Artificial core preparation method for irregular natural fractures in oil-water well cement sheath

Abstract

The invention relates to the technical field of oilfield chemistry, in particular to an artificial core preparation method for simulating irregular natural fractures in a cement sheath of a water well containing ternary composite flooding, and solves the problems of uncontrollable direction and distribution of fractures in cement rock samples, poor fracture connectivity and difficulty in simulation real problems on the spot. The steps are: 1. After the heavy cement slurry is solidified, it is broken into pieces of cement with appropriate volume and irregular shape; 2. Heat and melt the vaseline and immerse the cement pieces in the vaseline solution, so that the vaseline is wrapped on the surface of the cement block; 3. Treat the Put the pasted cement fragments into the mold, and inject light cement slurry into it; 4. After the cement slurry is solidified in the mold, heat it again to melt the vaseline inside, and the vaseline seeps out to form irregular cracks; 5. Form the mold into The cement sheath crack channeling model of the invention is cast with epoxy resin, and interfaces are left at both ends of the pouring model; the invention can form cement sheath channeling cracks in various forms, which are used for oil well cement sheath channeling simulation experiments in laboratories.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a simulated ternary containing [0002] A method for preparing artificial cores of irregular natural fractures in a cement sheath of a composite flooding oil-water well. Background technique [0003] With the deepening of the development stage of ASP flooding in oilfields, the damage of oil and water wells is very common. Due to the long service life of the oil well casing, cracks or perforations in the cementing cement sheath make it impossible to completely seal the oil layer casing, resulting in serious oil well leakage and affecting the further development and production of the oil field. [0004] In order to conduct laboratory experiments to effectively simulate the channeling of ASP flooding produced fluid in oil well cement sheath fractures, and to study the plugging effect of the plugging agent system on cement sheath fractures, it is now necessary to develop ...

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Problems solved by technology

[0007] The present invention overcomes the problems of uncontrollable direction and distribution of cracks in cement rock samples, poor connectivity of cracks and difficulty in simulating field practice, and solves the problem that rock samples with irregular shapes but controllable cracks of other parameters cannot be provided for laboratory experiments. Artificial core preparation method for simulating irregular natural fractures in the cement sheath of ASP flooding water wells to meet the needs of indoor ASP flooding water well plugging simulation experiments

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