High-temperature and high-pressure sulfur deposition microscopic seepage visualization experiment device and method

Abstract

The invention discloses a high-temperature and high-pressure sulfur deposition microscopic seepage visualization experiment device and method. The device is composed of an injection system, a high-temperature and high-pressure visual kettle (14), a pressure supply system, a data acquisition and analysis system, a fluid recovery system and an injection branch pipe; the injection system comprises an ISCo micro-injection pump (1), an intermediate container, a constant-temperature heating box (6) and a pressure gauge (3), the intermediate container is arranged in the constant-temperature heating box (6), and the ISCo micro-injection pump (1) is connected with the intermediate container; the data acquisition and analysis system comprises a microscope (13), a high-brightness light source and a computer (26); the pressure supply system comprises an annular pressure tracking pump (28), a back pressure pump (28), a back pressure valve (18) and a pressure gauge (17); and the fluid recovery system comprises a wide-mouth bottle (21) with a rubber plug, a balance (22), a flowmeter (23) and a tail gas absorption tank (24). With the high-temperature and high-pressure sulfur deposition microscopic seepage visualization experiment device and method of the invention adopted, the problem that the microscopic morphology and the deposition amount of sulfur at the throat of arock core cannot be observed in real time in the previous sulfur deposition microscopic seepage experiment is solved.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir exploitation research, in particular to a high-temperature and high-pressure sulfur deposition microscopic seepage experiment device and method, which are suitable for the experimental research on sulfur deposition microscopic seepage in high-sulfur gas reservoirs under simulated formation conditions. Background technique [0002] High-sulfur gas reservoirs are a special type of sour gas reservoirs. The main characteristics of this type of gas reservoirs are: deep gas reservoir burial, high hydrogen sulfide content, and large geothermal gradient. Hydrogen sulfide is an important industrial raw material with high economic value, but the existence of hydrogen sulfide in natural gas has adverse effects on the exploration, development and utilization of natural gas. During the production process, as the pressure and temperature decrease, the solubility of sulfur in the acid gas decreases...

AI Technical Summary

Problems solved by technology

Hydrogen sulfide is an important industrial raw material with high economic value, but the existence of hydrogen sulfide in natural gas has adverse effects on the exploration, development and utilization of natural gas

During the production process, as the pressure and temperature decrease, the solubility of sulfur in the acid gas decreases, and the sulfur element is precipitated, part of which moves with the gas flow, and part of it will be deposited in the formation, blocking the seepage channel of natural gas and reducing the formation permeability. In severe cases , will form sulfur plugging, seriously affecting the productivity of gas wells in high-sulfur gas reservoirs

[0003] At present, there are many microscopic seepage experimental devices and methods, but regarding the high-sulfur microscopic seepage experiments, they only evaluate the degree of sulfur deposition from the damage to the formation permeability, and fail to directly observe the occurrence process of sulfur deposition

And the conventional micro-seepage device does not consider the danger of sulfur, and the heating of the micro-seepage experimental device is uncontrollable, and the observation of the seepage process, the control of pressure and flow, and the detection are not accurate enough

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