Experiment method for evaluation of fluid capacity for rock fracture forming

An experimental method and technology of ability, which is applied in the field of evaluating the fracture-making ability of fluids to rocks, and can solve the problem of ignoring the size of the fracture-making ability of fluids to rocks.

Active Publication Date: 2018-10-12
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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Problems solved by technology

[0003] At present, the methods for evaluating rock compressibility are mainly evaluated by brittleness. It is believed that the stronger the brittleness, the stronger the compressibility. However, the current method ignores the ability of fluid to create fractures in rocks

Method used

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  • Experiment method for evaluation of fluid capacity for rock fracture forming
  • Experiment method for evaluation of fluid capacity for rock fracture forming
  • Experiment method for evaluation of fluid capacity for rock fracture forming

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specific Embodiment

[0099] Specific examples, such as figure 1 Shown:

[0100] The experimental method for evaluating the ability of different fluids to create fractures in rocks. The core comes from a tight sandstone in an oilfield. The specific process is as follows:

[0101] Step 1: Put the standard cylindrical core into a constant temperature drying box, and dry it continuously for 24 hours at a constant temperature of 100 degrees Celsius to remove the liquid in the core;

[0102] Step 2: test the height h, diameter d and quality m of the dry core, and calculate the density ρ of the dry core by formula (1);

[0103] Step 3: Test the longitudinal wave and shear wave of the dry core along the axial direction, and calculate its dynamic elastic modulus E according to formulas (2) and (3). d and dynamic Poisson's ratio ν s size;

[0104] Step 4: Convert the dynamic rock mechanics parameters obtained in Step 3 into static rock mechanics parameters, the conversion formula is: E s =0.85E d and ...

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Abstract

The present invention discloses an experiment method for evaluation of fluid capacity for rock fracture forming. The method comprises the following steps of: testing brittleness coefficients, wave velocity-stress sensitivity coefficients, sound emission event numbers and natural fracture densities of a drying rock and a wet rock, performing nondimensionalization of the relative change values of the parameters, establishing fracture forming capacity index mathematic model of the different fluids for the rock, performing calculation and performing comparison. The experiment method for evaluationof fluid capacity for rock fracture forming is suitable for unconventional resources such as shale gas, coal bed gas, compact oil gas and hot dry rock, can be applied to the conventional oil-gas reservoir with low permeability and ultra-low permeability, can rapidly obtain the fracture forming capacity index of the different fluids for the rock, can evaluate the fracture forming capacity index ofthe same fluid for different rock samples and can conveniently guide hydraulic fracturing construction to optimize fracturing fluid to promote the formation of the manual complex fracture net in thefracturing process.

Description

technical field [0001] The invention relates to an oil and gas exploitation technology, in particular to an experimental method for evaluating the ability of fluid to create fractures on rocks. Background technique [0002] Hydraulic fracturing technology is an important means to increase the production of unconventional reservoirs such as shale gas and tight oil and gas, and it is also one of the effective ways to improve thermal energy recovery of hot dry rock. During the hydraulic fracturing process, a large amount of fluid (fracturing fluid) is injected into the formation, and the fluid can significantly change the mechanical properties of the rock. Therefore, the impact of the fluid on the fracture-forming ability (or compressibility) of the rock cannot be ignored. [0003] At present, the methods for evaluating rock compressibility are mainly evaluated by brittleness. It is believed that the stronger the brittleness, the stronger the compressibility. However, the curr...

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Application Information

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IPC IPC(8): G01M10/00
CPCG01M10/00
Inventor 汪道兵王小琼葛洪魁宇波孙东亮韩东旭刘庆马海燕周珺
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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