渤海海域裂缝性地层井漏机理研究——以渤中34-9 油田为例

doi:10.3969/j.issn.1672-7703.2021.02.013

摘要/Abstract

摘要： 渤中34-9 油田裂缝性地层井漏频次高、漏失规模大，严重影响油田开发进度和成本。基于渤中34-9 油田井漏特征、漏失通道类型、成因和井漏动力学机制分析了渤中34-9 油田裂缝性地层井漏机理，提出了地层弱面结构发育是井漏的必要条件、正压差是井漏的主要动力、井漏是过平衡钻井条件下井筒压力—应力—应变再平衡的结果，并针对性配套相应的防漏措施。实践表明，控制井底压差是预防裂缝性地层井漏的有效措施之一，建议在工程施工过程中将存在弱面结构的地层视为非均质模型处理，以实际弱面结构的承压能力和应力敏感性为约束，优化井身结构、钻井液参数和钻井参数，提前避漏、防漏。

关键词: 井漏, 弱面结构, 火山岩, 断层裂缝, 火山通道, 井眼应变, 压裂漏失, 裂缝扩展

Abstract: Lost circulation brings great challenges to petroleum engineering. Bozhong 34-9 Oilfield has experienced high frequency
and large-scale lost circulation in fractured formation, which seriously reduced development progress and increased operation
cost. In this paper, the characteristics, types of leakage channel, causation and dynamics of lost circulation in Bozhong
34-9 Oilfield are studied, and the mechanisms of lost circulation in fractured formation analyzed. The result shows that the existence of weak plane texture inevitably leads to lost circulation and the positive pressure differential is the main driving force of
well leakage. On the whole, lost circulation is the rebalance of wellbore pressure-stress-strain in the process of over-balanced
drilling operation. In addition, supporting measures for preventing lost circulation are proposed. Practice indicates that one of the
effective measures in fractured formation is to control the bottom hole pressure differential. Formation with weak plane texture
should be regarded as a heterogeneous geological model, and well structure, drilling fluid and other drilling parameters be optimized and constrained by pressure bearing strength and stress sensitivity of the weak plane, to avoid and prevent well leakage in advance.

中图分类号:

TE282

谭忠健, 胡云, 袁亚东, 曹军, 张向前, 杨占许. 渤海海域裂缝性地层井漏机理研究——以渤中34-9 油田为例[J]. 中国石油勘探, 2021, 26(2): 127-136.

Tan Zhongjian, Hu Yun, Yuan Yadong, Cao Jun, Zhang Xiangqian, Yang Zhanxu. Study on lost circulation mechanism in fractured formation: a case study of BZ34-9 Oilfield, Bohai Sea, East China#br#[J]. China Petroleum Exploration, 2021, 26(2): 127-136.

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