Study on lost circulation mechanism in fractured formation: a case study of BZ34-9 Oilfield, Bohai Sea, East China#br#

doi:10.3969/j.issn.1672-7703.2021.02.013

Abstract

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.

CLC Number:

TE282

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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