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Calculation method of rock cumulative damage by pulsation fracturing

A technology of accumulative damage and pulsating pressure, applied in the direction of applying repeated force/pulsating force to test material strength, applying stable tension/pressure to test material strength, instruments, etc., can solve problems such as inapplicability, and achieve strong practicability, Ease of implementation, improved fracturing results

Active Publication Date: 2021-07-09
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

[0010] The purpose of the present invention is to provide a method for solving the cumulative damage of pulsating fracturing rocks. This method for solving the cumulative damage of pulsating fracturing rocks is used to solve the problem of inapplicability in different degrees when the method for characterizing the evolution law of rock damage in the prior art

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  • Calculation method of rock cumulative damage by pulsation fracturing
  • Calculation method of rock cumulative damage by pulsation fracturing
  • Calculation method of rock cumulative damage by pulsation fracturing

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing, the present invention will be further described:

[0028] The calculation method for the cumulative damage of the pulsating fracturing rock is as follows:

[0029] Step 1. Carry out on-site coring of rocks in the target fracturing well formation, prepare standard rock samples for cyclic load compression failure experiments, φ25*50mm or φ50*100mm cores, and carry out cyclic cyclic load compression failure experiments under a certain pulsation frequency and stress level ;

[0030] The stress-strain hysteresis loop curve (such as figure 1 shown) and the dissipative energy and elastic energy under each hysteresis loop (such as figure 2 shown), figure 2 is the schematic diagram of dissipative energy and elastic energy under a single hysteresis loop, where OA is the loading curve, AB is the unloading curve, the size of the area OAB is the dissipation energy under the hysteresis loop, and the size of the area BAC is the The...

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Abstract

The present invention relates to a method for solving the cumulative damage of pulsating fracturing rocks, which includes step 1, obtaining the stress-strain hysteresis loop curve of pulsating fracturing rocks, and then obtaining the stress-strain hysteresis loop curves of pulsating fracturing rocks at a certain pulsation frequency and stress level Dissipative energy and elastic energy; Step 2: Establish a calculation model describing rock damage evolution during pulsation fracturing; Step 3: Apply the rock stress-strain hysteresis loop at a certain pulsation frequency and stress level in the target fracturing block obtained in Step 1 The dissipative energy and elastic energy of the curve are substituted into the calculation model in step 2 to obtain the rock cumulative damage variable; step 4, repeat steps 1 to 3 to obtain the rock cumulative damage variable under different pulsation frequencies and stress levels in the target fracturing block ; Step five, analyzing the law of rock damage evolution in the target fracturing block under different pulsation frequencies and stress levels. The invention can provide a technical basis for the actual pulsating fracturing construction design of the target fracturing block.

Description

Technical field: [0001] The invention relates to a characterization method for rock damage evolution in pulsation fracturing, in particular to a method for solving cumulative damage of pulsation fracturing rock. Background technique: [0002] Pulse fracturing is a new technology for the development of unconventional oil and gas resources. The core of this technology is to apply periodically changing pulsating pressure. Under the action of repeated loading and unloading of the disturbance stress, fatigue damage and destruction of the rock will occur. On the one hand, the strength of the rock will decrease. On the other hand, when the disturbance stress reaches the corresponding strength limit of the rock, the rock will break and form cracks, thereby increasing reservoir stimulation. Volume, increase oil and gas production. [0003] Rock can be regarded as a heterogeneous multiphase composite structure, and there are a large number of natural defects, and the distribution of ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/32
CPCG01N3/08G01N3/32G01N2203/0005G01N2203/0019G01N2203/0075G01N2203/0085G01N2203/0087G01N2203/0212G01N2203/0256
Inventor 李玉伟彭根博王娟解志梅范家伟张海翔
Owner NORTHEAST GASOLINEEUM UNIV