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Bidirectional Hydraulic Oscillator

A technology of hydraulic oscillator and mandrel, which is applied to vibration generating devices, wellbore/well components, earthwork drilling and production, etc., and can solve the problems of single reciprocating oscillation of bottom-hole oscillating tools and insufficient

Active Publication Date: 2021-11-26
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the pressure fluctuations produced by these existing methods can only act in a single direction, so that the bottom hole oscillation tool can only produce reciprocating oscillations in a single direction, which is not enough for the friction and drag reduction effect of the drill string

Method used

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  • Bidirectional Hydraulic Oscillator
  • Bidirectional Hydraulic Oscillator
  • Bidirectional Hydraulic Oscillator

Examples

Experimental program
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Embodiment Construction

[0047] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope. After reading the present invention, those skilled in the art will understand the present invention Modifications of various equivalent forms fall within the scope defined in the present application.

[0048] It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions are for the purpose of illustration on...

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PUM

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Abstract

This specification provides a two-way hydraulic oscillator, including: an outer sleeve containing a transmission nipple; a first mandrel and a second mandrel sleeved outside the drive nipple, and the first mandrel and the second mandrel A hydraulic chamber is formed between them, and the transmission nipple has a liquid inlet hole and a discharge hole connected to the hydraulic chamber; a first reset member that provides a reset force for the mandrel; a static valve with a first through hole corresponding to the discharge hole ; a movable valve with a second through hole communicating with the liquid inlet hole; a second reset member providing a reset force for the movable valve; at least part of the movable valve can slide through the transmission between the first position and the second position In the pup joint, when it is at the first position, the movable valve is blocked between the discharge hole and the first through hole, and when it is at the second position, the first through hole communicates with the discharge hole. The two-way hydraulic oscillator provided in this manual can generate reciprocating oscillations in two directions, which can greatly act on the frictional resistance on the drill string at the bottom of the hole and improve drilling efficiency.

Description

technical field [0001] The application relates to the technical field of petroleum and natural gas engineering, in particular to a two-way hydraulic oscillator. Background technique [0002] With the development of oil and gas resources, the number of wells with complex structures such as horizontal wells and extended-reach wells is increasing. Compared with conventional vertical wells, these well types have a larger well inclination angle, and the wellbore extends horizontally for a long distance in the oil layer, which can increase the contact area with the oil and gas layers, so it becomes the best choice for improving the productivity and recovery of oil wells. important means. [0003] The pipe strings in horizontal wells and extended-reach wells are usually in an eccentric state under the action of their own weight, and are easy to stick to the bottom of the wellbore, increasing the downward resistance of the pipe strings, resulting in the inability to transmit the dr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B28/00E21B31/00E21B31/113
CPCE21B28/00E21B31/005E21B31/113
Inventor 柳贡慧汪伟李军查春青陈添连威
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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