Coiled tubing ball injection assistor

Abstract

The utility model relates to the technical field of oil-gas exploration, and discloses a coiled tubing ball throwing assistor which comprises a straight pipe, and an upper conical surface hole, a straight hole and a lower conical surface hole which are communicated with one another and are coaxial are sequentially formed in the straight pipe from top to bottom; the diameter of an upper port of the upper conical surface hole is larger than that of a lower port of the upper conical surface hole, the diameter of the straight hole is larger than that of the lower port, the diameter of an upper opening of the lower conical surface hole is the same as that of the straight hole, and the diameter of a lower opening of the lower conical surface hole is larger than that of the upper opening. By means of the auxiliary function of the coiled tubing ball throwing assistor, a hand ball cannot be thrown into a gap between a gas production tree and the coiled tubing when the ball is thrown into the coiled tubing, and it can be guaranteed that the thrown ball can safely and accurately fall into the coiled tubing at a time.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas exploration, and particularly relates to a coiled tubing ball throwing auxiliary device. Background Art

[0002] When conducting downhole operations with coiled tubing and tools, it is necessary to support ball throwing to release downhole tools to handle special abnormal situations, thereby establishing an effective channel between the coiled tubing and the formation, which is helpful for subsequent measures.

[0003] With the continuous deepening of exploration and development, in order to obtain high-efficiency industrial oil and gas flows, low-porosity and extra-low-permeability reservoirs usually adopt the pumping bridge plug fracturing process, and the scale of fracturing transformation is continuously increasing. Downhole isolation tools are mostly equipped with fully soluble bridge plugs. Drawing on shale gas production technology, after fracturing in tight gas reservoirs, it is necessary to run coiled tubing to clean the well or sweep the plug. The tool string for sweeping the plug is combined from bottom to top as coiled tubing (φ50.8 - 58.4mm), connector, release tool, positive displacement motor (φ89mm), and mill (φ105 - 114mm).

[0004] Compared with the previous development, in recent years, the horizontal section of fractured wells has increased, the single-stage sand addition scale has increased, the formation water salinity is low and the bridge plugs dissolve incompletely, and objective factors such as formation sand production have an impact. Coupled with the poor sand suspension property of the liquid, resulting in a large amount of sand settling in the horizontal well section, limited coiled tubing circulation displacement, and subjective factors such as the operation of running and pulling out the coiled tubing sweeping plug tool, situations such as sand jamming, sand burial, and ineffective lifting of the drilling and milling tools may occur during the operation process.

[0005] To quickly solve the above problems, it is necessary to cut and hang the coiled tubing on the ground, pump and throw the ball to release the coiled tubing and the drilling and milling tools, so as to establish a circulation between the coiled tubing and the formation, which is convenient for pulling out the coiled tubing or directly putting it into production. However, due to the large gap between the inner wall of the gas production tree and the coiled tubing, and the small diameter of the release ball, the thrown ball cannot be accurately aligned and fall into the coiled tubing, and is easily dropped into the gap between the inner wall of the gas production tree and the coiled tubing. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the problem of inaccurate ball throwing existing in the prior art, and provide a coiled tubing ball throwing auxiliary device. Through the auxiliary effect of this coiled tubing ball throwing auxiliary device, when throwing the ball into the coiled tubing, the release ball will not be dropped into the gap between the gas production tree and the coiled tubing, and it can ensure that the thrown ball can fall into the coiled tubing once, safely and accurately.

[0007] To achieve the above purpose, the utility model provides a coiled tubing ball throwing auxiliary device, which includes a straight pipe. An upper tapered hole, a straight hole, and a lower tapered hole that are mutually connected and coaxial are sequentially arranged from top to bottom in the straight pipe;

[0008] The diameter of the upper port of the upper conical surface is larger than the diameter of the lower port of the upper conical surface, the diameter of the straight hole is larger than the diameter of the lower port, the diameter of the upper opening of the lower conical surface is the same as the diameter of the straight hole, and the diameter of the lower opening of the lower conical surface is larger than the diameter of the upper opening.

[0009] Optionally, a hanging seat is formed at the top end of the straight hole and is arranged around the lower end port; the hanging seat can hang the coiled tubing ball-dropping assistant on the upper end of the coiled tubing.

[0010] Optionally, the plane where the hanger is located is perpendicular to the side wall of the straight hole; by setting the plane where the hanger is located and the side wall of the straight hole to be perpendicular, the connection stability between the hanger and the coiled tubing is improved.

[0011] Optionally, the width of the hanger is 5-7 mm. By setting the width of the hanger to 5-7 mm, the horizontal displacement of the coiled tubing pitching assisting device is limited without falling off, thereby obtaining a better pitching effect.

[0012] Optionally, the outer diameter of the straight pipe is 115-125 mm. By setting the outer diameter of the straight pipe to 115-125 mm, the gap between the straight pipe and the inner wall of the gas tree is smaller than the diameter of the pitched ball, so that the pitched ball will not fall into the gap.

[0013] Optionally, the diameter of the lower port is 46-55 mm; by setting the diameter of the lower port to 46-55 mm, the ball can have sufficient space to fall from the lower port of the upper conical hole into the straight hole.

[0014] Optionally, the diameter of the lower opening is 55-68 mm; by setting the diameter of the lower opening to 55-68 mm, the lower conical surface forms a guiding function, and the coiled tubing can be quickly guided and extended into the straight hole.

[0015] Optionally, the length of the straight tube is 180-220 mm.

[0016] Optionally, the height of the upper conical hole is greater than 25 mm. By setting the height of the upper conical hole to be greater than 25 mm, which is greater than the diameter of a general pitched ball, it is easy to make pitching smoother.

[0017] Optionally, the height of the lower conical surface is 50-70 mm; this further improves the guiding effect on the coiled tubing.

[0018] Through the above technical solution, with the assistance of the coiled tubing ball throwing assistant, the handball will not be dropped into the gap between the gas tree and the coiled tubing when throwing the ball into the coiled tubing, which can ensure that the thrown ball can fall into the coiled tubing safely and accurately in one go.

[0019] The utility model can specifically design coiled tubing ball throwing auxiliary devices with different sizes according to different types of gas production trees, coiled tubing with different sizes, and different sizes of releasing balls, so as to be conveniently applied to the releasing tools of different downhole strings.

[0020] The coiled tubing ball throwing auxiliary device provided by the utility model has a simple structure, low cost, convenient processing and easy operation, and has a relatively broad popularization and application space. The coiled tubing ball throwing auxiliary device provided by the utility model has been successfully applied and achieved the expected effect. Description of the Drawings

[0021] Figure 1 is a schematic cross-sectional view of the coiled tubing ball throwing auxiliary device provided in Embodiment 1;

[0022] Figure 2 is a top view of the coiled tubing ball throwing auxiliary device provided in Embodiment 1;

[0023] Figure 3 is a bottom view of the coiled tubing ball throwing auxiliary device provided in Embodiment 1;

[0024] Figure 4 is a usage state diagram of the coiled tubing ball throwing auxiliary device provided in Embodiment 1.

[0025] Description of the Reference Numerals

[0026] 1. Upper tapered hole; 2. Straight hole; 3. Lower tapered hole; 4. Upper port; 5. Lower port; 6. Hanging seat; 7. Upper opening; 8. Lower opening; a. Coiled tubing ball throwing auxiliary device; b. Release ball; c. Gas production tree; d. Coiled tubing; e. Gap. Detailed Description of the Embodiments

[0027] The following detailed description of the specific embodiments of the utility model is provided with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the utility model, and are not intended to limit the utility model.

[0028] Embodiment 1

[0029] As Figures 1-3 shown, this embodiment provides a coiled tubing ball throwing auxiliary device a, which includes a straight pipe. Inside the straight pipe, an upper tapered hole 1, a straight hole 2, and a lower tapered hole 3 that are connected and coaxial are sequentially arranged from top to bottom; the diameter of the upper port 4 of the upper tapered hole 1 is greater than the diameter of the lower port 5 of the upper tapered hole 1, the diameter of the straight hole 2 is greater than the diameter of the lower port 5, the diameter of the upper opening 7 of the lower tapered hole 3 is the same as the diameter of the straight hole 2, and the diameter of the lower opening 8 of the lower tapered hole 3 is greater than the diameter of the upper opening 7.

[0030] A hanging seat 6 is formed at the top end of the straight hole 2, which is arranged around the lower port 5, and the plane where the hanging seat 6 is located is perpendicular to the side wall of the straight hole 2; the width of the hanging seat 6 is 6 mm; the outer diameter of the straight pipe is 120 mm; the diameter of the lower port 5 is 46 mm; the diameter of the lower opening 8 is 68 mm; the length of the straight pipe is 200 mm; the height of the upper tapered hole 1 is 50 mm; the height of the lower tapered hole 3 is 60 mm.

[0031] Combined with Figure 4 As shown, taking the KQ78 / 65 - 70 MPa gas production tree c and the 2 - inch coiled tubing d as an example, the coiled tubing ball - throwing auxiliary device a provided in this embodiment will be further described.

[0032] The inner diameter of the KQ78 / 65 - 70 MPa gas production tree c is 130 mm, the inner diameter of the 2 - inch coiled tubing d is 40 mm, and the outer diameter is 50.6 mm; the 2 - inch coiled tubing d is hung in the gas production tree c with an inner diameter of 130 mm. The unilateral annular space gap e between the coiled tubing d and the gas production tree c is 45 mm, and the diameter of the release ball b is 25 mm. It is very easy to directly throw the ball into the annular space gap e.

[0033] Through the auxiliary effect of the coiled tubing ball - throwing auxiliary device a provided in this embodiment, when throwing the ball into the coiled tubing d, the release ball b will not be thrown into the gap e between the gas production tree c and the coiled tubing d, and it can ensure that the ball can fall into the coiled tubing d at one time, safely and accurately.

[0034] When actually using the coiled tubing ball - throwing auxiliary device a provided in this embodiment, before throwing the ball, first put the coiled tubing ball - throwing auxiliary device a into the wellhead from the blow - down gate and seat it on the coiled tubing d, then throw the release ball b so that the release ball b falls into the coiled tubing d at one time, and finally start pumping the ball and applying pressure to release the downhole tool.

[0035] Embodiment 2

[0036] The structure of the coiled tubing ball - throwing auxiliary device a provided in this embodiment is basically the same as that in Embodiment 1. The difference is that in this embodiment, the width of the hanging seat 6 is 5 mm; the outer diameter of the straight pipe is 115 mm; the diameter of the lower port 5 is 46 mm; the diameter of the lower opening 8 is 55 mm; the length of the straight pipe is 180 mm; the height of the upper tapered hole 1 is 30 mm; the height of the lower tapered hole 3 is 50 mm.

[0037] Embodiment 3

[0038] This embodiment is basically the same as the coiled tubing ball injection aid a provided in Embodiment 1. The differences are that in this embodiment, the width of the hanging seat 6 is 7 mm; the outer diameter of the straight pipe is 125 mm; the diameter of the lower port 5 is 55 mm; the diameter of the lower opening 8 is 68 mm; the length of the straight pipe is 220 mm; the height of the upper tapered hole 1 is 30 mm; and the height of the lower tapered hole 3 is 70 mm.

[0039] Embodiment 4

[0040] This embodiment is basically the same as the coiled tubing ball injection aid a provided in Embodiment 1. The differences are that in this embodiment, the width of the hanging seat 6 is 6 mm; the outer diameter of the straight pipe is 120 mm; the diameter of the lower port 5 is 50 mm; the diameter of the lower opening 8 is 58 mm; the length of the straight pipe is 200 mm; the height of the upper tapered hole 1 is 30 mm; and the height of the lower tapered hole 3 is 65 mm.

[0041] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solutions of the present invention. To avoid unnecessary repetition, the present invention will not separately describe various possible combinations. But these simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. A coiled tubing ball throwing auxiliary device, characterized in that The coiled tubing ball injection aid (a) includes a straight pipe, and an upper tapered hole (1), a straight hole (2), and a lower tapered hole (3) which are interconnected and coaxial are sequentially arranged from top to bottom in the straight pipe; The diameter of the upper port (4) of the upper tapered hole (1) is larger than the diameter of the lower port (5) of the upper tapered hole (1), the diameter of the straight hole (2) is larger than the diameter of the lower port (5), the diameter of the upper opening (7) of the lower tapered hole (3) is the same as the diameter of the straight hole (2), and the diameter of the lower opening (8) of the lower tapered hole (3) is larger than the diameter of the upper opening (7).

2. The coiled tubing ball throwing auxiliary device according to claim 1, characterized in that A hanging seat (6) surrounding the lower port (5) is formed at the top end of the straight hole (2).

3. The coiled tubing ball throwing auxiliary device according to claim 2, wherein The plane where the hanging seat (6) is located is perpendicular to the side wall of the straight hole (2).

4. The coiled tubing ball throwing auxiliary device according to claim 3, characterized in that The width of the hanging seat (6) is 5-7 mm.

5. The coiled tubing ball injection auxiliary device according to any one of claims 1-4, characterized in that, The outer diameter of the straight pipe is 115-125 mm.

6. The coiled tubing ball throwing auxiliary device according to claim 5, wherein The diameter of the lower port (5) is 46-55 mm.

7. The coiled tubing ball injection auxiliary device according to claim 6, characterized in that, The diameter of the lower opening (8) is 55-68 mm.

8. The coiled tubing ball throwing auxiliary device according to claim 7, characterized in that The length of the straight pipe is 180-220 mm.

9. The coiled tubing ball injection aid according to claim 8, wherein, The height of the upper tapered hole (1) is greater than 25 mm.

10. The coiled tubing ball injection auxiliary device according to claim 9, wherein, The height of the lower tapered hole (3) is 50-70 mm.

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