Underground one-way pushing, sitting and hanging supporting tool

Abstract

The invention discloses an underground one-way pushing, sitting and hanging supporting tool which comprises an upper connector, a connector and an outer cylinder which are sequentially connected in a threaded mode. A piston is arranged in the connector; a locking ring is arranged between the piston and the outer cylinder; the piston is connected with the outer cylinder through a shear pin; one end of the outer cylinder away from the upper joint is provided with a blind plug; a slip opening is formed in the middle of the outer cylinder, and the slip is arranged in the slip opening. The expanding rate is larger, reliable anchoring force can be provided for open hole stratums and irregular well diameters, meanwhile, the whipstock can be tightly attached to one end of the well wall, and the sidetrack drilling failure risk is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of drilling, and particularly relates to a downhole one-way pushing, hanging and supporting tool. Background Art

[0002] In the middle and late production stages of offshore oil and gas fields, in order to increase the oil drainage area of oil reservoirs and improve the recovery rate of oil and gas fields, the multilateral well technology has become a key means for the petroleum industry to increase production and efficiency. This technology refers to drilling multiple branch wellbores in the main wellbore to achieve multi-target and three-dimensional exploitation in one well, thereby improving the recovery rate of oil reservoirs and economic benefits.

[0003] During the process of drilling multilateral wells, a milling cone, a whipstock and an anchor packer are required for pre-windowing operations. The traditional anchor is in the form of multiple slips, and the diameter expansion rate is limited. In the open-hole formation with a large well diameter expansion rate or an irregular wellbore, the anchoring force of the traditional anchor is limited, and there is a risk of dropping during the sidetracking of multilateral wells; secondly, after the drill string arrives at the position, the whipstock needs to set the tool face. Due to the multi-slip structure supporting the wellbore wall, the whipstock cannot be closely attached to one end of the wellbore wall, resulting in excessive wear of the inclined surface of the whipstock when the milling cone drills the side branch wellbore, and there is a risk of sidetracking failure. Summary of the Invention

[0004] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a downhole one-way pushing, hanging and supporting tool.

[0005] The present invention is achieved through the following technical solutions:

[0006] A downhole one-way pushing, hanging and supporting tool includes an upper sub, a connector and an outer barrel that are sequentially threadedly connected; a piston is arranged inside the connector; a locking ring is arranged between the piston and the outer barrel; the piston and the outer barrel are connected by shear pins; a blind plug is arranged at one end of the outer barrel away from the upper sub; a slip port is formed in the middle of the outer barrel, and slips are arranged in the slip port.

[0007] In the above technical solution, the upper sub is of a sleeve structure, and a first sealing ring is arranged between it and the connector.

[0008] In the above technical solution, the connector is of a stepped sleeve structure, and is composed of three parts: an upper section, an intermediate section and a lower section. The upper section is inserted into the upper sub, and the lower section is inserted into the outer barrel.

[0009] In the above technical solution, the piston is of a cylindrical structure with a blind hole formed in the middle, its bottom surface is an inclined bottom surface, and two splines adapted to the slips are arranged on the inclined bottom surface. A threaded hole for installing and fixing the slip bolt is formed between the two splines.

[0010] In the above technical solution, a second sealing ring is arranged between the piston and the connector.

[0011] In the above technical solution, an annular groove is formed on the outer wall of the middle part of the piston, and the locking ring is placed in the groove.

[0012] In the above technical solution, a plurality of shear pin grooves are evenly distributed along the circumference on the outer wall of the lower part of the piston, and the piston and the outer cylinder are fixedly connected through shear pins placed in the shear pin grooves.

[0013] In the above technical solution, the outer cylinder is of a sleeve structure, a slip pocket is formed on the lower middle part of the cylinder wall, threaded holes evenly distributed along the circumference are formed on the upper middle part of the cylinder wall, internal threads for connecting with a connector are formed on the inner wall of the upper part of the outer cylinder, an annular groove is formed on the inner wall of the lower part of the outer cylinder, and internal threads for connecting with a blind plug are formed in the annular groove.

[0014] In the above technical solution, a plurality of alloy teeth are evenly distributed on the outer circumferential wall where the slip pocket of the outer cylinder is located; saw teeth adapted to the locking ring are arranged in the upper middle part of the inner wall of the outer cylinder.

[0015] In the above technical solution, the slip is installed on the outer cylinder through the slip pocket, an inclined end face is formed on the piston-side end face of the slip, and splines adapted to the inclined bottom surface of the piston are arranged on the inclined end face. The piston-side inclined end face of the slip is parallel to the inclined bottom surface of the piston; the slip is fixed on the inclined bottom surface of the piston through bolts; a plurality of alloy teeth are welded on the outer side end face of the slip.

[0016] The beneficial effects of the present invention are as follows:

[0017] The present invention provides a downhole one-way push-to-set hanging support tool. Compared with the traditional multi-slip type anchor, the diameter expansion rate is larger. For open-hole formations, especially open-hole soft formations, and irregular wellbores such as oval wellbores or spiral wellbores, the present invention can provide reliable anchoring force; in the window sidetracking operation, it can make the whipstock closely adhere to one end of the wellbore, reduce the wear amount of the milling cone on the whipstock, and reduce the risk of sidetracking failure; the tool of the present invention has a small outer diameter and a short length, and its stiffness is relatively small, which is suitable for running in short-radius or ultra-short-radius main wellbores. Description of the Drawings

[0018] Figure 1 is the overall structural schematic diagram of the present invention;

[0019] Figure 2 is the layout schematic diagram of the alloy teeth welded on the outer cylinder of the present invention;

[0020] Figure 3 is the layout schematic diagram of the alloy teeth welded on the outer surface of the slip of the present invention;

[0021] Figure 4 is the structural schematic diagram of the one-way push-to-set hanging support tool after setting in the present invention;

[0022] Figure 5 is the structural schematic diagram of the present invention in the use state.

[0023] Wherein:

[0024] 1. Upper joint; 2. Connector; 3. Piston; 4. Lock ring; 5. Outer cylinder; 6. Slip; 7. Blind plug; 8. Shearing pin; 9. Bolt; 10. First sealing ring; 11. Second sealing ring; 12. Sidetracking milling cone; 13. Deflector.

[0025] For those of ordinary skill in the art, without creative efforts, other relevant drawings can be obtained based on the above drawings. Detailed implementation manners

[0026] To enable those skilled in the art of this technology to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below in conjunction with the drawings in the specification and through specific implementation manners.

[0027] Embodiment 1

[0028] As Figures 1 to 4 shown, a downhole one-way push-to-set and hang support tool includes an upper joint 1, a connector 2 and an outer cylinder 5 that are sequentially threadedly connected; a piston 3 is arranged inside the connector 2; a lock ring 4 is arranged between the piston 3 and the outer cylinder 5; the piston 3 and the outer cylinder 5 are connected by a shearing pin 8; a blind plug 7 is arranged at one end of the outer cylinder 5 away from the upper joint 1; a slip port is formed in the middle of the outer cylinder 5, and a slip 6 is arranged in the slip port.

[0029] The upper joint 1 is of a sleeve structure, and a first sealing ring 10 is arranged between it and the connector 2;

[0030] The connector 2 is of a stepped sleeve structure and consists of three parts: an upper section, a middle section and a lower section. The upper section is inserted into the upper joint 1, and the lower section is inserted into the outer cylinder 5; the outer diameter of the middle section is the same as that of the upper joint 1;

[0031] The piston 3 is of a cylindrical structure with a blind hole formed in the middle. Its bottom surface is an inclined bottom surface, and two splines adapted to the slip 6 are arranged on the inclined bottom surface to provide a track for the slip 6 to move along the inclined surface. A threaded hole for installing and fixing the slip bolt 9 is formed between the two splines; a second sealing ring 11 is arranged between the piston 3 and the connector 2; an annular groove is formed on the outer wall of the middle part of the piston 3, and the lock ring 4 is placed in the groove; a plurality of shearing pin grooves are evenly distributed along the circumference on the outer wall of the lower part of the piston 3, and the piston 3 and the outer cylinder 5 are fixedly connected by shearing pins 8 placed in the shearing pin grooves;

[0032] The outer cylinder 5 is of a sleeve structure. The lower part of its cylinder wall forms a slip mouth, and the upper part of its cylinder wall forms threaded holes evenly distributed along the circumference. The threaded holes are used to install the shear screws 8. The upper inner wall of the outer cylinder 5 forms an internal thread for connecting with the connector 2, and the lower inner wall forms an annular groove. An internal thread for connecting with the blind plug 7 is formed in the annular groove; alloy teeth are evenly distributed on the outer circumferential wall where the slip mouth of the outer cylinder 5 is located. The alloy teeth are used to provide a supporting biting force when the slips bite; saw teeth adapted to the locking ring 4 are arranged in the upper and middle parts of the inner wall of the outer cylinder 5;

[0033] The slips 6 are installed on the outer cylinder 5 through the slip mouth. The piston side end face of the slips 6 forms an inclined end face, and splines adapted to the inclined bottom face of the piston 3 are arranged on the inclined end face. The piston side inclined end face of the slips 6 is parallel to the inclined bottom face of the piston 3; the slips 6 are fixed to the inclined bottom face of the piston 3 by bolts 9; a plurality of alloy teeth are welded to the outer side end face of the slips 6 for biting the wellbore to improve the biting force of the slips 6 and achieve anchoring.

[0034] The usage method of the present invention:

[0035] As Figure 5 shown, the sidetracking mill 12, whipstock 13, and one-way push-to-hang and support tool are lowered into the predetermined position in the well in one trip. After being lowered in place, pressure is applied to the pipe string. The pressure is transmitted from the sidetracking mill 12 through the pressure transmission pipeline of the whipstock 13 into the inner cavity of the hang and support tool. Due to the pressure difference inside and outside the piston 3, the pressure pushes the piston 3. When the thrust is greater than the shearing force of the shear pin 8, the pin is sheared, and the piston 3 drives the locking ring 4 to move downward. The slips 6 move upward relative to the piston 3 along the inclined bottom face of the piston 3 and extend out of the slip mouth of the outer cylinder 5 to be anchored to the wellbore. At the same time, the alloy teeth on the outer circumference of the outer cylinder 5 are anchored to the wellbore to achieve setting. At this time, the locking ring 4 is adapted to the saw teeth on the inner circumference of the outer cylinder 5. After the tool is depressurized, the slips 6 cannot retract and still provide a reliable anchoring force. Then the sidetracking mill 12 disengages from the whipstock 13 and starts the window cutting and sidetracking operation.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0038] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the disclosure scope of the present invention.

Claims

1. An underground one-way push-up, sit-up and support tool, characterized in that: The invention comprises an upper joint (1), a connector (2) and an outer tube (5) which are threadedly connected in sequence; a piston (3) is arranged inside the connector (2); a locking ring (4) is arranged between the piston (3) and the outer tube (5); the piston (3) and the outer tube (5) are connected via a shear pin (8); a blind plug (7) is arranged at one end of the outer tube (5) away from the upper joint (1); a slip opening is formed in the middle of the outer tube (5), and a slip (6) is arranged in the slip opening.

2. The underground one-way push-pull, sit-hang support tool according to claim 1, characterized in that: The upper joint (1) is a sleeve structure, and a first sealing ring (10) is arranged between the upper joint and the connector (2).

3. The underground one-way push-pull, sit-hang support tool according to claim 1, characterized in that: The connector (2) is a stepped sleeve structure, consisting of an upper section, an interrupter and a lower section. The upper section is inserted into the upper joint (1), and the lower section is inserted into the outer tube (5).

4. The underground one-way push-pull, sit-hang support tool according to claim 1, characterized in that: The piston (3) is a cylindrical structure with a blind hole formed in the middle, and its bottom surface is an inclined bottom surface. Two splines matching the slips (6) are arranged on the inclined bottom surface, and a threaded hole for installing and fixing the slip bolts (9) is formed between the two splines.

5. The underground one-way push-pull, sit-hang support tool according to claim 1, characterized in that: A second sealing ring (11) is provided between the piston (3) and the connector (2).

6. The underground one-way push-pull, sit-hang support tool according to claim 1, characterized in that: An annular groove is formed on the outer wall of the middle part of the piston (3), and a locking ring (4) is placed in the groove.

7. The underground one-way push-pull, sit-hang support tool according to claim 1, characterized in that: The outer wall of the lower part of the piston (3) is evenly distributed with a plurality of shear pin grooves along the circumference, and the piston (3) and the outer cylinder (5) are fixedly connected via shear pins (8) placed in the shear pin grooves.

8. The underground one-way push-pull, sit-hang support tool according to claim 1, characterized in that: The outer cylinder (5) is a sleeve structure, wherein the lower cylinder wall forms a slip opening, wherein the upper cylinder wall forms threaded holes evenly distributed along the circumference, the upper inner wall of the outer cylinder (5) forms an internal thread connected to the connector (2), and the lower inner wall forms an annular groove, and the annular groove forms an internal thread connected to the blind plug (7).

9. The underground one-way push-pull, sit-hang support tool according to claim 1, characterized in that: The outer circumferential wall of the outer cylinder (5) where the slip opening is located is evenly distributed with a plurality of alloy teeth; and the middle and upper part of the inner wall of the outer cylinder (5) is provided with saw teeth that are compatible with the lock ring (4).

10. The underground one-way push-pull, sit-hang support tool according to claim 1, characterized in that: The slip (6) is installed on the outer cylinder (5) through the slip opening, the piston side end surface of the slip (6) forms an inclined end surface, and a spline matching the inclined bottom surface of the piston (3) is arranged on the inclined end surface, and the piston side inclined end surface of the slip (6) and the inclined bottom surface of the piston (3) are parallel to each other; the slip (6) is fixed to the inclined bottom surface of the piston (3) by bolts (9); and a plurality of alloy teeth are welded to the outer end surface of the slip (6).

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