Device and method for re-threading and salvaging fallen-well cable

Abstract

A device and method for re-threading a cable in a well for salvage, wherein a salvage tube is provided at the lower end of a first drilling tool, the median vertical line of the first drilling tool and the median vertical line of the salvage tube are the same straight line, and a self-locking salvage hook is provided between the first drilling tool and the inside of the salvage tube. The present invention adopts a method of lowering the self-locking salvage hook through the inside of the first drilling tool to the bottom of the salvage tube, under the action of a spring, the telescopic outer cylinder is compressed, the bottom of the telescopic outer cylinder contacts the bottom of the salvage, and after the salvage hook salvages the cable in the well, the cable in the well is pulled up through the second drilling tool, the telescopic outer cylinder is stretched, the cable in the well is salvaged through the inside of the first drilling tool, the cable in the well is pulled until it reaches a certain tension, the head of the cable in the well is connected to a quick connector at the wellhead, and the cable in the well is salvaged by the core-threading salvage method, which can quickly salvage the cable in the well and the stuck tools, reduce the number of drilling trips and the workload, shorten the construction period, improve the salvage efficiency, and effectively avoid the wear of the well wall or casing caused by excessive drilling and long-term operation.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling, and in particular relates to a device and method for re-threading and salvaging a cable dropped into a well. Background Art

[0002] Due to the large well inclination, cable weight or excessive inner diameter of the perforating gun body, the original artificial cable weakness fails, resulting in the cable carrying or delivery tool getting stuck and the cable breaking and falling into the well. The cable salvage operation workload is greatly increased, the number of trips and drillings is large, the construction time is long, and even the long salvage operation cycle causes serious wear on the well casing wall.

[0003] After the cable operation falls into the well, salvaging the cable is a major difficulty in the logging industry. The predecessors in the industry have tried all kinds of ways to solve this problem, to improve the shape of the tool, and use external hooks, internal and external combined hooks, internal hooks and other tools for salvage. The original core-through salvage process is to use a special cable T-type card to clamp the cable at the wellhead when the cable is carrying or delivering the downhole tool. The cable is not broken. After pulling the cable to a suitable tension, the cable is cut off with a cable-specific T-type card. After the lower part is connected to the quick connector, the lower cable head is placed at the wellhead, the upper part of the cut cable is added with a weight rod, and then when adding a single cable, the cable is inserted into the salvage tool and the drilling tool using a quick connector to achieve the purpose of salvaging the stuck tool in the well. This is called "core-through salvage", but this process cannot be used once the cable is broken and falls into the well. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a device and method for re-threading and salvaging a cable fallen into a well, which can quickly salvage the cable fallen into the well and avoid wear and damage to the well wall or casing caused by excessive drilling and lowering.

[0005] The technical solution adopted to solve the above technical problems is: a salvage tube is arranged at the lower end of the first drilling tool, the mid-vertical line of the first drilling tool and the mid-vertical line of the salvage tube are the same straight line, and a self-locking hook is arranged in the middle of the first drilling tool and the inside of the salvage tube.

[0006] The self-locking fishing hook of the present invention is as follows: the lower end of the second drilling tool is connected to the telescopic outer tube through a connecting head, a spring is arranged inside the telescopic outer tube, the upper end of the spring is connected to the connecting head, and the lower end is connected to the inside of the telescopic outer tube, and a fishing hook is arranged at the lower end of the connecting head inside the telescopic outer tube.

[0007] The telescopic outer cylinder of the present invention is a cylindrical cylinder, and the inner diameter of the telescopic outer cylinder is 55-75 mm.

[0008] The angle α between the plane where the bottom surface of the telescopic outer cylinder of the present invention is located and the plane where the horizontal plane is located is 35° to 40°.

[0009] The method of using the above-mentioned cable re-threading and salvaging device comprises the following steps:

[0010] (1) Place the first drilling tool and the overshot tube into the well and lower them to the head position of the downhole cable;

[0011] (2) lowering the self-locking fishing hook through the first drilling tool to the bottom of the overshot tube. Under the action of the spring, the telescopic outer tube is compressed, the bottom of the telescopic outer tube contacts the bottom of the overshot tube, and the fishing hook extends from the bottom of the overshot tube to salvage the downhole cable. After salvaging, the downhole cable is pulled up to the wellhead through the second drilling tool, and the telescopic outer tube is stretched;

[0012] (3) The cable is fished out through the inside of the first drilling tool, the cable is straightened, the head of the cable is connected to a quick connector at the wellhead, and the cable is fished out by a core-penetrating fishing method.

[0013] The present invention adopts a method of lowering a self-locking fishing hook through the interior of a first drilling tool to the bottom of a salvage tube, and under the action of a spring, the telescopic outer cylinder is compressed, and the bottom of the telescopic outer cylinder contacts the bottom of the salvage, and after the fishing hook salvages the down-well cable, the down-well cable is pulled up through the second drilling tool, and the telescopic outer cylinder is stretched, and the down-well cable is fished out through the interior of the first drilling tool, and the down-well cable is pulled until it reaches a certain tension, and the head of the down-well cable is connected to a quick connector at the wellhead, and the down-well cable is salvaged by a core-penetrating salvage method, which can quickly salvage the down-well cable and stuck tools in the well, reduce the number of drilling trips and the workload, shorten the construction period, improve the salvage efficiency, and effectively avoid excessive drilling and long-term operation to wear the well wall or casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the present invention before salvaging the cable.

[0015] Figure 2 It is a schematic structural diagram of the present invention when salvaging a cable.

[0016] Figure 3 yes Figure 1 Schematic diagram of the structure of the self-locking fishing hook 3. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] Example 1

[0019] like Figure 1-3 As shown, the downhole cable re-threading salvage device of this embodiment is composed of a first drilling tool 1, a salvage tube 2, and a self-locking salvage hook 3.

[0020] A fishing tube 2 is installed at the lower end of the first drilling tool 1. The midline of the first drilling tool 1 and the midline of the fishing tube 2 are the same straight line. A self-locking fishing hook 3 is installed in the middle of the first drilling tool 1 and the fishing tube 2. The self-locking fishing hook 3 is composed of a second drilling tool 301, a connector 302, a telescopic outer cylinder 303, a spring 304, and a fishing hook 305. The self-locking fishing hook 3 is the lower end of the second drilling tool 301 connected to the telescopic outer cylinder 303 through the connector 302. The telescopic outer cylinder 303 is a cylindrical cylinder with an inner diameter of 60 mm. The angle α between the plane where the bottom surface of the telescopic outer cylinder 303 is located and the plane where the horizontal plane is located is 37°. A spring 304 is installed in the telescopic outer cylinder 303, the upper end of the spring 304 is connected to the connecting head 302, and the lower end of the spring 304 is connected to the inside of the telescopic outer cylinder 303. The telescopic outer cylinder 303 is telescopic and retracted under the action of the spring 304. A fishing hook 305 is installed at the lower end of the connecting head 302 inside the telescopic outer cylinder 303. The fishing hook 305 is used to salvage the down-hole cable 4. The present invention can quickly salvage the down-hole cable 4 and stuck tools, reduce the number of drilling trips and the workload, shorten the construction period, improve the salvage efficiency, and effectively avoid the wear of the well wall or casing caused by excessive drilling and long-term operation.

[0021] Example 2

[0022] A fishing tube 2 is installed at the lower end of the first drilling tool 1. The midline of the first drilling tool 1 and the midline of the fishing tube 2 are the same straight line. A self-locking fishing hook 3 is installed in the middle of the first drilling tool 1 and the fishing tube 2. The self-locking fishing hook 3 is composed of a second drilling tool 301, a connector 302, a telescopic outer cylinder 303, a spring 304, and a fishing hook 305. The self-locking fishing hook 3 is the lower end of the second drilling tool 301 connected to the telescopic outer cylinder 303 through the connector 302. The telescopic outer cylinder 303 is a cylindrical cylinder with an inner diameter of 55 mm. The angle α between the plane where the bottom surface of the telescopic outer cylinder 303 is located and the plane where the horizontal plane is located is 35°. A spring 304 is installed inside the telescopic outer cylinder 303. The upper end of the spring 304 is connected to the connector 302, and the lower end of the spring 304 is connected to the inside of the telescopic outer cylinder 303. The telescopic outer cylinder 303 is extended and retracted under the action of the spring 304. A fishing hook 305 is installed at the lower end of the connector 302 inside the telescopic outer cylinder 303. The fishing hook 305 is used to salvage the cable 4 that has fallen into the well.

[0023] Other components and their connection relationships are the same as those in Example 1.

[0024] Example 3

[0025] A fishing tube 2 is installed at the lower end of the first drilling tool 1. The midline of the first drilling tool 1 and the midline of the fishing tube 2 are the same straight line. A self-locking fishing hook 3 is installed in the middle of the first drilling tool 1 and the fishing tube 2. The self-locking fishing hook 3 is composed of a second drilling tool 301, a connector 302, a telescopic outer cylinder 303, a spring 304, and a fishing hook 305. The self-locking fishing hook 3 is the lower end of the second drilling tool 301 connected to the telescopic outer cylinder 303 through the connector 302. The telescopic outer cylinder 303 is a cylindrical cylinder with an inner diameter of 75 mm. The angle α between the plane where the bottom surface of the telescopic outer cylinder 303 is located and the plane where the horizontal plane is located is 40°. A spring 304 is installed inside the telescopic outer cylinder 303. The upper end of the spring 304 is connected to the connector 302, and the lower end of the spring 304 is connected to the inside of the telescopic outer cylinder 303. The telescopic outer cylinder 303 is extended and retracted under the action of the spring 304. A fishing hook 305 is installed at the lower end of the connector 302 inside the telescopic outer cylinder 303. The fishing hook 305 is used to salvage the cable 4 that has fallen into the well.

[0026] Other components and their connection relationships are the same as those in Example 1.

[0027] The steps of using the downhole cable re-threading and salvage device are as follows:

[0028] (1) Place the first drilling tool 1 and the overshot tube 2 into the well 5 and lower them to the head of the downhole cable 4;

[0029] (2) The self-locking fishing hook 3 is lowered through the first drilling tool 1 to the bottom of the overshot tube 2. Under the action of the spring 304, the telescopic outer tube 303 is compressed, and the bottom of the telescopic outer tube 303 contacts the bottom of the overshot tube 2. The fishing hook 305 extends from the bottom of the overshot tube 2 to salvage the downhole cable 4. After salvaging, the downhole cable 4 is pulled up to the wellhead through the second drilling tool 301, and the telescopic outer tube 303 is stretched;

[0030] (3) The cable 4 is fished out through the first drilling tool 1, straightened, and the head of the cable 4 is connected to a quick connector at the wellhead. The cable 4 is fished out by a core-penetrating fishing method.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A method for re-threading and salvaging a cable that has fallen into a well, characterized in that: The device used in the salvage method is composed of a first drilling tool (1), a salvage tube (2), and a self-locking salvage hook (3). The salvage tube (2) is arranged at the lower end of the first drilling tool (1). The midpoint of the first drilling tool (1) and the midpoint of the salvage tube (2) are the same straight line. A self-locking salvage hook (3) is arranged in the middle of the first drilling tool (1) and the salvage tube (2). The self-locking salvage hook (3) is composed of a second drilling tool (301), a connector (302), a telescopic outer tube (303), a spring (304), and a plurality of springs (305). 04), a fishing hook (305) is connected to the second drilling tool (301), the lower end of the second drilling tool (301) is connected to the telescopic outer cylinder (303) through a connecting head (302), the telescopic outer cylinder (303) is a cylindrical cylinder, a spring (304) is arranged inside the telescopic outer cylinder (303), the upper end of the spring (304) is connected to the connecting head (302), the lower end of the spring (304) is connected to the inside of the telescopic outer cylinder (303), and a fishing hook (305) is arranged at the lower end of the connecting head (302) inside the telescopic outer cylinder (303); The salvage method consists of the following steps: (1) placing the first drilling tool (1) and the overshot tube (2) into the well (5) and lowering them to the head position of the downhole cable (4); (2) The self-locking fishing hook (3) is lowered through the interior of the first drilling tool (1) to the bottom of the overshot tube (2). Under the action of the spring (304), the telescopic outer tube (303) is compressed, and the bottom of the telescopic outer tube (303) contacts the bottom of the overshot tube (2). The fishing hook (305) extends from the bottom of the overshot tube (2) to salvage the downhole cable (4). After salvaging, the downhole cable (4) is pulled up to the wellhead through the second drilling tool (301), and the telescopic outer tube (303) is stretched; (3) The downhole cable (4) is fished out through the interior of the first drilling tool (1), the downhole cable (4) is straightened, the head of the downhole cable (4) is connected to a quick connector at the wellhead, and the downhole cable (4) is fished out by a core-penetrating fishing method.

2. The method for re-threading and salvaging a cable dropped into a well according to claim 1, characterized in that: The inner diameter of the telescopic outer cylinder (303) is 55-75 mm.

3. The method for re-threading and salvaging a cable dropped into a well according to claim 1, characterized in that: The angle α between the plane where the bottom surface of the telescopic outer cylinder (303) is located and the plane where the horizontal plane is located is 35° to 40°.

Images