Acid rock reaction single-rock-plate crack simulation device and working method thereof

Abstract

The invention relates to an acid rock reaction single-rock-plate crack simulation device and a working method thereof. The core portion of the acid rock reaction single-rock-plate crack simulation device is a visual slab model, the visual slab model comprises a joint plate corrosion clamp holder, a support, a microscope, a rotating device and the like. The invention further provides the working method of the acid rock reaction single-rock-plate crack simulation device. The acid rock reaction single-rock-plate crack simulation device is compact in whole structure, has strong pressure bearing capability, can achieve simulation of the crack acidification situations of different stratigraphic dips (0-90 degrees) through the rotating device and can achieve dynamic observation of earthworm hole growth and extension situations and earthworm hole competition situations.

Description

technical field [0001] The invention relates to an acid-rock reaction single rock slab crack simulation device and a working method thereof, and belongs to the technical field of production increase measures of oil and gas reservoirs. Background technique [0002] Acidizing, as the main technical measure for developing low-porosity and low-permeability carbonate reservoirs, can effectively remove the pollution and clogging of the reservoir near the wellbore, improve the connectivity between the wellbore and the reservoir, and restore or increase oil and gas production. In acidizing, the acid etching results can be divided into surface corrosion, worm hole and uniform corrosion according to the dissolution form. Surface corrosion and uniform corrosion consume more acid and have poor conductivity; wormhole is a kind of corrosion with high conductivity. Dissolution channel, the formation of wormholes consumes less acid, and the transformation effect is good. The dissolved form...

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Problems solved by technology

However, the core displacement experiment has certain limitations: (1) The boundary effect is strongly influenced

[0005] At present, the country has gradually begun to use flat plate experiments to simulate formation acidification construction. There are two types of flat plate devices. One is the rock plate disclosed in the above-mentioned Chinese patent document CN104407103B. The size of the rock plate is small, only 64.5cm 2 , the influence of the boundary effect has been weakened to a certain extent, but basically it can only be used to test the conductivity. The hole growth cannot be directly observed; the rock plate used in the other flat plate model has a larger size, which reduces the probability of the wormhole breaking through to the side edge and solves the boundary effect. At the same time, the device has a better pressure bearing capacity, but There are still the following problems: (1) There is still the problem of poor visibility, the gap between the two slabs is small, it is difficult to effectively observe the experiment dynamically through the side camera, and the growth rate of wormholes cannot be directly calculated. However, the competition between wormholes cannot be effectively analyzed, and the respective growth conditions of main wormholes, secondary wormholes and dead wormholes cannot be visually recorded; (2) It is difficult to process rock slabs, and the size of rock slabs used for experiments is too large However, there is no ready-made processing equipment, resulting in a small number of experimental groups, and only demonstration experiments can be carried out

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