Near-horizontal pressurized directional drilling equipment and method for complex fractured formations in underground coal mines
A directional drilling and directional drilling technology, applied in drilling equipment and methods, directional drilling, drilling equipment and other directions, can solve the problems of high safety risk, easy instability and damage of the hole wall, low porosity, etc., to improve the control accuracy, The effect of improving the stability of the hole wall and improving the anti-blocking ability
Active Publication Date: 2022-03-01
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology
[0006] The purpose of the present invention is to provide a near-horizontal pressurization method for complex and broken strata in coal mines in order to solve the technical problems of easy instability and damage of the hole wall, low porosity rate, and high safety risk in the construction of near-horizontal drilling in complex and broken strata in underground coal mines. Directional drilling equipment and method
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[0052] see figure 1 , figure 2 , the near-horizontal pressurized directional drilling equipment for complex broken formations in underground coal mines of the present invention includes a flushing fluid circulation system 1, an orifice sealing system 2, a throttling pressurization system 3, a contaminated flushing fluid treatment system 4, and a directional drilling tool assembly 5 and monitoring control system6.
[0053] The flushing liquid circulation system 1 is composed of flushing liquid tank 7, butterfly valve 8, filter 9, flushing liquid pump 10, liquid supply flow measurement device 11, liquid supply pressure measurement device 12, flow channel switching valve 13, and is used to provide drilling The high-pressure flushing liquid that enters and pressurizes the hole wall, and the output flow of the flushing liquid pump 10 should be steplessly adjustable.
[0054] The orifice sealing system 2 is composed of an annular sealing device 14, a ram BOP A15, a sealing tee 16...
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The invention relates to an underground coal mine tunnel drilling method, in particular to a near-horizontal pressurized directional drilling equipment and method for complex and broken formations underground in a coal mine. It includes: an orifice casing, which is used to close the orifice during construction; a directional drilling tool assembly, which passes through the orifice casing to enter the coal seam during construction, and is provided with a unidirectional drill tool center hole; throttling a pressurization system, connected to the first fluid channel formed between the directional drilling tool assembly and the orifice casing, and capable of recovering and inputting fluid from the first fluid channel; the present invention provides High-pressure flushing fluid, and the pressure of the flushing fluid is controlled, so that the radial additional support force of the flushing fluid on the hole wall is greater than the equilibrium pressure value of the hole wall, ensuring the stability of the drilling hole and avoiding the instability and damage of the drilling hole in complex and broken strata, and safety accidents High-incidence problems improve the hole formation rate and construction safety of various near-level geological exploration and disaster prevention drilling in underground coal mines.
Description
technical field [0001] The invention relates to an underground coal mine tunnel drilling method, in particular to a near-horizontal pressurized directional drilling equipment and method for complex and broken formations underground in a coal mine. Background technique [0002] Restricted by my country's energy resource endowment of "rich in coal, poor in oil, and low in gas", coal has long been the main energy source and basic industry in China. [0003] Coal mine underground drilling engineering is an important technical means for coal mine geological exploration, disaster prevention and emergency rescue. It is widely used in the fields of mine gas drainage, water disaster prevention and geological anomaly detection. The annual drilling engineering volume is nearly 1 billion linear meters. Mine safety assurance capabilities have played a positive role. [0004] However, my country’s coal is mainly mined by underground methods, and various types of boreholes in coal mines a...
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IPC IPC(8): E21B7/04E21B10/61E21B21/00E21B21/08E21B33/06
CPCE21B7/046E21B21/00E21B21/08E21B33/06E21B10/602E21B10/61
Inventor 方俊李泉新刘桂芹褚志伟刘建林王彦清李乐
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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