Telescopic underground connecting device

Abstract

The utility model discloses a telescopic underground connecting device, which belongs to the technical field of petroleum drilling engineering, and comprises a telescopic rod inner core, one end of the telescopic rod inner core is connected with an outer cylinder, a telescopic rod body is slidably connected in the outer cylinder, one end of the telescopic rod body is connected with a fixed end, and the fixed end is connected with the telescopic rod body. A first protective ring and a second protective ring are sleeved outside the telescopic rod inner core, a spring wire is arranged in the telescopic rod body, a first T-shaped sealing ring is connected in the outer cylinder, and a second T-shaped sealing ring is connected in the telescopic rod body. According to the telescopic underground connecting device, by arranging the telescopic rod body, the fixed end, the first high-pressure connecting plug, the second O-shaped sealing ring, the spring wire and the second high-pressure connecting plug, the connecting device has a telescopic function, connection between two underground drill collars is facilitated, the phenomenon that internal instruments are shortened due to drill collar repairing and buckling is avoided, and the telescopic underground connecting device is convenient to work and high in reliability.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil drilling engineering, and specifically relates to a telescopic downhole connection device. Background Art

[0002] In recent years, with the increase in the drilling workload of onshore horizontal wells and highly deviated wells as well as the demand for offshore drilling, conventional wireline logging can no longer meet the needs of logging technology. Therefore, logging-while-drilling technology has developed very rapidly. At present, measurement-while-drilling and logging-while-drilling systems have become an indispensable part of the oil drilling engineering field, and the acquisition of downhole data is even more crucial. The connection and communication between measurement-while-drilling and logging-while-drilling, as well as the signal transmission, are also particularly important. Most of the structural designs on the market are mainly hard connections of rods. After the drill collar is used for a period of time, it is inevitable that threading needs to be repaired, and the corresponding internal connecting rods also need to be shortened synchronously, resulting in a reduction in the use efficiency. Content of the Utility Model

[0003] In order to overcome the above defects, the utility model provides a telescopic downhole connection device, which solves the problem that most of the structural designs on the market are mainly hard connections of rods. After the drill collar is used for a period of time, it is inevitable that threading needs to be repaired, and the corresponding internal connecting rods also need to be shortened synchronously, resulting in a reduction in the use efficiency.

[0004] To achieve the above purpose, the utility model provides the following technical solution: a telescopic downhole connection device, including an inner core of the telescopic rod, one end of the inner core of the telescopic rod is connected with an outer cylinder, a telescopic rod body is slidably connected inside the outer cylinder, one end of the telescopic rod body is connected with a fixed end, a first protective ring and a second protective ring are sleeved outside the inner core of the telescopic rod, a spring wire is arranged inside the telescopic rod body, a first T-shaped sealing ring is connected inside the outer cylinder, a second T-shaped sealing ring is connected inside the telescopic rod body, a second high-pressure connection plug is connected inside the fixed end, a second locking nut is threadedly connected inside the second high-pressure connection plug, a second O-shaped sealing ring is connected inside the fixed end, a first high-pressure connection plug is connected inside the inner core of the telescopic rod, a first locking nut is threadedly connected inside the first high-pressure connection plug, and a first O-shaped sealing ring is connected inside the outer cylinder.

[0005] As a further solution of the utility model: the second high-pressure connection plug is connected with the fixed end through the second locking nut, and the first high-pressure connection plug is connected with the inner core of the telescopic rod through the first locking nut.

[0006] As a further solution of the utility model: the longest state of the telescopic rod body is 1442.45 mm, the shortest state is 1092.45 mm, the ultimate telescopic stroke is 400 mm, and the safety stroke is 350 mm.

[0007] As a further solution of the present utility model: a bolt is connected to the first protective ring, and a groove is formed in the second protective ring.

[0008] As a further solution of the present utility model: a rotating plate is externally threaded to the bolt, the bolt is clamped in the groove, and the rotating plate abuts against the second protective ring.

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows: 1. For this telescopic downhole connection device, by setting the telescopic rod body, fixed end, first high-pressure connection plug, second O-ring, spring wire and second high-pressure connection plug, the inner core and outer cylinder of the telescopic rod can be moved up and down at the upper and lower ends of the telescopic rod body through threaded connection. The fixed end is fixed to the upper instrument through threaded connection, the telescopic rod body is fixed to the fixed end through threaded connection, and is sealed with a second O-ring. The intermediate communication connection line uses a spring wire, which has the ability of stretching and restoring. This connection device has the function of telescoping, facilitating the connection between two drill collars downhole, avoiding the phenomenon that the internal instrument becomes shorter due to the repair of the drill collar thread, and is convenient to work with strong reliability.

[0010] 2. For this telescopic downhole connection device, by setting the bolt and the rotating plate, when the first protective ring and the second protective ring are in contact, the rotating plate rotates on the surface of the bolt and then abuts against the first protective ring, enabling the first protective ring and the second protective ring to be quickly assembled, and after being fixed, the first protective ring and the second protective ring can play a certain sealing role at the connection between the inner core and the outer cylinder of the telescopic rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional structural schematic diagram of the present utility model.

[0012] Figure 2 It is a three-dimensional sectional structural schematic diagram of the telescopic rod body of the present utility model.

[0013] Figure 3 For the present utility model Figure 2 The enlarged structural schematic diagram at position A.

[0014] Figure 4 It is a three-dimensional sectional structural schematic diagram of the outer cylinder of the present utility model.

[0015] In the figure: 1. Inner core of the telescopic rod; 2. Outer cylinder; 3. Telescopic rod body; 4. Fixed end; 5. First T-shaped sealing ring; 6. First locking nut; 7. First high-pressure connection plug; 8. First O-ring; 9. Second O-ring; 10. Spring wire; 11. First protective ring; 12. Second protective ring; 13. Second high-pressure connection plug; 14. Second locking nut; 15. Second T-shaped sealing ring; 16. Bolt; 17. Groove; 18. Rotating plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solution of this patent will be further described in detail below in conjunction with specific embodiments.

[0017] As Figures 1-4 shown, the present utility model provides a technical solution: a telescopic downhole connection device, including an inner core 1 of a telescopic rod, one end of the inner core 1 of the telescopic rod is connected to an outer cylinder 2, a telescopic rod body 3 is slidably connected inside the outer cylinder 2, one end of the telescopic rod body 3 is connected to a fixed end 4, a first protective ring 11 and a second protective ring 12 are sleeved outside the inner core 1 of the telescopic rod, a bolt 16 is connected to the first protective ring 11, a groove 17 is formed inside the second protective ring 12, the bolt 16 is externally threaded with a rotating plate 18, the bolt 16 is clamped in the groove 17, and the rotating plate 18 overlaps with the second protective ring 12. By providing the groove 17, when the second protective ring 12 is connected to the first protective ring 11, the bolt 16 above the first protective ring 11 will penetrate the groove 17, so that the groove 17 plays a certain auxiliary role for the second protective ring 12, avoiding the situation that the position of the second protective ring 12 deviates after being connected to the first protective ring 11.

[0018] A spring wire 10 is provided inside the telescopic rod body 3, a first T-shaped sealing ring 5 is connected inside the outer cylinder 2, a second T-shaped sealing ring 15 is connected inside the telescopic rod body 3, a second high-pressure connection plug 13 is connected inside the fixed end 4, and a second locking nut 14 is internally threaded with the second high-pressure connection plug 13. By providing the spring wire 10, the spring wire 10 has strong recovery ability, and the telescopic rod body 3 is made of Inconel718 material, which has strong anti-scouring ability.

[0019] A second O-shaped sealing ring 9 is connected inside the fixed end 4, a first high-pressure connection plug 7 is connected inside the inner core 1 of the telescopic rod, a first locking nut 6 is internally threaded with the first high-pressure connection plug 7, and a first O-shaped sealing ring 8 is connected inside the outer cylinder 2. By providing the first T-shaped sealing ring 5, the first T-shaped sealing ring 5 with strong sealing performance is used for sealing to improve the sealing effect.

[0020] The second high-pressure connection plug 13 is connected to the fixed end 4 through the second locking nut 14, the first high-pressure connection plug 7 is connected to the inner core 1 of the telescopic rod through the first locking nut 6. The longest state of the telescopic rod body 3 is 1442.45 mm, the shortest state is 1092.45 mm, the ultimate telescopic stroke is 400 mm, and the safety stroke is 350 mm. By providing the first T-shaped sealing ring 5, the first high-pressure connection plug 7 and the second high-pressure connection plug 13, the first T-shaped sealing ring 5 has strong sealing ability underground, and the mud will not flow into the inner cavity of the telescopic rod body 3. Even if the seal fails, the first high-pressure connection plug 7 and the second high-pressure connection plug 13 will protect the instruments at the upper and lower ends and prevent the mud from entering the inner cavity.

[0021] The working principle of the present utility model is as follows: During use, the first protective ring 11 and the second protective ring 12 can be sleeved at the connection between the inner core 1 of the telescopic rod and the outer cylinder 2. The second protective ring 12 will penetrate through the groove 17, the bolt 16 and the rotating plate 18. When the second protective ring 12 meshes with the first protective ring 11, it drives the rotating plate 18 to rotate. After the rotating plate 18 rotates, it will overlap with the first protective ring 11. The inner core 1 and the outer cylinder 2 of the telescopic rod are threadedly connected to enable movement at the upper and lower ends of the telescopic rod body 3. The fixed end 4 and the upper instrument are fixed by threaded connection. The telescopic rod body 3 and the fixed end 4 are fixed by threaded connection and are sealed with a second O-ring 9. The intermediate communication connecting wire uses a spring wire 10, which has the ability to stretch and recover. The first T-shaped seal ring 5 has a strong sealing ability underground, and mud will not flow into the inner cavity of the telescopic rod body 3. Even if the seal fails, the first high-pressure connection plug 7 and the second high-pressure connection plug 13 will protect the upper and lower instruments and prevent mud from entering the inner cavity.

[0022] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0023] The above has made a detailed description of the preferred embodiment of this patent. However, this patent is not limited to the above embodiment. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of this patent.

Claims

1. A telescopic downhole connection device, comprising a telescopic rod inner core (1), characterized in that: One end of the telescopic rod inner core (1) is connected to an outer cylinder (2), a telescopic rod body (3) is slidably connected inside the outer cylinder (2), one end of the telescopic rod body (3) is connected to a fixed end (4), a protective ring 1 (11) and a protective ring 2 (12) are connected to the outer surface of the telescopic rod inner core (1), a spring wire (10) is arranged inside the telescopic rod body (3), a T-shaped sealing ring 1 (5) is connected inside the outer cylinder (2), a T-shaped sealing ring 2 (15) is connected inside the telescopic rod body (3), a second high-pressure connection plug (13) is connected inside the fixed end (4), a second locking nut (14) is internally threadedly connected to the second high-pressure connection plug (13), a second O-shaped sealing ring (9) is connected inside the fixed end (4), a first high-pressure connection plug (7) is connected inside the telescopic rod inner core (1), a first locking nut (6) is internally threadedly connected to the first high-pressure connection plug (7), and a first O-shaped sealing ring (8) is connected inside the outer cylinder (2).

2. A retractable downhole connection device according to claim 1, characterized in that: The second high-pressure connection plug (13) is connected to the fixed end (4) via a second locking nut (14), and the first high-pressure connection plug (7) is connected to the telescopic rod inner core (1) via a first locking nut (6).

3. A retractable downhole connection device according to claim 1, characterized in that: The telescopic rod body (3) is 1442.45 mm in its longest state and 1092.45 mm in its shortest state, has an ultimate telescopic stroke of 400 mm and a safety stroke of 350 mm.

4. The retractable downhole connection device according to claim 1, characterized in that: The first protective ring (11) is connected with a bolt (16), and the second protective ring (12) is provided with a groove (17).

5. A retractable downhole connection device according to claim 4, characterized in that: The bolt (16) is externally threadedly connected to a rotating plate (18), the bolt (16) is clamped in the groove (17), and the rotating plate (18) overlaps the second protective ring (12).

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