1. Field of the Disclosure
This disclosure relates generally to wellbore operations, including generating electrical energy downhole and performing a downhole operation.
2. Brief Description of the Related Art
Oil wells (wellbores) are drilled to a selected depth in earth formations for the production of hydrocarbons. The wellbore is often lined with a casing. Perforations are made proximate production zones to flow the fluid from the formation into the casing. A production string containing flow control devices is placed inside the casing to flow the fluid to a surface location. In certain formations, fluid from the surface is supplied to the production zones to fracture the formation to enable the fluid from the formation to flow into the wellbore. Sensors and other electrically-operated devices are used to provide information about various downhole parameters and to perform one or more operations downhole. The production wells typically, do not have high fluid rates that can be used to generate electrical energy downhole. It is desirable to generate electrical energy that can be utilized to operate sensors and other devices downhole.
The disclosure herein provides a wellbore system in which electrical energy is generated and utilized to operate one or more devices downhole.
In one aspect, a wellbore system is disclosed that in one embodiment may include an inductive coil in the wellbore, a magnetic element conveyed from a surface location configured to oscillate in an opening in the coil to generate electrical energy, and a device in the wellbore that utilizes the generated electrical energy. In another aspect, the magnetic element may be oscillated by a device conveyed in the wellbore.
In another aspect, a method of performing an operation in a wellbore is disclosed that in one embodiment may include: placing an inductive coil in the wellbore, the coil having an opening; conveying a magnetic element into the opening of the coil; and moving the magnetic member in the opening of the coil to generate electrical energy in the coil.
Examples of certain features of the apparatus and method disclosed herein are summarized rather broadly in order that the detailed description thereof that follows may be better understood. There are, of course, additional features of the apparatus and method disclosed hereinafter that will form the subject of the claims appended hereto.
For detailed understanding of the present disclosure, references should be made to the following detailed description, taken in conjunction with the accompanying drawings, wherein like elements generally are designed with like numerals.
In one aspect, the wellbore 101 contains a sensor-coil unit 130 placed in or above (uphole) the lower production zone 110. In one aspect, the sensor-coil unit 130 includes an inductive coil 132, one or more sensors 134, an electrical power unit 136, such as a rechargeable battery, a control circuit 137 and a data transmission or communication circuit or device 138. Similarly, a sensor-coil unit 140 is placed uphole in or of the production zone 120 that may include a coil 142, one or more sensors 144, a power unit 146, a control circuit 147 and a data transmission or communication device 148. The sensor-coil unit 130 has an opening 152 through which a device may be passed. Similarly, the sensor-coil unit 140 includes an opening or passage 154. Sensors, 134 and 144 may include any suitable sensors for providing signals relating to one or more downhole parameters, including, but not limited to, pressure, temperature, water ingress, and fluid flow rate. The data communication units (138, 148) may include any device, including, but not limited to, an electromagnetic device, an acoustic device, an optical device and a pulser that generates pressure pulsed in the fluid in the wellbore. The sensor-coil unit (130, 140) may be secured inside the wellbore by any suitable mechanism, including, but not limited to, grapples and wickered slips.
In one aspect, the conveying member 360 is deployed in the wellbore 101 to locate the magnetic element 370 in the coil 132. The conveying member 360 is moved up and down (oscillated) or rotated, which causes electrical current to flow through the coil 132. The electrical current from the coil 132 charges the power unit 136, which supplies electrical energy to the sensors 134. Alternatively, the magnetic element 370 may be coupled to an oscillating device 372 that oscillates when electrical energy is supplied thereto from the surface, which causes the magnetic element 370 to oscillate inside the coil 132. Thus, in one aspect, the coil 132 in the wellbore and the magnetic member 370 conveyed from the surface produce electrical energy downhole, which energy is supplied to one or more devices downhole. Although, sensors 134 are shown as the downhole devices being powered by the downhole generated electrical energy, any other device, such as a valve 141 or sliding sleeve may be supplied with such downhole generated energy.
To perform a fracturing operation in the wellbore 101, fluid 314 is pumped from the surface 103. The sensors 114 measure selected parameters, such as pressure, temperature and flow rate, etc. of the fluid 314 in the wellbore proximate the production zone 110. The control circuit 137 processes the signals from the sensors 134 and the data transmission device 138 transmits the sensor data to the data acquisition device 380, which transmits the sensor data to the surface controller 390. The controller 390 determines values of one or more downhole parameters, such as pressure, temperature flow rate, and in response to one or more such downhole parameters controls the operation of the pumping unit 310. In
The foregoing disclosure is directed to the certain exemplary embodiments and methods. It will be apparent, however, to persons skilled in the art that many modifications and changes to the embodiments set forth above may be made without departing from the scope and spirit of the concepts and embodiments disclosed herein. It is intended that the following claims be interpreted to embrace all such modifications and changes.
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Number | Date | Country | |
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20140262218 A1 | Sep 2014 | US |