Base device for hydraulic fracturing experiment

Abstract

The invention provides a base for a hydraulic fracturing experiment. The base comprises a base main body, an adapter bend, a dismounting column, a fracturing connector and a fracturing steel pipe. Thebase main body provides a flowing channel for a fracturing fluid and other parts of a fixing device, the adapter bend is used for connecting the high-pressure liquid and the base main body, the dismounting column is formed by connecting a left half part and a right half part through a bolt, and a hollow cavity allowing the fracturing steel pipe to penetrate through is defined in the center of thedismounting column. The fracturing steel pipe penetrates through the dismounting column, the upper end of the fracturing steel pipe extends out to be connected with a sample, and the fracturing connector is arranged at the lower portion of the fracturing steel pipe and is connected with the base main body to communicate the flowing channel with the fracturing steel pipe. According to the device,the base main body and the dismounting column are combined, the dismounting column fixes the sample in the fracturing process, after fracturing, the left half part and the right half part are separated, then the fracturing steel pipe is exposed, and the fracturing steel pipe and the base main body can be separated through a hand vise. The design is ingenious and reasonable, the rock sample can beeasily disassembled, the nondestructive operation can be achieved, the integrity of the sample is better kept, and the in-situ form of cracks is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of hydraulic fracturing, and in particular relates to equipment and device technology in hydraulic fracturing experiments. Background technique [0002] When doing indoor hydraulic fracturing experiments, the general method used is to drill a circular hole of a certain size in the center of a cylindrical or cubic rock specimen to prefabricate a wellbore, and use a fracturing steel pipe to simulate a vertical wellbore. At the same time, an open-hole section of a certain size needs to be reserved, which can simulate the initial fractures appearing in this well section during the fracturing process. A high-strength steel pipe is inserted into the round hole, and the gap between the steel pipe and the prefabricated wellbore is sealed with a high-strength adhesive. After fracturing, it is necessary to remove the rock specimen for further CT tomographic scanning to obtain the influence of the fracturing fracture ...

AI Technical Summary

Problems solved by technology

[0003] The above experimental method has the following problems: After the fracturing experiment is completed, the rock sample needs to be disassembled. During the disassembly process, because the bond between the sample and the steel pipe is usually a high-strength adhesive, it is difficult to disassemble the sample. , even if the sample can be disassembled, it is difficult to ensure the integrity of the sample, and the in-situ shape of the crack cannot be guaranteed

After the integrity of the sample is destroyed, if the CT scan is performed again, the experimental results will be inaccurate, which will lead to a decrease in the reliability of the experimental results.

[0004] At present, most fracturing experiments use the above method, which has a series of problems such as difficult operation, difficulty in ensuring the integrity of rock samples, and ensuring the in-situ shape of fractures.

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