A hydraulic release safety joint

Abstract

The utility model relates to a hydraulic release safety joint, including an upper joint, a lower joint, and a sleeve; the top side of the sleeve is inserted into the bottom end of the upper joint, and the top side of the lower joint is inserted into the bottom side of the sleeve and connected; a release joint is also connected to the upper joint, and a claw portion is provided on the bottom side of the release joint, and a piston is also provided in the sleeve, and an inner support portion is provided on the top side of the piston; the claw portion of the release joint is sleeved on the inner support portion, and the outer side of the claw portion is clamped with the inner wall of the sleeve; the hydraulic release safety joint also includes an inner protective sleeve, which is provided between the upper joint and the lower joint, and penetrates the release joint and the piston; the piston and the inner protective sleeve are connected by shear nails. The hydraulic release safety joint of the utility model pushes the piston by hydraulic pressure to cut the shear nails, and uses the claw of the release joint to retract and disengage from the sleeve to achieve release; during the release process, there is no need to put in a steel ball, and the structure is simple and practical, and the construction is convenient.

Description

Technical Field

[0001] The utility model relates to the field of petroleum equipment, in particular to a hydraulic release safety joint. Background Art

[0002] Hydraulic release safety joints are suitable for use in layered fracturing, layered acidizing, testing pipe strings and other construction. Most hydraulic release safety joints on the market are used for fracturing pipe string construction. When the pipe string is stuck or the process design requires the pipe string above the hydraulic release safety joint to be poured out, a steel ball needs to be put into the wellhead to cut off the shear nails of the hydraulic safety joint to separate the upper and lower parts of the pipe string, thereby realizing the release operation. This release method is cumbersome to construct. There is an urgent need for a release joint that can achieve release without the need for a steel ball. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a hydraulic release safety joint, which pushes the piston by hydraulic pressure to cut the shear nails, and utilizes the claws of the release joint to retract and disengage from the sleeve to achieve release; during the release process, there is no need to throw in a steel ball, the structure is simple and practical, and the construction is convenient.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a hydraulic release safety joint, comprising an upper joint, a lower joint and a sleeve; the top side of the sleeve is inserted into the bottom end of the upper joint, and the top side of the lower joint is inserted into the bottom side of the sleeve and connected; a release joint is also connected in the upper joint, a flap claw portion is provided on the bottom side of the release joint, a piston is also provided in the sleeve, and an inner support portion is provided on the top side of the piston; the flap claw portion of the release joint is sleeved on the inner support portion, and the outer side of the flap claw portion is clamped with the inner wall of the sleeve; the hydraulic release safety joint also includes an inner protective sleeve, which is provided between the upper joint and the lower joint, and is passed through the release joint and the piston; the piston and the inner protective sleeve are connected by shear nails.

[0005] Furthermore, the piston is used to shear the shear nails when it moves under pressure; the release joint is used to retract the claw part and disengage from the sleeve after the piston moves downward to disengage from the release joint, thereby disengaging the sleeve, the lower joint, the piston and the upper joint, the release joint, and the inner protective sleeve to achieve release.

[0006] Furthermore, a first hole is provided on the side wall of the piston; a first groove is provided on the inner protective sleeve at a position corresponding to the first hole; and the shear nail connects the piston and the inner protective sleeve through the first hole and the first groove.

[0007] Furthermore, a protrusion is provided on the bottom side of the outer periphery of the flap claw portion of the release connector; a step with a smaller inner diameter at the top and a larger inner diameter at the bottom is provided on the inner wall of the sleeve at a position corresponding to the protrusion; the protrusion is located on the large inner diameter side of the step of the sleeve to achieve the clamping connection between the flap claw portion and the sleeve.

[0008] Furthermore, the top side of the protrusion has a first transition slope; and the step has a second transition slope matching the first transition slope.

[0009] Furthermore, an internal thread of the upper joint is arranged on the inner wall of the upper joint near the bottom end; an external thread of the upper joint is arranged on the outer wall of the release joint near the top end; and the release joint is threadedly connected by cooperating the external thread of the release joint with the internal thread of the upper joint of the upper joint.

[0010] Furthermore, a second hole is provided on the side wall of the upper joint; a second groove is provided on the drop joint at a position corresponding to the second hole; and a first fixing screw is provided in the second hole and the second groove.

[0011] Furthermore, the outer wall of the lower joint is provided with a lower joint external thread near the top; the bottom area of ​​the inner wall of the sleeve is provided with a sleeve internal thread; the lower joint is threadedly connected by the cooperation of the lower joint external thread and the sleeve internal thread of the sleeve.

[0012] Furthermore, the side wall of the sleeve is also provided with a third hole; the lower joint is provided with a third groove at a position corresponding to the third hole; and a second set screw is provided in the third hole and the third groove.

[0013] Furthermore, a locking block is provided between the release joint and the sleeve.

[0014] Beneficial effects of the utility model: the hydraulic release safety joint of the utility model pushes the piston through the hydraulic pressure to cut the shear nails, and utilizes the claws of the release joint to retract and disengage from the sleeve to achieve release; during the release process, there is no need to throw in a steel ball, the structure is simple and practical, and the construction is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a hydraulic release safety joint of an embodiment;

[0016] Figure 2 A schematic diagram of an upper joint of a hydraulic release safety joint according to an embodiment;

[0017] Figure 3 A schematic diagram of a lower joint of a hydraulic release safety joint according to an embodiment;

[0018] Figure 4 A schematic diagram of a sleeve of a hydraulic release safety joint in an embodiment;

[0019] Figure 5 A schematic diagram of a release joint of a hydraulic release safety joint according to an embodiment;

[0020] Figure 6 for Figure 5A schematic cross-sectional view of AA;

[0021] Figure 7 A schematic diagram of a piston of a hydraulic release safety joint in an embodiment;

[0022] Among them, 1-upper joint, 2-lower joint, 3-sleeve, 4-release joint, 5-piston, 6-inner protective sleeve, 7-first fastening screw, 8-second fastening screw, 9-shear nail, 10-locking block, 101-upper joint internal thread, 102-second hole, 201-lower joint external thread, 202-third groove, 301-sleeve internal thread, 302-step, 303-third hole, 401-valve claw part, 402-upper joint external thread, 403-protrusion, 404-first transition slope, 405-second groove, 501-inner support part, 502-first hole. DETAILED DESCRIPTION

[0023] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0024] Example

[0025] Please refer to Figures 1 to 7 As shown, this embodiment provides a hydraulic release safety joint, including an upper joint 1, a lower joint 2, and a sleeve 3; the top side of the sleeve 3 is inserted into the bottom end of the upper joint 1, and the top side of the lower joint 2 is inserted into the bottom side of the sleeve 3 and connected; the upper joint 1 is also connected to a release joint 4, the bottom side of the release joint 4 is provided with a flap claw portion 401, the sleeve 3 is also provided with a piston 5, and the top side of the piston 5 is provided with an inner support portion 501; the flap claw portion 401 of the release joint 4 is sleeved on the inner support portion 501, and the outer side of the flap claw portion 401 is clamped with the inner wall of the sleeve 3; the hydraulic release safety joint also includes an inner protective sleeve 6, which is arranged between the upper joint 1 and the lower joint 2, and is penetrated through the release joint 4 and the piston 5; the piston 5 and the inner protective sleeve 6 are connected by shear nails 9. In this embodiment, the piston 5 is used to shear the shear nails when it moves under pressure; the release joint 4 is used to retract the claw part 401 and disengage from the sleeve 3 after the piston moves downward to disengage from the release joint 4, thereby disengaging the sleeve 3, the lower joint 2, the piston 5 from the upper joint 1, the release joint 4, and the inner protective sleeve 6 to achieve release.

[0026] Refer to Figure 1 and Figure 7 As shown, the side wall of the piston 5 is provided with a first hole 502; the inner protective sleeve 6 is provided with a first groove at a position corresponding to the first hole 502; the shear nail connects the piston 5 and the inner protective sleeve 6 through the first hole 502 and the first groove.

[0027] Refer to Figure 1 , Figure 4 and Figure 5 As shown, a protrusion 403 is provided on the bottom side of the outer periphery of the flap claw portion 401 of the release joint 4; a step 302 with a smaller inner diameter at the top and a larger inner diameter at the bottom is provided on the inner wall of the sleeve 3 at a position corresponding to the protrusion 403; the protrusion 403 is located on the large inner diameter side of the step 302 of the sleeve 3 to achieve the clamping connection between the flap claw portion 401 and the sleeve 3. The top side of the protrusion 403 has a first transition slope 404; the step 302 has a second transition slope 302 that cooperates with the first transition slope 404. In this embodiment, after the piston 5 is disengaged, the flap claw portion is forced to retract inward by gravity and through the cooperation of the slope, thereby causing the release joint 4 to be out of the clamping state with the sleeve 3.

[0028] Refer to Figure 1 , Figure 2 and Figure 5 As shown, the inner wall of the upper joint 1 is provided with an upper joint internal thread 101 near the bottom; the outer wall of the release joint 4 is provided with an upper joint external thread 402 near the top; the release joint 4 is threadedly connected with the upper joint internal thread 101 of the upper joint 1 through the release joint external thread 402. The side wall of the upper joint 1 is also provided with a second hole 102; the release joint 4 is provided with a second groove 404 at a position corresponding to the second hole 102; the second hole 102 and the second groove 404 are provided with a first set screw 7. In this embodiment, after the upper joint 1 and the release joint 4 are threadedly connected in place, the first set screw 7 is used to prevent the upper joint 1 and the release joint 4 from rotating relative to each other.

[0029] Refer to Figure 1 , Figure 3 and Figure 4 As shown, the outer wall of the lower joint 2 is provided with a lower joint external thread 201 near the top; the inner wall of the sleeve 3 is provided with a sleeve internal thread 301 in the bottom area; the lower joint 2 is threadedly connected with the sleeve internal thread 301 of the sleeve 3 through the lower joint external thread 201. The side wall of the sleeve 3 is also provided with a third hole 303; the lower joint 2 is provided with a third groove 202 at a position corresponding to the third hole 303; the third hole 303 and the third groove 202 are provided with a second set screw 8. In this embodiment, after the lower joint 2 and the sleeve 3 are threadedly connected in place, the second set screw 8 is used to prevent the lower joint 2 and the sleeve 3 from rotating relative to each other.

[0030] Refer to Figure 1 As shown, a locking block 10 is further provided between the release joint 4 and the sleeve 3. In this embodiment, the locking block 10 is used to realize the transmission of torque.

[0031] A hydraulic release safety joint of this embodiment continues to be pressurized after the packer is set, and the hydraulic pressure pushes the piston to move, shearing the shear pins, and the claws of the release joint retract and disengage from the sleeve; the sleeve, piston, lower joint and packer remain in the well to achieve release.

[0032] The above embodiments should not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent conversion shall fall within the protection scope of the present invention.

Claims

1. A hydraulic release safety joint, characterized in that: It comprises an upper joint, a lower joint and a sleeve; the top side of the sleeve is inserted into the bottom end of the upper joint, and the top side of the lower joint is inserted into and connected with the bottom side of the sleeve; a release joint is also connected inside the upper joint, a flap claw portion is provided on the bottom side of the release joint, a piston is also provided inside the sleeve, and an inner support portion is provided on the top side of the piston; the flap claw portion of the release joint is sleeved on the inner support portion, and the outer side of the flap claw portion is clamped with the inner wall of the sleeve; the hydraulic release safety joint also comprises an inner protective sleeve, which is provided between the upper joint and the lower joint, and is passed through the release joint and the piston; the piston and the inner protective sleeve are connected by shear nails.

2. A hydraulic release safety joint according to claim 1, characterized in that: The piston is used to shear the shear nail when it moves under pressure; the release joint is used to retract the claw part and disengage from the sleeve after the piston moves downward to disengage from the release joint, thereby disengaging the sleeve, the lower joint, the piston and the upper joint, the release joint, and the inner protective sleeve to achieve release.

3. A hydraulic release safety joint according to claim 1, characterized in that: The side wall of the piston is provided with a first hole; the inner protective sleeve is provided with a first groove at a position corresponding to the first hole; the shear nail connects the piston and the inner protective sleeve through the first hole and the first groove.

4. A hydraulic release safety joint according to claim 1, characterized in that: A protrusion is provided on the bottom side of the outer periphery of the claw portion of the drop joint; a step with a smaller inner diameter at the top and a larger inner diameter at the bottom is provided on the inner wall of the sleeve at a position corresponding to the protrusion; the protrusion is located on the large inner diameter side of the step of the sleeve to achieve the clamping connection between the claw portion and the sleeve.

5. A hydraulic release safety joint according to claim 4, characterized in that: The top side of the protrusion has a first transition slope; the step has a second transition slope matched with the first transition slope.

6. A hydraulic release safety joint according to claim 1, characterized in that: The inner wall of the upper joint is provided with an upper joint internal thread near the bottom end; the outer wall of the release joint is provided with an upper joint external thread near the top end; the release joint is threadedly connected by the release joint external thread cooperating with the upper joint internal thread of the upper joint.

7. A hydraulic release safety joint according to claim 6, characterized in that: The side wall of the upper joint is also provided with a second hole; the drop-out joint is provided with a second groove at a position corresponding to the second hole; and a first set screw is provided in the second hole and the second groove.

8. The hydraulic release safety joint according to claim 1, characterized in that: The outer wall of the lower joint is provided with a lower joint external thread near the top; the inner wall of the sleeve is provided with a sleeve internal thread in the bottom area; the lower joint is threadedly connected by the cooperation of the lower joint external thread and the sleeve internal thread of the sleeve.

9. A hydraulic release safety joint according to claim 8, characterized in that: The side wall of the sleeve is also provided with a third hole; the lower joint is provided with a third groove at a position corresponding to the third hole; and a second set screw is provided in the third hole and the third groove.

10. A hydraulic release safety joint according to claim 1, characterized in that: A locking block is also provided between the release joint and the sleeve.

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