Downhole tractor and drive system 机翻标题: 暂无翻译,请尝试点击翻译按钮。

公开号/公开日
WO2017029606 A1 2017-02-23 [WO201729606] / 2017-02-23
申请号/申请日
2016WO-IB54904 / 2016-08-16
发明人
AUSTIN IAN;
申请人
GLOBAL TECHNOLOGY & INNOVATION;
主分类号
IPC分类号
E21B-004/00E21B-004/02E21B-023/00E21B-023/14
摘要
(WO201729606) This invention relates to a downhole tractor drive system, suitable for use in oil well interventions.  The invention provides an improved tractor whose speed is controllable remotely, such as from the well bore surface, using hydraulic media pumped to vary the speed of the tractor.  The tractor comprises a stator (60) which has a helical profile.  Surrounding the stator is a commutator (671) which is connected to a flexible jacket (672) which has a helical profile of an opposite sense to the stator helical profile.  A fluid pathway (12) is defined between the stator helical profile and the helical profile of the flexible jacket, through which fluid flows causing the flexible jacket (672) to deform.  As this occurs the jacket adopts the helical profile of the stator so converting a force delivered by the fluid to a rotational force which provides forward drive with respect to the stator.
机翻摘要
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地址
代理人
代理机构
;
优先权号
2015GB-0014696 2015-08-19 2016GB-0000542 2016-01-12
主权利要求
(WO201729606) Claims   1 .  A downhole tractor comprises: a stator which is surrounded by a commutator, a drive system rotates the commutator with respect to the stator; and a well bore engagement means is connected to the commutator, the well bore engagement means engages with a well bore or well liner by way of a plurality of engagement devices supported thereon, the engagement devices, in use, traversing the well bore or liner thereby driving the tractor in a forwards or a reverse direction.    2.  A downhole tractor according to Claim 1 wherein the drive system includes a stator which has a stator helical profile and connected to the commutator is a flexible jacket which has a helical profile of an opposite sense to the stator helical profile, a fluid pathway is defined between the stator helical profile and the helical profile of the flexible jacket, through which pathway a hydraulic fluid flows so as to cause the flexible jacket to deform and adopt the helical profile of the stator, thereby converting a force delivered by the fluid to a torsional force, so as to rotate the commutator with respect to the stator.    3.  A downhole tractor according to Claim 2 wherein the jacket is formed from an elastomer material.    4.  A downhole tractor according to Claim 2 or 3 wherein the jacket includes a reinforcing material.    5.  A downhole tractor according to Claim 4 wherein the reinforcing material includes a mesh of high strength flexible material, such as Kevlar (Trade Mark).  6. A downhole tractor according to any of Claims 2 to 5 wherein a lubricant is provided between the jacket and at least one surface.    7.  A downhole tractor according to Claim 6 wherein the lubricant includes a wear resistant lubricant, such as molybdenum.    8.  A downhole tractor according to any of Claims 2 to 7 wherein the tractor has at least one helical profile and at least one flexible jacket is connected to an external tractor rotor housing.    9.  A downhole tractor according to any of Claims 2 to 8 includes an expander assembly that is arranged around and attached to a rotor casing of the tractor and comprises a mandrel (shaft) having first and second opposing threaded portions arranged coaxially, each portion is housed in an expander follower, in use, the mandrel rotates in a first sense, and first and second expander followers are driven apart one from another; and the mandrel rotates in the opposite sense the first and second expander followers are driven towards one another.    10.  A downhole tractor according to Claim 9 wherein drive bows are connected to each rotor casing by way of a drive bow carrier assembly.    1 1 .  A downhole tractor according to Claim 10 wherein the drive bows are connected to a drive bow carrier assembly by way of a hinged connector and each drive arm is connected to each rotor casing by way of a hinged connector.    12. A downhole tractor according to Claim 1 1 wherein the drive bows or drive arms support the well bore engagement means which includes a drive engagement slip.    13.  A downhole tractor according to Claim 12 wherein a spring, such as a leaf spring, is connected to the drive bows or drive arms and supports the drive engagement slip.    14.  A downhole tractor according to any of Claims 10 to 13 wherein a retraction means acts to retract the drive arms when torque is removed from the mandrel with respect to the rotor casings.    15.  A downhole tractor assembly according to any of Claims 10 to 14, wherein three drive bows or drive arms are located on the outer tractor casing at approximately 120Q one to another.    16.  A downhole tractor assembly according to Claim 15 wherein an automatic take up means is provided so that, in use, well bore variation is accommodated by ensuring expander assemblies move apart or towards one another in dependence upon respective decrease or increase in well bore diameter.    17.  A downhole tractor assembly according to either Claim 15 or 16 includes a drive reverse means for reversing the direction of travel.    18.  A downhole tractor assembly according to any of Claims 15 to 17 includes first and second stators connected one to another and a planetary gear arrangeme nt is located intermediate the first and second stators.    19.  A downhole tractor assembly according to any of Claims 15 to 1 8, wherein the downhole tractor includes an overpull direction control valve, operated by surface applied overpull employs a means to reverse the direction of travel of the tractor.  20.  A downhole tractor assembly according to any of Claims 15 to 19 includes a through connection for a logging tool power and a signal cable via a coiled tubing.  21 .  A tractor according to Claim 1 characterised in that the engagement devices comprise caterpillar tracks or belts.    22.  A tractor according to Claim 1 characterised in that drive is transmitted to the engagement devices by way of belts which transmit drive to a plurality of wheels in contact with the well bore or liner.    23.  A tractor according to Claim 22 characterised in that the wheels are disposed between the commutator and the well wall or liner, the axles of the wheels and axes of the engagement wheels, caterpillar tracks and/or belts being arranged to traverse a helical path along the well bore or liner.    24.  A downhole tractor according to Claim 22 characterised in that drive is transmitted by way of at least one toothed drive belt.    25.  A downhole tractor according to Claim 1 characterised in that the engagement devices comprise elastomer balls mounted on the commutator so that their axes are at an acute angle with rests to an axis of symmetry of the stator, whereby in use the balls are compressed and expanded, between an outer casing of the commutator    and the well bore or liner, so that the elastomer balls traverse a helical path along the well bore or liner.    26.  A downhole tractor according to any preceding Claim characterised in that the drive system includes an internal combustion engine.    27.  A downhole tractor according to Claim 26 characterised in that a control means is provided to control operation of the internal combustion engine.    28.  A downhole tractor according to Claim 27 characterised in that the control means is operated by at least one of the following command signals from the group comprising: an applied tension command signal on a connecting slickline; an overpull tension command signal on a connecting wireline; and an overpull tension command signal on connecting coiled tubing.    29.  A downhole tractor according to Claim 27 or 28 characterised in that the control means is operated by a command signal transmitted from a downhole communication device.    30.  A downhole tractor according to any of Claims 27 to 29 characterised in that the control means includes a means for switching on and switching off the drive system; and/or a means for changing the speed of the drive system ; and/or a means for changing the direction of travel of the tractor.    31 .  A downhole tractor according to any of Claims 27 to 30 characterised in that the control means includes a means for automatic power sensing and a proportionate controller which senses line tension from surface and payload resistance in either direction of travel of the tractor.    32.  A downhole tractor according to Claim 27 characterised in that a speed control module, an on/off switch and a timer control are provided which are powered from an on board battery.    33.  A downhole tractor according to any of Claims 26 to 32 characterised in that the internal combustion engine comprises at least one radial crank.    34.  A downhole tractor according to any of Claims 26 to 33 characterised in that the internal combustion engine comprises a rotary engine block driving a crank.    35.  A downhole tractor according to any of Claims 26 to 34 characterised in that the internal combustion engine includes at least one crank driven by a reciprocating piston.    36.  A downhole tractor according to any of Claims 26 to 35 characterised in that a starter motor is provided to engage the internal combustion engine by way of a ring gear.    37.  A downhole tractor according to Claim 36 characterised in that the starter motor has a solenoid and/or a timer switch connected thereto for engaging with the ring gear.    38.  A downhole tractor according to either Claim 36 or 37 characterised in that a flywheel is provided with the starter motor.    39. A downhole tractor according to any of Claims 26 to 38 characterised in that firing of the engine is initiated by the tractor sensing a reduced overpull.    40.  A downhole tractor according to any of Claims 26 to 39 characterised in that at least one secondary supercharging system is provided to increase exhaust gas pressure.    41 .  A downhole tractor according to Claim 40 characterised in that the at least one secondary supercharging system increases exhaust gas pressure to at least 5000 PSI (34474 kPa).    42.  A downhole tractor according to Claim 41 characterised in that the at least one secondary supercharging system increases exhaust gas pressure to at least 8000 psi (55158 kPa).    43.  A downhole tractor according to Claim 41 characterised in that the at least 15,000 psi (103421 kPa).    44.  A downhole tractor according to any of Claims 26 to 43 characterised in that a hydrogen peroxide stock tank is provided and multiple spray nozzles are located in an oxygen generator.    45.  A downhole tractor according to Claim 44 characterised in that a flowline connects the hydrogen peroxide stock tank to a pump and flow is controlled by a regulator valve which senses pressure in the oxygen generator.    46.  A downhole tractor according to Claim 44 or 45 characterised in that a fuel storage tank is arranged to contain either petroleum spirit mixture or ether with a combustible lubrication oil such as SAE30 and a high pressure injector pump for injecting fuel into the internal combustion engine.    47.  A downhole tractor according to any of Claims 26 to 46 characterised in that crawler arms expand under power activation against the well bore from a fully collapsed position within the body of the tractor in the unactuated position.    48.  A downhole tractor according to any of Claims 26 to 47 characterised in that a centrifugal separator is included to remove solids and water from well bore fluids to enable separated hydrocarbons to at least partially fuel the internal combustion engine.    49.  A downhole tractor according to any preceding Claim characterised in that a through bore is provided extending through the drive system in order to define a via.  50. A downhole tractor according to any preceding Claim characterised in that the drive system includes an electric motor.
法律状态
(WO201729606) LEGAL DETAILS FOR WO2017029606  Actual or expected expiration date=2019-02-19    Legal state=ALIVE    Status=PENDING     Event publication date=2016-08-16  Event code=WO/APP  Event indicator=Pos  Event type=Examination events  Application details  Application country=WO WOIB2016054904  Application date=2016-08-16  Standardized application number=2016WO-IB54904     Event publication date=2017-02-23  Event code=WO/A1  Event type=Examination events  Published application with search report  Publication country=WO  Publication number=WO2017029606  Publication stage Code=A1  Publication date=2017-02-23  Standardized publication number=WO201729606
专利类型码
A1
国别省市代码
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