Optimization method for carbonate reservoir acid fracturing construction parameters

Abstract

The invention discloses an optimization method for carbonate reservoir acid fracturing construction parameters. Oil and gas reservoir capacity simulation software is used for analog computation of thecarbonate reservoir capacity under different crack parameters to determine the optimal crack guide capacity needed by the reservoir production; meanwhile, carbonate reservoir real rock beams are split to form cracks; the surface rough morphology data of the cracks are acquired through three-dimensional laser scanning; then, a rock numerical control carving machine is used for carving the surfacesof the carbonate reservoir real rock beams to obtain carbonate rock artificial rock beams with real crack surface morphology; the acid etching experiments and the acid fracturing crack guide capacitytests under different construction parameters are performed on the carbonate rock artificial rock beams; and testing results and analog computation results are compared and analyzed to obtain the optimal acid fracturing construction parameters meeting reservoir characteristics. The optimization method for the carbonate reservoir acid fracturing construction parameters can achieve experimental results nearer actual construction conditions.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas production stimulation and transformation, in particular to an optimization method for acid fracturing construction parameters in carbonate rock reservoir production stimulation and transformation. Background technique [0002] Acid fracturing is the main measure for stimulation of carbonate rock reservoirs. During construction, fracturing fluid with relatively high viscosity is first squeezed into the reservoir through the wellbore, and high pressure is formed on the bottom hole reservoir by means of the fracturing fluid. Break open reservoir rock and create frac fractures, or open pre-existing natural fractures. Then inject acid liquid into the fracture to produce non-uniform etching on the surface of the fracture, forming acid-etched fractures with a certain conductivity, providing flow channels for fluids, so as to achieve the purpose of improving oil and gas seepage conditions and...

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Problems solved by technology

At present, scholars have carried out experiments by preparing a large number of split rock samples to compare and analyze the effect of acid injection conditions. However, there are certain differences in the surface roughness of different rock samples after splitting, which is very easy to determine the roughness of the crack surface after acid etching. Affected by the shape and its conductivity, thus limiting the accuracy of the experimental results to guide the optimization of acid fracturing construction parameters

A. Suleimenova used the same rock sample to conduct conductivity tests repeatedly. The convex points on the surface are easily broken under the closing pressure, which will seriously affect the results of subsequent experiments, resulting in poor comparison of experimental results, and it is also difficult to effectively guide acid fracturing. Optimization of construction parameters

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