Three-dimensional vibration hydraulic oscillator and machining method

Abstract

The invention provides a three-dimensional vibration hydraulic oscillator and a machining method, and relates to the field of petroleum and gas downhole tools. The three-dimensional vibration hydraulic oscillator comprises a pipe body, wherein an eccentric turbine is arranged in the pipe body, a sliding sleeve connection structure capable of rotating relatively is formed between the outer wall of the eccentric turbine and the inner wall of the pipe body, an inclined hole penetrating in the axial direction is formed in a turbine body of the eccentric turbine, an included angle is formed between the inclined hole and the axis of the pipe body, an inner sleeve is arranged on the inner wall of the inclined hole, and turbine blades are fixedly arranged in the inner sleeve; and a fixed valve block is further arranged in the pipe body and located on the downstream of the eccentric turbine, the eccentric turbine makes contact with the fixed valve block, and an overflowing hole penetrating in the axial direction of the pipe body is formed in the fixed valve block and is an eccentric hole. During machining, a turbine blade assembly is fixedly arranged in the inner sleeve firstly; then the inclined hole is machined in the turbine body; then the inner sleeve is fixedly arranged in the inclined hole; and machining of the eccentric turbine is completed through the above steps. According to the three-dimensional vibration hydraulic oscillator and the machining method, composite vibration can be generated, and the problem of downhole backing pressure is solved.

Description

technical field [0001] The invention relates to the field of oil and gas downhole tools, in particular to a three-dimensional vibration hydraulic oscillator and a processing method. 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 hydraulic oscillator is used in the prior art to change the static friction of the drilling tool 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 static plate changes periodically to generate vi...

AI Technical Summary

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.

However, the various schemes in the existing technology have the problems of complex structure and high processing cost. As the length of the well increases, the existing tools are difficult to fully meet the construction needs.

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