A coal bed gas horizontal well plug fishing device

Abstract

The utility model discloses a coal bed gas horizontal well plug -fishing device, including the oil pipe of going into the horizontal well and the auxiliary spare of installing in the oil pipe end, the auxiliary spare includes the fishing barrel main part and installs the connecting joint at the one end of fishing barrel main part, the inside rotation of fishing barrel main part is connected with a plurality of hinged baffle at the one end of being away from connecting joint, wherein the bottom of hinged baffle is connected to the inner wall of fishing barrel main part through spring, and the flow channel is reserved between two adjacent hinged baffles. The application is applied in reverse circulation fishing method through increasing auxiliary spare in the end of oil pipe, and small particle plug -fishing is carried to the ground from the circulation liquid export through flow channel and then enters the oil pipe, then, large particle plug -fishing is temporarily left in the oil pipe and fishing barrel main part of horizontal section, and is carried to the ground after being lifted oil pipe after ending fishing, and the detachable cooperation connection of oil pipe and fishing auxiliary spare can prevent the pebble in the fishing barrel main part from falling into the horizontal well again.

Description

Technical Field

[0001] This utility model relates to the field of coalbed methane operation and salvage technology, specifically to a coalbed methane horizontal well blockage salvage device. Background Technology

[0002] During the production process of horizontal coalbed methane wells, foreign matter gradually accumulates in the production casing, which can clog the production pump and reduce the flow capacity of the production well to formation water and coalbed methane. The main sources of foreign matter generated during this process include the following three aspects: First, coal dust and fracturing sand carried into the wellbore by coalbed methane and formation water flowing out of the coal seam; second, debris falling off due to corrosion of the production casing and wear of the screw; and third, fragments remaining from the bridge plugs used during fracturing.

[0003] Currently, when retrieval of blockages in horizontal coal seam wells, the blockages enter the retrieval tubing. During the tubing's lifting process, the blockages inside the tubing fall back into the horizontal well under gravity, thus preventing effective retrieval of the blockages. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to solve the problem that when the blockage in the tubing falls back into the horizontal well during the retrieval and lifting of the blockage.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A device for retrieving blockages in a horizontal coalbed methane well includes an oil pipe extending into the horizontal well and an auxiliary component installed at the end of the oil pipe; The auxiliary components include a retrieval tube body and a connecting joint installed at one end of the retrieval tube body. The main body of the retrieval cylinder is internally connected to several hinged baffles at the end away from the connecting joint. The bottom of the hinged baffles is connected to the inner wall of the retrieval cylinder body by springs, and a flow channel is reserved between two adjacent hinged baffles.

[0007] This application, by adding a retrieval auxiliary component to the end of the tubing, can be applied in reverse circulation retrieval methods (suitable for formations with no or slight leakage). Blockages enter the tubing in real time through the flow channel and are then carried out to the surface from the circulating fluid outlet, resulting in high efficiency. The tubing and retrieval auxiliary component are detachably connected, making installation and replacement convenient. Several hinged baffles designed internally can prevent gravel and other debris that have entered the retrieval auxiliary component from re-entering the horizontal well. The structure is reasonable and the operation is simple.

[0008] As a further embodiment of this utility model: the hinge baffles are evenly distributed 10cm away from the nearest port of the retrieval body.

[0009] As a further embodiment of this utility model: the hinge baffle is connected to the inner wall of the main body of the retrieval device by a limiting hinge, and the rotation range of the hinge baffle on the inner wall of the main body of the retrieval device is 0°-90°.

[0010] As a further embodiment of this utility model: both the main body of the retrieval tube and the connecting joint are hollow inside and connected to each other.

[0011] As a further embodiment of this utility model, the hinge baffle is generally in the shape of a triangular plate.

[0012] As a further embodiment of this utility model: a surface pumping device is installed at the wellhead of the horizontal well. The surface pumping device provides power so that the circulating fluid passes sequentially through the circulating fluid inlet at the wellhead of the horizontal well, the annulus between the tubing and the casing of the horizontal well, the main body of the retrieval cylinder, the tubing, and the circulating fluid outlet at the wellhead of the horizontal well, thereby bringing the blockage from the coalbed methane horizontal well to the surface.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This application, by adding a retrieval auxiliary component to the end of the tubing, can be applied in reverse circulation retrieval methods (suitable for formations with no or slight leakage). Smaller fracturing sand and coal dust are introduced into the tubing through the flow channel and then carried out to the surface from the circulating fluid outlet; larger particles of blockage are temporarily retained in the horizontal section of the tubing and the retrieval tube body, and are carried out to the surface through the lifting tubing after retrieval is completed; the tubing and retrieval auxiliary component are detachably connected, making installation and replacement convenient; the internally designed hinged baffles can prevent gravel and other debris that have entered the retrieval tube body from falling back into the horizontal well; the structure is reasonable and the operation is simple. 2. This application relies on surface pumping equipment to provide power, allowing circulating fluid to flow from the annulus between the tubing and casing into the tubing, establishing circulation. The circulating fluid, which mixes fracturing sand, coal powder, and solid debris, flows towards the retrieval tube. Under the impact of the water flow, the limiting baffle opens inward, and the sand and debris enter the retrieval tube with the water flow. When the surface pumping equipment is shut down or the pump speed is reduced, the impact force on the baffle is less than the spring force, and the baffle closes, thereby preventing the debris that has already entered from falling back into the horizontal well. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall shape of the salvage auxiliary component according to an embodiment of the present utility model; Figure 2 This is an embodiment of the present utility model. Figure 1 Sectional view of plane AA; Figure 3 This is a top view of several hinged baffles according to an embodiment of the present utility model; Figure 4 This is an embodiment of the present utility model. Figure 2 Enlarged view of area A in the image; Figure 5 This is a schematic diagram illustrating the application of the salvage auxiliary component in the reverse circulation salvage method according to an embodiment of this utility model; Explanation of reference numerals in the attached figures: 1. Main body of the retrieval tube; 2. Connecting joint; 3. Hinged baffle; 4. Spring; 5. Flow channel; 6. Limiting hinge; 7. Circulating fluid outlet; 8. Circulating fluid inlet; 9. Casing; 10. Oil tubing; 11. Blockage; 12. Artificial well bottom. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] Example 1 Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 A device for retrieving blockages in a horizontal coalbed methane well includes a retrieval cylinder body 1, a connecting joint 2, a hinged baffle 3, a spring 4, a flow channel 5, and a limiting hinge 6. The retrieval cylinder body 1 and the connecting joint 2 are hollow inside and are integrally formed. The connecting joint 2 is used to thread a tubing 10. The retrieval cylinder body 1 and the connecting joint 2 are connected in the middle.

[0017] Reference Figure 1 and Figure 3 The main body 1 of the retrieval cylinder has several hinged baffles 3 installed inside at the end away from the connecting joint 2. The hinged baffles 3 are arranged in a circular array inside the main body 1 of the retrieval cylinder, and a flow channel 5 is reserved between two adjacent hinged baffles 3 (see reference). Figure 3 The flow channel 5 allows smaller coal powder and fracturing sand to pass through.

[0018] It should be noted that the hinge baffles 3 are evenly distributed 10cm from the nearest port of the main body 1 of the retrieval cylinder, and the specific number of hinge baffles 3 is determined according to the actual situation. It is necessary to reserve a gap for the flow channel 5. This application does not limit the number of hinge baffles 3.

[0019] Furthermore, one end of the spring 4 is connected to the hinge baffle 3, and the other end is connected to the inner wall of the retrieval tube body 1. The spring 4 provides elastic force so that the hinge baffle 3 remains perpendicular to the retrieval tube body 1 when no external force is applied (see reference). Figure 2 ).

[0020] Reference Figure 2 and Figure 4 The hinge baffle 3 is connected to the inner wall of the main body 1 of the retrieval device by a high-strength limiting hinge 6, so that the hinge baffle 3 can only rotate within a 90° range with the inner wall of the main body 1 of the retrieval device. When the hinge baffle 3 rotates 90°, it is in contact with the inner wall of the main body 1 of the retrieval device. At this time, the area of ​​the flow channel 5 will increase, and large particles of impurities will enter the interior of the retrieval cylinder body 1 and move towards the connecting joint 2. After entering the interior of the retrieval cylinder body 1, the hinge baffle 3 will be reset under the action of the spring 4, which can prevent large particles of impurities that have entered the retrieval cylinder body 1 from falling out again.

[0021] Example 2 Application of a coalbed methane horizontal well blockage retrieval device in reverse circulation retrieval method (suitable for formations with no or slight leakage), such as... Figure 5 As shown, it includes the following steps: (1) Close the screw pump in the horizontal well, open the casing pressure valve, and release the casing pressure to atmospheric pressure; (2) Raise the production tubing, including rods, tubing, screw pump, gas anchor, tailpipe and sand sinker, from the wellhead in the horizontal well; (3) Connect the front end of the oil pipe 10 to the main body of the salvage cylinder 1 through the connecting joint 2; (4) Connect the oil pipes 10 one by one using the pump inspection vehicle and lower them to the horizontal section; (5) Start the surface pumping equipment and inject the circulating fluid into the annulus between the tubing 10 and the casing 9 through the circulating fluid inlet 8. The circulating fluid carries the blockage 11 in the coalbed methane horizontal well into the end of the retrieval tube body 1. The blockage 11, such as fracturing sand and coal powder, enters the tubing 10 through the flow channel 5 in the retrieval tube body 1. Then, under the action of the surface pumping equipment, it is carried out to the surface through the circulating fluid outlet 7. The remaining bridge plug fragments and some gravel cannot be carried out by the circulating fluid and remain in the retrieval tube body 1 and tubing 10 in the horizontal section of the horizontal well. It should be noted that the circulating fluid inlet 8 and the circulating fluid outlet 7 are the installation swivel joints, which are installed at the outlet and inlet of the ground pumping equipment.

[0022] It should be noted that the length of a single tubing in this application is approximately 10 meters. Adjacent tubing sections are threaded together, with the front end of the foremost tubing 10 directly connected to the main body 1 of the retrieval tube. The diameter of the main body 1 of the retrieval tube is larger than the diameter of the tubing 10. The inner diameter of the horizontal wellbore is approximately 110 mm, the outer diameter of the tubing 10 is approximately 73 mm, and the outer diameter of the main body 1 of the retrieval tube is approximately 102 mm. In actual use, the length of the tubing 10 can be increased according to the length of the horizontal well. Since the tubing 10 and the main body 1 of the retrieval tube have sufficient length, there will be no blockage that renders the tubing unusable.

[0023] (6) While circulating, lower the tubing. When the retrieval device is about 10 meters away from the bottom of the man-made well 12, the retrieval operation is completed. The retrieval string (tubing 10 and retrieval cylinder body 1) is pulled out, and the bridge plug fragments and gravel remaining in the tubing are brought to the ground. The retrieval device is then removed. (7) Lower the sand sinker, tailpipe, gas anchor, screw pump, tubing and oil rod, etc., and resume drainage operations.

[0024] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for retrieving blockages in a coalbed methane horizontal well, characterized in that, Includes tubing (10) that extends into the horizontal well and auxiliary components that are detachably installed at the end of tubing (10); The auxiliary components include a retrieval tube body (1) and a connecting joint (2) installed at one end of the retrieval tube body (1). The main body (1) of the retrieval tube is internally connected to a number of hinged baffles (3) at the end away from the connecting joint (2). The bottom of the hinged baffles (3) is connected to the inner wall of the main body (1) of the retrieval tube by a spring (4). A flow channel (5) is reserved between two adjacent hinged baffles (3). The front end of the oil pipe (10) is connected to the main body of the retrieval tube (1) through the connecting joint (2). Both the main body of the retrieval tube (1) and the connecting joint (2) are hollow inside and connected to each other.

2. The device for retrieving blockages in a coalbed methane horizontal well according to claim 1, characterized in that: Several hinged baffles (3) are evenly distributed 10 cm from the nearest port of the main body (1) of the retrieval tube.

3. The device for retrieving blockages in a coalbed methane horizontal well according to claim 1, characterized in that: The hinge baffle (3) is connected to the inner wall of the retrieval tube body (1) by a limiting hinge (6), and the hinge baffle (3) has a rotation range of 0°-90° on the inner wall of the retrieval tube body (1).

4. The device for retrieving blockages in a coalbed methane horizontal well according to claim 1, characterized in that: The hinge baffle (3) has a triangular plate-shaped structure.

5. The device for retrieving blockages in a coalbed methane horizontal well according to claim 1, characterized in that: A surface pumping device is installed at the wellhead of the horizontal well. The surface pumping device provides power so that the circulating fluid passes through the circulating fluid inlet (8) at the wellhead of the horizontal well, the tubing (10) and the annulus of the casing (9) of the horizontal well, the main body of the retrieval cylinder (1), the tubing (10), and the circulating fluid outlet (7) at the wellhead of the horizontal well, thereby bringing the blockage from the coalbed methane horizontal well to the surface.

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