WO2016156851A2 - Outil en profondeur de puits - Google Patents

Outil en profondeur de puits Download PDF

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Publication number
WO2016156851A2
WO2016156851A2 PCT/GB2016/050906 GB2016050906W WO2016156851A2 WO 2016156851 A2 WO2016156851 A2 WO 2016156851A2 GB 2016050906 W GB2016050906 W GB 2016050906W WO 2016156851 A2 WO2016156851 A2 WO 2016156851A2
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic lock
valve
control system
downhole tool
hydraulic
Prior art date
Application number
PCT/GB2016/050906
Other languages
English (en)
Other versions
WO2016156851A3 (fr
Inventor
Michael Wardley
Neil Andrew Simpson
Original Assignee
Michael Wardley
Neil Andrew Simpson
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Michael Wardley, Neil Andrew Simpson filed Critical Michael Wardley
Priority to US15/563,745 priority Critical patent/US20180094495A1/en
Priority to EP16725194.1A priority patent/EP3277912A2/fr
Publication of WO2016156851A2 publication Critical patent/WO2016156851A2/fr
Publication of WO2016156851A3 publication Critical patent/WO2016156851A3/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/08—Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems
    • E21B23/10—Tools specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/04—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion

Definitions

  • the present invention relates to downhole tools used in the oil industry.
  • downhole tools which are activated by remote control for example by sending a pressure signal from the surface to the downhole tool.
  • remote control for example by sending a pressure signal from the surface to the downhole tool.
  • This can be achieved in numerous ways with a variety of actuation arrangements, the most common of which is the use of hydraulic pressure generated in the fluid pumped down the hole through the drilling or production tubular.
  • the pressure of a pumped fluid through a nozzle can be used to apply a force to an actuation member e.g. a piston which in turn activates a downhole tool.
  • these tools may be an expandable underreamer, expandable casing mill, side port circulating tool or similar device.
  • fluid circulation is required for other purposes such as in the actual drilling operation it is important that the actuation mechanism or arrangement is selective and can differentiate between fluid flow that is required to activate the device and fluid flow that is required for the drilling operation.
  • actuation mechanism or arrangement is selective and can differentiate between fluid flow that is required to activate the device and fluid flow that is required for the drilling operation.
  • the use of a threshold pressure which is above that required for normal drilling operations acting on a spring loaded piston.
  • the tool or device will operate whenever the threshold pressure is exceeded and is sufficient to overcome the strength of the return spring.
  • This simple approach though effective in some applications has a number of disadvantages, namely: ⁇ there may not be a positive indication at the surface that the activation has taken place;
  • the activation may not be a positive action but happen slowly or partially unless shear pins are employed to ensure that the increased pressure is applied above that required to overcome the spring return force;
  • the activation may only be partial due to seal friction and or other factors such as the ingress of mud solids into the moving parts of the system;
  • An alternative actuation arrangement involves the use of a drop ball pumped down from surface onto a ball seat in the piston. This actuation arrangement will overcome some of the above disadvantages but introduces others such as: ⁇ introducing a undesirable restriction into the flow path which could obstruct flow or the passage of other tools;
  • RFID tag Radio Frequency Identification Devices
  • RFID tags still suffer the time delay disadvantages of a drop ball system in that they require time to reach the downhole tool.
  • a drop ball actuation arrangement may even be preferable, since if flow cannot be established the ball can still fall under its own weight, whereas the RFID tag cannot.
  • international patent application WO 2014/009756 teaches a system wherein a hydraulic lock positioned in the tubular string can make use of a pre- programmed surface signal, such as multiple pump operations to activate a downhole tool.
  • the disclosed hydraulic lock comprises an actuator in the form of a logic controlled valve.
  • the logic controlled valve acts to release the lock when it recognises a pre-programmed signal which could be pressure, rotation or linear translation for instance. After a pre- programmed time the actuator arrangement may re-imposes the hydraulic lock thereby locking the downhole tool in the activated position. In order to de-activate the tool the signal is again sent to the logic controlled valve actuator arrangement. This sequence can be repeated a large number of times.
  • the advantages of the above system include; real-time operation in that there is no reliance on pump down objects, no restriction in the flow path which may obstruct future operations, large number of repeatable operations and pre-programmable to look for a signal appropriate to the particular operation.
  • a hydraulic lock for locking the position of an actuation member of a downhole tool relative to the body of the downhole tool comprising:
  • first fluid conduit that provides a means for fluid communication between the first and second chambers
  • a first logic controlled valve located within the first fluid conduit and moveable between an open configuration and a closed configuration to selectively permit fluid communication between the first and second chambers;
  • the hydraulic lock further comprises a secondary control mechanism that provides a second means to selectively permit fluid communication between the first and second chambers. Incorporating a secondary control mechanism within the hydraulic lock provides a means for increasing the reliability and working lifetime of the hydraulic lock. It also provides a means for reducing the risk of unintentional or false activation of the hydraulic lock and thus any actuation member to which it is connected.
  • the first logic controlled valve preferably comprises a first valve controlled by a first valve control system.
  • the valve may comprise a solenoid valve, an electro-mechanical valve or a hydraulic valve.
  • the first valve control system preferably comprises a first valve controller that provides a means for opening and closing the first valve.
  • the first valve control system may further comprise one or more sensors configured to detect an activation event.
  • the first valve control system further comprises a first logic module that communicates with the one or more sensors and the first valve controller.
  • the first logic module checks the signal against a pre-programmed set of conditions, and if fulfilled, instructs the first valve controller to open or close the first valve depending on the nature of the signal.
  • the first valve control system further comprises a battery pack to supply power to one or more of the one or more sensors, the first logic module and the first valve controller.
  • the one or more sensors comprise a first pressure sensor arranged to measure a pressure within the downhole tool and a second pressure sensor arranged to measure a pressure outside of the downhole tool.
  • the one or more sensors comprise a motion sensor (e.g. accelerometers or gyroscopes ) arranged to detect a motion within the downhole tool.
  • the secondary control mechanism comprises a second fluid conduit that provides a second means for fluid communication between the first and second chambers.
  • the secondary control mechanism may comprise a second logic controlled valve located within the second fluid conduit and moveable between an open configuration and a closed configuration to selectively permit fluid communication between the first and second chambers.
  • the first and second logic control valves are effectively located in parallel between the first and second chambers and so the hydraulic lock unlocks if either the first or second logic controlled valves are moved to their open configurations.
  • the second logic controlled valve preferably comprises a second valve controlled by a second valve control system.
  • the second valve may comprise a solenoid valve, an electro-mechanical valve or a hydraulic valve.
  • the second valve control system preferably comprises a second valve controller that provides a means for opening and closing the second valve.
  • the second valve control system may further comprise one or more sensors configured to detect an activation event.
  • the second valve control system further comprises a second logic module that communicates with the one or more sensors and the second valve controller.
  • the second valve control system further comprises a battery pack to supply power to one or more of the one or more sensors, the second logic module and the second valve controller.
  • the one or more sensors comprise a first pressure sensor arranged to measure a pressure within the downhole tool and a second pressure sensor arranged to measure a pressure outside of the downhole tool.
  • the one or more sensors comprise a motion sensor (e.g. accelerometers or gyroscopes ) arranged to detect a motion within the downhole tool.
  • the one or more sensors of the second valve control system are of a different type to the one or more sensors of the first valve control system.
  • the secondary control mechanism may comprise one or more pressure relief devices located within the second fluid conduit.
  • the one or more pressure relief devices comprise one or more burst discs. Activation of the one or more pressure relief devices provides a secondary means of releasing the actuation member and thereby returning the downhole tool to its original configuration in the event of complete failure of the first logic controlled valve.
  • the secondary control mechanism comprises a third logic controlled valve located within the first fluid conduit.
  • the first and third logic control valves are effectively located in series between the first and second fluid chambers and so the hydraulic lock only unlocks if both the first and third logic controlled valves are moved to their open configurations.
  • the third logic controlled valve preferably comprises a third valve controlled by a third valve control system.
  • the third valve may comprise a solenoid valve, an electro- mechanical valve or a hydraulic valve.
  • the third valve control system preferably comprises a third valve controller that provides a means for opening and closing the third valve.
  • the third valve control system may further comprise one or more sensors configured to detect an activation event.
  • the third valve control system further comprises a third logic module that communicates with the one or more sensors and the third valve controller.
  • the third valve control system further comprises a battery pack to supply power to one or more of the one or more sensors, the third logic module and the third valve controller.
  • the one or more sensors comprise a first pressure sensor arranged to measure a pressure within the downhole tool and a second pressure sensor arranged to measure a pressure in the outside of the downhole tool.
  • the one or more sensors comprise a motion sensor (e.g. accelerometers or gyroscopes ) arranged to detect a motion within the downhole tool.
  • the one or more sensors of the third valve control system are of a different type to the one or more sensors of the first valve control system.
  • the secondary control mechanism comprises a timer unit connected to the first logic controlled valve the timer unit providing a means for automatically unlocking the hydraulic lock.
  • the timer unit automatically unlocks the hydraulic lock at predetermined periodic intervals.
  • the secondary control mechanism comprises a piercing tool having a bore and one or more piercing elements wherein the one or more piercing elements are located adjacent to the first and or second fluid chambers.
  • the piercing tool comprises two piercing elements one of which is located adjacent to the first fluid chamber and the other is located adjacent to the second fluid chamber.
  • the one or more piercing elements are activated in response to a predetermined pressure within the bore.
  • an actuation member moveable relative to the body
  • an actuation arrangement configured to move the actuation member relative to the body; and a hydraulic lock in accordance with the first aspect of the present invention, wherein the hydraulic lock is configured in a first configuration to permit movement of the actuation member by the actuation arrangement and configured in a second configuration to provide a fluid lock across the actuation member which prevents movement of the actuation member by the actuation arrangement.
  • Embodiments of the second aspect of the invention may comprise features to implement the preferred or optional features of the first aspect of the invention or vice versa.
  • a method for increasing the reliability of a hydraulic lock comprising: a first fluid chamber; a second fluid chamber; a first fluid conduit that provides a means for fluid communication between the first and second chambers and a first logic controlled valve located within the first fluid conduit and moveable between an open configuration and a closed configuration to selectively permit fluid communication between the first and second chambers; the method comprising providing the hydraulic lock with a secondary control mechanism that provides a second means to selectively permit fluid communication between the first and second chambers.
  • providing the hydraulic lock with a secondary control mechanism comprises providing a second means for fluid communication between the first and second chambers.
  • Providing the hydraulic lock with a secondary control mechanism may further comprise providing a second logic controlled valve moveable between an open configuration and a closed configuration within the second fluid conduit.
  • Providing the hydraulic lock with a secondary control mechanism may further comprise providing one or more pressure relief devices within the second fluid conduit.
  • Providing the hydraulic lock with a secondary control mechanism may further comprise providing a third logic controlled valve moveable between an open configuration and a closed configuration within the first fluid conduit.
  • Providing the hydraulic lock with a secondary control mechanism may further comprise providing a means to automatically unlock the hydraulic lock. The hydraulic lock may be automatically unlocked at predetermined periodic intervals.
  • Providing the hydraulic lock with a secondary control mechanism may further comprise locating one or more piercing elements adjacent to the first and or second fluid chambers.
  • the method further comprises providing a predetermined pressure to activating the one or more piercing elements.
  • Embodiments of the third aspect of the invention may comprise features to implement the preferred or optional features of the first or second aspects of the invention or vice versa.
  • a downhole tool comprising a switchable hydraulic lock as the means of controlling actuation and a plurality of independent control mechanisms, any one of which can be independently operated to control the tool.
  • the downhole tool comprises two independent control mechanisms.
  • a downhole tool comprising a switchable hydraulic lock as the means of controlling actuation and a plurality of independent control mechanisms, a plurality of which are required to be operated to control the tool.
  • the downhole tool comprises two independent control mechanisms
  • a downhole tool comprising a switchable hydraulic lock as the means of controlling actuation and a time- based automatic reset for unlocking the hydraulic lock.
  • a downhole tool comprising a switchable hydraulic lock as the means of controlling actuation and a pressure activated device for unlocking the hydraulic lock.
  • a downhole tool comprising a switchable hydraulic lock as the means of controlling actuation and a means of permanently disabling the hydraulic lock.
  • a downhole tool comprising a switchable hydraulic lock as the means of controlling actuation and a means of permanently disabling the hydraulic lock wherein the permanent disabling means comprises a further downhole tool able to rupture the walls of the hydraulic chambers of the hydraulic lock.
  • Embodiments of the fourth to ninth aspects of the invention may comprise features to implement the preferred or optional features of the first to third aspects of the invention or vice versa.
  • Figure 1 presents a longitudinal section view of a downhole tool incorporating a hydraulic lock as known in the art, shown in a retracted configuration
  • Figure 2 presents a longitudinal section view of the downhole tool of Figure 1 shown in an extended configuration
  • Figure 3 presents a section view of the hydraulic lock of the downhole tool of Figure 1
  • Figure 4 (a) presents a section view of a hydraulic lock in accordance with an embodiment of the present invention while Figure 4(b) presents a schematic view of a control system module for the hydraulic lock
  • Figure 5 presents a section view of a hydraulic lock in accordance with an alternative embodiment of the present invention
  • Figure 6 presents a section view of a hydraulic lock in accordance with an alternative embodiment of the present invention
  • Figure 7 presents a section view of a hydraulic lock in accordance with an alternative embodiment of the present invention
  • Figure 8 presents a section view of a hydraulic lock in accordance with an alternative embodiment of the present invention
  • Figure 1 presents a longitudinal section view of a downhole tool incorporating a hydraulic lock as known in the art,
  • Figure 1 presents a longitudinal section view of a downhole tool 10 disclosed with within international patent application WO 2014/009756 in a retracted configuration while Figure 2 present the downhole tool 10 in an extended configuration.
  • the downhole tool 10 can be seen to comprise an actuation member in the form of a piston 1 positioned and moveable within a bore 16 of an annular body 2 and sealed therein with sealing elements 3a, 3b and 4.
  • the downhole tool 10 further comprises an actuating piston 46 and, in use, the actuating piston 46 forms an actuation arrangement for the tool 10.
  • the actuating piston 46 includes a separate component coupled to an upper end of the annular body 2, although the actuating piston 46 could alternatively be formed by the body 2.
  • the actuating piston 46 sealingly engages with the body 2 and has an upper end face 48 which is exposed to flow and pressure in the bore 16 and a lower end face 58 which is exposed to annulus flow and pressure via a port 52 in the body 2.
  • differential pressure acting across the larger area of the upper end face 48 of the actuating piston 46 urges the actuating piston 46 and the piston 1 towards the extended configuration as shown in Figure 2.
  • the downhole tool 10 also comprises a hydraulic lock 20, further details of which are presented in Figure 3.
  • the hydraulic lock can be seen to comprise fluid chambers 5a and 5b that are filled with hydraulic fluid; a hydraulic line 6a and 6b that connects fluid chambers 5a and 5b; and a logic controlled valve 7, for example a solenoid valve, placed in the hydraulic line 6a and 6b.
  • Hydraulic fluid chamber 5a is sealed by seals 3b and 4 while hydraulic fluid chamber 5b is sealed by seals 3a and 4.
  • the hydraulic line 6a runs from hydraulic fluid chamber 5a to the solenoid valve 7 while the hydraulic line 6b runs from the solenoid valve 7 to the hydraulic fluid chamber 5b.
  • a control system 8 which may comprise a power supply, sensors and appropriate electronic circuitry provide logic control for the valve 7 i.e. control whether the valve 7 is open or closed.
  • the power supply may be batteries and the sensors may be pressure transducers or accelerometers or gyroscopes for instance.
  • the electronic circuitry checks the signal against a pre-programmed set of conditions, which if fulfilled, allows the valve 7 to open or close depending on the nature of the signal thus moving the downhole tool 10 between the retracted configuration of Figure 1 and the extended configuration of Figure 2.
  • FIG 4(a) presents a section view of a hydraulic lock 40 in accordance with a first embodiment of the present invention.
  • the hydraulic lock 40 comprises first 20a and second locks 20b connected in parallel between the hydraulic chambers 5a and 5b.
  • the arrangement of hydraulic lines 6 and control system 8 is effectively duplicated.
  • Solenoid valve 7a is connected to the hydraulic chambers 5a and 5b by hydraulic lines 6a and 6b.
  • Solenoid valve 7b is connected to the hydraulic chambers 5a and 5b by hydraulic lines 6c and 6d.
  • Each control system 8a and 8b comprises a control system module 42 as presented in Figure 4(b).
  • the control system module 42 can be seen to comprise a first pressure transducer 44a arranged to communicate with pressure in the bore 16 and a second pressure transducer 44b arranged to communicate with pressure in the annulus.
  • the control system module 42 further comprises a transducer logic module 45 that communicates with the first and second pressure transducers 44a and 44b and a solenoid valve controller 47.
  • the solenoid valve controller 47 controls the respective valve 7a or 7b.
  • a battery pack 49 is also provided to supply power to the transducer logic module 45 and the solenoid valve controller 47.
  • the control system module 42 may be configured to receive the activation event.
  • the control system module 42 may additionally be configured to transmit information to and or receive information the surface.
  • the hydraulic lock 40 unlocks if either control system 8a or 8b operates its respective solenoid valve 7a or 7b.
  • the primary control system 8a and secondary control system 8b may be identical as described above. It may be preferable for the secondary control system 8b to comprise different types of sensors to that of the primary control system 8a. For instance, if the primary control system 8a comprises pressure transducers 44a and 44b, the secondary control system 8b may comprise accelerometers. It is of course a simple matter to contemplate adding a tertiary control system, which would provide even greater reliability.
  • the hydraulic lock 40 may comprise more than two hydraulic locks connected in parallel between the hydraulic chambers 5a and 5b.
  • the second hydraulic lock 20b of the above described hydraulic lock 40 provides a secondary control mechanism that acts as backup arrangement partially or completely independent of the primary lock 20a.
  • the primary control system 8a may comprise pressure transducers programmed to look for a pre-determined sequence of pressure signals. Should this system fail, say through malfunction of the control system 8a electronics, there is provided a backup system, a secondary lock 20b, with an independent power supply, the control system 8b of which may for instance comprise accelerometers programmed to look for a pre-determined sequence of rotational operations, say 100 rotations of the drill string followed by one minute with no rotations followed by a further 100 rotations.
  • FIG. 5 presents a section view of a hydraulic lock 50 in accordance with a second embodiment of the present invention.
  • the hydraulic lock 50 comprises first 20c and second locks 20d connected in series between the hydraulic chambers 5a and 5b.
  • Solenoid valve 7c is connected to the hydraulic chambers 5a by hydraulic line 6e.
  • Solenoid valve 7d is connected to the hydraulic chamber 5b by hydraulic line 6g.
  • a hydraulic line 6f connects the two solenoid valves 7c and 7d.
  • the first control system 8c is employed to control solenoid valve 7c, while the second control system 8d is employed to control the other solenoid valve 7d.
  • both control systems 8c and 8d are required to operate their respective solenoid valve 7c and 7d for the hydraulic lock 50 to be unlocked. It is of course a simple matter to contemplate adding a tertiary control system, which would provide even greater reliability.
  • the hydraulic lock 50 may comprise more than two hydraulic locks 20 connected in series between the hydraulic chambers 5a and 5b.
  • the second hydraulic lock 20d of the above described hydraulic lock 50 again provides a secondary control mechanism that acts as backup arrangement partially or completely independent of the primary lock 20c. However, in this embodiment the two systems 20c and 20d are arranged in sequence.
  • FIG. 6 presents a section view of a hydraulic lock 60 in accordance with a third embodiment of the present invention.
  • the hydraulic lock 60 comprises a pre-programmed timer 9 connected to the control system 8e.
  • the function of the timer 9 is to instruct the control system 8e to open the valve 7e after a predetermined time has elapsed since the last valve opening instruction was sent. The period may for instance be two hours.
  • the pre-programmed timer 9 of the above described hydraulic lock 60 again provides a secondary control mechanism that acts as backup arrangement partially or completely independent of the primary lock 20e.
  • the pre-programmed timer 9 may be programmed to automatically open the hydraulic lock 60 to allow the downhole tool 10 to be reset to its the original configuration at periodical intervals.
  • FIG. 7 presents a section view of a hydraulic lock 70 in accordance with a fourth embodiment of the present invention.
  • the hydraulic lock 70 comprises one or more pressure relief devices 110 in the form of one or more burst discs connected in parallel with a primary lock 20f to hydraulic chambers 5a and 5b by hydraulic lines 6h and 6j.
  • the burst discs 1 10 therefore provides a secondary means of releasing the actuator piston 1 and thereby returning the downhole tool 10 to its original configuration in the event of complete failure of the control system 8f or the solenoid valve 7f.
  • An example of a situation where this might be desirable could again be the case of the underreamer described in the third embodiment above.
  • a dart may be pumped down the bore 16 of the downhole tool 10 to land on a seat below the hydraulic lock 70 and pressure would be applied to burst the one or more burst discs 1 10 and thereby release the hydraulic lock 70.
  • the burst discs 1 10 rupture pressure would be set at a pressure considerably above any pressure normally seen in the operation of the downhole tool 10 in order to avoid accidental rupturing.
  • FIG 8 presents a section view of a hydraulic lock 80 in accordance with a fifth embodiment of the present invention.
  • the hydraulic lock 80 comprises a piercing tool 12 having piercing elements 15a and 15b.
  • the piecing tool 12 is run down the drill string (not shown) and located in the actuator piston 1 such that the piercing elements 15a and 15b are located adjacent to hydraulic chambers 5a and 5b, respectively.
  • Applying high pressure to the bore 14 of the piercing tool 12 causes piercing elements 15a and 15b to extend and rupture the walls of the actuator piston 1 at points 17a and 17b.
  • the ruptures allow fluid communication between hydraulic chambers 5a and 5b as both effectively evacuate into bore 16 of annular body 2, thereby allowing the downhole tool 10 to be reset.
  • the piecing tool 12 of the above described hydraulic lock 80 again provides a secondary control mechanism that acts as backup arrangement partially or completely independent of the primary lock 20g.
  • This specially designed tool is initially lowered into the actuator piston 1 and thereafter pressure is applied to cause the tool 12 to rupture the wall of the actuator piston 1 thereby releasing the hydraulic lock 80 and allowing the actuator piston 1 to retract to its non-actuated position e.g. by spring return.
  • the piecing tool 12 may comprise a single piercing element 15a.
  • a single piercing element 15a should be located adjacent to in order to release the hydraulic lock 80 and allow the actuator piston 1 to retract to its non-actuated position.
  • a second single piercing element 15a piecing tool 12 may be required in order to rupture and evacuate the other hydraulic chambers 5a or 5b.
  • the variation of the piecing tool 12 could be arranges to locate within a groove in the actuator piston 1. After rupturing the wall of the actuator piston 1 , an upward pull would lift the actuator piston 1 to its non-actuated position without the need to rely on a spring return force.
  • a downhole tool comprising an actuation member in the form of a piston.
  • the actuation member could be employed to perform a range of downhole operations. Any suitable means for engaging the associated downhole tool or device to be controlled may be utilised.
  • the actuation member of the downhole tool could be configured for direct attachment to, or otherwise configured to directly engage, the actuation mechanism or systems of the tool or device to be controlled.
  • the actuation member of the downhole tool may be utilised with a biasing piston or the like to move a sliding sleeve or other type of valve system to allow drill string pressure to act on the actuation piston or operating components of the tool or device to be controlled.
  • the actuation member of the downhole tool may be used with a biasing piston or the like to release and or re- apply a mechanical sear or trigger mechanism to pull a supporting sleeve from a finger collet type locking system or the like.
  • Embodiments of the present invention may provide a downhole tool for selectively actuating or operating an associated downhole tool or device and which is simple, reliable, is capable of real time activation, is selectively isolated from normal pumping flow and pressure requirements, and which permits the passage of further downhole tools, devices or equipment through the tool and does not require additional elements such as balls, darts or RFID tags to be pumped from surface to operate.
  • Providing a selective fluid lock across the actuation member permits the actuation member to be locked or held in place at any required position or stage of operation and for any required time interval. Since the actuation member is incapable of movement while the fluid lock is in place, the tool can be isolated from pressures, such as normal pumping flow and other pressure events, or other forces in the bore which may otherwise act on the actuation member.
  • the hydraulic locks can be configured to retain the actuation member in the retracted configuration, the extended configuration or in one or more intermediate position between the retracted configuration and the extended configuration.
  • the hydraulic locks lock may be separate from and/or isolated from the actuation arrangement.
  • the described hydraulic locks may comprise a closed fluid system.
  • first fluid chamber 5a and the second fluid chamber 5b may be configured to receive a fluid which may include a hydraulic fluid, such as hydraulic oil or other suitable fluid.
  • a fluid which may include a hydraulic fluid, such as hydraulic oil or other suitable fluid.
  • Providing a substantially incompressible fluid in a closed fluid system permits the fluid lock to be created across the actuation member in use.
  • the above described valve may be of any suitable alternative form and construction e.g. an electro-mechanical valve or a pilot valve.
  • the described downhole tool may form part of a downhole tool string.
  • a connection arrangement may be provided for coupling the downhole tool to other components of the tool string.
  • the connection arrangement may include threaded connectors, such as a threaded box and pin connectors
  • the present invention provides a remotely actuated downhole tool comprising a switchable hydraulic lock as the means of controlling actuation, wherein secondary means of control is also incorporated within the hydraulic lock in order to improve the reliability of the actuator or to allow it to perform operations requiring a 'dual key' system of control.
  • a hydraulic lock for locking the position of an actuation member of a downhole tool relative to the body of the downhole tool is described.
  • the hydraulic lock comprises first and second fluid chambers, fluid communication between which is provided by a first fluid conduit.
  • the hydraulic lock Located with the first fluid conduit is a first logic controlled valve that is moveable between an open configuration and a closed configuration to selectively permit fluid communication between the first and second chambers.
  • the hydraulic lock further comprises a secondary control mechanism that provides a second means to selectively permit fluid communication between the first and second chambers. Incorporating the secondary control mechanism within the hydraulic lock provides a means for increasing the reliability and working lifetime of the hydraulic lock. It also provides a means for reducing the risk of unintentional or false activation of the hydraulic lock.

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Abstract

La présente invention concerne un verrouillage hydraulique pour verrouiller la position d'un élément d'actionnement d'un outil en profondeur de puits par rapport au corps de l'outil en profondeur de puits. Le verrouillage hydraulique comprend des première et seconde chambres fluidiques, la communication fluidique entre ces chambres est fournie par un premier conduit fluidique. Situé conjointement avec le premier conduit fluidique est une première soupape à commande logique qui est mobile entre une configuration ouverte et une configuration fermée pour sélectivement permettre la communication fluidique entre les première et seconde chambres. Le verrouillage hydraulique comprend en outre un mécanisme de commande secondaire qui fournit un second moyen pour permettre sélectivement la communication fluidique entre les première et seconde chambres. L'incorporation du mécanisme de commande secondaire dans le verrouillage hydraulique fournit un moyen pour augmenter la fiabilité et la durée de vie active du verrouillage hydraulique. Elle fournit également un moyen pour réduire le risque d'activation involontaire ou fausse du verrouillage hydraulique.
PCT/GB2016/050906 2015-04-02 2016-03-31 Outil en profondeur de puits WO2016156851A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US15/563,745 US20180094495A1 (en) 2015-04-02 2016-03-31 Downhole tool
EP16725194.1A EP3277912A2 (fr) 2015-04-02 2016-03-31 Outil en profondeur de puits

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1505716.9A GB201505716D0 (en) 2015-04-02 2015-04-02 Specification for downhole tool
GB1505716.9 2015-04-02

Publications (2)

Publication Number Publication Date
WO2016156851A2 true WO2016156851A2 (fr) 2016-10-06
WO2016156851A3 WO2016156851A3 (fr) 2016-11-17

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GB201505716D0 (en) 2015-05-20
EP3277912A2 (fr) 2018-02-07
WO2016156851A3 (fr) 2016-11-17
US20180094495A1 (en) 2018-04-05

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