Water sealing device based on hydraulic fracturing experiment under high temperature and high pressure

Abstract

The invention discloses a water sealing device applied to hydraulic fracture experiment under high-temperature and high-pressure condition. The water sealing device comprises a hole sealing nut, a metal water pipe, a locking nut, metal washers and wedge-shaped sealing red copper rings, wherein the wedge-shaped sealing red copper rings sleeve the metal water pipe which extends into drill hole inside a rock sample, are partitioned by the metal washers, and each wedge-shaped sealing red copper ring is formed by oppositely buckling two copper seals with slopes; the inner surface and the outer surface of each wedge-shaped sealing red copper ring are vertical surfaces; the wedge-shaped sealing red copper rings expand in a tester under the condition that the maximum temperature can reach 600 DEG C; the inner vertical surfaces and the outer vertical surfaces are used for pressing the metal water pipe and rock hole wall respectively, so that the initial hole sealing is implemented; the wedge-shaped sealing red copper rings are pressed and deformed to expand in the process of applying load to the rock sample by the tester; the outer vertical surfaces are on close contact with the hole wall of the rock sample; the inner vertical surface is in close contact with the metal water pipe, so that the high-pressure water sealing in the experiment process is implemented. According to the water sealing device, the wedge-shaped sealing red copper rings are additionally arranged outside the metal water pipe, so that the water sealing under the high-temperature, high-load and high-pressure condition is realized; the device is simple in structure, reliable in performance and high in stability, and is applied to the hydraulic fracture experiment of the rock under the high-temperature and high-pressure condition.

Description

technical field [0001] The invention relates to a water sealing device for hydraulic fracturing experiments, in particular to a water sealing device suitable for hydraulic fracturing experiments of rock samples under high temperature and high pressure conditions. Background technique [0002] In recent years, in the process of exploiting geothermal energy, the construction of artificial circulation reservoir is the key and difficult point of the whole project, and its construction method is giant hydraulic fracturing. At present, there are still many issues such as the crack initiation pressure and the law of crack expansion that are worthy of further study. The research methods mainly adopt the methods of theoretical research and numerical calculation. However, neither of these two research methods can truly reflect the actual environment of on-site engineering. Due to the complexity of boundary conditions, there is still no effective equipment and method to carry out labo...

AI Technical Summary

Problems solved by technology

The former is prone to shrinkage after the hole is sealed, resulting in water leakage at the joint between the material and the hole wall, which directly affects the effect of pressure relief and anti-reflection measures; Compressive requirements for cracking technology

In summary, under high temperature and high pressure, conventional water sealing methods cannot be used

Under the water pressure of 400MPa, a small gap can also leak a large flow, so that the water pressure cannot be loaded to the target pressure

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