Casting method of epoxy resin covered rock core

Abstract

The invention discloses a casting method of an epoxy resin covered rock core. The casting method comprises the following steps: determining a casting material type, wherein materials include an adhesive, a curing agent and a toughening agent; the adhesive is epoxy resin, the curing agent is polyamide resin and the toughening agent is dibutyl phthalate; mixing the adhesive, the curing agent and the toughening agent; uniformly and slowly injecting the mixed materials into a mold with the clamped rock core under the condition that the mold is horizontally arranged, and casting; finally, standing and cooling for 24h; detaching the mold and removing a casting finished product; and carrying out edge and corner polishing and beautifying. According to the casting method of the epoxy resin covered rock core, a manual rock core is subjected to external sealing and casting through the epoxy resin and has a good pressure bearing capability and stable rock core properties; and an application range of the rock cores is widened and displacement pressure is expanded to the use upper limit of 6MPa from the use upper limit of 1.0MPa, so that a foundation is laid for researches of indoor displacement experiments.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a casting method for epoxy resin-wrapped rock cores. Background technique [0002] For the production and development of oilfields, a reasonable development plan / production system is the basis for maintaining efficient production and development. The overall plan is mainly analyzed through numerical simulation, and the basic experimental parameters of indoor experiments are the basis of digital simulation. Therefore, objectively speaking, the accuracy of laboratory experimental data and the regularity of research affect the production and development simulation of the entire reservoir. [0003] Regarding the core model, there are currently two main types, core holder and epoxy resin casting. At present, the vast majority of domestic research institutions use iron core holders with relatively complex structures to hold and seal the cores. The main holder models inclu...

AI Technical Summary

Problems solved by technology

With the diversified development of core experiment displacement, more and more researches need to use larger size cores for physical simulation experiments, such as φ25.4×1000mm, φ38×1000mm, and 45×45×300mm have become physical Simulation model, but this type of size model is operated by a gripper, which has the following problems: ①It is large in size and heavy, which is not easy to handle and unload; The rubber cover is prone to leakage and unstable confining pressure during the experiment, which will lead to the failure of the experiment; ③The flow space of the diversion liquid in the whole mold is relatively large, and non-core seepage data will be generated in the research process of saturated oil and water flooding oil , which affects the experimental results; ④ Due to the large mold, the vacuum method cannot be used to measure the core pore volume, resulting in a relatively large error

The most commonly used cast artificial rock cores on the market, the main problem is that the pressure resistance is not good, and its ultimate pressure bearing capacity is 0.8-1.0MPa, which also limits the wide application of cast artificial rock cores. Among them, Liu Jinqun (a kind of improved epoxy The device of resin casting rock core pressure resistance, publication number: CN203572825U) specially designs clamping model in its patent to improve the pressure resistance capacity of casting rock core model, thereby completes relevant experimental design; For the higher displacement experiment of displacement pressure, Epoxy resin cannot be used to cast core models

[0005] Secondly, artificial cores are usually sintered with epoxy resin + quartz sand + clay minerals, and epoxy resin is also used for casting, as Li Yiqiang indicated in his invention in 2005 (quartz sand epoxy resin cemented core and its preparation method, Publication number: CN 1664547A), which has caused a common effect between the epoxy resin of casting and the epoxy resin of sintered rock core

If the temperature of the cast epoxy resin is too high and the fluidity of the casting process is too strong, it will cause a layer of the outer surface of the core to react with the cast epoxy resin, thereby changing the properties of the core and ultimately affecting the experimental results

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