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| | | A solution that matches your requirements Low transport costs and fast rig moves Two of the most important features of the LOC400 rig are its compact size and the fact that the entire rig can be broken down into 22 modules with the shape and the dimensions of standard ISO containers. Within 24 hours (including limited transportation time) and without cranes, a five-man crew with three trucks can demobilize the compact rig and rebuild it in another LOCation. As standard container ships, trains and oilfield trucks can transport ISO containers rapidly and economically, the LOC400 rig can be used to drill wells anywhere in the world. | | |
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| | | Deployment in land, offshore-platform or well-pad configuration Its modular design enables the LOC400 rig to be utilized in various ways: on land, on skids for jungle use, on offshore platforms or on barges for drilling in lakes or swamps. On offshore platforms, the modules of the LOC400 can be fitted compactly on to a skid unit using a crane, which enables two-dimensional movement of the complete rig over the platform's array of wells. | | |
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| | | Casing while drilling In CWD, a well is drilled using standard oilfield casing instead of drillpipe. This enables the operator to simultaneously drill and case a well. Drill bits and other tools can be lowered inside the casing to the bottom of the hole on a wireline, where they are latched to the last joint of casing, while mud circulation continues. Retrieval of the bits and the tools occurs the same way. The CWD process eliminates tripping and its associated blowout risks. There are several possible configurations for CWD systems: the casing rotates during drilling but there are various rotation-speed options, and the drilling tools may be integrated into the casing string or be part of an assembly that extends below the casing shoe. A top-drive system is used to rotate the casing, which remains in the hole at all times and is eventually cemented in place when the casing point is reached. The benefits of CWD include reduced drilling flat time (no tripping); the casing is always on bottom, which eliminates the risks associated with open holes; improved circulation; drilling through difficult layers such as depleted zones and unstable formations is made easier; and improved wellbore stability, which often means that a casing string can be eliminated. It has been proven in many wells that drilling efficiency can be improved by 20 to 50% with CWD. Since the casing remains in the well and circulation is maintained at all times, wellbore integrity is preserved and unscheduled events such as well control problems, swelling or sloughing formations, and washouts are avoided. For the CWD technology, Tesco was committed in the development of the LOC250 / 400. | | |
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