TX 75083-3836 U.S.A., fax 1.972.952.9435. AbstractCurrent trends in the oil and gas industry are focused more in operational efficiency, production optimization, value, and environmental effects than ever before. The industry actively pursues technologies and techniques that offer improvement in these areas, which explains the increased interest in multilateral well designs. In highly sensitive areas, such as national parks and areas of geographical sensitivity, it has become extremely difficult to obtain permits to prepare well sites if this preparation requires the removal of forestry, permanent scarring of the landscape, or disturbances to the wildlife or to the people who live and work in the area.The Val d'Agri field in southern Italy is located within the boundaries of the Basilicata National Park. Consequently, Eni and its partners were challenged with reaching production targets while minimizing land disturbances. Eni evaluated and implemented multilateral technology to help meet the objectives.The forward thinking of Eni led the company to pre-install orientation devices in the casing string during the original construction of the well. This action made it possibile to perform multilateral solutions if/when needed, such as the TAML Level 5 implemented on well Agri-1 or B.The first orientation devices to be used were installed in well Cerro Falcone 3X or A in 2000 to construct a TAML Level 2 junction with re-entry capabilities through the completion. In 2003, the same technology was used on Agri-1 or A, where the orientation devices were installed in the 7-in. and 9-5/8-in. casings. When well Agri-1 or A was put on production, the produced fluid was found to be much more corrosive than expected. The well had to be shut in because the metallurgy of the equipment in the well was not suitable for the corrosivity of the produced fluid.Eni and Halliburton formed a team to evaluate the situation and design a suitable solution: to exit from the 9 5/8-in. orientation device and drill a secondary lateral. This secondary lateral required a TAML Level 5 junction with an Incoloy 925 completion to isolate the junction and to provide throughtubing access to all bores, including the existing Agri-1 or A.This paper focuses on the methodology and value this technology brought in the achievement of planned production targets.

This paper describes the application of openhole Multi-Stage Fracturing completions with swelling packers and sliding sleeves in the carbonate formation of the Karachaganak field, Kazakhstan. It focuses on the benefit brought to the field by the new completion concept. It also explains the methodology and strategies adopted for executing fracturing stimulation within the limited capacity of material supply and logistic challenges in a harsh environment and remote location. The completion strategy in the Karachaganak field has been evolving from simple vertical (cased hole / openhole) completions, to selective and non-selective multilateral wells, and most recently to extended horizontal wells. Acid stimulation, both matrix and fracturing, are the common method to improve well productivity in this highly heterogeneous formation. Multi-stage acid fracturing was identified as a potential technique to achieve the objective of unlocking production from extended horizontal openhole section in the low permeability regions of the field. The new completion technology combines the use of swelling packers and ball activated stimulation sliding sleeves (with a mechanical shift option) to achieve intervention-free multi-stage fracturing in the openhole. The swelling packer and stimulation sliding sleeve provide a reliable isolation and fracturing point respectively for a selected fracturing zone. Post-stimulation inflow profile indicated contribution from almost all the treated zones as a result of diversion effectiveness. The first application of this technology in one of the Karachaganak wells resulted in a significant initial production and the well was recorded as one of the best Object 3 oil producers in the field. Ten (10) subsequent completions were deployed after the first installation. The stimulations performed to date have shown that Swelling Packers are reliable for zonal isolation and allow a good coverage of the entire horizontal section.

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractCurrent trends in the oil and gas industry are focusing more heavily on operational efficiency and cost reduction than ever before. Therefore, operators and service companies are investigating any technique that offers possibility for improvement in these areas, and this explains the recently renewed interest in the monobore and slimhole concepts.The most obvious savings are those that relate to:• the size of the rig required to drill the hole • the amount of well control material used during the drilling of the hole • the quantity of cement required to cement the casing string in place • the size and quantity of tubing and casing required to complete the well • the discharge of drill cuttings would be dramatically reduced. This paper will review a new equipment design that is ideally suited for use with coiled tubing to perform a cement job in slimhole wells.This innovative technique is performed with 2-in. coiled tubing. A special device, which is made up with an educated J-slot and a 2.55-in. seal at the end of the coiled tubing, will engage and disengage automatically from a seal bore receptacle that is placed at the end of the 3-½-in. casing string.This tool is retrieved, easily redressed and re-used. It can be sheared so that the coiled tubing can be pulled in the event a catastrophic event occurs during the cement job.This tool reduces the contamination of cement. In addition, it offers an economical method for cementing in scenarios in which a standard cement job cannot be performed. For example, when a control-line-activated landing nipple is used in the casing/tubing string, there is risk of depositing cement in the landing nipple bore and plugging the control line when using traditional cementing techniques.This paper describes the operational procedures, benefits of the system, and a slimhole completion design adopted by ENI-AGIP to take advantage of the benefits of the system.

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