CN114687698B - A removable fishing tool for unblocking bridge plugs - Google Patents

Abstract

The invention discloses a removable bridge plug unclamping and salvaging tool, which consists of a cable joint, a conversion nipple, a main sleeve, an electric cylinder mandrel, an electric cylinder column, an electric cylinder core sleeve, an electric cylinder sleeve, a threaded sleeve, a transmission stud, a main sleeve base and an outer sleeve, and is characterized in that: the outer sleeve conical cavity is retracted by laterally extruding a spring pin on the bridge plug, and the outer sleeve conical cavity pops up after passing through an inner step of the outer sleeve conical cavity, so that axial limiting is realized. The electric cylinder core shaft is in threaded connection with the electric cylinder core shaft sleeve, the electric cylinder core shaft is rotated to drive the electric cylinder core shaft sleeve to axially move, and the electric cylinder core shaft sleeve is in threaded connection with the main sleeve base, so that the main sleeve base axially moves to push the removable bridge plug bearing neck to axially move, a sealing loop inside the removable bridge plug is opened, the inside and outside of the bridge plug are communicated with each other through liquid, and then a recovery tool is lifted up to finish unsealing and recovery of the removable bridge plug. The invention has simple structure and easy operation, can realize the deblocking and recycling actions of the removable bridge plug and can be repeatedly used.

Description

A removable fishing tool for unblocking bridge plugs

technical field

The invention relates to an auxiliary tool for the plugging operation of a production pipe string used in petroleum workover operations, in particular to a removable fishing tool for unblocking bridge plugs, which belongs to the technical field of downhole operations.

Background technique

The role of the bridge plug is to seal the oil and gas well, which has the characteristics of less construction procedures, short cycle and accurate sealing position. Bridge plugs are divided into disposable cast iron bridge plugs, soluble bridge plugs, removable bridge plugs and other categories. Disposable cast iron bridge plugs need to be removed in the next drill, which is cumbersome and costly; the dissolution rate of soluble bridge plugs depends on their own materials, and the working conditions have little influence on them, so they are not generally applicable; removable bridge plugs It has the advantages of meeting engineering requirements and being reusable, making it the best choice for oil and gas well seals to improve efficiency and reduce consumption. Therefore, the invention of a removable fishing tool for bridge plug release is of great significance for improving the efficiency of workover operations and increasing the comprehensive economic benefits of a single well.

Contents of the invention

The purpose of the invention is to realize the unsealing and recovery of the removable bridge plug. A removable bridge plug unblocking fishing tool is provided. The removable bridge plug is unsealed through the action of an electric cylinder, and the removable bridge plug is recovered after the unsealing is completed.

The technical scheme adopted in the present invention is:

A removable fishing tool for unblocking bridge plugs, consisting of a cable joint, a conversion nipple, a main sleeve, an electric cylinder mandrel, an electric cylinder column, an electric cylinder mandrel sleeve, an electric cylinder positioning screw, an electric cylinder sleeve, and a threaded sleeve Tube, transmission stud, main sleeve base, outer sleeve, characterized in that: one end of the electric cylinder mandrel sleeve is processed with threads and 2 through holes, the external thread of the electric cylinder mandrel sleeve and the internal thread of the transmission stud Screwed together, the through hole at the lower end of the electric cylinder mandrel sleeve and the through hole at the upper end of the electric cylinder mandrel sleeve are used to install the transmission pin. There are 4 electric cylinder bushing through holes in the circumferential direction of the electric cylinder bushing, which are used to install the positioning screws of the electric cylinder. The threaded sleeve is processed with external threads and has 4 small holes evenly distributed on one end surface thereof, and has a large hole and a ring groove at the same time. The inner diameter of the ring groove is equal to the outer diameter of the lower end of the electric cylinder sleeve, and the outer thread is used for thread The connection between the sleeve and the main sleeve, 4 small holes are used to install the positioning screws of the electric cylinder. Both ends of the transmission stud are provided with threads, and the external thread of the transmission stud is screwed with the internal thread of the base of the main sleeve. The upper end of the outer sleeve is provided with an inner thread of the outer sleeve to connect with the main sleeve, and a tapered cavity is arranged inside the lower end to compress the spring pin.

Compared with the prior art, the beneficial effect of the patented tool of the present invention is that the removable bridge plug carried by the spring pin can be recovered safely and effectively.

Description of drawings

Fig. 1 is a structural schematic diagram of a removable bridge plug unblocking fishing tool;

Fig. 2 is the structural representation of electric cylinder;

Fig. 3 is a structural schematic diagram of a conversion sub;

Fig. 4 is a schematic structural view of the electric cylinder core shaft sleeve;

Fig. 5 is a structural schematic diagram of an electric cylinder bushing;

Fig. 6 is the structural representation of threaded sleeve;

Fig. 7 is the structural representation of transmission stud;

Fig. 8 is a structural schematic diagram of the main sleeve base;

Fig. 9 is a schematic structural view of the outer sleeve;

In the figure: 1. Cable connector, 1a. Cable connector upper connector, 1b. Cable connector cavity, 1c. Cable connector lower connector, 1d. Cable connector external thread, 2. Conversion nipple, 2a. Conversion nipple internal thread, 2b. Conversion nipple external thread, 3. Main sleeve, 4. Electric cylinder mandrel, 5. Electric cylinder column, 6. Electric cylinder mandrel sleeve, 6a. Electric cylinder mandrel sleeve external thread, 6b. Electric cylinder core The through hole at the lower end of the shaft sleeve, 6c. The through hole at the upper end of the core shaft sleeve of the electric cylinder, 7. The positioning screw of the electric cylinder, 8. The shaft sleeve of the electric cylinder, 8a. The through hole of the shaft sleeve of the electric cylinder, 9. The threaded sleeve, 9a. The external thread , 9b. Small hole, 9c. Large hole, 9d. Ring groove, 10. Drive stud, 10a. Drive stud internal thread, 10b. Drive stud external thread, 11. Main sleeve base, 11a. Main sleeve Base internal thread, 12. Outer sleeve, 12a. Outer sleeve internal thread, 12b. Outer sleeve tapered cavity

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Fig. 1-Fig. 8, a detachable fishing tool for bridge plug release consists of a cable joint 1, a conversion nipple 2, a main sleeve 3, an electric cylinder mandrel 4, an electric cylinder column 5, and an electric cylinder mandrel Sleeve 6, electric cylinder positioning screw 7, electric cylinder shaft sleeve 8, threaded sleeve 9, transmission stud 10, main sleeve base 11, outer sleeve 12, characterized in that: the cable joint 1 is formed by the cable joint Joint 1a, cable joint cavity 1b, cable joint lower joint 1c, and cable joint external thread 1d is used for connecting cable joint 1 and conversion nipple 2. The internal thread 2a of the conversion nipple is used for the connection between the lower joint 1c of the cable joint and the conversion nipple 2, and the external thread 2b of the conversion nipple is used for the connection between the main sleeve 3 and the conversion nipple 2. The main sleeve 3 is threadedly connected with the threaded sleeve 9 and the outer sleeve 12 . The conical cavity 12b of the outer sleeve 12 is retracted by pressing the spring pin on the bridge plug sideways, and pops out after passing through the step in the conical cavity 12b to realize the axial limit. The electric cylinder mandrel 4 and the electric cylinder mandrel sleeve 6 are connected by threads. When working, the electric cylinder mandrel 4 rotates to drive the electric cylinder mandrel 6 to move axially; because the electric cylinder mandrel 6 and the main sleeve base 11 adopt Threaded connection, so the main sleeve base 11 moves axially; the main sleeve base 11 pushes the bearing neck of the removable bridge plug to move axially, and opens the sealed circuit inside the removable bridge plug, so that the liquid inside and outside the bridge plug is connected. After the hydraulic balance, the fishing tool is lifted up to complete the unsealing and recovery of the retrievable bridge plug.

The specific implementation methods described above are used to illustrate the patent rather than limit the scope of the patent. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the patent belong to the patent system protected range.

Claims (2)

1. A removable fishing tool for bridge plug release, consisting of a cable joint (1), a conversion pup joint (2), a main sleeve (3), an electric cylinder mandrel (4), an electric cylinder column (5), an electric cylinder Cylinder core shaft sleeve (6), electric cylinder positioning screw (7), electric cylinder shaft sleeve (8), threaded sleeve (9), transmission stud (10), main sleeve base (11), outer sleeve ( 12) Composition, characterized in that: one end of the electric cylinder mandrel sleeve (6) is processed with threads and two through holes, the external thread of the electric cylinder mandrel sleeve (6a) is screwed with the internal thread of the transmission stud (10a), The through hole (6b) at the lower end of the electric cylinder mandrel bushing and the through hole (6c) at the upper end of the electric cylinder mandrel bushing are used to install the transmission pin; the electric cylinder bushing (8) has four through holes (8a ), used to install the electric cylinder set screw (7); the threaded sleeve (9) is processed with external threads (9a) and has 4 small holes (9b) evenly distributed on one end surface thereof, and has a large hole ( 9c) and the annular groove (9d), the inner diameter of the annular groove (9d) is equal to the outer diameter of the lower end of the electric cylinder bushing (8), and the external thread (9a) is used for the connection between the threaded sleeve (9) and the main sleeve (3) connection, 4 small holes (9b) are used to install electric cylinder positioning screws (7); the two ends of the transmission stud (10) are provided with threads, the external thread of the transmission stud (10b) and the internal thread of the main sleeve base ( 11a) Screwing; the upper end of the outer sleeve (12) is provided with an outer sleeve internal thread (12a) to connect with the main sleeve (3), and the lower end is provided with a tapered cavity (12b) to compress the spring pin back role. 2. A removable fishing tool for bridge plug release according to claim 1, characterized in that: the cable joint (1) consists of a cable joint upper joint (1a), a cable joint cavity (1b), a cable joint The lower joint (1c) is composed of the outer thread of the cable joint (1d) for the connection between the cable joint (1) and the conversion nipple (2); the inner thread of the conversion nipple (2a) is used for the connection between the lower joint of the cable joint (1c) and the conversion The connection of the nipple (2), the outer thread of the adapter nipple (2b) is used for the connection of the main sleeve (3) and the adapter nipple (2); the main sleeve (3) and the threaded sleeve (9) and the jacket The barrel (12) is connected by thread; the conical cavity (12b) of the outer sleeve (12) squeezes the spring pin on the bridge plug from the side to cause it to retract, and it will pop out after passing through the inner step of the conical cavity (12b) , realize the axial limit; the electric cylinder mandrel (4) and the electric cylinder mandrel sleeve (6) are threadedly connected, and when working, the electric cylinder mandrel (4) rotates to drive the electric cylinder mandrel sleeve (6) to move axially ;Because the electric cylinder core shaft sleeve (6) is threadedly connected with the main sleeve base (11), the main sleeve base (11) moves axially; the main sleeve base (11) pushes the removable bridge plug bearing neck axially Move and open the sealing circuit inside the removable bridge plug, so that the liquid inside and outside the bridge plug is connected. After the internal and external hydraulic pressure of the bridge plug is balanced, the fishing tool is lifted up to complete the unsealing and recovery of the retrievable bridge plug.