Bottom Hole Drilling Fluid Pressure Oscillation Modulator

Abstract

The invention belongs to the field of petroleum engineering and particularly relates to a well bottom drilling fluid pressure oscillation regulator. The well bottom drilling fluid pressure oscillation regulator comprises an oscillation mother shaft, a countercurrent shell and a lower joint. The oscillation mother shaft is installed inside the countercurrent shell, a switch connection buckle of the oscillation mother shaft stretches out of the bottom end face of the countercurrent shell, and the oscillation mother shaft can rotate but cannot axially slide inside the countercurrent shell. Seal assemblies are installed in seal grooves of a countercurrent shell centering round surface, an anti-push bearing is installed between a countercurrent shell press-resistant annular surface and an annular plane located between the inner surface of a countercurrent cavity of the oscillation mother shaft and an outer annular surface of the upper portion of the oscillation mother shaft, and a sliding bearing is arranged between a centering surface of the lower portion of the oscillation mother shaft and a sliding bearing mounting hole of the lower end of a supporting surface of the lower portion of the countercurrent shell. The lower joint is installed on the switch connection buckle stretching out of the bottom end face of the countercurrent shell. A countercurrent flow channel of the countercurrent shell is provided with a countercurrent spray nozzle close to the borehole annulus end. By means of the well bottom drilling fluid pressure oscillation regulator, the purpose that the well bottom is impacted by negative pressure and pulse jet flow instantly is realized while a power drill rotor drives a drill bit to rotate at high speed.

Description

technical field [0001] The invention belongs to the field of petroleum engineering, and in particular relates to a downhole drilling fluid pressure oscillation modulator used in conjunction with a power drilling tool, which is used to realize that the power drilling tool drives the drill bit to rotate at a high speed to break the rock during drilling construction, and at the same time, the power The drilling fluid injected at constant pressure is modulated to alternately inject into the annulus and the bottom of the well, so as to increase the drilling speed. Background technique [0002] Research and field practice have shown that in the process of oil and gas drilling, instantaneous negative pressure and pulse impact at the bottom of the well can reduce the compression effect of cuttings and improve the efficiency of rock breaking and cleaning. The research also shows that the rock-clearing efficiency and speed-up effect increase with the increase of the drilling fluid neg...

AI Technical Summary

Problems solved by technology

However, these tools are difficult to meet the needs of power drilling tools, because during the drilling process, especially in the process of drilling directional wells, it is not appropriate to connect too long downhole tools between the power drilling tools and the drill bit, which requires the drilling fluid pressure used for directional well drilling The vibration modulation tool needs to have the following characteristics: (1) installed between the drill bit and the power drilling tool, its length should not be too long; (2) the working of the tool should not affect the use of the measurement while drilling tool; (3) the service life of the tool should not be too short , which is at least similar to the life of power drilling tools and drill bits; (4) when the tool has an accident, it cannot cause downhole accidents; (5) the use of the tool cannot provide a burden for the rotation of the power drilling tool

Some of the pulse jet tools that have been designed at home and abroad have complex structures and short working life, which are difficult to meet the needs of the site; The above types of drilling fluid pressure oscillation modulation tools have not been applied in the field of directional well speed increase

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