Gas drilling decompression method

Abstract

The invention discloses a gas drilling decompression method. The method comprises the following steps of a, the monitoring step and b, the decompression step, wherein the monitoring step specifically comprises the sub-step that a monitoring system is used for monitoring a drilling machine in real time, and the decompression step specifically comprises the sub-step that a valve control module is used for controlling three valves to decompress the drilling machine; the three valves are the unit decompression valve, a gas supply valve and a stand pipe decompression valve; in the normal drilling process, the unit decompression valve and the stand pipe decompression valve are closed by the valve control module, and the gas supply valve is opened, high-pressure gas enters a drilling tool to conduct well digging operation; during joint breaking and drill pipe connection, the stand pipe decompression valve is opened firstly, when the opening degree of the stand pipe decompression valve exceeds 50%, the unit decompression valve is opened and the gas supply valve is closed at the same time. According to the gas drilling decompression method, a whole high-pressure network of a compressor and a supercharger is adjusted and made to start an inner cycle, high-pressure gas can be effectively saved, and the energy conservation purpose is achieved; and in addition, the valve control module is used for decompressing the drilling machine, and safety risks of personal can be effectively lowered.

Description

technical field [0001] The invention relates to the technical field of gas drilling, in particular to a pressure relief method for gas drilling. Background technique [0002] Gas drilling is an underbalanced drilling process that uses air or nitrogen as the circulating medium, uses gas compressors and other equipment as pressurization devices, and uses rotary blowout preventers as wellhead control equipment. It is used for oil and natural gas drilling. Among them, the control of compressed air or nitrogen is the key to the whole drilling process. [0003] Gas drilling has many advantages, such as: significantly increasing the ROP and shortening the drilling cycle; good cleaning and cooling conditions at the bottom of the well prolong the service life of the drill bit and save the amount of the drill bit; the use of the air hammer drill bit has low drilling pressure and low speed. The torque is small, and the anti-slant effect is better; it can effectively avoid the occurren...

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Problems solved by technology

[0006] The pressure relief valve device and its implementation method disclosed in this patent document are used in the uninterrupted circulation system of oil drilling. People and equipment cause harm. However, the biggest defect of the system is that it mainly relies on manual operation of high-pressure devices to discharge high-pressure gas and liquid during unloading and unloading of drill pipes, and personnel risks still exist; When lifting and unloading the drill pipe and breaking out, the high-pressure gas has no practical effect at this time, and it will cause a certain waste of high-pressure gas

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