Wellbore Stabilization Increases Fracture Gradients and Controls Losses/Flows 
During Drilling

Sweatman, Ron; Wang, Hong; Xenakis, Harry

doi:10.2523/88701-ms

Cited by 14 publications

(6 citation statements)

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“…Simple models may model fracture width and could be used to identify LCM and/or chemical treatments to help prevent lost circulation. 4 The importance of preplanning and using LCMs has been discussed by various authors. [5][6][7][8][9][10] Design of optimum LCMs and chemical treatments should become an integral part of a successful engineering approach to control loss circulation.…”

Section: Planningmentioning

confidence: 99%

Cementing Technology for Low Fracture Gradient and Controlling Loss Circulation

Krishna¹,

Savery²,

Reddy³

et al. 2006

Proceedings of SPE/IADC Indian Drilling Technology Conference and Exhibition

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TX 75083-3836, U.S.A., fax 1.972.952.9435. AbstractThe main objectives in well construction are to maximize reservoir deliverability, reduce remedial jobs, and minimize nonproductive time (NPT) during drilling and cementing. One of the key factors to help maximize reservoir deliverability is the ability to reach the target reservoir depth with a minimum number of casing points and maximum production tubing size for the completion. Losses during drilling and cementing should be controlled to reduce unplanned casing points and minimize the NPT.These challenges are severe in depleted and low-fracturegradient formations. Engineered solutions to control loss circulation and to place cement slurry in these environments are presented and discussed. Controlling loss of circulation during well construction is more than just selecting the proper type of lost circulation material (LCM). The engineered solution discussed in this paper correlates the formation and LCM properties for effective control of losses. In situations where LCM alone may not reduce the losses, the use of chemical sealants such as polymers and special cement systems are discussed. The special cement systems can be designed to meet the specific needs such as acid solubility for easy removal, thixotropy, and filtrate loss.Cement slurry for primary cementing across low-fracturegradient and depleted formations should be designed to meet the density requirement so that it can be placed in the annulus and losses can be minimized. Ultra-low-density cement slurries, as low as 5.4 lbm/gal, are presented and discussed. Case histories are also presented to illustrate field implementation procedures, and the optimization of cement slurry designs to meet well requirements is discussed as well.The results presented in this paper can be applied in well construction to control loss circulation and cementing across depleted and low-fracture-gradient formations, which ultimately should help reduce NPT and maximize well production.

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Section: Planningmentioning

confidence: 99%

Cementing Technology for Low Fracture Gradient and Controlling Loss Circulation

Krishna¹,

Savery²,

Reddy³

et al. 2006

Proceedings of SPE/IADC Indian Drilling Technology Conference and Exhibition

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show abstract

“…22 We cannot afford, as an industry, to lose billions of dollars on Geomechanics-related non-productive time (NPT) and associated loss in revenues. 32 Over the past decade, for the drilling industry on an average twenty two percent of the drilling budget can be attributed to wellbore related NPT. Fifty percent of this NPT is associated with geomechanics related (i.e.…”

Section: Controlling Costsmentioning

confidence: 99%

“…issues. 1,8,11,22,32 In spite of advances in technology, this NPT percentage associated with borehole related problems has not drastically changed over the past decade. NPT percentage of the total drilling budget is much too high and must be lowered to a more acceptable level.…”

Section: Controlling Costsmentioning

confidence: 99%

Bridging the Gap: Challenges in Deploying Leading Edge Geomechanics Technology to Reducing Well Construction Costs

Mody

2006

Proceedings of SPE/IADC Indian Drilling Technology Conference and Exhibition

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“…Drilling reports and post-treatment torque and drag data support this analysis. This normalized stress model was used as input into a treatment simulator 22 for designing a DVC sealant treatment. The well was treated successfully and allowed the operator to penetrate multiple pay zones far below the shoe.…”

Section: Rock-based Design Processmentioning

confidence: 99%

The Key to Successfully Applying Today's Lost Circulation Solutions

Wang

Sweatman

Engelman

et al. 2005

SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThough strengthening boreholes with particulate treated mud has achieved tremendous success in the past year, the theory behind the process still has not been widely accepted. Rock mechanics analysis and laboratory data review are performed in this paper to illustrate deepened understanding on some key points that are controversial. Algorithms have been developed and demonstrated for obtaining critical parameters in designing such jobs for improving hoop stress, by which a wellbore can be strengthened while drilling.Discussion of mechanisms and case histories has led to the development of systems that are designed to improve wellbore-pressure containment (WPC) by improving least principal stress. These systems are designed to function independent of formation permeability, unlike high fluid-loss and high solid-content squeeze pills. This method is normally applied when long fractures exist and when lost circulation has occurred.Since the first approach is proactive and the latter remedial or corrective, combining the two approaches can create synergy for borehole strengthening.A computer-aided design (CAD) process is also demonstrated for better use of available information in designing a deformable, viscous, and cohesive (DVC) system.

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Wellbore Stabilization Increases Fracture Gradients and Controls Losses/Flows During Drilling

Cited by 14 publications

References 0 publications

Cementing Technology for Low Fracture Gradient and Controlling Loss Circulation

Cementing Technology for Low Fracture Gradient and Controlling Loss Circulation

Bridging the Gap: Challenges in Deploying Leading Edge Geomechanics Technology to Reducing Well Construction Costs

The Key to Successfully Applying Today's Lost Circulation Solutions

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