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

A technology of natural fractures and artificial cores, which is applied in the field of simulating ternary elements, can solve problems such as poor connectivity of fractures, uncontrollable fracture direction and distribution, and difficulty in simulating the actual site, achieving process safety, low cost, and short cycle time.

Active Publication Date: 2022-07-19
DAQING OILFIELD CO LTD +1
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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

Method used

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

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specific Embodiment approach

[0028] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS: The artificial core preparation method for simulating irregular natural fractures in cement sheaths of water wells containing ternary compound flooding, and its specific implementation steps are as follows:

[0029] a. Preparation of heavy cement slurry: According to the experimental requirements, mix cement (425#), barite powder, clay, quartz sand and water uniformly in the ratio of 4:1:1:1:2 to obtain a denser cement slurry. heavy cement paste;

[0030] b. Preparation of heavy cement blocks: prepare ring-pillar molds (see figure 1 ), smooth the inner wall of the mold and apply butter evenly, and slowly pour the obtained heavy cement slurry into the mold and let it stand, waiting for the cement to solidify;

[0031] c. Making heavy cement particles: Take the solidified annular cement rock sample out of the model, knock the rock sample evenly with a tool to break it, and select from the cement fragments with a volume o...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/36G01N33/38
CPCG01N1/28G01N1/36G01N33/383G01N2001/366
Inventor 刘向斌王力周泉周万富李国吴晨宇刘松梅雷达
Owner DAQING OILFIELD CO LTD
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