Preparation method of fractured carbonate rock core

Abstract

The invention provides a preparation method of a fractured carbonate rock core. The method includes: mixing evenly carbonate, an inorganic glue and a soluble organic gel powder, laying the mixture on two semicircular cylinder moulds; laying a proppant of a certain particle size on the surface of one of the semicircular cylinder mixture according to the needs; filling soluble organic gel prepared in advance between the proppant; keeping the two semicircular cylinders containing the materials at a constant temperature in a constant temperature box, and preliminarily molding the materials in the semicircular cylinders; and then assembling the two semicircular cylinders into a cylinder; placing the cylinder in a pressurizing device of a core preparation device for pressing, then soaking in distilled water for 20min, taking out, and displacing the soluble organic gel with distilled water to obtain the support crack rock core with certain width. The preparation method of fractured carbonate rock core not only can prepare the fractured carbonate rock core with proppant support, but also can obtain support fractured carbonate rock cores of different widths through selection of proppant size.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for preparing fractured carbonate rock cores. Background technique [0002] In the process of oil and gas field development, many indoor experiments need to use cores, including core flow experiments, core damage experiments, etc. However, the success rate of on-site drilling and coring is low and the cost of coring is high, which greatly increases the cost of experiments, especially for some core experiments on fractured reservoirs, the success rate of coring is lower, and it is difficult to obtain cores with fractures . For this kind of core experiment, especially for the experiment of studying the plugging strength of temporary plugging agent under different fracture widths, it is necessary to obtain cores with different fracture widths, which are almost impossible to obtain on-site drilling and coring, so it is necessary to artificially create ...

AI Technical Summary

Problems solved by technology

Using the method of mechanical destruction to create fractures, the success rate is low, and the formed fractures are relatively random, which cannot be described by exact parameters; although cutting fractures do not have this defect, the core of the cutting part will be missing, and the original shape cannot be maintained , so the core needs to be filled, but the filler used cannot be exactly the same as the matrix core; moreover, the current artificial cemented core is mostly made of quartz sand, and the production method of carbonate rock artificial core is even rarer. And there are certain deficiencies, such as the fractured carbonate core obtained by making carbonate rock slabs, slotting, and drilling cores still has the disadvantage of cutting and creating fractures, and the fractured carbon core obtained by model pressing and anhydrous ethanol washing Although salt core overcomes the defect of cutting and creating fractures, it cannot control the fracture width and cannot simulate propped fractures

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