源121-3区块超前注水参数优选研究

发布时间：2018-06-22 20:14

本文选题：超前注水 + 压力梯度　；参考：《东北石油大学》2015年硕士论文

【摘要】：源121-3区块属于肇源油田,其位于黑龙江省大庆市肇源县境内,构造位置位于松辽盆地中央坳陷区朝阳沟阶地西部肇源鼻状构造上。源121-3区块属于的中孔低渗型油藏,该油藏具有渗透率低,油层渗流阻力大,地层压力传导能力差,并且存在启动压力梯度,一旦地层压力大幅下降就很极恢复等特点。油井投入生产后,因为能量不断消耗又得不到及时补充,所以油井产量递减快,地层压力极速下降,从而引起油层地质孔隙结构发生变化、岩石骨架结构发生变形,造成油层孔隙度变小,岩石渗透率降低,不利于源121-3区块的开发。本文利用数值模拟方法进行源121-3区块超前注水配套措施组合优化研究,通过预测油井普通压裂及定向压裂的开发效果,确定最优的措施方案,为源121-3区块实施超前注水技术以及现场试验方案设计提供理论与技术指导。通过对超前注水机理的研究及现场试验,建立了有效的驱替压力系统,使地层压力始终保持较高的水平,降低了因地层压力下降造成的地层伤害,抑制了油井的初始含水率,从而提高了投产初期油田的产量,使得油田能够保持较长的稳产期,减缓了递减,提高最终采收率。
[Abstract]:Block 121-3 belongs to Zhaoyuan Oilfield, located in Zhaoyuan County, Daqing City, Heilongjiang Province, and located on Zhaoyuan nose structure in the west of Chaoyang ditch Terrace in the Central Depression of Songliao Basin. Yuan-121-3 block belongs to the middle porosity and low permeability reservoir. The reservoir has the characteristics of low permeability, large permeability resistance, poor pressure conductivity, and the existence of start-up pressure gradient, which can be extremely restored once the formation pressure drops significantly. After the oil well is put into production, because the energy is constantly consumed and cannot be replenished in time, the oil well production decreases rapidly, the formation pressure drops extremely quickly, which causes the change of the geological pore structure of the reservoir and the deformation of the rock skeleton structure. The porosity of reservoir becomes smaller and the permeability of rock decreases, which is unfavorable to the development of block 121-3. In this paper, a numerical simulation method is used to optimize the combination of advanced water injection measures in Yuan 121-3 block, and the optimal measures are determined by predicting the development effect of common fracturing and directional fracturing in oil wells. It provides theoretical and technical guidance for the implementation of advanced water injection technology and field test scheme design in source 121-3 block. An effective displacement pressure system is established by studying the mechanism of advanced water injection and field test, which keeps the formation pressure high, reduces the formation damage caused by the decrease of formation pressure, and suppresses the initial water cut of oil well. Thus, the production of the oil field in the initial stage of production is increased, the oil field can maintain a longer stable production period, the decline is slowed down, and the final recovery is improved.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.6

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