Progress of Borehole Stability Considering Strata Anisotropy

Yang Wenna; Ding Wenlong; Yin Shuai; Cong Sen; Zhao Wei; Zhang Min

doi:10.11867/j.issn.1001-8166.2015.11.1185

Advances in Earth Science >

2015 , Vol. 30 >Issue 11: 1218 - 1230

DOI: https://doi.org/10.11867/j.issn.1001-8166.2015.11.1185

Progress of Borehole Stability Considering Strata Anisotropy

Yang Wenna ,
Ding Wenlong ,
Yin Shuai ,
Cong Sen ,
Zhao Wei ,
Zhang Min

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1. School of Energy Resources, China University of Geosciences , Beijing 100083, China;
2. Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Abundance Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China;
3. Institute of Porous Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China;
4. Langfang Branch of PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China

First author: Yin Shuai (1989-), male, Xintai City, Shandong Province, Doctoral Candidate. Research areas include petroleum structure analysis and containment action, unconventional oil and gas structure and fracture and its relation with gas content. E-mail: speedsys@163.com

Received date: 2015-06-01

Revised date: 2015-10-15

Online published: 2015-11-20

Supported by

Project supported by the National Natural Science Foundation of China “Paleogene continental rich organic shale fracture research in Jiyang Depression of Bohai Bay Basin”(No.41372139), “Quantitative studies of marine organic matter rich shale fracture development degree and main controlling factors of south China in the lower Paleozoic”(No.41072098)

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Abstract

The research of borehole stability that considers strata anisotropy has great significance for the development of unconventional oil and gas reservoir. In this paper, based on the systematic research both at home and abroad in the recent ten years, the overview of the main progress of this research was provided. The main anisotropy factors that affect the borehole stability include the regional stress size, the nature of regional stress, the difference of rock physical and mechanical parameters, well structure, hydration swelling, micro-cracks, and the angle of weak bedding plane. The influence mechanism of single parameter on the borehole stability and the strata stress system were introduced in detail. The strength of rock had the most importance on the borehole stability. For the strata that has weak bedding plane, the strength of rock has great difference in different direction of drilling. When drilling along the weak bedding plane, it is easy to cause hydration swelling, and the micro-cracks always develop, and in this condition, borehole is easy to be unstable. Therefore, the high inhibition drilling fluid system or oil-based drilling fluid should be used and at the same time the influence of weak bedding plane on the borehole stability should be studied. When drilling in complex strata, these single factors can not always exist alone, but co-exist. As a result, the couple research of each single factor on the influence of borehole stability has great significance in establishing reasonable countermeasures. With the deep understanding of complex geological characteristics of unconventional oil and gas reservoir, the enhancement of the study of basic theory, numerical simulation and near realtime dynamic simulation research based on 3D visual modeling of borehole stability that considers strata anisotropy is the main developing direction in the future.

Key words： Borehole stability; Strata anisotropy; Weak bedding plane.

Cite this article

Yang Wenna , Ding Wenlong , Yin Shuai , Cong Sen , Zhao Wei , Zhang Min . Progress of Borehole Stability Considering Strata Anisotropy[J]. Advances in Earth Science, 2015 , 30(11) : 1218 -1230 . DOI: 10.11867/j.issn.1001-8166.2015.11.1185

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