Three-cavity pressure separation device in high-temperature high-pressure container

Abstract

The invention discloses a three-cavity pressure separation device in a high-temperature high-pressure container, comprising an intermediate isolation ring, a steel bushing, a connection flange and a connection base which are sequentially connected. The intermediate isolation ring is internally provided with an inner seal ring, a first seal ring assembly is arranged between the outer wall of the intermediate isolation ring and the inner wall of the high-temperature high-pressure container, and a second seal ring assembly is arranged between the inner wall of the intermediate isolation ring andthe outer wall of the inner seal ring; the bushing wall of the steel bushing is provided with vent holes, and a lining of the steel bushing is provided with a rubber bushing which is internally provided with a cement target, a sandstone target and a filter in sequence; and a third seal ring assembly is arranged between the connection flange and the connection base, and a fourth seal ring assemblyis arranged between the lower end of the connection base and a seal head at the bottom of the high-temperature high-pressure container. Accordingly, three mutually independent pressure spaces are formed in the high-temperature high-pressure container. The device not only can be used for vividly simulating a stratum structure to establish stable shaft pressure, shaft confining pressure and pore pressure, but also can be used for realizing effective transmission between the shaft confining pressure and the pore pressure, and is suitable for ground simulated oil field perforation tests.

Description

technical field [0001] The invention relates to a device for establishing three-cavity pressure (wellbore pressure, wellbore confining pressure and pore pressure) in a sealing body in a perforation test of an oilfield simulated well, in particular to a three-cavity pressure separation device in a high-temperature and high-pressure container. Background technique [0002] In the oil extraction industry, the improvement of perforating equipment and perforating technology is of great significance to improve oil recovery and stabilize oil production. In order to be able to evaluate the perforation efficiency of perforating equipment and perforating technology on the ground, researchers need to establish a test device for perforating simulated wells in oil fields. [0003] At present, when most oil companies and their research institutes at home and abroad conduct simulated well perforation performance tests on the ground, their test devices are basically constructed in accordanc...

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Problems solved by technology

However, each of them has the following shortcomings: tests (1) to (3) can only evaluate the perforation performance of the perforation system from the aspects of penetration depth, hole diameter and burr height, which are different from the real state of the formation structure. too far

Under such high temperature and high pressure conditions, it is not only very difficult to establish the three-chamber pressure in the test sealed container, but also difficult to transfer between the pore pressure and the wellbore confining pressure

Even if the three-chamber pressure is established, the rubber sleeve sealing assembly that acts as a chamber partition is very easy to be damaged in the harsh environment of high temperature and high pressure, which makes the test impossible to continue, thus failing to meet the requirements of the oil exploration industry for improving perforating efficiency

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