Patent Application
20110247834
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The invention is related in general to equipment for servicing subterranean wells. The invention relates to a deepsea cement head that is intended to drop a combination of darts, balls, bombs and canisters in order to activate downhole equipment, launch cementing plugs, deliver chemical products, or the like.
Existing tools implement a modular design with darts that are preloaded in baskets within the modules. The modules are connected to one another using clamps. The darts are held in place mechanically and released by removing the mechanical obstruction and redirecting the flow of the pumped fluid through the dart basket. The darts are then pumped through the tool by the fluid. The first dart to be launched is placed in the lowest module, with subsequent darts passing through the baskets vacated by the earlier darts.
Darts in prior designs are launched by blocking the bypass flow of the process fluid and forcing the fluid through the dart chamber. The dart forms an initial seal when placed into the basket. When fluid enters the dart chamber, pressure builds and breaks the seal, forcing the dart out of the basket, through the tool and into the main process-fluid stream.
Some prior art designs consist of modules similar to those described in U.S. Pat. Nos. 4,624,312 and 4,890,357. The darts are loaded from the topmost module, through the swivel if necessary, and pushed down to their respective baskets with a long rod. The modules have valves that are used to select between the dart and the bypass flow. The valve itself serves as the mechanical obstruction that prevents the dart from prematurely launching. When the valve is turned, it simultaneously opens a passage for the dart while closing the passage of the bypass flow.
It remains desirable to provide improvements in wellsite surface equipment in efficiency, flexibility, and reliability.
The present invention allows such improvement.
In a first aspect, the present invention relates to a multiple activation-device launching system for a cementing head, comprising a launcher body comprising at least one launching chamber and a device chamber, the launching chamber sized to receive one or more activation devices therein, the launching chamber in fluid communication with a power source for launching the activation device from the device chamber. The launching system may also comprise pressure-sensing devices, pressure-relief devices, volume-measurement devices, or combinations thereof, in hydraulic communication with one or more launching chambers, for monitoring the activation-device launching process.
In another aspect, the present invention aims at a method for deploying one or more activation devices into a process-fluid system, utilizing an angled launching system for a cementing head. The launching system comprises a launcher body comprising a primary valve and at least one launching chamber and a device chamber, the launching chamber equipped with a secondary valve and sized to receive one or more activation devices therein, the launching chamber in fluid communication with a power source for launching one or more activation devices into the device chamber. The method may also comprise one or both of the following operations during the launch of one or more activation devices: (i) monitoring the fluid pressure inside the launching chamber and (ii) measuring the process-fluid volume displaced into the launching chambers. Data acquired during these operations allow the operator to confirm successful activation-device deployment.
In a further aspect, the present invention pertains to a method for deploying one or more activation devices into a process-fluid system, utilizing an angled launching system for a cementing head. The launching system comprises a launcher body comprising at least one launching chamber and a device chamber, the launching chamber sized to receive one or more activation devices therein, the launching chamber in fluid communication with an external power source for launching one or more activation devices into the device chamber. The method may also comprise one or both of the following operations during the launch of one or more activation devices: (i) monitoring the fluid pressure inside the launching chamber and (ii) measuring the fluid volume displaced into the launching chambers from the external power source. Data acquired during these operations allow the operator to confirm successful activation-device deployment.
An embodiment of the invention comprises a single activation-device launcher module that contains multiple launching chambers arranged at an angle relative to the main axis of the tool. The activation devices may be darts, balls, bombs or canisters. The devices are loaded into their respective chambers directly or in a cartridge, but directly from the open air rather than through the length of the tool. A variety of methods can be used to launch the activation devices. The activation devices may also contain chemical substances that, upon exiting the launching chamber, are released into the well.
The advantages of the general implementation of the embodiment is that more activation devices may be fit into a shorter length tool, simplifying the loading process, and making the baskets more accessible for maintenance purposes. This allows easy maintenance of the tool on the rig, while the system from the art can only be serviced at the district.
In another embodiment of the invention, the system may comprise any number of launching chambers (at least one, but preferably two, three, four or more), each with an axis at an angle relative to the main axis of the tool. The chamber(s) may be positioned at the same level, or a different level (e.g. in spiral, or stages). When the activation devices are forced out of the chamber(s), they enter the main body of the tool in the correct orientation and are swept away by the pumped fluid (hereafter called process fluid) to serve their intended purpose. The exact number of chambers is not essential; indeed, multiple unique launching methods that will work independently from the arrangement of the launching chambers are contemplated.
In another embodiment, the activation devices are launched with process-fluid power as the motive power. Each launching chamber is preferably linked to the main flow of process fluid using a small pipe, hose, or integral manifold. A valve (primary valve) blocks the main flow on command, diverting the fluid into the launching chambers. Each launching chamber would comprise a valve (secondary valve) that alternately allows or blocks the flow of fluid into the corresponding launching chamber. All valves may be manually or remotely actuated. In a launch procedure, all secondary valves are initially closed, the primary valve is initially open. To launch an activation device, the operator opens the secondary valve corresponding to the activation device's chamber and then closes the primary valve. Once the activation device is successfully ejected from the launching chamber, the primary valve is reopened and the launch procedure is repeated for launching additional activation devices.
In another embodiment, external fluid power is used to launch the activation devices from their chambers. The external fluid power employed to force the activation device from its chamber may comprise water or fluid connected directly behind the activation device; a hydraulic cylinder with a rod that forces the dart out of its chamber, a hydraulic piston without a rod that seals within the launching chamber (activation device on one side, external fluid on the other), a bladder behind the activation device that fills from an external fluid source pushing the activation device out of the chamber, or a similar type of fluid power as will be appreciated by those skilled in the art.
In a preferred embodiment, external fluid power is used to launch the activation devices from their chambers. The external fluid power employed to force the activation device from its chamber may comprise water or fluid connected directly behind the activation device; a hydraulic cylinder with a rod that forces the dart out of its chamber, a hydraulic piston without a rod that seals within the launching chamber (activation device on one side, external fluid on the other), a bladder behind the activation device that fills from an external fluid source pushing the activation device out of the chamber, or a similar type of fluid power as will be appreciated by those skilled in the art. This preferred embodiment further comprises operations by which the progress of the activation-device launch process may be monitored. The operations comprise (i) monitoring the fluid pressure inside a launching chamber with one or more pressure sensors in hydraulic communication with the launching chamber; (ii) measuring the process-fluid volume displaced into the launching chamber; or both. Data acquired during these operations allow the operator to confirm successful activation-device deployment.
It will be appreciated by those skilled in the art that monitoring fluid pressure and fluid volume during activation-device deployment may be a useful practice with other similar activation-device launching systems that employ a fluid driven piston, bladder or other barrier device.
Although the disclosed launching system is mainly being presented in the context of well cementing, it will be appreciated that the process-fluid stream could comprise other well fluids including, but not limited to, drilling fluids, cement slurries, spacer fluids, chemical washes, acidizing fluids, gravel-packing fluids and scale-removal fluids.
According to one embodiment, the invention involves the diversion of process-fluid flow from the principal flow stream through the launcher body to one of the launching chambers. Referring to
The primary valve preferably needs only to withstand enough differential pressure to force the activation device from the launching chamber. The primary valve may be a plug valve, a butterfly valve, a balloon-shaped bladder that inflates from the center to seal the main fluid passage, a doughnut-shaped bladder that inflates from the edges to seal the main fluid passage, a pressure-operated rubber component similar to those used in blowout preventers (BOPs) or inflatable packers or similar type valve, as will be appreciated by those skilled in the art.
The secondary valves may be any variety of on-off valves, but are preferably designed to be easily removed and cleaned after repeated exposure to particle-laden fluids such as cement slurry. The secondary valve may be a plug valve, a butterfly valve, a balloon-shaped bladder that inflates from the center to seal the main fluid passage, a doughnut-shaped bladder that inflates from the edges to seal the main fluid passage, a pressure-operated rubber component similar to those used in BOPs or inflatable packers, or similar type valve as will be appreciated by those skilled in the art.
In another embodiment, shown in
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Both embodiments described above may comprise equipment for monitoring the progress of the activation-device launching process. Such equipment may include pressure sensors, pressure-relief devices and volume-measurement devices, and combinations thereof that are in hydraulic communication with one or more launching chambers. Suitable pressure sensors include (but are not limited to) piezoresistive strain gauges, capacitive sensors, electromagnetic sensors, piezoelectric sensors and potentiometric sensors. Suitable pressure-relief devices may comprise (but not be limited to) rupture disks, pressure-relief valves, fusible-plug devices and combination rupture-disk/fusible-alloy devices. Suitable volume-measurement devices may comprise (but not be limited to) flowmeters, level sensors, visual sensors and pump-stroke counters.
In a preferred embodiment, shown in
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The preferred embodiment further comprises equipment for monitoring the progress of the activation-device launching process. Such equipment may include pressure sensors, pressure-relief devices and volume-measurement devices, and combinations thereof that are in hydraulic communication with one or more launching chambers. Suitable pressure sensors include (but are not limited to) piezoresistive strain gauges, capacitive sensors, electromagnetic sensors, piezoelectric sensors and potentiometric sensors. Suitable pressure-relief devices may comprise (but not be limited to) rupture disks, pressure-relief valves, fusible-plug devices and combination rupture-disk/fusible-alloy devices. Suitable volume-measurement devices may comprise (but not be limited to) flowmeters, level sensors, visual sensors and pump-stroke counters. It will be appreciated by those skilled in the art that such pressure-measurement and volume-measurement equipment may be may be useful with other similar activation-device launching systems that employ a fluid driven piston, bladder or other barrier device.
The activation device depicted in the drawings is a dart; however, activation devices may also include balls, bombs and canisters.
The activation devices may be filled with a chemical substance that, upon release from the launching chamber, is dispensed from the activation device into the process fluid. The chemical release may occur at any time after the activation device is launched—from the moment of launching to any time thereafter. Delayed chemical release may be performed for a number of reasons including, but not limited to, avoiding fluid rheological problems that the chemical would cause if added during initial fluid mixing at surface, and triggering the initiation of chemical reactions in the fluid (e.g., cement-slurry setting and fracturing-fluid crosslinking) at strategic locations in the well.
The process fluid may comprise one or more fluids employed in well-service operations. Such fluids include, but are not limited to, drilling fluids, cement slurries, spacer fluids, chemical washes, acidizing fluids, gravel-packing fluids and scale-removal fluids.
The present invention also comprises a method of operating the multiple activation-device launcher depicted in
The primary valve preferably needs only to withstand enough differential pressure to force the activation device from the launching chamber. The primary valve may be a plug valve, a butterfly valve, a balloon-shaped bladder that inflates from the center to seal the main fluid passage, a doughnut-shaped bladder that inflates from the edges to seal the main fluid passage, a pressure-operated rubber component similar to those used in BOPs or inflatable packers or similar type valve, as will be appreciated by those skilled in the art.
The secondary valves may be any variety of on-off valves, but are preferably designed to be easily removed and cleaned after repeated exposure to particle-laden fluids such as cement slurry. The secondary valve may be a plug valve, a butterfly valve, a balloon-shaped bladder that inflates from the center to seal the main fluid passage, a doughnut-shaped bladder that inflates from the edges to seal the main fluid passage, a pressure-operated rubber component similar to those used in BOPs or inflatable packers, or similar type valve as will be appreciated by those skilled in the art.
This method may include operations by which the progress of the activation-device launch process may be monitored. The operations comprise (i) monitoring the fluid pressure inside a launching chamber with one or more pressure sensors in hydraulic communication with the launching chamber; (ii) measuring the process-fluid volume displaced into the launching chamber; or both. Pressure monitoring may be performed by pressure sensors; however, In this particular method, pressure-relief devices are not employed owing to the lack of a piston, bladder or other barrier mechanism that drives the activation device out of the launching chamber. The activation device is launched by fluid flow only. Suitable pressure sensors include (but are not limited to) piezoresistive strain gauges, capacitive sensors, electromagnetic sensors, piezoelectric sensors and potentiometric sensors. Fluid-volume measurements may be performed by equipment that includes, but is not limited to, flowmeters, level sensors, visual sensors and pump-stroke counters. These monitoring operations may be performed in one or more launching chambers.
In a preferred embodiment, the present invention pertains to a method of operating the multiple activation-device launcher depicted in
This preferred embodiment includes operations by which the progress of the activation-device launch process can be monitored. The operations comprise (i) monitoring the fluid pressure inside a launching chamber with one or more pressure sensors in hydraulic communication with the launching chamber; (ii) measuring the process-fluid volume displaced into the launching chamber; or both. Pressure monitoring may be performed by pressure sensors, pressure-relief devices, or both. Unlike the previous method, pressure-relief devices may be employed if the activation-device launching system includes a piston, bladder or other barrier mechanism that drives the activation device out of the launching chamber. Suitable pressure sensors include (but are not limited to) piezoresistive strain gauges, capacitive sensors, electromagnetic sensors, piezoelectric sensors and potentiometric sensors. The pressure-relief devices may comprise one of more members of the list comprising: rupture disks, pressure-relief valves, fusible-plug devices and combination rupture-disk/fusible-alloy devices. Fluid-volume measurements may be performed by equipment that includes, but is not limited to, flowmeters, level sensors, visual sensors and pump-stroke counters. These monitoring operations may be performed in one or more launching chambers.
It will be appreciated by those skilled in the art that such pressure-measurement and volume-measurement operations may be useful with other similar activation-device launching systems that employ a fluid driven piston, bladder or other barrier device.
The methods of operating the multiple activation-device launcher depicted in
In the methods of operating the multiple activation-device launcher depicted in
The preceding description has been presented with reference to presently preferred embodiments of the invention. Persons skilled in the art and technology to which this invention pertains will appreciate that alterations and changes in the described structures and methods of operation can be practiced without meaningfully departing from the principle, and scope of this invention. Accordingly, the foregoing description should not be read as pertaining only to the precise structures described and shown in the accompanying drawings, but rather should be read as consistent with and as support for the following claims, which are to have their fullest and fairest scope.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2009/006748 | 9/16/2009 | WO | 00 | 6/28/2011 |
| Number | Date | Country | |
|---|---|---|---|
| 61195499 | Oct 2008 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12417126 | Apr 2009 | US |
| Child | 13121487 | US |
