Controllable hydraulic fishing spear for horizontal well

Abstract

The utility model relates to the field of horizontal well salvage operation, and provides a controllable hydraulic salvage spear for a horizontal well, which comprises an upper joint, a centralizing and centering component, a salvage component and a milling head, one end of the centralizing and centering part is in internal thread connection with the upper joint, and the other end is in internal thread connection with the end part of the fishing part; a milling head is arranged at the other end part of the fishing part; and grinding and milling grooves in an annular array are formed in the surface of the grinding and milling head. The ball in the supporting component is tightly attached to the inner wall of the tubular column, so that the fishing component is aligned to the center of a fracture; meanwhile, the external tangent circle formed on the ball surface of the ball enables the ball to bypass small hindering substances in the pipe in the rotating advancing process until the ball reaches a preset position; the device has the advantages of being simple in structure and good in centering effect, and the fishing efficiency can be greatly improved.

Description

Technical Field

[0001] The utility model relates to a controllable hydraulic fishing spear for a horizontal well, belonging to the field of horizontal well fishing operations. Background Art

[0002] In oil well repair operations, after a long period of production, when sand is produced in the well, the oil, water and gas wells will be shut down and overhauled. During the overhaul and repair operations, the pipes and rods in the well are often buried in sand, such as the pump barrel and the filter tube. Therefore, according to the needs of the operation, these pipes and rods in the well must be processed by milling and salvaging to remove the sand. The Chinese utility model patent with patent application number CN201921917489.3 discloses a composite local reverse circulation milling barrel, which is mainly used for collecting debris and efficient milling during milling in oil, gas (water) well repair operations.

[0003] However, the inventor of the utility model patent found that the prior art has the following problems: Since the currently used sleeve milling fishing tools do not have the function of straightening, especially in the process of fishing oil pipes in horizontal wells, for fishing oil pipes with irregular fractures in horizontal wells, in the prior art, grinding shoes are usually used first, and then fishing spears are used for fishing. When using the fishing spear fishing operation, it is difficult to align the fishing spear with the center of the oil pipe in the horizontal well under the action of gravity. The fishing spear in the prior art is controlled by a slider, which is difficult to control in a horizontal well, and the fishing efficiency is extremely low. Therefore, improvements are needed to address this situation. Summary of the invention

[0004] In order to solve the above technical problems, the utility model provides a controllable hydraulic spear for a horizontal well. The controllable hydraulic spear for a horizontal well has a straightening and centering function and can be concentric with the casing in the horizontal well.

[0005] The utility model is realized through the following technical solutions.

[0006] The utility model provides a controllable hydraulic spear for a horizontal well, comprising an upper joint, a centering component, a fishing component and a milling head; one end of the centering component is connected with an internal thread of the upper joint, and the other end is connected with an internal thread of an end portion of the fishing component; a milling head is arranged at the other end portion of the fishing component; and a milling groove in an annular array is arranged on the surface of the milling head.

[0007] The centering and centering component comprises a centering body, a ball bearing, a pressure cover and a first O-ring; the surface of the centering body is rollingly connected with the ball bearing through a positioning hole; and the pressure cover is threadedly connected with the centering body through screws after being sleeved on the surface of the ball bearing.

[0008] The first O-type sealing ring is nested in the annular hole on the inner cavity surface of the gland and contacts the surface of the ball.

[0009] The diameter of the circumscribed circle formed by the surfaces of the balls arranged in the annular array is larger than the outer diameter of the straightening body.

[0010] The fishing component comprises a spear rod, a limiting block, a spear block and a spear shaft; the limiting block is welded to the inner surface of the rectangular groove of the annular array on the spear rod; the spear block is slidably connected with the surface of the limiting block through the spear shaft.

[0011] One end of the lance scoop shaft is provided with a blocking screw fixed on the surface of the lance scoop rod.

[0012] The salvaging component also includes a piston rod, a spring, a bluff body, a second O-ring and a third O-ring; the piston rod surface is covered with a spring, and the outer surface of the piston rod end is slidably connected to the inner surface of the straightening body; the outer surface of the piston rod end is sequentially covered with a second O-ring and a third O-ring; the piston rod end is threadedly connected with the bluff body.

[0013] The beneficial effects of the utility model are as follows: by placing the ball in the supporting component close to the inner wall of the pipe column, the salvage component is aligned with the center of the fracture; at the same time, the circumscribed circle formed on the surface of the ball enables the ball to bypass the small obstructing materials in the pipe during the rotation process until it reaches the predetermined position; it has the advantages of simple structure and good centering effect, and can greatly improve the salvage efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the overall structure diagram of the utility model;

[0015] Figure 2 yes Figure 1 Section view at AA in the figure;

[0016] Figure 3 yes Figure 1 Section view at BB in;

[0017] Figure 4 yes Figure 1 Left view of the milling slot.

[0018] In the figure: 1-upper joint, 2-centering component, 21-centering body, 22-ball, 23-pressure cover, 24-first O-ring, 3-fishing component, 31-spear rod, 32-limiting block, 33-spear block, 34-spear shaft, 35-blocking screw, 36-piston rod, 37-spring, 38-baffle body, 39-second O-ring, 40-third O-ring, 4-milling head, 41-milling groove. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0020] The first embodiment of the utility model relates to Figure 1-4 A controllable hydraulic spear for a horizontal well shown in the figure comprises an upper joint 1, a centering and straightening component 2, a salvaging component 3 and a milling head 4; one end of the centering and straightening component 2 is connected with the internal thread of the upper joint 1, and the other end is connected with the internal thread of the end of the salvaging component 3; a milling head 4 is provided at the other end of the salvaging component 3; a milling head 4 is provided on the surface of the milling head 4 with a ring array of milling grooves 41; the inner hole of the upper joint 1 is processed into a thread of an oil drill pipe joint and can be connected with the drill pipe; the centering and straightening component 2 mainly functions to realize centering of the hydraulic spear; the salvaging component 3 is mainly used to salvage the oil pipe at a predetermined position; the milling head 4 is mainly used to quickly mill the fracture; the milling groove 41 is used to discharge milling debris.

[0021] The second embodiment of the utility model is basically the same as the first embodiment, mainly in that the solution of the centering component is optimized. The centering component 2 includes a centering body 21, a ball bearing 22, a pressure cover 23 and a first O-ring 24; the surface of the centering body 21 is rollingly connected with the ball bearing 22 through a positioning hole; the pressure cover 23 is threadedly connected with the centering body 21 through screws after being sleeved on the surface of the ball bearing 22; the centering body 21 is the main structure of the centering component 2, and mainly plays a force-bearing supporting role; the ball bearing 22 is tightly attached to the inner wall of the casing to rotate itself, ensuring that the hydraulic spear is concentric with the pipe string in the well; the pressure cover 23 prevents the ball bearing 22 from leaving the positioning hole on the centering body 21.

[0022] The first O-ring 24 is nested in the annular hole on the inner surface of the gland 23 and contacts the surface of the ball 22 ; the first O-ring 24 is used to prevent debris on the surface of the ball 22 from entering the positioning hole.

[0023] The diameter of the circumscribed circle formed by the surface of the ball balls 22 arranged in the annular array is larger than the outer diameter of the straightening body 21. The outer diameter difference formed by the two can prevent the hydraulic spear from getting stuck by passing through some small obstacles in the pipe.

[0024] The third embodiment of the utility model is basically the same as the first embodiment, mainly in further optimization. The salvage component 3 includes a spear rod 31, a limiting block 32, a spear block 33 and a spear shaft 34; the limiting block 32 is welded to the inner surface of the rectangular groove of the annular array on the spear rod 31; the spear block 33 is slidably connected to the surface of the limiting block through the spear shaft 34; the spear rod 31 is the main supporting structure, and a sealing ring is sleeved on the inner surface of one end of the spear rod 31 that is threadedly connected to the straightening body 21; the limiting block 32 is used to clean the arc surface of the spear block 33, and at the same time has a certain limiting and supporting effect on the spear block 33, and is welded to the spear rod 31; after the spear block 33 is opened to the limit angle, the friction between the protruding rack on the surface and the oil pipe is generated, and finally the oil pipe is salvaged under the action of external pulling force.

[0025] One end of the spear shaft 34 is provided with a blocking screw 35 fixed to the surface of the spear rod 31; the spear shaft 34 is an axis supporting the rotation of the spear block 33, and the blocking screw 35 can prevent the spear shaft 34 from axially disengaging under long-term force vibration, which will cause the spear block 33 to fall off.

[0026] The salvaging component 3 also includes a piston rod 36, a spring 37, a bluff body 38, a second O-ring 39 and a third O-ring 40; the surface of the piston rod 36 is covered with a spring 37, and the outer surface of the end of the piston rod 36 is slidably connected to the inner surface of the straightening body 21; the outer surface of the end of the piston rod 36 is covered with a second O-ring 39 and a third O-ring 40 in sequence; the end of the piston rod 36 is threadedly connected with a bluff body 38; the piston rod 36 is pushed forward to open the lance block 33 for salvaging the oil pipe; the piston rod 36 is pushed backward to retract the lance block 33, which facilitates the movement of the hydraulic lance in the oil pipe; the elastic force of the spring 37 can ensure that the lance block 33 returns to its original state after opening; the function of the bluff body 38 is to generate a pressure difference when the hydraulic oil passes through, and the second O-ring 39 and the third O-ring 40 are mainly to prevent the hydraulic oil from leaking into the cavity where the spring 37 is located.

[0027] Based on this, a typical working process of the utility model is:

[0028] When the utility model is implemented, Figure 1-3 As shown, first place the hydraulic spear in the oil pipe so that the ball bearing 22 is close to the inner wall of the pipe column, and then the salvage component 3 of the device is aligned with the center of the fracture. When drilling, encounter some small obstructions in the pipe, rotate the device, the ball bearing 22 rotates around the obstruction, and after reaching the irregular fracture, use the milling head 4 to mill the irregular position, and then continue to send it in, and the spear block 32 reaches the salvage position. At this time, a certain flow of liquid flows from the straightening body 21 and reaches the cavity. Due to the effect of the bluff body 38 and the inner diameter difference, the inner diameter of the bluff body 38 is small, the flow rate is fast, the pressure is small, and the external pressure of the bluff body 38 is strong, thereby pushing the piston rod 36 to move to the left, and the piston rod 36 pushes the spear block 33 upward. When the piston rod 36 reaches the limit point, the spear block 36 is stretched to the salvage size. At this time, coupled with the rotation of the device itself, after the spear block 32 with spiral serrations firmly grasps the inner diameter of the oil pipe, force can be applied to remove the oil pipe to complete the final salvage operation.

Claims

1. A controllable hydraulic spear for a horizontal well, characterized by: The utility model comprises an upper joint (1), a centering and straightening component (2), a salvaging component (3) and a milling head (4); one end of the centering and straightening component (2) is connected to the internal thread of the upper joint (1), and the other end is connected to the internal thread of the end of the salvaging component (3); the other end of the salvaging component (3) is provided with a milling head (4); and a milling groove (41) in an annular array is provided on the surface of the milling head (4).

2. The controllable hydraulic spear for horizontal wells according to claim 1, characterized in that: The centering and centering component (2) comprises a centering body (21), a ball bearing (22), a pressure cover (23) and a first O-ring (24); the surface of the centering body (21) is rollingly connected to the ball bearing (22) via a positioning hole; and the pressure cover (23) is threadedly connected to the centering body (21) via a screw after being sleeved on the surface of the ball bearing (22).

3. The controllable hydraulic spear for horizontal wells according to claim 2, characterized in that: The first O-type sealing ring (24) is nested in the annular hole on the inner cavity surface of the gland (23) and is in contact with the surface of the ball bearing (22).

4. The controllable hydraulic spear for horizontal wells according to claim 2, characterized in that: The diameter of the circumscribed circle formed by the surface of the ball (22) is greater than the outer diameter of the straightening body (21).

5. The controllable hydraulic spear for horizontal wells according to claim 1, characterized in that: The salvaging component (3) comprises a lance rod (31), a limiting block (32), a lance block (33) and a lance shaft (34); the limiting block (32) is welded to the inner surface of the rectangular groove of the annular array on the lance rod (31); and the lance block (33) is slidably connected to the surface of the limiting block via the lance shaft (34).

6. The controllable hydraulic spear for horizontal wells according to claim 5, characterized in that: One end of the lance shaft (34) is provided with a blocking screw (35) fixed on the surface of the lance rod (31).

7. The controllable hydraulic spear for horizontal wells according to claim 5, characterized in that: The salvaging component (3) further comprises a piston rod (36), a spring (37), a bluff body (38), a second O-type sealing ring (39) and a third O-type sealing ring (40); the spring (37) is sleeved on the surface of the piston rod (36); the outer surface of the end of the piston rod (36) is slidably connected to the inner surface of the straightening body (21); the second O-type sealing ring (39) and the third O-type sealing ring (40) are sleeved on the outer surface of the end of the piston rod (36) in sequence; and the bluff body (38) is threadedly connected to the end of the piston rod (36).

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