Abstract
This patent application has not been assigned to a company or institution.The following quote was obtained by the news editors from the background informa tion supplied by theinventors: “Land-based drilling rigs may be configured to m ove from location to location to drill multiplewells within a wellsite. It is o ften desirable to move the land-based drilling rig across an already drilled well within the wellsite for which there is a well-head in place. Further, mast pla cement on land-based drillingrigs may have an effect on drilling activity. For example, depending on mast placement on the drillingrig, an existing well head may interfere with the location of land-situated equipment such as, for example,existing well heads and may also interfere with raising and lowering of equipme nt needed for operations.”
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NSTL