Downhole tractor

FIELD: oil and gas industry.

SUBSTANCE: tractor assembly consists of cylindrical body with electric engine installed in it, pivoted wedging supports and at least one section with driving machine made in the form of wheels installed in the body; wheels have with curvature radius equal to radius of the examined well. At that tractor assembly is equipped additionally with pump and drive from electric engine, hydraulic motor with chain drive of wheels and actuator of wedging supports. An extra electric engine can be installed for actuator of wedging supports.

EFFECT: increased draught power of the device.

2 cl, 1 dwg

 

The invention relates to the drilling of horizontal and silnosolenyh oil and gas wells, and in particular to a device for the delivery of the devices in the well.

A device for delivery of devices in a horizontal well (Patent RF №2175374, EV 23/14, 27.10.2001)containing a cylindrical housing, the hinge installed riving bearings, guide rods and the propeller is designed with four bushings that are pairwise connected by disjoining the supports, with each pair of movable sleeve has a running nut and mounted for movement, and the other sleeve fixedly mounted on the guide rods mounted in the respective housings, each of which has an electric motor with step-down gear and lead screw with a pitch, excluding its braking.

The disadvantage of this device is low productivity due to a small linear movement of the device, limited by the distance between the sleeves and a large cycle time of operations.

The closest analogue of the claimed device is a device for delivery of devices in a horizontal well (patent RF №2236549, EV 23/14, 20.09.2004)containing cylindrical body with the installed electric motor with step-down gear and drive shaft, pivotally mounted RA is clinohumite support, the propulsion device, made in the form prescribed in the case of wheels with radius equal to the radius of the investigated wells, supplied by another motor with step-down gear wheel mounted in the housing, is connected with the drive shaft worm gear on each wheel, and disjoining support pivotally connected levers with running nuts mounted on the chassis screws on the right and left threaded with possibility of rapprochement with the rotation driving of the screws from the other motor, with each wedge bearing with rollers.

The drawback of the device is insufficient traction force for use in design exclusively motor with step-down gear.

The objective of the invention is to improve traction device for delivery to the well not only measurement, but also service appliances, with the aim of servicing operations.

This objective is achieved in that the downhole tractor containing a cylindrical housing with the installed electric motor, pivotally mounted wedge supports, and at least one section with a propulsion device, made in the form prescribed in the case of wheels with radius equal to the radius of the investigated wells, according to the invention is supplied by a pump driven by a motor and hydro is oterom with chain drive to the wheels, and activator of disjoining supports.

In addition, in the case of downhole tractor can be fitted with an additional motor for activator riving supports.

The drawing shows a diagram of the device.

The device comprises a cylindrical housing 1 with the installed electric motor 2, a pump 3 and the motor 4, the proppants of the supports 6, and the activator riving bearings 7. On the rear part of the housing 1 a of the sleeve 9. The propulsion device includes wheel 5 with a radius equal to the radius of the investigated wells that are installed on the axles 8 of the disjoining of the supports 6. The number of wheels and their diameter is defined structurally in the manufacture of the device.

Delivery logging tool or service equipment in a horizontal well using this device is as follows.

Downhole tractor connect coupling 9 with the geophysical instrument and geophysical cable (not shown), or with service equipment and geophysical cable (not shown)and lowered into the well. When the tractor the well's horizontal section includes a motor 2, which drives the activator riving bearings 7. Riving bearings 6 are moved apart and the wheels 5 rest against the borehole wall. Upon reaching the desired power PR is pressing the activator riving bearings 7 stops to push riving support. Torque of the electric motor 2 is transmitted to the pump 3, resulting in the action of the hydraulic motor 4. With the hydraulic motor 4 through a chain transmission (not shown) are driven wheel 5.

For lifting the downhole tractor of wells include activator riving bearings 7 in the opposite direction to fold the disjoining legs and a downhole tractor is removed by winding logging cable Bay wireline truck.

Increase the tractive effort developed by the downhole tractor, is provided by the use of the motor 4 in the design of the device. Thus substantially increases the torque transmitted to the wheels 5 of the downhole tractor.

1. Downhole tractor containing a cylindrical housing with the installed electric motor, pivotally mounted wedge supports, and at least one section with a propulsion device, made in the form prescribed in the case of wheels with radius equal to the radius of the investigated wells, characterized in that it is equipped with a pump driven by an electric motor and a hydraulic motor with chain drive to the wheels, and also an activator of the riving supports.

2. The downhole tractor of claim 1, characterized in that the housing has an additional motor for activator riving supports.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: mechanism with hydraulic drive for continuous movement inside the well includes a piston; the first housing around the first head of the above piston; the first armature connected to the above first housing for its fastening at movement of the first head; the second housing around the second head of the above piston, the second armature connected to the above second housing for its fastening at movement of the second head; and assembly of hydraulic sequence, which connects the housings as to fluid medium so that influx of hydraulic pressure to power chamber of one housing moves the piston head in that piston and displaces fluid medium from return chamber of that housing to return chamber of the other housing for movement of the other housing relative to the piston. To each of the armatures there connected is control mechanism of their activation and deactivation, which activates rigidity of one armature with deactivation delay of rigidity of the other armature, thus deactivating the other armature only after complete rigidity of one armature is achieved.

EFFECT: providing the possibility of supporting continuous movement inside the well and reliable fastening at movement of pulling equipment.

11 cl, 8 dwg

FIELD: mining.

SUBSTANCE: method includes lowering of a downhole tool on a logging cable into a well shaft, fixation of the downhole tool in the well shaft at the first place of works in the well shaft, performing of an operation of sampling or taking specimens of beds of fluid medium using a sampling tool connected with the first section. At the same time the operation of sampling or taking specimens is performed at the second place of works in the well shaft, when the downhole tool remains fixed in the well shaft at the first place of works, and at the same time the second place of works is spaced with the first place of works in direction parallel to the longitudinal axis of the downhole tool. The first section of the downhole tool and the second section of the downhole tool are moved so that the first section of the downhole element is moved from the second place of works in direction parallel to the longitudinal axis of the downhole tool, and the second section of the downhole tool is moved to the second place of works in a direction parallel to the longitudinal axis of the downhole tool. Then the operation of core sampling is performed at the second place of works using a core sampling tool connected with the second section.

EFFECT: invention provides for more accurate performance of testing operations, operations of sampling or taking specimens, completion operations.

16 cl, 19 dwg

FIELD: oil and gas production.

SUBSTANCE: proposed oiler consists of connection flange, preventer, signaling device, intake chamber, seal assembly, guide rollers, hydraulic cylinder with hydraulic pump and hydraulic system hose. It is furnished with bracket with swivel cramp hinged to oiler posts. Intake chamber is fitted on said cramp. Besides, hydraulic cylinder with rod coupled with intake chamber lug is arranged on said cramp. Proposed design of oiler allows fitting it on production tree and dismantling there from by remote means with the help of hydraulic cylinder controlled by hydraulic pump. No handling equipment is required.

EFFECT: higher safety, reduced labor input.

2 dwg

FIELD: well surveying.

SUBSTANCE: invention belongs to the well surveying. For this purpose the submersible pumping systems, containing an electricity-driven submersible pump in the bore hole, is used. The passing of logging equipment is fulfilled within the inner electrical submersible pump passage up to the position below the inner passage way of the electrical submersible pump at the time of exploitation of such a pump inside the bore hole. According to the second scheme the logging equipment is shifted through the inner lengthwise passage and through the motor shaft of the electrical submersible pump system, located within the bore hole, up to the position beneath the inner lengthwise passage. The borehole fluid is extracted through the flow passage, not being a part of the inner lengthwise passage during the shift of the logging equipment along the inner lengthwise passage. Well logging system includes electrical submersible pump system, having the inner flow passage, going through the electrical submersible pump in order to receive the logging equipment system. The logging equipment system is fulfilled with the possibility of electrical submersible pump passing along the inner flow passage up to the position below the inner passage way of the electrical submersible pump. The electrical submersible pump contains a flow fluid passage, separated from the inner flow passage in such a way, that the inner flow passage do not receives the fluid flow.

EFFECT: enhancement of the well exploitation efficiency by means of well logging procedures beneath the well equipment point from inside the bore hole.

18 cl, 6 dwg

FIELD: oil and gas production.

SUBSTANCE: device includes external fixed housing in which there installed is electric motor with reducing reduction gear, screw gear, upper and lower movable housings with pinion racks, in each of which there installed is a pair of spring-loaded wedging cams; at that, the other pair is turned through 90° relative to longitudinal axis of the device; folding mechanism of lower pair of cams by means of rack, axis with gear quadrant, which is fixed on movable insert; in lower movable housing there made is cam slot, low pair of cams is fixed on the axis in movable insert.

EFFECT: improving reliability, increasing pulling force, increasing movement speed.

2 dwg

FIELD: mining.

SUBSTANCE: invention refers to mining, particularly to oil and gas production industry and can be implemented at oil and gas well completion. The facility for delivery of logging equipment into well consists of a logging cable and of a facility to transfer logging equipment in the well made in form of a housing, inside of which a hydraulic promoter is installed; the promoter is made in form of two screw propellers and is connected to a drive; also the drive is installed in a geometry case and arranged in the case with a circular gap, while two screw propellers can rotate in opposite directions.

EFFECT: increased reliability of logging equipment delivery on horizontal section of well owing to elimination of logging cable twisting.

9 cl, 8 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions refers to drilling, particularly to method, facility and system for displacement of tools and other devices in well. The method consists in following stages: measurement of drive unit rate, measurement of tractor speed, determination of drive unit slipping on base of drive unit rate and tractor speed, comparison of drive unit slipping with acceptable value of slipping for determination of excessive drive unit slipping, and increasing normal force on the drive unit at excessive slipping of the drive unit. The facility contains a measuring unit designed to determine speed of the tractor in well, and a drive module including the drive unit contacting with a wall of the well and traveling relative to it. The drive module evaluates speed of the drive unit in well and applies normal force to the latter to bring the drive unit in touch with the wall in well and to displace it relative to the wall of well; also the drive module changes normal force at the drive unit on base of tractor speed and drive unit rate. The system contains at least two drive modules generating and applying normal force to at least one element connected with the tractor and displacing the tractor in well; the system also contains at least one measuring unit repeatedly measuring at least one of the following values: tractor speed in well and diametre of the well, further, it contains a main controller in connection with at least two modules of drive and at least one measuring unit; also at least one module of drive changes value of normal force required for displacement of the tractor in well on base of at least partially signals received from the main controller.

EFFECT: facilitating continuous adjustment of normal force on one or several drive units automatically without human intervention in real time mode.

10 cl, 15 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to horizontal and high-inclined oil and gas wells surveying, specifically to carriers for hardware transportation to the well. Carrier contains electric motor driven, geared-down cylindrical body, wedge bearings and propeller in the form of wheels with rounded radius equal to surveyed well radius mounted spin on spindles of wedge bearings. Besides carrier is supplied with centraliser wheels mounted on lever shaft pivotally connected to the body and spring-loaded centraliser plunger furnished with stop block interworking with propeller plunger. Wedge bearings are overall length offset, fitted with spur gear sectors and pivotally connected by levers with spring-loaded propeller plunger. Herewith each wheel is connected to down gear through worm gear one shaft of which is supplied with lead screw and sliding nut groove of which enters stopper boss mounted in the body.

EFFECT: higher performance reliability.

1 dwg

FIELD: mining; transportation.

SUBSTANCE: tractive unit can include tracklaying assembly including set of rollers and continuous caterpillar located rotatable around rollers. Electric motor can be implemented with ability of caterpillar rotation around rollers. With opposite ends of tracklaying assembly can be pivotally connected top and bottom levers, pivotally connected to track unit body. It can be provided links unit for application of the outward force to the tracklaying assembly for displacement of tracklaying assembly into open position and home return of tracklaying assembly. For actuation of affection lever or links unit it can be provided lead-screw, connected to the second electric motor, or guide bar connected to hydraulic system.

EFFECT: provides transportation of instruments in open holes for stratums appraisal and operation at immersion into mud in wells with high temperatures.

45 cl, 31 dwg, 2 tbl

Downhole tool // 2331753

FIELD: petroleum industry.

SUBSTANCE: invention is referred to downhole tools, i.e. tools used in wells. The tool includes axle drive provided with connection of electric power cable installed upwards the wellbore and fastening mechanism engaged downhole between the first configuration to prevent rotational and axial movement of the unit and the second configuration to move the fastening mechanism in axial direction, axle drive which moves the fastening mechanism in axial direction downwards the wellbore, when in the second configuration, motor installed in well end of the drive, hydraulic pump connected to the motor and provided with hydraulic power source and functional part connected below the hydraulic pump and powered by such pump, operation of axle drive ensuring axial movement of the functional part downwards the wellbore. Invention ensures run RIH with slickline and is capable of ensuring sufficient weight on bit and torque required to achieve efficient drilling.

EFFECT: capability to ensure sufficient weight on bit and torque required to achieve efficient drilling.

22 cl, 10 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes selection of cable of required rigidity and fixing devices on it. Transporting of devices into well is performed under effect from weight of cable and devices. Cable also contains inner hermetic pipe, which is plugged on both sides prior to lowering cable into well. Liquid is pumped into pipe under pressure through locking valve in upper plug and is kept in pipe under constant pressure during operation. After that cable is lowered with devices fixed to it. Value of pressure of liquid in pipe is determined from formula Ppipe≥ Pwell(Scable/Spipe-1)-QcablexLcable/Spipe<Ptear, where Ppipe - pressure of fluid in pipe, kg-wt/sm2; Scable - cross-section of cable with pipe, sm2; Pwell - hydrostatic pressure of well liquid column at depth of planned delivery of devices on cable, kg-wt/sm2; Spipe - cross-section area of pipe aperture and plug area equal to it in contact with liquid in pipe, sm; Qcable - weight of 1 km of cable with pipe, kg-wt; Lcable - length of cable to depth of planned delivery of devices, km; Ptear - pressure of liquid in pipe leading to tear of cable, kg-wt/sm2, determined from formula: Ptear=Ftear/Spipe, where Ftear - tear force for cable according to documentation, kg-wt.

EFFECT: higher efficiency.

3 cl, 1 dwg, 1 tbl

FIELD: devices for supporting measuring instruments on a drill pipe, rod or wireline.

SUBSTANCE: six-link leverage may be adapted to align with adjoining surface profile. The mechanism comprises central lever defined by tool body and intermediate lever spaced a distance from central lever. The intermediate lever may move to provide intermediate lever alignment with adjoining surface. Leverage also comprises two front levers each pivotally connected to corresponding ends of intermediate lever and to central lever to change angular leverage position and to vary distance between intermediate and central levers. Leverage also comprises two centering levers arranged between front ones and pivotally connected to intermediate lever and to central lever. One hinge connection is made as linearly movable one connected to central lever. To provide alignment with well bore or well pipe six-link leverages of pulling mechanism radially project from body thereof and touch adjoining well bore or pipe surface.

EFFECT: possibility to increase tractive efficiency of pulling mechanism in the case of well wall irregularities.

17 cl, 8 dwg

FIELD: oil and gas production, particularly gas well logging.

SUBSTANCE: device comprises hollow cylindrical body with geared-down electric drive installed in it. Electric drive has tightened drive shaft and electronic circuit. Fluid-tight partitioning bush is arranged in body between electric drive and electronic circuit. The partitioning bush has orifice, which connects electric drive interior with ambient space. Two check valves are arranged inside the orifice. One check valve may be opened by excessive ambient pressure. Another one may be opened under the action of internal excessive pressure.

EFFECT: increased reliability of logging instrument operation due to possibility to compensate pressure applied to output shaft of instruments and elimination of electronic control circuit damage in the case of shaft tightness failure.

1 dwg

Downhole tool // 2331753

FIELD: petroleum industry.

SUBSTANCE: invention is referred to downhole tools, i.e. tools used in wells. The tool includes axle drive provided with connection of electric power cable installed upwards the wellbore and fastening mechanism engaged downhole between the first configuration to prevent rotational and axial movement of the unit and the second configuration to move the fastening mechanism in axial direction, axle drive which moves the fastening mechanism in axial direction downwards the wellbore, when in the second configuration, motor installed in well end of the drive, hydraulic pump connected to the motor and provided with hydraulic power source and functional part connected below the hydraulic pump and powered by such pump, operation of axle drive ensuring axial movement of the functional part downwards the wellbore. Invention ensures run RIH with slickline and is capable of ensuring sufficient weight on bit and torque required to achieve efficient drilling.

EFFECT: capability to ensure sufficient weight on bit and torque required to achieve efficient drilling.

22 cl, 10 dwg

FIELD: mining; transportation.

SUBSTANCE: tractive unit can include tracklaying assembly including set of rollers and continuous caterpillar located rotatable around rollers. Electric motor can be implemented with ability of caterpillar rotation around rollers. With opposite ends of tracklaying assembly can be pivotally connected top and bottom levers, pivotally connected to track unit body. It can be provided links unit for application of the outward force to the tracklaying assembly for displacement of tracklaying assembly into open position and home return of tracklaying assembly. For actuation of affection lever or links unit it can be provided lead-screw, connected to the second electric motor, or guide bar connected to hydraulic system.

EFFECT: provides transportation of instruments in open holes for stratums appraisal and operation at immersion into mud in wells with high temperatures.

45 cl, 31 dwg, 2 tbl

FIELD: oil and gas industry.

SUBSTANCE: invention refers to horizontal and high-inclined oil and gas wells surveying, specifically to carriers for hardware transportation to the well. Carrier contains electric motor driven, geared-down cylindrical body, wedge bearings and propeller in the form of wheels with rounded radius equal to surveyed well radius mounted spin on spindles of wedge bearings. Besides carrier is supplied with centraliser wheels mounted on lever shaft pivotally connected to the body and spring-loaded centraliser plunger furnished with stop block interworking with propeller plunger. Wedge bearings are overall length offset, fitted with spur gear sectors and pivotally connected by levers with spring-loaded propeller plunger. Herewith each wheel is connected to down gear through worm gear one shaft of which is supplied with lead screw and sliding nut groove of which enters stopper boss mounted in the body.

EFFECT: higher performance reliability.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions refers to drilling, particularly to method, facility and system for displacement of tools and other devices in well. The method consists in following stages: measurement of drive unit rate, measurement of tractor speed, determination of drive unit slipping on base of drive unit rate and tractor speed, comparison of drive unit slipping with acceptable value of slipping for determination of excessive drive unit slipping, and increasing normal force on the drive unit at excessive slipping of the drive unit. The facility contains a measuring unit designed to determine speed of the tractor in well, and a drive module including the drive unit contacting with a wall of the well and traveling relative to it. The drive module evaluates speed of the drive unit in well and applies normal force to the latter to bring the drive unit in touch with the wall in well and to displace it relative to the wall of well; also the drive module changes normal force at the drive unit on base of tractor speed and drive unit rate. The system contains at least two drive modules generating and applying normal force to at least one element connected with the tractor and displacing the tractor in well; the system also contains at least one measuring unit repeatedly measuring at least one of the following values: tractor speed in well and diametre of the well, further, it contains a main controller in connection with at least two modules of drive and at least one measuring unit; also at least one module of drive changes value of normal force required for displacement of the tractor in well on base of at least partially signals received from the main controller.

EFFECT: facilitating continuous adjustment of normal force on one or several drive units automatically without human intervention in real time mode.

10 cl, 15 dwg

FIELD: mining.

SUBSTANCE: invention refers to mining, particularly to oil and gas production industry and can be implemented at oil and gas well completion. The facility for delivery of logging equipment into well consists of a logging cable and of a facility to transfer logging equipment in the well made in form of a housing, inside of which a hydraulic promoter is installed; the promoter is made in form of two screw propellers and is connected to a drive; also the drive is installed in a geometry case and arranged in the case with a circular gap, while two screw propellers can rotate in opposite directions.

EFFECT: increased reliability of logging equipment delivery on horizontal section of well owing to elimination of logging cable twisting.

9 cl, 8 dwg

FIELD: oil and gas production.

SUBSTANCE: device includes external fixed housing in which there installed is electric motor with reducing reduction gear, screw gear, upper and lower movable housings with pinion racks, in each of which there installed is a pair of spring-loaded wedging cams; at that, the other pair is turned through 90° relative to longitudinal axis of the device; folding mechanism of lower pair of cams by means of rack, axis with gear quadrant, which is fixed on movable insert; in lower movable housing there made is cam slot, low pair of cams is fixed on the axis in movable insert.

EFFECT: improving reliability, increasing pulling force, increasing movement speed.

2 dwg

FIELD: well surveying.

SUBSTANCE: invention belongs to the well surveying. For this purpose the submersible pumping systems, containing an electricity-driven submersible pump in the bore hole, is used. The passing of logging equipment is fulfilled within the inner electrical submersible pump passage up to the position below the inner passage way of the electrical submersible pump at the time of exploitation of such a pump inside the bore hole. According to the second scheme the logging equipment is shifted through the inner lengthwise passage and through the motor shaft of the electrical submersible pump system, located within the bore hole, up to the position beneath the inner lengthwise passage. The borehole fluid is extracted through the flow passage, not being a part of the inner lengthwise passage during the shift of the logging equipment along the inner lengthwise passage. Well logging system includes electrical submersible pump system, having the inner flow passage, going through the electrical submersible pump in order to receive the logging equipment system. The logging equipment system is fulfilled with the possibility of electrical submersible pump passing along the inner flow passage up to the position below the inner passage way of the electrical submersible pump. The electrical submersible pump contains a flow fluid passage, separated from the inner flow passage in such a way, that the inner flow passage do not receives the fluid flow.

EFFECT: enhancement of the well exploitation efficiency by means of well logging procedures beneath the well equipment point from inside the bore hole.

18 cl, 6 dwg

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