A Method for Determining Gas Diffusion Coefficient in Thermal Recovery of Heavy Oil

A technology of gas diffusion and thermal recovery of heavy oil, applied in the direction of diffusion analysis, instruments, surface/boundary effects, etc., can solve the problems affecting the recovery rate, inconsistency, and affecting the physical parameters of the reservoir, so as to achieve accurate recovery rate, Accurate calculation, the effect of reducing mining costs and risks
CN113008739BActive Publication Date: 2022-06-21CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Publication Date
2022-06-21

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Abstract

The invention belongs to the technical field of oil and gas field development engineering, and in particular relates to a method for determining the gas diffusion coefficient under heavy oil thermal recovery conditions. The method is used to determine the gas diffusion coefficient in saturated heavy oil cores under one-dimensional heat transfer conditions. The experimental pressure curve during the diffusion process was obtained by the pressure drop method; on the basis of determining the temperature field, the influence of temperature changes on the physical parameters of crude oil and rocks was considered; the theoretical pressure during the diffusion process was calculated by the PR state equation; The measured pressure curve is fitted with the calculated theoretical pressure curve to obtain the diffusion coefficient of gas in the saturated heavy oil core under the condition of one-dimensional heat transfer. The method for determining the gas diffusion coefficient under the condition of thermal recovery of heavy oil provided by the invention takes into account the change of reservoir physical parameters during the heat transfer process, and the calculated gas diffusion coefficient is closer to reality, providing a more accurate solution for thermal recovery of heavy oil. For reference, the predicted recovery rate is more accurate, reducing the cost and risk of mining.
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Description

technical field

[0001] The invention relates to a method for determining the gas diffusion coefficient under the condition of heavy oil thermal recovery, belonging to the technical field of oil and gas field development engineering. Background technique

[0002] Heavy oil has the characteristics of high viscosity, poor fluidity and high difficulty in recovery under reservoir conditions, which makes thermal oil recovery an effective way to recover heavy oil. On the basis of steam injection, auxiliary gas (N 2 , CO 2 , flue gas, etc.) can effectively supplement the formation energy, reduce the viscosity of heavy oil and expand the steam heating range, which can improve the thermal recovery effect. In the stage of steam huff and puff, the fluid in the reservoir cannot seep, and diffusion is the main mode of migration. The gas diffusion coefficient is the main parameter describing the diffusion, which determines the concentration and migration distance of gas diffusion in the...

Claims

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