Casing While Drilling (CwD): A New Approach To Drilling Fiqa Formation in the Sultanate of Oman—A Success Story

Sánchez, Francisco Javier Martín; Houqani, Said; Turki, Mounir; Cruz, Marco

doi:10.2118/136107-pa

Cited by 20 publications

(11 citation statements)

References 10 publications

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“…Several examples from applications around the world include Canadian arctic permafrost by Vrielink et al (2008), Lobo field in south Texas by Fontenot (2003), in Brazil by Placido et al (2005 and, Mississippi Canyon by Rosenberg and Gala (2012), in Peruvian Jungle by Beaumont et al (2010), in Saudi Arabia by Chima et al (2012), in Gabon by Askew et al (2011), in San Juan basin by Robinson et al (2008), and finally in Oman by Sanchez et al (2012). The theory behind the field observations has not been fully understood yet.…”

Section: Introductionmentioning

confidence: 99%

Computational Modeling of Drilling Fluids Dynamics in Casing Drilling

Mokhtari

Ermila

Tutuncu

et al. 2012

SPE Eastern Regional Meeting

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Casing drilling is used as an alternative to conventional drilling with drillpipe in order to reduce non-productive time. The smaller annular space in casing drilling elevates the annular pressure loss considerably at similar flow rates in conventional drilling. Consequently, the Equivalent Circulating Density (ECD) is more affected by annular drilling fluid dynamics in casing drilling than the conventional drilling. The higher ECD experienced in casing drilling brings concerns about exceeding fracture gradient which can lead to induced lost circulation. However, several field observations demonstrate successful application of casing drilling in combating lost circulation and strengthening the wellbore.Smearing effect theory backed by smaller cuttings at the shale shaker, eccentric casing wear, and discrepancy between analytical and field measurements are three main evidences for potential significant eccentricity in casing drilling operations. This paper demonstrates the inherent eccentricity of casing drilling as one of the parameters that controls the annular pressure losses. Eccentricity reduces the velocity in the narrow section of annulus. Similarly, it reduces the annular pressure losses considerably. In addition, controlling the fluid rheological properties as well as the flow rate are recommended to manage the casing drilling hydraulics. This comprehensive study of pressure loss and velocity profile at various annular sizes can help analyzing several field observations and designing the hydraulics of drilling operations.

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Section: Introductionmentioning

confidence: 99%

Computational Modeling of Drilling Fluids Dynamics in Casing Drilling

Mokhtari

Ermila

Tutuncu

et al. 2012

SPE Eastern Regional Meeting

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“…Larger diameter provides a small pressure drop inside casing but also increases in annular space (Sanchez et al 2012). That means ECD could be higher, which can be alarming, especially in drilling horizontal wells.…”

Section: Hydraulicsmentioning

confidence: 99%

“…Therefore, the team should be focused on providing enough hydraulic energy to clean the bit and prevent the bit balling with high jet velocity, remove cuttings rapidly in order to avoid accumulation inside tight-clearance annulus and flowline, and reduce overall energy consumption (Sanchez et al 2012). …”

Section: Hydraulicsmentioning

confidence: 99%

Review of casing while drilling technology

Pavkovic

Bizjak

Petrović

2016

Pod Rad

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Conventional drilling methods have been plagued with huge operational and financial challenges, such as cost of purchasing, inspecting, handling, transporting the drill equipment and most importantly, tripping in-and-out of the drill string whenever the Bottom Hole Assembly (BHA) needs a replacement, needs of wiper trip or when total depth is reached. The tripping in-and-out of the drill string not only contributes to Non Productive Time (NPT) but also leads to well control difficulties including wellbore instability and lost circulation. All this has led Oil and Gas industry, as well as any other engineering industry, to seek for new ways and methods in order to reduce these problems. Thanks to the advances in technical solutions and constant improvements of conventional drilling methods, a new drilling method -casing while drilling has been developed. Casing Drilling encompasses the process of simultaneously drilling and casing a well, using the active casing and thus optimizes the production. This paper presents a review of casing while drilling method (CwD) and its practical usage in drilling wells. The comparison of conventional drilling method and casing while drilling is also presented. The CwD method achieves significantly better results than conventional drilling method. Keywords: casing, drilling, CwD, application Apstrakt: Konvencionalne metode bušenja se suočavaju sa raznim operativnim i finansijskim izazovima poput troškova nabavke, inspekcije, održavanja i transporta opreme za bušenje, a najviše sa konstantnim manevrom bušaćeg alata bilo da je potrebno da se proradi izbušeni interval, da se zameni kompozicija teškog alata ili po dostizanju konačne dubine bušotine. Konstantan manevar bušaćeg alata doprinosi ne samo povećanju neproduktivnog vremena već i poteškoćama prilikom bušenja, ukljućujući i nestabilnost kanala bušotine kao i gubitak cirkulacije. Svi navedeni problemi doveli su do razvoja novih rešenja i metoda među kojima se posebno istakla nova metoda bušenja -metoda bušenja kolonom zaštitnih cevi (casing while drilling). Casing while drilling metoda objedinjuje proces bušenja i cementacije bušotina i na taj način rešava probleme konvencionalnog bušenja. Ovaj rad opisuje novu metodu bušenja pomoću kolone zaštitnih cevi -casing while drilling (CwD) kao i njenu praktičnu primenu u procesu bušenja. Izvršeno je poređenje konvencionalne metode bušenja i CwD metode i iz svih opisanih studija slučaja ustanovljeno je da CwD metoda pruža bolje performanse od konvencionalnog bušenja.

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“…Recent advances in CWD technology Warren et al 2004;Plácido et al 2005;Strickler et al 2005;Warren and Lesso 2005;Sanchez et al 2012) have demonstrated applications of CWD using rotary-steerable assemblies to drill directional wells and, more recently, high-dogleg, high-turn well paths through unstable formations (Avery et al 2009;Chima et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…This operation simplifies the process of removing cuttings, seems to assist in mitigating losses, and, most importantly, derisks the well by removing the operations that typically have the highest risks. In the last decade, directional CWD technologies have emerged as a consequence of the significant advantages observed on vertical drilled wells (Plácido et al 2005;Chima et al 2012;Sanchez et al 2012). The use of CWD with a retrievable bottomhole assembly (BHA) ) (CWD Level 3; Fig.…”

Section: Introductionmentioning

confidence: 99%

Casing During Drilling With Rotary-Steerable Technology in the Stag Field—Offshore Australia

Graves

Herrera

2013

SPE Drilling &Amp; Completion

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Summary Originally discovered in 1993, the Stag oil field, located on the Northwest shelf of Western Australia, has produced more than 58 million bbl since production began in 1998 (Goodacre et al. 2000). The field is shallow (680 m subsea), encompassing highly unconsolidated and highly permeable sandstone. Reservoir depletion, unconsolidated rock, water breakthrough, and sand production have created conditions under which infill-drilling campaigns have become increasingly problematic in the Stag field in recent years. There have been numerous papers documenting the history of the Stag field (McDiarmid et al. 2001; Muecke et al. 2002; Wibawa et al. 2008). On three recent infill wells, the intermediate 12¼-in. intervals were drilled and cased with casing-while-drilling (CWD) technology with a rotary-steerable system (RSS). This was used to navigate wellbore congestion, to drill designer well paths to avoid "incoherencies" [a seismic attribute that is mappable and correlates with drilling problems (Chima et al. 2012)], to land the horizontal section, and then to drill horizontal tangent sections out to the initial reservoir penetration (liner point). The CWD applications progressed from a "new technology" trial to a stretch reach and performance goal, to finally successfully being used as a key enabling technology to drill a well that might otherwise be undrillable because of instability issues. The directional CWD 12¼-in.-hole intervals were drilled from just below the 13-⅜in. surface casing to the 9⅝-in.-casing point, building from 25° inclination to horizontal and holding thereafter. This program (the first applications of this type in Australia) resulted in two consecutive world-record runs. The result is that CWD is a viable enabling technology that will be used to drill future Stag infill wells and should be considered as a viable alternative on other drilling projects. This paper will discuss the identification of the technology application, planning, implementation, results, and lessons learned. This paper will end with a notional conversation regarding CWD becoming a mainstream method.

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Casing While Drilling (CwD): A New Approach To Drilling Fiqa Formation in the Sultanate of Oman—A Success Story

Cited by 20 publications

References 10 publications

Computational Modeling of Drilling Fluids Dynamics in Casing Drilling

Computational Modeling of Drilling Fluids Dynamics in Casing Drilling

Review of casing while drilling technology

Casing During Drilling With Rotary-Steerable Technology in the Stag Field—Offshore Australia

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