Method for predicting start-up pressure gradient of Robertson-Steve fluid in porous medium

A technology of starting pressure gradient and porous media, which is used in measurement devices, instruments, scientific instruments, etc., and can solve problems such as the specific law that cannot reflect the starting pressure gradient of underground reservoirs.

Inactive Publication Date: 2014-05-07
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

[0012] However, the Chinese patent application number CN200910090075.2 can only perform a simple simulation test on the threshold pre

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  • Method for predicting start-up pressure gradient of Robertson-Steve fluid in porous medium
  • Method for predicting start-up pressure gradient of Robertson-Steve fluid in porous medium
  • Method for predicting start-up pressure gradient of Robertson-Steve fluid in porous medium

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Embodiment Construction

[0035] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and / or" includes any and all combinations of one or more of ...

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Abstract

The method discloses a method for predicting the start-up pressure gradient of Robertson-Steve fluid in a porous medium. The method comprises the following steps: a, providing a sample of the porous medium, and measuring the porosity (phi) and the particle radius (R) of the porous medium; b, calculating structure parameters of the porous medium in a fractal model according to the porosity (phi) and the particle radius (R) of the porous medium; c, measuring characteristic parameters of the Robertson-Steve fluid, wherein the characteristic parameters include a dynamic viscosity coefficient (mu), an initial shear rate (C), a rheological index (n), surface tension (T) and a solid-liquid contact angle (theta); and d, according to the structure parameters of the porous medium and the characteristic parameters of the Robertson-Steve fluid, calculating the start-up pressure gradient (Lambda) of the Robertson-Steve fluid. The method for predicting the start-up pressure gradient of the Robertson-Steve fluid in the porous medium can reflect the specific rule of the start-up pressure gradient of the Robertson-Steve fluid in the porous medium.

Description

【Technical field】 [0001] The present invention relates to a method for predicting the start-up pressure gradient of crude oil in porous media (underground rock), in particular to a prediction method for the start-up pressure gradient of crude oil in porous media (underground rock) of Robertson-Steve fluid type method. 【Background technique】 [0002] Porous media can be divided into natural porous media and artificial porous media. Natural porous media can be further divided into underground porous media and biological porous media, the former such as rocks and soil; the latter such as microvascular networks and tissue gaps in human and animal bodies, as well as roots, stems, branches and leaves of plants. [0003] The pores inside porous media are extremely small. The pore diameters of sandstone formations that store oil and natural gas are mostly between less than 1 micron and 500 microns; the inner diameter of capillaries is generally 5-15 microns; the pore diameter of t...

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Application Information

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IPC IPC(8): G01N13/04
Inventor 员美娟
Owner WUHAN UNIV OF SCI & TECH
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