Wellhead safe operation method based on axial oblique jet suction and drainage

Abstract

The present invention provides a wellhead safety operation method based on axial oblique jet suction and drainage, which adopts the wellhead safety operation system based on axial oblique jet suction and drainage to realize the suction of combustible gas at the wellhead. The system includes a sand discharge pipeline, an axial oblique injection suction drainage aid mechanism connecting the wellhead with the sand discharge pipeline, an ignition device, a gas injection unit and a first gas injection manifold; Provided to the oblique jet suction and drainage mechanism to form negative pressure suction; the ignition device is set at the outlet end of the sand discharge pipeline and ignites the combustible gas discharged from the sand discharge pipeline. The invention can realize dual-channel suction and a nitrogen injection suction method with adjustable gas injection, and eliminates the safety risk of natural gas overflowing the wellhead during open well operations such as "tripping and replacing rubber core" under the condition that a small amount of natural gas is produced from the formation , Significantly improve the safety of on-site operations, which is conducive to the advantages of gas drilling speed increase, and is suitable for the field of reverse circulation 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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