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Borehole instability

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Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-649
... Abstract: Exploration drilling in carbonate reservoirs has encountered a variety of drilling challenges due to high stresses, overpressure and risk of significant losses due to fractured rocks. In this study, borehole instability is assessed in several wells in a fractured carbonate play...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2137
... formation such as loss circulation and borehole breakout. In drilling through fractured carbonate formation in North China, excessive volume of cavings accompanied significant volume of mud loss. To better understand the mechanism of this instability, both laboratory experiment and numerical simulation...
Proceedings Papers

Paper presented at the SPE Middle East Oil and Gas Show and Conference, March 18–21, 2019
Paper Number: SPE-194711-MS
... is above the loss zone. The new casing seat choice has been successfully implemented at over 100 wells, with 100% success ending the borehole instability problems. Since then there has been no sidetrack or location plugged and abandoned for borehole instability in intermediate section. This paper...
Proceedings Papers

Paper presented at the SPE/IADC Middle East Drilling Technology Conference and Exhibition, January 29–31, 2018
Paper Number: SPE-189369-MS
... Abstract The major problems associated with shale formation when it interacted with water based mud are borehole instability. This Wellbore instability may be due to swelling and dispersion of clay present in shale and also leads to other well problems like pipe sticking, hole enlargement...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 7–10, 2016
Paper Number: SPE-183194-MS
... to cause borehole instability. This paper aims to unravel the geological factors that caused the borehole instability. Coaly shale observed in cores had long been believed to be the problematic HGRS. Therefore, we conducted litho-, chemo- and biostratigraphic analyses and well log evaluation on the coaly...
Proceedings Papers

Paper presented at the SPE Asia Pacific Unconventional Resources Conference and Exhibition, November 9–11, 2015
Paper Number: SPE-176991-MS
... to 2.2), long barefoot interval (up to 2138 m), borehole instability problem is easily encountered in dealing with the drilling of horizontal intervals of shale gas wells, which brings great challenges to drilling fluid technology. Maintaining wellbore stability is the most critical aspect of drilling...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, December 10–12, 2014
Paper Number: IPTC-17871-MS
... Abstract There exists a strong relationship between mud and borehole stabilities. Mud instability is associated with flocculation that is primarily caused by high active solids, high electrolyte concentration, and high temperature. Drilling in hot environments coupled with active or reactive...
Proceedings Papers

Paper presented at the SPWLA 20th Formation Evaluation Symposium of Japan, October 1–2, 2014
Paper Number: SPWLA-JFES-2014-Q
... Abstract Wellbore instability is a major challenge for the engineer evaluating the borehole and formation conditions during drilling. Instability issue is especially important to understand in areas with high stress variations, significant structure anisotropy, or pre-existing fractures system...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7771
... the unconfined compressive strength (UCS) for Saudi Arabian rocks. The output of this paper is a great addition to the rock mechanics and petroleum engineering disciplines especially in Borehole instability problems during drilling of oil and gas wells. reservoir geomechanics strength compression...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165133-MS
... of the wells in B depression were drilled under underbalanced conditions to improve exploration success rate and the drilling efficiency, and most of the wells were designed to be with the barefoot interval length of over 2000 m or even about 3500 m to save the cost. But the borehole instability often happened...
Proceedings Papers

Paper presented at the SPE Deepwater Drilling and Completions Conference, June 20–21, 2012
Paper Number: SPE-150714-MS
.... As a result of the serious stability problems encountered during the drilling operations in this section, the operator decided to perform a post-drill investigation of the experienced borehole instabilities. The main objectives were to identify mechanisms causing the experienced instabilities, as well...
Proceedings Papers

Paper presented at the North American Unconventional Gas Conference and Exhibition, June 14–16, 2011
Paper Number: SPE-143830-MS
... horizontal stress log analysis mitigate horizontal borehole instability mechanical property compressional borehole instability minimum horizontal stress upstream oil & gas borehole instability breakout mechanical earth model vertical stress caliper operator wellbore drilling mem...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, December 7–9, 2009
Paper Number: IPTC-13826-MS
... ABSTRACT Drilling with a bottomhole pressure less than the formation pore pressure (Underbalanced Drilling, UBD) usually increase the risk of borehole instability due to yielding or failure of the rock adjacent to the borehole. But evaluation criterion of this failure mechanism is complex...
Proceedings Papers

Paper presented at the IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition, November 13–15, 2006
Paper Number: SPE-103883-MS
... instability problems have happened in shale formations. In shale, heterogeneity and anisotropy are common nature. The low permeable nature makes fluid-solid coupled approach important, because the effective stress around borehole changes dynamically in such rocks (Detournay and Cheng, 1988). Also, micro...
Proceedings Papers

Paper presented at the SPE Asia Pacific Oil and Gas Conference and Exhibition, October 18–20, 2004
Paper Number: SPE-88610-MS
... Abstract This work presents the analysis of a borehole instability case at 2km in a seal formation within the oil field environment. Field observations of severe borehole instabilities are given. The factors causing this instability are observed as being due to cyclic mud pressure loading...
Proceedings Papers

Paper presented at the IADC/SPE Drilling Conference, February 26–28, 2002
Paper Number: SPE-74447-MS
... instability due to shear or tensile failure of the rock adjacent to the borehole. The extent of rock failure is very sensitive to the pressure in the annulus between the drill pipe, collars or BHA and the formation. The capacity of the drilling fluids to effectively circulate cuttings and cavings to surface...
Proceedings Papers

Paper presented at the SPE Middle East Oil Show, March 17–20, 2001
Paper Number: SPE-68095-MS
... and the upper bounds of the mud weight that will prevent the borehole from compressive and tensile failure, respectively. Thus, we generate the stable mud weight window using rock mechanical and in-situ stress data pertaining to the problem wells where instabilities have occurred. Then we compare the mud weight...
Proceedings Papers

Paper presented at the SPE/CIM Seventh One-Day Conference on Horizontal Well Technology, November 3, 1999
Paper Number: SPE-CIM-99-06-MS
... Abstract Borehole instability problems such as stuck pipe, hole enlargement causing poor hole cleaning, and deviation control often arise in the build sections of horizontal wells drilled from surface or as re-entries from existing vertical wells. A drilling fluid system with optimized density...
Proceedings Papers

Paper presented at the Vail Rocks 1999, The 37th U.S. Symposium on Rock Mechanics (USRMS), June 7–9, 1999
Paper Number: ARMA-99-0217
... interaction Reservoir Characterization orientation discontinuity finite element mesh principal stress principal stress direction Rock Mechanics for Indust Amadei, Kranz, Scott & Smeallie (eds) ¸ 1999 Balkema, Rotterdam, ISBN 90 5809 052 3 Analysis of borehole instability due to grouting pressure Jun...
Proceedings Papers

Paper presented at the SPE/ISRM Rock Mechanics in Petroleum Engineering, July 8–10, 1998
Paper Number: SPE-47285-MS
..., unstable, forming very large regions of cavings. An anisotropic elastic model for the stresses around the hole did not predict such a sudden change in behaviour. It was finally concluded that the borehole instability related to strength anisotropy associated with the pronounced bedding of the organic-rich...

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