冀东油田低渗透储层水基压裂液体系研究与应用

发布时间：2018-03-13 09:08

  本文选题：压裂液　切入点：交联剂　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：压裂是油田普遍采用的一种有效增产技术,而压裂液体系则是决定压裂效果的核心与关键。冀东油田的复杂断块油藏以细砂岩为主,自然渗透能力差,属于特低渗透储层。在使用传统的瓜胶压裂液后,注入的聚合物仅有35-40%能被返排出来,而残余的聚合物留在裂缝中或侵入地层造成对储层渗透率的二次伤害,使压裂增产措施达不到预期目的。高效、低伤害、有针对性的清洁压裂液成为目前研究压裂液体系的首要问题。本文通过优选优化交联剂、助剂的生产工艺和生产条件,并针对低渗透油藏研发了小分子量双子阳离子型防膨剂和由多种表面活性剂复配而成的新型防乳助排剂,最终得到一套适合冀东油田南堡403X1断块地层的可满足储层温度在90℃至120℃的JRYL-1压裂体系。通过检测,新型防乳助排剂使压裂液滞留降低率从单体的40%达到了复配后的50%,远高于现用助排剂的16.7%。新型防乳助排剂可将压裂破胶液的界面张力降至0.29-0.34mN/m,渗透率恢复率为83.4%,高于现用助排剂的渗透率恢复值72.2%,有效降低了压裂破胶液对岩心的伤害。截止到2015年底,JRYL-1压裂体系在冀东油田共计使用120井次,施工过程顺利进行且高质量的完成,提高了油井的产量,给油田带来了经济效益。这充分的说明JRYL-1压裂体系的性能优异且可靠性较高。
[Abstract]:Fracturing is an effective stimulation technique widely used in oil fields, and the fracturing fluid system is the core and key to determine the fracturing effect. The complex fault-block reservoirs in Jidong Oilfield are dominated by fine sandstone and have poor natural permeability. It is an ultra-low permeability reservoir. Only 35-40% of the injected polymer can be discharged back after using the traditional melamine fracturing fluid, while the residual polymer remains in the fracture or invades the formation, causing secondary damage to the reservoir permeability. The high efficiency, low damage and targeted clean fracturing fluid has become the most important problem in the study of fracturing fluid system. This paper optimizes the production process and production conditions of crosslinking agent, auxiliary agent, etc. For low permeability reservoirs, a small molecular weight Gemini cationic anti-swelling agent and a new anti-emulsion and drainage aid, which are composed of a variety of surfactants, have been developed. Finally, a set of JRYL-1 fracturing system suitable for the formation of Nanbao 403X1 fault block in Jidong Oilfield is obtained, which can satisfy the reservoir temperature from 90 鈩，

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