Доступ предоставлен для: Guest
Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Porous Media
Импакт фактор: 1.752 5-летний Импакт фактор: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN Печать: 1091-028X
ISSN Онлайн: 1934-0508

Выпуски:
Том 23, 2020 Том 22, 2019 Том 21, 2018 Том 20, 2017 Том 19, 2016 Том 18, 2015 Том 17, 2014 Том 16, 2013 Том 15, 2012 Том 14, 2011 Том 13, 2010 Том 12, 2009 Том 11, 2008 Том 10, 2007 Том 9, 2006 Том 8, 2005 Том 7, 2004 Том 6, 2003 Том 5, 2002 Том 4, 2001 Том 3, 2000 Том 2, 1999 Том 1, 1998

Journal of Porous Media

DOI: 10.1615/JPorMedia.v12.i2.20
pages 119-130

Wellbore Instability of Directional Wells in Laminated and Naturally Fractured Shales

Talal M. AL-Bazali
College of Engineering & Petroleum, Kuwait University, Saudi Arabia
http://www.faculty.eng.kuniv.edu.kw/staff/albazali.jsp
Jianguo Zhang
Exploration and Production Technology, BP America Inc. Houston, Texas 77079
Chris Wolfe
Baker Hughes INTEQ, Houston, TX 77073, USA
Martin E. Chenevert
Department of Petroleum and Geosystems Engineering, University of Texas at Austin, Austin, TX 78712
Mukul M. Sharma
Department of Petroleum and Geosystems Engineering, University of Texas at Austin, Austin, TX 78712

Краткое описание

Many wellbore instability problems, such as wellbore collapse and lost circulation, occur in laminated and naturally fractured shales. These instability problems often lead to difficulty with hole cleaning, tripping, logging, and casing running, resulting in significant nonproductive time and increased costs. In this article, the stress distribution around deviated wellbores in laminated shale and sand sequences is analyzed and a modified model based on the single-plane-of-weakness theory is developed to predict the strength of laminated formations. Chemical effects resulting from the unfavorable interaction between the drilling fluid and the formation are also considered. If a chemical imbalance exists, additional wellbore instability may be encountered, which is generally worsened in naturally fractured intervals. Traditionally, nonaqueous fluids are chosen to reduce the impacts of chemically induced wellbore instability. In addition, it is generally accepted that increasing the drilling fluid salt concentration can enhance the borehole stability. This perception needs to be revised, particularly while drilling in naturally fractured shales. Both mechanical and chemical borehole instability models were applied in a case study to evaluate the potential for wellbore instability. In particular, bedding plane-related and chemically induced instability were addressed and overcome through comprehensive modeling and the deployment of modified operational procedures.


Articles with similar content:

Signal Processing and Physiological Modeling-Part II: Depth Model-Driven Analysis
Critical Reviews™ in Biomedical Engineering, Vol.30, 2002, issue 1-3
Jean-Louis Coatrieux
MODELING HERSCHEL−BULKELY DRILLING FLUID FLOW IN A VARIABLE RADIAL FRACTURE
Journal of Porous Media, Vol.17, 2014, issue 3
Lijun You, Song Li, Daqi Li, Chengyuan Xu, Yili Kang
EFFECTS OF POLYMER DISPERSION AND ADSORPTION ON IMMISCIBLE AND MISCIBLE VISCOUS INSTABILITIES DURING CHEMICAL ENHANCED OIL RECOVERY
Journal of Porous Media, Vol.22, 2019, issue 6
Abhijit Chaudhuri, R. Vishnudas
MACROSCOPIC AND MICROSCOPIC INVESTIGATION OF ALKALINE−SURFACTANT−POLYMER FLOODING IN HEAVY OIL RECOVERY USING FIVE-SPOT MICROMODELS: THE EFFECT OF SHALE GEOMETRY AND CONNATE WATER SATURATION
Journal of Porous Media, Vol.18, 2015, issue 8
Amin Mehranfar, Davood Rashtchian, Mohsen Masihi, Mohammad Hossein Ghazanfari
A REVIEW OF CHEMICAL AND MINERALOGICAL CONCERNS OF CO2 SEQUESTRATION IN DEEP SALINE AQUIFERS
Journal of Porous Media, Vol.22, 2019, issue 8
P. G. Ranjith, Tharaka Dilanka Rathnaweera, M. S. A. Perera