林永学, 甄剑武. 威远区块深层页岩气水平井水基钻井液技术[J]. 石油钻探技术, 2019, 47(2): 21-27. DOI: 10.11911/syztjs.2019022
引用本文: 林永学, 甄剑武. 威远区块深层页岩气水平井水基钻井液技术[J]. 石油钻探技术, 2019, 47(2): 21-27. DOI: 10.11911/syztjs.2019022
LIN Yongxue, ZHEN Jianwu. Water Based Drilling Fluid Technology for Deep Shale Gas Horizontal Wells in Block Weiyuan[J]. Petroleum Drilling Techniques, 2019, 47(2): 21-27. DOI: 10.11911/syztjs.2019022
Citation: LIN Yongxue, ZHEN Jianwu. Water Based Drilling Fluid Technology for Deep Shale Gas Horizontal Wells in Block Weiyuan[J]. Petroleum Drilling Techniques, 2019, 47(2): 21-27. DOI: 10.11911/syztjs.2019022

威远区块深层页岩气水平井水基钻井液技术

Water Based Drilling Fluid Technology for Deep Shale Gas Horizontal Wells in Block Weiyuan

  • 摘要: 为解决威远区块深层页岩气水平井长水平段井眼失稳的问题,研制了具有强抑制性、强封堵能力的水基钻井液。分析了威远区块页岩储层矿物组分、储层物性和页岩地层井眼失稳机理,认为在该地层钻进水平段时,所用钻井液应具有较强的抑制性、封堵能力和一定的润滑性。在优选抑制剂、封堵剂和润滑剂的基础上,配制了深层页岩气水平井水基钻井液SM–ShaleMud,并对其性能进行了室内评价。室内试验结果表明:该钻井液流变性能好,高温高压滤失量低,润滑系数小;可抗温140 ℃,能有效抑制黏土水化和裂缝的产生、扩展;封堵能力和抗污染能力强。SM–ShaleMud水基钻井液在威远区块威页23平台3口井进行了应用,结果表明具有良好的综合性能,特别是井眼浸泡67 d后仍保持稳定,说明其具有强抑制性和强封堵能力。研究表明,SM–ShaleMud水基钻井液能够解决威远区块深层页岩气水平井长水平段井眼失稳问题,现场应用效果显著。

     

    Abstract: In order to solve the problem of wellbore instability in the horizontal section of deep shale gas horizontal wells in Block Weiyuan, a water based drilling fluid with strong inhibition and plugging capacity was developed. Through analysis on mineral composition, reservoir physical properties and wellbore instability mechanism in shale formation in Weiyuan Block, it was believed that the drilling fluid used in horizontal wells of this formation should have good performance in terms of inhibition, plugging and lubricity. The SM-ShaleMud water based drilling fluid suitable for deep shale gas horizontal wells was prepared by optimizing and selecting proper inhibitors, plugging agents and lubricants,, and the lab tests were conducted to evaluate its performance. The lab evaluation results showed that this drilling fluid had good rheological properties, high temperature high pressure (HTHP) fluid loss and low lubrication coefficient; SM-ShaleMud had temperature-resistance up to 140 °C, and presented good performance in inhibiting clay hydration and the generation and extension of fractures; this fluid system had been applied in three wells of Weiye 23 Platform in Weiyuan District, and achieved an excellent application effect. One point had to be stated that it ensured the wellbore stability after being soaked for 67 days, indicating the strong inhibition and plugging capacity. Research suggested that this water based drilling fluid system could solve the problem of wellbore instability in long horizontal section, and achieve a significant application effect, thereby demonstrating a good application prospective.

     

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