Gas drilling wall building device

Abstract

The invention provides a gas drilling wall building device. The gas drilling wall building device comprises a compressor, a fusible material tank and a drill rod; a double-channel connector is arranged at the top of the drill rod, and the bottom of the drill rod is located in a wellhead device; the double-channel connector is provided with a fusible material channel and a gas channel; a center pipeline is arranged in the fusible material channel; a lower connector is arranged in the gas channel, and a power generation device and a drill bit are sequentially arranged at the bottom of the drill rod; and the drill bit comprises a drill bit body, a drill bit inner body is arranged in the drill bit body, a heating cavity, an inlet nozzle and an outlet nozzle are arranged in the drill bit inner body, and an annular heater is arranged in the heating cavity. In the gas drilling process, a layer of fusible material hard shell can be formed on the well wall of the wellhead device, the fusible material hard shell has certain strength, the purposes of preventing stratum water outflow and keeping the well wall stable are achieved, the safety of the drilling process is improved, stratum water can be blocked while drilling is conducted, drill pulling and drill stopping are avoided, and the well building period is shortened.

Description

technical field [0001] The invention relates to the technical field of drilling devices, in particular to a gas drilling wall-building device. Background technique [0002] As an underbalanced drilling method, gas drilling has many advantages, such as protecting the reservoir, increasing the ROP, prolonging the service life of the drill bit, preventing lost circulation, and reducing environmental pollution. It has been developed rapidly in recent years. [0003] However, there are still some problems in the actual gas drilling construction process, mainly manifested in two aspects: formation water discharge and well wall instability. Water out of the formation can lead to the shrinkage of the borehole or the collapse of the borehole wall. At the same time, the returning cuttings on the annular space are easy to gather and form agglomerates when they encounter water, which affects the purification effect of the borehole and seriously causes accidents such as channel blockage ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned problems in the prior art, the present invention provides a gas drilling wall-building device, which solves the problem that during the gas drilling construction process, formation water emerges, which causes the returning rock cuttings on the annular space to easily gather and form agglomerates when encountering water, resulting in passage Problems with plugging, stuck pipe and wellbore instability

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