Mud retaining wall and air down-the-hole hammer drilling tool and drilling technology

Abstract

The invention relates to a mud retaining wall and air down-the-hole hammer drilling tool and a drilling technology. The drilling tool is in a coaxial three-channel structure; an inner layer drilling rod is provided with a center channel; the inner layer drilling rod and a middle layer drilling rod form a second channel; the middle layer drilling rod and an outer layer drilling rod form a third channel; the three-channel drilling tool in the drilling process and a hole wall form a fourth channel for independent circulation of mud and compressed air; an outer pipe of the drilling tool adopts threaded connection; two layers of inner pipes are spliced; the connection strength is high; the sealing property is good; screwing and dismounting are facilitated. The compressed air drives a down-the-hole hammer to impact detritus, so that the hard rock drilling efficiency can be improved by more than ten times; the compressed air is closed and cycled in down-the-hole equipment and free from the influence of variations of well depth and confining pressure; the wind pressure and air supply are reduced greatly; the well mouth contamination is prevented; the energy-saving, environment-friendly and low-cost drilling is achieved; the mud drilling is used while the air drilling is used; the effective protection on the well wall is achieved; the adaptability to various complex formations is improved; and the drilling safety is ensured.

Description

Technical field: [0001] The invention relates to a coaxial three-channel drilling tool and a drilling process for the exploration and development of oil and gas resources, geothermal drilling and hydrological water well drilling, especially the simultaneous operation of mud circulation wall protection and air down-the-hole hammer drilling. Background technique: [0002] In oil and gas resource exploration and development, geothermal drilling and hydrological water wells and other medium-caliber drilling projects, when conventional drilling methods are used to drill hard rock formations, the drilling efficiency drops sharply, resulting in increased drilling costs and extended drilling construction periods. Technical problems that need to be solved urgently in the drilling industry. In recent years, in order to greatly improve the drilling efficiency, the research and application of air DTH hammer drilling technology have been carried out at home and abroad. The application pr...

AI Technical Summary

Problems solved by technology

As a result, air compressors and superchargers have large investment, high energy consumption, large floor space, and serious environmental pollution, and it is impossible to use effective mud flushing and wall protection technology

When the formation conditions are complex, the water volume in the well is large, and the wellbore stability is poor, the air drilling method is difficult to apply and implement, which limits the application and promotion of the air DTH drilling technology

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