generating, displaying, and using the GUI disclosed herein may comprise receiving ordered datasets over the physical interface or be generated by the machine itself by processor 302 analyzing data stored in storage device 314 or RAM 310. Further, information handling system 122 receives inputs from a user via user interface components 404 and executes appropriate functions, such as browsing functions by interpreting these inputs using processor 302.
In examples, information handling system 122 may also comprise tangible and/or non-transitory computer-readable storage devices for carrying or having computer-executable instructions or data structures stored thereon. Such tangible computer-readable storage devices may be any available device that may be accessed by a general purpose or special purpose computer, including the functional design of any special purpose processor as described above. By way of example, and not limitation, such tangible computer-readable devices may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other device which may be used to carry or store desired program code in the form of computer-executable instructions, data structures, or processor chip design. When information or instructions are provided via a network, or another communications connection (either hardwired, wireless, or combination thereof), to a computer, the computer properly views the connection as a computer-readable medium. Thus, any such connection is properly termed a computer-readable medium. Combinations of the above should also be comprised within the scope of the computer-readable storage devices.
Computer-executable instructions comprise, for example, instructions and data which cause a general-purpose computer, special purpose computer, or special purpose processing device to perform a certain function or group of functions. Computer-executable instructions also comprise program modules that are executed by computers in stand-alone or network environments. Generally, program modules comprise routines, programs, components, data structures, objects, and the functions inherent in the design of special-purpose processors, etc. that perform particular tasks or implement particular abstract data types. Computer-executable instructions, associated data structures, and program modules represent examples of the program code means for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps.
In additional examples, methods may be practiced in network computing environments with many types of computer system configurations, including personal computers, hand-held devices, multi-processor systems, microprocessor-based or programmable consumer electronics, network PCs, minicomputers, mainframe computers, and the like. Examples may also be practiced in distributed computing environments where tasks are performed by local and remote processing devices that are linked (either by hardwired links, wireless links, or by a combination thereof) through a communications network. In a distributed computing environment, program modules may be located in both local and remote memory storage devices. During drilling operations information handling system 122 may process different types of the real time data which may be utilized to create an asphaltene onset pressure map (AOP).
A data agent 502 may be a desktop application, website application, or any software-based application that is run on information handling system 122. As illustrated, information handling system 122 may be disposed at any rig site (e.g., referring to
Secondary storage computing device 504 may operate and function to create secondary copies of primary data objects (or some components thereof) in various cloud storage sites 506A-N. In examples, cloud storage sites 506A-N may be one or more databases located on site or offsite. Additionally, secondary storage computing device 504 may run determinative algorithms on data uploaded from one or more information handling systems 122, discussed further below. Communications between the secondary storage computing devices 504 and cloud storage sites 506A-N may utilize REST protocols (Representational state transfer interfaces) that satisfy basic C/R/U/D semantics (Create/Read/Update/Delete semantics), or other hypertext transfer protocol (“HTTP”)-based or file-transfer protocol (“FTP”)-based protocols (e.g., Simple Object Access Protocol).
In conjunction with creating secondary copies in cloud storage sites 506A-N, the secondary storage computing device 504 may also perform local content indexing and/or local object-level, sub-object-level or block-level deduplication when performing storage operations involving various cloud storage sites 506A-N. Cloud storage sites 506A-N may further record and maintain DTC code logs for each downhole operation or run, map DTC codes, store repair and maintenance data, store operational data, and/or provide outputs from determinative algorithms that are fun at cloud storage sites 506A-N. This type of network may be utilized to an asphaltene onset pressure map (AOP).
Herein, NN 600 may be applied in a wide array of implementations. For example, NN 600 may be modeled for forming an AOP map, reservoir simulation, production decisions, or single AOP determinations. UAOP, the ARFO, or the BP from the gravimetric test are used in a NN model to identify the first AOP or the second AOP.
As such, input layer 604 may comprise any number of inputs 608. Inputs 608 may comprise properties of fluid and/or fluid formations such as physical properties (bulk or molecular) such as density, index of refraction, compressibility, bubble point, phase and/or other phase behavior properties measured by sampling tool 100. In examples, inputs may also comprise transport properties such as viscosity or thermal conductivity. Fluid analysis modules 118 may determine optical, chromatographic, mass spectrometry, density sensor, viscosity sensor, phase change apparatus compressibility sensor resistivity sensor, capacitance or dielectric sensor acoustic sensor, or combinations therein. Additionally, inputs 608 may also comprise chemical properties including composition i.e., hydrocarbon composition (methane, ethane propane, butane, pentane, hexane, higher hydrocarbons) and or chemical classes such as but not limited to Saturates, Aromatics, Resins or Asphaltenes chemical classes, and their respective concentrations of the various components, pH, eH, chemical potential, reactivity, fluid compatibility, and/or scaling potential. Fluid analysis modules 118 may determine optical, chromatographic, mass spectrometry, density sensor, viscosity sensor, phase change apparatus compressibility sensor resistivity sensor, capacitance or dielectric sensor acoustic sensor, or combinations therein. In other examples, inputs may comprise raw sensor measurements such as temperature, pressure, optical information, acoustic information, and/or electromagnetic information. Fluid analysis modules 118 may determine optical, chromatographic, mass spectrometry, density sensor, viscosity sensor, phase change apparatus compressibility sensor resistivity sensor, capacitance or dielectric sensor acoustic sensor, or combinations therein. In examples, output layer 606 may form outputs 610. Outputs 610 may comprise other unmeasured or less well measured physical or chemical properties, and/or correlated sensor measurements. For instance, outputs 610 may comprise scaling potential, or asphaltene onset pressure if not directly measured. Alternatively, the model may provide outputs 610 for enhanced resolution, precision or accuracy refinement of a measured property such as bubble point, or asphaltene onset pressure which may be comprised as an input 608 but refined as an enhanced measurement as an output 610 in output layer 606. Any of the inputs 608 or outputs 610 may be from the current well being evaluated or analogue wells which may be in the field, in the basis, or not so if other characteristics such as but not limited to formation type or formation fluid provide a basis for analogy. During operations, inputs 608 data are given to neurons 612 in input layer 604. Neurons 612, 614, and 616 are defined as individual or multiple information handling systems 122 connected in a network, which may compute information to make drilling, completion or production decisions such as but not limited how to drill the well, where to drill the well, how to complete a well, or where to complete a well, or how to produce a well, or where to produce a well. Any of computations may be from the current well being evaluated or analogue wells which may be in the field, in the basis, or not so if other characteristics such as but not limited to formation type or formation fluid provide a basis for analogy. The output from neurons 612 may be transferred to one or more neurons 614 within one or more hidden layers 602. Hidden layers 602 comprises one or more neurons 614 connected in a network that further process information from neurons 612. The number of hidden layers 602 and neurons 612 in hidden layer 602 may be determined by personnel that design NN 600. Hidden layers 602 is defined as a set of information handling system 122 assigned to specific processing. Hidden layers 602 spread computation to neurons 614, which may allow for faster computing, processing, training, and learning by NN 600. Output layers 606 may combine the processing in hidden layers 602, using neurons 616, to form an asphaltene onset pressure (AOP). By any of the modeling methods, output layers 606, wherein other methods may use different layer or subfunction structuring, may be coordinated such that simultaneously an AOP may be provided for different outputs each corresponding to a different depths or lateral distance across a field or distance from an injecting well, temperature or other state condition comprising at least formation or concentration of materials. Multiple outputs may be coordinated wherein the multiple outputs are different but related parameters which may comprise but is not limited to asphaltene onset pressure, and asphaltene stability index, either static for a single state, or as a function independent variable such as but not limited to depth or lateral distance across a field or distance from an injecting well or of state variables such as but not limited to temperature.
Information from fluid sampling tool 100 may be gathered and/or processed by the information handling system 122 (e.g., referring to
In examples, fluid sampling tool 100 may comprise one or more enhanced probe sections 704 and stabilizers 724. Each enhanced probe section may comprise a dual probe section 706 or a focus sampling probe section 708. Both of which may extract fluid from the reservoir and deliver said fluid to a channel 710 that extends from one end of fluid sampling tool 100 to the other. Without limitation, dual probe section 706 comprises two probes 712, 714 which may extend from fluid sampling tool 100 and press against the inner wall of wellbore 104 (e.g., referring to FIG. 1). Probe channels 716 and 718 may connect probe 712, 714 to channel 710 and allow for continuous fluid flow from the formation 106 to channel 710. A high-volume bidirectional pump 720 may be used to pump fluids from the formation, through probe channels 716, 718 and to channel 710. Alternatively, a low volume pump bi direction piston 722 may be used to remove reservoir fluid from the reservoir and house them for asphaltene measurements, discussed below. Two standoffs or stabilizers 724, 726 hold fluid sampling tool 100 in place as probes 712, 714 press against the wall of wellbore 104. In examples, probes 712, 714 and stabilizers 724, 726 may be retracted when fluid sampling tool 100 may be in motion and probes 712, 714 and stabilizers 724, 726 may be extended to sample the formation fluids at any suitable location in wellbore 104. As illustrated, probes 712, 714 may be replaced, or used in conjunction with, focus sampling probe section 708. Focus sampling prob section 708 may operate and function as discussed above for probes 712, 714 but with a single probe 728. Other probe examples may comprise, but are not limited to, oval probes, packers, or circumferential probes.
In examples, channel 710 may connect other parts and sections of fluid sampling tool 100 to each other. Additionally, a second high-volume bidirectional pump 730 may pump fluid through channel 710 to one or more multi-chamber sections 732, one or more fluid density modules 734, and/or one or more optics analyzers 736.
where Q is flow rate measured by fluid sampling tool 100 (e.g., referring to
and θ is the relative dip angle discussed above. Using Equations (1)-(5), discussed above, M is mobility and may be used to find different forms of mobility using:
In block 1404, fluid sampling tool 100 may be disposed in wellbore 104 (e.g., referring to
As illustrated in
By identifying the permeability of bedding plane 800, personnel may be able to identify the ability for a rock formation to transmit a fluid or gas. The calculation by all formation testers does not measure permeability directly, because there isn't a way to know the actual viscosity of the fluid during the test. However, workflow 1400 shows by knowing a viscosity value, how permeability may be rendered.
In block 1804, fluid sampling tools 1602, 1604 may be disposed in wellbore 104 (e.g., referring to
where C is the probe coefficient, q is the rate and Pmin is the minimum drawdown. In block 1814, fluid sampling tools 1602, 1604 may be moved to a second location identified in block 1802. However, the second location may be adjacent to the first location and thus fluid sampling tools 1602, 1604 may not need to be moved. In block 1816, the other fluid sampling tool 1602, 1604, not utilized in block 1812 may perform a second drawdown and build up operation at a second depth. As fluid sampling tools 1602, 1604 are orthogonal to each other, the second drawdown and build up operation is in the z direction. a second probe section 708 from a second formation sampling tool 100 is moved to the depth at which a drawdown and build up was performed in block 1812. In block 1816, a second probe section 708 of fluid sampling tool 1602 or 1604 not utilized in block 1812, is set at the depth in which a second drawdown and build up may be performed. A second drawdown and build up is performed in block 1818 to determine using the methods disclosed in block 1812 and Equation (9), but this operation is for the z direction.
In block 1820, anisotropies are calculated using measurements from block 1812, 1818, and from block 1822. In block 1822, both θ and φ are found from block 1802, where θ is the relative dip angle for both fluid sampling tools 1602, 1604 and p is a stratigraphic angle. Referring back to block 1820, MBed and MStrat are calculated from the anisotropic relationship shown in
In block 1824 using bed anisotropy calculations and strata anisotropy calculations from block 1824, bed mobility may be calculated using Equation (7) and strata mobility may be calculated using Equation (7) but in the stratigraphic plane solving for Mz. In block 1826, spatial mobility may be calculated by
Additionally, viscosity μ may be assumed, measured from mud filtrate, measured from the reservoir fluid or from a downhole fluid analysis technology. Using spatial mobility and viscosity, spatial permeability may be calculated in block 1828 using Equation (8), which multiplies bed mobility by viscosity. By identifying spatial permeability, personnel may be able to represent permeability in a 3D format that is suitable in Earth Models, where Geological and Geophysical calculations are represented. The benefit of this is to understand how the reservoir behaves according to geology and determine more accurate delineation of wells.
The methods and systems described above are an improvement over current technology in that these methods and systems stem from Geology, Geophysics, Petrophysics, Reservoir Engineering and Fluid mechanics. As part of the permeability calculation, prior knowledge of the formation is needed that comprises of the dip angle and bed height of the respective zone that is being tested. This information may be obtained either from Seismic knowledge of the basin, a Wireline Triaxial Resistivity (MCI) measurement, or an Imager (StrataXaminer, XRMI), which feeds into an equation that corrects existing permeability equations in the industry.
Additionally, current technology only represents permeability and mobility in a 2-dimensional format and formation testers calculate permeability with the assumption that maximum permeability (Mobility) is parallel to the probe (Mx or Mz). The workflows shown above are more representative versions of permeability calculations that align with the geology of the prospect. Geologists and Geophysicists think in a 3D space, and this workflow will allow Reservoir Engineers to translate permeability into this same representation. The end result is more accurate earth models.
Accordingly, this disclosure describes apparatus and methods that may relate to determining permeability of a formation and mobility a fluid within the formation. The apparatus, methods, and compositions may further be characterized by one or more of the following statements:
Statement 1: A method may comprise disposing a fluid sampling tool into a wellbore at a first location, taking a drawdown and build up measurement with the fluid sampling tool, and measuring a relative dip angle from the fluid sampling tool. The method may further comprise calculating a bed anisotropy from the drawdown and build up measurement and the relative dip angle, calculating a bed mobility from the bed anisotropy, and calculating a bed permeability from the bed mobility and a viscosity.
Statement 2: The method of statement 1, wherein the relative dip angle is measured from a horizontal plane emanating from the fluid sampling tool to a bed boundary.
Statement 3: The method of any previous statements 1 or 2, wherein a pressure in the x direction and a mobility in the x direction are found from the drawdown and build up measurement.
Statement 4: The method of any previous statements 1-3, wherein the viscosity is measured from a mud filtrate or reservoir fluid.
Statement 5: A method may comprise disposing a first fluid sampling tool and a second fluid sampling tool into a wellbore, wherein the first sampling tool and the second fluid sampling tool are orthogonal to each other, taking a first drawdown and build up measurement with the first fluid sampling tool in an x direction, and taking a second drawdown and build up measuring with the second fluid sampling too in the z direction. The method may further comprise measuring a first relative dip angle from the first fluid sampling tool, measuring a second relative dip angle from the second fluid sampling tool, identifying a stratigraphic angle from a database, calculating a bed anisotropy from the first drawdown and build up measurement, the second drawdown and build up measurement, the first relative dip angle, the second relative dip angle, and the stratigraphic angle, calculating a bed mobility from the bed anisotropy, and calculating a spatial permeability from the bed mobility and a viscosity.
Statement 6: The method of statement 5, wherein the first relative dip angle is measured from a first horizontal plane emanating from the first fluid sampling tool to a bed boundary.
Statement 7: The method of statement 6, wherein the second relative dip angle is measured from a second horizontal plane emanating from the second fluid sampling tool to a bed boundary.
Statement 8: The method of any previous statements 5 or 6, wherein a pressure in the x direction and a mobility in the x direction are found from the first drawdown and build up measurement.
Statement 9: The method of any previous statements 5, 6, or 8, wherein a pressure in the z direction and a mobility in the z direction are found from the second drawdown and build up measurement.
Statement 10: The method of any previous statements 5, 6, 8, or 9, wherein the viscosity is measured from a mud filtrate or reservoir fluid.
Statement 11: A system may comprise a first fluid sampling tool comprising a first sampling probe section, wherein the first sampling probe section performs a first drawdown and build up measurement with the first fluid sampling tool in an x direction and a second fluid sampling tool comprising a second sampling probe section and disposed orthogonal on a conveyance to the first fluid sampling tool, wherein the second fluid sampling tool performs a second drawdown and build up measuring with the second fluid sampling too in the z direction. The system may further comprise an information handling system connected to the first fluid sampling tool and the second fluid sampling tool and configured to identify a first relative dip angle from the first fluid sampling tool from the first fluid sampling tool or a database, identify a second relative dip angle from the second fluid sampling tool from the first fluid sampling tool or the database, and identify a stratigraphic angle from the database. The information handling system may be further configured to calculate a bed anisotropy from the first drawdown and build up measurement, the second drawdown and build up measurement, the first relative dip angle, the second relative dip angle, and the stratigraphic angle, calculate a bed mobility from the bed anisotropy; and calculate a spatial permeability from the bed mobility and a viscosity.
Statement 12. The system of statement 11, wherein the first relative dip angle is measured from a first horizontal plane emanating from the first fluid sampling tool to a bed boundary.
Statement 13: The system of statement 12, wherein the second relative dip angle is measured from a second horizontal plane emanating from the second fluid sampling tool to a bed boundary.
Statement 14: The system of any previous statements 11 or 12, wherein a pressure in the x direction and a mobility in the x direction are found from the first drawdown and build up measurement.
Statement 15: The system of any previous statements 11, 12, or 14, wherein a pressure in the z direction and a mobility in the z direction are found from the second drawdown and build up measurement.
Statement 16: The system of any previous statements 11, 12, 14, or 15, wherein the viscosity is measured from a mud filtrate or reservoir fluid.
Statement 17: The system of any previous statements 11, 12, or 14-16, wherein the spatial mobility is calculated using
where Mx is a mobility of a fluid in the x direction, Mz is the mobility of the fluid in the z direction, Mbed is the mobility of the fluid in a bed, and Mstrat is the mobility of the fluid in the stratigraphic plane.
Statement 18: The system of statement 17, wherein Mstrat is calculated using
wherein Fx is a force of the fluid exerted in the x direction and Fz is a force of the fluid exerted in the z direction.
Statement 19: The system of statement 17, wherein MBed is calculated using
wherein Fy is a force of the fluid exerted in they direction and Fx is a force of the fluid exerted in the x direction.
Statement 20: The system of any previous statements 11, 12, or 14-17, wherein the database is populated from one or more measurements from one or more wellbores.
The preceding description provides various embodiments of the systems and methods of use disclosed herein which may contain different method steps and alternative combinations of components. It should be understood that, although individual embodiments may be discussed herein, the present disclosure covers all combinations of the disclosed embodiments, including, without limitation, the different component combinations, method step combinations, and properties of the system. It should be understood that the compositions and methods are described in terms of “including,” “containing,” or “including” various components or steps, the compositions and methods can also “consist essentially of” or “consist of” the various components and steps. Moreover, the indefinite articles “a” or “an,” as used in the claims, are defined herein to mean one or more than one of the element that it introduces.
For the sake of brevity, only certain ranges are explicitly disclosed herein. However, ranges from any lower limit may be combined with any upper limit to recite arrange not explicitly recited, as well as, ranges from any lower limit may be combined with any other lower limit to recite a range not explicitly recited, in the same way, ranges from any upper limit may be combined with any other upper limit to recite a range not explicitly recited. Additionally, whenever a numerical range with a lower limit and an upper limit is disclosed, any number and any comprised range falling within the range are specifically disclosed. In particular, every range of values (of the form, “from about a to about b,” or, equivalently, “from approximately a to b,” or, equivalently, “from approximately a-b”) disclosed herein is to be understood to set forth every number and range encompassed within the broader range of values even if not explicitly recited. Thus, every point or individual value may serve as its own lower or upper limit combined with any other point or individual value or any other lower or upper limit, to recite a range not explicitly recited.
Therefore, the present embodiments are well adapted to attain the ends and advantages mentioned as well as those that are inherent therein. The particular embodiments disclosed above are illustrative only, and may be modified and practiced in different but equivalent manners apparent to those skilled in the art having the benefit of the teachings herein. Although individual embodiments are discussed, the disclosure covers all combinations of all of the embodiments. Furthermore, no limitations are intended to the details of construction or design herein shown, other than as described in the claims below. Also, the terms in the claims have their plain, ordinary meaning unless otherwise explicitly and clearly defined by the patentee. It is therefore evident that the particular illustrative embodiments disclosed above may be altered or modified and all such variations are considered within the scope and spirit of those embodiments. If there is any conflict in the usages of a word or term in this specification and one or more patent(s) or other documents that may be incorporated herein by reference, the definitions that are consistent with this specification should be adopted.
Number | Date | Country | |
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63357073 | Jun 2022 | US |