新型低伤害高性能微泡沫钻井液在滇东煤层气井的应用
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1.中联煤层气有限责任公司;2.中国石油大学(北京)

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国家科技重大专项专题《新型低伤害强防塌钻井液的研究》(2016ZX05044003-003)。


Application of New Low-damage and High-performance Micro-foam Drilling Fluid in Coalbed Methane Wells in Eastern Yunnan
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China University of Petroleum

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    摘要:

    滇东地区飞仙关组三段、飞仙关组一段地层为易失稳地层,为保护煤层储层,设计应用新型低伤害高性能微泡沫钻井液技术。将研制的起泡剂LHPF-1与起泡剂BS-12和增粘剂XC进行复配,利用Box-Behnken实验设计法分析三种处理剂间的交互作用对于泡沫综合指数Fq的影响。在此基础上优选降滤失剂和抑制剂,最终确定微泡沫钻井液配方为:0.25%LHPF-1+0.25%BS-12+0.25%XC+1%SPNH+1%NH4HPAN+0.2%KPAM。研究结果表明,该钻井液密度可降至0.49g/cm3,起泡量可达420mL,泡沫半衰期可达2000min以上,泡沫液膜厚度能达到泡沫尺寸的50%,煤层岩心封堵率和渗透率恢复值均在90%以上,同时可抗7%的岩屑和煤粉污染。该钻井液在滇东地区老厂勘探区LC-C7-2D井二开井段进行了现场应用,纯钻进时间4天,无任何井下复杂事故,全井段平均井径扩大率为5.9%,滤失量小于5mL。

    Abstract:

    The third member of Feixianguan Formation and the first member of Feixianguan Formation in eastern Yunnan are easily unstable formations. In order to protect coal bed reservoirs, new low-damage high-performance micro-foam drilling fluid technology is designed and applied. The developed foaming agent LHPF-1 was compounded with foaming agent BS-12 and tackifier XC, and the response surface optimization experiment was used to analyze the influence of the interaction between the three treatment agents on the foam composite index Fq. On this basis, fluid loss agents and inhibitors are optimized, and the final microfoam drilling fluid formula is determined to be: 0.25%LHPF-1+0.25%BS -12+0.25%XC+1%SPNH+1%NH4HPAN+0.2%KPAM. The research results show that the density of the drilling fluid can be reduced to 0.49g/cm3, the foaming volume can reach 420mL, the half-life of the foam can reach more than 2000min, the thickness of the foam liquid film can reach 50% of the foam size, and the coal core plugging rate and permeability The recovery value is above 90%, and it is resistant to 7% of debris and coal pollution. The drilling fluid was applied on-site in the second opening section of Well LC-C7-2D in the Laochang exploration area in eastern Yunnan. The pure drilling time was 4 days without any complicated downhole accidents. The average caliper expansion rate for the whole section was 5.9% , The fluid loss is less than 5mL.

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  • 收稿日期:2020-10-20
  • 最后修改日期:2020-12-29
  • 录用日期:2020-12-31
  • 在线发布日期: 2021-12-21
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