双疏型储层保护技术在吉兰泰油田的应用  

Reservoir Protection with Double Hydrophobic Agent in Jilantai Oilfield

作　　者：全晓虎 蒋官澄[1] 吕传炳[1] 李拥军 张勇[2] 邱爱民 贾东民 QUAN Xiaohu;JIANG Guancheng;LYU Chuanbing;LI Yongjun;ZHANG Yong;QIU Aiming;JIA Dongmin(China University of Petroleum(Beijing),Beijing,102249;PetroChina Huabei Oilfield Company,Renqiu,062550;Bohai Drilling Engineering Technology Research Institute,Renqiu,062550)

机构地区：[1]中国石油大学(北京),北京102249 [2]中国石油华北油田分公司,河北任丘062550 [3]渤海钻探工程技术研究院,河北任丘062550

出　　处：《钻井液与完井液》2020年第3期306-312,共7页Drilling Fluid & Completion Fluid

基　　金：中国石油天然气股份有限公司科技项目“华北油田持续有效稳产勘探开发关键技术”中的课题之三“低渗-特低渗油气藏提效提产井筒关键技术研究”(2017E-15-03);中国石油天然气股份有限公司科技课题“河套盆地新区新领域勘探潜力与高效勘探关键技术研究”(2019D-0815)资助。

摘　　要：巴彦河套地区为快速沉积、超补偿型盆地,2000 m以上的储层“三低一高”(低成熟度、低渗透、低强度、高泥质含量)特性显著,储层岩心水敏性强,盐敏性极强;储层岩心岩性胶结较差,粒径不统一,泥质含量高,岩石颗粒间胶结疏松,岩心制备较难、洗油后容易破碎,对产量影响严重。针对储层的强敏感性、胶结性差的问题,对储层岩性进行分析,开发了双疏剂和成膜剂,通过室内实验对其进行了评价,结果表明,加入双疏剂和成膜剂可将体系转化为双疏型储层保护钻井液,不影响原钻井液的流变参数,可实现岩石表面由亲水性转变为疏水性,同时在井壁形成膜状物,减少外来固相和液相进入储层,从而实现通过疏水、封堵等途径维持井壁稳定,减轻或避免储层损害。该技术在吉华2-209x井和吉华2-322X井的应用效果表明,双疏型储层保护技术使钻井液流变性稳定、滤失量低、抑制能力强、井壁稳定增强,保证了井径规则,未发生井下复杂事故,与邻井相比钻速提高、周期缩短、成本降低,应用效果显著,为该地区的安全高效开发提供了强有力的技术保障。The Hetao area is a fast deposited super-compensated basin,reservoirs in this area buried in less than 2000 m have notable characteristics of“three lows and one high”,that is,low maturity,low permeability,low strength,and high shale content.The reservoir rocks have strong water sensitivity,extremely strong sat sensitivity,poor cementation,non-uniform particle sizes and high shale content.Poor cementation of the rocks makes it difficult to prepare core samples which are easy to break when wash with oils.Poor rock cementation also seriously affects the production rate of crude oil.A double hydrophobic agent and a filming agent were developed to deal with the strong sensitivity and poor cementation problems.Laboratory experimental results showed that a drilling fluid treated with the double hydrophobic agent and the filming agent can be converted into a double hydrophobic drilling fluid without affecting the rheological properties of the original drilling fluid.This drilling fluid is then able to turn the rock surfaces from being hydrophilic to hydrophobic,and coats the borehole wall with a film.In this way the reservoir is protected from the invasion of solids and filtrate and borehole wall is stabilized by the hydrophobic property and plugging behavior of the drilling fluid.The drilling fluid has been used on well Jihua2-209x and well Jihua2-322x,and it was found that with the double hydrophobic reservoir protection technology,the drilling fluid had stable rheology,low filtration rate and strong inhibitive capacity.Borehole wall was stabilized and a gauge hole was drilled.No downhole problems were ever met.Compared with other wells drilled nearby,the two wells were drilled with higher ROP and lower cost.The development and application of the double hydrophobic technology have provided a strong technical guarantee for the safe and efficient development of the Hetao area.

关 键 词：双疏型 成膜 强水敏 防止地层损害 钻井液 应用 

分 类 号：TE258[石油与天然气工程—油气井工程]