Multilaterals, an upcoming technology, offers the potential for substantial improvement in well economics. Integrated efforts of service companies and operators have made this upcoming technology a viable completion technique. The issues like maturing reservoirs, many of the existing wells with uneconomical- to-recover results in place and increasingly expensive offshore structure and drilling operations, are addressed in a very positive way by recent advances in the ML Technology. This technology allows to have same magnitude of reservoir exposure with lesser number of wells on surface platform. Also, there is a potential for reducing water-gas Coning and improved recovery of oil. Overview of multilateral technology, its applications and limitations have been covered in the paper. Being comparatively a new technology, higher costs and risks involved during drilling/ completion/servicing would need to be kept in view while deciding to go in for multilaterals. Modelling of multilaterals may be complex for particular configurations, because of likely interplay between reservoir performance and friction losses and pressure continuity in the well bore. Special simulation packages (coupling fluid flow in the reservoir and laterals) may be required for the purpose. Studies so far undertaken in the industry on this issue have been discussed. Multilateral system offered by various service companies, from existing and new wells, have been discussed, covering issues like isolation between laterals, flow control, re-entry access/interventions, dual string completions. Worldwide experience on economics of multilaterals has also been covered. Reservoir screening criteria provided in the paper may be used as guidelines for selecting reservoirs for possible applications of multilateral technology. Multi-disciplinary approach would be required for effective implementation of this technology. P. 109

The HC field was discovered in 1972 and put on commercial production in 1974. The field’s oil production reached life-time high of 461 tpd (tonnes per day) in June, 2006. However, soon the production started declining, rather rapidly, and average production during 2009-2010 was mere 220 tpd, which necessitated an integrated review of the field, combining geosciences, reservoir engineering and production technology. Study started with organizing abundant and scattered field data, recording of Cased Hole Formation Resistivity (CHFR) / Reservoir Monitoring Tool (RMT) and Cased Hole Compensated Neutron (C/H CNL) logs in key wells, which tagged shifted fluid contacts and modified saturations. Past performance of the sands was studied and reservoir simulation carried out for obtaining suitable perforation policy for sands with GOC and OWC. Shale/coal barriers were identified and their reliability was tested for two reservoir units, which helped in putting the rim of oil between GOC and OWC on production. Based on the integrated study, opportunities were identified and well interventions through work-over jobs were carried out for recompletion, zone transfer and water shut-off. Geology of the main block was redefined integrating seismic and new data gathered from four strategically newly drilled wells. Further, a strategy was firmed up for rational exploitation of all sands in the multi-layered block aiming at maximising recovery and minimizing development and operating cost. Implementation of the study augmented field’s production to a second plateau with increase in production from 220 tpd to 375 tpd.

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Copy'lghl 1996, %ciety of PetroleumEngineers,Inc, llds paperwas prepsred fw presentation at the f998 SPE India Oil and Gas Conferenceand Exhibition heldin New Oelhi.Ma, 17-19 February1998. 7hk psper was selected fcf presentalkm Fy an SPE Prcgram Committee foflowing review of information cc+slsined in an abstract submitted by [he author(s). Cordenk of the paper, as prssenled, have not been rekiewedby the society of Petroleum Engineers and are subject to mrrecficm by the author(s). The material, as presented, dc=ss not necessarily reflect any pnsillon of fhe society of Petroleum Engineers, its officers, of members. Papers presented a! S!% meetings are subject 10 publicationreview by EdiloriaT Committees of the Stiely "N Petroleum Enginee"m. EfeCT67KrepWiEfbn, distribution, or storage of any psrf of this psper for ccmmerctsl purposes withwt Ihe wniten cunaent of the Scwlely of Petroleum Engineers is prohibited. Permission 10 reproduce In prfnl Is restricted to an abstract of not more than 300 words; illustrations msy not be copied. The abstract must contsln conspicuous acknovdedgmenl of Mere and by whom the psper was presented Wrtte Librarian, SPE, PO. Box 833S36, Richardson, 7X 75083-3836, U.S,A,. fsx 01-972-952-9435. AbstractMultilateral, an upcoming technology, offers the potential for substantial improvement in well economics, Integrated efforts of service companies and operators have made this upcoming technology a viable completion technique.The issues like maturing rewrVoir6, ninny of the existing wells with uneconomical-to-recover results in place and increasingly expensive ofTshore structure and drilling operations, are addressed in a very positive way by recent advances in the ML Technology. This technology aIIows to have same magnitude of reservoir exposure whh lesser number of wells on surfacel platform.Also, there is a potential for reducing water-gas coning and improved recovery of oil.Oveiview of multilateral technology, its applications and limitations have been covered in the paper. Being comparatively a new technology, higher costs and risks involved during driIIing/ compIetiorJ servicing would need to be kept in view) while deciding to go in for multilateral.Modelling of multilateral may be compIex for particular conf@rations, because of likeIy interplay between reservoir performance and fiction losses and pressure continuity in the weI1 bore. Special simulation packages (coupling fluid flow in the reservoir and laterals) may be required for the purpose. Studies so far undertaken in ihe industry on this issue have been discussed.MuMlateral system offered by various service companies, from existing and new weIIs, have been discussed, covering issues Iike isolation between laterals, flow control, re-entry access/interventions, dual string completions. experience on economics of multilateral has covered.Worldwide also been 109 .Reservoir screening criteria provided in the paper may be used as guidelines for selecting reservoirs for possl%le applications of multilateral technology.Multi-disciplinary a...