新庄油田易漏地层的固井技术研究

发布时间：2018-03-15 10:49

本文选题：固井　切入点：新庄油田　出处：《长江大学》2017年硕士论文　论文类型：学位论文

【摘要】：新庄油田地处河南省南部唐河县与泌阳县之间,是河南油田稠油生产区之一。该油田南三块位于泌阳凹陷北部斜坡带东段,地质条件较为复杂,油层埋藏浅,特、超稠油含量高,地层胶结松散、易漏、温度低,极易发生固井漏失和井壁垮塌,顶替效率差,导致该块区固井质量不能满足开发要求。结合国内外易漏地层的固井技术研究和发展现状,本文分析了新庄油田地质特点和岩性情况,发现新庄油田固井难点具体表现为地层呈裂缝发育、承压能力低、压力窗口小,井身结构简单、裸眼井段长、层间复杂、施工工艺要求严格,导致固井过程中固井质量的要求高。固井施工中易发生水泥浆漏失,水泥浆外加剂选择困难,易漏地层固井施工顶替效率差。针对新庄油田固井易漏失,固井质量难以保证的问题,首先开展了提高易漏地层承压能力技术的室内研究,通过砂床滤失实验和岩芯承压能力实验,得到5#钻井液配制的堵漏浆能够对易漏地层进行有效封堵,提高薄弱地层稳定性和承压能力,有效扩大安全密度窗口。最后使用5#(基浆+3%CY-1+1%DF-1+3%QS-2+3%SF-1)堵漏浆结合现场总结出一套承压堵漏现场方案措施,满足现场要求。在现场承压堵漏能力得到提高后,展开了对易漏地层固井水泥浆体系的研究。首先,对水泥浆流变基理和凝结特性进行了研究,然后结合新庄油田易漏地层固井水泥浆体系设计要求,进行了水泥浆稠化实验、漂珠低密度防漏水泥浆体系的室内实验与研究,对降失水剂和膨胀剂等外加剂的优选,最终选出1.65g/cm3的水泥浆配方(嘉华G级高抗水泥+10%PZ漂珠+30%石英砂+2%W99降失水剂+10%PZW-A低密度增强剂+2.0%F27A防漏增韧剂+0.8%USZ分散剂+1%G502膨胀剂+2.5%早强剂+XP-1消泡剂)。最后,对新庄油田易漏地层固井进行技术研究,摸索出一套适合新庄油田易漏地层固井技术措施,最终采用分级固井工艺和插入法固井工艺进行现场施工,效果较好。现场固井结果表明,优选出的低密度水泥浆和固井工艺有助于提高新庄油田易漏地层固井质量,满足油田开发的需要。通过以上一系列的实验和研究表明,本次研究所优选出的低密度防漏固井水泥浆体系及固井工艺解决了新庄油田浅层系、松散层易漏失井的固井质量问题,不仅满足了固井施工的需要,而且提高了该区块的固井质量。通过现场10口井试验,固井施工成功率100%,固井优质率达到30%。该项技术成功解决了该区块固井漏失问题,提高了固井质量,确保了该区块的开发方案得到有效地实施。
[Abstract]:Xinzhuang Oilfield, located between Tanghe County and Biyang County in southern Henan Province, is one of the heavy oil production areas in Henan Oilfield. Because of its high content of super heavy oil, loose cementation, easy leakage and low temperature, cementing loss and wellbore collapse are easy to occur, and the displacement efficiency is poor. As a result, cementing quality in this block can not meet the requirements of development. Combined with the research and development of cementing technology in leaky formations at home and abroad, the geological characteristics and lithology of Xinzhuang Oilfield are analyzed in this paper. It is found that the difficulties of cementing in Xinzhuang Oilfield are that the formation has developed fractures, low pressure bearing capacity, small pressure window, simple borehole structure, long open hole section, complex interlayer and strict construction technology requirements. As a result, the cementing quality is high in the cementing process, the cement slurry leakage is easy to occur in cementing operation, the selection of cement slurry admixture is difficult, and the replacement efficiency of cementing operation in the easily leaky formation is poor. The cementing is easy to be lost in Xinzhuang Oilfield. The cementing quality is difficult to be guaranteed. Firstly, laboratory research on improving the bearing capacity of leaky formation is carried out, through sand bed filtration experiment and core pressure capacity experiment, The plugging slurry prepared by drilling fluid can effectively seal the easily leaky formation and improve the stability and pressure bearing capacity of the weak formation. Effectively expand the safe density window. Finally, use 5#5#3CY-1 1-133QS-2 combined with site to summarize a set of pressure plugging site measures to meet the site requirements. After the site pressure plugging capacity has been improved, The research on cementing slurry system in easily leaky formation is carried out. Firstly, the rheological mechanism and setting characteristics of cement slurry are studied, and then the thickening experiment of cement slurry is carried out according to the design requirements of cementing slurry system for easily leaky formation in Xinzhuang Oilfield. Laboratory experiment and study on low density leakproof cement slurry system, selection of additives such as water loss reducing agent and expansion agent, etc. Finally, the formula of 1.65g / cm3 cement slurry (Jiahua G class high resistance cement 10PZ and adrift beads 30% quartz sand 2 and W99 water loss reducing agent 10PZW-A low density reinforcer 2.07A anti-leakage toughener 0.8USZ dispersant 1G502 expander 2.5% early strength agent XP-1 defoamer were selected. Finally, The cementing technology of easily leaky formation in Xinzhuang Oilfield is studied, and a set of cementing measures suitable for easily leaky formation in Xinzhuang Oilfield is found out. Finally, the field operation is carried out by using classified cementing technology and inserting cementing technology. The field cementing results show that the selected low density cement slurry and cementing technology can improve the cementing quality of the easily leaky formation in Xinzhuang Oilfield and meet the needs of oilfield development. The cementing slurry system and cementing technology for low density leakproof cementing wells selected by this study have solved the cementing quality problems of shallow and loose reservoirs in Xinzhuang Oilfield, which not only meet the needs of cementing operation. Moreover, the cementing quality of this block is improved. Through the field tests of 10 wells, the success rate of cementing operation is 100 and the cementing high quality rate reaches 300.This technology has successfully solved the cementing leakage problem and improved the cementing quality in this block. This ensures the effective implementation of the development scheme of the block.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE256

【相似文献】