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A Method for Determining Relative Gas Permeability of Tight Gas Reservoirs

A relative permeability and determination method technology, which is applied in the field of oil and gas reservoir development, can solve the problems of time-consuming, gas relative permeability correction, slippage effect, etc.

Active Publication Date: 2020-06-12
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, this method takes a lot of time in the steady-state measurement process, and does not consider the slippage effect, and does not correct the relative gas permeability, which is prone to large errors

Method used

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  • A Method for Determining Relative Gas Permeability of Tight Gas Reservoirs
  • A Method for Determining Relative Gas Permeability of Tight Gas Reservoirs
  • A Method for Determining Relative Gas Permeability of Tight Gas Reservoirs

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Embodiment 1

[0068] This embodiment provides a method for determining the relative gas permeability of tight gas reservoirs, which may include the following steps:

[0069] 1. Core preparation

[0070] In order to simulate reservoir conditions in the laboratory, the experimental temperature is set at 25°C-90°C, and the experimental confining pressure is 2.35MPa-50.00MPa.

[0071] The gas permeability, porosity and geometric parameters of the six core samples used in the experiment are listed in Table 1. The gas permeabilities in Table 1 were measured by using gas (nitrogen) under laboratory conditions.

[0072] The steps for measuring porosity are as follows: (1) Dry the rock sample at 110°C for 8 hours; (2) Weigh the dried rock sample; (3) Make the rock sample vacuum; (4) Saturation with synthetic brine Vacuum the rock samples, and weigh the wet rock samples; (5) Calculate the porosity by using the difference in weight between the dry and wet rock samples.

[0073] Table 1

[0074] ...

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Abstract

The invention provides a method for determining the gas relative permeability of a tight gas reservoir. The determining method comprises the steps that the klinkenberg permeability and the gas measurement permeability of a core are determined correspondingly under different confining pressure conditions; the klinkenberg permeability and the gas measurement permeability are subjected to linear fitting to obtain the fitting parameter; the confining pressure is subjected to linear fitting according to the fitting parameter, and the functional relationship between the fitting parameter and the confining pressure is obtained; the corrected klinkenberg permeability is obtained according to the functional relationship between the fitting parameter and the confining pressure; and the gas relativepermeability is obtained according to the corrected klinkenberg permeability. According to the method for determining the gas relative permeability of the tight gas reservoir, the slip effect is considered.

Description

technical field [0001] The invention relates to a method for determining the gas permeability of tight gas reservoirs considering the slippage effect, and belongs to the technical field of oil and gas reservoir exploitation. Background technique [0002] The relative permeability is usually used to characterize the pore structure, saturation distribution and wettability of the reservoir, and the gas-water phase permeability can characterize the relative flow capacity of gas and water in the reservoir. Therefore, it is very important to accurately obtain the relative permeability of gas and water under different conditions to better understand the internal laws of gas flow in the reservoir. [0003] Gas relative permeability has gained a lot of attention in the past few decades. Due to the slippage effect in low-permeability rock cores, many efforts have been made to measure the gas permeability and gas relative permeability under the slippage effect theoretically and experi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/082
Inventor 刘广峰顾岱鸿刘宗科李思颖何顺利田冷张红玲冯波夏宇赵启梦罗大用王健宁王奕璇殷航张腾换
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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