Technology for determining coal bed intensity by using coal ash

A strength and coal seam technology, applied in the direction of wellbore/well components, earth cube drilling and mining, etc., can solve the problems of coal seam coring difficulty in coal bed methane drilling, unsuitable for coal seam drilling strength prediction, etc., and achieve good application effect

Inactive Publication Date: 2011-06-22
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

At present, the prediction of coal seam strength at home and abroad is mostly about the strength prediction after the artificial geological conditions of coal mine r

Method used

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  • Technology for determining coal bed intensity by using coal ash
  • Technology for determining coal bed intensity by using coal ash
  • Technology for determining coal bed intensity by using coal ash

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Embodiment Construction

[0027] The method for determining coal seam strength with coal ash proposed by the present invention is described as follows in conjunction with accompanying drawings and examples.

[0028] Due to the particularity of the coal seam structure, the development of various cracks in the coal rock leads to its mechanical properties: discontinuity, heterogeneity, anisotropy and permeability, which make the mechanical strength of the coal seam low, and the cracks and cleats are developed. The homogeneity is poor, drilling and coring is difficult, and it is difficult to process standard test coal cores after the cores are subjected to stress release, mechanical disturbance, and water loss. The results of the indoor strength test are seriously distorted.

[0029] At present, the prediction of coal seam strength at home and abroad is mostly based on the strength prediction after the artificial geological conditions of coal mine roadway wall cracks. However, it is difficult to take cores...

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Abstract

The invention relates to a technology for determining coal bed intensity by using coal ash, which is suitable for the technical field of well wall stabilization in well drilling for coal bed methane. The method comprises the following steps of: classifying, cleaning, baking and crushing coal rock debris obtained by logging, performing proximate analysis of coal according to the national standard, and determining the ratio of ash to volatile; judging the coal grade of the coal rock according to the volatile value; selecting the corresponding empirical formula of the relationship between the ash and the intensity according to the coal grade and calculating the intensity of coal rock blocks; and solving the coal reservoir intensity by combining a geological strength index (GSI) value and applying a Hoek-Brown rock mass strength empirical formula. The method is provided by combining the field on the basis of the Hoek-Brown rock mass strength empirical formula, and is suitable for the requirement for acquiring the parameters of the coal bed intensity in the well wall stabilization prediction of well drilling for the coal bed methane, and the prediction method is simple and has a good effect.

Description

technical field [0001] The invention relates to the technical field of well wall stability in coalbed methane drilling, in particular to the technology for determining coalbed methane reservoir strength with coal ash. Background technique [0002] Coal is an extremely heterogeneous organic rock transformed from plant remains. Usually there are two groups of nearly vertical cleats in the coal rock. resulting cracking. The surface cleats in the main fracture group are relatively well developed, extending up to hundreds of meters, and the end cleat group develops between the surface cleats, communicating the surface cleats. In addition to cleats, coal seams often develop cracks such as joints and secondary joints. These fractures intersect and cut each other, forming a complex fracture system. Due to the action of cleats and joint fissures, the coal body is cut into discontinuous small pieces approximately rhombohedral, which destroys the integrity of the coal seam. [0003...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 邓金根孙清华申瑞臣田中兰杨恒林蔚宝华谭强宋立辉
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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