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A method for effectively improving polymer flooding effect in high permeability and high water-cut reservoirs

A polymer, polymer solution technology, used in earthmoving, wellbore/well components, measurement, etc., to achieve the effect of enhancing adaptability

Active Publication Date: 2019-08-02
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, these two problems are the main problems that have been puzzling polymer flooding to further enhance oil recovery.

Method used

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  • A method for effectively improving polymer flooding effect in high permeability and high water-cut reservoirs
  • A method for effectively improving polymer flooding effect in high permeability and high water-cut reservoirs
  • A method for effectively improving polymer flooding effect in high permeability and high water-cut reservoirs

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Embodiment Construction

[0022] The technical solutions of the present invention will be further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0023] A method for effectively improving the effect of polymer flooding in high-permeability and high-water-cut reservoirs of the present invention comprises the following steps:

[0024] Step 1. Determine the reservoir conditions. The crude oil viscosity is 25mPa s, the reservoir heterogeneity is serious, the temperature is about 65°C, the permeability is about 2000mD, and the porosity is about 30%. After long-term production and development, the reservoir The overall water cut reaches 80%-90%, and there are many undeveloped blocks, basically forming water drive channeling channels. Clay mineral content is about 5%, mainly chlorite, illite, etc.;

[0025] Step 2. According to the above reservoir conditions, establish a corresponding core model, and establish an experimental platform for simulating oil d...

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Abstract

The invention discloses a method for effectively improving the high-seeping and high-water-content oil deposit polymer flooding effect. The method comprises the following steps of determining an oil deposit condition; building a corresponding core model according to the oil deposit condition, and building an experimental platform for simulating oil deposit flooding oil production; measuring the apparent viscosity of a polymer; conducting a percolation characteristic experiment to analyze the resistance coefficient and the residual resistance coefficient of the polymer in a porous medium; calculating the recovery efficiency improvement amplitude of a polymer solution; building a correlation graph of the solution viscosity, the residual resistance coefficient and the recovery efficiency improvement amplitude; analyzing the relation of the influence of the apparent viscosity and the residual resistance coefficient on the recovery efficiency improvement amplitude; judging the amplitude of the influence of the apparent viscosity and the residual resistance coefficient on the recovery efficiency improvement amplitude to thus determine the performance requirement for a polymer system under an oil deposit condition. The method for effectively improving the high-seeping and high-water-content oil deposit polymer flooding effect improves the adaptability of the polymer solution in the oil deposit.

Description

technical field [0001] The invention belongs to the technical field of petroleum processing, and relates to a method for effectively improving the effect of polymer flooding in high-permeability and high-water-cut reservoirs. Background technique [0002] In the secondary development of oil reservoirs in my country, more than 90% of them adopt water injection development. Long-term water injection production causes the rock particles in the porous medium in the formation to migrate, further increases the heterogeneity of the oil reservoir, and forms a strong water flow channel. , seriously affecting the sweeping ability of subsequent water injection. Therefore, modified water flooding technology will be used in the late stage of high water cut in the reservoir to further improve the sweep efficiency and oil displacement efficiency. [0003] Reservoirs with high permeability, serious heterogeneity, and high crude oil viscosity are in the high water cut period after water inje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B47/00
CPCE21B43/16E21B47/00
Inventor 叶仲斌朱诗杰施雷庭舒政陈洪王琰晋清磊
Owner SOUTHWEST PETROLEUM UNIV
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