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Imbibition experiment device and method under CO2 effects

A technology of experimental device and experimental method, which is applied in the direction of measuring device, material inspection product, permeability/surface area analysis, etc., can solve the problems of immature technology, complicated operation, low measurement accuracy, etc., and achieve improved oil recovery and method operation Simplicity and the effect of improving measurement accuracy

Active Publication Date: 2019-10-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mass method is a method for calculating the fluid saturation in porous media by measuring the mass of porous media. Due to its high degree of automation and high precision, the mass method is widely used, but this type of method is difficult to apply to imbibition experiments under formation conditions.
For the electronic balance built in the high-pressure container, the volume of the sensing element is relatively large, and the high temperature, high pressure and complex fluid composition conditions may affect the working accuracy of the sensing element; for the external electronic balance, the mechanical force transmission device (for example: hydraulic force transmission device) may cause a delay in the detection results, or even affect the results, so use the mass method for CO 2 The imbibition experiment under the action is more difficult
The volumetric method is a method for calculating the oil recovery by measuring the mass or volume of the oil phase imbibed out. Because the volumetric method is easy to operate, it is widely used, but the measurement accuracy of this method is low, and the oil phase imbibed from the porous medium Easy to adhere to the core surface, thus affecting the test accuracy
In addition, it is also beneficial to other core detection technologies (such as: CT technology) to measure the fluid saturation in the core. These methods are complicated to operate, high in cost, and the relevant technologies under high pressure conditions are immature. They are used for CO 2 It is difficult to realize the core detection of imbibition experiment under action

Method used

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  • Imbibition experiment device and method under CO2 effects
  • Imbibition experiment device and method under CO2 effects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] figure 1 shows an embodiment of the present invention in which the CO 2 Schematic diagram of the structure of the osmosis experimental device under the action of osmosis.

[0072] Such as figure 1 As shown, the embodiment provides a CO 2 The osmosis experimental device under the action includes:

[0073] Nitrogen container 1, nitrogen container 1 is used for containing nitrogen; CO 2 Vessel 2, CO 2 Container 2 is used to hold CO 2 ; The carbonic acid solution container 3, the carbonic acid solution container 3 is used to dress up the carbonic acid solution; The constant pressure injection pump 4, the constant pressure injection pump 4 is respectively connected with the nitrogen container 1, the CO 2 Container 2 and carbonic acid solution container 3 are connected, CO 2 Container 2 is connected with carbonic acid solution container 3; High-pressure container 5, the top of high-pressure container 5 is provided with cover body 6, and cover body 6 is provided with fi...

Embodiment 2

[0077] figure 2 shows a CO in one embodiment of the present invention 2 Flowchart of the experimental method for imbibition under action.

[0078] Such as figure 2 As shown, the embodiment provides a CO 2 The imbibition experimental method under action, this method comprises the steps:

[0079] Preparation of oil-saturated cores: Put the full-diameter shale cores into a muffle furnace and heat them to 300°C for more than 72 hours to decompose and gasify the fluid inside the cores, and then measure the geometric dimensions, mass, and helium porosity of the cores and gas phase permeability; put the core into the corresponding holder, pump out the air in the core with a molecular vacuum pump for more than 2 days, press light crude oil into the core, raise the temperature to 65°C, increase the pressure to 18MPa, and keep the condition constant Variable injection of crude oil to displace the light crude oil in the core, then aging the core for more than 1 month, and then floo...

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Abstract

The invention discloses an imbibition experiment device and method under CO2 effects. The device comprises a nitrogen container, a CO2 container, a carbonic acid solution container, a constant-pressure injection pump, a high-pressure container, and a gas-liquid separation device, wherein the constant-pressure injection pump is connected with the nitrogen container, the CO2 container and the carbonic acid solution container; a cover body is arranged at the top of the high-pressure container; a first outlet is arranged on the cover body; a second outlet is arranged on the upper side wall of thehigh-pressure container, and a carbonic acid solution inlet is arranged on the lower side wall of the high-pressure container; the first outlet is connected with the nitrogen container and the CO2 container; the carbonic acid solution container is connected with the carbonic acid solution inlet; and a carbonic acid solution inlet of the gas-liquid separation device is connected with the second outlet. The device and method has the advantages that imbibition experiments for low-permeability and tight cores can be carried out under high-temperature and high-pressure conditions, so that oil obtained from imbibition of the porous medium saturated cores can be prevented from adhering to the core surfaces; and the measuring precision of the volumetric method in imbibition oil recovery studies can be improved, so that the method can be applied in studies on the enhanced oil recovery mechanism of imbibition effects under CO2 conditions.

Description

technical field [0001] The invention belongs to the technical field of petroleum development, more specifically, relates to a CO 2 Apparatus and method for imbibition experiment under action. Background technique [0002] With the rapid development of fracturing and directional drilling technology in the United States, the shale oil and gas revolution has swept the world, and China's shale oil reserves are also very rich. Therefore, the status of unconventional oil and gas resources is becoming more and more important. For low-permeability, tight reservoirs to improve recovery The study of the mechanism is increasing day by day. CO 2 Flooding is an important method to enhance oil recovery in low-permeability and tight reservoirs. Since low-permeability and tight reservoirs have relatively small pore radius and strong capillary pressure, imbibition is one of the most important mechanisms for improving recovery in low-permeability and tight reservoirs. 2 The imbibition exp...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N33/24
CPCG01N15/08G01N33/24
Inventor 唐永强崔茂蕾王锐吕成远
Owner CHINA PETROLEUM & CHEM CORP