High-flow-conductivity acid fracturing method for carbonate rock reservoirs
A carbonate rock reservoir and conductivity technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problem of reducing wellbore friction, difficult construction in sanding stage, and fracture conductivity. Reduce and other problems to achieve the effect of increasing the effective distance, improving the effect of acid pressure transformation, and reducing flow resistance
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[0041] This example takes a gas reservoir evaluation well as an example. The reservoir lithology of this gas reservoir well is gray dolomite, the porosity is 1.17%, the permeability is 0.3×10-3μm2, the gas saturation is 45%, and the well temperature is 90°C , the perforated well section is 2641.0-2645.5m, which is a typical tight low-permeability carbonate reservoir, and conventional gas testing has no productivity. In order to expand the venting volume, increase the productivity of a single well, form a deep-penetrating fracture system with high conductivity, and achieve sustained high and stable production in acid fracturing, the following acid fracturing methods are used to stimulate rock reservoirs. The specific operation steps are as follows:
[0042] (1) Acid fracturing construction: Use K344-115 packer to seal the acid fracturing string;
[0043] (2) Pre-acid pretreatment: with a construction pressure of 43.4MPa, 2.0m 3 / min displacement into the pre-acid 10m 3 , carr...
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