Hydraulic adjustable joint

Abstract

The utility model discloses a hydraulic adjustable connector which comprises a body, an upper connector and a lower connector. Three pistons, namely a first piston, a second piston and a third piston, are coaxially arranged in the upper joint; when the upper shaft body pushes the lower shaft body to move outwards, the guide structure between the lower shaft body and the body drives the lower shaft body and the lower connector to deviate from the axis by a certain angle. According to the adjustable joint, through multiple times of ball throwing, under the action of different liquid flow pressures, liquid flow pushes different pistons in a tool to move so as to drive the lower joint to deviate at different angles, and the purpose of finding a'fish head 'in a stepped cross-range mode is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum well completion, in particular to a hydraulic adjustable joint. Background Art

[0002] During drilling operations, after drilling tool accidents or explosive loosening, the fish recovery process often struggles to locate the fish head due to irregular wellbore diameters, resulting in "candied haws" holes or "bulky wells." This necessitates the use of curved drill string assemblies to increase the range within which the fish head can be captured. However, since the degree and offset of the curved drill string cannot be precisely controlled, frequent trips and replacements are required to locate the fish head, increasing the time and difficulty of accident handling.

[0003] Therefore, based on the above technical problems, technicians in this field are in urgent need of developing a hydraulic adjustable joint. Utility Model Content

[0004] The purpose of the utility model is to provide a hydraulic adjustable joint. By throwing the ball multiple times, under the action of different liquid pressures, the liquid flow pushes different pistons in the tool to move, thereby driving the lower joint to produce different angles of deviation, thereby achieving the purpose of step-by-step cross-range searching for the "fish head".

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] The utility model provides a hydraulic adjustable joint, which comprises:

[0007] ontology;

[0008] an upper connector connected to the upper end of the body;

[0009] a lower joint located at the lower end of the body;

[0010] The main body has a shaft group, the shaft group is divided into an upper shaft and a lower shaft, and the upper shaft and the lower shaft are connected by a connecting shaft;

[0011] The lower end of the lower shaft is connected to the lower joint;

[0012] Three pistons are coaxially arranged in the upper joint, namely a first piston, a second piston and a third piston;

[0013] The outer diameter of the first piston is smaller than the inner diameter of the second piston and is located inside the second piston;

[0014] The outer diameter of the second piston is smaller than the inner diameter of the third piston and is located inside the third piston;

[0015] A first steel ball, a second steel ball, and a third steel ball are respectively engaged with the first piston, the second piston, and the third piston;

[0016] The first steel ball can block the end of the first piston and drive the first piston to move axially along the adjustable joint under the action of the liquid flow pressure to push the shaft body group to move;

[0017] The second steel ball can block the end of the second piston and drive the second piston to move axially along the adjustable joint under the action of the liquid flow pressure to push the shaft body group to move;

[0018] The third steel ball can block the end of the third piston and drive the third piston to move axially along the adjustable joint under the action of the liquid flow pressure to push the shaft body group to move;

[0019] When the upper shaft body pushes the lower shaft body to move outwards, the lower shaft body and the lower joint are driven to deviate from the axis by a certain angle through the guiding structure between the lower shaft body and the body.

[0020] Further, a limit pin is provided on one side of the upper joint;

[0021] The limit pin is engaged with the lower parts of the three pistons to limit the movement stroke of the three pistons through the limit pin.

[0022] Further, a stepped surface is formed on the side of the upper shaft body that cooperates with the body, and a stepped surface is correspondingly provided on the inner wall of the body. The two stepped surfaces form an accommodation space that can accommodate a spring;

[0023] When the upper shaft body drives the lower shaft body to move outwards along the adjustable joint, the upper shaft body compresses the spring.

[0024] Further, an anti-retreat pin assembly is provided at a position of the body close to the upper end of the upper shaft body;

[0025] The anti-retreat pin assembly includes:

[0026] A spring shaft;

[0027] A small spring sleeved outside the spring shaft; and

[0028] A spring cover buckled in the spring shaft groove of the body.

[0029] Further, the guiding structure includes:

[0030] A guiding inclined surface formed on the outer peripheral side of the lower shaft body; and

[0031] A positioning pin installed on the body, and the end of the positioning pin contacts the guiding inclined surface;

[0032] When the upper shaft body drives the lower shaft body to move, the positioning pin drives the lower shaft body to offset from the axis of the adjustable joint through the guiding inclined surface, so as to realize the offset of the lower joint.

[0033] Further, the angle by which the first piston pushes the shaft body group to move and drives the lower joint to offset from the axis is a;

[0034] The angle by which the second piston pushes the shaft body group to move and drives the lower joint to offset from the axis is b;

[0035] The angle by which the third piston pushes the shaft body group to move and drives the lower joint to offset from the axis is c;

[0036] Wherein, a < b < c.

[0037] In the above technical solution, a hydraulic adjustable joint provided by the present utility model has the following beneficial effects:

[0038] The adjustable joint of the present utility model realizes the purpose of step-by-step searching for the "fish head" in a wide range by throwing balls multiple times. Under the action of different liquid flow pressures, the liquid flow pushes different pistons in the tool to move, driving the lower joint to generate offsets at different angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0040] Figure 1 It is a schematic structural diagram of a hydraulic adjustable joint disclosed in an embodiment of the present application;

[0041] Figure 2 It is a schematic diagram of the first piston of the hydraulic adjustable joint disclosed in the embodiment of the present application pushing the shaft body group and the lower joint to move;

[0042] Figure 3 It is a schematic diagram of the second piston of the hydraulic adjustable joint disclosed in the embodiment of the present application pushing the shaft body group and the lower joint to move;

[0043] Figure 4 It is a schematic diagram of the third piston of the hydraulic adjustable joint disclosed in the embodiment of the present application pushing the shaft body group and the lower joint to move.

[0044] Description of the reference numerals:

[0045] 101, body; 102, upper joint; 103, lower joint;

[0046] 201. First piston; 202. Second piston; 203. Third piston;

[0047] 301. First steel ball; 302. Second steel ball; 303. Third steel ball;

[0048] 4. Limit pin;

[0049] 501. Upper shaft body; 502. Lower shaft body; 503. Spring; 504. Connecting shaft; 505. Guide inclined plane;

[0050] 6. Anti - withdrawal pin assembly. Detailed implementation mode

[0051] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the present utility model will be further introduced in detail below in conjunction with the accompanying drawings.

[0052] See Figures 1 to 4 as shown;

[0053] This embodiment discloses a hydraulic adjustable joint, and this adjustable joint includes:

[0054] Body 101;

[0055] Upper joint 102 connected to the upper end of the body 101;

[0056] Lower joint 103 located at the lower end of the body 101;

[0057] The body 101 is internally provided with a shaft body group, the shaft body group is divided into an upper shaft body 501 and a lower shaft body 502, and the upper shaft body 501 and the lower shaft body 502 are connected by a connecting shaft 504;

[0058] The lower end of the lower shaft body 502 is connected to the lower joint 103;

[0059] Three pistons are coaxially arranged in the upper joint 102, namely the first piston 201, the second piston 202 and the third piston 203;

[0060] The outer diameter of the first piston 201 is smaller than the inner diameter of the second piston 202 and is located inside the second piston 202;

[0061] The outer diameter of the second piston 202 is smaller than the inner diameter of the third piston 203 and is located inside the third piston 203;

[0062] The first steel ball 301, the second steel ball 302 and the third steel ball 303 are respectively matched with the first piston 201, the second piston 202 and the third piston 203;

[0063] The first steel ball 301 can block the end of the first piston 201 and drive the first piston 201 to move axially along the adjustable joint under the action of the liquid flow pressure to push the shaft body group to move;

[0064] The second steel ball 302 can block the end of the second piston 202 and drive the second piston 202 to move axially along the adjustable joint under the action of the liquid flow pressure to push the shaft body group to move;

[0065] The third steel ball 303 can block the end of the third piston 203 and drive the third piston 203 to move axially along the adjustable joint under the action of the liquid flow pressure to push the shaft body group to move;

[0066] When the upper shaft body 501 pushes the lower shaft body 502 to move outwards, the lower shaft body 502 and the lower joint 103 are driven to deviate from the axis by a certain angle through the guiding structure between the lower shaft body 502 and the body 101.

[0067] Specifically, this embodiment discloses a hydraulic adjustable joint, whose main body is a body 101, an upper joint 102 and a lower joint 103; wherein, a shaft body group is arranged inside the body 101, and three stepped pistons are arranged inside the upper joint 102, namely the above-mentioned first piston 201, second piston 202 and third piston 203; the piston group of this embodiment is used to drive the shaft body group to move under the action of the liquid flow pressure, so as to drive the lower joint 103 to move. The first piston 201 of this embodiment is matched with a first steel ball 301, the second piston 202 is matched with a second steel ball 302, and the third piston 203 is matched with a third steel ball 303. When the first steel ball 301 is put in, the first piston 201 can be blocked, and then the first piston 201 is driven to move axially under the action of the liquid flow pressure and push the upper shaft body 501, and the upper shaft body 501 is used to push the lower shaft body 502, so as to drive the lower joint 103 to move. And so on, no more details will be described. The upper shaft body 501 and the lower shaft body 502 of this embodiment are connected by a connecting shaft 504, and a guiding structure is arranged between the lower shaft body 502 and the body 101, and the guiding structure is used to drive the lower shaft body 502 to deviate when it moves, and finally realize the movement deviation of the lower joint 103.

[0068] Preferably, a limit pin 4 is arranged on one side of the upper joint 102 of this embodiment;

[0069] The limit pin 4 is matched with the lower parts of the three pistons to limit the movement stroke of the three pistons through the limit pin 4.

[0070] Preferably, a step surface is formed on the side of the upper shaft body 501 that is matched with the body 101, and a corresponding step surface is arranged on the inner wall of the body 101, and the two step surfaces form an accommodation space that can accommodate a spring;

[0071] When the upper shaft body 501 drives the lower shaft body 502 to move outward along the adjustable joint, the upper shaft body 501 compresses the spring 503.

[0072] Preferably, an anti-retreat pin assembly 6 is provided at a position of the main body 101 of this embodiment near the upper end of the upper shaft body 501;

[0073] Among them, the anti-retreat pin assembly 6 of this embodiment includes a spring shaft, a small spring sleeved outside the spring shaft, and a spring cover buckled in the spring shaft groove of the main body 101.

[0074] Preferably, the guiding structure of this embodiment includes:

[0075] A guiding inclined surface 505 formed on the outer peripheral side of the lower shaft body 502; and

[0076] A positioning pin 506 installed on the main body 101, and the end of the positioning pin 506 contacts the guiding inclined surface 505;

[0077] When the upper shaft body 501 drives the lower shaft body 502 to move, the positioning pin 506 drives the lower shaft body 502 to deviate from the axis of the adjustable joint through the guiding inclined surface 505 to realize the deviation of the lower joint 103.

[0078] The angle at which the first piston 201 of this embodiment pushes the shaft body group to move and drives the lower joint 103 to deviate from the axis is a;

[0079] The angle at which the second piston 202 pushes the shaft body group to move and drives the lower joint 103 to deviate from the axis is b;

[0080] The angle at which the third piston 203 pushes the shaft body group to move and drives the lower joint 103 to deviate from the axis is c;

[0081] Among them, a < b < c.

[0082] During specific use: When the tool is lowered to the position of the channel to be explored, if the channel cannot be found under normal circumstances, at this time, the first steel ball 301 should be put in, and the pump pressure is increased to 4 MPa. At this time, the first piston 201 moves downward along the axis under the action of the liquid flow, shearing the corresponding pin shaft. The first piston 201 moves downward to push the upper shaft body 501 to compress the spring 503, and drives the lower shaft body 502 through the connecting shaft 504 to push the lower joint 103. At this time, the positioning pin 506 acts on the guiding inclined surface 505 to drive the lower joint 103 to generate deviation during the downward movement. When the first piston 201 moves downward by 70 mm, the deviation angle of the lower joint 103 is a = 1°. At this time, the anti-retreat pin extends to prevent the upper shaft body 501 from resetting under the action of the spring 503 due to the cancellation of the liquid flow pressure. At this time, the lower joint 103 drives the pen tip connected below to continue to explore the channel;

[0083] If a channel is found, the repair of the channel will start. If no channel is found yet, the second steel ball 302 will be put in continuously. The second steel ball 302 falls to the entrance of the second piston 202. At this time, under the action of the liquid flow pressure of 7 MPa, the second piston 202 moves downward along the axis, shearing the corresponding pin shaft. The downward movement of the second piston 202 pushes the upper shaft body 501 to continue compressing the spring 503, driving the lower shaft body 502 through the connecting shaft 504 to push the lower joint 103 to move downward along the positioning pin 506. Through the positioning pin 506 and the guiding inclined plane 505, the lower joint is forced to generate an offset in the next process. When the second piston 202 moves downward by 89 mm, the offset angle b of the lower joint 103 is 1.5°.

[0084] Similarly, the third steel ball 303 is put in. The third piston 203 moves downward along the axis under the action of the liquid flow pressure of 11 MPa. When the third piston 203 moves downward by 105 mm, at this time, the offset angle c of the lower joint 103 is 2°.

[0085] Operate like this. After finally finding the channel, repair the channel.

[0086] Note that it is strictly prohibited to start the pump during the lowering process to prevent the liquid flow shear pin generated by starting the pump from forcing the lower joint to generate an offset in advance.

[0087] In the above technical solution, a hydraulic adjustable joint provided by the present utility model has the following beneficial effects:

[0088] The adjustable joint of the present utility model realizes the purpose of finding the "fish head" in a stepped and wide range by putting balls multiple times. Under the action of different liquid flow pressures, the liquid flow pushes different pistons in the tool to move, driving the lower joint to generate offsets at different angles.

[0089] Only some exemplary embodiments of the present utility model are described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present utility model, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present utility model.

Claims

1. Hydraulic adjustable joint, characterized in that, The adjustable joint includes: a body (101); an upper joint (102) connected to the upper end of the body (101); a lower joint (103) located at the lower end of the body (101); a shaft body group is provided inside the body (101), the shaft body group is divided into an upper shaft body (501) and a lower shaft body (502), and the upper shaft body (501) and the lower shaft body (502) are connected by a connecting shaft (504); the lower end of the lower shaft body (502) is connected to the lower joint (103); three pistons are coaxially arranged inside the upper joint (102), namely a first piston (201), a second piston (202) and a third piston (203); the outer diameter of the first piston (201) is smaller than the inner diameter of the second piston (202) and is located inside the second piston (202); the outer diameter of the second piston (202) is smaller than the inner diameter of the third piston (203) and is located inside the third piston (203); a first steel ball (301), a second steel ball (302) and a third steel ball (303) are respectively matched with the first piston (201), the second piston (202) and the third piston (203); the first steel ball (301) can block the end of the first piston (201) and drive the first piston (201) to move axially along the adjustable joint under the action of the liquid flow pressure to push the shaft body group to move; the second steel ball (302) can block the end of the second piston (202) and drive the second piston (202) to move axially along the adjustable joint under the action of the liquid flow pressure to push the shaft body group to move; the third steel ball (303) can block the end of the third piston (203) and drive the third piston (203) to move axially along the adjustable joint under the action of the liquid flow pressure to push the shaft body group to move; 2. The hydraulic adjustable joint according to claim 1, characterized in that, when the upper shaft body (501) pushes the lower shaft body (502) to move outwards, the lower shaft body (502) and the lower joint (103) are driven to deviate from the axis by a certain angle through the guiding structure between the lower shaft body (502) and the body (101). a limit pin (4) is arranged on one side of the upper joint (102); 3. The hydraulic adjustable joint according to claim 1, characterized in that, the limit pin (4) is matched with the lower parts of the three pistons to limit the movement stroke of the three pistons through the limit pin (4); a step surface is formed on the side of the upper shaft body (501) that is matched with the body (101), and a corresponding step surface is arranged on the inner wall of the body (101), and the two step surfaces form a receiving space that can accommodate a spring (503); 4. The hydraulic adjustable joint according to claim 1, characterized in that, when the upper shaft body (501) drives the lower shaft body (502) to move outwards along the adjustable joint, the upper shaft body (501) compresses the spring (503); an anti-retreat pin assembly (6) is arranged at a position of the body (101) close to the upper end of the upper shaft body (501); the anti-retreat pin assembly (6) includes: a spring shaft; a small spring sleeved outside the spring shaft; and 5. The hydraulic adjustable joint according to claim 3, wherein, a spring cover buckled in the spring shaft groove of the body (101). The guiding structure includes: A guiding inclined surface (505) formed on the outer peripheral side of the lower shaft body (502); and A positioning pin (506) installed on the body (101), the end of the positioning pin (506) being in contact with the guiding inclined surface (505); When the upper shaft body (501) drives the lower shaft body (502) to move, the positioning pin (506) drives the lower shaft body (502) to offset from the axis of the adjustable joint through the guiding inclined surface (505) so as to realize the offset of the lower joint.

6. The hydraulic adjustable joint according to claim 5, characterized in that, The angle by which the first piston (201) pushes the shaft body group to move and drives the lower joint (103) to offset from the axis is a; The angle by which the second piston (202) pushes the shaft body group to move and drives the lower joint (103) to offset from the axis is b; The angle by which the third piston (203) pushes the shaft body group to move and drives the lower joint (103) to offset from the axis is c; Wherein, a < b < c.

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