Drilling Operations in Peruvian Jungle requires a complex logistical preparation similar to an offshore project. This high logistic cost that is necessary to drill in this area means a big investment and strongly impacts the daily drilling cost. To minimize potential non productive time (NPT), potential problems that were identified in offset wells (borehole instability, gumbo shales, stuck pipe, etc.), and to improve the drilling performance, Perenco Peru Limited decided to use Directional Casing while Drilling (DCwD) technology in their Block 67 campaign wells. Two wells (Piraña-4D and Dorado-2D) were drilled with this technology obtaining success and achieving the operator's targets. The objectives for the Casing Drilling operations on the Block 67 wells were: Prove feasibility of both vertical and directional casing drilling technologies Save time upon the whole section by simultaneously Drilling and casing-off problematic formations Demonstrate efficiency of the technology to reduce risks associated with conventional drilling that could easily result in losing the well and further unplanned sidetracks Prove adaptability of the technology to different well conditions (mainly variance on well trajectory) Evaluate the economical viability of the technique (cost & time savings) This paper describes these experiences in terms of planning, preparation, execution and evaluation of results including the lessons learnt generated during the process.
Originally discovered in 1993, the Stag Oil Field, located on the Northwest Shelf of Western Australia, has produced over 58 MMbbls since production began in 19987. The Field is a shallow (680m SS), highly unconsolidated, highly permeable sandstone. Reservoir depletion, unconsolidated rock, water breakthrough and sand production have created conditions where infill drilling campaigns have become increasingly problematic in the Stag field in recent years. Numerous papers have documented the history of the Stag Field's colorful past12-13, 23. On three recent infill wells the intermediate 12 ¼?? intervals were drilled and cased using Casing while Drilling (CwD) technology using a rotary steerable system. This was used to navigate wellbore congestion, drill designer wellpaths to avoid "incoherencies?? (a seismic attribute that is mappable and correlates with drilling problems5), land the horizontal section and then 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 a key enabling technology to drill a well that might otherwise be undrillable due to instability issues. The directional CwD 12 ¼?? hole intervals were drilled from just below the 13 3/8?? surface casing to the 9 5/8?? casing point, building from 25 degrees 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 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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.