桥口油田ES_(2下)储层研究及挖潜技术对策

针对桥口油田储层非均质严重,水驱采收率偏低的开发现状,开展了储层沉积微相研究,将储层划分为I、II、III类层,根据储层特点开展了多层水驱油效率室内试验及室内压裂试验,试验结果表明,分类储层对采收率的影响不大,在桥口油田只要选取适当的开采方式及工艺技术,II、III类低渗层的采收率理论上分别可以达到5 3.2 3%和5 9.31 % ,为桥口油田ES2下油藏挖潜提供了可靠的理论依据,在试验理论指导下,应用适合油田特点的定向井、堵水、储层压裂改造技术,逐步缓解油藏平面、层间矛盾,油田明显改善。

Study on Qiaokou Oilfield ES2d Reservoir and Countermeasures on Potential Oil Reserve

Limited by serious horizontal and vertical heterogeneity, Qiaokou oilfield comes across some difficults on waterflooding in low-permeability layers. Partition the layer into class I, II, III on the base of reservoir characteristics. The result shows that the recovery in layers class II, III will improve to 53.23%and 59.31%by proper exploitation technology on the basis of lab study on waterflooding recovery efficiency. A series of techniques are studied and applied to improve the recovery. Some big displacement directional wells & adjustment wells are drilled to solve the problem of heterogeneity. To solve the vertical heterogeneity of well section, the section adjustment of oil production & water-injection such as water shutoff, fracturing, divided-injection & augmented injection are applied. The practice at well site shows that the horizontal & verticle heterogeneity can be solved together with the increasing discovery. It also provides some experiences for the same type of reservoir.