三塘湖油田致密油体积压裂技术研究与应用

发布时间：2018-05-21 03:02

本文选题：致密油 + 体积压裂　；参考：《东北石油大学》2017年硕士论文

【摘要】：作为一种重要的能源供给形式,近年来,致密油气的勘探和开发在国内外已经成为热点领域之一。三塘湖油田马56区块属于典型的致密油藏,压裂改造是开发致密油藏最有效的技术手段。因此,通过对该油田体积压裂改造工艺技术开展研究,对于提高区块致密油藏开发效果以及推动致密油藏压裂增产技术上台阶具有十分重要的作用和意义。本文在总结国内外致密油储集层体积压裂改造已有成果的基础上,进行地质工程一体化研究,从储层的角度开展了储集层脆性特征、天然裂缝、储集层应力条件等方面的评价,明确了储层具备体积压裂的条件。系统评价了储层原始润湿性、压裂液对储层润湿性以及润湿性对水驱油采收率的影响,结果表明,研究区致密油储层润湿性现为弱水湿—亲水特征,平均相对润湿指数0.37。压裂液作用于储层后,储层倾向于水润湿性特征,储层亲水性增强。不同润湿性岩心水驱油实验结果表明,水润湿性越强,水—岩石作用力越强,水驱突破晚,水驱置换原油效果越好。以单井产量为目标,对水平井井眼方位以及完井方式进行了优化,并设计了3种不同的井网形式,通过数值模拟,确定了区块水平井矩形五点法井网布井方式,优化水平段长度为600~800m之间,排距为400m。对水平井分级多簇体积压裂布缝机理进行了研究,优化形成了目标区块缝间距和射孔数,采用软件数值模拟技术,对压裂主要工艺参数进行了优化,确定了目标区块裂缝半长、加砂量、导流能力以及施工排量等关键工艺参数。对影响压裂改造效果的关键因素进行了总结,水平段长度、压裂改造规模和分段距离是影响压裂改造效果最主要的因素。水平段长度与压裂效果呈正相关关系,水平井段越长,单井压后日产液、日产油和180天后累计产液、累计产油量均呈增长趋势;单井压裂改造规模越大,生产180天后的累计产液量和累计产油量也呈增加的趋势,同时单井自喷生产周期和自喷生产量也不断增加;段间距离在80~100m之间时平均单段累计产液量和产油量最高。
[Abstract]:As an important form of energy supply, the exploration and development of dense oil and gas has become one of the hot fields at home and abroad in recent years. Block Ma56 of Santanghu Oilfield is a typical compact reservoir, and fracturing is the most effective technical means to develop compact reservoir. Therefore, it is very important and significant to improve the development effect of tight reservoir in block and to promote fracturing and increasing production technology of tight reservoir by studying the technology of volume fracturing reconstruction in this oilfield. On the basis of summing up the existing achievements in volume fracturing of dense oil reservoirs at home and abroad, this paper studies the integration of geological engineering, and carries out the evaluation of reservoir brittleness, natural fractures, reservoir stress conditions and so on from the perspective of reservoir. It is clear that the reservoir has the condition of volume fracturing. The original wettability of reservoir, the effect of fracturing fluid on reservoir wettability and the effect of wettability on water drive oil recovery are systematically evaluated. The results show that the wettability of dense oil reservoir in the studied area is weak wet-hydrophilic, and the average relative wettability index is 0.37. When the fracturing fluid acts on the reservoir, the reservoir tends to wettability and the hydrophilicity of the reservoir is enhanced. The experimental results of water flooding in different wettable cores show that the stronger the wettability, the stronger the water-rock force, the later the water flooding breakthrough, the better the water displacement effect. Taking single well production as the target, the hole orientation and completion mode of horizontal well are optimized, and three different well pattern forms are designed. Through numerical simulation, the rectangular five-spot well pattern distribution mode of horizontal well in block is determined. The length of the optimized horizontal segment is between 600m and 800m, and the spacing is 400m. In this paper, the fracturing mechanism of graded multi-cluster volume fracturing in horizontal wells is studied, and the fracture spacing and perforation number of target blocks are optimized. The main parameters of fracturing are optimized by using software numerical simulation technology, and the half length of fracture in target block is determined. Key process parameters, such as sand addition, diversion capacity and construction displacement. The key factors affecting the effect of fracturing are summarized. The length of horizontal section, the scale of fracturing and the distance of fracturing are the most important factors affecting the effect of fracturing. The length of horizontal section is positively correlated with the fracturing effect. The longer the horizontal well is, the greater the daily fluid production, the daily oil production and the accumulative fluid production after 180 days are, and the larger the scale of single well fracturing is. After 180 days of production, the accumulative liquid production and cumulative oil production also showed an increasing trend, at the same time, the production cycle and self-jet production of a single well were also increasing, and the average accumulative liquid production and oil production of a single section were the highest when the distance between sections was between 80 ~ 100m.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357

【参考文献】