A preparation method and special tool for lateral accretion interlayer artificial core

Abstract

The invention provides a preparation method of a lateral accretion interlayer artificial core and a special tool, mainly aiming at solving the problem that an existing core cannot be used for truly simulating the existence of lateral accretion interlayer in an oil layer. The preparation method consists of the following steps of: preparing a pressing arc plate for a lateral accretion body and installing a mould; accurately calculating quartz sand with different granularities, and adhesive ingredients of a high-permeability layer at the bottom layer of the core and a low-permeability layer of the lateral accretion body; sequentially adding adhesives into all the ingredients and then respectively rubbing evenly; placing the ingredients of the high-permeability layer into the mould for pressurizing and sizing; sequentially placing the ingredients of the low-permeability layer into the lateral accretion body at the upper layer of the high-permeability layer, arranging the pressing arc plate for the lateral accretion body, removing the pressing arc plate after sequentially pressurizing and arranging a lateral accretion interlayer, and arranging a horizontal well according to needs; arranging the core in a constant temperature box for curing; carrying out gelling treatment on the surface of the core; comprehensively arranging a saturated well, an injection and production well and a pressure monitoring well; and carrying out fractionated casting and molding. The existence condition of the lateral accretion interlayer in the oil layer can be well simulated by utilizing the core obtained by the preparation method so as to provide mature and effective technical support for indoor physical experiments.

Description

Technical field: [0001] The invention relates to a method for preparing rock cores used in the field of oil and gas field development, in particular to a method for preparing artificial rock cores with lateral accretion interlayers and equipment specially used for implementing the method. Background technique: [0002] The occurrence of lateral accretion interlayers and pinch-outs in my country's oilfields is relatively common. Lateral accretion interlayers have a significant impact on oilfield development. Because of the existence of lateral accretion interlayers, the well location of injection-production wells and the deployment of horizontal wells all affect the final results. The recovery factor and the distribution of remaining oil are also reflected in the actual development of the site. In the late stage of high water cut in oilfield development, the lower part of the meandering river channel sand body is highly water-flooded. Under the blocking effect of the interlaye...

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Problems solved by technology

However, the current laboratory simulation of lateral accretion interbeds in meandering river sand bodies is still in its infancy, because the cores used in current laboratory oil displacement experiments are mainly homogeneous cores, intra-layer heterogeneous cores and inter-layer heterogeneous cores. There is no mature core interlayer layout method, and it is impossible to truly and effectively simulate the shielding effect of lateral accretion interlayers during the displacement process. Currently, the building structure of meandering river point bar sand bodies can be simulated—New Moon-shaped wedge-shaped oblique type, stepped type and wave type, these three common models have no good solution to the problem of controlling the dip angle of lateral accretion interlayers, and the above core models cannot meet the requirements of indoor lateral accretion interlayer experiments. Due to the requirements of horizontal wells and saturated wells, it is impossible to produce lateral accretion interlayer cores to effectively simulate the recovery process of the remaining oil in the interlayer shielding part, which seriously restricts the practicability and accuracy of lateral accretion interlayer test cores, and restricts the lateral accretion interlayer. Research on Indoor Physics Experiments

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