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The history of squirting out oil by drilling a hole in the ground has long been a thing of the past.
Now the Daqing Oilfield uses a compound-driven oil production method to "wash out" oil from the cracks in the rock
.
As of 2020, through compound-driven oil production, Daqing Oilfield has used 257 million tons of geological reserves, and "washed out" 37.
59 million tons of crude oil from the crevices of the stone, and the output has exceeded 4 million tons for five consecutive years
After 60 years of development and utilization, the current recovery factor of Daqing Oilfield’s main oilfield is to be increased by one percentage point, which is no less difficult than a 100-meter sprint performance improvement of 0.
1 second
.
At the beginning of the 1980s, Daqing Oilfield began to plan a development strategy of declining resources in the future
.
Since then, after a large number of experiments and theoretical analysis, Daqing Oilfield researchers have revealed for the first time the mechanism of ultra-low interfacial tension formed by the synergistic effect of heterocyclic compounds in crude oil with external surfactants in an alkaline environment, and established a quantitative matching relationship between surfactants and crude oil.
, Breaking the traditional theory of relying on the acid value of crude oil, greatly expanding the application field, and drawing the conclusion that "combined flooding technology is not only feasible in Daqing, but also has considerable benefits", and found a breakthrough point for the Daqing Oilfield to further improve the oil recovery
.
The most "stuck neck" in the combined flooding test is the surfactant, which can only be imported from abroad, and the high cost has become a bottleneck restricting the industrialization of ASP flooding technology
.
In 2000, Daqing Oilfield used surfactants in its independent production, which has a comprehensive performance better than similar foreign products and reduced costs by 40%, saving a lot of imported funds for the oilfield
.
In addition, the scientific research team of the oil production engineering system of Daqing Oilfield launched technical research and independently developed a series of anti-scaling agents for the scaling problem of compound flooding oil wells, supporting the complex scale removal and anti-scaling lifting technology of ternary compound flooding oil production wells, allowing oil wells to continue The production time has been extended from 87 days to more than 463 days, greatly reducing maintenance costs
At present, Daqing Oilfield, under the extreme conditions of oilfield water cut reaching 98%, combined flooding technology to greatly increase the crude oil recovery rate and then increase the recovery rate by more than 16%, making the recovery rate of Daqing's main oilfield exceed 60%, reaching the international level.
