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       On June 6th, Northwest Oilfield applied polymer fracturing fluid and ordinary gelled acid fracturing technology for the first time to carry out acid fracturing transformation on TK511CH well, achieving high production of oil and gas flow. From June 7th to 8th, trial production was conducted using 10mm and 8mm nozzles, resulting in a cumulative production of 104.7 tons of crude oil and 4492 cubic meters of natural gas per day.

       TK511CH well is a development well located in the axis of Akkule uplift in Tahe Oilfield. According to the characteristics of water development in the Yingshan Formation of the well, the oilfield conducted acid fracturing transformation tests using polymer fracturing fluid and ordinary gelling acid fracturing technology in the 5780-5905 meter open hole section of the Middle Ordovician Yingshan Formation. The injection volume of acid fracturing is 582 cubic meters. The experiment shows that the polymer fracturing fluid system can meet the requirements of sand carrying, can be diluted by water, and oil and gas can enter and expand the micelle, achieving the purpose of gel breaking; The broken gel backflow fluid is directly discharged, and the fracturing construction process does not cause any harm to the environment, achieving clean production.

       At 17:00 on June 7th, after acid fracturing, the well was opened and production was confirmed using a 10mm nozzle. At 16:00 on June 8th, production was carried out using an 8mm nozzle, with an oil pressure of 4.7 MPa and a casing pressure of 0 MPa. The cumulative production volume was 104.7 tons of crude oil with a specific gravity of 0.870, and the daily production volume was 4492 cubic meters of natural gas.

       The successful application of polymer environmentally friendly fracturing technology in Tahe Oilfield has opened up a new path for "black resources, green development".