Oil-water-gas production control and metering device and method in heavy oil exploitation experiment

Abstract

The invention discloses an oil-water-gas production control and metering device and method in a heavy oil exploitation experiment, and relates to the physical simulation experiment field of heavy oilsteam injection SAGD exploitation. The device comprises an oil reservoir model, an output fluid regulating unit, an oil-gas-water separation unit and an oil-gas-water production and collection unit. The output fluid regulating unit comprises a temperature sensor used for measuring the temperature in the oil reservoir model, a pressure sensor used for measuring the pressure in the oil reservoir model and a first automatic regulating valve communicated with the oil reservoir model. The oil-gas-water separation unit comprises a heat exchange unit communicated with an automatic regulating valve, agas-liquid separation unit communicated with the heat exchange unit and a defoaming unit communicated with the gas-liquid separation unit. The oil-gas-water production and collection unit comprises afirst collection unit connected with the gas-liquid separation unit, a second collection unit connected with the fluid outlet of the defoaming unit and a gas metering unit communicated with the gas outlet of the defoaming unit. The gas metering unit is used for measuring the mass of gas flowing out of the defoaming unit. According to the oil-water-gas production control and metering device and method in the heavy oil exploitation experiment, the accuracy of the experiment can be greatly improved.

Description

technical field [0001] The invention relates to the field of physical simulation experiments of heavy oil steam injection SAGD mining, in particular to an oil-water-gas output control and metering device and method in heavy oil mining experiments. Background technique [0002] At present, in the physical simulation experiment of heavy oil steam injection SAGD production, in order to control the production pressure, the pressure of the steam chamber is generally controlled by manually adjusting the output valve or high temperature back pressure valve in the simulated downhole rod pumping process. The former operation method relies on experience, and the operation of repeatedly adjusting the opening of the needle valve is labor-intensive and poor in reliability. Especially when the experiment time exceeds 24 hours, the risk of experiment failure due to human factors is extremely high. The latter high-temperature back-pressure valve is suitable for low-viscosity, single-phase f...

AI Technical Summary

Problems solved by technology

The former operation method relies on experience, and the operation of repeatedly adjusting the opening of the needle valve is labor-intensive and has poor reliability. Especially when the experiment time exceeds 24 hours, the risk of experiment failure due to human factors is extremely high

The latter high-temperature back-pressure valve is suitable for low-viscosity, single-phase fluids, and the control effect on the production fluid (high-viscosity, multi-phase fluids) in the physical simulation experiment of heavy oil steam injection SAGD production is very poor, and it is generally observed that pressure fluctuations, and even pipeline blockage

The conventional methods mentioned above will lead to low repeatability of the experiment, which is extremely unfavorable for the sensitivity analysis of different factors

In terms of water separation and measurement in the output liquid, due to the large fluctuations in the flow rate and temperature of the output liquid in the experiment, and the wide range of enthalpy changes, the conventional circulating cold water bath method has poor control effect. When the flow of cold water is large and the temperature is low It will cause the viscosity of crude oil in the production fluid to rise sharply, and the pipeline will be blocked, so the experiment may be forced to terminate; and when the flow of cold water is small and the temperature is high, the heat exchange will be insufficient, and the water in the production fluid will be in the form of steam output, it is difficult to collect, and the measured output water volume is low, resulting in a high oil-steam ratio

Overall, none of the existing methods can ensure accurate metering of produced water

In terms of output gas separation and metering, the conventional method is to use a vapor-liquid separator to measure the upper separated fluid. However, the output gas flow rate and temperature change as the experiment progresses, and it is inevitable that part of the gas will flow from the vapor to the liquid. The output at the bottom of the liquid separator, resulting in low metering data

In addition, crude oil and some additives contain similar surfactants, which will cause part of the produced gas to be produced from the upper part of the gas-liquid separator in the form of foam, which will also lead to errors in gas output measurement

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