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Nusantara
This article, written by Assistant Technology Editor Karen Bybee, contains highlights of paper SPE 121548, ’Innovative Retrievable Lock Mandrel Extends Monobore Com pletion Potential,’ by Francois G. Millet, SPE, and Pierre-Arnaud Foucher, Geoservices Equipements; Paul Helderle, E.W.E.; Dedi K. Djunaedi, SPE, Vico Indonesia; and Pierre Petel, SPE, PT Welltekindoo Nusantara, originally prepared for the 2009 SPE/ICoTA Coiled Tubing and Well Intervention Conference and Exhibition, The Woodlands, Texas, 31 March-1 April. Monobore completions are an efficient way to exploit multilayer reservoirs. During the life of a field, targeted layers can be opened or closed to optimize hydrocarbon production and avoid undesirable fluid entry. For these cases, nippleless retrievable bridge plugs often are required to isolate a specific reservoir. However, tools currently available fail as a result of their traditional rubber sealing element. To solve these problems, a tool has been developed that is based on a segmented sealing ring that expands by the mechanical displacement of blocks. Introduction Since 1990, tiny pay zones have been produced cost effectively by commingling through cemented liners or tubing perforated “on demand” to optimize hydrocarbon production. Progressively, the conventional landing nipple has been eliminated from completion architecture as the number of producing layers has increased to as many as 70. This evolution also has been motivated by the need for first-class reliable liner cementations with optimal wiper-plug efficiency. This architecture also permits more-reliable exploitation of multizone wells (including high-temperature reservoirs) by avoiding wire tracking of landing-nipple sealbores and rubber-seal-based completion packers. Sealing-Element Limitations Many trials of adapting conventional completion packers have been performed, with irregular results. Operators know that all available lock mandrels often fail because of their massive rubber sealing-ring element(s) that. Swell under the effect of temperature and gas, and only sometimes set. Must be highly stressed to seal against the walls of the borehole and the lock-mandrel ring, while having a low expansion ratio to prevent the gasket from suffering from creep. Swells and hardens to become irreversibly deformed, which prevents it from being retrieved easily. Both downhole conditions and duration are therefore conditioning the irreversible deformation of the rubber and consequently the retrievability of the current designs. Relative axial displacements of the anchoring slips and the sealing ring also make the mandrel difficult to unset. Different attempts have been made to solve these identified problems, but they were not able to correct them all at the same time with a simple versatile tool that fulfils the various needs of drilling, production, and well servicing. Kinematic-Seal Concept To surmount these limitations, the unidirectional blowout-preventer seal-ram proven concept has been extrapolated in two dimensions by dividing the traditional rubber packoff ring into an assembly of paired tapered blocks.
architecture, Coiled tubing operations, completion equipment, Completion Installation and Operations, completion selection, configuration, differential pressure, expandable seal, light slickline unit, lock mandrel extend monobore-completion potential, multilayer reservoir, perforation, radially, reservoir, retrievable lock mandrel extend monobore-completion, Upstream Oil & Gas, well integrity, zonal isolation
Country:
- North America > United States > Texas > Montgomery County > The Woodlands (0.25)
- Asia > Indonesia > East Kalimantan > Nusantara (0.25)
Oilfield Places: Asia > Indonesia > East Kalimantan > Kutei Basin > Sanga Sanga PSC > Badak Field (0.99)
SPE Disciplines:
- Well Completion > Well Integrity > Zonal isolation (0.91)
- Well Completion > Completion Selection and Design > Completion equipment (0.90)
- Well Completion > Completion Installation and Operations > Coiled tubing operations (0.70)
- Well Completion > Completion Selection and Design > Completion selection (0.62)
Abstract An operator developing a geothermal field to generate and provide electricity in Indonesia focused on minimizing the potential for failure of planned wells throughout the expected field life. One of the main areas where this effort was directed was in the design and execution of primary cementing jobs during well construction. Wells drilled and completed earlier, in Phase I, were found to suffer from various wellbore integrity issues. Inspection log data and cement job records from existing wells suggest the zonal isolation problems experienced on earlier wells may have been related to (1) structural failure of the conventional cement sheaths used and/or (2) ineffective cement slurry placement caused by poor hole cleaning of the drilling fluid and/or (3) ineffective removal of drill cuttings from the well during the hole cleaning. Structural damage to the cement sheath can sometimes be in the form of debonding at the casing, formation interfaces, cement sheath cracking, and/or compressive shear. The damage can be caused by stresses on the cement sheath brought on by well events such as cement hydration, well completion, and steam production. These events change the temperature and pressure under which the cement slurry is placed and cured. If these changes are severe, the cement sheath may be damaged, leading to zonal isolation failure. After detailed analysis, and by using an integrated design approach to effectively address the challenges identified, it was decided to use innovative elastic cement systems incorporating various mechanical property enhancement additives expected to withstand the predicted well operations with less possibility of failure than conventional cements. These advanced cement systems were placed in the planned development using conventional cementing equipment. Industry-recognized best practices were also used to maximize mud displacement and enhance hole cleaning. These wells were steamed, and no wellbore integrity issues have been reported. Additional benefits observed while using the advanced cement systems in these applications include a reduction in lost circulation and significantly reduced wellhead growth. The Wayang Windu Power Project Located 40 km south of Bandung, in West Java, the Wayang Windu power-generation project is operated by Magma Nusantara Limited (MNL), a wholly owned subsidiary of Star Energy. It is managed under a joint operation contract (JOC) with Pertamina to develop geothermal resources within the 12,960 hectare contract area (Fig. 1). An energy sales agreement between MNL, Pertamina, and PLN (a state-owned utility company) gives Star Energy the exclusive right to develop up to 400 MW of electricity-generating capacity over a period of 42 years—with each generating unit being scheduled to operate for at least 30 years. The JOC has the potential to ultimately deliver more than 650 MW of base-load electricity. Phase I of the Wayang Windu has been producing power since June of 2000. The Phase I power plant has the biggest single geothermal turbine in the world, and is currently delivering 110 MW of electricity into the Indonesian national grid. Geothermal fluids are gathered from three wellpads where 10 production wells are located. This geothermal fluid is transported to a centralized separator station. From there, the separated steam is delivered to the power station by two main steam pipelines (approximately 0.5 km) through two scrubbers located at the station boundary. Brine plus any excess condensate is then reinserted into the ground. At this time, development of Phase II (a second 110 MW unit) is well underway. Drilling of Phase II wells was completed in 2007 (Fig. 2) and the Phase II power plant is expected to be operational by early 2009. Potential for significant field expansion was observed during the development drilling for Phase II with some wells testing at more than 40 MWe.
advanced cement system, anomaly, application, best practice, casing and cementing, cement chemistry, cement formulation, cement property, cement sheath, cement slurry, gal ac 14, geothermal well reliability, operation, Petroleum Engineer, Phase II well, power plant, spe 115638, Upstream Oil & Gas, Wellhead Growth
SPE Disciplines:
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