杏子川油田杏2005井区注水优化研究

发布时间：2018-06-07 01:19

本文选题：杏2005井区 + 储层　；参考：《西安石油大学》2015年硕士论文

【摘要】：本文以杏子川油田杏2005井区长4+5、长6储层为研究对象,通过研究区地层划分、构造特征研究、砂体展布分析、储层物性特征研究等油藏描述方法确定了该区油藏特征及类型。并通过该区储层注水开发渗流特征研究,确定了影响注水开发效果的主要因素,利用注水开发技术政策相关技术手段对研究区进行了注水优化研究。研究表明,杏子川油田杏2005井区长4+5、长6储层属于低孔、特低渗透油藏,储层孔隙类型为次生孔隙,以粒间溶孔为主,喉道类型主要为缩颈状。孔喉特征主要表现为细小孔隙、微细喉道特征、喉道短而窄。该类储层通过渗流特征研究结果显示,该储层油水两相渗流区间较窄,偏亲水,并存在启动压力梯度及非线性渗流特征,通过应力敏感性试验显示,压力的变化对储层孔隙度影响不大,但是对储层渗流率影响非常大,并且具有不可逆性。针对储层压敏问题建议油田开发中保持油井合理生产压差,控制压力降低速率。采用超前注水,建立有效驱替压力使储层物性改善后再投产。通过水锁伤害试验研究显示,低渗透储层确实存在水锁效应,储层渗透率越低,水锁伤害越严重。通过注入液与地层流体配伍性实验结果,该井区注入水与地层水存在不配伍性,注入不配伍水在地层将主要产生沉淀,建议在注入站加入主要针对沉淀物的防垢剂,以尽量减少不配伍结垢对地层造成伤害。通过各类试验结果,最终确定了影响注水开发的各类因素,建议该区采用超前注水结合表活剂驱油的方式投入开发,通过注采井网优化、注入压力参数优化等技术对该区注水开发进行整体优化并对杏2005井远期注水开发指标进行了预测。
[Abstract]:Taking Chang 45 and Chang 6 reservoirs of well Xing 2005 in Xingzichuan Oilfield as the research object, the reservoir characteristics and types in this area are determined by stratigraphic division of the study area, study on structural characteristics, distribution analysis of sand bodies and study on reservoir physical characteristics. Based on the study of seepage characteristics of reservoir water injection development, the main factors affecting the effect of water injection development are determined, and the water injection optimization research is carried out by using the relevant technical means of water injection development policy. The results show that reservoir Chang 45 and Chang 6 belong to low porosity and ultra-low permeability reservoir in Xinzichuan Oilfield, Xinzichuan Oilfield. The pore type of reservoir is secondary pore, mainly intergranular dissolved pore, and throat type is neck-like. Pore throat is characterized by small pore, fine throat, short and narrow throat. The results of percolation study show that the oil-water two-phase percolation zone is narrow and hydrophilic, and there are start-up pressure gradient and nonlinear percolation characteristics, which are shown by stress sensitivity test. The change of pressure has little effect on reservoir porosity, but has great influence on reservoir percolation rate and irreversibility. In view of the problem of reservoir pressure sensitivity, it is suggested to maintain reasonable production pressure difference and control the rate of pressure reduction in oilfield development. The effective displacement pressure is established to improve the physical properties of reservoir and then put into production. The experimental study of water lock damage shows that water lock effect does exist in low permeability reservoirs, and the lower the reservoir permeability is, the more serious the water lock damage is. According to the experimental results of compatibility between injection fluid and formation fluid, the injected water in this well area has incompatibility with formation water, and the injected unmixed water will mainly produce precipitate in the formation. It is suggested that the antifouling agent mainly aimed at sediment should be added at the injection station. To minimize the formation damage caused by incompatibility scaling. Through all kinds of test results, various factors affecting water injection development are finally determined. It is suggested that the way of leading water injection combined with surface active agent flooding be put into development, and the injection-production well pattern be optimized. The injection pressure parameter optimization is used to optimize the water injection development in this area and the long-term water injection development index of Xing 2005 well is forecasted.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.6

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