Optimizing method for parameters of hydraulic fracturing proppant for sandstone reservoir

Abstract

The invention discloses an optimizing method for parameters of a hydraulic fracturing proppant for a sandstone reservoir. The optimizing method comprises the following steps: inputting wellbore data and the like of the sandstone reservoir to be fractured into oil and gas reservoir capacity simulating software, simulating and calculating the reservoir capacity under different fracture parameters todetermine the optimal fracture flow conductivity required by the production of the reservoir; splitting by adopting a real rock plate of a reservoir to form a fracture, acquiring surface rough topographic data of the fracture, then manufacturing a sample preparation mould which is consistent with that the surface rough topographic data, and manufacturing an artificial sandstone rock sample with real fracture surface topography; performing a propped fracture flow conductivity test under different proppant parameters by adopting the artificial sandstone rock sample, and performing comparison analysis on a test result with a simulated calculation result to obtain an optimal proppant parameter which is in accordance with the characteristics of the reservoir. According to the optimizing methodfor the parameters of the hydraulic fracturing proppant for the sandstone reservoir, proppant parameter optimization results can be acquired efficiently and accurately by performing the propped fracture flow conductivity test through adopting the artificial sandstone rock sample which can reflect hydraulic fracturing real fracture surface topography of the sandstone reservoir.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas production stimulation and transformation, in particular to a method for optimizing the parameters of hydraulic fracturing proppant in sandstone reservoir production stimulation and transformation. Background technique [0002] Hydraulic fracturing is the main measure for oil and gas stimulation. During construction, the fracturing fluid with high viscosity is squeezed into the oil and gas reservoir through the wellbore. When this pressure exceeds the fracture pressure of the reservoir rock near the bottom of the well, the reservoir rock will be pushed open and fractures will be generated. In order to keep the fractures opened open, continue to squeeze the sand-carrying fluid with proppant into the reservoir. When the surface pump unit stops and the sand-carrying fluid flows back, the proppant left in the fracture will prevent the fracture from completely closing, keeping the fracture...

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Problems solved by technology

The problem with this method is that the rough surface morphology of different rock samples after splitting is different, and there is a big difference in the conductivity when the same concentration of proppant is filled in it, and the experimental results cannot be used to guide hydraulic fracturing in oilfields; In addition, due to the need to apply a high closure pressure to the rock sample and proppant when carrying out the conductivity test of the propped fracture, it will cause irreversible damage to the rough surface of the rock sample. A pair of split rock samples can only be tested once, and repeated experiments cannot be performed. Therefore, it is impossible to carry out comparative experiments to study the influence of different proppant parameters on the conductivity of propped fractures.

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