Method for correcting Klinkenberg permeability of tight sandstones based on pore-throat structures

A technology of Kjeldahl permeability and correction method, applied in the field of correction of tight sandstone Kjeldahl permeability, can solve the problems of difficult realization, time-consuming, small net outlet pressure difference, etc.

Active Publication Date: 2017-03-22
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this method requires more than ten sets of data to be measured during the measurement process, which is time-consuming. At the same time, the net outlet pressure difference is required to be small and fluctuate within a small range, which is not easy to achieve in actual measurement.

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  • Method for correcting Klinkenberg permeability of tight sandstones based on pore-throat structures
  • Method for correcting Klinkenberg permeability of tight sandstones based on pore-throat structures
  • Method for correcting Klinkenberg permeability of tight sandstones based on pore-throat structures

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Embodiment

[0058] This embodiment provides a correction method for tight sandstone K-permeability based on pore-throat structure, and the correction method specifically includes the following steps:

[0059] 1. Preparation of rock core;

[0060] Drill the natural core and number it; cut the core and grind the end surface to ensure that the core diameter is 25mm and the length is between 60-70mm; use a Soxhlet extractor to wash oil for a period of one to two months, and use a UV analyzer to check during the period Oil washing effect, if the core is not washed, it will emit white fluorescence when soaked in 365nm ultraviolet light, in this case continue to wash oil until it is washed;

[0061] Dry the rock sample to constant weight, the temperature is controlled at 104°C, and the drying time is not less than 8 hours. After 8 hours, weigh once every 1 hour, and the difference between the two weighings is less than 10mg;

[0062] Measure the core length with a vernier caliper;

[0063] 2. ...

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Abstract

The invention provides a method for correcting Klinkenberg permeability of tight sandstones based on pore-throat structures. The method comprises the following steps: preparing a rock core; selecting different pressure points to obtain gas log permeability of the rock core; obtaining the Klinkenberg permeability of the rock core according to the gas log permeability of the rock core; carrying out a high-pressure mercury injection experiment on the rock core to obtain displacement pressure of the rock core, saturation median pressure, a saturation median radius, a pore-throat radius average value and maximum mercury feeding saturation; classifying the pore-throat structures according to experiment parameters obtained by the high-pressure mercury injection experiment; and carrying out linear fitting of the gas log permeability and the Klinkenberg permeability to obtain a fitting parameter, and carrying out index fitting on a result of the fitting parameter and average pore pressure to obtain a function relation of the Klinkenberg permeability, the average pore pressure and the gas log permeability o, so as to finish correction of the Klinkenberg permeability of the tight sandstones based on the pore-throat structures.

Description

technical field [0001] The invention relates to a method for correcting tight sandstone K-permeability based on pore-throat structure, and belongs to the field of reservoir rock physical property evaluation. Background technique [0002] Permeability is an indicator of the ability of a reservoir to pass through, and its size is an important parameter for the classification and evaluation of reservoirs. At present, researchers often use gas permeability to characterize the seepage capacity of reservoirs. However, due to the existence of gas slippage effect in tight reservoirs, the permeability measured with different gases and under different pressures is different. It brings great trouble to the study of tight reservoirs. [0003] Aiming at the problems existing in the steady-state gas permeability test, Jones (Jones, S., 1972.A rapidunsteady-state Klinkenberg permeameter.Soc.Pet.Eng.J.383-397.) proposed a simple, unsteady The K-permeability, slip factor, and turbulence co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/082
Inventor 刘广峰白耀星顾岱鸿何顺利王文举潘少杰朱贤峰刘宗科李雪娇何浩铎于皓赵文海刘畅
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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