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Experimental device and method for measuring efficiency of replacing crude oil with supercritical carbon dioxide in tight oil core

A technology of carbon dioxide and experimental equipment, applied in the direction of using material absorption and weighing, etc., can solve the problems of low measurement accuracy, impossibility of laboratory popularization, and high experimental cost

Active Publication Date: 2020-06-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The analysis of the replacement amount by this method is restricted by the accuracy of the NMR spectrum and external interference, and it is impossible to measure the CO entering the core. 2 amount, and the displaced crude oil exists on the surface of the core, affecting the actual results
In addition, this method has complicated equipment, high experimental cost, and low measurement accuracy, so it cannot be popularized in laboratories.

Method used

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  • Experimental device and method for measuring efficiency of replacing crude oil with supercritical carbon dioxide in tight oil core
  • Experimental device and method for measuring efficiency of replacing crude oil with supercritical carbon dioxide in tight oil core
  • Experimental device and method for measuring efficiency of replacing crude oil with supercritical carbon dioxide in tight oil core

Examples

Experimental program
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Effect test

Embodiment 1

[0096] An experimental device for measuring the efficiency of replacing crude oil with supercritical carbon dioxide in tight oil rocks, comprising a constant temperature box 28, in which a first intermediate container 5, a second intermediate container 11, a core holder 15, and a replacement intermediate container 19 are arranged, The first intermediate container contains crude oil and the second intermediate container contains CO 2 , the first intermediate container and the second intermediate container are connected to the displacement pump 8 through pipelines, the first intermediate container is connected to the core holder through the pipeline, and the core holder is used for core saturated crude oil;

[0097] Both the first intermediate container and the second intermediate container are connected to the replacement intermediate container through pipelines, and the replacement intermediate container is used to hold the experimental rock core and replace the crude oil with ...

Embodiment 2

[0105] An experimental device for measuring the efficiency of replacing crude oil with supercritical carbon dioxide in tight oil rocks. Its structure is as described in Example 1, the difference is that a support 22 and a support 20 are arranged in the replacement intermediate container, and the upper and lower supports are used for replacing The rock core is fixed in the intermediate container, so that the rock core is still fixed when the intermediate container is replaced.

Embodiment 3

[0107] An experimental device for measuring the efficiency of replacing crude oil with supercritical carbon dioxide in tight oil rocks. Its structure is as described in Example 2. The difference is that a turning motor is provided outside the replacement intermediate container, and the turning motor is used to move the replacement intermediate container through 180°. rotate. When measuring CO 2 When displacing the amount, the intermediate container should be rotated 180°. Due to the influence of gravity and the placed bracket, the CO 2 All the displaced crude oil enters the drying tube and is collected by absorbent cotton, which is conducive to the collection of oil to the outlet of the intermediate container, which greatly improves the accuracy of the experiment. The replacement intermediate container has only one entrance and exit, and it can be turned over immediately after the core is placed so that the entrance and exit are downward, and CO can be injected with the entra...

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Abstract

The invention relates to an experimental device and method for measuring the efficiency of replacing crude oil with supercritical carbon dioxide in a tight oil core. The invention belongs to the technical field of oil-gas field development. The device comprises a constant-temperature box, an intermediate container containing crude oil and CO2, a rock core holder and a replacement intermediate container, saturated crude oil operation and CO2 pressurization and injection operation are conducted on a rock core through a displacement pump, the amount of crude oil replaced by CO2 under different pressures and different pressure drops is measured, and the CO2 utilization rate and the CO2 crude oil replacement efficiency are calculated. Compared with the prior art, according to the invention, themeasurement of the efficiency of replacing crude oil in a compact rock core with supercritical CO2 at high temperature and high pressure is realized; gas expansion errors caused by adopting a traditional rock core weighing method are reduced, the limitation that the traditional method can only measure the replacement efficiency from formation pressure to atmospheric pressure is broken through, and measurement of the crude oil replacement amount under different pressure drops and gas-oil separation and accurate metering in the pressure drop process are achieved. The device is low in construction cost, wide in application range, high in precision, high in experiment repeatability and easy to popularize.

Description

technical field [0001] The invention relates to an experimental device and method for measuring the efficiency of replacing crude oil by supercritical carbon dioxide in tight oil rocks, belonging to the technical field of oil and gas field development, and used for measuring the replacement efficiency of crude oil by carbon dioxide during the process of injecting carbon dioxide to develop crude oil. Background technique [0002] With the deepening of exploration and development in onshore sedimentary basins, fewer and fewer high-quality oil reserves are found to be available for development. Gradually develop from conventional oil and gas resources to unconventional oil and gas resources such as tight oil and gas reservoirs and shale oil and gas reservoirs. Tight oil reservoirs and shale oil reservoirs have poor reservoir physical properties and severe water sensitivity, so conventional water flooding development has unsatisfactory production stimulation effects. [0003] C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/02
CPCG01N5/02
Inventor 李蕾苏玉亮范理尧陈征吕玉廷唐梅荣李晓燕
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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