Underbalanced drilling rock breaking simulation experiment device and simulation experiment method

Abstract

The invention relates to an under-balanced drilling rock-breaking simulation experimental device and method. The under-balanced drilling rock-breaking simulation experimental device comprises a frame, a rotating system, a blowout prevention system, a high-pressure autoclave and a data collection and recording system; the top end of the high-pressure autoclave is provided with an active rotating assembly of the blowout prevention system; a sealing rubber core is arranged in the active rotating assembly; the top end of the high-pressure autoclave is closed to form a drilling fluid hydraulic chamber through the active rotating assembly which is provided with the sealing rubber core; a drill pipe penetrates the middle of the sealing rubber core to extend into the high-pressure autoclave; an annular horizontal load hydraulic chamber is formed in the high-pressure autoclave; the horizontal load hydraulic chamber surrounds outside a core gripper; a formation pressure hydraulic chamber is supported below the core gripper; the horizontal load hydraulic chamber and the formation pressure hydraulic chamber are located on a lifting supporting plate; the upper end of a plunger is connected with the lifting supporting plate; the lower end of the plunger is connected with a drilling simulation hydraulic chamber; the plunger is provided with a displacement sensor. According to the under-balanced drilling rock-breaking simulation experimental device and method, the movement condition that the rotating rock-breaking operation is performed through a drill bit under the underground conditions of under-balanced drilling is truly simulated and the indoor experiment support is provided for under-balanced drilling rock-breaking mechanism research.

Description

technical field [0001] The invention relates to an underbalanced drilling technology, in particular to an underbalanced drilling rock breaking simulation experiment device and a simulation experiment method thereof. Background technique [0002] Underbalanced drilling refers to a drilling method in which the drilling fluid column pressure at the bottom of the well is lower than the formation pressure during drilling, allowing the formation fluid to enter the wellbore and circulate out of the well in a controlled manner. Underbalanced drilling is beneficial to identify, evaluate, discover and protect oil and gas reservoirs, especially for low-permeability and unconventional reservoirs; Bottomhole holding effect is beneficial to the removal of bottomhole cuttings and the crushing of rock by the drill bit, which can greatly increase the mechanical penetration rate, reduce the wear of the drill bit and prolong the service life of the drill bit, thereby shortening the drilling cy...

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to provide underbalanced drilling rock breaking simulation experiment device, this kind of underbalanced drilling rock breaking simulation experiment device is used to solve the problem that current underbalanced drilling rock breaking simulation experiment can not be realized, another purpose of the present invention is to provide this A method for performing simulation experiments with an underbalanced drilling rock breaking simulation experiment device

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