Device for quickly connecting downhole instruments

Abstract

The device comprises a main machine and a slave machine, the main machine is provided with a main transmission shaft, the lower end of the main transmission shaft is connected with a coupler, the slave machine is provided with a slave transmission shaft, the slave machine is inserted into an inner hole of the main machine, the slave transmission shaft is connected with the main transmission shaft through the coupler, and the outer wall of the main machine is sleeved with a sliding sleeve. The sliding sleeve is provided with an inner circle step, a reset spring is arranged between the sliding sleeve and the main machine, a plurality of steel balls which are evenly arranged in the circumferential direction are installed in an inner hole of the main machine, the steel balls abut against the sliding sleeve, an anti-falling cap is arranged outside the driven transmission shaft, and the anti-falling cap is provided with a clamping groove. The sliding sleeve moves to drive the steel balls to move up and down in the radial direction so that the steel balls can clamp or loosen the anti-falling cap. Rapid butt joint of the master machine and the slave machine is achieved through movement of the sliding sleeve, power transmission and communication are achieved at the same time, connection is easy, convenient and reliable, and pollution such as oil and water is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of oil field downhole instruments, and in particular to a downhole instrument quick connection device. Background Art

[0002] At present, downhole testing in oil fields is very common. It is necessary to connect multiple instruments for testing. There are more and more test data and parameters, and the instrument strings that need to be connected are getting longer and longer. Various combinations are required between the functional short sections. The operation of connecting instruments in series on site is becoming more and more frequent. However, due to the need for power transmission and communication transmission, the current conventional methods all use various electrical connectors and threads for connection. In the various water pollution environments on the oil field site, water often enters the instrument connection part or makes it dirty, which brings risks such as communication short circuit or sticking of the instrument thread connection, affecting the service life of the instrument and delaying the on-site testing. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a device for quickly connecting downhole instruments, which can realize power transmission and communication between instruments, and the connection is simple and reliable, and is not afraid of pollution such as oil and water.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a device for quick connection of downhole instruments, comprising a main machine and a slave machine, the main machine is provided with a main transmission shaft, the lower end of the main transmission shaft is connected to a coupling, the slave machine is provided with a slave transmission shaft, the slave machine is inserted into the inner hole of the main machine, the slave transmission shaft is connected to the main transmission shaft through a coupling, a sliding sleeve is sleeved on the outer wall of the main machine, the sliding sleeve is provided with an inner circle step, a reset spring is provided between the sliding sleeve and the main machine, a plurality of steel balls evenly arranged along the circumferential direction are installed in the inner hole of the main machine, the steel balls abut against the sliding sleeve, an anti-drop cap is provided on the outside of the slave transmission shaft, the anti-drop cap is provided with a slot, the sliding sleeve moves to drive the steel ball to move up and down radially so that the steel ball can get stuck or release the anti-drop cap.

[0005] The interior of the sliding sleeve is provided with a first inner circle step, a second inner circle step and a third inner circle step with decreasing heights in sequence, and the sliding sleeve moves so that the steel ball abuts against the second inner circle step or the third inner circle step.

[0006] A main communication circle is arranged in the inner hole of the host, and a slave communication circle is arranged in the inner hole of the slave. The main communication circle and the slave communication circle are connected by magnetic coupling induction.

[0007] An anti-rotation block is installed at the end of the slave machine, an anti-rotation spring is arranged inside the anti-rotation block, an anti-rotation notch is arranged on the outer wall of the end of the inner hole of the host machine, and the anti-rotation block is engaged with the anti-rotation notch.

[0008] A buffer spring is sleeved on the outer wall of the coupling.

[0009] The front end of the anti-drop cap is chamfered.

[0010] Beneficial effects of the present invention: 1. The traditional threaded connection between tools is changed to an insertion connection, which is easy to operate and improves work efficiency; 2. The reliability of the connection is ensured by the card connection between the steel ball and the anti-drop cap, and the cooperation between the anti-rotation block and the anti-rotation notch; 3. The communication between the host and the slave is connected through magnetic coupling induction. The communication process does not require physical contact, and there is no need for multi-core connectors for communication, making the connection faster; 4. No fear of oil pollution, strong environmental adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 It is a schematic diagram of the assembly of the present invention; Figure 2 It is a structural schematic diagram of the host of the present invention; Figure 3 It is a structural schematic diagram of the slave device of the present invention; Figure 4 for Figure 3 Partial cross-sectional view.

[0012] In the figure: 1. main transmission shaft; 2. coupling; 3. slave transmission shaft; 4. sleeve; 41. first inner circle step; 42. second inner circle step; 43. third inner circle step; 5. reset spring; 6. steel ball; 7. anti-drop cap; 71. slot; 8. main communication circle; 9. slave communication circle; 10. anti-rotation block; 11. anti-rotation spring; 12. anti-rotation notch; 13. buffer spring. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0014] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments. Example

[0015] like Figures 1 to 4As shown, the present invention provides a device for quick connection of downhole instruments, including a main machine and a slave machine, the main machine is provided with a main transmission shaft 1, the lower end of the main transmission shaft 1 is connected to a coupling 2, the slave machine is provided with a slave transmission shaft 3, the slave machine is inserted into the inner hole of the main machine, the slave transmission shaft 3 is connected to the main transmission shaft 1 through the coupling 2, a sliding sleeve 4 is sleeved on the outer wall of the main machine, a reset spring 5 is provided between the sliding sleeve 4 and the main machine, a plurality of steel balls 6 uniformly arranged along the circumferential direction are installed in the inner hole of the main machine, the steel balls 6 abut against the sliding sleeve 4, an anti-drop cap 7 is provided on the outside of the slave transmission shaft 3, the anti-drop cap 7 is provided with a slot 71, the sliding sleeve 4 moves to drive the steel ball 6 to move up and down in the radial direction so that the steel ball 6 is stuck on or releases the anti-drop cap 7.

[0016] Specifically, the inside of the sliding sleeve 4 is provided with a first inner circular step 41, a second inner circular step 42 and a third inner circular step 43 with decreasing heights in sequence, and the sliding sleeve 4 moves to make the steel ball 6 abut against the second inner circular step 42 or the third inner circular step 43; the front end of the anti-drop cap 7 is chamfered.

[0017] Slide the sleeve 4 to the left, and the steel ball 6 moves outward to abut against the third inner circle step 43. Insert the slave into the host, and move the anti-drop cap 7 of the slave to the left of the steel ball 6 so that the steel ball abuts against the slot 71 of the anti-drop cap 7. Release the sleeve 4, and move the sleeve 4 to the right under the elastic force of the reset spring 5. At this time, the steel ball 6 moves inward to abut against the second inner circle step 42. The steel ball 6 cannot move outward under the restriction of the sleeve, so that the anti-drop cap is stuck, so that the host and the slave are docked. This method changes the traditional threaded connection mode to an insertion connection mode, and the connection part does not directly contact the external environment, which is simple to operate, not afraid of oil pollution, and improves work efficiency.

[0018] Specifically, an anti-rotation block 10 is installed at the end of the slave machine, an anti-rotation spring 11 is arranged inside the anti-rotation block 10, an anti-rotation notch 12 is opened on the outer wall of the inner hole end of the host machine, and the anti-rotation block 10 is engaged with the anti-rotation notch 12; a buffer spring 13 is sleeved on the outer wall of the coupling 2.

[0019] After the host machine and the slave machine are connected, the main transmission shaft 1 and the slave transmission shaft 3 are connected through the coupling 2. If the slave transmission shaft 3 is not facing the inner hole of the coupling 2, the coupling 2 will be held by the slave transmission shaft 3 and moved to the left. When the main transmission shaft 1 rotates, the coupling 2 rotates a certain angle, and under the action of the buffer spring 13, the coupling 2 will dock with the slave transmission shaft 3. At this time, the main transmission shaft 1 drives the slave transmission shaft 3 and the slave machine to rotate, so that the anti-rotation block 10 pops out and gets stuck on the anti-rotation notch 12 under the action of the anti-rotation spring 11, thereby realizing continuous output torque to the slave machine.

[0020] Specifically, a main communication circle 8 is provided in the inner hole of the host, and a slave communication circle 9 is provided in the inner hole of the slave, and the main communication circle 8 and the slave communication circle 9 are connected by magnetic coupling induction. After the host and the slave are connected, the main communication circle 8 and the slave communication circle 9 are close together, and the distance is short. Through magnetic coupling induction connection, the communication process does not require physical contact, and no multi-core connector for communication is required, so that the connection is faster.

[0021] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A device for quick connection of downhole instruments, characterized in that: The invention comprises a main machine and a slave machine, wherein the main machine is provided with a main transmission shaft (1), the lower end of the main transmission shaft (1) is connected to a coupling (2), the slave machine is provided with a slave transmission shaft (3), the slave machine is inserted into the inner hole of the main machine, the slave transmission shaft (3) is connected to the main transmission shaft (1) through the coupling (2), a sliding sleeve (4) is sleeved on the outer wall of the main machine, a return spring (5) is provided between the sliding sleeve (4) and the main machine, a plurality of steel balls (6) uniformly arranged along the circumferential direction are installed in the inner hole of the main machine, the steel balls (6) are in contact with the sliding sleeve (4), an anti-drop cap (7) is provided on the outside of the slave transmission shaft (3), the anti-drop cap (7) is provided with a clamping groove (71), the sliding sleeve (4) moves to drive the steel balls (6) to move up and down in the radial direction so that the steel balls (6) are clamped or loosened by the anti-drop cap (7).

2. A downhole instrument quick connection device according to claim 1, characterized in that: The sliding sleeve (4) is provided with a first inner circular step (41), a second inner circular step (42) and a third inner circular step (43) whose heights decrease in sequence. The sliding sleeve (4) moves so that the steel ball (6) abuts against the second inner circular step (42) or the third inner circular step (43).

3. The downhole instrument quick connection device according to claim 1, characterized in that: A main communication circle (8) is provided in the inner hole of the host machine, and a slave communication circle (9) is provided inside the slave machine; the main communication circle (8) and the slave communication circle (9) are connected via magnetic coupling induction.

4. The downhole instrument quick connection device according to claim 1, characterized in that: An anti-rotation block (10) is installed at the end of the slave machine, an anti-rotation spring (11) is arranged inside the anti-rotation block (10), an anti-rotation notch (12) is provided on the outer wall of the end of the inner hole of the master machine, and the anti-rotation block (10) is engaged with the anti-rotation notch (12).

5. The downhole instrument quick connection device according to claim 1, characterized in that: A buffer spring (13) is sleeved on the outer wall of the coupling (2).

6. The downhole instrument quick connection device according to claim 1, characterized in that: The front end of the anti-drop cap (7) is chamfered.

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