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Experimental method for fracture reorientation rule in oriented perforating and fracturing process

An experimental method and directional perforation technology, applied in the field of hydraulic fracturing, can solve the problems of large differences and affect the reliability of the test, and achieve the effect of high test reliability and accurate and reliable test results

Active Publication Date: 2012-11-14
PETROCHINA CO LTD
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Problems solved by technology

[0005] The present invention provides an experimental method for directional perforation and fracturing fracture diversion research to solve the problem that the existing experimental cement casting test is quite different from the test under real rock core conditions, which affects the reliability of the test

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  • Experimental method for fracture reorientation rule in oriented perforating and fracturing process
  • Experimental method for fracture reorientation rule in oriented perforating and fracturing process
  • Experimental method for fracture reorientation rule in oriented perforating and fracturing process

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specific Embodiment approach

[0032] The present invention proposes an experimental method for research on directional perforation and fracturing fracture diversion. The experimental method includes:

[0033] A cube with a side length greater than or equal to 1m is used as a test piece and the test piece is made, and then under the condition of triaxial (three axes or three directions perpendicular to each other) stress loading, directional perforation and fracturing are carried out successively, and then The specimens were dissected to study the relationship between perforation direction and fracture orientation. The core outcrop is collected from the mine, and after mining, it is cut into cubes, the surface is trimmed, and the surface accuracy is controlled. The core outcrop cube greater than or equal to 1m is mainly to consider the radius and distance of fracturing fracture turning. Usually, the radius and distance of fracturing fracture turning are more than 0.5m. If the test piece is too small, it is ...

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Abstract

The invention provides an experimental method for researching the fracture reorientation in the oriented perforating and fracturing process. The experimental method comprises the following steps of: A, making a test piece by a core exposure cube of which the side edge is greater than or equal to 1m; B, then arranging the test piece in a three-axis stress loading device and sequentially carrying out oriented perforating and fracturing on the test piece under the three-axis stress loading condition; and C, after carrying out fracturing, analyzing the test piece. The experimental method provided by the invention has a more reliable test result and is convenient to observe a fracture extension rule.

Description

technical field [0001] The present invention relates to the field of petroleum exploitation, in particular, to hydraulic fracturing technology, a method for studying the law of directional perforation and fracturing fracture steering in rocks under a three-dimensional stress state, that is, the research method of directional perforation and fracturing fracture steering experimental method. Background technique [0002] At present, the main steps of the experimental method for studying directional perforation and fracturing fracture diversion are as follows: 1. Casting cement specimen (0.3m cube), pre-buried iron pipe and paper roll to replace wellbore and perforation section respectively before casting; 2. .Put the test piece into the loader, pressurize in three directions through three hydraulic jacks, and simulate the three-dimensional stress in the formation state; 3. Use a high-pressure pump to inject high pressure into the test piece, and press open the test piece to fo...

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Application Information

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IPC IPC(8): G01N33/24
Inventor 唐梅荣赵振峰李宪文樊凤玲刘顺王文雄马兵王广涛曹宗熊徐创超
Owner PETROCHINA CO LTD
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