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co 2 Imbibition experiment device and method under action

An experimental method and technology of experimental device, applied in the field of petroleum development, can solve the problems of low measurement accuracy, affecting test accuracy, affecting results, etc.

Active Publication Date: 2021-09-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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Examples

Experimental program
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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 a CO 2 The imbibition experimental device and method under the action, including: nitrogen container; CO 2 container; carbonic acid solution container; constant pressure injection pump, the constant pressure injection pump is connected with nitrogen container, CO 2 The container is connected with the carbonic acid solution container; the high-pressure container, the top of the high-pressure container is provided with a cover, the cover is provided with a first outlet, the upper side wall of the high-pressure container is provided with a second outlet, and its lower side wall is provided with a carbonic acid solution inlet, The first outlet is respectively connected to the nitrogen container, CO 2 The container is connected, the carbonic acid solution container is connected to the carbonic acid solution inlet; the gas-liquid separation device, the carbonic acid solution inlet of the gas-liquid separation device is connected to the second outlet; the imbibition experiment of low permeability and dense core is carried out under high temperature and high pressure conditions, avoiding porous media The oil imbibed from the saturated core adheres to the surface of the core to improve the measurement accuracy of the volumetric method in the study of imbibition oil recovery, and is used to study the CO 2 Mechanism of enhanced oil recovery under imbibition 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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Patent Type & Authority Patents(China)
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
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