Step Calibration Method of Slab Surface Scanning Data in Acid Etching Physical Simulation Experiment
A technology of physical simulation and scanning step size, which can be used in earth-moving drilling, mining fluids, measuring devices, etc. It can solve problems such as the size effect of scanning step size, and achieve the effect of accurately characterizing parameters.
Active Publication Date: 2017-07-04
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
[0005] However, there is a serious problem in the calculation process of the parameters characterizing the roughness of the fracture surface (hereinafter collectively referred to as the characterization parameters)—the scanning step size effect
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[0039] Further illustrate the present invention according to accompanying drawing below.
[0040] Firstly, the "size effect" will be described in detail with reference to the accompanying drawings. Such as figure 1 , figure 2 , image 3 As shown, between point A and point B is any curve on the rough surface of the rock slab, and the black point is a point selected equidistantly between point A and point B, and the distance between two adjacent points is ΔL. Next, the length of the curve segment between A and B is approximately calculated according to different scan step lengths.
[0041] 1) When the scan step size is ΔL
[0042] Such as figure 1 As shown, take the scanning step length as ΔL, and calculate the length of the curve segment between A and B as L 1 (that is, the length of the zigzag line segment between A and B in the figure).
[0043] 2) When the scan step size is 2ΔL
[0044] Such as figure 2 As shown, take the scanning step as 2ΔL, and calculate the leng...
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The invention discloses a step calibration method for rock plate surface scanning data in an acid etching physical simulating experiment. The step calibration method comprises the steps of (A) setting the initial scanning step of a three-dimensional laser scanner to 0.01mm; (B) scanning a smooth and flat rock plate surface which is not etched by an acid by means of the three-dimensional scanner for acquiring three-dimensional data of the rock plate surface; (C) calculating the average deflection ratio epsilon<-> of the rock plate surface by means of three-dimensional data in the step (B); (D) calculating the relative error [the absolute value of epsilon<->-1] by means of the average defection ratio epsilon<-> which is obtained in the step (C); and (E) changing the scanning step in a manner of adding 0.1mm each time; and successively repeating the step (B), the step (C) and the step (D) until the value of the calculated [the absolute value of epsilon<->-1] is smaller than 0.0001, and the scanning step when the [the absolute value of epsilon<->-1] is just smaller than 0.0001 is an optimal scanning step. The step calibration method has an advantage of reliable principle and furthermore can supply an appropriate scanning step for calculation of a characterization parameter.
Description
technical field [0001] The invention relates to a method for calibrating the step length of rock slab surface scanning data in the field of petroleum, in particular to acid etching physical simulation experiments in the field of acid fracturing. Background technique [0002] Acid fracturing (acid fracturing for short) is the main measure for oil and gas stimulation, which is mainly to inject acid liquid (or pre-fluid) into the reservoir under the condition of higher than the fracture pressure of oil and gas reservoirs or the closure pressure of natural fractures. New artificial fractures are formed in the reservoir or natural fractures are opened, and the injected acid solution causes non-uniform etching on the surface of the fractures. After the acid flowback, due to the rough surface of the fracture, the convex part of the surface keeps the fracture open to a certain extent under the closing pressure, thereby forming a fracture that provides a flow space for the fluid and ...
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IPC IPC(8): G01B11/30E21B43/27
Inventor 郭建春白翔卢聪苟兴豪罗波
Owner SOUTHWEST PETROLEUM UNIV