高酸性活跃厚沥青层复杂碳酸盐岩油田钻完井关键技术

doi:10.7623/syxb202107010

石油学报 ›› 2021, Vol. 42 ›› Issue (7): 962-970.DOI: 10.7623/syxb202107010

高酸性活跃厚沥青层复杂碳酸盐岩油田钻完井关键技术

路保平

中国石油化工股份有限公司石油工程技术研究院北京 102206

收稿日期:2020-09-01 修回日期:2021-04-29 出版日期:2021-07-25 发布日期:2021-08-04
作者简介:路保平,男,1962年1月生,1982年获华东石油学院学士学位,2001年获石油大学(北京)油气井工程专业博士学位,现为中国石油化工股份有限公司石油工程技术研究院正高级工程师、博士生导师,主要从事地质因素描述、深井超深井与页岩油气钻完井方面的研究工作。Email:lubp.sripe@sinopec.com
基金资助:
国家自然科学基金企业创新发展联合基金项目"海相深层地层孔隙压力形成机理及预测方法探索"（No.U19B6003-05-01）、国家科技重大专项"低渗透油气藏高效开发钻完井技术"（2016ZX05021）和中国石油化工股份有限公司重大科技攻关项目"特深层勘探开发工程关键技术与装备"（P17049）资助。

A key technology for drilling and completion in complex carbonate oilfields with highly acid and active thick asphalt layers

Lu Baoping

Sinopec Research Institute of Petroleum Engineering, Beijing 102206, China

Received:2020-09-01 Revised:2021-04-29 Online:2021-07-25 Published:2021-08-04

摘要/Abstract

摘要： 典型的高酸性复杂碳酸盐岩油藏——YD油田的碳酸盐岩储层厚度达3 km，具有活跃厚沥青层漏喷同存、地层多腐蚀介质、多套地层压力体系并存等特点，钻井过程中存在碳酸盐岩地层孔隙压力预测困难、沥青侵入严重、多腐蚀介质导致井筒完整性难以保障、钻井周期长、长井段均匀改造难度大等难题，通过技术攻关研究，形成了碳酸盐岩地层孔隙压力预测、监测和检测技术，揭示了沥青与钻井液置换机理，提出了以堵代压的活跃厚沥青层安全钻井技术，形成了高酸性多腐蚀介质并存条件下井筒完整性保障和长井段均匀酸化改造等为核心的高酸性活跃厚沥青层复杂碳酸盐岩油田钻完井关键技术。该技术在YD油田55口井进行了现场应用，平均机械钻速提高了45.5%，钻井周期缩短了44.5%，大大降低了钻完井成本，有力保障了该油田一期产能建设的完成，也为国内外类似碳酸盐岩油田的高效勘探开发提供了借鉴。

关键词: 碳酸盐岩, 高酸性, 沥青层, 钻完井, 压力预测, 安全钻井, 关键技术

Abstract: With the thickness of carbonate reservoirs up to 3 000 m, the YD oilfield is characterized by coexistence of blowout and lost circulation in active thick asphalt layers, multiple corrosive media in the formation, and coexistence of multiple formation pressure systems. There are problems such as severe bitumen intrusion, long drilling cycles, and difficulties in predicting pore pressure, guaranteeing wellbore integrity due to multiple corrosive media, and uniformly transforming long well sections in carbonate formations during drilling. Through technical research, this study has established the prediction, monitoring and detecting technology of the pore pressure in carbonate formations, reveals the replacement mechanism of asphalt and drilling fluid, and proposes a safe drilling technology for active thick asphalt layers with plugging instead of well killing, forming a key technology for drilling and completion in complex carbonate oilfields with highly acid and active thick asphalt layers, which focuses on wellbore integrity and uniform acidification transformation of long well sections under the coexistence of highly acid and multiple corrosive media. The technology was applied on-site in 55 wells of the YD oilfield. The average rate of penetration was increased by 45.5%, and the drilling cycle was shortened by 44.5%, which greatly reduced the cost of drilling and completion and effectively guaranteed the completion of the first-stage productivity construction of the oilfield. It provides a reference for the efficient exploration and development of similar carbonate oilfields at home and abroad.

Key words: carbonate rock, high acidity, asphalt layer, drilling and completion, pressure prediction, safe drilling, key technology

中图分类号:

路保平. 高酸性活跃厚沥青层复杂碳酸盐岩油田钻完井关键技术[J]. 石油学报, 2021, 42(7): 962-970.

Lu Baoping. A key technology for drilling and completion in complex carbonate oilfields with highly acid and active thick asphalt layers[J]. Acta Petrolei Sinica, 2021, 42(7): 962-970.

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高酸性活跃厚沥青层复杂碳酸盐岩油田钻完井关键技术

A key technology for drilling and completion in complex carbonate oilfields with highly acid and active thick asphalt layers

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