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A method for studying the dynamic change of pore-throat structure in tight sandstone

A dynamic change, tight sandstone technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of high cost, long cycle, unsuitable for low-permeability tight reservoirs, etc., and achieve the effect of saving cost and time

Active Publication Date: 2019-04-16
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The experimental research on the dynamic change of pore-throat structure is currently mainly concentrated on the medium-high permeability reservoirs of Daqing Oilfield and Shengli Oilfield. Using cores to study the changes in pore-throat structure, this method is not only costly and long-period, but also not suitable for low-permeability tight reservoirs

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  • A method for studying the dynamic change of pore-throat structure in tight sandstone
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  • A method for studying the dynamic change of pore-throat structure in tight sandstone

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Embodiment

[0057] This embodiment provides a method for studying the dynamic change of tight sandstone pore-throat structure, the method includes the following steps:

[0058] 1. Preparation of rock core;

[0059] Natural cores are drilled and numbered;

[0060] Cut the core and grind the end face to ensure that the core diameter is 25mm and the length is between 60-70mm;

[0061] Use a Soxhlet extractor to wash the oil for a period of one to two months. During this period, use a UV analyzer to check the 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 the oil until it is clean;

[0062] 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;

[0063] The length of the core was measured with a vernier caliper to be ...

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Abstract

The invention provides a method used for studying tight sandstone pore-throat structure dynamic change. The method comprises following steps: rock core is prepared; the porosity and the permeability of rock core is measured via gas measuring; the rock core is slabbed, and an obtained rock core column plug is subjected to constant-rate mercury injection experiment; the rest rock core is subjected to simulated formation water flow experiment, and constant pressure displacement of a certain pore volume is carried out; then the permeability of the rock core is measured again via gas measuring, and constant-rate mercury injection experiment of the rock core is carried out for a second time, so that pore distribution characteristics and pore throat distribution characteristics are obtained via the two times of constant-rate mercury injection experiment, and study on tight sandstone pore-throat structure dynamic change is completed. The method can be used for stimulating the pore-throat structure dynamic change of tight sandstone reservoir rock in long term waterflood development process, and studying the change of parameters of the dynamic change.

Description

technical field [0001] The invention relates to an experimental measurement method for the dynamic change of the pore-throat structure of tight sandstone reservoirs during the development process in oil and gas exploration and development technology, and belongs to the technical field of oil exploitation. Background technique [0002] Pore-throat structure is an important basic data in the process of oilfield development. According to different experimental testing methods, the research methods of pore-throat structure can be divided into direct method and indirect method. Direct methods include casting thin sections, scanning electron microscopy, CT scanning, etc.; indirect methods are mainly high-pressure mercury intrusion and constant-speed mercury intrusion. [0003] At present, the research on the characteristics of pore-throat structure mainly focuses on the study of the static pore-throat structure. Usually, the core is taken out of the formation during the drilling ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00
CPCG01N33/00
Inventor 刘广峰白耀星顾岱鸿何顺利王文举王瀚潘少杰高星星刘宗科李雪娇何浩铎赵文海于皓刘畅
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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