Complete equipment and process for nitrogen composite directional drilling

Abstract

The invention belongs to the technical field of coal bed gas development, and discloses complete equipment for nitrogen composite directional drilling. The complete equipment is used for nitrogen composite directional drilling of a broken and soft coal bed. The complete equipment comprises a nitrogen making machine, wherein the output end of the nitrogen making machine is connected with a rotatingtail through a nitrogen conveying pipeline, a main oil pump is used for atomizing lubricating oil and then injecting the lubricating oil into the nitrogen conveying pipeline, and the lubricating oilis injected into a drill hole along with nitrogen through the nitrogen conveying pipeline; one end of a spiral measurement-while-drilling drill rod is connected with a drilling machine, the other endof the spiral measurement-while-drilling drill rod is connected with one end of a pneumatic screw motor through a measurement-while-drilling device, and the other end of the pneumatic screw motor is connected with a drill bit; and an orifice fixing device is fixedly arranged at an orifice, a gas port is formed in the orifice fixing device, the gas port is connected with a negative pressure extraction pipeline through an orifice dust remover, and a wear-resistant gasket is further arranged between the spiral measurement-while-drilling drill rod and the orifice fixing device.

Description

technical field [0001] The invention relates to a complete set of equipment and technology for nitrogen composite directional drilling, belonging to the technical field of coal bed gas development. Background technique [0002] The use of boreholes to extract coal seam gas is a common and effective measure to prevent and control gas disasters and realize comprehensive management and utilization of gas. Due to the softness of the coal seam, spray holes, hole collapse and drill sticking are prone to occur in the process of hydraulic slag removal drilling in the coal seam, and the depth of the drilling holes in this coal seam is generally short and it is difficult to meet the design requirements. Using traditional rotary drilling technology for construction, the drilling trajectory is easy to enter the roof and floor due to natural deflection, and there are disadvantages such as shallow drilling depth, uncontrollable drilling trajectory, low drilling utilization rate and small ...

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Problems solved by technology

[0004] The present invention overcomes the deficiencies of the existing drilling equipment and technology. In order to solve the problem that the hole depth of the broken soft coal seam is generally short and the stability of the hole wall is poor, the phenomenon of

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