A supercritical carbon dioxide injection device for heavy oil mechanism experiment

Abstract

The invention discloses a supercritical carbon dioxide injection device used for heavy oil mechanism experiments, which adopts a driving gas source injection device, an air flow control device, a safety protection device and a control system; two independently arranged first gas booster pumps and second gas booster pumps The output ends of the two gas booster pumps are connected in series, and a cut-off valve, a pressure gauge and a flow proportional valve are set at the inlet end to simultaneously control the first gas booster pump and the second gas booster pump to improve boosting efficiency and Accuracy, after setting a constant temperature water bath with a preset temperature, measure the flow rate and pressurize, effectively solve the problem that the phase change of carbon dioxide during the pressurization process leads to large mass measurement errors, and the invention can realize continuous and stable small flow supercritical carbon dioxide The output has the function of constant current, constant pressure and constant temperature output. It has the characteristics of simple operation, safety and reliability, and meets the requirements of indoor heavy oil mechanism research based on carbon dioxide. The control system can realize precise control and feedback and improve control accuracy.

Description

technical field [0001] The invention relates to a supercritical carbon dioxide injection device used for heavy oil mechanism experiments, which can continuously and stably output small-flow supercritical carbon dioxide, and is used for carbon dioxide miscible flooding research or carbon dioxide-assisted supercritical water heavy oil thermal recovery research, which belongs to petroleum Fields of engineering and process technology. Background technique [0002] The resources suitable for the development of carbon dioxide in the world are 300 billion to 600 billion barrels. Compared with other oil displacement technologies, carbon dioxide flooding has the characteristics of wide application range, low oil displacement cost and high recovery rate. It can not only meet the needs of oilfield development, but also It can also solve the problem of carbon dioxide sequestration. Due to the limited platform space and short service life of offshore heavy oil platforms, supercritical m...

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Problems solved by technology

At present, the existing method is to press the gas pressurized from the gas cylinder into the intermediate piston container again, and then inject carbon dioxide into the follow-up device through the other side of the piston container. The structure limits the pressure injection, and there are the following disadvantages: 1. The volume of the piston container is limited, and the volume of stored compressed gas is limited, which is difficult to meet the requirements of long-term experiments; 2. The feedback is slow, and the compression coefficient of water and carbon dioxide is greatly different. The fluctuation of back pressure will cause the gas to fail to output in time; 3. Use the middle piston The container is pressurized gas, the pressure upper limit is low, and the experimental research under the condition of high pressure parameters cannot be completed

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