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海上复杂易垮塌地层高性能油基钻井液研发与应用

吴江,  李龙,  任冠龙,  张崇

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文章导航 > 钻井液与完井液  > 2018 >  35(5): 55-60
吴江, 李龙, 任冠龙, 张崇. 海上复杂易垮塌地层高性能油基钻井液研发与应用[J]. 钻井液与完井液, 2018, 35(5): 55-60. doi: 10.3969/j.issn.1001-5620.2018.05.011
引用本文: 吴江, 李龙, 任冠龙, 张崇. 海上复杂易垮塌地层高性能油基钻井液研发与应用[J]. 钻井液与完井液, 2018, 35(5): 55-60. doi: 10.3969/j.issn.1001-5620.2018.05.011
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WU Jiang, LI Long, REN Guanlong, ZHANG Chong. Development and Application of A High Performance Oil Base Drilling Fluid for Drilling Complex Sloughing Formations in Offshore Operations[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 55-60. doi: 10.3969/j.issn.1001-5620.2018.05.011
Citation: WU Jiang, LI Long, REN Guanlong, ZHANG Chong. Development and Application of A High Performance Oil Base Drilling Fluid for Drilling Complex Sloughing Formations in Offshore Operations[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 55-60. doi: 10.3969/j.issn.1001-5620.2018.05.011
shu

海上复杂易垮塌地层高性能油基钻井液研发与应用

doi: 10.3969/j.issn.1001-5620.2018.05.011

  • 中海石油(中国)有限公司湛江分公司, 广东湛江 524057

基金项目: 

中国海洋石油集团有限公司科技攻关项目“高温高压钻完井液、固井工艺研究与应用”（CNOOC-KJ 135ZDXM 24 LTD ZJ 02）。

详细信息
    作者简介:

    吴江,硕士研究生,1983年生,2010年毕业于中国石油大学(北京)油气井工程专业,主要从事海上油气井钻井及储层保护工艺技术研究。E-mail:wujiang2@cnooc.com.cn。

  • 中图分类号: TE254.3

Development and Application of A High Performance Oil Base Drilling Fluid for Drilling Complex Sloughing Formations in Offshore Operations

  • CNOOC Zhanjiang Branch Company, Zhanjiang, Guangdong 524057

    摘要
  • 摘要: 南海西部北部湾盆地涠西南油田涠洲组地层受构造应力及地层高含硬脆性泥页岩影响，井壁失稳风险极高，传统油基钻井液在钻进涠二段过程中不断出现起钻困难、井壁失稳和固井质量差等诸多问题。在分析传统油基钻井液应用情况的基础上，通过对乳化剂、封堵剂以及提切剂等处理剂优选，研发了新型高油水比（95∶5）高性能油基钻井液体系，该钻井液具有良好的井壁稳定、封堵能力以及优异的ECD控制能力，抗劣质土污染可达15%，岩心被钻井液损害后渗透率恢复值在90%以上，返排压力为0.4 MPa，具有良好的储层保护能力，并可提高机械钻速和起下钻效率。现场应用结果表明，高性能油基钻井液钻进涠洲组二段地层时，钻井液流变性稳定，封堵性强，井眼清洁效果好，ECD值低，未发生井漏现象，井深2 500 m钻井周期为8.09 d，较前期开发井钻井周期降低48%，储层保护效果良好。为今后北部湾海域类似油田开发提供了良好借鉴。

     

    Abstract: Wellbore instability has been a risk encountered in drilling the Weizhou formation in Weixinan oilfeld, Beibu Gulf Basin, west of South China Sea, because of the effects of tectonic stresses and the hard and brittle shales existed in the formation. Diffculties in pulling out of hole, wellbore instability and poor well cementing quality are problems found in using conventional oil base drilling fluids. A new high-performance oil base drilling fluid, with oil/water ratio of 95:5, has been developed based on the analyses of the application of conventional oil base drilling fluids and through optimization of emulsifer, plugging agent and gelling agent. This new oil base drilling fluid had the good borehole wall stabilizing capacity, good plugging capacity, excellent ECD control ability, and tolerance to contamination of 15% low quality clay. Percent recovery of permeability of cores contaminated by this new oil base drilling fluid was more than 90%, with flowback pressure of only 0.4 MPa, indicating that the oil base drilling fluid had good reservoir protection capacity. Field application of the oil base drilling fluid showed that when drilling the Member Ⅱ of the Weizhou formation, the drilling fluid had stable rheology, good plugging capacity and good hole cleaning performance, no mud losses happened during drilling. It only spent 8.09 d to drill 2,500 m of the well, 48% less than the drilling time spent previously drilling other development wells nearby. Reservoir was also well protected. The success of the drilling operations with the new oil base drilling fluid provides a good clue for oilfeld development in areas similar to Beibu Gulf Basin.

     

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出版历程
  • 收稿日期:  2018-06-29
  • 刊出日期:  2018-09-30

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