Reaction kettle, device and method for testing solubility of natural gas under high-temperature and high-pressure conditions

Abstract

The invention discloses a reaction kettle, device and method for testing the solubility of natural gas under high-temperature and high-pressure conditions. The reaction kettle comprises a kettle body and a heating device, wherein the kettle body is internally divided into a dissolution reaction cavity and a gas pressurization cavity, the gas pressurization cavity is internally divided into a pressurization cavity I and a pressurization cavity II, and a buffer cavity is formed in the pressurization cavity I; a high-pressure sealing piston is arranged in the pressurizing cavity II to divide the pressurizing cavity II into a first pressurizing cavity II and a second pressurizing cavity II; the dissolution reaction cavity is provided with a gas sampling port, a temperature sensor, a pressure sensor and a liquid inlet / outlet; the pressurizing cavity I is provided with an air source inlet, a one-way valve I is arranged in the air source inlet and connected with the buffer cavity, the buffer cavity is connected with the dissolution reaction cavity through an air outlet pipe I, and a one-way valve II is arranged on the air outlet pipe I; and the buffer cavity is connected with a first pressurizing cavity II through a gas outlet pipe II, spacer fluid is arranged in a second pressurizing cavity II, and a pressure-bearing liquid inlet is formed in the second pressurizing cavity II. The device can accurately measure solubility of natural gas under high temperature and high pressure.

Description

technical field [0001] The invention relates to the technical field of natural gas solubility testing, in particular to a reaction kettle, device and method for testing the solubility of natural gas under high temperature and high pressure conditions. Background technique [0002] Natural gas solubility is one of the key parameters in the evaluation of oil and gas reservoir reserves. At present, the research on the solubility of natural gas at home and abroad mainly focuses on the medium and low pressure conditions, but there are few studies on the solubility of natural gas under high temperature and high pressure conditions (referring to the pressure up to 100MPa and the temperature up to 200°C). The main reasons include (1) It is difficult to achieve Pressure above 100MPa; (2) It is difficult to solve the sealing problem of gas under high temperature conditions; (3) It is difficult to obtain gas samples under high temperature and high pressure conditions; (4) Pressure fluc...

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Problems solved by technology

At present, researches on the solubility of natural gas at home and abroad are mainly concentrated on the medium and low pressure conditions, but there are few studies on the solubility of natural gas under high temperature and high pressure conditions (referring to pressure up to 100MPa, temperature up to 200°C). The main reasons include (1) It is difficult to achieve Pressure above 100MPa; (2) It is difficult to solve the sealing problem of gas under high temperature conditions; (3) It is difficult to obtain gas samples under high temperature and high pressure conditions; (4) Pressure fluctuations are easy to occur during sampling under high temperature and high pressure conditions, which affects the accuracy of data (5) As the temperature and pressure change, the solubility of the mixed gas affects each other and changes greatly, which also leads to large errors in measurement

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