Borehole-Stability Model To Couple the Mechanics and Chemistry of Drilling-Fluid/Shale Interactions

Mody, F.K.; Hale, A.H.

doi:10.2118/25728-pa

Cited by 238 publications

(131 citation statements)

References 9 publications

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“…Equivalent density of pore pressure, Pp = 1.03g/cm 3 . Equivalent density of in-situ stress, 3 . Azimuth of maximum horizontal principle stress, = 75°, and the displacement, Q=3.8m 3 /min.…”

Section: Field Applicationmentioning

confidence: 99%

“…The calculated equivalent mud density of collapse pressure in the horizontal interval was 1.25g/cm 3 , but in order to avoid reservoir damage, the lower mud density (1.10g/cm 3 ) was used, which cannot keep borehole stability effectively, so some drilling accidents occurred which needed some measures to deal with. In addition, in the highly-deviated well section (well deviation angle 85°), the calculated equivalent mud density of collapse pressure was 1.23g/cm 3 , and the used mud density was 1.23 g/cm 3 , which can keep borehole stability effectively, so the drilling process in the section went smoothly. Finally, the vertical rate of the ERW was high to 2.3, and the horizontal displacement extended to 3460m, which was within the limited depth.…”

Section: Fig (6)mentioning

confidence: 99%

“…Over the years, although a large number of models for borehole stability have been developed [2][3][4][5], the focus of these models was generally on the mechanical analysis, the influence of hydraulics factors has been paid little attention, which often leads to a serious drilling accident such as the drilling fluid leakage in the ERW. In addition, due to neglecting shale hydration, the formation strength and the solid concentration in annulus are both regarded relatively conservatively [6], which leads to some errors for the selection of safety mud density.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Borehole Stability in Shale Formation for Extended Reach Wells

Zhao¹,

Deng²,

Tan³

et al. 2014

TOPEJ

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Abstract:In recent years, Extended reach well (ERW) drilling technology is widely used in the offshore oil & gas fields in order to reduce the number of the drilling platforms. As it has notable characteristics such as the high deviation angle, large horizontal displacement and long open borehole interval the borehole stability increases the drilling risk and cost dramatically. To research the ERW borehole stability, including mechanical model, shale hydration test and the effect of circulating pressure loss in this paper, rock mechanics theory and hydraulics principle were comprehensively applied . The results show that, the safer drilling azimuth of the ERW in normal fault lies in the minimum horizontal principle stress direction; hydration radius increases with the passage of time, and the hydration collapsed rock has important influence on cutting beds and circulating pressure loss in annulus; the upper limit value of safety mud density decreases with the well depth increases, and when it deceases to the equivalent mud density of collapse pressure, the limit depth of the ERW is obtained. The research results provide relevant guidance on the ERW drilling, which can be used to determine the upper and lower safety mud weight limits, the best well trajectory selections and the well structure design.

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Section: Field Applicationmentioning

confidence: 99%

Section: Fig (6)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Borehole Stability in Shale Formation for Extended Reach Wells

Zhao¹,

Deng²,

Tan³

et al. 2014

TOPEJ

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“…Wellbore instability is not only a pure rock mechanical problem, the interaction of drilling fluid and shale while drilling is a more important influence factor [5].…”

Section: Coefficient Of Water Diffusionmentioning

confidence: 99%

Rock mechanical characteristic and wellbore stability in «Kingfisher» oilfield of Uganda

2013

SOCAR Proceedings

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Shale in the "Kingfisher" оil field is easy to hydrate and often causes wellbore collapse during drilling, which can impact the efficiency of drilling. In order to solve the problem of shale collapse, the change of shale mechanical properties affected by drilling fluid are studied through experiments. The relationships between the shale mechanical parameters and the water content are established. Further, profiles of rock mechanical parameters in the "Kingfisher" оil field are also established based on the experiments. The results show that the formation in the "Kingfisher" оil field is soft and easily hydrated. Wellbore stability of the "Kingfisher" оil field is analyzed to establish the timedependent collapse pressure. The collapse pressure of shale increases sharply a short time after drilling and then slows down gradually. After 10 days the collapse pressure will no longer change. The study results will provide a basis of the drilling program in the "Kingfisher" оil field based upon the research of the shale hydration collapse period.

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“…Studies such as pressure transmission tests are carried out to measure the effect of anions, cations and salts present in injected fluid that affect shale-fluid interaction (van Oort et al 1995;Ghassemi and Diek 2003). The presence of ions in injected fluid alters the membrane efficiency of shale, thereby influencing ion transport from the fluid to the shale that causes the shale to swell/disperse (Zhang, et al 2006;Mody and Hale 1993;van Oort 2003;Al-Bazali 2005).…”

Section: Introductionmentioning

confidence: 99%

Quantitative characterization of polyacrylamide–shale interaction under various saline conditions

et al. 2017

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Interaction of polymer-containing injected fluids with shale is a widely studied phenomenon, but much is still unknown about the interaction of charged polyacrylamides such as anionic and cationic polyacrylamides with shale. The nature of interaction of charged polyacrylamides with shale is not well understood, especially from the perspective of assessing the potential for polyacrylamides to cause formation damage. Zeta potential and rheological measurements were made for Chattanooga and Pride Mountain shales suspended in polyacrylamide solutions with and without inorganic salts and tetramethyl ammonium chloride (TMAC). The change in zeta potential and viscosity with time was recorded. The magnitude of decrease in the absolute value of zeta potential with time is indicative of adsorption of polymer on the surface of shale and serves as a measure of the extent of polymer interaction with shale. The salts that were used in this study are potassium chloride (KCl), sodium chloride (NaCl). This study quantified the interaction of anionic and cationic polyacrylamide with different North American shales. From the experimental results, it was determined that the polyacrylamides can interact strongly with shale, particularly the cationic polyacrylamide. The objective of this study was to determine the extent of interaction of anionic and cationic polyacrylamide with each shale sample in the presence of additives such as salts.

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Borehole-Stability Model To Couple the Mechanics and Chemistry of Drilling-Fluid/Shale Interactions

Cited by 238 publications

References 9 publications

Borehole Stability in Shale Formation for Extended Reach Wells

Borehole Stability in Shale Formation for Extended Reach Wells

Rock mechanical characteristic and wellbore stability in «Kingfisher» oilfield of Uganda

Quantitative characterization of polyacrylamide–shale interaction under various saline conditions

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