Successful exploration of new shale oil formations in Subei Basin

　　Sinochem News Network News On July 13, the HF well on the Hua 2 side of the shale oil exploration well in Huazhuang area, Gaoyou sag, North Jiangsu Basin, adopted the integrated technology of small wellbore geology and engineering, and took the lead in making exploration breakthroughs in the new formations of the IV sub-member, with daily oil production.
Over 30 tons and more than 1,500 cubic meters of natural gas
.

　　Four sets of favorable shale intervals are developed vertically in the second member of Fu 2 in Gaoyou Sag, and the resources in the favorable area are about 754 million tons
.
In the early stage, the Huaye 1HF well deployed by Jiangsu Oilfield for the V sub-section of the second section of Fu 2 successfully achieved a breakthrough in exploration, and has produced more than 2,700 tons of crude oil
.
In order to evaluate the oil-bearing properties of the shale in the IV sub-member of Block 1 of Huaye, and at the same time consider the cost reduction and efficiency improvement, under the premise of using the old well to carry out slim hole sidetracking to achieve "zero" experience in the integration of geology and engineering, the old Hua 2 well was selected.
Deep side-drilling the HF well of Hua 2 to expand the new formation of shale oil in the second member of Fu
.

　　At the beginning of December 2021, after the pilot hole Hua 2 lateral well entered the target layer of the IV sub-member, it once encountered a good oil and gas display, and the gas log anomaly increased to 100%
.
For the first time in the oilfield, the all-electric drive fracturing process was used to reform the reservoir in this well, setting three fracturing construction records in the oilfield, including the amount of fluid entering the well, the amount of sand added in a single well, and the amount of sand added in a single stage
.
On May 24 this year, the 3mm nozzle was used to spray, and after 9 hours of liquid discharge, 26.
6 cubic meters of liquid began to see oil, showing the characteristics of "fast oil seeing, slow pressure drop, and fast water content drop"
.
On June 12, after the plug removal operation, the oil pressure dropped slowly, the water content quickly dropped to about 59.
8%, and the flowback rate was 1.
30%
.
At present, the daily oil injection in this area exceeds 31.
8 tons, which has transformed the wells of more than 20 years into shale oil "new recruits"
.