A method for analyzing the oil-increasing mechanism of weak alkali ASP flooding

Abstract

The invention belongs to the technical field of oil reservoir development, and in particular relates to an analysis method for the oil increase mechanism of weak alkali three-element compound flooding, including emulsification, solvent water and injection methods for oil increase mechanism analysis; 1. In terms of oil displacement agent viscosity and slug Under the condition of the same size, the seepage characteristics experiments of the polymer solution and the weak base three-component compound system were carried out in the unsaturated oil state of the core, and the oil displacement effect of the polymer solution and the weak base three-component compound system was carried out under the saturated oil state of the core. Experiment; 2. Under the condition of the same oil displacement agent viscosity and slug size, carry out the oil displacement effect experiment of sewage weak alkali ASP flooding and descaling water weak alkali ASP system respectively; 3. In the oil displacement agent viscosity and Under the condition of the same slug size, the oil displacement effect experiments of the sewage weak alkali three-component composite system and the descaling water weak alkali three-component composite system were carried out by the constant-speed displacement injection method, and the sewage weak-base three-component composite system was tested by the constant pressure displacement injection method. Oil displacement experiment of three-component compound and descaling water weak base three-component compound system.

Description

Technical field: [0001] The invention belongs to the technical field of oil reservoir development, and specifically relates to a method for analyzing the oil-increasing mechanism of weak alkali ternary combined flooding. Background technique: [0002] The weak-alkali ternary combination flooding is another industrially promoted technology to greatly enhance oil recovery after polymer flooding in Daqing Oilfield, and has made important contributions to the oilfield's "oil stabilization and water control". Although the technology has been put into industrial application, the factors affecting the oil-enhancing effect of the weak base ternary compound, especially the emulsification and its mechanism of action, are still receiving great attention. Existing researches are all focused on the emulsification characteristics and influencing factors between the weak base / petroleum sulfonate / polymer ternary composite system and crude oil. There is no comparison with the polymer solution wit...

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Problems solved by technology

[0003] The present invention aims to overcome the problems that the existing experimental research methods in the background technology are difficult to accurately reflect the contribution of the emulsification of weak alkali ASP flooding to the oil increase effect, and the influence of different solvent water and injection methods on the oil increase effect, and provides a An analysis method for the mechanism of oil increase of weak alkali ASP flooding can provide important technical support for the enhanced oil recovery of weak alkali ASP flooding. It is an analysis method with simple process and obvious technical and economic effects.

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