空气泡沫驱技术在M区块的驱油效果及储层影响因素分析

Oil displacement effect reservoir influencing factors analysis of air foam flooding technology in Block M

为系统评价空气泡沫驱技术在M区块的驱油效果,选取M区块49个注空气泡沫井组进行递减率和控水效果分析,并利用测井曲线划分各层单砂体,分析储层因素对油井受效性的影响。结果表明,空气泡沫驱具有较好的稳油控水作用,88%的生产井在泡沫驱中受益,含水率稳中有降,稳油效果明显;不受效井受单砂体展布影响较大,主要分布在单砂体边部;即便是连通储层,当储层渗透率低于一定数值时驱油效果不理想;非均质性强的储层转空气泡沫驱后稳油降水效果明显。生产动态资料表明,泡沫驱适用于低渗透储层,但注入井应尽量选在连通性及物性较好的主河道砂体中,尤其是由非均质性引起的含水快速上升的井,驱替效果明显,单砂体边部的井组由于连通性差,渗透率低,驱油效果将大大降低。该研究可为空气泡沫驱技术在低渗透油田的推广提供技术借鉴。

In order to systematically evaluate the oil displacement effect of air foam flooding technology in M block,49 air foam injection well groups in M block were selected to analyze the decline rate and water control effect.The effects of reservoir factors on the efficiency of oil well are analyzed by dividing each layer single sand body by logging curves.The results show that the air foam flooding has a good effect on oil stability and water control,88%of the production wells benefit from foam flooding,and the water cut is stable and decreased,and the oil stabilization effect is obvious.The ineffective wells are greatly affected by the distribution of single sand bodies,mainly distributed at the edges of single sand bodies.Reservoir permeability affects the oil displacement effect of air foam flooding.Even for connected reservoirs,the oil displacement effect is not ideal when the reservoir permeability is lower than a certain value.The reservoir heterogeneity affects the oil displacement effect,and the reservoir with strong heterogeneity has obvious good effect after air foam flooding.Foam flooding injection wells should be selected as far as possible in the main channel sand bodies with good connectivity and physical properties,especially in wells with rapid water cut rise caused by heterogeneity,and the displacement effect is more obvious.Due to poor connectivity and low permeability,the oil displacement effect of the well group at the edge of a single sand body will be greatly reduced.The research can provide technical reference for the popularization of air foam flooding technology in low permeability oilfield.