Heavy-duty wireline cap for oil and gas well logging

Abstract

The utility model discloses a heavy steel cable rope cap for oil and gas well logging, including the rope cap body, the rope cap body outer wall one end is provided with the fishing diameter, the fishing diameter end is provided with the top step, the rope cap body one end inside is provided with the steel cable, the rope cap body inner wall is provided with the rope cap head, the rope cap head includes two cone sleeves, the length of fishing diameter is 100mm. The utility model discloses through the mutual cooperation between the rope cap body, the rope cap head and fishing diameter, increases the fishing diameter length to 100mm, even if the fishing diameter top step is pulled in the plane, still can continue using the special polished rod fishing barrel to continue fishing, avoids the downhole tool falling well accident, adopts two single layer cone sleeve rope cap head structure simultaneously, and its locking force increases with the increasing of steel cable tension, guarantees the stability between steel cable and rope cap body, and is convenient and fast to install, saves time and effort.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas well logging equipment technology, specifically a heavy-duty steel cable cap for oil and gas well logging. Background Technology

[0002] Traditional logging line caps have a retrieval diameter of only 50mm. During the retrieval process, once the top step of the retrieval diameter is flattened and the special retrieval tube is lost, the remaining retrieval diameter is too short (50mm), which is less than the length of the polished rod retrieval tube, making it impossible to retrieve the tool again using the polished rod retrieval tube, resulting in a downhole tool falling into the well.

[0003] Traditional logging rope caps typically consist of an inner cone sleeve and an outer cone sleeve, with the outermost two layers of steel wire sandwiched between the inner and outer cone sleeves to secure the rope.

[0004] In oil and gas well heavy steel cable retrieval operations, the lifting load is more than 8 times that of logging operations. Using traditional rope caps cannot meet the tension requirements, which can easily cause the rope caps to slip off and tools to fall into the well.

[0005] In addition, during installation, the outermost two layers of the entire steel cable need to be stripped and evenly distributed inside the inner and outer cone sleeves, which is time-consuming and labor-intensive.

[0006] Therefore, we propose to design a heavy-duty steel cable cap for oil and gas well logging. Utility Model Content

[0007] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0008] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: A heavy steel cable cap for logging oil and gas wells includes a cap body, one end of the outer wall of the cap body is provided with a retrieval diameter, the length of the retrieval diameter is 100mm, the end of the retrieval diameter is provided with a top step, and a steel cable is inserted through one end of the cap body. The inner wall of the rope cap is provided with a rope cap head, which includes two conical sleeves.

[0009] As a preferred embodiment of the heavy-duty steel cable cap for oil and gas well logging described in this utility model, the inner diameter of the two conical sleeves is smaller than the outer diameter of the steel cable, which facilitates the application of downward pressure to the outer wall of the steel cable and improves friction.

[0010] As a preferred embodiment of the heavy-duty steel cable cap for oil and gas well logging described in this utility model, the inner wall of the cap is tapered near the cap head, and the outer walls of the two tapered sleeves are in contact with the tapered surface of the inner wall of the cap, so that the greater the tension, the greater the force exerted by the cap head on the steel cable.

[0011] As a preferred embodiment of the heavy-duty steel cable cap for oil and gas well logging described in this utility model, both inner walls of the two conical sleeves are threaded, and the inner walls of the conical sleeves are in contact with the outer wall of the steel cable, which facilitates the improvement of the friction between them and the steel cable.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This invention increases the length of the retrieval diameter to 100mm by coordinating the rope cap body, rope cap head, and retrieval diameter. Even if the top step of the retrieval diameter is flattened, a dedicated clean rod retrieval cylinder can still be used for retrieval, avoiding accidents where downhole tools fall into the well. At the same time, the two-lobed single-layer conical sleeve rope cap head structure increases the locking force as the tension of the steel cable increases, ensuring the stability between the steel cable and the rope cap body. It is also convenient and quick to install, saving time and effort. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a schematic diagram of the appearance of a heavy-duty steel cable cap for oil and gas well logging according to this utility model; Figure 2 This is a schematic diagram of the structure of a heavy-duty steel cable cap for oil and gas well logging according to this utility model; Figure 3 This is a schematic diagram of the cap head of a heavy-duty steel cable cap for oil and gas well logging according to this utility model.

[0014] Legend: 1. Rope cap body; 2. Salvage diameter; 3. Top step; 4. Steel cable; 5. Rope cap head; 501. Conical sleeve; 6. Thread. Detailed Implementation

[0015] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0016] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0017] Please see Figure 1-3 This utility model provides a heavy-duty steel cable cap for oil and gas well logging, including a cap body 1, with a retrieval diameter 2 provided at one end of the outer wall of the cap body 1. The length of the retrieval diameter 2 is 100mm, which is an extension of the original retrieval diameter 2 to 100mm.

[0018] The end of the salvage channel 2 is provided with a top step 3, and a steel cable 4 is installed inside one end of the rope cap body 1.

[0019] The inner wall of the rope cap body 1 is provided with a rope cap head 5, which includes two conical sleeves 501. The inner diameter of the two conical sleeves 501 is smaller than the outer diameter of the steel cable 4, which facilitates the application of downward pressure to the outer wall of the steel cable 4 and improves the friction.

[0020] In this embodiment, the inner wall of the rope cap body 1 is tapered near the rope cap head 5, and the outer walls of the two tapered sleeves 501 are in contact with the tapered surface of the inner wall of the rope cap body 1, so that the greater the tension, the greater the force exerted by the rope cap head 5 on the steel cable 4.

[0021] In this embodiment, the inner walls of both tapered sleeves 501 are provided with threads 6, and the inner walls of the tapered sleeves 501 are in contact with the outer walls of the steel cable 4, which facilitates the increase of friction between them.

[0022] Based on the existing rope cap body 1, this application improves the retrieval diameter 2 by increasing its length to 100mm. If the top step 3 of the retrieval diameter 2 is flattened during the retrieval process, a dedicated bare rod retrieval cylinder can still be used to continue the retrieval.

[0023] Meanwhile, the rope cap head 5 is improved. In order to ensure the strength of the rope cap head 5 during the retrieval operation of the heavy steel cable 4, the rope cap head 5 adopts a two-lobed single-layer conical sleeve 501 structure. The inner diameter of the conical sleeve 501 is smaller than the outer diameter of the steel cable 4. The two-lobed conical sleeve 501 is placed on the outer surface of the steel cable 4 and sent into the rope cap body 1. The outer conical surface of the conical sleeve 501 contacts the inner conical surface of the rope cap body 1. The greater the tension, the greater the locking force applied by the rope cap head 5 to the steel cable 4. The inner hole surface of the rope cap head 5 is also provided with threads 6 to increase the friction with the surface of the steel cable 4.

[0024] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A heavy-duty steel cable cap for oil and gas well logging, comprising a cap body (1), characterized in that, The outer wall of the rope cap body (1) is provided with a retrieval channel (2) at one end. The length of the retrieval channel (2) is 100mm. The end of the retrieval channel (2) is provided with a top step (3). A steel cable (4) is installed inside one end of the rope cap body (1). The inner wall of the rope cap body (1) is provided with a rope cap head (5), and the rope cap head (5) includes two conical sleeves (501).

2. The heavy-duty steel cable cap for oil and gas well logging according to claim 1, characterized in that, The inner diameter of the two tapered sleeves (501) is smaller than the outer diameter of the steel cable (4).

3. The heavy-duty steel cable cap for oil and gas well logging according to claim 1, characterized in that, The inner wall of the rope cap body (1) is conical near the rope cap head (5), and the outer walls of the two conical sleeves (501) are in contact with the conical surface of the inner wall of the rope cap body (1).

4. The heavy-duty steel cable cap for oil and gas well logging according to claim 1, characterized in that, Both of the conical sleeves (501) have threads (6) on their inner walls, and the inner walls of the conical sleeves (501) are in contact with the outer walls of the steel cable (4).

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