METHOD FOR DETERMINING CONDUCTIVITY DISTRIBUTION OF ACID-FRACTURED FRACTURE OF CARBONATE ROCK OIL AND GAS RESERVOIR BY EXPERIMENTATION

摘要

A method for determining the conductivity distribution of acid-fractured fractures of a carbonate rock oil and gas reservoir by experimentation, comprising: simulating, by means of the acid-fracturing simulator, FracproPT, the extension of acid-fractured fractures and an acid-etching process under a well during an acid-fracturing process, and obtaining, along the direction of the length of hydraulic fractures, the data of fracture width distribution, fracture height distribution, temperature distribution, and acid liquid mass concentration distribution; selecting, in the direction of the length of hydraulic fractures, ten feature points of which the acid liquid mass concentrations are respectively 100%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%, 10% of the initial mass concentration, and obtaining data of fracture width, fracture height, and temperature of the ten feature points; converting an injected acid discharging rate of an oil field site scale into an injected acid discharging rate of a laboratory scale; preparing an acid liquid for experiment, on the basis of the data of the acid liquid mass concentrations of the ten features points; simulating the acid-etching process, testing, by experimentation, the conductivity of the reservoir layer under closure stress, and drawing a distribution diagram of the conductivity of acid-etched fractures along the direction of fracture length under the reservoir layer condition. The method has a reliable principle and is easy to operate, having broad market prospects.