To meet the demand for energy,operators are turning to development of unconventional resources.It is estimated that there are more than 750 trillion cubic feet of technically recoverable shale gas and 24 billion barrels of technically recoverable shale oil resources in discovered shale plays in the US alone.Tight rock in the longer horizontal shale-oil plays requires both longer lateral wells and multistage fracturing to maximize oil recovery.Coiled tubing(CT)plays an essential role in post-frac cleanup,requiring both safe and efficient equipment. Unconventional shale well construction has taken on a factory construction approach,with more than 20,000 horizontal wells being drilled each year in the US.These long lateral lengths require larger CT units(CTUs)with larger outside diameter(OD)strings,which often increases the number and size of the equipment loads necessary to service the wells. Service providers are being challenged with ways to increase the speed and efficiency of these larger service packages,while maintaining or improving safety performance. This paper discusses how the unique design of a mast unit trailer and associated equipment meets this challenge with its 5 1/8-in.preassembled well control equipment(WCE)stack and its ability to contain a full milling assembly combined with a fluidic oscillator in its riser stack.The system has also been designed to be versatile and enables a variety of WCE sizes and configurations to be mounted on the trailer to help ensure customized solutions to many operational challenges. The system offers substantial improvements in terms of rig-up time compared to a conventional CTU.Field trails have shown the preassembled WCE stack can significantly reduce rigup time by as much as 50%by reducing the number of bolts required to be made up and torqued on site. The paper also explains how the unique design improves operational safety.With the reduced number of bolts required to be made up onsite,hand and finger injuries associated with hammer wrenches and dropped objects can be vastly reduced. When the trolley is raised and latched into position,dangers associated with making up a bottom-hole assembly(BHA) directly under a suspended crane load have been removed.Even if the crane were to fail,the mast and trolley is designed to sustain the entire load of the injector,stripper,riser,and blowout preventer(BOP).
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