Downhole Water Sink (DWS) Completion Enchance OIL Recovery in Reservoirs with Water Coning Problem

Wojtanowicz, Andrew K.; Shirman, E.I.; Kurban, H.

doi:10.2118/56721-ms

Cited by 13 publications

(5 citation statements)

References 15 publications

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“…It showed that DWS gave better performance of water coning control and higher oil production rates than conventional wells, which were confirmed by successful field implementations by Hunt Petroleum several other companies Wojtanowicz, 1995a, 1995b;Bowlin et al, 1997;Loginov and Shaw, 1997). Both physical and numerical experiments showed that DWS could improve oil recovery in terms of recovery factor and time in view of total production of liquids (oil and water) from reservoirs (Shirman, 1998;Kurban, 1999;Wojtanowicz, et al, 1999). However, one of the drawbacks of DWS is that, it needs to drain a huge amount of water to the surface when there is no disposal zone in the reservoir.…”

Section: Introductionmentioning

confidence: 73%

Coning Control and Recovery Improvement Using In-situ Water Drainage/Injection in Bottom - Water - Drive Reservoir

Jin¹,

Wojtanowicz²

2010

Proceedings of SPE Improved Oil Recovery Symposium

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Technology that directly controls water coning employs in-situ water drainage using oil wells with downhole water sink (DWS) bottom completions. With DWS, the well's oil productivity dramatically improves as oil can be recovered from a thin pay zone underlain by bottom water -an impossible undertaking for conventional wells. However, concurrent drainage of large volumes of water depresses water drive -particularly in the reservoir systems with small aquifers. A natural extension of the water sink technology for small aquifers is the concept of returning the drained water to the same aquifer using triple-completed wells with downhole water loop (DWL). DWL technology retains all benefits of water coning control without depleting energy of water drive. However, DWL well completions have to be properly spaced to avoid pressure interference and the drained water must be oil-free to be injected in-situ into the same well. The reported simulation study compares recovery performance of conventional, DWS and DWL wells in variety of oil reservoirs with bottom water coning from aquifers of different size and strength. The results show increasing superiority of DWL over conventional and DWS wells in reservoirs with decreasing aquifer strength. For example, when the aquifer is big, the DWL well recovery is similar to that for conventional and DWS wells but is 5-fold slower than that for DWS. However, when the aquifer is small, DWL recovers 60 percent more oil with 43 percent less water in 10 percent shorter time comparing to conventional well, while DWS fails to perform at all due to the fast depletion of reservoir pressure. Also, the simulation experiments demonstrate operational flexibility of DWS and DWL wells. For conventional wells, a small improvement in recovery requires reduced production rate and extended producing time. In contrast, the recovery process of DWS and DWL wells can be optimized for maximum recovery, minimum production time or minimum produced water by seeking the best combination of the oil production and water drainage/injection rates.

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Section: Introductionmentioning

confidence: 73%

Coning Control and Recovery Improvement Using In-situ Water Drainage/Injection in Bottom - Water - Drive Reservoir

Jin¹,

Wojtanowicz²

2010

Proceedings of SPE Improved Oil Recovery Symposium

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“…6 While theoretically the total water cut (the sum from both the top and bottom completions) could also be reduced, in actuality this is hard to attain due to the limiting ability to perfectly design and "tweak" a DWS completion system unique to an individual well and/or reservoir. 7 If more oil is produced quicker (higher flow rates with increased recovery of the initial oil in place (IOIP)) sufficient enough to surpass the normal expenditures, plus the added expenditures required for a DWS system, the project has an increased economic benefit.…”

Section: Geologic Analysis Overviewmentioning

confidence: 99%

“…The size of the reservoir and the remaining reserves must also be considered. Wojtanowicz et al proposed six (6) basic structures and systems that should be considered for the applicability of a DWS system. 9 The structures are as follows:…”

Section: Geologic Analysis Overviewmentioning

confidence: 99%

Candidate Acquisition of Downhole Water Sink Potential (CadWasp) -Initial Development of an Expert System for Identifying Candidates for Enhanced Recovery Technologies

Kimbrell¹,

Wojtanowicz²,

Jarred³

2006

Canadian International Petroleum Conference

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This paper overviews research efforts, to date, toward an expert system and well candidate selection program model, named Candidate Acquisition of Downhole Water Sink Potential or CadWasp. The final program will identify bypassed oil reserves that are accessible through re-entering inactive and orphaned wells with Downhole Water Sink (DWS) installations and prioritize these reserves according to their success potential. DWS uses two completions, one for the water column and one for the oil column to control water coning. The use of DWS technology is the primary target for this system, but the system is built to enable other types of well stimulations/enhancements to be able to target candidates as well.CadWasp has been designed to identify "most likely to succeed" candidates, not all candidates by searching a massive database from large operational area containing incomplete data. It is presently coupled with the Louisiana Department of Natural Resources Strategic Online Natural Resources Information System (SONRIS) that provided sufficient information for the initial prioritization of candidates by regions, parishes, fields, reservoirs and wells.CadWasp is written in Java in order to allow its running on a wide number of platforms. To avoid problems with installing and configuring a database management system (DBMS) such as Microsoft Access or mySQL, data is stored locally on the user's hard disk in specially formatted files for use in CadWasp.

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“…Downhole Water Sink (DWS) is a technique for producing water-free hydrocarbons from reservoirs with bottomwater drives and strong tendencies toward water coning (9)(10)(11)(12)(13)(14)(15) . Conventional wells in these reservoirs produce increasing volumes of brine with decreasing amounts of oil or gas ( Figure 2) which ultimately leads to early shut-down of these wells without sufficient recovery of hydrocarbons in place.…”

Section: Principles Of Dwsmentioning

confidence: 99%

Dual Gas Lift in Wells With Downhole Water Sink Completions

Marcano

Wojtanowicz

2005

Journal of Canadian Petroleum Technology

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Gas lift is a flexible method. It is possible to use it in wells of 0.159 m 3 (a few barrels) per day, or wells of 159 m 3 (a thousand barrels) per day. There are several methods of producing hydrocarbons using gas lift, but continuous gas lift is most common. Presently, there are at least 1,500 wells in Venezuela producing by intermittent gas lift. Also, single well completions are the most used gas lift installations around the world.For any type of gas lift method, there is a maximum production rate, which is a function of depth, reservoir, completion, and surface conditions. This maximum production requires a specific optimized rate of gas injection. Any additional gas injection rate would result in an oil production rate smaller than the maximum rate.To optimize gas lift for a given well, which includes the selection of tubing strings, size limitations, and maximum available gas flow rate, it is necessary to find the best depth of injection point and the gas injection pressure.

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Downhole Water Sink (DWS) Completion Enchance OIL Recovery in Reservoirs with Water Coning Problem

Abstract: This paper was prepared for presentation at the 1999 SPE Annual Technical Conference and Exhibition held in Houston, Texas, 3–6 October 1999.

Cited by 13 publications

References 15 publications

Coning Control and Recovery Improvement Using In-situ Water Drainage/Injection in Bottom - Water - Drive Reservoir

Coning Control and Recovery Improvement Using In-situ Water Drainage/Injection in Bottom - Water - Drive Reservoir

Candidate Acquisition of Downhole Water Sink Potential (CadWasp) -Initial Development of an Expert System for Identifying Candidates for Enhanced Recovery Technologies

Dual Gas Lift in Wells With Downhole Water Sink Completions

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