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Logging quantitative evaluation method of coal bed methane reservoir fracturing capability

A quantitative evaluation, coalbed methane technology, applied in the direction of earthwork drilling, wellbore/well components, etc., can solve quantitative evaluation of coalbed methane reservoir fracturing, low mechanical strength, fracturing effect and other problems

Inactive Publication Date: 2015-01-28
XIAN UNIV OF SCI & TECH
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Problems solved by technology

Due to the brittleness, fragility, low mechanical strength, well-developed cleats, and strong heterogeneity of coal lithology, the accuracy of the existing brittleness index method for evaluating the fracturing of coalbed methane reservoirs is greatly reduced
Secondly, the difference coefficient of the horizontal principal stress of the coal seam and the stress difference between the coal seam and the roof and floor will all have different degrees of influence on the fracturing effect
Judging from the existing methods, there is no method to quantitatively evaluate the fracturing of coalbed methane reservoirs by using well logging data, which brings inconvenience to the selection of fracturing layers in coalbed methane reservoirs

Method used

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  • Logging quantitative evaluation method of coal bed methane reservoir fracturing capability
  • Logging quantitative evaluation method of coal bed methane reservoir fracturing capability
  • Logging quantitative evaluation method of coal bed methane reservoir fracturing capability

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Embodiment 1

[0039] refer to figure 1 A logging quantitative evaluation method for fracturing of a coalbed methane reservoir comprises the following steps:

[0040] step one:

[0041] Determination of coal-rock brittleness index: coal-rock brittleness is an important indicator of coalbed methane reservoir compressibility. The higher the brittleness index, the easier it is to fracture the reservoir, and the easier it is to form network fractures; the lower the index, the stronger the plasticity of the reservoir, and the easier it is to form double-wing fractures.

[0042] The mechanical parameters of coal and rock play an important role and influence on the compressibility of coal seam. Poisson's ratio reflects the fracture ability of coal and rock under stress, and elastic modulus reflects the support ability of coal and rock after fracture. The higher the elastic modulus and the lower the Poisson's ratio, the stronger the brittleness of coal rock.

[0043] Accordingly, formulas (1) to ...

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Abstract

The invention relates a logging quantitative evaluation method of coal bed methane reservoir fracturing capability. The method has the advantages that coal rock brittleness index, coal bed horizontal main stress difference coefficient, and the minimum main stress difference of the coal bed and between the top plate and the bottom plate of the coal bed are determined by using logging information, the coal bed methane reservoir fracturing capability is evaluated according to the three evaluation indexes, logging quantitative evaluation precision of the coal bed methane reservoir fracturing capability is increased while logging technical support is provided for coal bed methane reservoir fracturing layer optimization, and the method is simple and practical.

Description

technical field [0001] The invention relates to the technical field of well logging evaluation in coalbed methane exploration and development, in particular to a logging quantitative evaluation method for the fracturing of coalbed methane reservoirs. Background technique [0002] In the process of coalbed methane development, fracturing drainage and depressurization are often used to obtain industrial gas flow, and the fracturing evaluation of coal seams has become an important task in the selection of favorable coalbed methane reservoirs and the formulation of fracturing schemes. Well logging data contain abundant coal bed physical information, so it is necessary to use well logging information to evaluate the fracturing of coalbed methane reservoirs. [0003] As of the deadline, to evaluate the fracturability of the rock formation from the perspective of well logging, mainly use the logging data to calculate the Young's modulus and Poisson's ratio of the rock formation, an...

Claims

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 汤小燕
Owner XIAN UNIV OF SCI & TECH