A negative pressure sand flushing and screen pipe cleaning composite plugging removal tool

Abstract

The utility model relates to the technical field of wellbore sand flushing, and specifically to a negative pressure sand flushing and cleaning screen pipe composite unblocking tool, comprising an upper joint, an inner tube sealing cylinder is clamped inside the upper joint, a liquid passing pipe, one end of which is fixedly connected to one end of the upper joint, a bridge nozzle seat, an outer wall of which is fixedly connected to the end of the liquid passing pipe away from the upper joint, the middle part of the bridge nozzle seat close to one end of the upper joint is connected and provided with a nozzle, a throat pipe seat is arranged inside the upper joint, a negative pressure structure is fixedly arranged inside the throat pipe seat, and a jet structure is fixedly arranged at the end of the bridge nozzle seat away from the liquid passing pipe. The utility model realizes three processes of sand flushing, screen pipe unblocking and formation unblocking in one trip of the pipe string, and realizes zero-pressure, zero-pollution effective sand flushing operation and screen pipe unblocking operation for formation fine sand and artificial ground filling sand.

Description

Technical Field

[0001] The utility model relates to the technical field of wellbore sand flushing, in particular to a negative pressure sand flushing and screen pipe cleaning composite plugging removal tool. Background Art

[0002] At present, in the operation of oil and water wells in oil fields, it is difficult to perform sand flushing and unblocking operations on low-pressure wells with large loss of flushing fluid, wells with strong oil sand cementation or high crude oil viscosity, wells with sand plugging that is difficult to flush out, and wells that cannot establish circulation, such as heavy oil wells, horizontal wells, and low-pressure wells. At the same time, in the later production process of horizontal screen completion, screen plugging is the main reason for the decline in production.

[0003] However, the circulating fluid in conventional sand flushing operations will cause liquid column pressure on the bottom layer, causing formation pollution and formation pressure, and the cemented oil sands cannot be completely flushed out; the circulating fluid in conventional screen jet cleaning operations will also cause liquid column pressure on the bottom layer, causing formation pollution and formation pressure; conventional sand flushing operations and conventional screen jet cleaning operations require the separate insertion of related tools and pipe strings; it is impossible to achieve two processes in one trip of the pipe string. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a negative pressure sand flushing and screen cleaning composite unblocking tool to solve the problem of horizontal well screen blockage and wellbore sand flushing.

[0005] Based on the above purpose, the utility model provides a negative pressure sand flushing screen pipe cleaning composite plugging removal tool, comprising:

[0006] The upper joint has an inner tube sealing cylinder provided inside the upper joint;

[0007] A liquid passing pipe, one end of which is fixedly connected to one end of the upper joint;

[0008] A bridge nozzle seat, the outer wall of which is fixedly connected to the end of the liquid pipe away from the upper joint, and a nozzle is connected to the middle part of the bridge nozzle seat near the upper joint;

[0009] A throat pipe seat is arranged inside the upper joint, one end of the throat pipe seat is fixedly connected to one end of the inner pipe sealing cylinder, and the other end of the throat pipe seat is fixedly connected to one end of the bridge nozzle seat;

[0010] A negative pressure structure is fixedly arranged inside the throat seat, and at least one liquid inlet channel connected to the negative pressure structure is arranged on the outer wall of the bridge nozzle seat;

[0011] A jet structure is fixedly arranged at one end of the bridge nozzle seat away from the liquid passing pipe;

[0012] A liquid passage is formed between the upper joint, the inner tube sealing tube, the liquid passage bridge nozzle seat and the throat pipe seat, and the interior of the bridge nozzle seat is connected to the liquid passage.

[0013] Preferably, the negative pressure structure includes a throat pipe, one end of which is fixed inside the throat pipe seat and the other end is fixed with a diffuser, the diffuser abuts against one end of the throat pipe seat close to the inner tube sealing cylinder, and the throat pipe is connected to the liquid inlet channel.

[0014] Preferably, a positioning block is sleeved on the nozzle, the inner wall of the positioning block is clamped on the nozzle, the outer wall of the positioning block is clamped between the throat seat and the bridge nozzle seat, and the positioning block is connected to the liquid inlet channel.

[0015] Preferably, the jet structure comprises:

[0016] A jet pipe, one end of which is fixedly connected to an end of the bridge nozzle seat away from the liquid pipe;

[0017] A lower joint, one end of which is fixedly connected to an end of the jet pipe away from the bridge nozzle seat;

[0018] The jet rotator is sleeved on the jet tube, the jet rotator is rotatably connected to the jet tube, and the jet tube and the jet rotator are arranged in a flow connection.

[0019] Preferably, thrust bearings are provided at both ends of the jet rotator, each of the thrust bearings is sleeved on the jet tube, the inner ring of each thrust bearing is fixedly connected to the jet tube, and the outer ring of each thrust bearing is respectively fixedly connected to one end of the jet rotator.

[0020] Preferably, an annular water collecting groove is provided on the inner wall of the jet rotator, a plurality of liquid outlet holes connected with the annular water collecting groove are provided on the jet tube, a plurality of lateral holes connected with the outer wall of the jet rotator are provided along the tangential direction of the annular water collecting groove, and a plurality of inclined holes are provided between the end of the jet rotator close to the lower joint and connected with the annular water collecting groove in an inclined state.

[0021] Beneficial effects of the utility model:

[0022] 1. One trip of the string can realize three processes: sand flushing, screen pipe unblocking and formation unblocking;

[0023] 2. High-speed fluid breaks up and lifts up the settled sand, making the sand flushing more thorough;

[0024] 3.360° rotating jet cleaning screen tube, clearing blockage more thoroughly:

[0025] 4. The double-tube negative pressure structure is used to prevent the circulating fluid from causing pollution and pressure to the formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the jet rotating body of the utility model embodiment;

[0029] Figure 3 It is a schematic diagram of the liquid flow direction of the negative pressure sand flushing and screen pipe cleaning composite unblocking tool according to an embodiment of the utility model.

[0030] The markings in the figure are:

[0031] 1. Upper joint; 2. Inner tube sealing tube; 3. Throat seat; 4. Diffuser; 5. Throat; 6. Liquid pipe; 7. Nozzle; 8. Positioning block; 9. Bridge nozzle seat; 10. Jet tube; 11. Thrust bearing; 12. Jet rotating body; 13. Lower joint; 14. Annular water collecting trough; 15. Liquid outlet; 16. Lateral hole; 17. Oblique hole. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0033] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] like Figures 1 to 3As shown, a negative pressure sand flushing screen pipe cleaning composite plugging removal tool comprises:

[0035] The upper joint 1 has an inner tube sealing cylinder 2 clamped inside, and a supporting structure is provided on the inner tube sealing cylinder 2 to facilitate clamping of the inner tube sealing cylinder 2 and the upper joint 1;

[0036] A liquid passing pipe 6, one end of which is fixedly connected to one end of the upper connector 1;

[0037] A bridge nozzle seat 9, the outer wall of which is fixedly connected to the end of the liquid pipe 6 away from the upper joint 1, and the middle part of the bridge nozzle seat 9 close to the upper joint 1 is connected to a nozzle 7;

[0038] A throat pipe seat 3 is arranged inside the upper joint 1, one end of the throat pipe seat 3 is fixedly connected to one end of the inner tube sealing tube 2, and the other end is fixedly connected to one end of the bridge nozzle seat 9;

[0039] The negative pressure structure is fixed inside the throat seat 3, and at least one liquid inlet channel connected to the negative pressure structure is provided on the outer wall of the bridge nozzle seat 9;

[0040] The jet structure is fixedly mounted on one end of the bridge nozzle seat 9 away from the liquid pipe 6;

[0041] A liquid passage is formed between the upper joint 1, the inner tube sealing tube 2, the liquid passage pipe 6, the bridge nozzle seat 9 and the throat pipe seat 3, and the interior of the bridge nozzle seat 9 is connected to the liquid passage.

[0042] For example, the device is connected to the lower end of the process construction pipe column and is used in conjunction with a double-layer pipe. When liquid is injected into the double-layer pipe annulus, the power fluid is divided into two liquid flows after passing through the liquid pipe 6 to the bridge nozzle seat 9. One liquid flow passes through the liquid hole at the front end of the bridge nozzle seat 9 and enters the front cavity of the bridge nozzle seat 9 to reach the nozzle 7. A high-pressure jet is formed through the throttling effect of the nozzle 7, and a local negative pressure is formed through the negative pressure structure, thereby forming a negative pressure suction effect on the formation. The other liquid flow passes through the liquid hole at the rear end of the bridge nozzle seat 9 and enters the jet structure. Under the action of the jet structure, the liquid flow forms a high-speed jet to clean and unblock the screen pipe 360° without dead angles. While cleaning the screen pipe, the cemented oil sand deposited at the bottom of the screen pipe can be flushed and crushed. The sand-carrying liquid under the negative pressure seat inside the tool is sucked into the negative pressure chamber and then mixed with the power fluid again and discharged from the ground through the inner pipe, realizing the three processes of sand flushing, screen unblocking and formation unblocking in one trip of the pipe string, and realizing zero-pressure, zero-pollution effective sand flushing and screen unblocking operations for formation fine sand and artificial ground filling sand.

[0043] As an optional embodiment, the negative pressure structure includes a throat pipe 5, one end of which is fixed inside the throat pipe seat 3, and the other end is fixed with a diffuser 4, the diffuser 4 is abutted against one end of the throat pipe seat 3 close to the inner tube sealing tube 2, and the throat pipe 5 is connected to the liquid inlet channel.

[0044] For example, the throat 5 and the diffuser 4 form a local negative pressure through cooperation, thereby forming a negative pressure suction effect on the formation.

[0045] As an optional embodiment, a positioning block 8 is sleeved on the nozzle 7, the inner wall of the positioning block 8 is clamped on the nozzle 7, the outer wall of the positioning block 8 is clamped between the throat seat 3 and the bridge nozzle seat 9, and the positioning block 8 is connected to the liquid inlet channel.

[0046] As an optional embodiment, the jet structure includes:

[0047] A jet pipe 10, one end of which is fixedly connected to an end of the bridge nozzle seat 9 away from the liquid pipe 6;

[0048] A lower joint 13, one end of which is fixedly connected to an end of the jet pipe 10 away from the bridge nozzle seat 9;

[0049] The jet rotator 12 is sleeved on the jet tube 10 , the jet rotator 12 is rotatably connected to the jet tube 10 , and the jet tube 10 and the jet rotator 12 are communicated with each other.

[0050] For example, the liquid flows into the jet tube 10 through the liquid hole at the rear end of the bridge nozzle seat 9. The liquid flows rotate under the action of the rotating jet body to form a high-speed jet body to clean and unblock the screen pipe 360° without dead angles. While cleaning the screen pipe, the cemented oil sand deposited at the bottom of the screen pipe can be flushed and crushed.

[0051] As an optional embodiment, thrust bearings 11 are provided at both ends of the jet rotating body 12, each of the thrust bearings 11 is sleeved on the jet tube 10, the inner ring of each thrust bearing 11 is fixedly connected to the jet tube 10, and the outer ring of each thrust bearing 11 is fixedly connected to one end of the jet rotating body 12 respectively.

[0052] For example, thrust bearings 11 are provided at both ends of the rotating jet body to reduce rotational friction and extend service life.

[0053] As an optional embodiment, an annular water collecting groove 14 is provided on the inner wall of the jet rotating body 12, and a plurality of liquid outlet holes 15 connected to the annular water collecting groove 14 are provided on the jet tube 10. The annular water collecting groove 14 is provided with a plurality of lateral holes 16 connected to the outer wall of the jet rotating body 12 along the tangential direction. The end of the jet rotating body 12 close to the lower joint 13 is connected to the annular water collecting groove 14 in an inclined state and is provided with a plurality of oblique holes 17.

[0054] For example, the middle of the rotating jet body is provided with a lateral hole 16, which can make the rotating jet body rotate, and the rear end of the rotating jet body is provided with an oblique hole 17, which can break and lift the cemented oil sand.

[0055] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A negative pressure sand flushing screen pipe cleaning composite plugging removal tool, characterized in that: include: An upper joint (1) is internally provided with an inner tube sealing cylinder (2); A liquid passing pipe (6), one end of which is fixedly connected to one end of the upper joint (1); A bridge nozzle seat (9), the outer wall of which is fixedly connected to the end of the liquid pipe (6) away from the upper joint (1), and a nozzle (7) is provided in the middle of the end of the bridge nozzle seat (9) close to the upper joint (1); A throat pipe seat (3) is arranged inside the upper joint (1), one end of the throat pipe seat (3) is fixedly connected to one end of the inner tube sealing cylinder (2), and the other end is fixedly connected to one end of the bridge nozzle seat (9); A negative pressure structure is fixedly arranged inside the throat pipe seat (3), and at least one liquid inlet channel connected to the negative pressure structure is arranged on the outer wall of the bridge nozzle seat (9); A jet structure is fixedly mounted on an end of the bridge nozzle seat (9) away from the liquid passage pipe (6); A liquid passage is formed between the upper joint (1), the inner tube sealing tube (2), the liquid passage pipe (6), the bridge nozzle seat (9) and the throat pipe seat (3), and the interior of the bridge nozzle seat (9) is connected to the liquid passage.

2. A negative pressure sand flushing and screen pipe cleaning composite plugging removal tool according to claim 1, characterized in that: The negative pressure structure comprises a throat pipe (5), one end of which is fixedly arranged inside the throat pipe seat (3), and the other end of which is fixedly provided with a diffusion pipe (4), the diffusion pipe (4) abutting against one end of the throat pipe seat (3) close to the inner tube sealing cylinder (2), and the throat pipe (5) is connected to the liquid inlet channel.

3. A negative pressure sand flushing and screen pipe cleaning composite plugging removal tool according to claim 1, characterized in that: A positioning block (8) is sleeved on the nozzle (7), the inner wall of the positioning block (8) is clamped on the nozzle (7), the outer wall of the positioning block (8) is clamped between the throat seat (3) and the bridge nozzle seat (9), and the positioning block (8) is connected to the liquid inlet channel.

4. A negative pressure sand flushing and screen pipe cleaning composite plugging removal tool according to claim 1, characterized in that: The jet structure comprises: A jet pipe (10), one end of which is fixedly connected to an end of the bridge nozzle seat (9) away from the liquid pipe (6); A lower joint (13), one end of which is fixedly connected to an end of the jet tube (10) away from the bridge nozzle seat (9); The jet rotator (12) is sleeved on the jet tube (10), the jet rotator (12) is rotatably connected to the jet tube (10), and the jet tube (10) and the jet rotator (12) are arranged in a flow relationship.

5. A negative pressure sand flushing and screen pipe cleaning composite plugging removal tool according to claim 4, characterized in that: Thrust bearings (11) are provided at both ends of the jet rotating body (12), each of the thrust bearings (11) is sleeved on the jet tube (10), the inner ring of each thrust bearing (11) is fixedly connected to the jet tube (10), and the outer ring of each thrust bearing (11) is fixedly connected to one end of the jet rotating body (12).

6. A negative pressure sand flushing and screen pipe cleaning composite plugging removal tool according to claim 4, characterized in that: An annular water collecting groove (14) is provided on the inner wall of the jet rotating body (12); a plurality of liquid outlet holes (15) connected to the annular water collecting groove (14) are provided on the jet pipe (10); a plurality of lateral holes (16) connected to the outer wall of the jet rotating body (12) are provided along the tangential direction of the annular water collecting groove (14); and a plurality of oblique holes (17) are provided between the end of the jet rotating body (12) close to the lower joint (13) and connected to the annular water collecting groove (14) in an inclined state.

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