A Coalbed Methane Reservoir Improvement Method with Mylonitic Coal Developed on the Floor
A technology of reservoir reconstruction and mylonite coal, which is applied in the field of coalbed methane mining, can solve the problems of limited cavitation capacity and unsatisfactory gas production effect, and achieve the effect of small particle size and improved coalbed methane production
Active Publication Date: 2019-09-06
PETROCHINA CO LTD
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Problems solved by technology
Although hydraulic slotting and cavitation technology solves the problems existing in hydraulic sand fracturing, its cavitation ability is limited, and it does not form a large pressure relief area and seepage channel in the middle coal seam, especially for mylonitic coal on the floor. Reservoir, gas production effect is not ideal
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[0036] In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art.
[0037] In order to make the technical solution of the embodiment of the present invention clearer, before describing the transformation method provided by the embodiment of the present invention, firstly, a brief introduction is made to the structure of the coalbed methane reservoir with mylonitic coal on the floor.
[0038] join figure 1 , see also figure 2 , the coalbed methane reservoirs with mylonitic coal in the bottom plate are as follows from bottom to top: floor surrounding rock 14, mylonitic coal seam 15, original structure coal seam 16, and roof surrounding rock 17, among w...
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The invention discloses a coalbed gas reservoir reforming method of bottom plate developing mylonite coal, and belongs to the technical field of coalbed gas mining. The reforming method comprises the following steps that a, according to the coalbed total thickness and the mylonite coalbed thickness in a coalbed gas reservoir of the bottom plate developing mylonite coal, the position of a hole-making operation layer section and the position of a hydraulic sand fracturing operation layer section are determined; b, hole-making operation is conducted on the hole-making operation layer section, and a pressure relief space of the preset size is formed in the hole-making operation layer section; c, the bottom of a coalbed gas well and the pressure relief space are washed, and coal dust of the bottom of the coalbed gas well and the pressure relief space is discharged; and d, hydraulic sand fracturing operation is conducted on the hydraulic sand fracturing operation layer section, so that a coalbed collapses to form a crack channel. By means of the reforming method, the production rate of coalbed gas of the coalbed gas reservoir of the bottom plate developing mylonite coal can be improved remarkably.
Description
technical field [0001] The invention relates to the technical field of coal bed methane exploitation, in particular to a method for reforming a coal bed methane reservoir in which mylonitic coal is developed on the floor. Background technique [0002] Coal bed methane, commonly known as "gas", is a kind of unconventional natural gas formed and stored in coal seams during the coal formation process. In the mining process of coalbed methane, it is necessary to reform the coalbed methane reservoir to make coal seam cracks to increase the output of coalbed methane. Mylonitic coal is a tectonic coal with a very broken coal structure and extremely low permeability. Due to the particularity of the coal structure, for coalbed methane reservoirs with mylonitic coal on the floor, it is necessary to choose an appropriate transformation method to improve Its coal bed methane production is particularly important. [0003] At present, the methods for improving vertical coalbed methane w...
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IPC IPC(8): E21B43/00E21B43/267
Inventor 陈文文杨延辉杨艳磊陈龙伟张永平曲凤娇邵国良王乔张晨李静雯唐新毅
Owner PETROCHINA CO LTD