Light crude-oil circular gas-injection low-temperature oxidization experimental method and device

Abstract

The invention discloses a light crude-oil circular gas-injection low-temperature oxidization experimental method and device. The experimental device comprises a modeling system, a circulating system, an analysis system and a personal computer (PC) monitoring system; the model system is used for simulating the oil reservoir pressure and for simulating an oil reservoir temperature, and the produced gas is sent into the analysis system through the circulating system; the analysis system is used for analyzing the composition of the produced gas and for sending the produced gas after being analyzed into the circulating system; the circulating system is used for returning the produced gas to the modeling system to realize the circular monitoring; and the PC monitoring system is used for monitoring the simulated oil reservoir pressure and the simulated oil reservoir temperature of the modeling system and for recording the gas composition which is circularly monitored by the analysis system. The method and the device adopts a circular gas injection way, so the problem that the experimental balance is broken because of the gas sampling analysis in the reaction system during the experimental process can be avoided.

Description

technical field [0001] The present invention relates to the field of petroleum development, in particular to a low-temperature oxidation experiment method and device for light crude oil circulation gas injection, and specifically to a method and device for realizing circulation gas injection during the dynamic displacement of light crude oil by air injection and oil production. The experimental method and device for avoiding the problem of breaking the balance of the experiment by taking gas samples for analysis during the experiment. Background technique [0002] Since the 1960s, many countries in the world have carried out research on air injection oil recovery technology for light oil reservoirs, and many deep light oil reservoirs have carried out field tests of air injection, all of which have achieved technical and economic success; Air injection oil recovery is a measure of oil recovery by injecting air into the oil layer from the gas injection well to supplement and m...

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Problems solved by technology

[0003] Although the development of light oil reservoirs by air injection and low-temperature oxidation started relatively late in my country, due to the wide source of air and low cost, it has attracted extensive attention in recent years. Several oil fields have also carried out small-scale field tests of air foam flooding (regulation and flooding) , and achieved very good results, but the overall research on the mechanism of low-temperature oxidation with air injection is not systematic and perfect

[0004] The disadvantage of air injection production in light oil reservoirs is that there are unsafe factors, that is, when the oxygen in the injected air does not completely undergo low-temperature oxidation reaction with crude oil, the mixture of hydrocarbon gas and oxygen in the produced gas is prone to explosion; Another characteristic of air is that the properties of crude oil will change after low-temperature oxidation, such as viscosity changes and composition changes. These changes in crude oil properties may cause damage to the pore structure of low-permeability reservoirs, which strictly requires low-temperature oxidation in the early stage. Based on relevant experimental research, the injection-production parameters should be rationally optimized

[0005] At present, although a lot of work has been carried out at home and abroad on the research of low-temperature oxidation experimental simulation methods and devices for air injection development of light oil reservoirs, there are still the following deficiencies in the existing experimental methods and devices for low-temperature oxidation of crude oil: 1) The gravitational differentiation effect caused by the oil-gas density difference is not considered, and the low-temperature oxidation of crude oil still occurs at the oil-gas interface and the oxygen dissolved in the crude oil participates in the reaction, and the reliability of the experimental results is poor; 2) The dynamic displacement process device is not well considered Cause gas channeling, resulting in uneven low-temperature oxidation reaction of the sample, and the reliability of the experimental results is poor; 3) There is no multi-channel acquisition system for pressure, temperature and volume data; 4) The degree of automation of the experimental process is not high; 5) There is no production On-line real-time monitoring function of gas output; 6) Data collection is mostly manual reading, which will cause a lot of human errors

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