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Magnetic triggering multidirectional pressure maintaining coring device with simple structure and rock sample extraction method

A simple structure, magnetic technology, applied in the direction of extracting the undisturbed core device, earthwork drilling and mining, etc., can solve the problems of complex structure of the coring device, to prevent circumferential displacement, avoid axial displacement, and ensure pressure-holding performance Effect

Pending Publication Date: 2022-01-21
SHENZHEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The setting of the trigger mechanism makes the structure of the coring device complicated

Method used

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  • Magnetic triggering multidirectional pressure maintaining coring device with simple structure and rock sample extraction method
  • Magnetic triggering multidirectional pressure maintaining coring device with simple structure and rock sample extraction method
  • Magnetic triggering multidirectional pressure maintaining coring device with simple structure and rock sample extraction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as Figure 1-Figure 5 As shown, the magnetically triggered multi-directional pressure-maintaining coring device disclosed in this embodiment includes a core barrel 1, an outer barrel 2, a flap valve 3, an inner rod 5, a core catcher 6 and a core drilling tool. The core device 6 is arranged inside the lower end of the core barrel 1 .

[0039] The flap valve 3 includes a valve seat 31 and a sealing disc 32. The valve seat 31 is coaxially installed on the inner wall of the outer cylinder 2. A first sealing ring is provided between the outer wall of the valve seat 31 and the inner wall of the outer cylinder 2. The outer circumference of the flap valve 3 The slot is equipped with a second seal ring 7 .

[0040] One end of the sealing disc 32 is movably connected with the upper end of the valve seat 31 . Optionally, the valve seat 31 can be rotatably connected with the sealing disc 32 through a pin shaft.

[0041] A first magnetic piece 41 is installed on the sealing ...

Embodiment 2

[0055] In this embodiment, at least one limiting protrusion 311 is provided on the outer wall of the valve seat 31 . The limiting protrusion 311 is integrally manufactured with the valve seat 31 . The quantity of the limiting protrusions 311 is reasonably set according to needs, and it is preferable to arrange at least two limiting protrusions 311 at equal intervals along the circumferential direction of the valve seat 31 .

[0056] It is worth noting that the top surface of the limiting protrusion 311 is lower than the first sealing ring on the valve seat 31 .

[0057] The outer cylinder 2 includes an upper outer cylinder 21 and a lower outer cylinder 22 . The inner wall of the upper outer cylinder 21 has a limit groove 211 adapted to the limit protrusion 311. Taking the two symmetrically disposed limit protrusions 311 on the outer wall of the valve seat 31 as an example, the inner wall of the upper outer cylinder 21 has two symmetrically disposed Limiting groove 211.

[00...

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Abstract

The invention relates to a magnetic triggering multidirectional pressure maintaining coring device with a simple structure and a rock sample extraction method. The magnetic triggering multidirectional pressure maintaining coring device comprises a rock core barrel, an outer barrel and a flap valve; the flap valve comprises a valve seat and a sealing valve clack, the valve seat is coaxially installed in the outer barrel, a first magnetic piece is installed on the sealing valve clack, the valve seat is provided with a second magnetic piece used for attracting the first magnetic piece, and the outer cylinder is provided with a third magnetic piece used for generating repulsive force on the first magnetic piece; and no triggering mechanism is arranged in the magnetic triggering multidirectional pressure maintaining coring device. According to the magnetic triggering multidirectional pressure maintaining coring device, closing is triggered through magnetic force, initial sealing is reliable, the triggering mechanism is omitted, and the structure of the coring device is simplified; the closed magnetic field loop is formed by the three tile-shaped magnets magnetized in the radial direction, the action area between the first magnetic piece and the second magnetic piece is large after the sealing valve clack is closed, and therefore larger attraction force is achieved; and meanwhile, larger initial sealing force can be formed, so that reliable extrusion sealing is formed between the sealing valve clack and the valve seat.

Description

technical field [0001] The invention relates to the technical field of deep pressure-holding sampling, in particular to a magnetically triggered multi-directional pressure-holding coring device and a rock sample extraction method with a simple structure. Background technique [0002] Pressure-holding coring refers to a coring technique that maintains or approaches the formation pressure. By keeping the rock sample in the original stress environment, precious samples under the in-situ stress environment can be obtained. Further, in-situ parameters in rock samples can be quantitatively analyzed, such as oil-water saturation, in-situ gas pressure and other important data. Therefore, pressure-holding coring is one of the important science and technology to realize the precise development and utilization of deep energy. Among them, an important part to realize the pressure maintenance is the pressure maintenance controller, through which the downhole automatic closing of the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B25/00
CPCE21B25/00
Inventor 高明忠刘贵康谢和平陈领李聪李佳南游镇西黄伟叶帮华史晓军何志强
Owner SHENZHEN UNIV
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