Gas drilling device and drilling method for dealing with formation water and stabilizing well wall

Abstract

The invention discloses a gas drilling device and method capable of treating formation water production and stabilizing a well wall and relates to the technical field of drilling devices using liquid with or without projectiles and gas spraying. The device comprises an adapter and a drill bit body, wherein a distributing channel and a metal filter film are arranged in the adapter, a central flow channel, a heating cavity, a melting cavity, a lateral nozzle and the like are arranged in the drill bit body, the distributing channel, the melting cavity and the lateral nozzle are sequentially communicated, and the outlet of the lateral nozzle is located in the lateral wall of the drill bit body. The heating cavity transmits heat to the melting cavity, fusible material micro-granules are heated and melted in the melting cavity and sprayed out from the lateral nozzle so as to form a layer of hard fusible-material shell on the well wall. The drilling device has the advantages that formation water blocking can be performed along with drilling, the pumping of fusible materials can be stopped after the water-producing formation is drilled through, well construction period can be shortened effectively, cost can be saved, and the device is widely applicable to gas drilling operations.

Description

technical field [0001] The invention relates to the technical field of a liquid or gas jet drilling device with or without entraining projectiles, in particular to a gas drilling device and a drilling method for treating formation water and stabilizing the well wall. Background technique [0002] my country's oil and gas exploration and development have shifted from good exploration and development conditions such as large integrated oil and gas fields and homogeneous sandstone with medium and high permeability to complex small and medium oil and gas fields, fault block oil and gas fields, low pressure, low permeability and low productivity, old oil field reconstruction, and complex reservoirs. Harsh exploration and development conditions, such as difficult-to-produce reserves and unconventional oil and gas, seriously restrict the efficient exploration and development process of oil and gas. As an underbalanced drilling method, gas drilling can effectively protect reservoirs ...

AI Technical Summary

Problems solved by technology

Water from the formation may lead to hydration and expansion of clay minerals in the open-hole section, resulting in borehole diameter shrinkage or borehole wall collapse; at the same time, the return cuttings on the annular space are easy to aggregate and form agglomerates after encountering water, affecting the wellbore purification effect, and even blockage in severe cases Downhole complex situations such as drill sticking induced by annular channels

2) Borehole wall instability

After drilling into a water-producing formation, it is necessary to re-drill and replace the drill bit for glue spraying. After the glue spraying is completed, it is still necessary to pull out the drill and replace the drill bit before drilling, which will increase the drilling time and affect economic benefits; enter the wellbore during the tripping process. formation water may cause downhole complications

[0005] To sum up, gas drilling technology has incomparable advantages in oil and gas exploration, but the problems of formation water production and wellbore stability restrict the further development of this technology. Solving formation water production and wellbore stability during gas drilling is an urgent need at present key issues to solve

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