Daqing Oilfield

L7-26** Oil Well

Initial stage of production, the daily liquid production was 29t/d, and the maximum production was 75t/d. As of February 2022, the cumulative oil production

reached 134,300 tons.

4 fracturing reconstructions have been carried out since it was put into production. The validity period of the measures was relatively short, only for half a year.

-----------------------------------------------------------------------------------------------------------------

Before

U-TEM operation: It was brought on production in October 1983, with perfect injection production relationship and good oil permeability and connectivity;

By February2022, a total of 134,300 tons of oil had been produced. Since the production, a total of 4 fracturing operations have been carried out, with a validity period of about 3 months.

-----------------------------------------------------------------------------------------------

After

U-TEM operation: The uniform plugging removal of each sub layer was realized, and the daily oil increase was 13.72 tons, the oil increase rate reached 321%, and the annual added benefit was more than 1.48 million dollars. It is 3 times the fracturing stimulation effect and has a longer effective period.

-----------------------------------------------------------------------------------------------

Performance

Achieved unclogging of target layers, enhanced oil production by 265%.

Evenly removed blockage of sublayers, also unclogged the sublayers that have not been producing before. Water content has dropped from 58% to 42%.

Enhanced performance of nearby injection well. Injection pressure of well L6-2*22 dropped by 0.7MPa, and injection rate increased by 16m³/d.