Inert gas suction well mouth combustible gas safety operation method

Abstract

The invention provides an inert gas suction well mouth combustible gas safety operation method. An inert gas suction well mouth combustible gas safety operation system is adopted to achieve a suctioneffect on well mouth combustible gas; the safety operation system comprises a sand discharge pipeline, a first suction short connector, an ignition device, a gas injecting unit and a first gas injecting pipe collector; a well mouth is connected with the sand discharge pipeline by the first suction short connector; the gas injecting unit generates inert gas; the inert gas is provided to the first suction short connector by the first gas injecting pipe collector to form a negative-pressure suction effect in the first suction short connector; and the combustible gas discharged from the sand discharge pipeline can be ignited by the ignition device. A nitrogen injecting suction method with double-channel suction and gas injection adjustment can be realized; the safety risk of natural gas overflowing from the well mouth in such well opening operations as tripping and rubber core replacement under the condition of discharging less natural gas from stratums is eliminated; the scene operationsafety is prominently improved; the acceleration advantage of a gas drilling well is facilitated; and the safety operation system is suitable for reverse circulation drilling.

Description

technical field [0001] The present invention relates to the field of drilling (drilling) engineering technical equipment, specifically, to a safe operation method for pumping combustible gas at the wellhead by using inert gas (for example, nitrogen), which can be mainly used in the technical field of oil and gas drilling, and is suitable for reverse circulation drilling field. Background technique [0002] In general, gas drilling technology has the advantages of speed increase, leakage control and reservoir protection. In recent years, it has been widely used in Sichuan-Chongqing, Xinjiang, Qinghai and other oil and gas blocks, and the speed of conventional drilling has been increased by more than 3 times compared with the same period of last year. It is more and more common to use gas drilling to increase the drilling speed in gas-bearing intervals with poor drillability. Once a small amount of natural gas is drilled in the formation (for example, 3 / d), the circulating m...

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Problems solved by technology

There are many deficiencies in this treatment method: ①It is a passive control measure, which cannot fundamentally prevent the natural gas from overflowing the wellhead, but can only blow away the overflowed natural gas through the exhaust fan; , Wellhead operators still need to directly face the natural gas that may overflow, which has great potential safety hazards, especially when performing knocking operations; 3 / d), often forced to terminate gas drilling operations early, which is not conducive to the advantage of speed increase

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