A dual-channel supercritical carbon dioxide fracturing experimental device

Abstract

The invention discloses a dual-channel supercritical carbon dioxide fracturing experimental device, which relates to the technical field of oil and gas exploitation, and includes a test piece, a lifting mechanism, a limit mechanism and a liquid inlet adjustment mechanism. The upper end of the test piece is drilled with two Symmetrical prefabricated holes. The present invention can fasten test pieces of different specifications without rigid damage by placing the test pieces in the receiving groove of the limit mechanism; Prefabricated holes with deviations can also be accurately fractured; by setting the lifting mechanism, it is easy to load and unload; by setting the feeding mechanism and the lifting mechanism, and controlling the jet size of the supercritical carbon dioxide fracturing fluid by the control variable method, to observe the specimen By analyzing the crack situation and analyzing the difference, it is possible to obtain the specific influence of the jet size of the fracturing fluid on the experimental results, and it is directly implemented on a test piece, which can ensure that the experimental results obtained are more universal.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a dual-channel supercritical carbon dioxide fracturing experimental device. Background technique [0002] In recent years, international emerging low-permeability oil shale deposits have been developed through supercritical carbon dioxide fracturing. Supercritical carbon dioxide fracturing technology can effectively avoid the underlying damage, induced earthquakes and environmental pollution caused by hydraulic fracturing. Its advantages in fracture initiation pressure, communication of micro-fractures, and formation of complex fracture networks are a waterless fracturing technology with superior fracturing effects on granite, sandstone, shale, etc. [0003] However, due to the lack of theoretical and experimental research on supercritical carbon dioxide fracturing, especially in the process of using supercritical carbon dioxide in fracturing experiments, there i...

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Problems solved by technology

[0003] However, due to the lack of theoretical and experimental research on supercritical carbon dioxide fracturing, especially in the process of using supercritical carbon dioxide in fracturing experiments, there is no clear standard for the size of the jet flow of carbon dioxide, and the existing During the use of the experimental device, it was found that there were certain disadvantages: 1. The existing method of limiting the test piece often uses a cylinder to fix it, and the size of the stone material for the fracturing test test piece is relatively large, so there must be a certain size in the volume. difference, the stroke of the compression cylinder is fixed, and if the stone is crushed or not tightly pressed, it cannot completely imitate the real fracturing environment; The position is fixed, so it is necessary to re-drill holes for different test pieces, which is a waste of experimental time; 3. The test pieces are scattered after fracturing, and it is very difficult to take them out from the device after the experiment. 4. Usually, a feed pipe is used to carry out fracturing experiments on the prefabricated holes drilled on the specimens. Although the materials of the specimens are the same, there may be differences in the internal structure and density of different specimens. The experimental results are not rigorous, there are some differences

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