Semi-open type cylinder fish finding and collecting device

Abstract

The utility model relates to a kind of semi-open cylinder fish finding and collecting device, belong to the technical field of fish finding and collecting in well operation, including connecting head, introduction centralizer section and half-split guide section, connecting head is sequentially connected with introduction centralizer section, half-split guide section.This application develops semi-open cylinder fish finding and collecting device, after failure of casing milling management, the device is used to carry out fish finding and collecting construction to casing broken well, the device uses the characteristics of semi-open cylinder, rotates the fish finding pipe column with open pipe, and the fish top is collected into open pipe, the fish top is trimmed in fish finding pipe column, by replacing damaged casing, completely eliminate casing broken well safety environmental protection hidden danger, protect normal water injection development in block.

Description

Technical Field

[0001] This invention belongs to the field of fish finding and retrieval technology in downhole operations, specifically relating to a semi-open cylindrical fish finding and retrieval device. Background Technology

[0002] During oilfield development, some wells experience casing misalignment due to water absorption and expansion of formation mudstone. For wells with large casing misalignment diameters and small displacement of the casing top, casing milling and replacement techniques can be used. However, in wells with severe misalignment and large displacement of the lower casing top, locating the casing top is extremely difficult. Conventional tubing cannot reach the lower wellbore, making casing repair impossible. During well sealing, cement slurry cannot be injected into the lower wellbore and oil layer, hindering effective sealing. To prevent environmental incidents caused by formation energy accumulation leading to casing return, these wells urgently require remediation. Existing commonly used milling tools, such as... Figure 4 As shown, if there is a certain displacement between the milling tool and the lower sleeve, that is, the milling tool is pressed on the upper part of the lower sleeve fish top, the weight of the milling column acts on the lower sleeve fish top, squeezing the lower sleeve fish top to bend, causing the lower sleeve fish top to move outward, increasing the loss displacement of the fish top, and increasing the difficulty of treatment. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a semi-open cylindrical fish-finding and catching device, comprising a connector, an introduction and straightening section, and a semi-slit guide section, wherein the connector is sequentially connected to the introduction and straightening section and the semi-slit guide section.

[0004] Furthermore, the other end of the connector is detachably connected to the milling sleeve.

[0005] Furthermore, both the connector and the milling sleeve are hollow tubular columns, and the connector is connected to the inside of the milling sleeve.

[0006] Furthermore, the introduced straightening section is a hollow tubular column with a left-handed spiral guide notch.

[0007] Furthermore, the edge of the left-hand spiral guide notch is chamfered.

[0008] Furthermore, the introduced straightening section is connected to the inside of the sleeve milling cylinder.

[0009] Furthermore, the semi-sectioned guide section is a semi-hollow tubular column formed by half-sectioning a cylinder.

[0010] Furthermore, the semi-section guide section is connected to the inside of the milling sleeve.

[0011] Furthermore, a left-handed helical guide wire is provided on the half-section guide section.

[0012] Furthermore, the edge portion of the left-hand spiral guide wire is chamfered.

[0013] The beneficial effects of this invention are as follows: This invention develops a semi-open cylindrical fish-finding and fish-collecting device. After the failure of casing milling treatment, this device is used to carry out fish-finding and fish-collecting operations on casing misalignment wells. This device utilizes the characteristics of a semi-open cylindrical tube, rotates the fish-finding string with an open tube, and collects the fish head into the open tube. The fish head is repaired inside the fish-finding string. By replacing the damaged casing, the safety and environmental hazards of casing misalignment wells are completely eliminated, ensuring the normal water injection development of the block.

[0014] Extensive field trials yielded a near 100% success rate. Verification and practical operation of the semi-open circular pipe fish-finding tool confirmed its crucial role in fish retrieval and recovery operations in wells with severe casing misalignment, meeting current needs for well remediation. Using this tool expands the fish-finding and recovery area, increasing the success rate of remediation for wells with severe casing misalignment. After successful fish retrieval, the top of the fish is corrected within the casing milling cylinder before the tubing string is lowered and straightened, ensuring smooth subsequent operations. Wells that have been successfully treated have resumed normal production, completely eliminating safety and environmental hazards associated with casing misalignment wells and ensuring normal water injection development in the block. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the semi-open cylindrical fish-finding and fish-collecting device of the present invention.

[0016] Figure 2 This is a schematic diagram of the semi-open cylindrical fish-finding and fish-collecting device of the present invention.

[0017] Figure 3 This is a flowchart of the semi-open cylindrical fish-finding and fish-collecting process of the present invention.

[0018] Figure 4 A schematic diagram illustrating the milling operation using existing milling tools for casing misalignment wells;

[0019] Figure 5 A schematic diagram illustrating the milling operation using the device of this invention for wells with misaligned casing.

[0020] 1-Connecting thread, 2-Introducing and straightening section, 3-Half-section guide section, 4-Left-hand spiral guide notch, 5-Left-hand spiral guide line. Detailed Implementation

[0021] Example 1

[0022] To make the technical means and objectives of this invention easier to understand, the invention is further described below in conjunction with specific embodiments, such as a semi-open cylindrical fish-finding and fish-collecting device. Figures 1-2 As shown, it includes a connector 1, an introduction and straightening section 2, and a half-section guide section 3, with the connector 1 connected in sequence to the introduction and straightening section 2 and the half-section guide section 3.

[0023] The other end of the connector 1 is detachably connected to the milling sleeve.

[0024] The connector 1 and the milling sleeve are both hollow tubular columns, and the connector 1 is connected to the inside of the milling sleeve.

[0025] The introduced straightening section 2 is a hollow tubular column with a left-handed spiral guide notch 4.

[0026] The edge of the left-hand spiral guide notch 4 is chamfered and ground.

[0027] The straightening section 2 is connected to the inside of the milling sleeve.

[0028] The semi-section guide section 3 is a semi-hollow tubular column formed by half-sectioning a cylinder.

[0029] The semi-section guide section 3 is connected to the inside of the milling sleeve.

[0030] The semi-section guide section 3 is provided with a left-handed helical guide line 5.

[0031] The edge of the left-hand spiral guide wire 5 is chamfered and ground.

[0032] Example 2

[0033] To address the problem that commonly used milling tools cause the top of the casing fish to shift outward during milling operations, increasing the difficulty of remediation, a semi-open cylindrical method for locating and recovering the fish is established to improve the success rate of remediation of casing misalignment wells.

[0034] In the process of treating casing misalignment wells, problems such as large casing misalignment displacement and difficulty in locating fish (the part of the casing to be repaired) prevent conventional tubing from finding the lower wellbore, making casing repair and fish removal impossible. Furthermore, during well sealing, cement slurry cannot be injected into the lower wellbore and oil layer, hindering effective well sealing and posing safety and environmental hazards. This paper proposes a semi-open cylindrical method for locating and recovering fish to improve the success rate of casing misalignment well treatment.

[0035] (1) Design method of semi-open cylinder

[0036] like Figure 3 As shown, to address the problems of large casing misalignment and difficulty in locating fish, a semi-open fish retrieval and retrieval tool was manufactured. The tool was connected to the milling string and lowered above the fish. By rotating the milling string, the bottom tool began to rotate. Due to the semi-open structure at the front end of the tool, it avoided the fish top of the lower casing during rotation, allowing the semi-open cylindrical fish retrieval and retrieval tool to directly contact the casing below the fish top and retract the casing, thus achieving the purpose of locating and retrieving the fish. A lead mold was printed inside the milling cylinder to confirm whether the fish top was successfully retrieved and the condition of the fish top. The milling tool was then lowered to repair the fish top, providing an entry channel for the next major overhaul operation.

[0037] 1) Tool shape design:

[0038] A 2m long cylinder with an outer diameter of 273mm and an inner diameter of 259mm is cut into a semi-circular shape at its front end, creating a semi-open cylindrical fish-finding and retrieval tool (273*259*2000). Its structure consists of three parts: a connecting thread 1, an introduction and straightening section 2, and a semi-sectioned guide section 3. The connecting thread 1 connects the guide shoe to the milling sleeve. The semi-sectioned guide section 3 is formed by cutting the cylinder in half, with a left-hand spiral guide line 5 at the lower end, and all edges are chamfered. The introduction and straightening section 2 is a complete cylinder with an inner diameter 2-3mm larger than the diameter of the fish, and a conical surface transitioning to the inner cavity of the semi-sectioned guide section 3; a left-hand spiral guide notch 4 is opened at the end, and its edges are chamfered.

[0039] 2) Working principle:

[0040] like Figure 5 As shown, when the casing breaks and the fish head of the lower casing is biased against the well wall or the large belly part, the semi-open cylindrical fish finding and retrieval tool has a semi-open structure at the front end, which plays a role in avoiding the fish head of the lower casing during rotation. The semi-cut guide section 3 can be inserted between the well wall and the fish head along the well wall and guide the fish head into the straightening section 2, so that the fish head is centered and correctly guided into the casing milling cylinder.

[0041] (2) Operating method of semi-open cylindrical fish catching and finding tool

[0042] 1) Connect the semi-open cylindrical fish retrieval and locating tool to the milling sleeve and lower it into the well along with the milling sleeve.

[0043] 2) When you are 1-2 meters away from the top of the fish, turn on the pump to flush the top of the fish.

[0044] 3) Slowly rotate clockwise while slowly lowering the object.

[0045] 4) When the suspended weight decreases or the lowering is obstructed, print a lead mold inside the milling sleeve to determine the fish retrieval status.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A semi-open cylindrical fish-finding and fish-collecting device, characterized in that, It includes a connector (1), an introduction and straightening section (2), and a half-section guide section (3), with the connector (1) connected to the introduction and straightening section (2) and the half-section guide section (3) in sequence.

2. The semi-open cylindrical fish-finding and fish-collecting device as described in claim 1, characterized in that, The other end of the connector (1) is detachably connected to the milling sleeve.

3. The semi-open cylindrical fish-finding and fish-collecting device as described in claim 2, characterized in that, Both the connector (1) and the milling sleeve are hollow tubular columns, and the connector (1) is connected to the inside of the milling sleeve.

4. The semi-open cylindrical fish-finding and fish-collecting device as described in claim 3, characterized in that, The introduced straightening section (2) is a hollow tubular column with a left-handed spiral guide notch (4).

5. The semi-open cylindrical fish-finding and fish-collecting device as described in claim 4, characterized in that, The edge of the left-hand spiral guide notch (4) is ground and chamfered.

6. The semi-open cylindrical fish-finding and fish-collecting device as described in claim 4, characterized in that, The introduced straightening section (2) is connected to the inside of the sleeve milling cylinder.

7. The semi-open cylindrical fish-finding and fish-collecting device as described in claim 6, characterized in that, The semi-section guide section (3) is a semi-hollow tube column formed by half-sectioning a cylinder.

8. The semi-open cylindrical fish-finding and fish-collecting device as described in claim 7, characterized in that, The semi-section guide section (3) is connected to the inside of the sleeve milling cylinder.

9. The semi-open cylindrical fish-finding and fish-collecting device as described in claim 8, characterized in that, A left-handed spiral guide line (5) is provided on the half-section guide section (3).

10. The semi-open cylindrical fish-finding and fish-collecting device as described in claim 9, characterized in that, The edges of the left-hand spiral guide wire (5) are ground and chamfered.

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