Daqing Production Plant No. 2 optimized process flooding

Daqing Oilfield No. 2 Production Plant carried out measures such as reorganization of subdivision wells, optimization of the scale and process of fracturing, and fine water injection adjustments. As of June 20, there were 3,126,600 tons of crude oil produced, including 2,086,600 tons of water drive, accounting for 64% of the total output.

Faced with the severe situation in which the oilfield's comprehensive water content exceeds 92% and the contradiction between storage and production imbalances continues to intensify, this plant revolves around strategic adjustments based on long-term development and outstanding water flooding, injects and produces coordinated operations, and multi-sectoral joint research to improve overall water quality. Driving development effects, to water drive production. At present, scientific and technical personnel are conducting on-site testing and promotion and application of new types of waterflood measures and new technologies, as well as research on the adaptability of various types of stimulation measures to reservoirs, further increasing the degree of water drive, deepening the remaining oil potential, and stabilizing Improve the daily output of a single well.

“At present, we are conducting a field trial of subdivision well network reconstruction in the Nanba District-Xingyi District, based on the existing well pattern to improve the water drive development effect, and the optimal selection of the Nanba District Block for the water flooding fine-tuning demonstration area. 10 scientific research projects to achieve the purpose of improving the utilization of the oil layer, achieving fine development and fine adjustment, and further improving the overall level of water flooding at the No.2 Production Plant by using points and surfaces.” This factory’s water flooding and tapping team’s comprehensive potential taping team leader Dai Kaimei Introduction said. They carried out the comprehensive utilization of well pattern in Nanba District, aiming at the fact that the injection and production well spacing in thin-distributed oil reservoirs is large and the continuity of oil reservoirs is poor. The two wells and three wells are used to complement each other to reduce the injection well spacing, expand the effective driving range, and improve the thin difference. The oil-bearing injection and production relationship has improved the development effect; multi-disciplinary reservoir research has been carried out in the eastern block of Nanba District, 110 maps of sedimentary facies have been redrawn, combined with new drilling data, the remaining oil potential has been implemented, and various types of schemes have been guided. At present, 23 times of encrypted slow drilling has been put into production, with an initial daily output of 4.3 tons per well and a total water content of 82.1%. While opening up the submarine demonstration area for fine water diversion in the Nanba District, the plant also requires six grassroots operation areas to combine their own development practices and open up their own fine-tuned demonstration areas, starting with subdivision water injection, fine management, and improving water injection quality. , Deeply dig the potential of water flooding, and make every effort to enter the target of continuous production of more than 7 million tons.

The wells that have taken fracturing measures for waterflood account for 84.5% of the total wells, and the proportion of repeat fracturing wells reaches 73.3%. The difficulty of fracturing well selection is further increased by this fact. The scientific and technical personnel of this plant are fine reservoirs. Analysis, careful selection of wells and optimization of fracturing construction scale and construction technology. They subdivide the fracturing intervals and increase the number of fracturing intervals, and they have applied multi-crack fracturing, thin-separation fracturing, and large-sand fracturing to maximize the release of the potential of each unit and the purpose of fracturing. The proportion of fractured wells in the 3 or more layers reached 72.7%. Since the beginning of this year, a total of 41 wells have been completed by fracturing, with an average of 5 tons of oil per well, and a decrease in water content of 2.9 percentage points.

In addition, the plant also integrated the 2010 water injection comprehensive adjustment program and tracking adjustment program to increase the adjustment of water injection well subdivision, further refine the water injection interval, reduce the level of permeability within the interval, reduce the inter-layer interference, the overall The use of subdivision water-injection tests was conducted to clarify the boundaries of subdivision water injection technology and meet the demand for fine water injection in oil fields. Up to now, 155 injection wells have been sub-divided and adjusted, with 201 subdivided intervals after adjustment, 4.6 intervals for average single wells, 1070 cubic meters for daily water injection, and 302 unmeasured wells connected in the well area. After the effect, 117.2 tons of oil was added daily, and the water content in the well area decreased by 0.59 percentage points.

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