Composite oriented drilling equipment for coal mine underground complex stratum and application thereof

Abstract

The invention provides composite oriented drilling equipment for a coal mine underground complex stratum and application thereof. The composite oriented drilling equipment comprises a drilling tool, an oriented screw motor, a wireless electromagnetic wave while-drilling measuring system and a drill bit. The drill bit, the oriented screw motor, the wireless electromagnetic wave while-drilling measuring system, a normal drill stem and a water braid are connected in sequence in a screw-threading mode. Electromagnetic waves are used as a transmission medium, the depth of remote sensing is large, the transmission speed is high, the data transmission is reliable and effective, and adaptation to the underground drilling condition is high; the detected data in holes can be effectively transmittedby the normal drill stems and the stratum; compared with wired while-drilling measuring, the intensity of the drill stems is high, shearing strength and fatigue strength are better, manpower, materials and financial resources are saved; and the composite oriented drilling equipment for the coal mine underground complex stratum and the application thereof are a preferred mode and equipment for coalmine underground oriented drilling.

Description

technical field [0001] The invention relates to the field of underground tunnel drilling in coal mines, in particular to complex directional drilling equipment for complex underground strata in coal mines and an application thereof. Background technique [0002] Directional drilling technology originated in the field of oil and gas exploration and development. With the continuous development of drilling technology, this technology has gradually been introduced into new fields such as geological exploration and underground drilling in coal mines. Near-bit measurement-while-drilling directional drilling technology is a new technology in the field of coal mine drilling engineering. It is currently mainly used in coal mine gas drainage, water damage prevention and geological structure exploration and other drilling projects. In directional drilling construction, if the hole track dogleg (full angle change rate) is too large, it is easy to cause downhole accidents such as drill s...

AI Technical Summary

Problems solved by technology

[0014] 5. The degree of impact of WOB on combined steering force is not great

But this system has the following five disadvantages: first: the cost of processing copper cable drill pipe is high; second: the strength of the drill pipe is lower than that of ordinary drill pipe, which is easy to cause in-hole accidents such as broken drilling tools; third: due to the processing accuracy, Poor contact due to misoperation can easily lead to no signal or signal instability; fourth: due to technical complexity, it is not suitable for the construction of extended-reach directional wells, ultra-deep wells, and horizontal wells with ultra-long horizontal sections; fifth: copper cable drilling The structure of the rod is complicated, and the cost of later maintenance is high

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