Ultrahigh pressure and high temperature core holder

Abstract

The invention relates to an ultrahigh pressure and high temperature core holder, which comprises a core cabin, and a left seal plug and a right seal plug positioned at two ends of a core cabin cylindrical space and screwed tightly as well as sealed by a left compaction nut and a right compaction nut. The outer ends of the left seal plug and the right seal plug are respectively equipped with a left built-in needle valve and a right built-in needle valve. The inside of the core cabin 1 cylindrical space includes a core, choke plugs and a sleeve. Two sides of the core are respectively equipped with a choke plug. The choke plugs are in close contact with the core, and they are placed in a cylindrical sleeve inside the core cabin together. The outer wall of the core cabin is equipped with an upper built-in needle valve and a lower built-in needle valve. The holder core cabin, the choke plugs, the seal plugs, the compaction nuts, the built-in needle valves and valve accessories all employ a titanium alloy material, and the sleeve adopts polyetheretherketone. The core holder has the characteristics of ultrahigh pressure and high temperature, as well as light mass. With a highest bearable pressure of 200MPa, a highest temperature of 250DEG C, and an overall mass of 2600g, the core holder can realize precise weighing in a precision balance, thus providing a reliable guarantee for core flow experiments under ultrahigh pressure and high temperature conditions.

Description

technical field [0001] The invention relates to a rock core flow experiment testing device used in the field of exploration and development of oil and gas fields, in particular to an ultra-high pressure and high temperature rock core holder. Background technique [0002] During the core flow test, in order to simulate the geological conditions of abnormally high-pressure oil and gas fields, the experiment will be carried out under ultra-high pressure and high temperature conditions. The existing core holder generally has a working pressure of no more than 100 MPa, and the current holder sleeve is made of rubber The material, the gas will seep into the rubber under high pressure, resulting in the inaccurate metering of the gas flow. In addition, the existing holder has a large mass and cannot be weighed on a precision balance, so it is not suitable for accurate calculation of the saturation of gas and liquid under high pressure conditions. Contents of the invention [0003...

AI Technical Summary

Problems solved by technology

[0002] During the core flow test, in order to simulate the geological conditions of abnormally high-pressure oil and gas fields, the experiment will be carried out under ultra-high pressure and high temperature conditions. The existing core holder generally has a working pressure of no more than 100 MPa, and the current holder sleeve is made of rubber material, the gas will seep into the rubber under high pressure, resulting in the inaccurate metering of the gas flow

In addition, the existing holder has a large mass and cannot be weighed on a precision balance, so it is not suitable for accurate calculation of the saturation of gases and liquids under high pressure conditions

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