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Rock elastic parameter determination method based on while-drilling rock debris logging data

A determination method and cuttings technology are applied in the field of rock elastic parameter determination based on logging data of cuttings while drilling, which can solve the problems of high cost of rock coring, inaccurate calculation of rock mechanical parameters, lack of basic data, etc. The form and coefficient of the fitting equation are quite different, reducing the cost of coring operations, and solving the missing effect

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

[0006] The purpose of the present invention is to provide a method for determining rock elastic parameters based on cuttings logging data while drilling. The lack of basic data caused by factors such as incomplete well data and inaccurate calculation of rock mechanics parameters

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Embodiment Construction

[0030] The present invention is further described below:

[0031] The determination method of rock elastic parameters based on cuttings logging data while drilling:

[0032] 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.

[0033] The steps for obtaining the microscopic parameters of the three-dimensional digital rock core described in step 1 include:

[0034] 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;

[0035] 1.2. Using X-ray diffractometer to analyze the rock mineral composition of cuttings while drilling;

[0036] 1.3. Use the nuclear magnetic resonance imaging analyzer to obtain the porosity and density of cuttings whi...

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Abstract

The invention relates to a rock elastic parameter determination method based on while-drilling rock debris logging data. The method comprises the steps: 1, obtaining three-dimensional digital rock core microscopic parameters according to the while-drilling rock debris logging data to be logged; 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; and 4, selecting rock debris while drilling of different well depths of the to-be-measured well, and repeating the steps 1 to 3 to obtain the continuous rock elasticity modulus and Poisson's ratio of the to-be-measured well distributed along the well depths. According to the method, continuous rock elasticity modulus and Poisson's ratio distributed along the well depth can be obtained by analyzing while-drilling rock debris data along the well depth and carrying out numerical simulation, and the problem that basic data of whole-well rock mechanical calculation is missing can be effectively solved.

Description

Technical field: [0001] The invention relates to a rock physical property evaluation technology, in particular to a rock elastic parameter determination method based on cuttings logging data while drilling. Background technique: [0002] Rock elastic parameters are the most basic data for rock mechanics calculations, and are widely used in wellbore stability analysis, casing-cement sheath combination stress analysis, and hydraulic fracturing in petroleum engineering. Rock mechanics parameters include elastic modulus, Poisson's ratio, shear modulus and bulk modulus, the most important of which are elastic modulus and Poisson's ratio, shear modulus and bulk modulus can be calculated from these two parameters out. At present, there are usually two methods to obtain the elastic modulus and Poisson's ratio: one is to calculate the shear and compression wave velocity of the acoustic logging, and this evaluation method is called the dynamic method; the other is to carry out uniaxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N33/24
CPCG01N1/28G01N33/24
Inventor 冯福平韩旭张军呼布钦华浩杰毛广晟
Owner NORTHEAST GASOLINEEUM UNIV
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