Two-stage plunger telescopic underground pushing device

Abstract

The invention relates to the technical field of underground pushing devices, in particular to a two-stage plunger telescopic type underground pushing device which comprises an outer cylinder and pushing devices, three mounting holes which are through inside and outside are evenly distributed in the outer cylinder along the circumference, each mounting hole is internally provided with one pushing device, each pushing device comprises a driving assembly and a pushing plate assembly, and the pushing plate assemblies are movably connected in the mounting holes. The push plate assembly comprises an upper push plate, a main push plate and a lower push plate which are sequentially and movably connected together from top to bottom, and a driving assembly is arranged in the push plate assembly. The device is reasonable and compact in structure and convenient to use, the upper push plate and the lower push plate are movably connected with the main push plate, the movement range of the main push plate can be limited, the driving assembly pushes the main push plate to move outwards to abut against the well wall, and the three sets of pushing devices push the outer barrel to be located in the middle of the well wall under the counter-acting force of the well wall; the driving assembly can solve the problem that a vertical drilling tool cannot be effectively pushed against the well wall due to serious borehole diameter expansion.

Description

Technical Field

[0001] The invention relates to the technical field of downhole pushing and leaning devices, in particular to a double-stage plunger telescopic downhole pushing and leaning device. Background Art

[0002] With the development of drilling speed-up technology, drilling through multiple formations in one trip has become the norm. The application of vertical drilling tools has also formed a multi-combination application mode such as "vertical drilling + screw", "vertical drilling + twisting punch", etc., which has achieved good anti-deflection and speed-up effects. However, in some areas, due to the large difference in the hardness and softness of the formations, the upper formation is too soft, the machine speed reaches more than 30m / h, and the circulation displacement reaches 80L / s at the same time, the wellbore diameter is seriously expanded, and the vertical drilling tool cannot be effectively pushed against the well wall, resulting in the loss of the vertical drilling tool. The borehole diameter of the lower hard formation is small. In order to ensure the safety of the operation and not cause support pressure, the size of the push position of the vertical drilling tool should not be too large, otherwise it will cause serious support pressure or even stuck. Vertical drilling tools face the problem of limited application areas and formations, which seriously restricts the application of vertical drilling tools and on-site drilling speed-up, and cannot meet on-site drilling needs. Summary of the invention

[0003] The present invention provides a two-stage plunger telescopic downhole pushing device, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem that the existing pushing device for serious wellbore expansion cannot effectively push against the well wall.

[0004] The technical solution of the present invention is achieved through the following measures: a two-stage plunger telescopic downhole pushing device, including an outer cylinder and a pushing device, three mounting holes that penetrate inside and outside are evenly distributed along the circumference of the outer cylinder, and a pushing device is provided in each mounting hole. The pushing device includes a driving assembly and a push plate assembly, and a push plate assembly is movably connected in the mounting hole. The push plate assembly includes an upper push plate, a main push plate and a lower push plate that are movably connected together from top to bottom in sequence, and a driving assembly is provided in the push plate assembly, and the driving assembly can push the main push plate to move outward.

[0005] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned upper push plate can be hinged with the outer cylinder through a fixed pin shaft, the main push plate is cross-shaped, the lower part of the upper push plate and the upper part of the lower push plate are matched with the upper part and the lower part of the main push plate respectively, the upper part and the lower part of the main push plate are provided with left and right through sliding grooves, and sliding pin shafts are provided in the sliding grooves, the two ends of the sliding pin shaft located at the upper part are hinged with the lower part of the upper push plate, and the two ends of the sliding pin shaft located at the lower part are hinged with the upper part of the lower push plate, a boss is integrally provided at the lower end of the lower push plate, and a movable groove opening upward is provided on the outer cylinder corresponding to the lower side of the mounting hole, and the boss is located in the movable groove.

[0006] The above-mentioned driving assembly may include a mounting block, a pump, a liquid cylinder sleeve and a two-stage plunger. The push plate assembly is provided with a mounting block, a cavity is provided at the upper part of the mounting block, a pump and hydraulic oil are provided in the cavity, an electronic compartment is provided on the inner side of the upper part of the outer cylinder, a control circuit connected to the pump through a wire is provided in the electronic compartment, a mounting groove is provided at the lower part of the mounting block, a liquid cylinder sleeve is provided in the mounting groove, and a two-stage plunger that can extend outward is provided in the liquid cylinder sleeve.

[0007] The above-mentioned two-stage plunger may include an external plunger and an intermediate plunger. The external plunger is located in the liquid cylinder sleeve, and a first stop platform is integrally provided on the inner side of the upper end of the liquid cylinder sleeve, and a first limit platform is integrally provided on the outer side of the lower end of the external plunger. An intermediate plunger is arranged in the external plunger, and a second stop platform is integrally provided on the inner side of the upper end of the external plunger, and a second limit platform is integrally provided on the outer side of the lower end of the intermediate plunger.

[0008] The above may also include a cover plate and a rubber sleeve. The cover plate is provided at the outer side of the cylinder sleeve, and a rubber sleeve is vulcanized on the inner side of the outer end of the cover plate. The rubber sleeve is folded and placed between the installation groove and the cylinder sleeve, and the lower end of the rubber sleeve is fixed to the cylinder sleeve by screws.

[0009] A limit block may be integrally provided at the middle portion of the outer side of the cover plate, a groove is provided on the inner side of the main push plate corresponding to the position of the limit block, and the outer end of the limit block is located in the groove.

[0010] The above may also include a limit spring, and the limit spring is detachably connected between the lower end of the mounting block and the inner side of the lower push plate.

[0011] The present invention has a reasonable and compact structure and is easy to use. An upper push plate and a lower push plate are movably connected with the main push plate, which can limit the movable range of the main push plate. The driving component pushes the main push plate to move outward to support the well wall. The three groups of pushing devices push the outer tube under the reaction force of the well wall to make it located in the center of the wellbore. The driving component can overcome the problem that the vertical drilling tool cannot be effectively pushed against the well wall due to severe wellbore expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 It is a schematic diagram of a partial cross-sectional structure of a front view of an embodiment of the present invention.

[0013] Attached Figure 2 For attachment Figure 1 Schematic diagram of the right-side enlarged partial cross-sectional structure of the middle push plate assembly.

[0014] The codes in the accompanying drawings are: 1 for the outer cylinder, 2 for the control circuit, 3 for the wire, 4 for the electronic compartment, 5 for the upper push plate, 6 for the fixed pin shaft, 7 for the mounting block, 8 for the pump, 9 for the main push block, 10 for the cylinder sleeve, 11 for the intermediate plunger, 12 for the outer plunger, 13 for the cover plate, 14 for the sliding pin shaft, 15 for the slide groove, 16 for the limit spring, 17 for the lower push plate, 18 for the rubber sleeve, 19 for the boss, and 20 for the limit block. DETAILED DESCRIPTION

[0015] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0016] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0017] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 , 2 As shown, the two-stage plunger telescopic downhole pushing device includes an outer tube 1 and a pushing device. Three mounting holes that penetrate inside and outside are evenly distributed along the circumference of the outer tube 1. A pushing device is provided in each mounting hole. The pushing device includes a driving assembly and a push plate assembly. A push plate assembly is movably connected in the mounting hole. The push plate assembly includes an upper push plate 5, a main push plate and a lower push plate 17 that are movably connected together from top to bottom in sequence. A driving assembly is provided in the push plate assembly, and the driving assembly can push the main push plate to move outward.

[0018] The present invention has a reasonable and compact structure and is easy to use. The upper push plate 5 and the lower push plate 17 are movably connected with the main push plate, which can limit the movable range of the main push plate. The driving component pushes the main push plate to move outward to support the well wall. The three groups of pushing devices extend the main push plate outward and push the outer tube 1 to be located in the center of the wellbore under the reaction force of the well wall. The driving component can overcome the problem that the vertical drilling tool cannot be effectively pushed against the well wall due to severe wellbore expansion.

[0019] The above-mentioned two-stage plunger telescopic downhole pushing device can be further optimized and / or improved according to actual needs: Embodiment 2: As attached Figure 1 , 2 As shown, the upper push plate 5 is hinged to the outer cylinder 1 through the fixed pin 6, the main push plate is in a cross shape, the lower part of the upper push plate 5 and the upper part of the lower push plate 17 are matched with the upper and lower parts of the main push plate respectively, the upper and lower parts of the main push plate are provided with left and right through slide grooves 15, and the slide grooves 15 are provided with sliding pins 14, the two ends of the sliding pin 14 located at the upper part are hinged to the lower part of the upper push plate 5, and the two ends of the sliding pin 14 located at the lower part are hinged to the upper part of the lower push plate 17, and a boss 19 is integrally provided at the lower end of the lower push plate 17, and a movable groove with an opening upward is provided on the outer cylinder 1 corresponding to the lower side of the mounting hole, and the boss 19 is located in the movable groove.

[0020] During use, when the driving assembly pushes the main push plate, the sliding pin 14 on the main push plate moves along the slide groove 15 when the main push plate extends outward, and the extension distance of the main push plate is limited by the length of the slide groove 15. The upper push plate 5 and the lower push plate 17 have a certain range of motion, which can prevent the main push plate from getting stuck when extending outward.

[0021] Embodiment 3: As attached Figure 1 As shown, the driving assembly includes a mounting block 7, a pump 8, a liquid cylinder sleeve 10 and a two-stage plunger. The mounting block 7 is provided in the push plate assembly, and a cavity is provided on the upper part of the mounting block 7. The pump 8 and hydraulic oil are provided in the cavity. An electronic compartment 4 is provided on the inner side of the upper part of the outer cylinder 1. The control circuit 2 connected to the pump 8 through a wire 3 is provided in the electronic compartment 4. A mounting groove is provided at the lower part of the mounting block 7. The liquid cylinder sleeve 10 is provided in the mounting groove. The two-stage plunger that can extend outward is provided in the liquid cylinder sleeve 10.

[0022] When in use, the control circuit 2 controls the start and stop of the pump 8, and the high-pressure oil at the output port of the pump 8 enters the two-stage plunger, pushing the two-stage plunger to extend outward, thereby pushing the main push plate to extend outward.

[0023] Embodiment 4: As attached Figure 1 As shown, the two-stage plunger includes an external plunger 12 and an intermediate plunger 11. The external plunger 12 is located in the cylinder sleeve 10. A first stop is integrally provided on the inner side of the upper end of the cylinder sleeve 10, and a first limit platform is integrally provided on the outer side of the lower end of the external plunger 12. An intermediate plunger 11 is arranged in the external plunger 12. A second stop is integrally provided on the inner side of the upper end of the external plunger 12, and a second limit platform is integrally provided on the outer side of the lower end of the intermediate plunger 11.

[0024] The high-pressure oil at the output port of the pump 8 pushes the external plunger 12 to extend outward. Under the restrictions of the first stop and the first limit platform, the external plunger 12 will not fall out of the cylinder sleeve 10. The high-pressure oil pushes the intermediate plunger 11 to extend outward. Under the restrictions of the second stop and the second limit platform, the intermediate plunger 11 will not fall out of the external plunger 12. By setting the two-stage plunger to be small in size and large in extension range, a wide range of wellbore sizes within a limited tool size range can be adapted to the downhole, solving the problems of soft formations being unable to be effectively pushed against and vertical drilling tools failing to strengthen drilling parameters to achieve speed increase. At the same time, the problem of severe support pressure on hard formations is avoided, and automatic adaptation to soft and hard formations and large and small wellbore diameters is achieved.

[0025] Embodiment 5: As attached Figure 1 As shown, it also includes a cover plate 13 and a rubber sleeve 18. The cover plate 13 is provided at the outer side of the cylinder sleeve 10, and the rubber sleeve 18 is vulcanized on the inner side of the outer end of the cover plate 13. The rubber sleeve 18 is folded and placed between the installation groove and the cylinder sleeve 10. The lower end of the rubber sleeve 18 is fixed to the cylinder sleeve 10 by screws.

[0026] The rubber sleeve 18 can be provided to seal the two-stage plunger to prevent impurities from entering and causing the plunger to be blocked from extending.

[0027] Embodiment 6: As attached Figure 1 As shown, a limit block 20 is integrally provided at the middle of the outer side of the cover plate 13 , a groove is provided on the inner side of the main push plate corresponding to the position of the limit block 20 , and the outer end of the limit block 20 is located in the groove.

[0028] The limiting block 20 can prevent the cover plate 13 from moving and limit the position of the cover plate 13 .

[0029] Embodiment 7: As attached Figure 1 As shown, a limit spring 16 is also included, and a limit spring 16 is detachably connected between the lower end of the mounting block 7 and the inner side of the lower push plate 17. The limit spring 16 can replicate the reset of the push plate assembly and can also prevent the push plate assembly from extending out by mistake.

[0030] The present invention relies on the split design of the plunger to realize the two-stage telescopic design and the telescopic sliding design of the push plate, so as to achieve good adaptation to the range of well diameters, effective pushing for large expansion, and no pressure for small expansion. The limited tool allows the design size space to solve the problem that the vertical drilling tool in soft formations cannot be effectively pushed, and avoids the problem of small pressure for the well diameter in the lower hard formation. The magnitude of the pushing force is controlled and adjusted by controlling the output force of the power component through the control circuit 2. The extension size range of the push is adapted to well diameters of different sizes through the expansion of the plunger and the mutual sliding of the three push plates, which can meet the needs of the effectiveness of the vertical drilling tool for pushing through multiple formations in one drilling. The vertical drilling tool is supported for multiple combinations such as vertical drilling + screw, vertical drilling + torsion punching. In the design process, maintenance, installation, downhole wear, etc. during the application process are fully considered, and differentiated process technologies such as pin shaft insertion, laser cladding hardening of the main push block 9, and surface carburization of the upper and lower push plates are adopted, which has the characteristics of simple installation, convenient maintenance, and good economy.

[0031] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A two-stage plunger telescopic downhole pushing device, characterized in that It includes an outer cylinder and a pushing device. Three mounting holes that penetrate inside and outside are evenly distributed along the circumference of the outer cylinder. Each mounting hole is provided with a pushing device. The pushing device includes a driving assembly and a push plate assembly. The mounting hole is movably connected with a push plate assembly. The push plate assembly includes an upper push plate, a main push plate and a lower push plate that are movably connected together from top to bottom. A driving assembly is provided in the push plate assembly, and the driving assembly can push the main push plate to move outward.

2. The two-stage plunger telescopic downhole pushing device according to claim 1 is characterized in that The upper push plate is hinged to the outer cylinder through a fixed pin, and the main push plate is cross-shaped. The lower part of the upper push plate and the upper part of the lower push plate are matched with the upper part and the lower part of the main push plate respectively. The upper and lower parts of the main push plate are provided with sliding grooves that pass through left and right, and sliding pins are provided in the sliding grooves. Both ends of the sliding pin located at the upper part are hinged to the lower part of the upper push plate, and both ends of the sliding pin located at the lower part are hinged to the upper part of the lower push plate. A boss is integrally provided at the lower end of the lower push plate, and an active groove with an opening upward is provided on the outer cylinder corresponding to the lower side of the mounting hole, and the boss is located in the active groove.

3. The two-stage plunger telescopic downhole pushing device according to claim 1 or 2, characterized in that The driving assembly includes a mounting block, a pump, a cylinder sleeve and a two-stage plunger. The push plate assembly is provided with a mounting block, a cavity is provided on the upper part of the mounting block, a pump and hydraulic oil are provided in the cavity, an electronic compartment is provided on the inner side of the upper part of the outer cylinder, a control circuit connected to the pump through a wire is provided in the electronic compartment, a mounting groove is provided at the lower part of the mounting block, a cylinder sleeve is provided in the mounting groove, and a two-stage plunger that can extend outward is provided in the cylinder sleeve.

4. The two-stage plunger telescopic downhole pushing device according to claim 3 is characterized in that The two-stage plunger includes an external plunger and an intermediate plunger. The external plunger is located in the liquid cylinder sleeve. A first stop is integrally provided on the inner side of the upper end of the liquid cylinder sleeve, and a first limit platform is integrally provided on the outer side of the lower end of the external plunger. An intermediate plunger is arranged in the external plunger. A second stop is integrally provided on the inner side of the upper end of the external plunger, and a second limit platform is integrally provided on the outer side of the lower end of the intermediate plunger.

5. The two-stage plunger telescopic downhole pushing device according to claim 3 is characterized in that It also includes a cover plate and a rubber sleeve. The cover plate is arranged at the outer side of the cylinder sleeve. The rubber sleeve is vulcanized on the inner side of the outer end of the cover plate. The rubber sleeve is folded and placed between the installation groove and the cylinder sleeve. The lower end of the rubber sleeve is fixed to the cylinder sleeve by screws.

6. The two-stage plunger telescopic downhole pushing device according to claim 4 is characterized in that It also includes a cover plate and a rubber sleeve. The cover plate is arranged on the outer side of the cylinder sleeve, and a rubber sleeve is vulcanized on the cover plate. The rubber sleeve is folded and placed between the mounting groove and the cylinder sleeve, and the lower end of the rubber sleeve is fixed to the cylinder sleeve by screws.

7. The two-stage plunger telescopic downhole pushing device according to claim 5 or 6, characterized in that A limit block is integrally provided at the middle of the outer side of the cover plate, a groove is provided on the inner side of the main push plate corresponding to the position of the limit block, and the outer end of the limit block is located in the groove.

8. The two-stage plunger telescopic downhole pushing device according to claim 3 is characterized in that It also includes a limit spring, which is detachably connected between the lower end of the mounting block and the inner side of the lower push plate.

9. The two-stage plunger telescopic downhole pushing device according to claim 4, 5 or 6, characterized in that It also includes a limit spring, and a limit spring is detachably connected between the lower end of the mounting block and the inner side of the lower push plate.

Images