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Oil displacement binary composite system formula optimization method based on pore throat radius suitability

A technology of binary composite and pore throat radius, which is applied in the field of formulation optimization of polymer-surfactant or polymer-alkali binary composite system for oil displacement, which can solve the problem of less research on binary system and lack of effective and fast formulation optimization methods. The means and steps are cumbersome and other problems, so as to achieve the effect of easy operation.

Active Publication Date: 2021-11-09
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, at present, in the formulation design optimization of the binary compound system, the formulation optimization method between surfactant / alkali and polymer still lacks effective and quick means
[0006] At present, there are few laboratory test studies on the suitability of pore throat radius for binary systems, and most of them are limited to the situation of single system (that is, a single polymer flooding system). The experimental steps of permanent injectivity are cumbersome, consume more manpower and material resources, the evaluation results are not universal, and it is not convenient for large-scale application in oil field

Method used

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  • Oil displacement binary composite system formula optimization method based on pore throat radius suitability
  • Oil displacement binary composite system formula optimization method based on pore throat radius suitability
  • Oil displacement binary composite system formula optimization method based on pore throat radius suitability

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Embodiment 1

[0029] The polymers used in this example are partially hydrolyzed polyacrylamides with molecular weights of 700, 1000, 1500, 19 million and 23 million respectively, and the surfactant is sodium dodecylbenzenesulfonate.

[0030] The formula optimization method of the binary compound system, the steps are as follows:

[0031] Step S1, prepare partially hydrolyzed polyacrylamide with a molecular weight of 7 million, the concentration is 500, 1000, 1500, 2000, 2500, 3000 mg / L, and the corresponding concentration of sodium dodecylbenzenesulfonate is 500, 1000 mg / L for each polymer concentration , 1500, 2000, 2500, 3000mg / L binary composite system solutions, and measure the hydrodynamic radius R of each binary composite system h ,Specific steps are as follows:

[0032] ① Use distilled water to prepare various binary composite system solutions, stir with an electric stirrer to fully dissolve the polymer, measure the initial viscosity of the binary composite system solution, and then...

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Abstract

The invention discloses an oil displacement binary composite system formula optimization method based on pore throat radius suitability, which comprises the following steps: S1, preparing a series of polymer-surfactant / alkali binary composite system solutions with different polymer concentrations and surfactant / alkali concentrations, and measuring the hydrodynamic radius Rh of each composite system; S2, determining a minimum pore throat radius Rm matched with the hydrodynamic radius Rh according to a bridging theory, and drawing a polymer concentration-surfactant concentration / alkali concentration-minimum pore throat radius plate; S3, drawing a polymer concentration-surfactant concentration / alkali concentration-minimum pore throat radius plate for different polymers; and S4, according to the pore throat radius of the target oil reservoir, comparing the polymer concentration-surfactant concentration / alkali concentration-minimum pore throat radius plate, considering the viscosity of the composite system, and optimizing and selecting a polymer-surfactant / alkali composite system formula. According to the method, the optimal formula of the surfactant / alkali and the polymer can be quickly and effectively optimized.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a polymer-surfactant or polymer-alkali binary composite system formula optimization method for oil displacement based on the adaptability of pore throat radius. Background technique [0002] Binary compound flooding is a new technology for enhanced oil recovery developed in the 1980s. It is a kind of oil displacement technology composed of alkali or surfactant and polymer. There are many types of chemical agents involved in binary compound flooding, and it is necessary to select appropriate chemical agents according to the actual characteristics of the target reservoir. [0003] At present, the research on the binary composite system is developing rapidly. Based on the synergistic effect of chemical agents, adding a certain concentration of high molecular weight water-soluble polymer solution can reduce the water-oil mobility ratio and expand the swept volume. By ad...

Claims

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Application Information

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IPC IPC(8): G16C10/00G06T11/20
CPCG16C10/00G06T11/203G06T11/206
Inventor 施雷庭曾志伟陈灿王睿麒张玉龙朱珊珊叶仲斌
Owner SOUTHWEST PETROLEUM UNIV
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