石油学报 ›› 2013, Vol. 34 ›› Issue (1): 169-177.DOI: 10.7623/syxb201301022

• 石油工程 • 上一篇    下一篇

官深1井超高密度钻井液技术

蔡利山 林永学 杨小华 王文立 柴 龙 王 琳   

  1. 中国石化石油工程技术研究院 北京 100101
  • 收稿日期:2012-06-06 修回日期:2012-09-25 出版日期:2013-01-25 发布日期:2013-04-09
  • 通讯作者: 蔡利山
  • 作者简介:蔡利山,男,1963年12月生,1983年毕业于长春地质学校钻探专业,现为中国石化石油工程技术研究院钻井液研究所高级工程师,主要从事钻井液技术研究工作。
  • 基金资助:

    中国石油化工集团公司重点科研项目“官渡地区超高密度钻井液技术研究”(P10038)资助。

A study on the ultra-high density drilling fluid of Well Guanshen-1

CAI Lishan LIN Yongxue YANG Xiaohua WANG Wenli CHAI Long WANG Lin   

  • Received:2012-06-06 Revised:2012-09-25 Online:2013-01-25 Published:2013-04-09

摘要:

在全球范围内,官深1井是继官3井之后的第2口使用超高密度钻井液成功进行钻进作业的案例,该井采用2.50kg/L以上的超高密度钻井液顺利完成了835.3m的φ316.5mm井眼。为了安全顺利地完成官深1井的钻井作业,针对超高密度钻井液体系技术难点进行了大量室内实验,研制并开发了高固相分散剂SMS-19和超低黏胶体稳定剂SML-4,最终得出了抗污染能力较强并具有良好沉降稳定性的超高密度钻井液体系配方。利用该超高密度钻井液体系先后顺利实施了3个高压流体层的提密度压井作业,且在钻遇第3个高压流体层(下三叠统嘉陵江组二+三段)以后,一次性将钻井液密度由2.55kg/L提高到2.85kg/L以上并顺利转入了正常钻进。考虑到超高密度钻井液在技术上的特殊性,现场维护时采用优选筛布规格、优化胶液配伍及维护量、保持合理pH值、适时调节膨润土含量以及合理控制低密度固相含量等手段,确保了钻进作业期间超高密度钻井液体系始终保持良好的流变性能。

关键词: 超高密度, 加重剂, 体系优化, 流变性能, 膨润土含量, 现场维护, 固相控制

Abstract:

Well Guanshen-1 is the second well in the world that was successfully drilled with the ultra-high density drilling fluid after the drilling of Well Guan-3. The drilling fluid with density more than 2.50kg/L was applied to drill 835.3m of Well Guanshen-1 that has a well diameter of 316.5mm. In order to safely and successfully complete the drilling of this well, a series of experiments had been done to deal with technological difficulties of the ultra-high density drilling fluid, in which a high solid dispersing agent (SMS-19) and an ultra-low viscosity deflocculating agent (SML-4) were developed, and finally a prescription of ultra-high density drilling fluid with high resistance to contamination and better setting stability was invented. During operation, the ultra-high density drilling fluid successively penetrated three high-pressure fluid formations and implemented to improve the mud density until killing the well. After drilling passed through the third high-pressure formation (T1J1-T1J2),the mud density was increased from 2.55kg/L to over 2.85kg/L and the drilling successfully shifted to the normal one. In view of technological particularities of the ultra-high density drilling fluid, some measures were taken in on-scene care to keep the ultra-high density drilling fluid system in a good rheological performance during drilling operation, such as to adopt the optimized screen-cloth standard, to optimize gel compatibility and maintenance amount, to hold proper pH values, to adjust bentonite contents properly and to control low-density solid contents reasonably.

Key words: ultra-high density, weighting agent, system optimization, rheological property, bentonite content, on-scene care, solid-phase control