US20020112860A1 - Apparatus and method for electrically controlling multiple downhole devices - Google Patents
Apparatus and method for electrically controlling multiple downhole devices Download PDFInfo
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- US20020112860A1 US20020112860A1 US10/054,005 US5400502A US2002112860A1 US 20020112860 A1 US20020112860 A1 US 20020112860A1 US 5400502 A US5400502 A US 5400502A US 2002112860 A1 US2002112860 A1 US 2002112860A1
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- 238000004519 manufacturing process Methods 0.000 abstract description 15
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- 238000004891 communication Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
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- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000007175 bidirectional communication Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/16—Control means therefor being outside the borehole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
Definitions
- This invention relates generally to oilfield well operations and more particularly to an apparatus and method for electrically controlling multiple downhole devices.
- Prior art surface control systems generally require a surface platform at each well for supporting the control electronics and associated equipment. However, in may instances, the well operator would rather forego building and maintaining a costly platform. Thus, a problem is encountered in that use of present surface controllers require the presence of a location for the control system, namely the platform.
- the present invention provides a production well control system for controlling multiple downhole devices, preferably, but not limited to, valves, separated by thousands of meters. This system allows for economic, reliable and reversible means of controlling a plurality of downhole devices.
- a surface control unit, downhole control module and interface unit are provided for selectively controlling downhole devices.
- An important feature of this invention is the ability to access individually, or as a group, multiple devices (e.g., valves) arranged in a distributed scheme.
- the number of downhole devices that can be controlled by this apparatus is only limited by the data address sizes, the power delivered and the power consumed. Additionally, the apparatus is inherently more reliable with each downhole device electrically coupled to an interface unit having a unique, stored address which must correspond to a surface transmitted address before actuation of the downhole device.
- the control module automatically controls the downhole devices based upon a sensed downhole parameter or event. Therefore, using downhole sensors, the downhole control module will monitor actual downhole parameters (e.g., pressure, temperature, flow) and automatically execute control instructions to activate the downhole devices when parameters reach a preset limit or are outside of an optimum operating range.
- actual downhole parameters e.g., pressure, temperature, flow
- the downhole well production control system in the second embodiment automatically operates based on downhole conditions sensed in real time without the need for a surface or external signal.
- This important feature constitutes a significant advance in the field of production well control. Additional advantages of this system include elimination of the need for a surface platform and an even more reliable communication system since no surface to downhole actuation signal is required and the associated risk that such an actuation signal will be compromised is therefore rendered moot.
- a power source provides energy to the downhole control unit in both embodiments described below.
- Power for the power source can be generated, preferably, at the surface or in the wellbore (e.g., by a turbine generator) or supplied by energy storage devices such as batteries (or a combination of one or more power sources).
- the power source provides electrical voltage and current to the downhole electronics, electromechanical devices and sensors in the wellbore.
- FIG. 1 is a schematic diagram of a production system that employs the apparatus of the present invention
- FIG. 2 is a block diagram showing an interface unit in accordance with the present invention.
- FIG. 3 is a schematic diagram of the production system that employs an alternative embodiment of the present invention.
- FIG. 4 is a block diagram showing a control unit of the alternative embodiment.
- FIG. 1 is a schematic diagram of a production system 10 , including a conventional derrick 11 .
- a surface control unit 12 at the surface allows an operator to generate a command/request to be executed downhole.
- the operator may request downhole data or actuate one or more downhole devices by inputting a command into a communication terminal and display 16 .
- the command is communicated by wire or wireless to a power and communication system 14 .
- the power and communication system 14 generates a command sequence and sufficient voltage to drive the selected downhole device. Specifically, the power and communication system 14 encodes the operator ⁇ s command as a command signal using a synchronized communication technique, preferably Manchester data encoding. The power and communication system 14 also generates a sufficiently high voltage to ensure that the command signal and activation voltage arrive at a downhole control module 30 . The command signal and activation voltage are transmitted from the power and communication system 14 to the downhole control module 30 via twisted pair wiring housed in armored and shielded lines 22 extending downward from the surface 13 into the wellbore 20 .
- a synchronized communication technique preferably Manchester data encoding
- the downhole control module 30 Upon receipt of the command signal and activation voltage, the downhole control module 30 interprets and reformats the command signal before transmitting a command serial data package and the activation voltage via armored and shielded lines 23 , comprising a bi-directional four wire communication path comprising two wires for communicating power, one wire for communicating a clock pulse and one wire for communicating data.
- Power lines 24 and communication lines (e.g., clock pulse wire and data wire) 26 are connected to an interface unit 40 which is electrically coupled to at least one downhole device 41 , preferably, but not limited to, a valve.
- the downhole control module 30 may transmit the command signal and activation voltage to multiple interface units 40 , 50 , 60 , 70 , 80 , 90 and 100 in a distributed control scheme.
- the interface unit 40 comprises a bi-directional communication transmitter and receiver or transceiver 42 which receives and transmits the data and clock pulse from communication line 26 .
- the receiver/transmitter or transceiver 42 allows data to travel bi-directionally through the armored and shielded wire 23 in a half duplex manner.
- a programable logic unit 43 within the interface unit 40 , decodes the address and clock and compares the transmitted address in the command serial stream to the local address stored in memory 45 .
- the local address is either electrically programmed before or after the interface unit 40 is placed downhole or hardwired into the interface unit 40 prior to placement downhole.
- the downhole device drive circuit 44 will be energized and the downhole device 41 actuated (i.e., opens, closes, partially opens or closes) or data may be obtained from various downhole sensors including, but not limited to, a temperature sensor 46 , pressure sensor 47 , fluid sensor 48 and/or downhole device position sensor 49 . This data is then transmitted to the downhole control module 30 and the surface control unit 12 .
- the bi-directional transceiver 42 transmits the command serial stream to the next interface unit 50 downstream. Following this transmission, the transmitter portion of the transceiver 42 is de-energized and the receiver portion is energized. This process continues until the command serial stream reaches the appropriate interface unit containing the identical address as the transmitted address in the command serial stream.
- FIG. 3 illustrates an alternative embodiment of the present invention.
- the alternative embodiment includes a production system 10 comprising, in part, a conventional derrick 11 .
- the alternative embodiment does not require transmission of surface commands since actuation of the downhole device or group of downhole devices is initiated upon the sensing of a preset downhole parameter (e.g., temperature, pressure, flow or change in position of the downhole device) or event.
- a preset downhole parameter e.g., temperature, pressure, flow or change in position of the downhole device
- a power supply 12 is located at the surface to generate sufficient power to drive a downhole control unit 40 and at least one downhole device 41 .
- the power from the supply 12 is transmitted via armored and shielded lines 22 extending downward from the surface 13 into the wellbore 20 to the downhole control unit 40 and at least one downhole device 41 .
- power for the power supply can be generated in the wellbore (e.g., by a turbine generator) or supplied by energy storage devices such as batteries (or a combination of one or more power sources).
- FIG. 4 illustrates a block diagram of the downhole control unit 40 , comprising a sensor device 46 and a drive circuit 44 .
- the downhole control unit 40 operates autonomously by sensing a preset downhole parameter, (i.e., temperature, pressure, flow, position or other area of interest) and actuating the downhole device 41 .
- a preset downhole parameter i.e., temperature, pressure, flow, position or other area of interest
- a silicone diode temperature switch or a bi-metal thermostat may be used as the sensing device 46 .
- the sensor device 46 Upon sensing a preset temperature, the sensor device 46 switches from an open state to a closed state permitting power from lines 24 to reach the drive circuit 44 and activation (e.g., opening, closing, partially opening or partially closing) of at least one downhole device 41 (or multiple downhole devices) based upon the downhole parameter or event.
- activation e.g., opening, closing, partially opening or partially closing
Abstract
The present invention provides a production well control system for controlling multiple downhole devices individually, or as a group, based upon user command or real time downhole parameters. In accordance with a first embodiment of the present invention, a surface control unit, a downhole control module and an interface unit are provided for selectively controlling multiple downhole devices and transmitting real time data to the surface. An important feature of this invention is the ability to access the multiple devices (e.g., valves) individually, or as a group arranged in a distributed scheme. The number of downhole devices that can be controlled by this apparatus is only limited by the data address sizes, the power delivery capacity or the power consumption requirements. Another embodiment of the invention provides downhole sensors and a control module to automatically control the downhole devices based upon a sensed downhole parameter or event.
Description
- This application claims priority from the USPTO provisional patent application entitled “An Apparatus and Method for Electrically Controlling Multiple Downhole Devices” by Jeffery Lee McDaniel, filed on Jan. 26, 2001, serial No. 60/264,364.
- 1. Field of the Invention
- This invention relates generally to oilfield well operations and more particularly to an apparatus and method for electrically controlling multiple downhole devices.
- 2. Description of the Related Art
- The control of oil and gas production wells constitutes an on-going concern of the petroleum industry due, in part, to the enormous monetary expense involved as well as the risks associated with environmental and safety issues.
- It will be appreciated that relatively simple, timed intermittent operation of valves and the like are often not adequate to control either outflow from the well or injection to the well so as to optimize well production. As a consequence, sophisticated computerized controllers have been positioned at the surface of production wells for control of downhole devices such as motor valves.
- Surface controllers are often hardwired to downhole sensors which transmit information to the surface such as pressure, temperature and flow. This data is then processed at the surface by the computerized control system.
- While it is well recognized that petroleum production wells will have increased production efficiencies and lower operating costs if surface computer based controllers and downhole microprocessor controllers (actuated by external or surface signals) are utilized, current control systems nevertheless suffer from drawbacks and disadvantages. For example, reliability of surface to downhole signal integrity in a surface control system wherein a downhole microprocessor is actuated by a surface signal is a major concern. It will be appreciated that should the surface signal be in any way compromised on its way downhole, then important operations will not take place as needed.
- Prior art surface control systems generally require a surface platform at each well for supporting the control electronics and associated equipment. However, in may instances, the well operator would rather forego building and maintaining a costly platform. Thus, a problem is encountered in that use of present surface controllers require the presence of a location for the control system, namely the platform.
- Disadvantages of present production well control systems involves the extremely high cost associated with implementing changes in well control and related workover operations. Presently, if a problem is detected at the well, the customer is required to send a rig to the wellsite at an extremely high cost (e.g., 5 million dollars for 30 days offshore work). The well must then be shut in during the workover causing a large loss in revenues (e.g., 1.5 million dollars for a 30 day period). Associated with these high costs are the relatively high risks of adverse environmental impact due to spills and other accidents as well as potential liability of personnel at the rig site. Of course, these risks can lead to even further costs. Because of the high costs and risks involved, in general, a customer may delay important and necessary workover of a single well until other wells in that area encounter problems. This delay may cause the production of the well to decrease or be shut in until the rig is brought in.
- The present invention provides a production well control system for controlling multiple downhole devices, preferably, but not limited to, valves, separated by thousands of meters. This system allows for economic, reliable and reversible means of controlling a plurality of downhole devices.
- In accordance with a first embodiment of the present invention, a surface control unit, downhole control module and interface unit are provided for selectively controlling downhole devices. An important feature of this invention is the ability to access individually, or as a group, multiple devices (e.g., valves) arranged in a distributed scheme. The number of downhole devices that can be controlled by this apparatus is only limited by the data address sizes, the power delivered and the power consumed. Additionally, the apparatus is inherently more reliable with each downhole device electrically coupled to an interface unit having a unique, stored address which must correspond to a surface transmitted address before actuation of the downhole device.
- In accordance with a second embodiment of the present invention, comprising downhole sensors, downhole devices and a downhole control module whereby the control module automatically controls the downhole devices based upon a sensed downhole parameter or event. Therefore, using downhole sensors, the downhole control module will monitor actual downhole parameters (e.g., pressure, temperature, flow) and automatically execute control instructions to activate the downhole devices when parameters reach a preset limit or are outside of an optimum operating range.
- In contrast to the first embodiment, well control systems which consist of a control module located wholly at the surface and a downhole computer system which requires an external initiation signal (as well as a surface control system), the downhole well production control system in the second embodiment automatically operates based on downhole conditions sensed in real time without the need for a surface or external signal. This important feature constitutes a significant advance in the field of production well control. Additional advantages of this system include elimination of the need for a surface platform and an even more reliable communication system since no surface to downhole actuation signal is required and the associated risk that such an actuation signal will be compromised is therefore rendered moot.
- A power source provides energy to the downhole control unit in both embodiments described below. Power for the power source can be generated, preferably, at the surface or in the wellbore (e.g., by a turbine generator) or supplied by energy storage devices such as batteries (or a combination of one or more power sources). The power source provides electrical voltage and current to the downhole electronics, electromechanical devices and sensors in the wellbore.
- Examples of the more important features of the invention thus have been summarized rather broadly in order that the detailed description thereof that follows may be better understood, and in order that the contributions to the art may be appreciated. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject of the claims appended hereto.
- For detailed understanding of the present invention, references should be made to the following detailed description of the preferred embodiment, taken in conjunction with the accompanying drawings, in which like elements have been given like numerals and wherein:
- FIG. 1 is a schematic diagram of a production system that employs the apparatus of the present invention;
- FIG. 2 is a block diagram showing an interface unit in accordance with the present invention;
- FIG. 3 is a schematic diagram of the production system that employs an alternative embodiment of the present invention; and
- FIG. 4 is a block diagram showing a control unit of the alternative embodiment.
- FIG. 1 is a schematic diagram of a
production system 10, including aconventional derrick 11. Asurface control unit 12 at the surface allows an operator to generate a command/request to be executed downhole. The operator may request downhole data or actuate one or more downhole devices by inputting a command into a communication terminal and display 16. The command is communicated by wire or wireless to a power and communication system 14. - The power and communication system14 generates a command sequence and sufficient voltage to drive the selected downhole device. Specifically, the power and communication system 14 encodes the operator□s command as a command signal using a synchronized communication technique, preferably Manchester data encoding. The power and communication system 14 also generates a sufficiently high voltage to ensure that the command signal and activation voltage arrive at a
downhole control module 30. The command signal and activation voltage are transmitted from the power and communication system 14 to thedownhole control module 30 via twisted pair wiring housed in armored and shieldedlines 22 extending downward from thesurface 13 into thewellbore 20. - Upon receipt of the command signal and activation voltage, the
downhole control module 30 interprets and reformats the command signal before transmitting a command serial data package and the activation voltage via armored and shieldedlines 23, comprising a bi-directional four wire communication path comprising two wires for communicating power, one wire for communicating a clock pulse and one wire for communicating data.Power lines 24 and communication lines (e.g., clock pulse wire and data wire) 26, shown in FIG. 2, are connected to aninterface unit 40 which is electrically coupled to at least onedownhole device 41, preferably, but not limited to, a valve. Returning to FIG. 1, thedownhole control module 30 may transmit the command signal and activation voltage tomultiple interface units - As shown in FIG. 2, the
interface unit 40, comprises a bi-directional communication transmitter and receiver ortransceiver 42 which receives and transmits the data and clock pulse fromcommunication line 26. The receiver/transmitter ortransceiver 42 allows data to travel bi-directionally through the armored and shieldedwire 23 in a half duplex manner. A programable logic unit 43, within theinterface unit 40, decodes the address and clock and compares the transmitted address in the command serial stream to the local address stored inmemory 45. The local address is either electrically programmed before or after theinterface unit 40 is placed downhole or hardwired into theinterface unit 40 prior to placement downhole. - If the transmitted address in the command serial stream and the stored address in the
interface unit 40 are equivalent, and depending upon the operator Ds command/request, the downholedevice drive circuit 44 will be energized and thedownhole device 41 actuated (i.e., opens, closes, partially opens or closes) or data may be obtained from various downhole sensors including, but not limited to, atemperature sensor 46,pressure sensor 47,fluid sensor 48 and/or downholedevice position sensor 49. This data is then transmitted to thedownhole control module 30 and thesurface control unit 12. - If the transmitted address in the command serial stream does not correspond to the stored address in the
interface unit 40, thebi-directional transceiver 42 transmits the command serial stream to thenext interface unit 50 downstream. Following this transmission, the transmitter portion of thetransceiver 42 is de-energized and the receiver portion is energized. This process continues until the command serial stream reaches the appropriate interface unit containing the identical address as the transmitted address in the command serial stream. - FIG. 3 illustrates an alternative embodiment of the present invention. As in the first embodiment, the alternative embodiment includes a
production system 10 comprising, in part, aconventional derrick 11. However, unlike the first embodiment, the alternative embodiment does not require transmission of surface commands since actuation of the downhole device or group of downhole devices is initiated upon the sensing of a preset downhole parameter (e.g., temperature, pressure, flow or change in position of the downhole device) or event. - Preferably, a
power supply 12 is located at the surface to generate sufficient power to drive adownhole control unit 40 and at least onedownhole device 41. The power from thesupply 12 is transmitted via armored and shieldedlines 22 extending downward from thesurface 13 into thewellbore 20 to thedownhole control unit 40 and at least onedownhole device 41. However, it is contemplated that power for the power supply can be generated in the wellbore (e.g., by a turbine generator) or supplied by energy storage devices such as batteries (or a combination of one or more power sources). - FIG. 4 illustrates a block diagram of the
downhole control unit 40, comprising asensor device 46 and adrive circuit 44. As mentioned above, thedownhole control unit 40 operates autonomously by sensing a preset downhole parameter, (i.e., temperature, pressure, flow, position or other area of interest) and actuating thedownhole device 41. For example, in controlling flow through a valve which is prone to heat up or cool down due to pressure differences on either side of the valve, a silicone diode temperature switch or a bi-metal thermostat may be used as thesensing device 46. Upon sensing a preset temperature, thesensor device 46 switches from an open state to a closed state permitting power fromlines 24 to reach thedrive circuit 44 and activation (e.g., opening, closing, partially opening or partially closing) of at least one downhole device 41 (or multiple downhole devices) based upon the downhole parameter or event. - The foregoing description is directed to particular embodiments of the present invention for the purpose of illustration and explanation. It will be apparent, however, to one skilled in the art that many modifications and changes to the embodiment set forth are possible without departing from the scope and the spirit of the invention. It is intended that the following claims be interpreted to embrace all such modifications and changes.
Claims (3)
1. A system for selective control of at least one downhole device among a plurality of downhole devices, comprising:
(a) a surface control unit for transmitting a command signal and an activation voltage to a selected downhole device among a plurality of downhole devices;
(b) a downhole control module electrically responsive to said surface control unit for receiving, interpreting and reformatting said command signal from said surface control unit, said control module transmitting said reformatted command signal and said activation voltage to at least said selected downhole device; and,
(c) an interface unit electrically coupled to the selected downhole device for receiving said reformatted command signal, energizing the selected downhole device and transmitting downhole data to said downhole control module.
2. A system for selective control of at least one downhole device from among a plurality of downhole devices, said system comprising:
(a) a surface power source for generating an activation voltage for the at least one downhole device; and,
(b) a control unit for sensing at least one downhole condition parameter; said control unit electrically coupled to the one downhole device for activating the one downhole device responsive to a predetermined value of said downhole condition parameter.
3. A method of controlling at least one downhole device, comprising:
(a) transmitting a command signal and activation voltage from a surface control unit;
(b) receiving said command signal and said activation voltage by a downhole control module;
(c) interpreting said command signal by said downhole control module;
(d) reformatting said command signal by said downhole control module;
(e) transmitting said reformatted command signal and said activation voltage to at least one predetermined downhole device among a plurality of downhole devices;
(f) receiving said reformatted command signal at an interface unit electrically coupled to said predetermined downhole device;
(g) actuating the predetermined downhole device in response to said reformatted command; and
(h) transmitting downhole data from said interface unit to said downhole control module and to said surface control unit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/054,005 US20020112860A1 (en) | 2001-01-26 | 2002-01-21 | Apparatus and method for electrically controlling multiple downhole devices |
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US26436401P | 2001-01-26 | 2001-01-26 | |
US10/054,005 US20020112860A1 (en) | 2001-01-26 | 2002-01-21 | Apparatus and method for electrically controlling multiple downhole devices |
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Cited By (13)
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US20030196790A1 (en) * | 2002-04-17 | 2003-10-23 | Powell Steven Robert | Control of hydrocarbon wells |
US20040055749A1 (en) * | 2002-09-23 | 2004-03-25 | Lonnes Steven B. | Remote intervention logic valving method and apparatus |
US20050039923A1 (en) * | 2003-08-21 | 2005-02-24 | Philip Howe | Well control means |
US20060042799A1 (en) * | 2004-09-02 | 2006-03-02 | Veto Gray Inc. | Tubing running equipment for offshore rig with surface blowout preventer |
US20070044959A1 (en) * | 2005-09-01 | 2007-03-01 | Baker Hughes Incorporated | Apparatus and method for evaluating a formation |
US20080158004A1 (en) * | 2006-12-27 | 2008-07-03 | Frederic Latrille | Method and apparatus for downloading while drilling data |
CN101397890A (en) * | 2007-09-28 | 2009-04-01 | 普拉德研究及开发股份有限公司 | Apparatus string for use in a wellbore |
US20090272529A1 (en) * | 2008-04-30 | 2009-11-05 | Halliburton Energy Services, Inc. | System and Method for Selective Activation of Downhole Devices in a Tool String |
US20110140907A1 (en) * | 2008-08-01 | 2011-06-16 | Saber Limited | Downhole communication |
US8496065B2 (en) | 2011-11-29 | 2013-07-30 | Halliburton Energy Services, Inc. | Release assembly for a downhole tool string |
US8540021B2 (en) * | 2011-11-29 | 2013-09-24 | Halliburton Energy Services, Inc. | Release assembly for a downhole tool string and method for use thereof |
US8649909B1 (en) * | 2012-12-07 | 2014-02-11 | Amplisine Labs, LLC | Remote control of fluid-handling devices |
US8725302B2 (en) * | 2011-10-21 | 2014-05-13 | Schlumberger Technology Corporation | Control systems and methods for subsea activities |
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FR2850129B1 (en) * | 2003-01-22 | 2007-01-12 | CONTROL INSTALLATION FOR AUTOMATED WELL BASE TOOLS. | |
NO320173B1 (en) * | 2004-04-22 | 2005-11-07 | Rune Freyer | Method and apparatus for controlling a fluid flow between the outside and inside of a source tube |
US8596359B2 (en) * | 2010-10-19 | 2013-12-03 | Halliburton Energy Services, Inc. | Remotely controllable fluid flow control assembly |
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US4798247A (en) * | 1987-07-15 | 1989-01-17 | Otis Engineering Corporation | Solenoid operated safety valve and submersible pump system |
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2002
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- 2002-01-23 AU AU13531/02A patent/AU1353102A/en not_active Abandoned
- 2002-01-25 NO NO20020410A patent/NO20020410L/en not_active Application Discontinuation
- 2002-01-25 GB GB0201644A patent/GB2371577A/en not_active Withdrawn
- 2002-01-25 CA CA002369380A patent/CA2369380A1/en not_active Abandoned
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US20030196790A1 (en) * | 2002-04-17 | 2003-10-23 | Powell Steven Robert | Control of hydrocarbon wells |
US20040055749A1 (en) * | 2002-09-23 | 2004-03-25 | Lonnes Steven B. | Remote intervention logic valving method and apparatus |
US7516792B2 (en) * | 2002-09-23 | 2009-04-14 | Exxonmobil Upstream Research Company | Remote intervention logic valving method and apparatus |
US20050039923A1 (en) * | 2003-08-21 | 2005-02-24 | Philip Howe | Well control means |
US7513308B2 (en) * | 2004-09-02 | 2009-04-07 | Vetco Gray Inc. | Tubing running equipment for offshore rig with surface blowout preventer |
US20060042799A1 (en) * | 2004-09-02 | 2006-03-02 | Veto Gray Inc. | Tubing running equipment for offshore rig with surface blowout preventer |
US20060042791A1 (en) * | 2004-09-02 | 2006-03-02 | Stanley Hosie | Tubing running equipment for offshore rig with surface blowout preventer |
US7318480B2 (en) * | 2004-09-02 | 2008-01-15 | Vetco Gray Inc. | Tubing running equipment for offshore rig with surface blowout preventer |
US20070044959A1 (en) * | 2005-09-01 | 2007-03-01 | Baker Hughes Incorporated | Apparatus and method for evaluating a formation |
US20080158004A1 (en) * | 2006-12-27 | 2008-07-03 | Frederic Latrille | Method and apparatus for downloading while drilling data |
US8157022B2 (en) * | 2007-09-28 | 2012-04-17 | Schlumberger Technology Corporation | Apparatus string for use in a wellbore |
CN101397890A (en) * | 2007-09-28 | 2009-04-01 | 普拉德研究及开发股份有限公司 | Apparatus string for use in a wellbore |
US20090084535A1 (en) * | 2007-09-28 | 2009-04-02 | Schlumberger Technology Corporation | Apparatus string for use in a wellbore |
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Also Published As
Publication number | Publication date |
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GB0201644D0 (en) | 2002-03-13 |
CA2369380A1 (en) | 2002-07-26 |
NO20020410D0 (en) | 2002-01-25 |
GB2371577A (en) | 2002-07-31 |
AU1353102A (en) | 2002-08-01 |
NO20020410L (en) | 2002-07-29 |
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