Lower oscillation sliding vane jet flow stroke-increasing hydraulic oscillator

Abstract

The invention provides a lower oscillation sliding vane jet flow stroke-increasing hydraulic oscillator. A vortex cavity is fixedly arranged in an outer sleeve and used for generating vibration; a flow inlet hole is formed in one end of the vortex cavity, and a flow outlet hole is formed in the other end of the vortex cavity and located in the circle center position of the vortex cavity; a slidinggroove is formed in one side of the flow outlet hole and internally provided with a movable sliding block sliding in the axial direction; and one end of the stroke of the movable sliding block partially covers the flow outlet hole, and the other end of the stroke of the movable sliding block completely leaves the flow outlet hole so as to alternately limit the through-flow section of the flow outlet hole. By the adoption of the scheme that the movable sliding block is arranged in the vortex cavity, the movable sliding block is driven by vibration of the vortex cavity to reciprocate, and therefore the through-flow area of a flow inlet channel is changed, the vibration amplitude of the vortex cavity is increased, the vibration frequency is reduced, and then the vibration form meeting the underground construction requirement is obtained, namely the proper amplitude and vibration frequency are obtained. According to the structure of the lower oscillation sliding vane jet flow stroke-increasing hydraulic oscillator, the number of movable components is small, the service life is long, the pressure loss of a drive component is extremely low, and the output efficiency is high.

Description

technical field [0001] The invention relates to the field of oil drilling and production equipment, in particular to a lower-oscillating sliding vane jet flow-extending hydraulic oscillator. Background technique [0002] At present, drilling in oil fields has developed from vertical wells to directional wells and horizontal wells. Drilling tools are usually close to the lower side well wall. The friction of drilling tools on the well wall is too large, which affects the drilling efficiency and makes it difficult to transmit the drilling pressure to the drill bit. In order to overcome this defect, a solution of a hydraulic oscillator has appeared in the prior art, through which the static friction of the drilling tool is changed into dynamic friction to reduce friction. Existing hydraulic oscillators generally have three structures. 1. Screw motor structure, which drives the rotor to rotate through the screw, so that the flow section of the hole between the rotor and the stat...

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Problems solved by technology

The problem is that the pressure loss of this solution is high, usually reaching 3~4 Mpa, and the service life is usually less than 500 hours, and the price of the screw motor is very high, such as the structure in Chinese patent document CN205778542U

2. The jet structure uses the vortex cavity to generate vibration and the periodic change of the pressure medium to generate high-frequency vibration, but the pressure loss of this scheme is only 0.2-0.3 Mpa, the frequency is high, and the frequency cannot be controlled

The problem with this solution is that the structure is relatively complex, there are too many rotating parts, the cost is high, the loss is high, and the turbine rotor rotates at a high speed, which makes the output frequency of the tool high, difficult to control, and has a short service life.

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