Construction method of high position and large diameter directional drilling in complex roof
A technology of directional drilling and construction methods, applied in drilling equipment and methods, directional drilling, drill bits, etc., can solve the problems of increasing casing stiffness and casing weight, increasing casing running difficulty and increasing, etc. To achieve the effect of reducing the difficulty of lowering
Active Publication Date: 2021-04-30
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology
However, on the basis of the existing roof high-position directional drilling structure, the traditional casing running process has the following disadvantages: first, the inner diameter of the running casing must be larger than the diameter of the final hole of the drilling hole, and the reaming diameter of the casing hole section must also be larger than the casing Outer diameter, taking the high-position large-diameter directional drilling of Φ153mm roof as an example, the specification of the lowered steel casing is generally Φ178mm, and the reaming diameter of the casing hole section should not be less than Φ193mm. If the diameter of the final hole increases, the casing specification Corresponding to the increase of the reaming diameter, this will not only increase the workload of reaming, but also increase the stiffness and weight of the casing, increasing the difficulty of running the casing; secondly, in order to obtain the ideal hole wall stabilization effect , the lowering depth of the casing should theoretically pass through the weak fractured layer, and the deepest may cover the entire climbing hole section. Due to the overall curvature of the drilling track in this hole section, the difficulty of running large-diameter casings is further increased, and even cannot be lowered to the predetermined position. , leading to casing failure
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[0043] see figure 1 , shows a preferred embodiment of the high-position large-diameter directional drilling of the complex roof of the present invention, the complex top-plate high-position large-diameter directional drilling consists of casing hole section L 1 and main drainage hole section L 2 Composition, the main extraction hole section L 2 Arranged in the stable drainage layer IV, the casing hole section L 1 From the coal seam I along an inclination, it enters the roof II, the weak and broken layer III and the stable drainage layer IV in turn, and connects to the main drainage hole section L after the stable drainage layer IV bends 2 .
[0044] The casing hole section L 1 Into the protective wall casing 101, see also Figure 1A , the 101 inner diameter of the wall casing is d c1 , the outer diameter is d c2 , the casing hole segment L 1 The inner diameter is d K , the wall casing 101 and casing hole segment L 1 After the sealing material 102 is injected into the...
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A construction method for high-position and large-diameter directional drilling on complex roofs. Holes are drilled at a positive angle in the coal seam, and drilled into the pilot directional holes in the casing hole section, so that they pass through the roof and weak fractured layers to reach a stable drainage layer; The pilot directional hole of the pipe hole section is drilled to the bottom of the hole, and the wall casing is lowered from the hole to protect the hole section of the weak broken layer, and the sealing material is injected into the wall casing and the drilling wall annulus to seal the wall casing. Drill and measure the directional drilling tool assembly through the casing hole section, drill the pilot directional hole in the main drainage hole section along the design trajectory to the designed hole depth, exit the measurement while drilling directional drilling tool assembly, and drill the pilot directional drilling tool in the main drainage hole section Reaming is implemented on the basis, and the hole is terminated in the form of an open hole; thus, the present invention avoids the collapse of the weak and broken layer hole wall during the construction process of the main drainage hole section and the later drainage process, resulting in the difficulty of drilling and gas drainage. In addition, large-diameter reaming of the main drainage hole section through the casing hole section can be realized, and the gas drainage effect can be improved.
Description
technical field [0001] The invention relates to the technical field of coal mine tunnel drilling, in particular to a construction method for high-position and large-diameter directional drilling on complex roofs. Background technique [0002] Borehole drainage is an important way to control coal mine gas in my country at the present stage. Directional drilling with high position and large diameter on the roof is an important means to relieve the pressure of gas in the area affected by mining in the mining face. , It is of great significance to realize gas resource extraction and utilization. [0003] Roof high-level directional drilling is a group of strike-oriented long drilling holes constructed from the high-level directional drilling site opened along the backflow trough of the working face or adjacent to the roadway to the roof of the coal seam. High-concentration gas achieves the purpose of gas control in the working face. The structure of high-level directional drill...
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IPC IPC(8): E21B7/04E21B7/28E21B7/20E21B33/13E21B10/32
CPCE21B7/04E21B7/20E21B7/28E21B10/322E21B33/13
Inventor赵建国刘建林李泉新陈盼赵江鹏姜磊王四一
OwnerXIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP