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Locking jaw suspension type pressurized coring device

A hanging and locking claw technology, applied in the direction of extraction of undisturbed cores, earthwork drilling, etc., can solve the problems of inflexible unlocking, difficult pressure relief, unreliable hanging, etc., and achieve the effects of convenient unlocking, reasonable structure and reliable hanging.

Active Publication Date: 2016-09-07
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a locking pawl hanging pressurized coring device, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problems of unreliable suspension, inflexible unlocking and pressure relief in the existing pressurized coring tools. The problem

Method used

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  • Locking jaw suspension type pressurized coring device

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Embodiment Construction

[0014] The present invention is not limited by the following examples, and specific implementation methods can be determined according to the technical solutions of the present invention and actual conditions.

[0015] In the present invention, for the convenience of description, the description of the relative positional relationship of each component is based on the description attached to the description. figure 1 For example, the positional relationship of top, bottom, left, right, etc. is determined according to the layout direction of the drawings in the specification.

[0016] Below in conjunction with embodiment and accompanying drawing, the present invention will be further described:

[0017] as attached figure 1 , 2 As shown in , 3, the locking pawl suspension pressurized coring device includes an upper joint 1, a bearing seat 2, an outer cylinder 3, a drill bit 4, a sleeve 5, a shunt joint 7, a locking pawl sleeve 12, a locking pawl, and a guide sleeve Cylinder ...

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Abstract

The invention relates to the technical field of underground coring devices, in particular to a locking jaw suspension type pressurized coring device. The locking jaw suspension type pressurized coring device comprises an upper joint, a bearing base, an outer cylinder, a drill bit, a casing, a flow separating joint, a locking jaw casing, a locking jaw, a guide casing, a limiting sleeve, a bearing joint, an inner cylinder and a rock core jaw. The locking jaw suspension type pressurizing centering device has the advantages that the structure is reasonable and compact; after the coring is finished, the pressurizing is performed, the locking jaw is unlocked, the pressurizing sleeve, the guide sleeve, the limiting sleeve and a press sleeve continuously move down and push the bearing joint and the inner cylinder, the rock core jaw mounted at the lower end of the inner cylinder is forced to retract and deform, and the purpose of pressurized coring is realized; finally, a pressure relief ball is thrown in, a pin on the pressure relief sleeve is sheared off, a pressure relief hole in the casing is exposed, and drilling liquid can smoothly circulate; the suspension is more reliable, the unlocking is convenient, and the pressure relief is smooth; by throwing the corresponding ball, the coring drilling, core cutting and pressure relief are realized, so that the whole coring process is completed, and the construction is convenient and rapid.

Description

technical field [0001] The invention relates to the technical field of downhole coring devices, and relates to a locking pawl suspension pressurized coring device. Background technique [0002] At present, coring with pressurized coring tool is the most important means to improve the harvest rate of coring in soft formations. The pressurized coring tool is to disengage the inner core cylinder from the outer cylinder by means of mechanical pressure or hydraulic pressure. , and then the mechanical force or hydraulic pressure presses down the inner cylinder to force the clamp-type core claw (one grasp) installed at the lower end of the inner cylinder to shrink, resulting in permanent deformation, thereby cutting off the core, and dragging the core with the contracted core claw to prevent the drill from being lifted up Have time to lose heart. However, some pressurized coring tools have unreliable suspension, which causes the inner and outer cylinders to be disengaged in advanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B25/04
CPCE21B25/04
Inventor 王开华戴勇方明王战卫孟滢
Owner BC P INC CHINA NAT PETROLEUM CORP
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