Automatic unlocking gripping device for transferring oil and gas fidelity rock core

Abstract

The invention discloses an automatic unlocking gripping device for oil gas fidelity rock core transfer, which comprises a base, a spearhead, a driving mechanism of a base tail end adaptive transfer system, an adjusting inner cavity is arranged at the axis of the head end of the base, a plurality of clamping claws are arranged on the inner wall of the head end of the adjusting inner cavity at equal intervals along the circumferential direction, and the head ends of the clamping claws are rotatably connected with the adjusting inner cavity. A spring element is arranged between the tail end of the clamping claw and the adjusting inner cavity, and the tail end of the base is coaxially and fixedly connected with an unlocking pipeline. The tail end of the fishing spear head is provided with a plurality of limiting discs which are sequentially and fixedly connected in the axial direction, the multiple limiting discs form a tower-shaped structure, the limiting discs are matched with the clamping claws, the head end of the fishing spear head is provided with a clamping groove, and the clamping groove is matched with a rock core. The device has the function of releasing the locking mechanism of the rock core and the pressure-maintaining coring tool, and different operating rod strokes matched with a grabbing mechanism can be achieved.

Description

Technical Field

[0001] This invention relates to the field of core testing equipment, and more particularly to an automatic unlocking and gripping device for transferring oil and gas authentic core samples. Background Technology

[0002] Oil and gas resource extraction faces technical challenges such as distorted sample parameters and inaccurate reservoir patterns, affecting the efficient and safe extraction of deep resources. Pressure-holding coring, by maintaining the in-situ state of the core, offers significant advantages over conventional coring in areas such as understanding oil and gas composition, accuracy of saturation measurement, and rock mechanics testing. The key to pressure-holding cores lies in their stable transfer and testing while maintaining in-situ pressure. For pressure-holding transfer devices, the crucial issue is accurately and reliably performing the core-grabbing operation within the high-pressure chamber and automatically unlocking the sealing control mechanism of the pressure-holding coring tool to allow the core to be removed from the pressure-holding cylinder. Summary of the Invention

[0003] The present invention aims to provide an automatic unlocking and gripping device for transferring oil and gas core samples, which has the function of releasing the locking mechanism between the core and the pressure-holding core sampling tool, and can realize different control lever strokes adapted to the gripping mechanism.

[0004] To achieve the above objectives, the present invention employs the following technical solution: This invention discloses an automatic unlocking and gripping device for transferring oil and gas core samples, including a base and a retrieval head. The tail end of the base is adapted to the drive mechanism of the transfer system. An adjustment cavity is provided at the axial center of the head end of the base. Multiple locking claws are provided at equal intervals along the circumference of the inner wall of the head end of the adjustment cavity. The head end of the locking claws is rotatably connected to the adjustment cavity. A spring element is provided between the tail end of the locking claws and the adjustment cavity. The tail end of the base is coaxially fixed to an unlocking pipe. The tail end of the retrieval head is provided with multiple limiting discs that are sequentially fixed along the axial direction. The multiple limiting discs form a tower-like structure. The limiting discs are adapted to the locking claws. The head end of the retrieval head is provided with a locking groove that is adapted to the core sample.

[0005] Preferably, the drive mechanism includes a hydraulic cylinder and a tie rod, the hydraulic cylinder drives the tie rod, and the head end of the tie rod is detachably connected to a base.

[0006] Preferably, the transfer system includes a connecting section, a detection section, and a transfer section arranged from beginning to end. The connecting section is adapted to a pressure-holding coring tool, and the base and the retrieval spearhead slide within the transfer system.

[0007] Preferably, the transfer system includes a heat preservation and pressure maintenance device.

[0008] Preferably, the detection section includes an MRI scanner and a CT scanner.

[0009] Preferably, the inner wall of the unlocking pipe head has a stepped hole structure.

[0010] This invention can complete the core grabbing in multiple strokes to ensure that the unlocking pipe can reach the position of the core tool locking mechanism without the need to make precise adjustments to the length of the grabbing mechanism according to the core tool design and on-site operating conditions, thus reducing the probability of errors in the pressure-holding core transfer process. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the present invention; Figure 2 This is a schematic diagram of the base; Figure 3 A diagram illustrating how to retrieve a spearhead; Figure 4 This is a schematic diagram before the core was transferred. Figure 5 This is a schematic diagram of core transfer.

[0012] In the diagram: 1-Base, 2-Adjusting inner cavity, 3-Clamping claw, 4-Spring element, 5-Unlocking pipe, 6-Spearhead, 7-Limiting plate, 8-Clamping groove, 9-Hydraulic cylinder, 10-Pull rod, 11-Connecting section, 12-Detection section, 13-Transfer section, 14-Core, 15-Pressure-holding coring tool, 16-Heat-insulating and pressure-holding device, 17-Locking mechanism. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings.

[0014] like Figures 1-5 As shown, the present invention includes a base 1 and a spearhead 6. The tail end of the base 1 is adapted to the drive mechanism of the transfer system. An adjustment cavity 2 is provided at the axial center of the head end of the base 1. Multiple locking claws 3 are provided at equal intervals along the circumference of the inner wall of the head end of the adjustment cavity 2. The head end of the locking claws 3 is rotatably connected to the adjustment cavity 2. A spring element 4 is provided between the tail end of the locking claws 3 and the adjustment cavity 2. The tail end of the base 1 is coaxially fixed to the unlocking pipe 5. The tail end of the spearhead 6 is provided with multiple limiting discs 7 that are sequentially fixed along the axial direction. The multiple limiting discs 7 form a tower-like structure. The limiting discs 7 are adapted to the locking claws 3. The head end of the spearhead 6 is provided with a locking groove 8, which is adapted to the core 14.

[0015] To enable the base 1 and the spearhead 6 to move, the drive mechanism includes a hydraulic cylinder 9 and a pull rod 10. The hydraulic cylinder 9 drives the pull rod 10, and the head of the pull rod 10 is detachably connected to the base 1.

[0016] To achieve the experimental objective, the transfer system includes a connecting section 11, a detection section 12, and a transfer section 13 arranged from beginning to end. The connecting section 11 is adapted to a pressure-holding coring tool 15. The base 1 and the spearhead 6 slide within the transfer system. The transfer system includes a heat-insulating and pressure-holding device 16. The detection section 12 includes an MRI detection device and a CT scanning device.

[0017] To improve the success rate of unlocking, the inner wall of the 5th end of the unlocking pipe has a stepped hole structure.

[0018] In actual use, the base 1 is located inside the transfer section 13, the base 1 is connected to the tie rod 10, and the spearhead 6 is located inside the transfer section 13; The transfer section 13 is connected to the pressure-maintaining coring tool 15, and the retrieval spearhead 6 is fixedly connected to the core 14 through the locking groove 8; The drive mechanism moves to push the base 1 toward the core 14, the spearhead 6 is inserted into the adjusting cavity 2, the unlocking pipe 5 is placed around the core 14 and continues to move backward to insert into the locking mechanism 17 of the core 14 and the pressure-holding core extraction tool 15 to release the lock between the two, and the different limit plates 7 cooperate with the locking claws 3 to grasp the cores 14 of different specifications. The drive mechanism moves to pull the core 14 into the detection section 12, thus unlocking and gripping it.

[0019] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. An automated unlocking gripper device for oil and gas fidelity core transfer, characterized by: The device comprises a base (1), a spear head (6), the tail end of the base (1) is adapted to the driving mechanism of the transfer system, the head end of the base (1) is provided with an adjusting inner cavity (2), the inner wall of the head end of the adjusting inner cavity (2) is provided with multiple clamping claws (3) at equal intervals in the circumferential direction, the head end of the clamping claw (3) is rotationally connected to the adjusting inner cavity (2), the spring element (4) is arranged between the tail end of the clamping claw (3) and the adjusting inner cavity (2), the tail end of the base (1) is coaxially fixedly connected to the unlocking pipeline (5); The tail end of the spear head (6) is provided with multiple limiting discs (7) which are sequentially fixedly connected in the axial direction, the multiple limiting discs (7) form a tower structure, the limiting disc (7) is adapted to the clamping claw (3), the head end of the spear head (6) is provided with a clamping groove (8), and the clamping groove (8) is adapted to the core.

2. The gripping device of claim 1, wherein: The driving mechanism comprises a hydraulic cylinder (9) and a pull rod (10), the hydraulic cylinder (9) drives the pull rod (10), and the head end of the pull rod (10) is detachably connected to the base (1).

3. The gripping device of claim 1, wherein: The transfer system comprises a connecting section (11), a detection section (12) and a transfer section (13) arranged from the head end to the tail end, the connecting section (11) is adapted to the pressure-maintaining coring tool (15), and the base (1) and the spear head (6) slide in the transfer system.

4. The gripping device according to claim 3, characterized in that: The transfer system comprises a heat preservation and pressure maintaining device (16).

5. The gripping device of claim 3, wherein: The detection section (12) comprises a nuclear magnetic detection device and a CT scanning device.

6. The gripping device of claim 1, wherein: The inner wall of the head end of the unlocking pipeline (5) is a stepped hole structure.

7. The gripping device of claim 1, wherein: The base (1) has the same outer diameter as the unlocking pipeline (5).

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