Analysis method for oil enhancing production mechanism of weak-based ASP flooding

Abstract

The invention, which belongs to the technical field of petroleum reservoir exploration, particularly relates to an analysis method for an oil enhancing production mechanism of weak-based ASP flooding. The analysis method comprises an emulsification oil enhancing production mechanism analysis method, a solvent water oil enhancing production mechanism analysis method, and an injection-mode oil enhancing production mechanism analysis method. According to the emulsification oil enhancing production mechanism analysis method, on the condition of the same oil-displacing agent viscosity and same slug dimension, a polymer solution and weak-based ASP system seepage characteristic experiment is carried out in an unsaturated oil state of a core; and a polymer solution and weak-based ASP system oil displacement efficiency experiment is carried out in a saturated oil state of a core. According to the solvent water oil enhancing production mechanism analysis method, on the condition of the same oil-displacing agent viscosity and same slug dimension, a weak-based ASP flooding oil displacement efficiency experiment of sewage and a weak-based ASP system oil displacement efficiency experiment of descaling water are carried out respectively. And according to the injection-mode oil enhancing production mechanism analysis method, on the condition of the same oil-displacing agent viscosity and same slug dimension, a weak-based ASP system oil displacement efficiency experiment of sewage and a weak-based ASP system oil displacement efficiency experiment of descaling water are carried out respectively by means of constant-speed displacement injection; and a weak-based ASP system oil displacement efficiency experiment of sewage and a weak-based ASP system oil displacement efficiency experiment of descaling water are carried out respectively by means of constant-pressure displacement injection.

Description

Technical field: [0001] The invention belongs to the technical field of oil reservoir development, and in particular relates to an analysis method for the oil-increasing mechanism of weak alkali three-element compound flooding. Background technique: [0002] Weak alkali ASP flooding is another industrialized application of greatly enhanced oil recovery technology after polymer flooding in Daqing Oilfield, which has made an important contribution to the oilfield's "oil stabilization and water control". Although this technology has been put into industrial application, the factors affecting the oil-increasing effect of the weak base ternary compound, especially the emulsification and its mechanism of action, are still receiving great attention. Existing studies are all focused on the emulsification characteristics of the weak base / petroleum sulfonate / polymer ternary composite system and crude oil and its influencing factors. There is no comparison with a polymer solution with ...

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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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