China News Service, Daqing, August 25 (Yan Tingting, reporter Shi Yifu) PetroChina announced on the 25th that PetroChina Daqing Oilfield continues to deepen its understanding of shale oil geology, breaks engineering technical bottlenecks, and realizes the major strategic importance of continental shale oil in the Songliao Basin. With a breakthrough, Daqing Gulong shale oil will become an important strategic resource for Daqing’s century-old oilfield construction.
Daqing Oilfield is the largest oilfield in China and one of the few super-large continental sandstone oilfields in the world. It has been in exploration and development for more than 60 years and is facing severe challenges from imbalances in oilfield storage and production and difficulties in stabilizing production.
The conference site.
Photo by Sun Hanlun
Daqing Oilfield has strengthened the study of shale oil enrichment rules, evaluation of enrichment zones, and horizontal well fracturing to increase production, and has achieved major innovations in shale oil accumulation theory, major breakthroughs in key engineering technologies, and major achievements in exploration practice.
The discovery of the Gulong shale in Daqing Oilfield has a fractured pore reservoir system controlled by shale, breaking through the traditional understanding of poor physical properties of shale reservoirs. At the same time, it was discovered that high-clay shale had integrated source and storage and good oil-bearing properties, which broke through the main characteristics of shale oil. The traditional knowledge stored in the interbedded sandstone and carbonate rock.
In addition, it was discovered that the Gulong shale has a wide oil generation window, and the high-maturity stage can still generate liquid hydrocarbons. This breaks through the traditional understanding that Ro is greater than 1.3% and is dominated by gas. At the same time, the water-sensitive mineral montmorillonite "death line" was discovered. Traditional understanding of poor compressibility of high clay shale.
These breakthrough understandings have realized the leap from "generating" oil from continental shale to "producing" oil from continental shale, and from classical petroleum geology migration and accumulation to in-situ accumulation of high-organic shale.
At present, the key exploration wells such as Guye Youping 1, Yingye 1H, and Guye 2HC deployed in Daqing Oilfield have produced more than 30 cubic meters of oil per day and stable test production. Among them, the Guye Youping 1 well has seen oil production for more than 500 days. More than 6,000 tons of crude oil were produced, and the cumulative production of oil and gas equivalent was nearly 10,000 tons, achieving a major strategic breakthrough in continental shale oil in the Songliao Basin.
In addition, 43 vertical wells have produced oil on the plane, and 5 horizontal wells have achieved high production. In 2021, the oil-bearing area will be 1,413 square kilometers, and the newly-increased oil reserves will be 1.268 billion tons.
Daqing Oilfield regards Gulong shale oil as an important strategic area and makes every effort to accelerate various tasks.
100 wells will be implemented in 2021, 58 wells have been drilled, 27 wells have been tested, 25 wells have seen oil, and 17 wells have obtained industrial oil and gas flow.
The 14th Five-Year Plan will add 1 billion tons of proven oil reserves, and annual output of shale oil will reach more than 1 million tons.
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