Ternary system high temperature high pressure fluid solubility equilibrium sampling system

Abstract

The invention relates to a ternary system high temperature high pressure fluid solubility equilibrium sampling system. The system comprises a high temperature high pressure dissolving unit, which comprises a dissolving kettle body and a dissolving heating furnace, wherein the dissolving heating furnace is arranged on the periphery of the dissolving cylinder so as to keep a constant temperature in the dissolving kettle body, and the side wall of the dissolving kettle body is provided with a sampling opening; a high pressure balancing unit, which is connected to the end part of the dissolving kettle body so as to keep a constant pressure in the dissolving kettle body; and a balance quantitatively sampling unit, which comprises a sampling valve, a balance quantitatively sampling device, a sampling heating furnace, and a pressure maintaining device, wherein the sample valve is arranged between the sampling opening and the balance quantitatively sampling device, the sampling heating furnace is arranged on the periphery of the balance quantitatively sampling device to make the temperature in the balance quantitatively sampling device be close to the temperature in the dissolving kettle body, and the pressure maintaining device is connected to the balance quantitatively sampling device in order to modulate the pressure in the balance quantitatively sampling device to narrow down the pressure difference between the balance quantitatively sampling device and the dissolving kettle body. The provided sampling system can realize constant-temperature constant-pressure homogenous sampling.

Description

technical field [0001] The invention relates to the technical field of dissolution and phase balance in physical chemistry and the technical field of oil and gas exploration and development, in particular to a ternary system high temperature and high pressure fluid dissolution equilibrium sampling system. Background technique [0002] The method for measuring the mutual solubility of ternary system fluids under high temperature and high pressure mainly adopts the static method. The main difficulty of using this method to determine the solubility is how to keep the dissolution balance not to be broken, that is, to keep the temperature, pressure and the amount of the substance constant. Take out the sample from the dissolution kettle under different conditions, and then use gas chromatography (GC), high performance liquid chromatography (HPLC), gravimetric method and other testing methods to measure the dissolved amount of solute in the ternary system fluid. The main problem i...

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Problems solved by technology

The main problem in the prior art is: it is difficult to keep the pressure constant during sampling, and in order to keep the pressure constant, other fluids, such as nitrogen, need to be injected into the ternary system fluid, but this method cannot be used for both gas and liquid. Phase Dissolution Equilibrium Sampling

The above method only considers the pressure balance during sampling, but does not consider the influence of temperature drop on the dissolution balance during sampling.

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