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System and method for evaluating the effect of CO2 emulsion on oil reservoir displacement

An emulsion and oil reservoir technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the rare, unusable displacement mechanism, and cannot clearly reflect the heavy oil and gel/high temperature steam system Interaction mechanism and other issues to achieve the effect of improving the displacement effect

Pending Publication Date: 2018-11-23
PETROCHINA CO LTD
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Problems solved by technology

However, the two-dimensional visualized physical simulation equipment used in this research is made of high-temperature and high-pressure perforated quartz glass and glass beads with a particle size of 40 mesh. It belongs to a homogeneous reservoir model, and images are collected through a macro lens. Limited, cannot clearly reflect the interaction mechanism of heavy oil and gel / high temperature steam system in the two-dimensional visual physical simulation equipment
Moreover, this visualization experiment is aimed at evaluating the effect of high-temperature gel on improving steam flooding, and cannot be used to study CO 2 Reservoir Displacement Mechanism of Emulsion Huff and Puff
[0005] Thus, it can be seen that the current CO 2 There are relatively few studies on the displacement effect of emulsion huff and puff on high-temperature and high-pressure heterogeneous reservoirs. 2 The evaluation methods and systems for the displacement effect of emulsion huff and puff on high-temperature and high-pressure heterogeneous reservoirs are rarely seen in scientific literature

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  • System and method for evaluating the effect of CO2 emulsion on oil reservoir displacement

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preparation example Construction

[0094] The present invention does not specifically limit the preparation method of the heterogeneous core model, and conventional preparation methods in the field can be used, whichever can simulate the actual rock conditions. In the specific implementation process of the present invention, a suitable permeability heterogeneous core model is obtained by selecting suitable mesh size quartz sand and filling sand.

[0095] The present invention does not specifically limit the number of simulated heterogeneous core molds 1 , it can be one or more, and can be reasonably set according to specific experimental purposes. In a specific embodiment of the present invention, please refer to figure 1 The simulated heterogeneous core model 1 includes a first simulated heterogeneous core model 11 and a second simulated heterogeneous core model 12 connected in parallel. Specifically, a heterogeneous core model with relatively high permeability and a heterogeneous core model with low permeabi...

Embodiment 1

[0118] This embodiment provides an evaluation CO 2 Methods for the displacement effect of emulsions on reservoirs, including:

[0119] First, two heterogeneous core models with different permeability were prepared, among which the gas permeability of the high permeability heterogeneous core model was 1019mD, and the gas permeability of the low permeability heterogeneous core model was 201mD. The specifications of the two heterogeneous core models are the same: inner diameter 2.51cm, length 10.06cm.

[0120] Secondly, the above-mentioned heterogeneous core model is adjusted to simulate the heterogeneous core model 1, which specifically includes the following steps in sequence:

[0121] 11) Adjust the temperature in the heterogeneous core model to 80°C;

[0122] 12) The pressure in the heterogeneous core model is adjusted to 20MPa;

[0123] 13) Inject saturated water into the heterogeneous rock core model, so that the gap between the rock cores in the heterogeneous rock core ...

Embodiment 2

[0132] This embodiment provides an evaluation CO 2 Methods for the displacement effect of emulsions on reservoirs, including:

[0133] First, two heterogeneous core models with different permeability were prepared, among which the gas permeability of the high-permeability heterogeneous core model was 1052mD, and that of the low-permeability heterogeneous core model was 196mD. The specifications of the two heterogeneous core models are the same: inner diameter 2.49cm, length 9.98cm.

[0134] Secondly, the above-mentioned heterogeneous core model is adjusted to simulate the heterogeneous core model 1, which specifically includes the following steps in sequence:

[0135] 11) Adjust the temperature in the heterogeneous core model to 80°C;

[0136] 12) The pressure in the heterogeneous core model is adjusted to 20MPa;

[0137] 13) Inject saturated water into the heterogeneous rock core model, so that the gap between the rock cores in the heterogeneous rock core model is filled w...

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Abstract

The invention provides a system and method for evaluating the effect of CO2 emulsion on oil reservoir displacement. The system comprises a high temperature steam generating device for injecting high temperature steam into a simulated heterogeneous core model; an emulsion generator for injecting CO2 emulsion into the simulated heterogeneous core model; a first pressure control device for regulatingthe pressure of the simulated heterogeneous core model to the exploiting pressure; a drainage gas collection device for collecting and measuring exploitation products. The present invention also provides a method for evaluating the effect of CO2 emulsion on reservoir displacement. By simulating the high-temperature steam-assisted CO2 emulsion throughput, the displacement effect of the reservoir in the heterogeneous core model is evaluated to provide guidance for the application of high-temperature steam-assisted CO2 emulsion stimulation to produce heterogeneous heavy oil.

Description

technical field [0001] The present invention relates to a method for evaluating CO 2 Systems and methods for the displacement effect of emulsions on reservoirs, especially a system and method for evaluating high-temperature steam-assisted CO 2 The system and method for improving the displacement effect of heterogeneous heavy oil reservoir by emulsion huff and puff belong to the field of oil and gas field development engineering technology. Background technique [0002] CO 2 One of the advantages is that it is easy to reach the supercritical state. In the state where the temperature is 31.1°C higher than the critical temperature and the pressure is 7.38MPa higher than the critical pressure, CO 2 Its properties will change, mainly reflected in: the density is close to that of liquid, the viscosity is close to that of gas, and the diffusion coefficient is 100 times that of liquid, so it has a greater dissolving ability. Under high temperature and high pressure oil well condi...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B43/22E21B43/16
CPCE21B43/16E21B43/164E21B43/24Y02P90/70
Inventor 刘己全王鹏宋文文
Owner PETROCHINA CO LTD
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