Rock brittleness evaluation method based on while-drilling rock debris logging data

A technology of rock brittleness and evaluation method, which is applied in soil material testing, material inspection products, preparation of test samples, etc., can solve the problem of limited number of rock cores, inaccurate brittleness evaluation results, and inability to obtain continuous rock brittleness evaluation results and other problems, to achieve the effect of reducing the cost of coring operations and accurate evaluation results of reservoir rock brittleness

Active Publication Date: 2021-07-20
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

[0008] The purpose of the present invention is to provide a rock brittleness evaluation method based on cuttings logging data while drilling. Inaccurate brittleness ...

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  • Rock brittleness evaluation method based on while-drilling rock debris logging data
  • Rock brittleness evaluation method based on while-drilling rock debris logging data
  • Rock brittleness evaluation method based on while-drilling rock debris logging data

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Embodiment Construction

[0043] The present invention is further described below:

[0044] This rock brittleness evaluation method based on cuttings logging data while drilling:

[0045] Step 1. Obtain the microscopic parameters of the three-dimensional digital core according to the drilling cuttings logging data of the well to be logged, which are rock mineral components and content, porosity, microscopic contact stiffness, and microscopic elastic modulus.

[0046] The steps for obtaining the microscopic parameters of the three-dimensional digital rock core described in step 1 include:

[0047] 1.1. Select cuttings while drilling of wells to be logged, clean and dry them, grind and sieve them, and use them to prepare rock powder with a particle size of about 10 μm;

[0048] 1.2. Using X-ray diffractometer to analyze the rock mineral composition of cuttings while drilling;

[0049] 1.3. Use the nuclear magnetic resonance imaging analyzer to obtain the porosity and density of cuttings while drilling;...

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Abstract

The invention relates to a rock brittleness evaluation method based on while-drilling debris logging data. The rock brittleness evaluation method comprises the steps: 1, obtaining three-dimensional digital rock core microscopic parameters according to the while-drilling debris logging data of a to-be-logged well; 2, generating a three-dimensional digital rock core sample according to the obtained microscopic parameters of the rock debris while drilling; 3, carrying out a uniaxial or triaxial compression numerical experiment on the three-dimensional digital rock core sample to obtain a three-dimensional digital rock core stress-strain curve, and calculating the elastic modulus and Poisson's ratio of the rock core; 4, calculating a normalized elastic modulus, a poisson ratio and a brittle mineral proportion; 5, calculating and obtaining a brittleness index comprehensively considering rock mineral components and mechanical properties; and 6, selecting rock debris while drilling of different well depths of the to-be-measured well, repeating the steps 1 to 5, and calculating to obtain the rock brittleness index of the reservoir section distributed continuously along the well depth. According to the method, coring operation is not needed, the influence of brittle mineral composition and rock elastic parameters on the brittleness is comprehensively considered, and the reservoir rock brittleness evaluation result is more accurate.

Description

Technical field: [0001] The present invention relates to reservoir rock brittleness evaluation technology, in particular to a rock brittleness evaluation method based on cuttings logging data while drilling. Background technique: [0002] Tight reservoirs have the characteristics of low porosity and low permeability. Fracturing must be used for stimulation to achieve profitable development. The fracturing effect is affected by the brittleness of the rock. The more brittle the rock, the more complex the fractures formed after high pressure, and the effect of fracturing stimulation. the better. Therefore, when designing hydraulic fracturing, the well section with high rock brittleness should be selected first for fracturing, so as to improve the effect of fracturing. [0003] The existing rock brittleness evaluation methods are mainly based on rock mineral composition and mechanical experiments, and different rock brittleness evaluation methods and standards are given. The mo...

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Application Information

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IPC IPC(8): G01N1/28G01N33/24
CPCG01N1/28G01N33/24
Inventor 冯福平韩旭张军呼布钦缪传辉蒋忻飞
Owner NORTHEAST GASOLINEEUM UNIV
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