Thin-walled liner equipment cuts costs on well deepening project
- Shell Canada Ltd., Calgary, Alberta (Canada)
- Baker Oil Tools, Houston, TX (United States)
- Import Tool Corp. Ltd., Calgary, Alberta (Canada)
Thin-walled, slim hole liner equipment can save $3--4 million per well in deep reentry applications by allowing existing wells to be deepened or sidetracked rather than drilling new wells from surface. The design makes it possible to reenter existing wells, successfully isolate depleted zones, and deepen the well into virgin-pressured reservoirs. The design includes thin-walled, close-tolerance liner hangers, liner top packers, tieback seal assemblies, and liner setting sleeves that provide reasonable burst and collapse resistance while maintaining an inside diameter to facilitate drilling a deep, deviated 4 3/4 in. hole with a tapered 2 7/8 in. x 3 1/2 in. drillstring. In Shell Canada`s Waterton field, gas-producing wells originally drilled in the 1950s, 1960s, and 1970s to depths of 14,760 ft were completed with perforations in 7 in. casing and open hole. These wells are now being reentered to tap new reserves. The reentries encounter particularly challenging sour gas, low temperature, diverse formation pressure conditions. The objective of the reentry program is to seal off the depleted bottom zones of the wells and tap into the same fault-repeated formations ar virgin pressure, at a deeper level.
- OSTI ID:
- 287417
- Journal Information:
- Oil and Gas Journal, Vol. 94, Issue 35; Other Information: PBD: 26 Aug 1996
- Country of Publication:
- United States
- Language:
- English
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