Wellhead combustible gas safe operation method based on adjustable annular suction discharge aiding

Abstract

The invention provides a wellhead combustible gas safe operation method based on adjustable annular suction discharge aiding. A wellhead safe operation system based on adjustable annular suction discharge aiding is used for achieving a suction effect on wellhead combustible gas. The system comprises a sand discharging pipeline, an adjustable annular suction discharge aiding mechanism, an ignitiondevice, a gas injection unit and a first gas injection manifold, wherein the adjustable annular suction discharge aiding mechanism connects a wellhead with the sand discharging pipeline; inert gas generated by the gas injection unit is provided for the suction discharge aiding mechanism by the first gas injection manifold so as to form a negative pressure suction effect; and the ignition device isarranged at the outlet end of the sand discharging pipeline and ignites the combustible gas discharged from the sand discharging pipeline. The wellhead combustible gas safe operation method based onthe adjustable annular suction discharge aiding has the advantages that a dual-passage suction and gas injection adjustable and controllable nitrogen gas injection suction method can be realized; thesafety risk of natural gas overflowing from the wellhead during open well operation such as trip operation and rubber core replacement performed under the condition of production of a small amount ofnatural gas from the stratum is eliminated; the field operation safety is obviously improved; the gas drilling speed acceleration advantage realization is facilitated; and the method is applicable tothe field of counterflush drilling.

Description

technical field [0001] The invention relates to the field of drilling (drilling) engineering technology, in particular to a safe operation method for sucking combustible gas at the wellhead by using an inert gas (for example, nitrogen), which can be used in the technical field of oil and gas drilling, and is also 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 (≤10000m 3 / d), the circulating medium is converted to inert gas nitrogen to avoid...

AI Technical Summary

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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