Reasonable parameter limits and applications of dynamic stratified well patterns in fault-block reservoirs—by taking Ying17 fault-block in Dongxin Oilfield as an example
Affected by geological factors and current development status,Ying17 fault-block in Dongxin Oilfield has increased interlayer contradictions,intensified plane interference,and increased difficulty in regulating the inherent flow line.Therefore,it's urgent to carry out research on reasonable technical poli-cies for dynamic stratified well pattern.Based on numerical simulation methods,through comparison and prediction of multiple schemes,it's clear that the reasonable interlayer difference of production wells in separate production and injection is controlled within 4,and the reasonable interlayer difference of injection wells in the same interval is controlled within 4～6.For medium-high permeability reservoirs in the high water cut development stage,the highest recovery rate is achieved when the well spacing is 400 meters.When the injection-production ratio is 1 in the same interval,the reasonable interval changing time is 3 months,and the interval changing time decreases with the increase of injection-production ratio.It's bet-ter to keep the dynamic parameters as close as possible in the same interval combination for the best devel-opment effect in the field practice.This study lays a foundation for improving the technology and expanding the application scale.Guided by the technical policy boundary,the upper section adjustment and applica-tion will be carried out continuously in Ying17.The annual comprehensive water cut will decrease by 2.9%and the operating cost will decrease by 33 yuan/ton.The research results are of good value for the efficient development of fault-block reserves in Shengli Oilfield,and also provide a guarantee for the stable produc-tion of benefits in the ultra-high water cut stage of Shengli Oilfield.
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