Experimental device and method for increasing flowing-around crude oil recovery ratio on basis of CO2-crude oil mass transfer

Abstract

The invention discloses an experimental device and method for increasing the flowing-around crude oil recovery ratio on the basis of the CO2-crude oil mass transfer effect. The experimental device mainly comprises an improved rock core clamping device used for wrapping a saturated oil rock core, simulating the existence state of flowing-around crude oil and meanwhile providing the high-temperatureand high-pressure environment of the CO2 and crude oil mass transfer effect, and the experimental device can be used for researching the adaptability, the optimum gas injecting mode and condition andthe like of the CO2-crude oil mass transfer effect for increasing the flowing-around crude oil recovery ratio. The experimental device and method for increasing the flowing-around crude oil recoveryratio on the basis of the CO2-crude oil mass transfer effect have the advantages that the experimental device and method are used for researching the adaptability, the optimum gas injecting mode and condition and the like of the CO2-crude oil mass transfer effect for increasing the flowing-around crude oil recovery ratio; reference is provided for researching of increasing the flowing-around crudeoil recovery ratio; and the technical thought of increasing the flowing-around crude oil recovery ratio is provided, namely, the flowing-around crude oil recovery ratio is increased through the CO2-crude oil mass transfer effect and is increased not only through regular air suction profile adjustment.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development engineering, in particular to a CO 2 -The experimental device and method for improving the oil recovery ratio of bypassing oil by mass transfer of crude oil. Background technique [0002] CO 2 Oil displacement and storage is one of the focuses of the current research on enhancing oil recovery and suppressing the greenhouse effect. CO 2 It has good oil displacement capacity, and the recovery factor of miscible flooding can theoretically reach 100%, and at the same time realize CO 2 underground storage. while CO 2 It is one of the major greenhouse gases, with more than 66% of climate warming associated with human activity emissions of CO 2 related. At the Copenhagen Climate Conference, my country pledged that by 2020, the unit of GDP CO 2 Emissions fell by 40% to 45% compared with 2005. Therefore, people are concerned about the use of CO 2 Flooding while achieving CO ...

AI Technical Summary

Problems solved by technology

2) CO is not set 2 - Crude oil contact cavity, difficult to ensure CO 2 - Adequate contact and mass transfer of crude oil

Simultaneously the present invention is provided with airtight dummy rock core 205 in the rock core holder, can by adjusting the method for dummy rock core 205 and saturated oil rock core 207 lengths, to simulate different scales and scales of flowing crude oil, investigate crude oil scale to CO 2 -The influence of crude oil to enhance the recovery, but the conventional huff and puff test device does not set the fake core or the fake core is not sealed, the crude oil tends to flow to the left under high pressure, causing a large recovery deviation

[0007] 1) CO 2 The throughput experimental device is not equipped with CO 2 - Crude oil contact chamber 213, difficult to ensure CO 2 - Sufficient exposure to crude oil;

[0008] 2) The core holder lacks the buffer of the contact chamber, and the high-pressure CO 2 It is easy to enter the end of the core, and it will displace the crude oil at the end and affect the CO 2 - Crude oil mass transfer to enhance crude oil recovery by bypass flow

[0009] 3)CO 2 The huff and puff test device is not equipped with a sealed fake core 205 or a non-closed fake core, crude oil tends to flow to the left under high pressure, causing a large deviation in oil recovery

[0010] 4) The problem of adjusting and simulating crude oil flowing around in different sizes and scales is not considered by matching the length of the sealed pseudo-core 205 and the oil-saturated core 207

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