Cyclone generator

Abstract

The invention discloses a cyclone generator which is mainly composed of a center shaft, a one-way valve, an outer shell, a rotor, a stator and a flow guide body. An annular groove is formed in the periphery of the center shaft; a bypass hole is formed in the upper portion of the center shaft; a flow drainage hole is formed in the lower portion of the center shaft; the outer shell wraps the annulargroove of the center shaft and is in rotating fit with the center shaft; an annular driving cavity is formed between the outer shell and the center shaft; the upper portion and the lower portion of the annular driving cavity are communicated with the bypass hole and the flow drainage hole respectively; the one-way valve is arranged in the bypass hole; the rotor and the stator are arranged in theannular driving cavity formed between the outer shell and the center shaft; the rotor is fixed to the inner wall of the outer shell; the stator is fixed to the outer wall of the center shaft; and theflow guide body is arranged on the outer surface of the outer shell. The cyclone generator can completely meet the well cementation process requirements of complex structure wells of domestic verticalwells, directional wells and horizontal wells, and is a novel tool which is simple in structure, convenient to operate, low in cost, safe and reliable.

Description

technical field [0001] The invention relates to a downhole tool in the fields of oil and gas drilling, coal bed methane drilling, geological exploration, mine drilling, etc., in particular to a swirl generator. Background technique [0002] After the drilling and completion operation is completed, in order to ensure the stability of the wellbore and the safety and smoothness of subsequent construction operations, casings must be run in the wellbore, and cement should be injected into the annular space between the casing and the well wall. After the cement solidifies, a stable wellbore is formed. During the cementing process, when the casing is run into the wellbore, the cement slurry is injected from the casing mouth, and returns from the bottom of the casing to enter the annular space between the casing and the well wall. With the continuous injection of the cement slurry, the cement The slurry displaces the drilling fluid in the annulus out of the wellbore. The traditiona...

AI Technical Summary

Problems solved by technology

During the cementing process, when the casing is run into the wellbore, the cement slurry is injected from the casing mouth, and returns from the bottom of the casing to enter the annular space between the casing and the well wall. With the continuous injection of the cement slurry, the cement The slurry displaces the drilling fluid in the annulus out of the wellbore. The traditional method is one-dimensional axial flow displacement. The disadvantages of the conventional method are: (1) The flow velocity in the annulus near the wellbore wall is low, and the drilling fluid has a high viscosity. Adhesion, high adhesion requires high flow rate displacement, high flow rate displacement must require high energy consumption, and high energy consumption is limited by pump pressure and formation pressure bearing capacity; (2) The wellbore is irregular, the wellbore is jagged and uneven Conventional one-dimensional axial flow can easily cause drilling fluid backflow, resulting in drilling fluid retention; (3) The lower casing string is often difficult to replace due to insufficient displacement

[0005] The second is to use the swirl centralizer, although it is easy to use and has low risk, but the swirl energy is small, the length of the wellbore that can produce the swirl effect is short, and the ability to replace the drilling fluid is limited

Images