SHB1-6H井长裸眼钻井液技术  

Drilling Fluid Technology for Long Open Hole Section of Well SHB1-6H

作　　者：牛晓 潘丽娟 甄玉辉 于培志[2] 

机构地区：[1]中石化西北油田分公司石油工程技术研究院,乌鲁木齐830011 [2]中国地质大学(北京)工程技术学院,北京100083

出　　处：《钻井液与完井液》2016年第5期30-34,共5页Drilling Fluid & Completion Fluid

基　　金：国家863计划项目(2012AA091502)支持

摘　　要：SHB1-6H井是中石化西北分公司部署在顺北区块的一口超深开发井,该井因采用四级井身结构,二开裸眼段长4 460 m,其中泥岩段长1 463 m,地质构造复杂,三叠系、石炭系和志留系硬脆性泥岩发育,易发生坍塌掉块,中间的二叠系由于地层破碎易发生漏失。针对以上问题,选用了钾胺基聚磺钻井液体系,以满足地层特性对钻井液抑制性的要求,但体系中原用的磺化材料是以牺牲钻井液抑制性来达到降低高温高压滤失量的目的,因此引入了抗温抗盐聚合物降滤失剂RHPT-1和抗盐成膜剂CMJ-1,以进一步提高抑制性和封堵性,降低高温高压滤失量。经现场应用表明,优化后的钾胺基聚磺成膜钻井液流型易于控制,通过保持胺基页岩抑制剂HPA加量在5~7 kg/m^3,KCl加量在30~50 kg/m^3,保障了钻井液有强的抑制性;通过使用高软化点复合沥青增强钻井液封堵能力,控制高温高压滤失量小于10 mL,解决了三叠系以深地层易发生井壁失稳的难题;在易漏地层二叠系使用了竹纤维、超细碳酸钙和聚合物凝胶堵漏剂PSD等随钻堵漏材料,避免了井漏的发生,顺利完成了SHB1-6H井的施工,二开井段扩大率仅为12%,比邻井顺北1井降低了63.74%。该套钻井液技术保障了顺北区块井身结构优化的实施。Well SHB1-6H is an ultra-deep well drilled in Shunbei area by Sinopec, and is the first well in this area to use 4 casing string sizes. The second interval of the well, with open hole length of 4,460 m, 1,463 m of which is mudstones, has complex geology;The Trias, Carboniferous and Silurian systems are mainly hard and brittle mudstones, apt to cave-in. Lost circulations have been easy to occur in drilling the shattered Permian system. To avoid these problems, a high temperature salt-resistant filter loss reducer,RHPT-1 and a filming agent, CMJ-1, were used in the potassium- and amine-treated sulfonated polymer drilling fluid to improve the inhibitive capacity, plugging performance and filtration behavior. In field application, the improved polymer sulfonate drilling fluid had rheology easy to control. To maintain the inhibitive capacity of the drillingfluid, 5-7 kg/m^3 of HPA（an amine based shale inhibitor） and30-50 kg/m^3 of KCl were kept therein. A high softening point asphalt was used to enhance the plugging performance of the drilling fluid, and to reduce the HTHP filter loss to less than 10 mL. With these measures, borehole instability in the formations below the Trias system was effectively solved. In drilling the Permian system, bamboo fibers, ultra-fine CaCO3 and polymerized gel LCM have been used to avoid mud losses. The hole enlargement for the second section of well SHB1-6H was 12%, reduced by 63.74% than the adjacent well.

关 键 词：长裸眼 硬脆性泥岩 井壁稳定 钾胺基聚磺钻井液 抗温抗盐聚合物降滤失剂 成膜剂 顺北区块 

分 类 号：TE254.3[石油与天然气工程—油气井工程]