CN114562220B - Variable diameter stabilizer for well track control - Google Patents
Variable diameter stabilizer for well track control Download PDFInfo
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- CN114562220B CN114562220B CN202210220664.3A CN202210220664A CN114562220B CN 114562220 B CN114562220 B CN 114562220B CN 202210220664 A CN202210220664 A CN 202210220664A CN 114562220 B CN114562220 B CN 114562220B
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- stroke control
- control block
- mandrel
- block
- stroke
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- 239000003381 stabilizer Substances 0.000 title claims abstract description 38
- 238000005553 drilling Methods 0.000 claims abstract description 33
- 239000012530 fluid Substances 0.000 claims description 17
- 239000003921 oil Substances 0.000 claims description 17
- 239000010687 lubricating oil Substances 0.000 claims description 9
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 9
- 238000000926 separation method Methods 0.000 description 8
- 230000008602 contraction Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a variable diameter stabilizer for controlling a well track, which is characterized by comprising a body, an upper mandrel, a stroke control block and a lower mandrel (and a hook seat, wherein the body is hollow and cylindrical, the upper mandrel is connected with the stroke control block, the stroke control block is connected with the lower mandrel through threads, a columnar component consisting of the upper mandrel, the stroke control block and the lower mandrel is arranged in the body and is coaxial with the body, the hook seat is arranged in the body through a pin, the hook seat limited by the pin can rotate relative to the body but can not move axially relative to the body, a lock hook is arranged between the stroke control block and the lock hook positioning block, the lock hook comprises a rotary hinge, a hook rod and an embedded head, and the rotary hinge is hinged on the hook seat through a pin shaft. The invention can control the well track by changing the lower drilling tool assembly structure without tripping, thereby reducing the non-production time and improving the drilling efficiency.
Description
Technical Field
The invention relates to an impact device, in particular to a variable diameter stabilizer for controlling a well track, and belongs to the technical field of mechanical engineering or drilling engineering.
Background
In the vertical well drilling process, well inclination is easy to occur due to the influences of characteristics such as formation heterogeneity, drill string vibration and the like, and therefore well inclination needs to be controlled. In the drilling process of a directional well, a large-displacement well or a horizontal well, the combination of increasing well deviation, reducing well deviation and the like is needed for realizing the purpose of drilling an oil layer. For the purpose of controlling the well track, the drilling site is realized by installing a stabilizer in a drill string and forming different types of lower drilling tool combinations in combination with a drill bit, a drill rod and the like.
To achieve the ramping up, down, and stabilizing of the borehole trajectory, the lower tool assembly is often changed by combining the number of stabilizers and the installation location. However, in the prior art, the lower drill string is often lowered into the well again after the drill string is pulled out of the well bore, resulting in long non-production times and inefficient drilling. The prior art also has variable diameter stabilizers such as drill press type, hydraulic type and ball casting type, but different types of variable diameter stabilizers still have respective problems in structure, efficiency and applicability. In this regard, it is desirable to design a variable diameter stabilizer for dedicated wellbore trajectory control so that the stabilizer can achieve multiple levels of diameter variation downhole and without tripping during the diameter variation.
Disclosure of Invention
The invention aims to provide a variable-diameter stabilizer for controlling the track of a well bore, so that the track of the well bore can be controlled by changing a lower drilling tool assembly without tripping, and the drilling efficiency is effectively improved.
In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problem is as follows:
The utility model provides a variable diameter stabilizer for well track control, its characterized in that includes body, last dabber, stroke control piece, lower dabber and hook seat, the body is cavity cylindric, go up dabber and stroke control piece, stroke control piece and lower dabber all pass through threaded connection, by the column subassembly that goes up dabber, stroke control piece and lower dabber are constituteed is located in the body and coaxial with the body, the hook seat passes through the pin and installs in the body, but can not follow relative body axial displacement by the hook seat of pin restriction, be equipped with the latch hook between stroke control piece and the hook seat, the latch hook includes swivel hinge, hook lever and embedding head, swivel hinge articulates on the hook seat through the round pin axle.
The upper mandrel, the stroke control block and the lower mandrel are cylindrical and are all provided with hollow flow channels for circulating drilling fluid, the outer diameter of the upper end of the upper mandrel is larger than that of the lower end of the upper mandrel to form a step, a spring seat is arranged at the upper end of the body, a reset spring is arranged between the step of the upper mandrel and the upper end of the spring seat, and a driving sleeve is arranged at the upper end of the upper mandrel in a threaded connection mode.
One side of the stroke control block is provided with a longitudinal plane parallel to the axis of the stroke control block, the longitudinal plane of the stroke block is provided with a stroke control groove, the embedded head slides in the stroke control groove, the stroke control groove is internally provided with a shrinkage position, a primary reducing position, a primary locking position and a secondary reducing position, a path from the shrinkage position to the primary reducing position, the primary reducing position to the primary locking position, the primary locking position to the secondary reducing position and the secondary reducing position to the shrinkage position is provided with a slope, the stroke control groove is provided with a groove bottom plane with the same depth except for the slope arranged on the path, and the tail end of the slope is provided with a plane perpendicular to the groove bottom so as to form a non-return step for preventing the embedded head from sliding backwards.
The stroke control block is also provided with a stroke block oil hole, the stroke block oil hole is parallel to the axis of the stroke control block and penetrates through the stroke control block, the upper end and the lower end of the stroke control block are respectively provided with an upper internal thread and a lower internal thread, the upper internal thread is connected with the lower end of the upper mandrel through threads, and the lower internal thread is connected with the upper end of the lower mandrel through threads.
The hook seat is provided with a positioning groove, lugs, hook seat oil holes and pin shaft holes, the positioning groove is an annular groove positioned at the periphery of the hook seat, the hook seat is installed in the body through pins, the lugs are used for being connected with a rotary hinge through pin shafts, the hook seat oil holes are parallel to the axis of the hook seat and are used as flow channels of lubricating oil at the upper end and the lower end of the hook seat, and the pin shaft holes are formed in the lugs and are used for installing pin shafts.
And a rubber cushion block is arranged between the rotary hinge and each lug, and the pin shaft penetrates through the lug, the rubber cushion block and the rotary hinge.
The middle part of the upper mandrel is provided with a step, a plurality of wedges are arranged between the step in the middle part of the upper mandrel and the stroke control block, each wedge is matched with three centralizing blocks, the centralizing blocks penetrate through radial holes in the middle part of the body, and when the wedges axially move along the body, the centralizing blocks synchronously move in the radial holes.
The wedge blocks are cylindrical in whole and provided with middle through holes for the upper core shaft to pass through, each wedge block is provided with three inclined planes, and each inclined plane is provided with a dovetail groove or a T-shaped groove; one end of the righting block is provided with a lug matched with the dovetail groove or the T-shaped groove; the convex blocks of the centralizing block are matched with dovetail grooves or T-shaped grooves on the inclined plane of the wedge block, so that the centralizing block realizes radial movement when the wedge block axially moves.
The throttle sleeve is arranged at the lower end of the body, a longitudinal groove is formed in the inner wall of the throttle sleeve, blades of the throttle lever are embedded into the longitudinal groove of the throttle sleeve, a plurality of axial flow channels are formed in the throttle lever, the middle of the throttle lever is conical, and the upper end of the throttle lever is matched with the lower end of the lower mandrel to form a throttle unit.
A floating piston and an inner and outer flow separation plate are arranged between the lower end of the lower mandrel and the inner wall of the body.
The upper end of the body is connected with the upper joint through a threaded connection mode, and the lower end of the body is connected with the lower joint through a threaded connection mode.
The upper end of the driving sleeve is provided with a stud blind hole, and the stud blind hole is used for conveying the upper mandrel and a connecting piece thereof into the body or taking the upper mandrel and the connecting piece out of the body by using a tool during installation or disassembly.
Rubber gaskets are arranged below the pins arranged on the body.
Sealing rings are arranged between the upper end of the upper mandrel and the inner wall of the body, between the centralizing block and the body, between the outer wall of the lower mandrel and the floating piston, between the floating piston and the inner wall of the body, between the outer wall of the lower mandrel and the inner and outer flow separation plates, and between the inner and outer flow separation plates and the inner wall of the body.
And a rectangular sealing ring is arranged on the outer wall of the righting block.
And a radial slurry flow passage is arranged on the body between the floating piston and the inner and outer flow separation plates.
The upper core shaft, the centralizing block, the floating piston and the inner wall of the body form an oil storage cavity, and lubricating oil is filled in the oil storage cavity.
In the initial state, the slurry pump is not started, drilling fluid is not circulated, the end part of the centralizing block is flush with the outer wall of the body where the centralizing block is installed, and at the moment, the embedding head of the latch hook is positioned at the contraction position in the stroke control groove; starting a slurry pump, enabling drilling fluid to flow into the variable-diameter stabilizer from the drill string, enabling the drilling fluid to flow through other downhole tools such as the variable-diameter stabilizer and the screw drilling tool and a drill bit after the drilling fluid circulates, and returning upwards along a borehole annulus between the drill string and a well wall, so that at the position of the variable-diameter stabilizer, a pressure difference exists between the drilling fluid in the variable-diameter stabilizer and slurry in the borehole annulus; slurry in the well annulus can flow into a space formed by the floating piston, the inner and outer flow isolation plates, the lower core shaft and the inner wall of the body through a radial slurry flow channel between the floating piston and the inner and outer flow isolation plates; because the upper end of the floating piston is high-pressure lubricating oil and the lower end of the floating piston is low-pressure slurry, the floating piston automatically adjusts the position, so that the pressure at the two ends is balanced, namely the pressure of the lubricating oil is always the same as the pressure in the well annulus, and is lower than the slurry pressure in the variable-diameter stabilizer; meanwhile, the high-pressure drilling fluid pushes the driving sleeve to move downwards together with the upper mandrel, the stroke control block and the lower mandrel, the reset spring compresses, and the wedge block moves downwards together with the upper mandrel, so that the centralizing block is pushed to extend outwards; when the stroke control block moves downwards, the embedded head slides into a first-stage reducing position from the contracted position, and the hook seat slightly rotates as required in the process; through the operation, the outer diameter of the centralizing block is larger than the outer diameter of the body, a diameter-changing process is completed, and the overflow area between the lower mandrel and the throttle rod is reduced in the process.
According to the drilling process, the pump is stopped, the pressure difference of fluid at two ends of the floating piston is eliminated, the reset spring drives the upper mandrel to drive the wedge block to move upwards, but due to the fact that the slope of the stroke control groove has a non-return function, the embedding head slides from the first-stage reducing position to the first-stage locking position, namely the embedding head limits the stroke control block and the upper mandrel to move upwards, the centralizing block is maintained in the first-stage reducing state, and the reset spring is still in a compressed state.
When the pump is started for the second time, the driving sleeve drives the upper mandrel, the stroke control block and the lower mandrel to move downwards, the reset spring is further compressed, the stroke control block further moves downwards, the embedding head slides into the second-stage reducing position from the first-stage locking position, the upper mandrel synchronously drives the wedge block to move downwards and further pushes the centralizing block outwards, the extending size of the centralizing block is maximum, and the overflow area between the lower mandrel and the throttle rod is minimum.
When the pump is stopped for the second time, the pressure difference at the two ends of the floating piston is eliminated, the upper mandrel, the wedge block, the stroke control block and the lower mandrel move upwards under the action of the reset spring, the wedge block drives the centralizing block to shrink, so that the outer diameter of the centralizing block is equal to the outer diameter of the body, and at the moment, the embedding head slides to a shrinking position from a second-stage reducing position.
Compared with the prior art, the invention has the following beneficial effects: (1) The multi-stage diameter change can be realized, namely, the righting block can realize two diameters larger than the outer diameter of the body; (2) According to the invention, the extension and contraction of the centralizing block of the variable-diameter stabilizer are realized through the opening and closing of the ground slurry pump, so that the inclination increasing, the inclination stabilizing and the inclination decreasing of the well track are realized by changing the structure of the lower drilling tool assembly, the stabilizer with the fixed size is not required to be taken out of the well through lifting and lowering, the stabilizer with the fixed size is replaced with the stabilizer with the other size, and the change of the structure of the lower drilling tool is realized, and the drilling efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a variable diameter stabilizer for wellbore trajectory control according to the present invention in full section;
FIG. 2 is a schematic cross-sectional view of A-A in FIG. 1;
FIG. 3 is a schematic cross-sectional view of B-B in FIG. 1;
FIG. 4 is a schematic view of the cross section C-C of FIG. 1;
FIG. 5 is a schematic view of the cross section D-D of FIG. 1;
FIG. 6 is a schematic cross-sectional view of E-E of FIG. 1;
FIG. 7 is a schematic diagram of a stroke control block of a variable diameter stabilizer for wellbore trajectory control according to the present invention;
FIG. 8 is another schematic diagram of a travel control block of a variable diameter stabilizer for wellbore trajectory control of the present invention;
FIG. 9 is a schematic diagram of a shackle of a variable diameter stabilizer for wellbore trajectory control according to the present invention;
FIG. 10 is a schematic view of the configuration of a hook block of a variable diameter stabilizer for wellbore trajectory control according to the present invention;
FIG. 11 is another schematic view of the hook block of a variable diameter stabilizer for wellbore trajectory control of the present invention;
In the figure: 1. the upper joint, 2, body, 3, drive sleeve, 4, upper core shaft, 5, seal ring, 6, return spring, 7, spring seat, 8, pin, 9, rubber shim, 10, wedge, 11, centralizer, 12, rectangular seal ring, 13, travel control block, 13a, travel block upper internal thread, 13b, travel block lower internal thread, 13c, travel block longitudinal plane, 13d, travel control slot, 13e, contracted position, 13f, first stage variable diameter position, 13g, first stage locking position, 13h, second stage variable diameter position, 13i, travel block oil hole, 14, latch hook, 14a, rotary hinge, 14b, hook lever, 14c, insert head, 15, lower core shaft, 16, pin, 17, rubber shim, 18, hook seat, 18a, locating slot, 18b, lug, 18c, hook seat oil hole, 18d, pin hole, 19, piston, 20, inner and outer flow spacer, 21, throttle lever, 22, throttle sleeve, 23.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1-6 and fig. 9, a variable diameter stabilizer for controlling a track of a borehole is characterized by comprising a body 2, an upper mandrel 4, a stroke control block 13, a lower mandrel 15 and a hook seat 18, wherein the body 2 is hollow and cylindrical, the upper mandrel 4, the stroke control block 13 and the lower mandrel 15 are all connected through threads, a columnar assembly consisting of the upper mandrel 4, the stroke control block 13 and the lower mandrel 15 is arranged in the body 2 and is coaxial with the body 2, the hook seat 18 is arranged in the body 2 through a pin 8, the hook seat 18 limited by the pin 8 can rotate relative to the body 2 but cannot move axially relative to the body 2, a latch hook 14 is arranged between the stroke control block 13 and the hook seat 18, the latch hook 14 comprises a rotary hinge 14a, a latch rod 14b and an embedding head 14c, and the rotary hinge 14a is hinged on the hook seat 18 through a pin 16.
The upper mandrel 4, the stroke control block 13 and the lower mandrel 15 are all cylindrical and are all provided with hollow runners for circulating drilling fluid, the outer diameter of the upper end of the upper mandrel 4 is larger than the outer diameter of the lower end to form a step, the upper end of the body 2 is provided with a spring seat 7, a return spring 6 is arranged between the step of the upper mandrel 4 and the upper end of the spring seat 7, and the upper end of the upper mandrel 4 is provided with a driving sleeve 3 in a threaded connection mode.
As shown in fig. 7 and 8, one side of the stroke control block 13 is provided with a stroke block longitudinal plane 13c, the stroke block longitudinal plane 13c is parallel to the axis of the stroke control block 13, the stroke block longitudinal plane 13c is provided with a stroke control groove 13d, the insertion head 14c slides in the stroke control groove 13d, the stroke control groove 13d is internally provided with a contraction position 13e, a primary reducing position 13f, a primary locking position 13g and a secondary reducing position 13h, and slopes are arranged on paths from the contraction position 13e to the primary reducing position 13f, the primary locking position 13f to the primary locking position 13g, the primary locking position 13g to the secondary reducing position 13h and the secondary reducing position 13e, and the stroke control groove 13d is a groove bottom plane with the same depth except for the slopes arranged on the paths, and the tail end of the slopes is a plane perpendicular to the groove bottom so as to form a non-return step for preventing the insertion head 14c from sliding backwards.
The stroke control block 13 is further provided with a stroke block oil hole 13i, the stroke block oil hole 13i is parallel to the axis of the stroke control block 13 and penetrates through the stroke control block 13, the upper end and the lower end of the stroke control block 13 are respectively provided with an upper internal thread 13a and a lower internal thread 13b, the upper internal thread 13a is in threaded connection with the lower end of the upper mandrel 4, and the lower internal thread 13b is in threaded connection with the upper end of the lower mandrel 15.
As shown in fig. 10 and 11, the hook seat 18 is provided with a positioning groove 18a, a lug 18b, a hook seat oil hole 18c and a pin shaft hole 18d, the positioning groove 18a is an annular groove located at the periphery of the hook seat 18, the hook seat 18 is installed in the body 2 through the pin 8, the lug 18b is used for being connected with the rotary hinge 14a through the pin shaft 16, the hook seat oil hole 18c is parallel to the axis of the hook seat 18 and is used as a flow passage of lubricating oil at the upper end and the lower end of the hook seat 18, and the pin shaft hole 18d is formed in the lug 18b and is used for installing the pin shaft 16.
A rubber cushion block 17 is arranged between the rotary hinge 14a and each lug 18b, and the pin 16 passes through the lug 18b, the rubber cushion block 17 and the rotary hinge 14a.
The middle part of the upper mandrel 4 is provided with a step, a plurality of wedges 10 are arranged between the step at the middle part of the upper mandrel 4 and the stroke control block 13, each wedge 10 is matched with three centralizing blocks 11, the centralizing blocks 11 penetrate through radial holes at the middle part of the body 2, and when the wedges 10 axially move along the body 2, the centralizing blocks 11 synchronously move in the radial holes.
The wedge blocks 10 are cylindrical in shape as a whole and are provided with middle through holes for the upper mandrel 4 to pass through, each wedge block 10 is provided with three inclined planes, and each inclined plane is provided with a dovetail groove or a T-shaped groove; one end of the righting block 11 is provided with a lug matched with the dovetail groove or the T-shaped groove; the projections of the righting blocks 11 cooperate with dovetail grooves or T-grooves on the inclined plane of the wedge 10 such that when the wedge 10 moves axially, the righting blocks 11 perform radial movements.
The throttle sleeve 22 is installed in the lower extreme of body 2 and its inner wall is equipped with longitudinal groove, the blade embedding throttle sleeve 22 of throttle lever 21 is in the longitudinal groove, be equipped with a plurality of axial runners on the throttle lever 21 and the centre of throttle lever 21 is coniform, the lower extreme cooperation of throttle lever 21 upper end and lower dabber 15 forms the throttle unit.
A floating piston 19 and an inner and outer flow separation plate 20 are arranged between the lower end of the lower mandrel 15 and the inner wall of the body 2.
The upper end of the body 2 is connected with the upper joint 1 through a threaded connection mode, and the lower end of the body 2 is connected with the lower joint 23 through a threaded connection mode.
The upper end of the driving sleeve 3 is provided with a stud blind hole, and the stud blind hole is used for using a tool to send the upper mandrel 4 and a connecting piece thereof into the body 2 or take the upper mandrel out of the body 2 during installation or disassembly.
Rubber gaskets 9 are arranged below the pins 8 arranged on the body 2.
Sealing rings 5 are arranged between the upper end of the upper mandrel 4 and the inner wall of the body 2, between the centralizing block 11 and the body 2, between the outer wall of the lower mandrel 15 and the floating piston 19, between the floating piston 19 and the inner wall of the body 2, between the outer wall of the lower mandrel 15 and the inner and outer flow separation plates 20, and between the inner and outer flow separation plates 20 and the inner wall of the body 2.
A rectangular sealing ring 12 is arranged on the outer wall of the righting block 11.
A radial slurry flow passage is arranged on the body 2 between the floating piston 19 and the inner and outer flow separation plates 20.
The upper mandrel 4, the centralizing block 11, the floating piston 19 and the inner wall of the body 2 form an oil storage cavity, and lubricating oil is filled in the oil storage cavity.
In the initial state, the slurry pump is not started, drilling fluid is not circulated, the end part of the centralizing block 11 is flush with the outer wall of the body 2 where the centralizing block is installed, and at the moment, the embedding head 14c of the latch hook 14 is positioned at the contraction position 13e in the stroke control groove 13 d; starting a slurry pump, enabling drilling fluid to flow into the variable-diameter stabilizer from the drill string, enabling the drilling fluid to flow through other downhole tools such as the variable-diameter stabilizer and the screw drilling tool and a drill bit after the drilling fluid circulates, and returning upwards along a borehole annulus between the drill string and a well wall, so that at the position of the variable-diameter stabilizer, a pressure difference exists between the drilling fluid in the variable-diameter stabilizer and slurry in the borehole annulus; slurry in the well annulus can flow into a space formed by the floating piston 19, the inner and outer flow isolation plates 20, the lower mandrel 15 and the inner wall of the body 2 through a radial slurry flow channel between the floating piston 19 and the inner and outer flow isolation plates 20; because the upper end of the floating piston 19 is high-pressure lubricating oil and the lower end of the floating piston is low-pressure slurry, the floating piston 19 automatically adjusts the position, so that the pressure at the two ends is balanced, namely the pressure of the lubricating oil is always the same as the pressure in the well annulus, and is lower than the slurry pressure in the variable-diameter stabilizer; at the same time, the high-pressure drilling fluid pushes the driving sleeve 3 to move downwards together with the upper mandrel 4, the stroke control block 13 and the lower mandrel 15, the reset spring 6 is compressed, the wedge block 10 moves downwards together with the upper mandrel 4, and the centralizing block 11 is pushed to extend outwards; when the stroke control block 13 moves downwards, the embedded head 14c slides from the contracted position 13e to a stage of reducing position 13f, and in the process, the hook seat 18 slightly rotates as required; through the operation, the centralizing block 11 is extended to have the outer diameter larger than the outer diameter of the body 2, and a diameter-changing process is completed, wherein the overflow area between the lower mandrel 15 and the throttle rod 21 is reduced.
According to the drilling process, the pump is stopped, the pressure difference of fluid at two ends of the floating piston 19 is eliminated, the reset spring 6 drives the upper mandrel 4 to drive the wedge block 10 to move upwards, but due to the fact that the slope of the stroke control groove 13d has a non-return function, the embedding head 14c slides from the primary reducing position 13f to the primary locking position 13g, namely the embedding head 14c limits the stroke control block 13 and the upper mandrel 4 to move upwards, the centralizing block 11 is maintained in the primary reducing state, and the reset spring 6 is still in a compressed state.
When the pump is started for the second time, the driving sleeve 3 drives the upper mandrel 4, the stroke control block 13 and the lower mandrel 15 to move downwards, the reset spring 6 is further compressed, the stroke control block 13 moves downwards further, the embedding head 14c slides into the second-stage reducing position 13h from the first-stage locking position 13g, the upper mandrel 4 synchronously drives the wedge block 10 to move downwards and further pushes the centralizing block 11 outwards, the extending size of the centralizing block 11 is maximum, and the overflow area between the lower mandrel 15 and the throttle rod 21 is minimum.
When the pump is stopped for the second time, the pressure difference between two ends of the floating piston 19 is eliminated, the upper mandrel 4, the wedge block 10, the stroke control block 13 and the lower mandrel 15 are all moved upwards under the action of the return spring 6, the wedge block 10 drives the centralizing block 11 to shrink, so that the outer diameter of the centralizing block 11 is equal to the outer diameter of the body 2, and at the moment, the embedding head 14c slides from the secondary reducing position 13h to the shrinking position 13e.
The above-described embodiments are intended to illustrate the present invention and not to limit the scope of the invention, and any equivalent changes and modifications made by those skilled in the art will be within the scope of the present system without departing from the spirit and principles of the present invention.
Claims (5)
1. The variable diameter stabilizer for well track control is characterized by comprising a body (2), an upper mandrel (4), a stroke control block (13), a lower mandrel (15) and a hook seat (18), wherein the body (2) is hollow and cylindrical, the upper mandrel (4) is in threaded connection with the stroke control block (13), the stroke control block (13) is in threaded connection with the lower mandrel (15), a columnar assembly consisting of the upper mandrel (4), the stroke control block (13) and the lower mandrel (15) is arranged in the body (2) and is coaxial with the body (2), the hook seat (18) is arranged in the body (2) through a pin (8), the hook seat (18) limited by the pin (8) can rotate relative to the body (2) but cannot axially move relative to the body (2), a lock hook (14) is arranged between the stroke control block (13) and the hook seat (18), the lock hook (14) comprises a rotary hinge (14 a), a hook rod (14 b) and an embedding head (14 c), and the rotary hinge (14 a) is hinged on the hook seat (18) through a pin shaft (16); one side of the stroke control block (13) is provided with a stroke block longitudinal plane (13 c), the stroke block longitudinal plane (13 c) is parallel to the axis of the stroke control block (13), the stroke block longitudinal plane (13 c) is provided with a stroke control groove (13 d), the embedded head (14 c) slides in the stroke control groove (13 d), the stroke control groove (13 d) is internally provided with a shrinkage position (13 e), a primary reducing position (13 f), a primary locking position (13 g) and a secondary reducing position (13 h), and a slope is arranged on the path from the shrinkage position (13 e) to the primary reducing position (13 f), the primary reducing position (13 f) to the primary locking position (13 g) to the secondary reducing position (13 h) and is provided with a groove bottom plane with the same depth except for the slope arranged on the path, and the tail end of the slope is a step plane perpendicular to the groove bottom so as to form a reverse sliding prevention head (14 c); still be equipped with stroke piece oilhole (13 i) on stroke control block (13), stroke piece oilhole (13 i) and stroke control block (13) axis are parallel and run through stroke control block (13), the upper and lower both ends of stroke control block (13) are equipped with internal thread (13 a) and lower internal thread (13 b) respectively, threaded connection is passed through with the lower extreme of last dabber (4) in internal thread (13 a), threaded connection is passed through with the upper end of lower dabber (15) in lower internal thread (13 b).
2. A variable diameter stabilizer for wellbore trajectory control according to claim 1, characterized in that the upper mandrel (4), the stroke control block (13) and the lower mandrel (15) are all cylindrical and are all provided with hollow flow passages for circulating drilling fluid, the upper end outer diameter of the upper mandrel (4) is larger than the lower end outer diameter so as to form a step, the upper end of the body (2) is provided with a spring seat (7), a return spring (6) is arranged between the step of the upper mandrel (4) and the upper end of the spring seat (7), and the upper end of the upper mandrel (4) is provided with a driving sleeve (3) in a threaded connection manner.
3. The variable diameter stabilizer for well track control according to claim 1, wherein the hook seat (18) is provided with a positioning groove (18 a), a lug (18 b), a hook seat oil hole (18 c) and a pin shaft hole (18 d), the positioning groove (18 a) is an annular groove positioned at the periphery of the hook seat (18), the hook seat (18) is installed in the body (2) through a pin (8), the lug (18 b) is used for being connected with the rotary hinge (14 a) through a pin shaft (16), the hook seat oil hole (18 c) is parallel to the axis of the hook seat (18) and is used as a flow passage of lubricating oil at the upper end and the lower end of the hook seat (18), and the pin shaft hole (18 d) is formed in the lug (18 b) and is used for installing the pin shaft (16).
4. A variable diameter stabiliser for wellbore trajectory control according to claim 1, characterised in that a rubber spacer (17) is provided between the swivel hinge (14 a) and each lug (18 b), the pin (16) passing through the lug (18 b), the rubber spacer (17) and the swivel hinge (14 a).
5. A variable diameter stabiliser for use in wellbore trajectory control according to claim 1, characterised in that the upper mandrel (4) has a step in the middle, a plurality of wedges (10) being provided between the step in the middle of the upper mandrel (4) and the stroke control block (13), each wedge (10) being fitted with three centralising blocks (11), the centralising blocks (11) passing through radial holes in the middle of the body (2), the centralising blocks (11) moving in synchronism in the radial holes as the wedges (10) move axially along the body (2).
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| CN202210220664.3A CN114562220B (en) | 2022-03-08 | 2022-03-08 | Variable diameter stabilizer for well track control |
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| CN202210220664.3A CN114562220B (en) | 2022-03-08 | 2022-03-08 | Variable diameter stabilizer for well track control |
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| CN115506727B (en) * | 2022-11-08 | 2023-04-07 | 大庆市璞庆钻采设备制造有限公司 | Diameter-variable drilling tool stabilizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6328119B1 (en) * | 1998-04-09 | 2001-12-11 | Halliburton Energy Services, Inc. | Adjustable gauge downhole drilling assembly |
| GB2347443B (en) * | 1999-03-05 | 2003-03-26 | Cutting & Wear Resistant Dev | Adjustable down-hole tool |
| CN2424293Y (en) * | 2000-05-10 | 2001-03-21 | 石油勘探开发科学研究院钻井工艺研究所 | Positive output volume remote control diameter variable stabilizer |
| NO20053684A (en) * | 2005-08-01 | 2006-12-18 | Well Innovation As | Adjustable centering tool for use in pipes with different inner diameters |
| GB201307695D0 (en) * | 2013-04-26 | 2013-06-12 | Simpson Neil A A | Expandable Stabilizer |
| CN104847265A (en) * | 2015-05-27 | 2015-08-19 | 长江大学 | Cylindroid telescopic reducing drilling tool |
| CN106368621B (en) * | 2016-11-28 | 2019-02-12 | 长江大学 | A kind of multistage variable diameter stabilizer |
| CN108952578B (en) * | 2018-07-20 | 2019-10-01 | 西南石油大学 | A kind of drilling remote control variable gauge stabilizer |
| CN110847822A (en) * | 2019-12-24 | 2020-02-28 | 西南石油大学 | Remote control diameter-variable stabilizer |
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| Title |
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| KWQ-216型地面可控井下变径稳定器;祝效华;刘少胡;聂荣国;汤历平;敬俊;李礼;;石油钻采工艺;20110115(01);全文 * |
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