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A technology of coalbed methane and coal seam, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., and can solve the problems of stable and high production of coalbed methane
Inactive Publication Date: 2015-02-04
郝占元
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Problems solved by technology
[0006] In order to solve the problem that the existing coalbed methane mining technology cannot obtain stable and high yield of coalbed methane, the present invention provides a method for mining coalbed methane
Method used
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Embodiment 1
[0082] A method for mining coalbed methane includes the following steps:
[0083] a. Design the construction plan, drill a vertical well 100 from the ground to the bottom of the coal seam, and then drill several horizontal holes 200 in multiple layers from the inner wall of the vertical well within the thickness of the coal seam. All the horizontal holes 200 distributed in multiple layers are in the axial space After interlacing, a radial shape with the vertical well 100 as the center is formed; the vertical well 100 and the horizontal hole 200 are filled with active water; figure 2 Shown.
[0084] In specific implementation, the WITSUN model of fully enclosed radial well equipment uses high-pressure jet radial horizontal drilling, magnetic positioning + natural gamma logging to determine the casing window depth, and a gyro inclinometer to determine the casing window position. Then, a milling drill bit is used to make a hole on the casing of the target layer, and then a high-press...
Embodiment 2
[0090] The difference between this embodiment and Embodiment 1 is that step c is omitted.
Embodiment 3
[0092] The difference between this embodiment and Embodiment 1 lies in that step b is omitted.
[0093] The design of multi-pulse seam making parameters is as follows:
[0094] 1. Design basis: The peak pressure is between the fracture pressure of the coal seam and the compressive strength of the casing. The design peak pressure of multi-pulse composite joint making is 30MPa.
[0095] 2. Assumptions: The propellant is burned in a confined space; all the generated gas enters the formation through the perforation; the mixed gas conforms to the ideal gas state equation;
[0096] 3. According to the gas state correction equation:
[0097] (A) M1=(μπPHR 2 Set) / (KRT);
[0098] M1: The amount of propellant used to establish the pressure of the initial fractured coal seam, that is, the internal type I and II agent (kg);
[0099] P: Design peak pressure;
[0100] H: Design pressure relief section in the casing;
[0101] R sleeve: inner radius of sleeve;
[0102] K: Gas production volume of the medic...
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Abstract
The invention relates to a drilling and exploiting technology, in particular to a method for exploiting coal bed gas, and aims to solve the problem that stable yield and high yield of coal bed gas cannot be realized by using the conventional coal bed gas exploiting technology. The method for exploiting coal bed gas comprises the following steps: a, drilling a vertical well from the ground to the bottom of a coal bed, drilling a plurality of horizontal holes in a plurality of layers by taking the inner wall of the vertical well in the thickness of the coal bed as a starting point, wherein all the horizontal holes distributed in the plurality of layers are formed radially by taking the vertical well as the center after being staggered in an axial space; the vertical well and the horizontal holes are fully filled with water; b, crack making: putting a combustion device filled with a solid propellant into the vertical well, generating a large amount of high-temperature and high-pressure gas by using rapid combustion of the solid propellant, transmitting pressure and impacting the coal bed through water, and forming three-dimensional netlike irregular cracks on the coal bed; c, injecting a chlorine dioxide blocking remover into the horizontal holes; d, exploiting the coal bed gas from the well mouth of the vertical well on the ground. The method is reasonable in design, and the exploitation quantity of the coal bed gas is increased.
Description
Technical field [0001] The invention relates to coalbed methane mining technology, in particular to a method for mining coalbed methane. Background technique [0002] The main component of coalbed methane is methane (CH 4 ), is a kind of clean energy gas associated with coal, of which about 90% is adsorbed on the surface of the pores and cracks of the coal matrix in an adsorbed state, and about 10% is free in the pores and cracks in a free state. my country's coalbed methane resources are about 36.8 trillion m 3 , Ranking third in the world, equivalent to my country’s natural gas reserves. However, compared with developed countries, my country's CBM storage conditions have the characteristics of low saturation, low permeability, and low reservoir pressure. Therefore, its development is a worldwide problem, and it is difficult to directly introduce foreign technologies. [0003] my country’s CBM “Twelfth Five-Year Plan” proposes that “fracturing is a key technology for CBM developm...
Claims
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