第33卷第4期 2016年7月
钻井液与完井液
DRILLINGFLUID&COMPLETIONFLUID
doi: 10.3696/j.issn.1001-5620.2016.04.006
纳米微球保护储层钻井液研究及应用
耿学礼，苏延辉，郑晓斌，史斌（中海油能源发展股份有限公司工程技术分公司，天津300451）
联学礼等.纳米微球保护储层钻井液研究及应用[J].钻井液与完井液，2016，33（4：32-35.
Vol.33 No.4
July2016
摘要致密砂岩气藏具有特殊的储层特性，在钻井施工中极易受到损害，且损害难以解除。临兴区块是典型的低孔渗。致密、低丰度、不含硫干气气。为防止储层损害，在该区块钻井完井液中引入了封堵剂Micro-ball和CARB，API滤失量降至5mL以下，防竭、封堵性能优良，对易塌地层的岩屑回收率大于93%。纳米微球聚合物封堵剂Micro-ball是一种纳
米级高分子聚合物，能对储层的微小喉道形成暂堵，
可形成超低渗透率的内泥饼；多级情性封堵剂CARB是一种粒径多级
分布的可酸溶的情性处理剂，其粒径范围一般大于储层孔碳，其在井壁表面可快速形成薄而脆的外泥饼，封堵效果好，泥饼易于清除。LX-xx5-1H井水平段采用裸眼-压裂方式完井，施工中该体系保持了良好的润滑性能，有效解决了钻进托压间题，未出现任何黏附钻具的情况；有良好的抗污染能力，性能稳定，维护简单；具有良好的流型和强抑制性，未发生塌撑块情况，多次起下钻十分顺利；压裂试气产量达到预期效果。
关键调致密砂岩气藏；钻井完井液；储层保护；纳米封堵剂；临兴区块
中图分类号：TE254.3
文献标识码：A
文章编号：1001-5620（2016）04-0032-04
StudyandApplication ofReservoirProtectionDrillingFluid Treated withNano Spheres
GENG Xueli, SU Yanhui,ZHENG Xiaobin,SHI Bin
(CNOOCEnerTech-Drilling&ProductionCo.,Tianjin300451)
Abstract Tight sandstone gas reservoirs have special characteristics that make them quite prone to damage, which is very difficult tc remove, during drilling. The dry gas reservoir in the Block Linxing, for example, is such kind of reservoirs, with low porosity, low permeability, low abundance, and no sulfur. To protect the reservoir from being damaged, two plugging agents, Micro-ball and CARB, have been used in the drill-in fluids to reduce the API filter loss to less than 5 mL. The Micro-ballis a high molccular weight polymer nano material able to penetrate into the pores in the reservoir formations to form interior mud cakes with ultra-low permeability, thereby to temporarily plug the micro pores. CARB is an acid-soluble inert spherical material with wide range of particle size distribution. CARB has particle sizes greater than the sizes of the pore throats in the reservoir formations, and are thus able to mud cakes on the surface of the formations. CARB has good plugging capacity and forms mud cakes that are easy to remove. The horizontal well LX-xx5-1H, completed with open-hole fracturing, was drilled with this drill-in fluid, which had good inhibitive capacity (shale cuttings percent recovery in hot rolling test is greater than 93%) and good plugging capacity. The improved lubricity of the drill-in fluid helped solve the problems of being unable to exert WOB during horizontal drilling, and balling of BHA. The drill-in fluid is resistant to contamination, has stable property which is easy to maintain, and good flow patterm. The drilling operation has been successful, and the gas production rate obtained after fracturing job is highly satisfactory
Key words Tight sandstone gas reservoirs; Drill-in fluid; Reservoir protection; Nano plugging agent; Block Linxing
临兴区块位于鄂尔多斯盆地东缘，是典型的致密砂岩气藏，也是中海油对非常规油气开发的主价与保护技术研究”（HFXMLZ-CJFZ1311）。
要区块。临兴地区目前完钻井型主要为直井和定向并，所应用的钻井液体系为钾基聚合物钻井液体
第一作者简介：耿学礼，工程师，1983年生，毕业于长江大学化学工程与工艺专业，一直从事钻完井液及储层保护
研究等工作。电话13612143779；E-mail：gengxl2@cnooc.com.cn。万方数据