Abstract
During offshore drilling operation, mudstone formation is vulnerable to drilling fluid immersion, which would cause hydration swelling and imbibition diffusion, rock strength reduction, and wellbore instability. This paper takes #5 Well in BZ Block as an example and analyzes its wellbore stability by taking into account the influence of drilling fluid immersion on rock strength and introducing the hydration damage coefficient. The analysis results show that: (1) with the increase of formation exposure time, the drilling fluid invasion amount increases gradually, and Young’s modulus of rock can reduce by 32.55% at most; (2) the wellbore stability analysis model considering hydration damage accords with the actual application results better than traditional models; and (3) the wellbore instability is concentrated in the upper and middle formations, and the window of mud density in the formation above 1200m is too narrow to be controlled. Therefore, it is suggested that in the process of drilling at this point the drilling fluid density be raised moderately, but not exceeding the equivalent density of fracture pressure, preferably at about 1.4 g/cm3. This paper proposes a method of judging the degree of drilling fluid invasion and reveals the wellbore instability mechanism in this block to some extent, which is of guiding significance to the reduction of drilling risks in the block.
Copyright 2022, IFEDC Organizing Committee
This paper was prepared for presentation at the 2022 International Field Exploration and Development Conference in Xi’an, China, 16–18 November 2022.
This paper was selected for presentation by the IFEDC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC Technical Team and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Technical Committee its members. Papers presented at the Conference are subject to publication review by Professional Team of IFEDC Technical Committee. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of IFEDC Organizing Committee is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC. Contact email: paper@ifedc.org.
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Jiang, Sl., Tan, Zj., Zhang, Gq., Mu, Gp., Feng, El., Yuan, Rg. (2023). Wellbore Stability Analysis Model Considering Hydration Damage. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2022. IFEDC 2022. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-99-1964-2_16
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