Mechanisms of Borehole Wall Destabilization in Drilling Shale Formations in the Central Part of Block Jinzhou-25-1 in Bohai Basin and Drilling Fluid Countermeasures

GENG Lijun; LIU Feng; GANG peng; DONG Xinrou; LIU Wei; LI Bojia

doi:10.12358/j.issn.1001-5620.2025.01.006

Volume 42 Issue 1

Feb. 2025

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GENG Lijun, LIU Feng, GANG peng, et al.Mechanisms of borehole wall destabilization in drilling shale formations in the central part of block jinzhou-25-1 in bohai basin and drilling fluid countermeasures[J]. Drilling Fluid & Completion Fluid，2025, 42（1）：58-65 doi: 10.12358/j.issn.1001-5620.2025.01.006

Citation:

GENG Lijun, LIU Feng, GANG peng, et al.Mechanisms of borehole wall destabilization in drilling shale formations in the central part of block jinzhou-25-1 in bohai basin and drilling fluid countermeasures[J]. Drilling Fluid & Completion Fluid，2025, 42（1）：58-65 doi: 10.12358/j.issn.1001-5620.2025.01.006

Citation:

GENG Lijun, LIU Feng, GANG peng, et al.Mechanisms of borehole wall destabilization in drilling shale formations in the central part of block jinzhou-25-1 in bohai basin and drilling fluid countermeasures[J]. Drilling Fluid & Completion Fluid，2025, 42（1）：58-65 doi: 10.12358/j.issn.1001-5620.2025.01.006

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Mechanisms of Borehole Wall Destabilization in Drilling Shale Formations in the Central Part of Block Jinzhou-25-1 in Bohai Basin and Drilling Fluid Countermeasures

doi: 10.12358/j.issn.1001-5620.2025.01.006

1.
Tianjin Branch of CNOOC (China) Limited, Tianjin 300452
2.
Cnooc Energy Development Co., LTD., Tianjin 300452
3.
State Key Laboratory of Petroleum Resources and Exploration, China University of Petroleum, Beijing 102249

Received Date: 2024-08-04
Rev Recd Date: 2024-10-18
Publish Date: 2025-02-01

Abstract

Abstract

Well drilling in the central part of the block Jinzhou-25-1 in Bohai basin has frequently encountered borehole wall destabilization when drilling the Dongying formation shales. Based on the analyses of the components and structure of the shales as well as the measurement of their mechanical properties, it was found that the borehole wall destabilizes mainly in two mechanisms, first is the weakening of the shales caused by hydration and swelling, second is the shearing slip of the formations along the bedding planes. Based on this understanding, a water based drilling fluid PEM and a synthetic based drilling fluid BIODRILL S were compared for their performance from several aspects such as basic properties, plugging capacity, inhibitive capacity and the ability to maintain mechanical strength of a formation etc. It was found that the BIODRILL S drilling fluid has several advantages over the PEM drilling fluid, such as high percentage of shale cuttings recovery in hot rolling test, lower linear expansion rate, lower high temperature high pressure filtration rate as well as better performance in maintaining the mechanical strength of the shale formations. A nano-latex plugging agent PF-NSEAL was added into the BIODRILL S drilling fluid at concentrations between 2% and 2.5%, rendering it better microfracture plugging performance. In field operation, the optimized BIODRILL S drilling fluid was used to drill two extended reach wells, the number of downhole problems was greatly reduced, and the drilling rate was increased by 43.7%. The use of the optimized BIODRILL S synthetic based drilling fluid has provided a technical support for solving the borehole wall destabilization problem encountered in block Jinzhou-25-1.
- Block Jinzhou-25-1,
- Mud shale,
- Borehole wall destabilization,
- Drilling fluid,
- Plugging property

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References(18)

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Mechanisms of Borehole Wall Destabilization in Drilling Shale Formations in the Central Part of Block Jinzhou-25-1 in Bohai Basin and Drilling Fluid Countermeasures

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Mechanisms of Borehole Wall Destabilization in Drilling Shale Formations in the Central Part of Block Jinzhou-25-1 in Bohai Basin and Drilling Fluid Countermeasures

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