林永学, 王伟吉, 金军斌. 顺北油气田鹰1井超深井段钻井液关键技术[J]. 石油钻探技术, 2019, 47(3): 113-120. DOI: 10.11911/syztjs.2019068
引用本文: 林永学, 王伟吉, 金军斌. 顺北油气田鹰1井超深井段钻井液关键技术[J]. 石油钻探技术, 2019, 47(3): 113-120. DOI: 10.11911/syztjs.2019068
LIN Yongxue, WANG Weiji, JIN Junbin. Key Drilling Fluid Technology in the Ultra Deep Section of Well Ying-1 in the Shunbei Oil and Gas Field[J]. Petroleum Drilling Techniques, 2019, 47(3): 113-120. DOI: 10.11911/syztjs.2019068
Citation: LIN Yongxue, WANG Weiji, JIN Junbin. Key Drilling Fluid Technology in the Ultra Deep Section of Well Ying-1 in the Shunbei Oil and Gas Field[J]. Petroleum Drilling Techniques, 2019, 47(3): 113-120. DOI: 10.11911/syztjs.2019068

顺北油气田鹰1井超深井段钻井液关键技术

Key Drilling Fluid Technology in the Ultra Deep Section of Well Ying-1 in the Shunbei Oil and Gas Field

  • 摘要: 鹰1井是顺北油气田的一口超深重点风险预探井,设计井深9 016.85 m(垂深8 603.00 m)。该井超深井段志留系柯坪塔格组与奥陶系桑塔木组等硬脆性泥岩地层、志留系裂缝性地层和奥陶系破碎性地层,在钻进过程中易出现井眼失稳、井漏、坍塌掉块等井下故障。为此,通过室内试验研究,分析了该井超深井段硬脆性泥岩地层井眼失稳机理、强压力敏感性裂缝性地层漏失原因及破碎性碳酸盐岩地层井眼失稳原因,应用“多元协同”井壁稳定基本理论,构建了SMHP–1强抑制强封堵钻井液,并制定了针对性强的防塌防漏技术措施。该井顺利钻穿大段硬脆性泥岩、裂缝性地层和破碎性地层,未发生井眼失稳及钻井液漏失,顺利钻至井深8 588.00 m完钻,创亚洲陆上井深最深纪录。现场应用表明,SMHP–1强抑制强封堵钻井液能够解决深部地层大段泥岩及破碎性地层的井眼失稳与漏失难题,为国内外深井超深井安全钻进提供了技术借鉴。

     

    Abstract: Well Ying-1 is an ultra-deep key investigative risk management pre-exploration well deployed by Sinopec in the Shunbei Oil and Gas Field with designed well depth of 9 016.85 m (TVD 8 603.00 m). Drilling the welln encountered downhole problems including wellbore instability, well leakage and borehole wall sloughing. They also easily occur in drilling hard brittle mudstone formations, such as the Silurian Kepingtage Formation and the Ordovician Sangtamu Formation. For this reason, laboratory studies have been carried out to analyze mechanisms contributing to the instability of large section of hard brittle mudstone shale. As such, the reasons for leakage in the Silurian high pressure sensitive fissured formation, and the reasons for instability in Ordovician fractured formations. Based on the basic theory of " multivariate synergistic” wellbore stability, the drilling fluid system SMHP-1 with strong inhibition and sealing capacity was constructed, and the technical measures of mud loss and borehole wall collapse prevention were worked out. The well successfully drilled through a large section of hard brittle mudstone and broken formation to a total depth of 8 588 m without borehole wall instability and drilling fluid loss, setting a record of the deepest onshore well depth in Asia. The field application showed that the drilling fluid system SMHP-1 could effectively solve the problems of wellbore stability and leakage in deep mudstone and broken formations by strong inhibition and sealing capacity, and provide best practices for safe drilling of deep or ultra-deep wells at home and abroad.

     

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