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A method and device for determining the recovery degree of oil in rock

A recovery degree and core technology, which is applied in the field of reservoir development, can solve the problems of low accuracy and insufficient consideration of the recovery degree of oil in water-wet tight rock cores, so as to achieve accurate recovery degree, improve accuracy, and improve The effect of extraction degree

Active Publication Date: 2021-06-01
PETROCHINA CO LTD
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  • Application Information

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Problems solved by technology

However, this type of model does not fully consider the unique micro-nano microscopic pore structure characteristics of tight cores, which may lead to low accuracy in determining the degree of oil recovery in water-wet tight cores, making it difficult to accurately select a reasonable pore structure. Displacement differential pressure

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  • A method and device for determining the recovery degree of oil in rock
  • A method and device for determining the recovery degree of oil in rock
  • A method and device for determining the recovery degree of oil in rock

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Embodiment Construction

[0047] Embodiments of the present application provide a method and device for determining the degree of oil recovery in rocks.

[0048] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0049] The embodiment of the present application provides a method for determining the recovery degree of oil in the rock. The method for determining the degree of oil recovery in the core provides capillary bu...

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Abstract

The embodiment of the present application discloses a method and a device for determining the recovery degree of oil in a rock. The method includes: determining the target capillary radius of a single capillary in the capillary bundle based on the initial capillary radius distribution data; wherein, the target capillary radius is used to characterize the effective flow of the fluid in the single capillary under a specified displacement pressure difference The radius of the channel; based on the target capillary radius, determine the degree of oil recovery in a single capillary under a specified displacement pressure difference; according to the degree of oil recovery in each single capillary in the capillary bundle under a specified displacement pressure difference, determine the The degree of oil recovery in the capillary bundle under pressure difference is used as the degree of oil recovery in the rock. The technical solution provided by the embodiment of the present application can improve the accuracy of the determined degree of oil recovery in the rock.

Description

technical field [0001] The present application relates to the technical field of oil reservoir development, in particular to a method and device for determining the degree of oil recovery in rocks. Background technique [0002] China is rich in tight oil resources, and the preliminary evaluation of tight oil resources in major basins is 8-10 billion tons. Tight oil will become an important replacement resource. In order to achieve high-efficiency commercial development of tight oil reservoirs, it is necessary to adopt staged fracturing technology for large-scale horizontal wells, inject "Wanfang Water" and "break up the reservoir", shorten the seepage distance between fractures and matrix, and achieve the effect of stimulation stimulation. [0003] The current mine field test results show that tight oil reservoirs do not flow back after pressure, and the water storage rate of the reservoir can be increased by stopping the pump for a period of time, and then relying on the di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B47/00G06Q50/02
CPCE21B47/00E21B49/00G06Q50/02
Inventor 江昀石阳杨贤友许国庆王萌韩秀玲曾星航
Owner PETROCHINA CO LTD
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