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疏松砂岩油藏进入水淹阶段后,中强水淹层不断增多,不同级别水淹层存在使地质油藏情况更加复杂,给调整井布井及产量预测带来很大困难。本文采取水淹层厚度加权法、类比法、数模法预测含水率,利用无因次采油指数法预测油层产油能力,利用Mohr-Coulomb准则预测油藏出砂临界生产压差,形成一套疏松砂岩油藏水淹阶段调整井产量预测方法。经渤海L油田东二上段验证,其预测结果真实可信,方法实用性强,适用于疏松砂岩油藏各个水淹阶段。
After the unconsolidated sandstone reservoir enters the water flooding phase, the middle and strong water flooded layers increase continuously. The existence of different levels of water flooded layers makes the situation of the geological reservoirs more complicated, which brings great difficulties to the well adjustment and well production prediction. In this paper, the waterflooding layer thickness weighted method, the analogy method and the numerical model method are used to predict the water cutoff rate. The MLFM method is used to predict the oil production capacity. The Mohr-Coulomb criterion is used to predict the critical sand production pressure difference and form a set Prediction method of adjustment well production in unconsolidated sandstone reservoir during flood period. The results of the prediction in the upper reaches of East Second Member of Bohai L Oilfield show that the prediction results are credible and reliable, and the method is practicable and applicable to all water flooding stages of unconsolidated sandstone reservoirs.