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Bidirectional hydraulic oscillator

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

Active Publication Date: 2021-03-02
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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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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Abstract

The invention provides a bidirectional hydraulic oscillator. The bidirectional hydraulic oscillator comprises an outer sleeve containing a transmission short section, a first core shaft, a second coreshaft, a first resetting piece, a static valve, a movable valve and a second reset piece, wherein the first core shaft and the second core shaft are arranged outside the transmission short section ina sleeve mode, a hydraulic cavity is formed between the first core shaft and the second core shaft, the transmission short section is provided with a liquid inlet hole and a drainage hole which are connected to the hydraulic cavity, the first resetting piece is used for providing resetting force for a mandrel, the static valve is provided with a first through hole corresponding to the drainage hole, the movable valve is provided with a second through hole communicating with the liquid inlet hole, the second reset piece is used for providing reset force for the movable valve, at least part ofthe movable valve can be arranged in the transmission short section in a sliding and penetrating mode between the first position and the second position, when in the first position, the movable valveshields the position between the drainage hole and the first through hole, and when in the second position, the first through hole communicates with the drainage hole. The bidirectional hydraulic oscillator provided by the specification can generate reciprocating oscillation action in two directions, can greatly act on frictional resistance on a shaft bottom drill string, and improves the drillingefficiency.

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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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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