The biggest size of completion equipment is 5 inch.Īccording to the Table 1, the bit and casing plan for this well is described below.Completion equipment – TRSV, Side Pocket Mandrel, Packer, etc.The Rig needs to drill and set the conductor casing to 500’ TVD in order to rig up the well control equipment. The casing string should be set at 3000’ TVD, 6,000’ TVD and 12,000’ TVD. Table 1– Commonly Used Bit Sizes That Will Pass Through API CasingĮxample:According to the previous example, this is the casing design based on pore pressure and fracture gradient (Figure 1).įigure 1– Casing Design Based On Pore Pressure and Fracture Gradient This is based on API casing therefore if you use special casing, you may need to check with the casing company to give you exact casing ID. You may need to use the following table (Table 1) to determine bit size and casing size. Once you get the last casing string, the upper string is selected by repeating bit selection and casing selection similar to step #3 and #4. Casing size must be smaller than bit size and its ID must be bigger than the biggest component in completion string.ĥ. Bit size for drilling the production section.Ĥ. This will directly impact of production casing.ģ. Completion equipment is planned to install with tubing string. Proper sizing of tubing is determined by inflow performance analysis.Ģ. The sequence of design is based on the following steps ġ. We’ve learnt several topics in regard to casing design and this article will demonstrate you how to determine casing size in the well.Ĭasing size selection is determined from the inside outward and it starts from the bottom hole.
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