CN110644940A - Mechanical and electric cutting device for single-cylinder double-well casing of oil well - Google Patents

Abstract

The invention discloses a mechanical electric cutting device for a single-cylinder double-well casing of an oil well, which comprises a first anchoring mechanism (2), a rotary joint (3), a cutting mechanism (4), a speed reducer (6), a driving motor (7) and a second anchoring mechanism (8) which are sequentially arranged, wherein the cutting mechanism (4) comprises a cutting knife (45), and the driving motor (7) can drive the cutting knife (45) to rotate and cut. This oil well single-cylinder twin-well casing machinery electricity cutting device can effectively avoid single-cylinder twin-well casing cutting to receive the orbit of two wells and the influence of well bore structure, and its easy operation, the success rate is high, need not complicated ground power supply, adopts pure mechanical system cutting, has powerfully protected marine ecological environment, and the cutting operation is high-efficient, can guarantee that follow-up operation goes on safely smoothly to realize the high-efficient development of marine oil safety.

Description

Mechanical and electric cutting device for single-cylinder double-well casing of oil well

Technical Field

The invention relates to the field of oil exploitation equipment, in particular to a mechanical electric cutting device for a single-cylinder double-well casing of an oil well.

Background

In recent years, the traditional single-cylinder twin-well drilling technology is mature day by day in Bohai sea, but still has a plurality of problems. For example, due to the influences of the tracks (collision prevention, deflecting points, surface finish drilling depth and the like) of two wells and the structure of a well body, the traditional abrasive jet flow construction is difficult, long in period and high in cost. Meanwhile, in the existing underground well repairing technology, casing cutting mainly comprises hot cutting and cold cutting, most of the hot cutting adopts a chemical mode, so that the danger is high, the operation is difficult, the success rate is low, and the environment is easily polluted. The cold cutting adopts a physical cutting knife mode, is environment-friendly, has various specific implementation forms, is mainly conveyed by a drill rod and an oil pipe at present, is used for connecting a cutting tool to the bottoms of the drill rod and the oil pipe, generates thrust through hydraulic pressure, is in contact with the inner wall of a casing pipe, rotates a drilling tool to drive the cutting knife to rotate, and completes cutting.

Disclosure of Invention

In order to solve the problem of low success rate of the existing casing cutting tool, the invention provides the mechanical and electric cutting device for the single-cylinder double-well casing of the oil well, which can effectively avoid the cutting of the single-cylinder double-well casing from being influenced by the tracks of two wells and the well body structure, has simple operation and high success rate, does not need a complicated ground power source, adopts a pure mechanical cutting mode, powerfully protects the marine ecological environment, has high cutting efficiency, can ensure the safe and smooth follow-up operation, and realizes the safe and high-efficiency development of marine oil.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides an oil well single-cylinder double well casing pipe machinery electricity cutting device, includes first anchoring mechanism, rotary joint, cutting mechanism, reduction gear, driving motor and the second anchoring mechanism that sets gradually, and cutting mechanism contains the cutting knife, and driving motor can drive the cutting knife rotary cutting.

The first anchoring mechanism comprises an anchoring shell, a piston, a tension claw and a supporting rod, wherein the tension claw is positioned outside the anchoring shell, the piston is sleeved in the anchoring shell, and the tension claw is connected with the piston through the supporting rod.

The piston contains pole portion and head, and the head of piston is equipped with the cylindric hydraulic pressure cavity towards rotary joint between the head of piston and the anchoring shell, is equipped with the axial pressure chamber in the hydraulic pressure cavity, and when filling pressure liquid into this axial pressure chamber, the rotary joint can be kept away from along the axial of anchoring shell to the piston.

The cover is equipped with cylindric piston cavity between the pole portion of piston and the anchoring shell, be equipped with top spring in the piston cavity, top spring can make the piston be close to rotary joint along the axial of anchoring shell, the one end of bracing piece is passed through the pin and is connected with the tension claw, the other end of bracing piece and the contact segment butt of the pole portion of piston, when the axial of piston along the anchoring shell is close to rotary joint, the contact segment of the pole portion of piston can promote bracing piece and tension claw and follow the radial axis of keeping away from the anchoring shell of anchoring shell.

The contact section of the rod portion of the piston is in the shape of a conical cylinder, the top end of the conical cylinder faces the rotary joint, and the first anchoring mechanism further comprises a positioning assembly, and the positioning assembly enables the piston to be fixed relative to the anchoring shell along the axial direction of the anchoring shell.

The locating component contains the serration plate, inserts the nail and inserts the nail spring, and outside the serration plate was fixed in the pole portion of piston, the surface of serration plate was towards piston cavity, and the surface of serration plate was equipped with a plurality of sawteeth, the axial arrangement of piston is followed to a plurality of sawteeth, and the one end of inserting the nail is located piston cavity, and the other end of inserting the nail matches with the surface of serration plate and pegs graft, inserts the nail spring and can provide the restoring force along anchoring shell radial movement for inserting the nail.

Cutting mechanism still contains interior endotheca and establishes adversion body and shell body, and the tail end of cutting knife is located the adversion internally, and the cover is equipped with cylindric cutter hydraulic pressure cavity between the tail end of cutting knife and the adversion body, is equipped with radial pressure chamber in the cutter hydraulic pressure cavity, and the internal central axial passageway that is equipped with of adversion, radial pressure chamber and central axial passageway intercommunication.

Cutting mechanism still contains the end cover, the tip of adversion body and the tip of shell body all are connected with the end cover, the tip overcoat of adversion body is equipped with the outer gear, contain radial passage in the end cover, radial passage's exit end is located the central authorities of end cover, radial passage's entry end is located the edge of end cover, radial passage's exit end and central axial passage's entry end intercommunication, the output shaft of reduction gear passes the end cover, the axis of the output shaft of reduction gear is parallel with the axis of adversion body, the outer pot head of the output shaft of reduction gear is equipped with first gear, first gear and external gear meshing, the axis of adversion body and.

The axis of the outer shell, the axis of the inner rotary body and the axis of the central axial passage coincide, the first anchoring mechanism is connected with a first pressure liquid supply pipeline, the first pressure liquid supply pipeline sequentially penetrates through the radial passage and the central axial passage, the inner diameter of the radial passage and the inner diameter of the central axial passage are both larger than the outer diameter of the first pressure liquid supply pipeline, and the first pressure liquid supply pipeline is connected with the inner rotary body in a sealing mode.

The first anchoring mechanism is externally provided with a protective cap, the first anchoring mechanism and the second anchoring mechanism are identical in structure and are mirror images of each other, and the second anchoring mechanism is externally sequentially connected with a first centralizer, a first connecting short section, a magnetic positioner, a second connecting short section and a second centralizer.

The invention has the beneficial effects that:

1. the pure mechanical mode need not complicated ground power supply, and the cutting action only needs a high-power motor can provide required power, reduces the fault rate, protects marine ecological environment.

2. The instrument has small outer diameter and large cutting controllable range, can be lowered into an oil pipe and a drill rod for cutting, and can quickly recover drilling work, save offshore operation time and improve economic benefits when a cutter is lowered into the oil pipe and the drill rod for cutting during the drilling process.

3. The cutter is convenient to replace, the operation is simple and convenient, the cutting operation is accurate and efficient, and the construction cost is low.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

FIG. 1 is a front view of the mechanical electrical cutting apparatus for single-barrel double-well casing of an oil well according to the present invention.

FIG. 2 is a left side view of the oil well single-barrel double-well casing mechanical electric cutting device of the present invention.

Fig. 3 is a cross-sectional view of the first anchoring mechanism taken along the line a-a in fig. 1.

Fig. 4 is a sectional view of the cutting mechanism and the decelerator in a direction a-a of fig. 1.

Fig. 5 is a schematic view of fig. 2 with the addition of hydraulic lines.

Fig. 6 is a schematic view of a pipe joint.

1. A protective cap; 2. a first anchoring mechanism; 3. a rotary joint; 4. a cutting mechanism; 6. a speed reducer; 7. a drive motor; 8. a second anchoring mechanism; 9. a first centralizer; 10. a first connection nipple; 11. a magnetic locator; 12. a second connection sub; 13. a second centralizer;

21. an anchor housing; 221. a piston cavity; 222. a hydraulic cavity; 23. a piston; 231. a serrated plate; 24. a top spring; 25. a tension claw; 26. a pin; 27. a support bar; 28. a plug pin spring; 29. inserting a nail; 210. a first pressure fluid supply line;

41. an outer housing; 42. an inner rotating body; 421. a central axial passage; 43. an end cap; 431. a radial channel; 44. a hydraulic cavity; 45. a cutting knife; 46. an outer gear; 47. a connecting cylinder;

61. an output shaft; 62. a first gear; 63. a fourth gear; 64. an outer cylinder; 65. an inner cylinder; 66. an input shaft; 67. a second gear; 68. a third gear; 69. a liquid supply channel;

81. a second pressure fluid supply line;

131. a pipe joint; 132. and a liquid injection port.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The utility model provides an oil well single-cylinder double well casing pipe machinery electricity cutting device, includes from the top down first anchoring mechanism 2, rotary joint 3, cutting mechanism 4, reduction gear 6, driving motor 7 and the second anchoring mechanism 8 that connects gradually, and cutting mechanism 4 contains cutting knife 45, and driving motor 7 can drive cutting knife 45 rotatory cutting casing pipe, as shown in fig. 1 and fig. 2.

In this embodiment, the first anchoring mechanism 2 includes an anchoring housing 21, a piston 23, a tension claw 25 and a support rod 27, the anchoring housing 21 is sleeved outside the piston 23, an axis of the anchoring housing 21 coincides with an axis of the piston 23, the tension claw 25 is located outside the anchoring housing 21, the tension claw 25 is used for being firmly connected with a sleeve, the piston 23 is sleeved inside the anchoring housing 21, the tension claw 25 is connected with the piston 23 through the support rod 27, and the piston 23 can move along the axis direction of the anchoring housing 21. When the piston 23 moves in the axial direction of the anchor housing 21, the tension claw 25 can move in the diameter direction of the anchor housing 21.

In the present embodiment, the piston 23 includes a rod portion and a head portion, the rod portion of the piston 23 faces upward, and the head portion of the piston 23 faces downward, that is, the head portion of the piston 23 faces the rotary joint 3. A cylindrical hydraulic cavity 222 is sleeved between the head of the piston 23 and the anchoring housing 21, the axis of the hydraulic cavity 222 coincides with the axis of the anchoring housing 21, the hydraulic cavity 222 is fixedly connected with the anchoring housing 21, an axial pressure cavity is arranged in the hydraulic cavity 222, and when pressure liquid is injected into the axial pressure cavity, the piston 23 can be far away from the rotary joint 3 along the axial direction of the anchoring housing 21, that is, the piston 23 can move upwards, as shown in fig. 3.

In this embodiment, a cylindrical piston cavity 221 is sleeved between the rod portion of the piston 23 and the anchoring housing 21, the upper end of the piston cavity 221 is closed, the lower end of the piston cavity 221 is open, the axis of the piston cavity 221 coincides with the axis of the anchoring housing 21, the piston cavity 221 is fixedly connected with the anchoring housing 21, and the piston cavity 221 and the hydraulic cavity 222 are vertically arranged. A top spring 24 is provided in the piston chamber 221, the top spring 24 is located between the upper end of the piston 23 and the upper end of the piston chamber 221, the top spring 24 can make the piston 23 approach the rotary joint 3 along the axial direction of the anchor housing 21, that is, the top spring 24 can make the piston 23 move downward, as shown in fig. 3.

In this embodiment, the outer end of the supporting rod 27 is hinged to the tension claw 25 by a pin 26, the axis of the pin 26 is perpendicular to the axis of the anchoring housing 21, the inner end of the supporting rod 27 abuts against the contact section of the rod part of the piston 23, the supporting rod 27 passes through the anchoring housing 21 and the piston cavity 221, and the supporting rod 27 is arranged along the radial direction of the anchoring housing 21. When the piston 23 approaches the rotary joint 3 in the axial direction of the anchor housing 21, the contact section of the rod portion of the piston 23 can push the support rod 27 and the tension claws 25 away from the axis of the anchor housing 21 in the radial direction of the anchor housing 21, so that the tension claws 25 are in an open state.

In the present embodiment, the contact section of the rod portion of the piston 23 is a conical cylinder, the contact section is located at the middle upper portion of the rod portion of the piston 23, the top end of the conical cylinder faces downward, the bottom end of the conical cylinder faces upward, that is, the top end of the conical cylinder faces the rotary joint 3. The first anchoring mechanism 2 also contains a positioning assembly that enables the piston 23 to be fixed relative to the anchoring housing 21 in the axial direction of the anchoring housing 21.

In this embodiment, the positioning assembly includes a serrated plate 231, a plug pin 29 and a plug pin spring 28, the serrated plate 231 is fixed outside the rod portion of the piston 23, the outer surface of the serrated plate 231 faces the piston cavity 221, the outer surface of the serrated plate 231 is provided with a plurality of serrations which are arranged along the axial direction of the anchoring housing 21, one end of the plug pin 29 is located in the piston cavity 221, the other end of the plug pin 29 is provided with a sharp corner, the other end of the plug pin 29 is inserted into the outer surface of the serrated plate 231 in a matching manner, the plug pin 29 can move along the radial direction of the anchoring housing 21, the plug pin spring 28 is located between the piston cavity 221 and the plug pin 29, and the plug pin spring 28 can provide a restoring force for the plug pin 29 to move along the radial direction of the anchoring housing 21.

In this embodiment, the cutting mechanism 4 further comprises an inner rotating body 42 and an outer shell 41 which are sleeved with each other, the tail end of the cutting knife 45 is positioned in the inner rotating body 42, the head end of the cutting knife 45 is positioned outside the outer shell 41, and the head end of the cutting knife 45 is provided with a cutting edge. The cover is equipped with cylindric cutter hydraulic chamber 44 between the tail end of cutting knife 45 and the interior turning body 42, is equipped with radial pressure chamber in the cutter hydraulic chamber 44, and cutting knife 45 can be followed the radial movement of shell body 41, is equipped with central axial passage 421 in the interior turning body 42, radial pressure chamber and central axial passage 421 intercommunication. When pressure fluid is injected into the central axial passage 421, the pressure fluid can enter the radial pressure chamber and move the cutting knife 45 away from the axis of the inner rotary body 42 along the radial direction of the inner rotary body 42, i.e., the cutting knife 45 on the left side in fig. 4 will move to the left, i.e., the cutting knife 45 on the right side in fig. 4 will move to the right.

Specifically, the axis of the outer shell 41, the axis of the inner rotating body 42 and the axis of the anchoring outer shell 21 coincide, the cutting knife 45 is in a long strip-shaped structure, the length direction of the cutting knife 45 is the same as the diameter direction of the outer shell 41, a pipeline installation through hole is formed in the upper portion of the inner rotating body 42, the axis of the pipeline installation through hole, the axis of the central axial passage 421 and the axis of the inner rotating body 42 coincide, the pipeline installation through hole and the central axial passage 421 are communicated up and down and penetrate through the inner rotating body 42, and the inner diameter of the pipeline installation through hole is smaller than the inner diameter of the central axial. To facilitate radial retraction of the cutting blade 45, a spring may be provided within the tool hydraulic chamber 44 that provides a restoring force to the cutting blade 45.

In this embodiment, the cutting mechanism 4 further includes an end cover 43, the end cover 43 is located at the lower end of the cutting mechanism 4, the inner rotating body 42 is fixedly connected to the outer housing 41, the lower end of the inner rotating body 42 and the lower end of the outer housing 41 are both connected to the end cover 43, an external gear 46 is sleeved outside the lower end of the inner rotating body 42, a radial passage 431 is contained in the end cover 43, an outlet end of the radial passage 431 is located in the center of the upper surface of the end cover 43, an inlet end of the radial passage 431 is located at the edge of the lower surface of the end cover 43, an outlet end of the radial passage 431 is communicated with an inlet end of the central axial passage 421.

In this embodiment, the speed reducer 6 includes an outer cylinder 64, an inner cylinder 65, an output shaft 61, and an input shaft 66, the outer cylinder 64 and the inner cylinder 65 may be connected by a bearing, the inner cylinder 65 may rotate around an axis of the inner cylinder 65, inner teeth are provided on an inner surface of the inner cylinder 65, and the end cover 43 is connected and fixed to the outer cylinder 64, for example, the end cover 43 is connected and fixed to the outer cylinder 64 by a screw. The axis of the input shaft 66 is parallel to the axis of the output shaft 61, the axis of the output shaft 61 is offset from the axis of the input shaft 66, and the axis of the input shaft 66 coincides with the axis of the inner rotary body 42. The second gear 67, the third gear 68, the inner cylinder 65, and the fourth gear 63 are sequentially meshed and connected, and the input shaft 66 can rotate the output shaft 61 sequentially through the second gear 67, the third gear 68, the inner cylinder 65, and the fourth gear 63, as shown in fig. 4.

An output shaft 61 of the speed reducer 6 penetrates through the end cover 43, the output shaft 61 is in clearance fit with the end cover 43, the axis of the output shaft 61 of the speed reducer 6 is parallel to the axis of the inner rotating body 42, a first gear 62 is sleeved on the outer end of the output shaft 61 of the speed reducer 6, the first gear 62 is meshed with the outer gear 46, and the inner rotating body 42 and the outer shell 41 can rotate by taking the axis of the inner rotating body 42 as a shaft. The input shaft 66 of the reducer 6 is coaxially and fixedly connected with the driving motor 7, the outer cylinder 64 of the reducer 6 is fixedly connected with the shell of the driving motor 7, when the driving motor 7 drives the input shaft 66 of the reducer 6 to rotate, the output shaft 61 also rotates along with the input shaft 66, and the inner rotor 42 and the outer shell 41 are driven to rotate by the first gear 62 and the outer gear 46 around the axis of the inner rotor 42, but at the moment, the outer cylinder 64 and the end cover 43 are both kept static (neither moving nor rotating).

In the present embodiment, the axis of the outer housing 41, the axis of the inner rotary body 42 and the axis of the central axial passage 421 coincide, the first anchoring mechanism 2 is connected with the first pressure fluid supply line 210, the first pressure fluid supply line 210 sequentially passes through the radial passage 431, the central axial passage 421 and the line installation through hole in the upper portion of the inner rotary body 42, the outer diameter of the first pressure fluid supply line 210 is equal to the inner diameter of the line installation through hole, the inner diameters of the radial passage 431 and the central axial passage 421 are both larger than the outer diameter of the first pressure fluid supply line 210, the first pressure fluid supply line 210 is hermetically connected with the line installation through hole in the upper portion of the inner rotary body 42, and the first pressure fluid supply line 210 may be a high-strength metal pipe.

The upper end of the first pressure fluid supply line 210 is sealingly connected to an axial pressure chamber in the hydraulic chamber 222 of the first anchor mechanism 2, and the first pressure fluid can enter the axial pressure chamber in the hydraulic chamber 222 through the first pressure fluid supply line 210, thereby moving the piston 23 up and down. The side wall of the outer cylinder 64 is provided with a liquid supply channel 69, the axis of the liquid supply channel 69 is parallel to the axis of the outer cylinder 64, the upper end of the liquid supply channel 69 is correspondingly and hermetically connected with the inlet end of the radial channel 431, the first pressure liquid supply pipeline 210 is sleeved in the liquid supply channel 69, and the outer diameter of the first pressure liquid supply pipeline 210 is smaller than the inner diameter of the liquid supply channel 69. The second pressure fluid may sequentially enter the radial pressure cavity of the tool hydraulic cavity 44 through annular gaps between the first pressure fluid supply line 210 and the fluid supply passage 69, the inner diameter of the radial passage 431 and the central axial passage 421, thereby moving the cutting knife 45 in the radial direction of the outer housing 41.

In order to avoid the separation of the cutting mechanism 4 and the speed reducer 6, a connecting cylinder 47 is sleeved outside the joint of the cutting mechanism 4 and the speed reducer 6, the upper end of the connecting cylinder 47 is sleeved outside the lower end of the cutting mechanism 4, and the lower end of the connecting cylinder 47 is sleeved outside the upper end of the speed reducer 6. The connecting cylinder 47 includes left and right symmetrical cylinder bodies that connect the connecting cylinder 47 enclosing a completed cylinder. The upper end of the connecting cylinder 47 is fixedly connected with the lower end of the outer shell 41 through a screw, an inner ring groove is arranged in the lower end of the connecting cylinder 47, an outer convex ring is arranged outside the upper end of the outer cylinder 64, and the inner ring groove of the connecting cylinder 47 is in matched insertion connection with the outer convex ring of the outer cylinder 64.

In this embodiment, a protective cap 1 is arranged outside the first anchoring mechanism 2, the first anchoring mechanism 2 and the second anchoring mechanism 8 are identical in structure and mirror images of each other, and the second anchoring mechanism 8 is further sequentially connected with a first centralizer 9, a first connecting short section 10, a magnetic positioner 11, a second connecting short section 12 and a second centralizer 13. Namely, as shown in fig. 1, the mechanical electric cutting device for the single-cylinder double-well casing of the oil well comprises a protective cap 1, a first anchoring mechanism 2, a rotary joint 3, a cutting mechanism 4, a speed reducer 6, a driving motor 7, a second anchoring mechanism 8, a first centralizer 9, a first connecting short section 10, a magnetic positioner 11, a second connecting short section 12 and a second centralizer 13 which are sequentially connected from top to bottom.

The first anchoring mechanism 2 and the second anchoring mechanism 8 have the same structure and are mirror images of each other, in order to supply pressure liquid to the second anchoring mechanism 8, the second anchoring mechanism 8 is connected with a second pressure liquid supply pipeline 81, the upper end of the second pressure liquid supply pipeline 81 is hermetically connected with an axial pressure cavity in the hydraulic cavity 222 of the second anchoring mechanism 8, and third pressure liquid can enter the axial pressure cavity in the hydraulic cavity 222 of the second anchoring mechanism 8 through the second pressure liquid supply pipeline 81, so that the piston 23 of the second anchoring mechanism 8 moves up and down.

In addition, the side walls of the outer shells of the driving motor 7, the second anchoring mechanism 8, the first centralizer 9, the magnetic positioner 11 and the second centralizer 13 are all provided with liquid supply channels which are sequentially communicated, the structures of the liquid supply channels are the same as those of the liquid supply channel 69, the first pressure liquid supply pipeline 210 is sleeved in the liquid supply channels, and the second pressure liquid can flow through an annular gap between the first pressure liquid supply pipeline 210 and the liquid supply channels. Due to the relatively small outer diameters of the first and second connector sub 10, 12, the feed flow channel of the first centralizer 9 and the feed flow channel of the magnetic positioner 11 may be connected by a short pipe, the inner diameter of which is the same as the inner diameter of the feed flow channel. The liquid supply channel of the second centralizer 13 and the liquid supply channel of the magnetic positioner 11 may be connected by a short pipe having the same inner diameter as the liquid supply channel.

The lower end of the second centralizer 13 is provided with a pipe joint 131, as shown in fig. 6, the inner diameter of the pipe joint 131 is larger than that of the first pressure liquid supply pipeline 210, the upper end of the pipe joint 131 is correspondingly and hermetically connected with the lower end of the liquid supply channel of the second centralizer 13, the first pressure liquid supply pipeline 210 penetrates through the lower end of the pipe joint 131, the first pressure liquid supply pipeline 210 is hermetically connected with the pipe joint 131, the side wall of the pipe joint 131 is provided with a liquid injection port 132, and the second pressure liquid can enter an annular gap between the first pressure liquid supply pipeline 210 and the pipe joint 131 through the liquid injection port 132.

The side walls of the outer shells of the driving motor 7, the second anchoring mechanism 8, the first centralizer 9, the magnetic positioner 11 and the second centralizer 13 are respectively provided with a mounting hole which is communicated in sequence, and the inner diameter of each mounting hole can be slightly larger than the outer diameter of the second pressure liquid supply pipeline 81. A second pressure fluid supply line 81 passes through the mounting holes of the second centralizer 13, the magnetic positioner 11, the first centralizer 9, the second anchoring mechanism 8 and the drive motor 7 in this order, as shown in fig. 5.

The protective cap 1 is a cavity with certain thickness and wall thickness, and the top of the protective cap is of a conical structure. The outer surface of the anchoring housing 21 is provided with corresponding geometrical structures (grooves) suitable for the integral retraction of the tension claws 25, the surface of the tension claws 25 is provided with convex fine lines, and the structure body is provided with 6 lightening holes. The cutting mechanism 4 comprises two identical cutting knives 45, and the two identical cutting knives 45 are symmetrically distributed inside the inner rotating body 42.

The working process of the mechanical electric cutting device for the oil well single-cylinder double-well casing is described below.

Step 1: the mechanical electric cutting device for the oil well single-cylinder double-well casing is installed and connected according to the drawing shown in fig. 1 and fig. 2, and all components are debugged on the ground, at the moment, the tension claw 25 of the first anchoring mechanism 2, the cutting knife 45 of the cutting mechanism 4 and the tension claw 25 of the second anchoring mechanism 8 are all in a contraction state;

step 2: the mechanical electric cutting device for the single-cylinder double-well casing of the oil well is slowly lowered from the bottom of the well mouth, and the protective cap 1, the first anchoring mechanism 2, the rotary joint 3, the cutting mechanism 4, the speed reducer 6, the driving motor 7, the second anchoring mechanism 8, the first centralizer 9, the first connecting short section 10, the magnetic positioner 11, the second connecting short section 12 and the second centralizer 13 are sequentially lowered. After the cutting position is appointed, the first anchoring mechanism 2 and the second anchoring mechanism 8 are started through the control of ground equipment, so that the tension claw 25 of the first anchoring mechanism 2 and the tension claw 25 of the second anchoring mechanism 8 extend outwards in the radial direction, namely the tension claw 25 of the first anchoring mechanism 2 and the tension claw 25 of the second anchoring mechanism 8 are in an open state, and the mechanical electric cutting device for the oil well single-cylinder double-well casing is fastened on the inner wall of the casing;

and step 3: starting the cutting mechanism 4 to enable the cutting knife 45 of the cutting mechanism 4 to extend outwards in the radial direction, namely, the cutting knife 45 of the cutting mechanism 4 is in an open state; starting the driving motor 7 to drive the inner rotary body 42 and the cutting knife 45 to rotate in the forward direction, and extending the cutting knife to perform cutting operation;

and 4, step 4: after cutting, the tension claw 25 is released, the cutting knife 45 is retracted, the device is lifted upwards, and the sleeve cutting operation is completed.

For convenience of understanding and description, the absolute positional relationship is used in the present invention for expression, wherein the directional word "up" denotes an upper direction in fig. 2, "down" denotes a lower direction in fig. 2, "left" denotes a left direction in fig. 2, and "right" denotes a right direction in fig. 2. The present invention has been described in terms of the user's viewing angle, but the above terms of orientation should not be interpreted or interpreted as limiting the scope of the invention.

The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical schemes, and the technical schemes can be freely combined and used.

Claims (10)

1. The utility model provides an oil well single-cylinder double well casing pipe machinery electric cutting device, its characterized in that, oil well single-cylinder double well casing pipe machinery electric cutting device is including first anchoring mechanism (2), rotary joint (3), cutting mechanism (4), reduction gear (6), driving motor (7) and second anchoring mechanism (8) that set gradually, and cutting mechanism (4) contain cutting knife (45), and driving motor (7) can drive cutting knife (45) rotary cutting.

2. An oil well single-cylinder double-well casing mechanical electric cutting device according to claim 1, characterized in that the first anchoring mechanism (2) comprises an anchoring housing (21), a piston (23), a tension claw (25) and a support rod (27), the tension claw (25) is located outside the anchoring housing (21), the piston (23) is sleeved in the anchoring housing (21), and the tension claw (25) is connected with the piston (23) through the support rod (27).

3. Mechanical electrical cutting device for single-cylinder double-well casings of oil wells according to claim 2, characterized in that the piston (23) comprises a rod part and a head part, the head part of the piston (23) faces the rotary joint (3), a cylindrical hydraulic chamber (222) is sleeved between the head part of the piston (23) and the anchoring housing (21), an axial pressure chamber is arranged in the hydraulic chamber (222), and when pressure fluid is injected into the axial pressure chamber, the piston (23) can be away from the rotary joint (3) along the axial direction of the anchoring housing (21).

4. The mechanical electric cutting device for the oil well single-cylinder double-well casing pipe is characterized in that a cylindrical piston cavity (221) is sleeved between the rod portion of the piston (23) and the anchoring shell (21), a top spring (24) is arranged in the piston cavity (221), the top spring (24) can enable the piston (23) to be close to the rotary joint (3) along the axial direction of the anchoring shell (21), one end of the supporting rod (27) is connected with the tension claw (25) through a pin (26), the other end of the supporting rod (27) is abutted to a contact section of the rod portion of the piston (23), and when the piston (23) is close to the rotary joint (3) along the axial direction of the anchoring shell (21), the contact section of the rod portion of the piston (23) can push the supporting rod (27) and the tension claw (25) to be far away from the axis of the anchoring shell (21) along the radial direction of the anchoring shell (21.

5. Mechanical electrical cutting device for oil well single-barrel double-well casings according to claim 4, characterized in that the contact section of the stem of the piston (23) is of conical barrel shape with its tip facing the rotary joint (3), the first anchoring means (2) further comprising a positioning assembly capable of fixing the piston (23) relative to the anchoring housing (21) in the axial direction of the anchoring housing (21).

6. The mechanical electric cutting device for the single-cylinder double-well casing of the oil well as the double-cylinder double-well casing of the claim 5 is characterized in that the positioning assembly comprises a serrated plate (231), a plug pin (29) and a plug pin spring (28), the serrated plate (231) is fixed outside the rod part of the piston (23), the outer surface of the serrated plate (231) faces to the piston cavity (221), the outer surface of the serrated plate (231) is provided with a plurality of sawteeth, the sawteeth are arranged along the axial direction of the piston (23), one end of the plug pin (29) is positioned in the piston cavity (221), the other end of the plug pin (29) is in matched and inserted with the outer surface of the serrated plate (231), and the plug pin spring (28) can provide restoring force for the plug pin (29) to move along the radial direction of the anchoring shell (21.

7. The mechanical electric cutting device for the oil well single-cylinder double-well casing according to the claim 1, characterized in that the cutting mechanism (4) further comprises an inner rotating body (42) and an outer shell (41) which are sleeved inside and outside, the tail end of the cutting knife (45) is positioned in the inner rotating body (42), a cylindrical cutter hydraulic cavity (44) is sleeved between the tail end of the cutting knife (45) and the inner rotating body (42), a radial pressure cavity is arranged in the cutter hydraulic cavity (44), a central axial passage (421) is arranged in the inner rotating body (42), and the radial pressure cavity is communicated with the central axial passage (421).

8. The mechanical electric cutting device for single-cylinder double-well casing of oil well according to claim 7, characterized in that the cutting mechanism (4) further comprises an end cover (43), the end of the inner rotary body (42) and the end of the outer casing (41) are both connected with the end cover (43), the end of the inner rotary body (42) is sleeved with an external gear (46), the end cover (43) is internally provided with a radial channel (431), the outlet end of the radial channel (431) is positioned in the center of the end cover (43), the inlet end of the radial channel (431) is positioned at the edge of the end cover (43), the outlet end of the radial channel (431) is communicated with the inlet end of the central axial channel (421), the output shaft (61) of the reducer (6) passes through the end cover (43), the axis of the output shaft (61) of the reducer (6) is parallel to the axis of the inner rotary body (42), the outer end of the output shaft (61) of the reducer, the first gear (62) is meshed with the external gear (46), and both the inner rotor (42) and the outer housing (41) can rotate about the axis of the inner rotor (42).

9. Mechanical electrical cutting device for single-barrel double-well casings of oil wells according to claim 8, characterized in that the axis of the outer casing (41), the axis of the inner body (42) and the axis of the central axial channel (421) coincide, the first anchoring means (2) being connected with a first pressure fluid supply line (210), the first pressure fluid supply line (210) passing through the radial channel (431) and the central axial channel (421) in sequence, the radial channel (431) having an inner diameter and the central axial channel (421) having an inner diameter both greater than the outer diameter of the first pressure fluid supply line (210), the first pressure fluid supply line (210) being sealingly connected with the inner body (42).

10. The mechanical electric cutting device for the oil well single-cylinder double-well casing according to claim 1, characterized in that a protective cap (1) is arranged outside the first anchoring mechanism (2), the first anchoring mechanism (2) and the second anchoring mechanism (8) have the same structure and are mirror images of each other, and the second anchoring mechanism (8) is further sequentially connected with a first centralizer (9), a first connecting short section (10), a magnetic positioner (11), a second connecting short section (12) and a second centralizer (13).

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