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642 Chapter 6 Drilling Technology and Costs Input Section. The Input Section acts as a reminder of each event within each interval to be accounted. A time and cost for each activity in an interval are entered. For all activities that affect the hours for the rig, the hourly operating rate is charged and tracked in the interval. All direct costs are also entered. For charges that do not affect rig hours, a charge time is developed and multiplied by the number of hours that would be charged for the rental or service. There is a running cost based on the additional equipment that is on the “clock” during drilling operations. Some of these events and equipment also require freight charges, mobilization charges (or initiation cost), and demobilization charges. Each event or equipment selection may also result in a direct cost for materials such as bits or packers or wellheads. With this degree of detail, the model can be altered to account for changes in procedures and for differences in service and equipment performances. The model can also be adapted to develop costs for alternative drilling methods and technologies. The costing process is adaptable and flexible. At the end of these interval steps, there are a series of endofinterval activities that are listed and a cost and time recorded for each activity. That includes circulating and conditioning drilling fluid, logging the well, running casing, cementing the casing, and changing out the wellcontrol equipment to accommodate the new diameter of drilling to occur next. The model is developed for a particular well by accounting for each time and each cost during the drilling of a well. At each step along the way, an account is kept of the amount of time required of the rig, the amount and cost of materials, and the time and cost of services to develop the well to completion. Wellcost Section. The Wellcost Section sums the costs and times into an account for each interval. The amount of time and dollars can be determined from the Wellcost Section for each activity in each interval. It is possible to track the interval costs from beginning to end. At the end of each interval, a sum of the interval cost is available. AFE Section. All of the costs and times are then transferred or summed to an AFE Sheet. The AFE Sheet was chosen as the primary form of output because most available information is recorded in that format. The total well cost, the time, and the cost for each major type of expense is listed in the authorization for expenditures (AFE) spreadsheet.PDF Image | Drilling Technology and Costs
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