Simulation reservoir gas drilling shaft obstruction-deplugging experiment apparatus

Abstract

The invention discloses a simulation reservoir gas drilling shaft obstruction-deplugging experiment apparatus. The apparatus comprises a simulation shaft system, a simulation shaft gas injection system, a simulation reservoir system, a data acquisition and electronic control system, wherein the simulation shaft gas injection system communicates with the bottom end of a simulation shaft, the simulation reservoir system communicates with the side edge of the overpressure resistant steel pipe (21) of the simulation shaft system, and the computer terminal (19) of the data acquisition and electronic control system acquires information of each pressure sensor, each flowmeter and each highs-speed camera (20) and controls the opening and closing of a solenoid valve A (16), a solenoid valve B (13) and a solenoid valve C (10) through a CAN bus (22). The apparatus provided by the invention has the following advantages: an underground pressure accumulation rule after a simulated reservoir gas drilling shaft is obstructed and a shaft gas-solid two-phase transient flow rule after obstruction is released accord with actual conditions, the representativeness is high, and the guidance significance for analyzing an underground safety risk mechanism is quite good.

Description

technical field [0001] The invention relates to the field of petroleum engineering drilling, in particular to a plugging-removing experimental device for simulating formation gas drilling wellbore. Background technique [0002] Gas drilling is widely used in the field of drilling speed increase because of its advantages of increasing mechanical penetration rate, overcoming lost circulation, and protecting reservoirs. In recent years, gas drilling has been gradually applied in the field of production layer drilling in China. Many wells have achieved high yields. At the same time, there have been many accidents such as internal blowout prevention tool damage, wellhead puncture leakage, and seal failure caused by drilling high-pressure production layers. pose serious security risks. At the moment when gas drilling unearths the production layer, due to the huge pressure difference at the bottom of the well, the formation gas is produced at a high speed, and at the same time, th...

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Problems solved by technology

At present, the law of bottomhole pressure accumulation and the gas-solid two-phase migration law after plugging removal in gas-producing wells are still unclear, which restricts the application of gas drilling technology

[0003] In the field of gas drilling, there is an urgent need to study the mechanism of wellbore plugging and plugging removal in gas-producing layer gas drilling, but there is no relevant experimental device at present

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