Overflow type differential pressure sliding sleeve

Abstract

The utility model belongs to the technical field of oilfield development equipment, and particularly provides an overflowing type differential pressure sliding sleeve which comprises a supporting rod, an outer sleeve, a sliding sleeve and a supporting rod seat, the sliding sleeve is sleeved in the outer sleeve, the supporting rod seat is connected in the upper end of the sliding sleeve, and the center of the supporting rod seat is vertically connected with a supporting rod. The problem that sealing oil extraction can be achieved only by replacing a one-way valve of a tubular pump of a tubular column used in an existing oil production well is solved. A one-way valve of the tubular pump does not need to be replaced, and sealing oil pumping can be achieved only by installing the overflowing type differential pressure sliding sleeve at the lower end of a ball seat of the tubular pump.

Description

Technical Field

[0001] The utility model belongs to the technical field of oilfield development equipment, and particularly relates to a flow-through differential pressure sliding sleeve. Background Technique

[0002] In recent years, due to the in-depth exploration and development of oil and gas, the oil industry has developed very rapidly. And with the sharp increase in the domestic consumption of oil and gas resources, it is necessary to vigorously develop oil exploration and development technologies to meet the demand. While vigorously developing the separate injection process for injection wells, Changqing Oilfield has actively carried out research and experiments on the separate production process for production wells. The tubular pump of the pipe string used in existing separate production wells needs to replace the check valve to achieve sealed oil production. The original check valve is prone to scale formation at the setting valve, resulting in seal failure. As time goes by, the liquid level in the casing-tubing annulus continuously rises. When the liquid level rises to the wellhead, the liquid in the wellbore overflows, which not only affects the environment but also affects the productivity of the oil well. Therefore, it is necessary to improve the original check valve.

[0003] The Chinese patent document with the publication number CN210714598U discloses a differential pressure sliding sleeve and a water injection pipe string, which relates to the technical field of oil and gas drilling and production, and is used to solve the technical problems that the existing water injection method is prone to failure and the maintenance operation is cumbersome. The differential pressure sliding sleeve includes: a body and a sliding sleeve; a central channel is further formed on the body, and the central channel penetrates the body along the axial direction of the body; and an over-flow channel is formed on the side wall of the body, and the over-flow channel penetrates the side wall; the sliding sleeve is sleeved on the body, and a pressure chamber communicating with the over-flow channel is formed between the sliding sleeve and the body; a first connecting piece fixedly connected to the side wall of the body is arranged on the sliding sleeve; when the fluid pressure in the pressure chamber is greater than the preset pressure, the first connecting piece is disconnected, and the sliding sleeve can move relative to the body along the axial direction of the body, so that the tubing is communicated with the casing-tubing annulus. The differential pressure sliding sleeve and the water injection pipe string are used for injecting water into the formation to reduce the failure rate of the differential pressure sliding sleeve. However, this document does not solve the problem that the tubular pump of the pipe string used in existing separate production wells needs to replace the check valve to achieve sealed oil production. Content of the Utility Model

[0004] The flow-through differential pressure sliding sleeve provided by the utility model aims to overcome the problem that the tubular pump of the pipe string used in the production well in the prior art needs to replace the check valve to achieve sealed oil production.

[0005] To this end, the utility model provides a flow-through differential pressure sliding sleeve, which includes a support rod, an outer sleeve, a sliding sleeve and a support rod seat. The sliding sleeve is sleeved inside the outer sleeve. The upper end of the sliding sleeve is internally connected to the support rod seat, and the support rod is vertically connected to the center of the support rod seat.

[0006] Preferably, a steel ball top claw is arranged on the upper surface of the support rod.

[0007] Preferably, the flow-through differential pressure sliding sleeve further includes a limit block, which is sleeved inside the outer sleeve and located above the sliding sleeve.

[0008] Preferably, the flow-through differential pressure sliding sleeve further includes limit pins, and the lower part of the sliding sleeve and the outer sleeve are connected by a plurality of limit pins.

[0009] Preferably, the flow-through differential pressure sliding sleeve further includes shear pins, and the upper part of the sliding sleeve and the outer sleeve are connected by a plurality of shear pins.

[0010] Preferably, a plurality of first liquid outlet holes are formed in the sliding sleeve.

[0011] Preferably, a plurality of second liquid outlet holes are formed in the outer sleeve.

[0012] Preferably, both the first liquid outlet hole and the second liquid outlet hole are radial through holes.

[0013] Preferably, the limit block is annular in shape.

[0014] Preferably, the support rod and the support rod seat are connected by threads.

[0015] Advantages of the present utility model:

[0016] 1. The flow-through differential pressure sliding sleeve provided by the present utility model includes a support rod, an outer sleeve, a sliding sleeve and a support rod seat. The sliding sleeve is sleeved inside the outer sleeve. The upper end of the sliding sleeve is internally connected to the support rod seat, and the center of the support rod seat is vertically connected to the support rod. When in use, the upper end of the flow-through differential pressure sliding sleeve is connected to a tubing pump, and the lower end is connected to downhole tools such as a plug and a packer. The tubing string is lowered into the wellbore. Before the flow-through differential pressure sliding sleeve is triggered, the support rod pushes up the steel ball of the tubing pump body, and the liquid from the surface pump truck flows through the flow-through differential pressure sliding sleeve through the tubing pump to realize the pressure injection and setting of the packer. After the packer is set, the liquid from the surface pump truck pushes the sliding sleeve to move downward. Since the support rod seat is fixed to the sliding sleeve, after the sliding sleeve moves downward, the support rod moves downward, and the steel ball falls into the ball seat, so that sealed oil pumping can be realized. The present utility model does not need to replace the check valve of the tubing pump. Only by installing the flow-through differential pressure sliding sleeve of the present utility model at the lower end of the tubing pump ball seat, sealed oil pumping can be realized.

[0017] 2. The flow-through differential pressure sliding sleeve provided by the present utility model is provided with a steel ball top claw connected above the support rod. Before the flow-through differential pressure sliding sleeve is triggered, the steel ball top claw facilitates pushing up the steel ball of the tubing pump body stably. At the same time, during sealed oil production, the support rod moves downward to ensure that the steel ball easily falls into the ball seat.

[0018] 3. The flow-through differential pressure sliding sleeve provided by the present utility model has multiple first liquid outlet holes opened on the sliding sleeve, and multiple second liquid outlet holes opened on the outer sleeve. The first liquid outlet holes communicate with the second liquid outlet holes, facilitating the liquid flowing through the inside of the sliding sleeve to be discharged outside the outer sleeve, realizing the connection between the oil casing, and reducing the blockage of foreign objects and grit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present utility model will be further described in detail below with reference to the drawings.

[0020] Figure 1 It is a schematic structural diagram of the flow-through differential pressure sliding sleeve.

[0021] Description of reference numerals: 1. Steel ball top claw; 2. Support rod; 3. Outer sleeve; 4. Limit block; 5. Sliding sleeve; 6. Support rod seat; 7. Limit pin; 8. Shearing pin; 9. Fixed pin;

[0022] 31. Second liquid outlet hole;

[0023] 51. First liquid outlet hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The principles and features of the present utility model will be described below with reference to the drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0025] Embodiment 1:

[0026] As Figure 1 shown, a flow-through differential pressure sliding sleeve includes a support rod 2, an outer sleeve 3, a sliding sleeve 5, and a support rod seat 6. The sliding sleeve 5 is sleeved inside the outer sleeve 3. The upper end of the sliding sleeve 5 is internally connected to the support rod seat 6, and the center of the support rod seat 6 is vertically connected to the support rod 2.

[0027] Specifically, during use, the upper end of the flow-through differential pressure sliding sleeve is connected to the tubing pump, and the lower end is connected to downhole tools such as a plug and a packer. The pipe string is lowered into the wellbore. Before the flow-through differential pressure sliding sleeve is triggered, the support rod 2 pushes up the steel ball of the tubing pump body, and the liquid from the surface pump truck flows through the flow-through differential pressure sliding sleeve through the tubing pump to realize the pressure injection and setting of the packer; after the packer is set, the liquid from the surface pump truck pushes the sliding sleeve 5 to move downward. Since the support rod seat 6 is fixed to the sliding sleeve 5, after the sliding sleeve 5 moves downward, the support rod 2 moves downward, and the steel ball falls into the ball seat, realizing sealed oil production.

[0028] Compared with the existing technology in production wells, the tubing pump of the pipe string used needs to replace the check valve to realize sealed oil production. That is, the controllable flow check valve replaces the original ball valve of the tubing, and the functions of tubing pump oil production and sliding sleeve can be realized.

[0029] According to the working conditions and construction requirements of the present utility model, there is no need to replace the one-way valve of the tubular pump. Just install the flow-through differential pressure sliding sleeve of the present utility model at the lower end of the ball seat of the tubular pump, and the packer can be pressured to set and seal the oil extraction. There is no need to disassemble the original valve seat of the tubular pump, and the original oil production supporting tools are not changed.

[0030] Preferably, the upper part of the outer sleeve 3 is connected to the tubular pump by threads. The threaded connection is a detachable connection, which is convenient for operation.

[0031] Embodiment 2:

[0032] On the basis of Embodiment 1, a steel ball top claw 1 is connected to the upper surface of the support rod 2.

[0033] Specifically, before the flow-through differential pressure sliding sleeve is triggered, the steel ball top claw 1 is convenient for stably lifting the steel ball of the tubular pump body. At the same time, when sealing the oil extraction, the support rod 2 moves downward to ensure that the steel ball easily falls into the ball seat.

[0034] Preferably, the flow-through differential pressure sliding sleeve further includes a limit block 4. The limit block 4 is sleeved inside the outer sleeve 3, and the limit block 4 is located above the sliding sleeve 5.

[0035] Specifically, the position of the sliding sleeve 5 is restricted through the limit block 4 to prevent upward movement.

[0036] Preferably, the flow-through differential pressure sliding sleeve further includes limit pins 7. The lower part of the sliding sleeve 5 and the outer sleeve 3 are connected by a plurality of limit pins 7.

[0037] Specifically, the position of the sliding sleeve 5 and the outer sleeve 3 is restricted before pressure application through the limit pins 7. During pressure application, the sliding sleeve 5 is squeezed downward by the liquid pressure to release the limit of the limit pins 7.

[0038] Preferably, the flow-through differential pressure sliding sleeve further includes shear pins 8. The upper part of the sliding sleeve 5 and the outer sleeve 3 are connected by a plurality of shear pins 8.

[0039] Specifically, the position of the sliding sleeve 5 and the outer sleeve 3 is restricted before pressure application through the shear pins 8. At the same time, during pressure application, the shear pins 8 are cut off to facilitate the downward movement of the sliding sleeve 5.

[0040] Preferably, a plurality of first liquid outlet holes 51 are formed in the sliding sleeve 5.

[0041] Specifically, the liquid inside the sliding sleeve 5 is discharged to the outside of the sliding sleeve 5 through the first liquid outlet holes 51.

[0042] Preferably, a plurality of second liquid outlet holes 31 are formed in the outer sleeve 3.

[0043] Specifically, during use, as the sliding sleeve 5 is at different positions within the outer sleeve 3, the first liquid outlet hole 51 is made to communicate or not communicate with the second liquid outlet hole 31. When the first liquid outlet hole 51 communicates with the second liquid outlet hole 31, the oil sleeve connection can be achieved, reducing the blockage by foreign objects and grit.

[0044] Preferably, both the first liquid outlet hole 51 and the second liquid outlet hole 31 are radial through-holes.

[0045] Specifically, the radial through-holes facilitate liquid drainage.

[0046] Preferably, the shape of the limiting block 4 is annular.

[0047] Specifically, the annular limiting block has a simple structure, is convenient for connecting the outer sleeve 3, and fully fits with the upper end of the sliding sleeve 5, with a stable structure.

[0048] Preferably, the support rod 2 and the support rod seat 6 are connected by threads.

[0049] Specifically, the support rod 2 and the support rod seat 6 are connected by threads, and the position of the support rod 2 can be adjusted according to different usage situations.

[0050] Preferably, the support rod seat 6 is provided with a vertical through-hole.

[0051] Specifically, the vertical through-hole facilitates the flow of liquid.

[0052] Preferably, the support rod seat 6 includes an outer ring, a connecting rod, and an inner ring. The inner ring is sleeved within the outer ring through the connecting rod, and the support rod 2 is sleeved within the inner ring.

[0053] Specifically, the support rod seat 6 with this structure has a simple structure, is convenient for connection, and the gap between the outer ring and the inner ring facilitates the flow of liquid.

[0054] Preferably, the flow-through differential pressure sliding sleeve further includes a fixing pin 9, and the support rod seat 6 and the sliding sleeve 5 are connected by the fixing pin 9 to ensure that the support rod seat 6 moves together with the sliding sleeve 5.

[0055] The working principle of the present utility model is as follows:

[0056] During use, the upper end of the flow-through differential pressure sliding sleeve is connected to the tubing pump, and the lower end is connected to downhole tools such as a plug and a packer. The pipe string is lowered into the wellbore. Before the flow-through differential pressure sliding sleeve is triggered, the steel ball top claw 1 on the support rod 2 pushes up the steel ball of the tubing pump body, and the liquid from the surface pump truck flows through the flow-through differential pressure sliding sleeve through the tubing pump to achieve the pressure setting and setting of the packer; after the packer is set, the liquid from the surface pump truck pushes the sliding sleeve 5 to move downward. Since the support rod seat 6 is fixed to the sliding sleeve 5, after the sliding sleeve 5 moves downward, the support rod 2 moves downward, and the steel ball falls into the ball seat, enabling sealed oil pumping.

[0057] In the description of the present utility model, it should be understood that if there are terms such as "front", "interior", "right", etc., indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, 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. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be construed as a limitation on the present utility model.

[0058] The above examples are merely illustrative of the present utility model and do not constitute a limitation on the protection scope of the present utility model. Any design identical or similar to the present utility model falls within the protection scope of the present utility model.

Claims

1. An over-flow differential pressure sliding sleeve, characterized in that: It includes a support rod (2), an outer sleeve (3), a sliding sleeve (5), and a support rod base (6). The outer sleeve (3) sleeved inside with the sliding sleeve (5). The upper end of the sliding sleeve (5) is internally connected to the support rod base (6), and the center of the support rod base (6) is vertically connected to the support rod (2).

2. The flow-through differential pressure sliding sleeve according to claim 1, wherein: A steel ball top claw (1) is arranged and connected on the upper surface of the support rod (2).

3. The flow-through differential pressure sliding sleeve according to claim 1, characterized in that: The flow-through differential pressure sliding sleeve further includes a limit block (4). The limit block (4) is sleeved inside the outer sleeve (3), and the limit block (4) is located above the sliding sleeve (5).

4. The flow-through differential pressure sliding sleeve according to claim 1, wherein: The flow-through differential pressure sliding sleeve further includes limit pins (7). The lower part of the sliding sleeve (5) and the outer sleeve (3) are connected by a plurality of limit pins (7).

5. The flow-through differential pressure sliding sleeve according to claim 1, characterized in that: The flow-through differential pressure sliding sleeve further includes shear pins (8). The upper part of the sliding sleeve (5) and the outer sleeve (3) are connected by a plurality of shear pins (8).

6. The flow-through differential pressure sliding sleeve according to claim 3, wherein: A plurality of first liquid outlet holes (51) are formed in the sliding sleeve (5).

7. The flow-through differential pressure sliding sleeve according to claim 6, wherein: A plurality of second liquid outlet holes (31) are formed in the outer sleeve (3).

8. The flow-through differential pressure sliding sleeve according to claim 7, wherein: Both the first liquid outlet holes (51) and the second liquid outlet holes (31) are radial through holes.

9. The flow-through differential pressure sliding sleeve according to claim 3, wherein: The limit block (4) is annular in shape.

10. The flow-through differential pressure sliding sleeve according to claim 1, wherein: The support rod (2) and the support rod base (6) are connected by threads.

Images