Heterogeneous cementing core model with high-permeability layer and preparation method thereof

Abstract

The invention relates to a heterogeneous cementing core model with a high-permeability layer and a preparation method thereof. The core model is a sandwich structure formed by sandwiching the high-permeability layer between two substrate layers, wherein the high-permeability layer is prepared by mixing rock particles, epoxy resins, an additive and solid sodium chloride particles; the substrate layers are prepared by mixing the rock particles, the epoxy resins and the additive. The preparation method of the core model comprises the following steps of: breaking natural cores and grinding the natural cores into rock particles; grinding solid sodium chloride into solid sodium chloride particles; mixing the rock particles, the epoxy resins and the additive and putting the mixture into a mould to prepare one substrate layer; mixing the rock particles, the epoxy resins, the additive and the solid sodium chloride particles and putting the mixture into the mould to form the high-permeability layer on the substrate layer; mixing the rock particles, the epoxy resins and the additive and putting the mixture into the mould to form the other substrate layer on the high-permeability layer, thus obtaining a primary blank; moulding the primary blank by compression and standing for three days, thus obtaining the core model.

Description

technical field [0001] The invention relates to a heterogeneous cemented rock core model with a high permeability layer and a manufacturing method thereof, belonging to the technical field of petroleum drilling and production engineering. Background technique [0002] With the deepening of oilfield development, the comprehensive water cut of China's continental oilfields has been increasing year by year, the high-permeability oil layers have serious water production, and the production potential of low-permeability oil layers is difficult to realize. In the channeling channel, the injected water enters the production well along the channeling channel, forming an invalid circulation, the water cut rises rapidly, and the production decreases. Therefore, profile control to improve the injection water profile has become a top priority. [0003] Slow swelling granular profile control agent is a widely used profile control agent. Before field application, the reservoir applicabili...

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Problems solved by technology

[0003] Slow swelling granular profile control agent is a widely used profile control agent. Before field application, the reservoir applicability of the profile control agent should be fully studied in the laboratory. The current experimental method, whether using quartz sand Whether the filling model or the artificial cementing model is used, there is a situation that the injection cannot be performed. The main reason is that under the reservoir conditions, there is an ultra-high permeability layer formed by high-strength water injection in the near-wellbore zone. There is no ultra-high permeability zone in the quartz sand-filled core, so the expanded gel particles of slow-expanding particles can only be blocked at the entrance and cannot enter the core.

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