Wellhead safe grounding rapid gun connecting device for oil and gas well cable perforation

Abstract

The utility model relates to a well mouth safe grounding and rapid gun connecting device, in particular to a well mouth safe grounding and rapid gun connecting device for oil and gas well cable perforation. The device comprises an upper joint, a middle joint, a connecting sleeve, a lower joint, a combined bearing and an elastic grounding part, a first connecting hole is formed in the upper end of the upper joint; a second connecting hole is formed in the lower end of the upper joint; the lower end of the upper joint fixedly sleeves the upper end of the middle joint through the second connecting hole; the upper end of the connecting sleeve rotatably sleeves the lower end of the middle joint, and the lower end fixedly sleeves the upper end of the lower joint; a mounting groove is formed in the inner wall of the upper end of the connecting sleeve, the combined bearing is mounted in the mounting groove, and an inner ring and an outer ring of the combined bearing are fixedly connected with the outer wall of the middle connector and the inner wall of the connecting sleeve respectively. A third connecting hole is formed in the lower end of the lower joint; the upper end face of the lower connector is provided with a mounting hole, and the elastic grounding part is mounted in the mounting hole. The device can reduce well entering times, reduce operation cost and improve construction efficiency.

Description

Technical Field

[0001] The utility model relates to a wellhead safety grounding and quick gun connecting device, in particular to a wellhead safety grounding and quick gun connecting device for oil and gas well cable perforating. Background Art

[0002] With the advancement of cable perforating technology, single-stage perforation has evolved into multi-stage perforation. This technology is used in oil and gas well development to increase production in wells with multiple perforated intervals. Conventional perforation requires multiple trips due to well depth and the number of perforated intervals. Compared to single-stage perforation, multi-stage perforation can significantly increase oil and gas production, shorten work time, and reduce wellbore contamination.

[0003] However, during the construction of cable multi-stage perforation, due to the height limitation of the workover rig frame, when the tool string is too long, it is impossible to lower the tool string into the well at one time. The tool needs to be lowered into the well in batches, resulting in high construction costs and low efficiency. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problem that in the construction process of existing cable multi-stage perforation, due to the height limitation of the well repair rig frame, the tool string cannot be lowered into the well at one time when it is too long, and the construction needs to be carried out in stages, resulting in high construction cost and low efficiency. The utility model provides a wellhead safe grounding and quick gun connecting device for cable perforation in oil and gas wells.

[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is:

[0006] A wellhead safety grounding quick gun connection device for oil and gas well cable perforating, which is special in that:

[0007] It includes an upper joint, an intermediate joint, a connecting sleeve, a lower joint, a combined bearing and an elastic grounding component;

[0008] The upper end of the upper joint is provided with a first connection hole adapted to the external magnetic positioning terminal, for connecting the external magnetic positioning terminal; the lower end of the upper joint is provided with a second connection hole connected to the first connection hole and adapted to the upper end of the intermediate joint, and the lower end of the upper joint is fixedly sleeved on the upper end of the intermediate joint through the second connection hole;

[0009] The upper end of the connecting sleeve is rotatably sleeved on the lower end of the middle joint, and the lower end is fixedly sleeved on the upper end of the lower joint, and a gap is provided between the lower end surface of the middle joint and the upper end surface of the lower joint;

[0010] The inner wall of the upper end of the connecting sleeve is provided with a mounting groove adapted for the combined bearing. The combined bearing is mounted in the mounting groove, and its inner ring and outer ring are respectively fixedly connected to the outer wall of the intermediate joint and the inner wall of the connecting sleeve;

[0011] The lower end of the lower joint is provided with a third connection hole adapted to the top joint of the perforating gun, for connecting the top joint of the perforating gun; the upper end surface of the lower joint is provided with a mounting hole adapted to the elastic grounding component, and the elastic grounding component is installed in the mounting hole. When the perforating gun is connected, the elastic movable end thereof abuts against the top joint of the perforating gun to achieve grounding.

[0012] Furthermore, the elastic grounding component includes a core shaft, a sleeve, a spring and a nut;

[0013] The core shaft comprises a first sub-shaft and a second sub-shaft which are coaxially connected, wherein the diameter of the first sub-shaft is smaller than the diameter of the second sub-shaft;

[0014] The outer sleeve is slidably mounted on the core shaft, and the inner hole of the outer sleeve includes a first connecting section and a second connecting section connected sequentially from top to bottom; the diameter of the first connecting section is adapted to the diameter of the first sub-shaft, and the diameter of the second connecting section is adapted to the diameter of the second sub-shaft; the upper end of the first sub-shaft and the lower end of the second sub-shaft are respectively placed outside the inner hole of the outer sleeve;

[0015] The spring is sleeved on the first sub-shaft, with its lower end connected to the step between the first sub-shaft and the second sub-shaft, and its upper end connected to the step between the first connecting section and the second connecting section;

[0016] The nut is threadedly mounted on the upper end of the first sub-shaft, and in an initial state, the lower end surface of the nut abuts against the upper end surface of the outer sleeve;

[0017] The core shaft is the elastic movable end of the elastic grounding component, and the second sub-shaft thereof is used to abut against the top joint of the perforating gun when the perforating gun is connected.

[0018] Furthermore, the lower end surface of the second sub-shaft is provided with an inner concave surface.

[0019] Furthermore, the core shaft, outer sleeve, spring and nut are all made of stainless steel.

[0020] Furthermore, a hole retaining ring is provided in the interval, and the outer wall of the hole retaining ring is fixedly connected to the inner wall of the connecting sleeve.

[0021] Furthermore, the combined bearing is a needle roller thrust roller combined bearing.

[0022] Furthermore, the inner ring of the combined bearing is fixedly connected to the outer wall of the intermediate joint through a bearing inner sleeve.

[0023] Furthermore, an annular boss is provided at the lower end of the outer wall of the intermediate joint, and the outer wall of the annular boss is rotatably matched with the inner wall of the connecting sleeve.

[0024] The beneficial effects of the utility model are:

[0025] The utility model relates to a wellhead safety grounding and rapid gun connection device. After connecting the lower connector and the perforating gun, the lower section of the tool string is lifted into the well and clamped at the wellhead with a clamping plate. The upper section of the tool string, which includes the cable magnetic positioning end, is then lifted to the wellhead and connected to the upper connector. That is, the guns are connected in sections in sequence at the wellhead, so that the tool string can be lowered into the well in one go. At the same time, during the gun connection process, the lifting cable is prevented from twisting when the tool string is rotated and connected, eliminating the influence of factors such as static electricity and stray current on the electric detonator, thereby improving the safety performance of the construction process. The device has a simple structure, is stable and reliable, has a high safety factor, reduces the number of well entries, reduces operating costs, and improves on-site construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0027] Figure 2 It is a structural diagram of the elastic grounding component in an embodiment of the present utility model.

[0028] In the figure: 1-upper joint, 2-middle joint, 3-connecting sleeve, 4-lower joint, 5-combined bearing, 6-elastic grounding component, 61-core shaft, 611-first sub-shaft, 612-second sub-shaft; 62-outer sleeve, 621-first connecting section, 622-second connecting section; 63-spring, 64-nut; 7-first connecting hole, 8-third connecting hole, 9-bearing inner sleeve, 10-hole retaining ring. DETAILED DESCRIPTION

[0029] To make the purpose, advantages, and features of the present invention more clear, the following describes in further detail a wellhead safety grounding and rapid gun connection device for cable perforating oil and gas wells, in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent through the following specific embodiments.

[0030] See also Figure 1 The present embodiment is a wellhead safety grounding quick gun connection device for oil and gas well cable perforating, which mainly includes an upper joint 1, an intermediate joint 2, a connecting sleeve 3, a lower joint 4, a combined bearing 5 and an elastic grounding component 6.

[0031] Among them, the upper end face of the upper connector 1 is provided with a first connecting hole 7 adapted to the external magnetic positioning end. When in use, the external magnetic positioning end is connected through the first connecting hole 7 to achieve connection with the upper lifting cable part; the lower end face of the upper connector 1 is provided with a second connecting hole, which is connected to the first connecting hole 7 and adapted to the upper end of the intermediate connector 2. The lower end of the upper connector 1 is fixedly mounted on the upper end of the intermediate connector 2 through the second connecting hole, playing a role of conversion connection.

[0032] The upper end of the connecting sleeve 3 is rotatably mounted on the lower end of the intermediate joint 2, and the lower end is fixedly mounted on the upper end of the lower joint 4. A gap is provided between the lower end surface of the intermediate joint 2 and the upper end surface of the lower joint 4. A hole retaining ring 10 is provided in this gap. The outer wall of the hole retaining ring 10 is fixedly connected to the inner wall of the connecting sleeve 3, limiting the intermediate joint 2 and preventing the intermediate joint 2 from moving downward and rubbing against the end surface of the lower joint 4. An annular boss is provided at the lower end of the outer wall of the intermediate joint 2, and the outer wall of the annular boss is rotatably engaged with the inner wall of the connecting sleeve 3.

[0033] The inner wall of the upper end of the connecting sleeve 3 is provided with a mounting groove compatible with the combined bearing 5. The combined bearing 5 is installed in the mounting groove, and the combined bearing 5 enables easy rotation between the connecting sleeve 3 and the intermediate joint 2. The inner ring of the combined bearing 5 is fixedly connected to the outer wall of the intermediate joint 2 via the bearing inner sleeve 9, which facilitates adjustment of the gap between the bearing and the intermediate joint 2 and plays a role in straightening and centering. The outer ring of the combined bearing 5 is fixedly connected to the inner wall of the connecting sleeve 3; specifically, in this embodiment, the combined bearing 5 is a needle roller thrust roller combination bearing. The combined bearing 5 has a large axial load capacity and can withstand both radial and axial loads. This ensures that when the connecting sleeve 3 is rotated and connected, it can withstand both the axial gravity of the connecting sleeve 3 and the radial offset friction force, preventing the cable from twisting, making the connection easy, and protecting the cable from damage.

[0034] The lower end surface of the lower joint 4 is provided with a third connection hole 8 adapted to the top joint of the perforating gun, for connecting the top joint of the perforating gun; the upper end surface of the lower joint 4 is provided with a mounting hole adapted to the elastic grounding component 6, and the elastic grounding component 6 is installed in the mounting hole. When the perforating gun is connected, its elastic movable end abuts against the top joint of the perforating gun to achieve grounding.

[0035] See also Figure 2 The elastic grounding component 6 of this embodiment specifically includes a core shaft 61, a sleeve 62, a spring 63 and a nut 64.

[0036] The core shaft 61, the outer sleeve 62, the spring 63 and the nut 64 are all made of stainless steel, which ensures electrical conductivity and corrosion resistance.

[0037] The core shaft 61 includes a first sub-shaft 611 and a second sub-shaft 612 that are coaxially connected. The diameter of the first sub-shaft 611 is smaller than the diameter of the second sub-shaft 612. The outer wall of the outer sleeve 62 is threadedly connected to the lower joint 4 so as not to loosen, thereby ensuring the integral rotation of the elastic grounding device and the lower joint 4. The outer sleeve 62 is mounted on the core shaft 61, and its inner hole includes a first connecting section 621 and a second connecting section 622 that are sequentially connected from top to bottom; the diameter of the first connecting section 621 is adapted to the diameter of the first sub-shaft 611, and the diameter of the second connecting section 622 is adapted to the diameter of the second sub-shaft 612; the upper end of the first sub-shaft 611 and the lower end of the second sub-shaft 612 are respectively placed outside the inner hole of the outer sleeve 62; the spring 63 is mounted on the first sub-shaft 611, and its lower end is connected to the first sub-shaft 611. The upper end is connected to the step of the first connecting section 621 and the second connecting section 622 at the step of the second sub-shaft 612; the nut 64 is threadedly mounted on the upper end of the first sub-shaft 611. In the initial state, the lower end face of the nut 64 abuts the upper end face of the outer sleeve 62. The spring 63 has a large elastic compensation amount, which effectively compensates for processing and assembly errors; the core shaft 61 is the elastic movable end of the elastic grounding component 6, and its second sub-shaft 612 is used to abut on the top joint of the perforating gun when connecting the perforating gun.

[0038] Preferably, the lower end face of the second sub-shaft 612 is provided with an inner concave surface to ensure effective contact of the contacts in any state, so that the detonator ignition wire and the ground wire are short-circuited, eliminating the influence of factors such as static electricity and stray current on the electric detonator, and improving the safety performance of the entire system during the installation process.

Claims

1. A wellhead safety grounding and quick gun connection device for cable perforation in oil and gas wells, characterized by: It comprises an upper joint (1), an intermediate joint (2), a connecting sleeve (3), a lower joint (4), a combined bearing (5) and an elastic grounding component (6); The upper end of the upper joint (1) is provided with a first connection hole (7) adapted to the external magnetic positioning terminal and used for connecting the external magnetic positioning terminal; the lower end of the upper joint (1) is provided with a second connection hole connected to the first connection hole (7) and adapted to the upper end of the intermediate joint (2); the lower end of the upper joint (1) is fixedly sleeved on the upper end of the intermediate joint (2) through the second connection hole; The upper end of the connecting sleeve (3) is rotatably mounted on the lower end of the intermediate joint (2), and the lower end is fixedly mounted on the upper end of the lower joint (4), and a gap is provided between the lower end surface of the intermediate joint (2) and the upper end surface of the lower joint (4); The inner wall of the upper end of the connecting sleeve (3) is provided with a mounting groove adapted to the combined bearing (5), and the combined bearing (5) is mounted in the mounting groove, with its inner ring and outer ring being fixedly connected to the outer wall of the intermediate joint (2) and the inner wall of the connecting sleeve (3) respectively; The lower end of the lower joint (4) is provided with a third connection hole (8) adapted to the top joint of the perforating gun, and is used to connect the top joint of the perforating gun; the upper end of the lower joint (4) is provided with a mounting hole connected to the third connection hole (8) and adapted to the elastic grounding component (6); the elastic grounding component (6) is installed in the mounting hole, and its elastic movable end abuts against the top joint of the perforating gun when the lower joint (4) is connected to the perforating gun, thereby achieving grounding.

2. The oil and gas well cable perforating wellhead safety grounding quick gun connection device according to claim 1, characterized in that: The elastic grounding component (6) comprises a core shaft (61), a jacket (62), a spring (63) and a nut (64); The core shaft (61) comprises a first sub-shaft (611) and a second sub-shaft (612) that are coaxially connected, and the diameter of the first sub-shaft (611) is smaller than the diameter of the second sub-shaft (612); The outer sleeve (62) is slidably mounted on the core shaft (61), and its inner hole comprises a first connecting section (621) and a second connecting section (622) connected in sequence from top to bottom; the diameter of the first connecting section (621) is adapted to the diameter of the first sub-shaft (611), and the diameter of the second connecting section (622) is adapted to the diameter of the second sub-shaft (612); the upper end of the first sub-shaft (611) and the lower end of the second sub-shaft (612) are respectively placed outside the inner hole of the outer sleeve (62); The spring (63) is sleeved on the first sub-shaft (611), with its lower end connected to the step between the first sub-shaft (611) and the second sub-shaft (612), and its upper end connected to the step between the first connecting section (621) and the second connecting section (622); The nut (64) is fixedly sleeved on the upper end of the first sub-shaft (611), and in an initial state, the lower end surface of the nut (64) abuts against the upper end surface of the outer sleeve (62); The core shaft (61) is the elastic movable end of the elastic grounding component (6), and the lower end of the second sub-shaft (612) is used to abut against the top joint of the perforating gun when the lower joint (4) is connected to the perforating gun.

3. The wellhead safety grounding quick gun connection device for oil and gas well cable perforation according to claim 2 is characterized by: The lower end surface of the second sub-shaft (612) is provided with an inner concave surface.

4. The wellhead safety grounding quick gun connection device for oil and gas well cable perforation according to claim 3 is characterized by: The core shaft (61), the outer sleeve (62), the spring (63) and the nut (64) are all made of stainless steel.

5. A wellhead safety grounding quick gun connection device for oil and gas well cable perforation according to any one of claims 1 to 4, characterized in that: A hole retaining ring (10) is provided in the interval, and the outer wall of the hole retaining ring (10) is fixedly connected to the inner wall of the connecting sleeve (3).

6. The wellhead safety grounding quick gun connection device for oil and gas well cable perforation according to claim 5, characterized in that: The combined bearing (5) is a needle roller thrust roller combined bearing.

7. The wellhead safety grounding quick gun connection device for oil and gas well cable perforation according to claim 6, characterized in that: The inner ring of the combined bearing (5) is fixedly connected to the outer wall of the intermediate joint (2) via a bearing inner sleeve (9).

8. The wellhead safety grounding quick gun connection device for oil and gas well cable perforation according to claim 1 is characterized by: An annular boss is provided at the lower end of the outer wall of the intermediate joint (2), and the outer wall of the annular boss is rotatably matched with the inner wall of the connecting sleeve (3).

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