A method and system for determining lower limit of gas drive reservoir parameters of an oil reservoir type gas storage

By improving the Kozeny-Carman model and fitting data, the problem of determining the lower limit of gas-driven reservoir parameters in oil-type gas storage facilities was solved, achieving higher-precision reservoir evaluation. This model is applicable to oil-type gas storage facilities, and the constructed software system facilitates parameter acquisition, improving gas-driven performance and gas storage capacity.

CN117786926BActive Publication Date: 2026-06-23PETROCHINA CO LTD
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PETROCHINA CO LTD
Filing Date
2022-09-22
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing technologies have failed to effectively determine the lower limit of gas drive reservoir parameters in oil-type gas storage facilities, resulting in insufficient consideration of the impact of gas drive development and gas storage capacity. Traditional methods have significant limitations and are difficult to reflect the multifaceted characteristics of the reservoir.

Method used

By modifying and improving the Kozeny-Carman model, introducing lithology index and applying effective porosity, and combining unsteady seepage, slippage effect, distribution function and molecular free path, a porosity-permeability relationship model of gas-driven reservoir permeability-effective porosity is constructed. Simulation and measured data are then fitted to determine the lower limit of gas-driven reservoir parameters.

Benefits of technology

A more accurate method for determining the lower limit of gas-driven reservoir parameters is provided, which is applicable to oil reservoir-type gas storage facilities. The constructed porosity-permeability relationship model can be developed into a software system. The parameters are easy to obtain and have good promotional advantages, thus improving the reservoir evaluation accuracy of the gas-driven process.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN117786926B_ABST
    Figure CN117786926B_ABST
Patent Text Reader

Abstract

The application belongs to the field of oil exploitation, gas injection development and gas storage, and particularly relates to a method and system for determining the lower limit of gas drive reservoir parameters of an oil reservoir type gas storage, comprising the following steps: modifying and improving a Kozeny-Carman model to obtain an improved Kozeny-Carman model; combining non-steady-state seepage, slip effect, distribution function, molecular free path and the improved Kozeny-Carman model to obtain a poroperm relationship model between the permeability and effective porosity of the gas drive reservoir of the oil reservoir type gas storage; fitting the calculation results of the poroperm relationship model with measured data, and determining the lower limit of the gas drive reservoir parameters according to the fitting results. The method supplements the deficiency that the traditional gas storage evaluation does not consider the gas drive process when applied to the evaluation of the oil reservoir type gas storage, and has good applicability to the oil reservoir type gas storage containing the gas drive process.
Need to check novelty before this filing date? Find Prior Art