A High Temperature High Density Diesel Oil Base Drilling Fluid Used in North Block in North Pakistan
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摘要: 巴基斯坦北部区块地质条件复杂，地层重复反转，油气埋藏深，井底高温高压，二开井段存在长段页岩层，易吸水膨胀、垮塌，三开井段存在盐膏层易缩径、卡钻，同时盐水侵入污染高钻井液密度易造成钻井液流变性恶化，难以控制，导致该区域钻井作业异常艰难，使其成为巴基斯坦乃至世界上钻井最复杂的地区之一。针对上述难题，同时满足当地油公司的技术要求，以0#柴油为连续相，氯化钙水溶液为分散相，通过处理剂和加量优选形成了一套柴油基钻井液体系。室内评价结果表明，该钻井液抗温达180℃，最高密度达2.20 g/cm3，老化前后破乳电压大于1200 V；有良好的沉降稳定性；在高温高压下仍能保持较好的流变性，对重晶石的悬浮稳定性好，具有良好的携带岩屑能力；且具有抗15%盐水、10%页岩和石膏污染的能力，满足巴基斯坦北部区块钻井作业的应用需求。Abstract: In the North Block in Pakistan, the geological condition of the formations is very complex, and the formations penetrated have repeated inversion. The petroleum resource is buried deep in high temperature high pressure formations. Wells drilled in this block penetrated long section of shales in the second interval and salt/gypsum sections in the third interval. The shales swell and slough when in contact with water, and tight spots and pipe sticking were encountered in the salt/gypsum sections. Contamination of salt water from the formation to the drilling fluid spoiled the mud and made the mud properties difficult to control. These problems have made the drilling operations in this block extremely difficult, and the North Block is thus famous for being one of the most complex drilling areas in Pakistan or even worldwide. To deal with these problems, a diesel oil drilling fluid was formulated with 0# diesel oil (the continuous phase), CaCl2 water solution (dispersed phase) and other additives selected. This drilling fluid has satisfied the requirements of the local operator company. Laboratory evaluation showed that the properties of the drilling were stable at temperatures up to 180℃. The drilling fluid can be weighted to a density of 2.20 g/cm3. The emulsion stability of the drilling fluid before and after aging was 1200 V. The drilling fluid had good suspending capacity and cuttings carrying capacity. The rheology of the drilling fluid remained stable at high temperature and high pressure. The drilling fluid has the ability to resist contamination from 15% salt water, 10% shale cuttings and gypsum. All these characteristics of the drilling fluid have satisfied the requirements of the drilling operations in the North Block in Pakistan.
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[1] 张海,高卫宏,黄微. 巴基斯坦油服市场环境及其拓展策略[J]. 中国石油企业,2019(9):55-59. ZHANG Hai,GAO Weihong,HUANG Wei. Pakistan oil service market environment and development strategy[J].China Petroleum Enterprise,2019(9):55-59. [2] 吕鹏瑞,姚文光,张辉善,等. 巴基斯坦及中国邻区构造单元划分及其演化[J]. 西北地质,2017,50(3):126-139.LYU Pengrui, YAO Wengguang,ZHANG Huishan, et al. Tectonic unit division and geological evolution of Pakistan and its adjacent regions[J].Northwestern Geology,2017,50(3):126-139. [3] 梁明喆,艾贵成,范洪祖,等. 巴基斯坦北部DAKINI油田深井钻井技术的研究与应用[J]. 西部探矿工程, 2010,40(9):61-68.LIANG Mingzhe, AI Guicheng,FAN Hongzu,et al. Pakistan north region DAKINI oilfield deep well drilling technology research and application[J]. West-China Exploration Engineering,2010,40(9):61-68. [4] 丁振龙,黄晓川,土林,等. 巴基斯坦NASHPA_2井钻井复杂事故处理技术[J]. 钻采工艺,2013,36(2):112-113.DING Zhenglong, HUANG Xiaochuan,TU Lin,et al. Pakistan NASHPA-2 well drilling complex incident treatment technology[J].Drilling & Production Technology,2013,36(2):112-113. [5] 杨远程,潘登. 巴基斯坦Mela-1井钻井施工中的问题与建议[J]. 钻采工艺,2008,31(4):141-142,145. YANG Yuancheng, PAN Deng. Pakistan Mela-1 well drilling operation problems and suggestion[J]. Drilling and Production Technology, 2008,31(4):141-142,145. [6] 朱金智,徐同台,吴晓花,等. 加重剂对抗高温超高密度柴油基钻井液性能的影响[J]. 钻井液与完井液, 2019,36(2):160-164.ZHU Jinzhi,XU Tongta,WU Xiaohua,et al.The effects of weight materials on the performance of high temperature ultrahigh-density diesel oil base drilling fluid[J].Drilling Fluid & Completion Fluid,2019,36(2):160-164. [7] 丁振龙,胡军,张远彬,等. 巴基斯坦DAKHNI-11井钻井复杂事故处理技术[J]. 天然气技术,2013,4(5):33-34.DING Zhenlong, HU Jun,ZHANG Yuanbin,et al. Treatment technology for complex accidents during drilling DAKHNI-11 well,Pakistan[J]. Natural Gas Technology,2013,4(5):33-34. -
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