Logging cable connection assembly

Abstract

A logging cable connecting assembly comprises a connecting cap, a tile sleeve and a pressing cap, an axial through inner cavity is formed in the connecting cap, an inner conical surface is arranged in a wiring end, and connecting inner threads and connecting outer threads are formed in the inner side wall and the outer side wall of the tail end of the cap respectively. The outer side of one end of the tile sleeve is an outer conical surface which corresponds to and is matched with the inner conical surface structure in the connecting cap, a stop groove with an end opening is formed in the outer conical surface area of the tile sleeve in the axial direction, and the outer side of the other end of the tile sleeve is a reducing outer cylindrical surface and is provided with a connecting outer thread which corresponds to and is connected with the connecting inner thread structure on the connecting cap in a matched mode; the logging cable connection assembly replaces a traditional three-taper-sleeve connection system, can simplify the operation procedure of cable mortise connection, reduces labor intensity, improves production efficiency, reduces accident risks, can be repeatedly disassembled, assembled and used in actual production, is beneficial to greatly reducing production investment and use and maintenance cost, and is suitable for popularization and application. The oil field production cost is obviously reduced and the oil field production benefits are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of well logging cable connection, in particular to a well logging cable connection assembly. Background Art

[0002] During downhole logging, if the logging instrument or cable becomes stuck and conventional methods cannot be used to free it, a core fishing process is typically used to free it. During the core fishing operation, the cable must be sequentially cut at the wellhead to facilitate the lowering of the drill pipe. This allows the cable connector to be used to repeatedly connect and disconnect the downhole cable with the winch cable. Currently, the connecting mechanisms at both ends of the cable connector, used to connect the downhole cable end and the winch cable end, are tri-cone sleeve connections. The utility model patent "Tri-cone Sleeve for Logging Cable," with authorization publication number CN205050616U, specifically discloses the specific structure and connection principle of the tri-cone sleeve connection mechanism. The inner conical surface of the outer sleeve of the tri-cone sleeve interacts with the outer conical surface of the middle sleeve to clamp the outer wire of the logging cable. The inner conical surface of the middle sleeve interacts with the outer conical surface of the inner sleeve to clamp the inner wire of the logging cable. The tri-cone sleeve connection mechanism is then rolled and embedded into the cable connector to secure the cable connector to the end of the logging cable. Although the use of a three-cone sleeve connection mechanism to connect the logging cable has the advantages of good connection firmness and high reliability, and will not damage the cable core of the logging cable, the protective outer sheath at the end of the logging cable must be stripped off during the connection process to completely expose the outer and inner steel wires of the logging cable. The cable core is then inserted into the inner hole of the inner sleeve, and the outer steel wire and the inner steel wire are respectively inserted in reverse between the outer sleeve and the middle sleeve of the three-cone sleeve connection mechanism and between the middle sleeve and the inner sleeve. Finally, the three-cone sleeve connection mechanism is rolled and embedded in the cable connection joint. The connection process is complicated and the entire process requires manual operation. The labor intensity is significantly higher and the connection efficiency is relatively low. The restrictive impact in actual production is becoming increasingly apparent. Therefore, it is necessary to study and improve the connection and fixing method between the logging cable and the cable connection joint to solve the existing technical problems. Utility Model Content

[0003] The purpose of the utility model is to provide a well cable connection assembly which can replace the traditional three-cone logging cable, simplify the connection method with the logging cable, reduce labor intensity and improve operation efficiency.

[0004] The cam is threaded with a threaded hole that is adapted to thread the cable into the well-traveled position, and the cam is threaded with a threaded hole that is adapted to thread the cable into the well-traveled position. The outer ring of the sleeve is provided with a circle, and the outer ring of the sleeve is provided with a circle, and the circle ...

[0005] The logging cable connection assembly also includes: an expansion cone sleeve, which is a circular cylinder with an outer conical sharp edge at one end. The inner hole diameter of the circular cylinder corresponds to the inner cable core diameter of the logging cable. When the pressure cap is tightened to connect the sleeve and lock the logging cable, the expansion cone sleeve is inserted into the connecting cap and inserted into the logging cable axially between the inner cable core and the outer steel wire layer of the end face of the logging cable, so that the inner cable core of the logging cable passes through the inner hole of the expansion cone sleeve, and at the same time, the outer steel wire layer and the outer protective skin of the logging cable are expanded, so that the outer diameter of the end of the logging cable expands and increases, and is tightened in the central axis hole of the sleeve, thereby enhancing the reliability of the fixed connection of the logging cable.

[0006] The logging cable connection assembly is preferably provided with a friction pad between the upper end surface of the connecting cap and the annular shoulder surface on the sleeve, so as to increase the friction resistance of the relative movement between the connecting cap and the sleeve, prevent the connecting cap from loosening from the sleeve in the working state, and improve the stability of the fixed connection between the connecting cap and the logging cable.

[0007] The logging cable connection assembly is preferably provided with spirally arranged inverted teeth on the inner circumferential surface of the central axis hole in the area where the sleeve and the cut-off groove are opened, so as to enhance the gripping force of the sleeve on the logging cable.

[0008] A cable anti-disconnect quick connector, consisting of a female connector and a male connector; the female connector includes: an upper die sleeve and the logging cable connection assembly, the upper die sleeve is connected and installed on the butt end of the female connector to be connected to the wellhead winch cable, and the logging cable connection assembly is connected and installed on the cable connection end of the female connector, an axially arranged hanging cavity and a locking pin hole are provided on the butt end face of the upper die sleeve, the hanging cavity is a variable diameter cylindrical cavity with a port diameter smaller than the inner cavity diameter, the axial length of the inner cavity is not less than the inner diameter of the inner cavity, and the circumferential surface of the upper die sleeve is provided with a hanging cavity and a locking pin hole. One side is provided with an introduction groove which is radially connected to the suspension cavity, the corresponding area of ​​the introduction groove and the inner cavity is a cylindrical groove, the cross-sectional circumferential diameter of the cylindrical groove is the same as the cross-sectional circumferential diameter of the inner cavity, the corresponding area of ​​the introduction groove and the port portion is a rectangular groove, the width of the rectangular groove is smaller than the cross-sectional circumferential diameter of the port portion; the male connector includes: a lower mold rod and the logging cable connection assembly, the lower mold rod is connected and installed at the docking end of the male connector, and the logging cable connection assembly is connected and installed at the cable connection end of the male connector for connecting with the downhole logging cable The lower die rod is connected to the lower die rod, and a coaxially arranged hanging rod is connected to the butt end face of the lower die rod. The diameter and length of the hanging rod body correspond to the opening diameter and setting length of the hanging cavity port portion respectively. The radially opposite sides of the rod body are respectively provided with mutually symmetrical and parallel column-notched planes along the axial direction. The spacing D between the column-notched planes corresponds to the width of the rectangular groove in the introduction groove. A hanging ball is coaxially arranged and fixedly connected to the end head of the hanging rod. The diameter of the hanging ball corresponds to the circumferential cross-sectional diameter of the inner cavity portion of the hanging cavity, so that the hanging rod can correspond to each other. The spatial orientation of the whole is guided from the guide groove into the hanging cavity. At the same time, a locking sleeve and a locking spring are axially limited and matched on the outer circumference of the butt end of the lower mold rod. A locking pin is fixedly installed on the front end surface of the locking sleeve. The specification structure and layout position of the locking pin correspond to the locking pin hole opened on the end surface of the upper mold sleeve. The locking spring applies an elastic force to the locking sleeve relative to the lower mold rod, pushing the locking sleeve toward the butt end of the lower mold rod in the limiting area, so that the locking pin remains protruding from the butt end surface of the lower mold rod.

[0009] The cable anti-detachment quick connector preferably has a hemispherical transition surface where the inner cavity of the hanging cavity and the port portion of the hanging cavity are connected in a variable diameter manner. The diameter of the hemispherical surface is the same as the circumferential cross-sectional diameter of the inner cavity of the hanging cavity, and can establish good fitting adaptability with the hanging ball accommodated in the inner cavity of the hanging cavity, thereby maintaining the stability of the mutually fitting connection.

[0010] The beneficial effect of the present invention is to provide a logging cable connection assembly, which replaces the traditional three-cone sleeve connection system with a sleeve connection system in which a pressure cap and a sleeve cooperate, thereby overcoming the disadvantages of high labor intensity and low operating efficiency of the cable mortise connection in the prior art. When applied to actual production, it can not only simplify the operating procedures, reduce labor intensity, and improve production efficiency, but also significantly shorten the operating time of operators in the wellhead area, reduce the risk of production accidents, and ensure the personal safety of workers. In particular, the sleeve connection system can be repeatedly disassembled and reused in production, and also has the advantages of simple structure, convenient disassembly and assembly, good versatility, and easy maintenance, which is conducive to significantly reducing production investment and maintenance costs, significantly reducing oil field production costs, and improving oil field production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a cross-sectional view of the logging cable connection assembly structure.

[0012] Figure 2 for Figure 1 A partial enlarged view of point Ⅰ in the middle.

[0013] Figure 3 Schematic diagram of the logging cable connection assembly for securing the logging cable.

[0014] Figure 4 for Figure 3 Cross-sectional view of the middle AA section.

[0015] Figure 5 This is the structural diagram of the cable anti-disconnection quick connector used in the logging cable connection assembly.

[0016] Figure 6 for Figure 5 Cross-sectional view of the middle BB section.

[0017] Among them: 1 is the connecting cap, 2 is the tile sleeve, 3 is the pressure cap, 4 is the expansion cone sleeve, 5 is the friction pad, 6 is the upper die sleeve, 7 is the lower die rod, 8 is the connecting sleeve, 9 is the locking sleeve, 10 is the logging cable, 11 is the locking spring, 12 is the locking pin, 13 is the inverted tooth teeth, 14 is the cylindrical groove, 15 is the rectangular groove, 16 is the hanging rod, 17 is the hanging ball, 18 is the inner cable core, 19 is the outer steel wire layer, and 20 is the logging cable connection assembly. DETAILED DESCRIPTION

[0018] Furthermore, taking the application of a well logging cable connection assembly as an example, the technical solution for which protection is requested in the present utility model is described in detail.

[0019] A cable anti-drop quick connector, such as Figure 5 and Figure 6As shown, the logging cable connection assembly 20, the upper die sleeve 6, the lower die rod 7, the connecting sleeve 8, the locking sleeve 9 and the locking spring 11 are composed. Further, the logging cable connection assembly 20, as shown Figures 1 to 4 As shown, it is specifically composed of a connecting cap 1, a bushing 2, a pressure cap 3 and an expansion cone sleeve 4. The wiring terminal of the connecting cap 1 is provided with an inner conical surface, and the inner and outer side walls of the connecting end are respectively provided with connecting internal threads and connecting external threads with opposite rotation directions. The inner side of the bushing 2 is provided with a connected central axis hole, and the outer side of one end is in the shape of an outer conical surface. The outer conical surface corresponds to and cooperates with the inner conical surface structure provided in the connecting cap 1. Four end openings are provided on the outer conical surface area and are arranged along the axial direction. Spirally arranged inverted teeth 13 are provided on the inner circumferential surface of the central axis hole in the area where the cut-off groove is provided, and the outer side of the other end is an outer cylindrical surface with a reduced diameter. The outer conical surface is used for expanding the outer diameter of the logging cable 10 by embedding the expansion cone 4 between the inner cable core 18 and the outer steel wire layer 19 of the logging cable 10, so that the logging cable 10 is tightened in the central axis hole of the logging sleeve 2, thereby providing reliable protection for the connection and fixation of the logging cable 10.

[0020] like Figure 5 and Figure 6As shown, the upper die sleeve 6, the connecting sleeve 8 and a group of the logging cable connection assemblies 20 are threadedly connected in sequence to form a female joint. A hanging cavity axially arranged along the central axis and two locking pin holes radially symmetrically arranged on the end face of the butt joint of the upper die sleeve 6 are provided. The hanging cavity is a variable diameter cylindrical cavity with a diameter of the port portion smaller than that of the inner cavity portion. The axial length of the inner cavity portion of the hanging cavity is greater than the inner diameter of the inner cavity portion. The transition surface connected to the variable diameter of the hanging cavity port portion is a hemispherical surface. The straight line of the hemispherical surface is smaller than that of the inner cavity portion. The diameter is the same as the circumferential cross-sectional diameter of the inner cavity of the suspension cavity, and an introduction groove is provided on one side of the circumferential surface of the upper mold sleeve 6, and the corresponding area of ​​the introduction groove and the inner cavity is a cylindrical groove 14, and the cross-sectional circumferential diameter of the cylindrical groove 14 is the same as the cross-sectional circumferential diameter of the inner cavity, and the corresponding area with the port portion is a rectangular groove 15, and the width of the rectangular groove 15 is smaller than the cross-sectional circumferential diameter of the port portion of the suspension cavity; the lower mold rod 7 and another group of the logging cable connection assembly 20 are threadedly connected to form a male joint, and a suspension rod 16 is connected to the butt end face of the lower mold rod 7, and the diameter and length of the suspension rod 16 rod body are respectively the same as the opening diameter and setting length of the suspension cavity port portion, and symmetrical and parallel column notch planes are provided on both sides of the rod body in the radial direction, and the spacing D between the column notch planes is the same as the width of the rectangular groove 15, and a hanging ball 17 is further fixedly connected to the end head of the hanging rod 16, and the diameter of the hanging ball 17 is the same as the diameter of the inner cavity of the suspension cavity The circumferential cross-sectional diameters of the parts correspond to each other, and the locking sleeve 9 and the locking spring 11 are axially limited and fitted on the outer circumference of the butt end of the lower die rod 7. Two locking pins 12 are fixedly mounted on the front end surface of the locking sleeve 9, and the locking pins 12 respectively correspond to the locking pin holes opened on the upper die sleeve 6. The locking spring 11 elastically pushes the locking sleeve 9 toward the connecting end of the lower die rod 7 relative to the lower die rod 7, so that the locking pin 12 remains protruding from the butt end surface of the lower die rod 7.

[0021] The cable anti-drop quick connector described in this embodiment is used for core fishing operations. The specific operation method is as follows: before the drilling tool for fishing is lowered into the well, a set of logging cable connection assemblies 20 are first connected to the end of the winch cable on the well head, and then the connection cap 1 in the logging cable connection assembly 20 is threadedly connected and installed with the connection sleeve 8 and the upper mold sleeve 6 in sequence to complete the connection and installation of the female joint; then the drilling tool is sent downhole for fishing operations, and when the fishing device captures the downhole instrument and lifts the drilling tool and lifts the drill pipe as a whole to the ground, a T-type clamp is used to clamp the well head. The drilling tool is disassembled and separated from the drill pipe of the well, and the downhole cable is cut off and the downhole cable in the drill pipe is reversely pulled out from the water hole. Then, a set of logging cable connection assemblies 20 are taken and quickly connected to the end of the downhole cable. After confirming that the downhole cable and the logging cable connection assembly 20 are firmly connected, the lower mold rod 7 is threadedly connected to the connection cap 1 in the logging cable connection assembly 20 to complete the connection and installation of the male connector; after that, the female connector connected to the winch cable is matched with the male connector connected to the downhole cable, as shown in FIG. Figure 5 As shown, the specific steps are: pull the locking sleeve 9 back to the cable connection end of the male connector in advance, so that the locking pin 12 on the locking sleeve 9 is recovered to the cross section of the lower mold rod 7, and at the same time, the hanging rod 16 on the male connector is embedded into the guide groove opened on the female connector from the side, until the hanging rod 16 and the hanging ball 17 connected thereto are respectively fitted and embedded in the port portion or inner cavity portion of the hanging cavity opened on the upper mold sleeve 6, and then the female connector is rotated 90 degrees relative to the male connector, and the female connector and the male connector are locked by utilizing the structural cooperation between the hanging rod 16 and the port portion of the hanging cavity. The head is axially connected, and then the locking sleeve 9 is released and the circumferential orientation is adjusted appropriately, so that the locking pin 12 can be embedded in the locking pin hole opened on the upper die sleeve 6 under the action of the locking spring 11, limiting the rotation of the female connector relative to the male connector, and locking the mutual connection rotation between the two; then the clamping fixation of the downhole cable by the T-type clip is released, and the drilling tool is lifted up again until the next column rotating rod is lifted to the ground as a whole, and the above-mentioned operation steps are repeated, and this reciprocating process is repeated until the drilling tool and the downhole instrument are salvaged out of the well, thereby completing the through-hole salvage operation of the downhole instrument.

[0022] Among them, the method of connecting the logging cable connection assembly 20 with the logging cable 10 is: first, pass the logging cable 10 through the cable hole at the top of the connecting cap 1, and then sequentially put the tile sleeve 2, friction pad 5 and pressure cap 3 on the logging cable 10 from the end of the logging cable 10 at the top of the connecting cap 1, then push the tile sleeve 2 into and embed it in the inner cavity of the connecting cap 1, push the friction pad 5 into the inner cavity of the connecting cap 1 along with the tile sleeve 2, and thread the pressure cap 3 into the inner cavity of the connecting cap 1, and fully screw in the connecting cap 1 so that the connecting cap 1 and the tile sleeve 2 cooperate to clamp the friction pad 5 and at the same time push the tile sleeve 2 forward. Figure 3 and Figure 4 As shown, the outer conical surface area of ​​the sleeve 2 produces radial elastic contraction deformation under the action of the inner conical surface on the connecting cap 1, thereby connecting and locking the logging cable 10, and then the end of the logging cable 10 is aligned with the tail end section of the sleeve 2 and cut off, and the expansion cone sleeve 4 is impact-embedded into the logging cable 10 on the end section using a matching special tool, so that the logging cable 10 is tightened in the central axis hole of the sleeve 2; it is obvious that the logging cable connection assembly 20 can be used with the male connector and the female connector at the same time, has good adaptability and versatility, and does not have any disposable loss parts in the composition structure, and can be reused as a whole in actual production, that is, the logging cable connection assembly 20 can be directly reused after being disassembled from the cut logging cable 10, effectively reducing the maintenance cost expenditure of production raw material consumption. Compared with the existing technology, it can not only simplify the operating procedures, reduce labor intensity, and improve production efficiency, but also reduce production cost investment, reduce the risk of production accidents, and improve oil field production efficiency.

Claims

1. A logging cable connection assembly, characterized in that: include: A connecting cap (1), a sleeve (2) and a pressing cap (3); the connecting cap (1) has an axially through inner cavity, the top of the cap is a wiring terminal, a cable hole is provided on the end, an inner conical surface is provided inside, the tail end of the cap is a connecting end, and a connecting internal thread and a connecting external thread are provided on the inner and outer side walls respectively, and the thread rotation directions of the connecting internal thread and the connecting external thread provided on the connecting cap (1) are opposite to each other; the sleeve (2) and the pressing cap (3) are both circular cylinders, the sleeve (2) has a central axis hole, and the outer side of one end is an outer conical surface, the outer conical surface corresponds to and cooperates with the inner conical surface structure provided in the connecting cap (1), so that the sleeve (2) can be embedded in the inner cavity of the wiring terminal of the connecting cap (1), and at the same time, in the A cut-off groove with an axially arranged end opening is provided in the outer conical surface area of ​​the sleeve (2), and the cut-off grooves are evenly distributed on the circumferential section of the sleeve (2). The outer side of the other end is an outer cylindrical surface with a smaller diameter than the outer conical surface, and an annular shoulder surface is formed between the outer cylindrical surface and the outer conical surface. The inner hole diameter of the pressure cap (3) is larger than the diameter of the outer cylindrical surface area of ​​the sleeve (2), and a connecting external thread is provided on the outer side. The connecting external thread provided on the pressure cap (3) corresponds to and is connected with the connecting internal thread structure provided on the connecting cap (1). Fully screwing the connecting cap (1) can make the upper end face fit against the annular shoulder surface on the sleeve (2) and push the sleeve (2) forward relative to the connecting cap (1).

2. A logging cable connection assembly as claimed in claim 1, characterized in that: Also includes: The expansion cone sleeve (4) is a circular cylinder with an outer conical edge provided at one end, and the inner hole diameter of the circular cylinder corresponds to the diameter of the inner cable core (18) of the logging cable (10).

3. A logging cable connection assembly according to claim 1 or 2, characterized in that: A friction pad (5) is provided between the upper end surface of the connecting cap (1) and the annular shoulder surface on the bushing sleeve (2).

4. A logging cable connection assembly according to claim 3, characterized in that: Spirally arranged inverted teeth (13) are provided on the inner circumferential surface of the central axis hole in the region where the cut-off groove is opened on the bushing (2).

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