The broken lines indicate less commonly used hole sizes. Solid lines indicate commonly used bits for that size pipe and can be considered to have adequate clearance to run and cement the casing or liner (i.e., S'/i-in. The llow of the chart indicates hole sizes that may be required to set that size of pipe (i.e., 5-in, liner inside or b'A-in. To use the chart, determine the casing or liner size for the last size of pipe to be run. 6-3 can be used to select the easing and bit sizes required to fulfill many drilling programs. In addition, bit selection is restricted for sizes greater than 12Vi in. Table 6-3 illustrates size availability for Hughes insert tooth bits. Tion and availability become more difficult in odd or small bit sizes (less than 6.5 in.}. Table 6-3 Size Availability for Various Hughes Insert Tooth, Journal Bearing Bits sup>:SFJ iHydiil)"IJ-4S (NL Atlas Bradford).'long thread and coupling (same diameter as STC or BTC) Table 6-2 Clearances for API and Various Premium Proprietary Couplings However, nonstandard bits or unusual sizes may not possess all of the desirable features, such as center jet or gauge protection characteristic^ In addition, bit selec. Bits are available in almost any desired size range. Sizing the bit program is dependent on the required casing sizes. 6- lb, the hole geometry would not be difficult to achieve if premium couplings were used, whereas clearances might be unacceptable if API couplings were used.īit Size Selection. In many cases, more expensive premium couplings can clearly reduce the total well cost by allowing smaller pipe and hole geometries. as such, will occasionally allow the use of smaller pipe in a well. These couplings usually have clearances less than comparable API connections and. Significant advantages are often provided by using premium couplings. larger than the pipe in sizes greater than 75/s in. Table 6-2 shows the outer diameter of various types of couplings and pipe sizes. However, coupling diameters may be a design guideline in some wells. Pipe couplings are generally designed to satisfy requirements such as burst, collapse, tension, and sealing effectiveness. The fourth option is occasionally required in hydrogen sulfide environments where low-strength metals must be used.Ĭoupling Selection.
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