Device and method for oil-gas-water three-phase quantitative and hermetical sampling for indoor experiment

Abstract

The invention discloses a device for oil-gas-water three-phase quantitative and hermetical sampling for the indoor experiment. The device comprises an oil-gas-water quantitative sampling unit, a gas quantitative collecting unit, a crude oil treating unit and a produced water treating and quantitative collecting unit, wherein the gas quantitative collecting unit, the crude oil treating unit and the produced water treating and collecting unit are respectively connected with the oil-gas-water quantitative sampling unit via pipelines. The invention also discloses a method for oil-gas-water three-phase quantitative and hermetical sampling for the indoor experiment, and the method comprises the following specific steps of collecting an oil-gas-water mixture, separating oil, gas and water primarily, dehydrating crude oil containing water and deoiling produced water containing oil. The device has the characteristics of reasonable design, simple structure, running stability, time and labor conservation and environmental friendliness, and the device and the method can be widely applied to indoor experiment quantification, pressurization and hermetical sampling.

Description

1. Technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a device and method for quantitative and airtight sampling of oil, gas and water three-phase for indoor experiments. 2. Background technology [0002] Microbial Enhanced Oil Recovery refers to the technology of using microorganisms (mainly bacteria, archaea) and their metabolites to improve crude oil production and recovery. Compared with other tertiary oil recovery technologies, microbial technology is applicable It has the characteristics of wide range, simple process, good economic benefits, and no pollution, and has good application prospects, so it has attracted more and more attention. The physical simulation experiment of microbial flooding is to activate functional microorganisms under the reservoir conditions of the simulated test block. , Oil displacement effect evaluation and on-site injection process parameter optimization are indispen...

AI Technical Summary

Problems solved by technology

[0003] At present, during the sampling process of the produced fluid in laboratory experiments, the pressure of the sample will suddenly release and drop to atmospheric pressure, resulting in changes in the microbial community structure in the produced fluid, and the test results cannot truly and objectively reflect the community structure in the formation water under high-temperature and high-pressure reservoir conditions; The exposure of the output liquid to the air destroys the original anaerobic environment, causing the oxygen in the air to partially dissolve into the production liquid, making the redox potential test results inaccurate; at the same time, due to the limited pore volume of the main body of the indoor simulation device, the indoor experiment sampling The amount is usually larger than the amount required for the test. On the one hand, it causes waste of samples. On the other hand, excessive sampling affects the seepage form of crude oil and water in the body.

[0004] After patent and literature search, the patent number is "ZL91109848", and the name is "Suspension Sampling Method and Device", which introduces a method for extracting samples from solid particle suspensions, and extracts part of the suspension from the suspension tank bypass. and send it to an analyzer to analyze its composition. The defect is that the device samples the suspension under normal temperature, normal pressure, and open conditions, which cannot meet the requirements of high pressure, airtight sampling and separation; the patent number is " 201010552732.3", titled "A Reservoir Production Fluid Sampling Method and Device for Microbial Flooding", introduces a production fluid sampling method and device, mainly composed of reservoir temperature and pressure testing and control, sampling device anaerobic treatment, oil-gas-water high-pressure and high-temperature separation, oil-gas-water anaerobic and high-pressure sampling, oil-gas-water sample online testing, oil-gas-water test result processing, and remote transmission device. The disadvantages of this invention are complex structure, large footprint, and complicated sampling procedures. ; Can not meet the requirements of quantitative sampling, therefore, it is easy to cause a lot of waste of oil, gas and water

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