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TECHNICAL FEATURES OF A TRIAXIAL LOADING SETUP FOR HYDRAULIC FRACTURING OF LARGE-SCALE SPECIMENS
Abstract
In the process of hydraulic fracturing (HF), pressurized fluid is supplied to an isolated interval of the well. This causes the formation of an artificial crack, the growth direction of which greatly affects the method efficiency. It is especially important to take this into account when designing in-mine hydraulic fracturing for the solid minerals development. In this case HF is carried out close to underground workings and other inseam boreholes and these factors can influence the stress-strain state of stimulated rocks and fracturing fluid filtration. This results in complex fracture trajectories compared to conventional HF performed in oil and gas reservoirs. Laboratory studies of the crack growth process in rock samples under compression helps to improve the effectiveness of the method. In most studies, core testing machines with two independent directions of loading (axial and uniform compression) are used. Unfortunately, this does not fully correspond to reservoir conditions and does not allow considering specific mining problems. This paper presents the results of the development of the laboratory setup for hydraulic fracturing in large-scale cubic models (cube edge is 420 mm) with independent triaxial loading. A test chamber has a sectional design, which allows you to have an access to the specimen without mechanical impact after the end of the tests. The test chamber is in a power bundle with several square plates. The number, location and shape of the plates are optimized based on the results of stress-strain state analysis. Tests of the hydraulic circuit for model compression show that the maximum pressure reached on the side walls of the model around is 15 MPa.
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