A Method for Evaluation of Non-uniform Acid Etching Parameters of Rock Slabs

Abstract

The invention discloses a rock beam nonuniform acid etching parameter evaluation method. The method comprises the following steps: cutting and marking a rock beam to be analyzed according to needed dimensions, then placing the rock beam on a reference plate on a work platform of an acid etching rock beam three-dimensional laser scanner, and fixing the rock beam well by use of a special clamp; starting a switch button, opening a laser head, emitting a line laser, completely covering the rock beam from the left to the right, and performing laser scanning from the front to the back, wherein the width of the line laser is greater than the width of the whole rock beam; and then taking the rock beam down for carrying out an acid etching experiment, drying and cleaning the rock beam after the experiment, then placing the rock beam on the work platform again, and repeating the previous scanning step, uploading data after scanning is completed to an industrial control computer, data processing software drawing a two-dimensional graph and a three-dimensional graph according to the data, and through the data before and after the scanning, calculating parameters needed for acid etching reaction evaluation. According to the invention, linear scanning is employed, and there are no accumulated errors in a transverse direction; and graphs are generated through measured three-dimensional point data, and a surface corrosion height, volume and the like are quantitatively analyzed.

Description

technical field [0001] The invention relates to a method for sampling and evaluating the size effect of the surface dissolution coefficient of a structural surface, in particular to a method for evaluating the parameters of the dissolution volume and height of the non-uniform structural surface after the carbonate rock slab is acid-etched. Background technique [0002] At present, nearly 60% of the world's oil and gas production comes from carbonate rock reservoirs, which account for about 50% of the total number of oil and gas fields. In the development of such oil and gas fields, in order to increase oil and gas production, it is often necessary to carry out acidizing and fracturing operations on the bottom layer. Formation fractures open or widen. In the process of acidizing pressure, because the acid liquid has inhomogeneous corrosion on the surface of the carbonic acid surface, it is guaranteed that after the fracturing operation is over, when the rock fractures lose pr...

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Problems solved by technology

However, the focus of these documents is mainly theoretical research, and the experimental objects often need to use field experiments, which have problems such as high experimental costs, difficult parameter acquisition, and many uncontrollable factors, which are not conducive to rapid acquisition of required data and cannot form 3D graphics.

[0005] However, the existing rock sample surface coefficient detection methods generally use contact acquisition, which is easy to cause damage to the rock surface. At the same time, the scanning measurement accuracy is poor. Using single-point scanning, only one point can be scanned at a time, and the scanning time is long. After scanning, manual data processing is also required. A small number of optical measurement methods also use single-point scanning. There are horizontal cumulative errors in the results of multiple single-point scanning, and the final measurement accuracy is very different from the real result. difference, can not meet the measurement requirements

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