Low-temperature oxidation experimental method and device of crude oil extracted by injecting air into light oil reservoir

Abstract

The invention discloses a low-temperature oxidation experimental device of crude oil extracted by injecting air into a light oil reservoir. The experimental device consists of an injection system, a module system, a data acquisition and control system, a first output system, a second output system, a first analysis system and second analysis system, wherein one side of the module system is communicated and connected to the injection system; the upper end of the module system is connected to the first output system for collecting free gas and the second output system for collecting live oil, wherein the first output system and the second output system are arranged in parallel; the output end of the first output system is communicated to the first analysis system; a sampling end for dissolved gas separated out by using the second output system is communicated to the first analysis system; a sampling end of a liquid separated out by using the second output system is communicated to the second analysis system; and the module system is further connected to the data acquisition and control system. In the device, a free gas sample and live oil under experimental pressure are sampled by using the two output systems respectively, and the dissolved gas in the live oil is separated out for gas constituent and crude oil property analysis, so that the accuracy of an analysis result is ensured.

Description

technical field [0001] The invention relates to an experimental method and device in the field of petroleum development, in particular to an experimental method and device for the low-temperature oxidation rate of crude oil and the change of crude oil properties in light oil reservoirs by air injection. 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 maintain the pressure of the oil layer, and utilizing the gas drive effect of the oxidation product flue and the heat generation effect of oxidation. The low-temperature oxidation refers to the oxidation reaction between formation crude ...

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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 capacity 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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