A hydraulic double-acting shock and rotary impactor inside a pdc drill bit

A double-acting, drill-bit technology, which is applied in the field of rotary impactors and hydraulic double-acting impact rotary impactors, can solve the problems of large impact force loss and weakening impact effects, etc., and achieves less impact force loss, long service life and high efficiency. high effect

Active Publication Date: 2020-12-25
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the more effective way is to use hydraulic tools to generate continuous circumferential percussion, but due to the distance from the drill bit, the impact force loss is relatively large, which weakens the impact effect

Method used

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  • A hydraulic double-acting shock and rotary impactor inside a pdc drill bit
  • A hydraulic double-acting shock and rotary impactor inside a pdc drill bit
  • A hydraulic double-acting shock and rotary impactor inside a pdc drill bit

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Embodiment Construction

[0022] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings; the following embodiments are illustrative, not restrictive, and the protection scope of the present invention cannot be limited by the following embodiments.

[0023] A hydraulic double-action shock rotary device inside a PDC drill bit, which is composed of a telescopic sub-joint and a shock actuator. 4, the lower end of the telescopic short joint is coaxially connected with the shock actuator in the drill bit.

[0024] The structure of the telescopic short joint is: see figure 1 , 2 , 3. Consists of outer cylinder 2, inner cylinder 3 and ejector rod 5. The upper end of the outer cylinder is made into a tapered inner screw to be threadedly connected to the lower end of the drill collar. The inner cylinder is coaxially slid to install the inner cylinder. The inner cylinder It is a hexagonal or octagonal prism structure, which is guided up and down in...

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Abstract

The invention relates to a hydraulic double-action jarring rotary impactor in a PDC (polycrystalline diamond compact) drill bit, which comprises an extension nipple and a jarring execution mechanism,wherein the upper end of the extension nipple is coaxially and fixedly mounted at the lower end of a drill collar; the jarring execution mechanism is coaxially mounted in the drill bit; and the lowerend of the extension nipple is coaxially connected with the jarring execution mechanism in the drill bit. According to the hydraulic double-action jarring rotary impactor, the extension nipple is added between the drill collar and the drill bit; an anvil is arranged in the drill bit; a knocking head arranged on a circumferential tangent line of a discoid disk body achieves circumferential knockingfor the drill bit; a circumferential knocking point is closer to bit teeth; a generated impact force is larger; a loss of the impact force is less; a discoid knocking hammer drops to the lowest pointof a spiral oblique surface by the action of an elastic force of a spring; a central shaft column achieves axial impact in the drill bit; the circumferential knocking and axial impact have a combinedaction; and the efficiency is higher.

Description

technical field [0001] The invention belongs to the field of petroleum drilling engineering, and relates to a rotary impactor for crushing rocks in an oil well, in particular to a hydraulic double-action shock rotary impactor inside a PDC drill bit. Background technique [0002] PDC drills are one of the most commonly used drill types today. Due to the "slip-slip" phenomenon of the drill bit teeth in the process of shearing and breaking rocks, the efficiency of rock breaking is greatly reduced. At present, the more effective way is to use hydraulic tools to generate continuous circumferential percussion, but because it is far away from the drill bit, its impact force loss is relatively large, which weakens the impact effect. [0003] Through the search of the published patent documents, the following two published patent documents were found: [0004] 1. A tilt-stabilizing hydraulic swivel (CN201896583U), which belongs to the technical field of oil field operation equipmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B28/00E21B17/07
CPCE21B17/07E21B28/00
Inventor 卢渊伊向艺李沁吴元琴
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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