. Bulletin . Figure 4.—Combination casing nipple. Figure 5.—Die Figure 6.—Die collar. can not be used successfully on a water string, as they are notwater-tight. A die coupling should be selected that wall not hinderthe passage of tools; if not carefully selected, it may be discoveredafter the parted pipe is coupled together by means of the die nippleor collar that various drilling tools which are flush with the holewill not pass through the die coupling. This often happens with dienipples and collars used in the Mid-Continent field, and is a matter of FISHING WITH DIE COUPLING. 23 se
. Bulletin . Figure 4.—Combination casing nipple. Figure 5.—Die Figure 6.—Die collar. can not be used successfully on a water string, as they are notwater-tight. A die coupling should be selected that wall not hinderthe passage of tools; if not carefully selected, it may be discoveredafter the parted pipe is coupled together by means of the die nippleor collar that various drilling tools which are flush with the holewill not pass through the die coupling. This often happens with dienipples and collars used in the Mid-Continent field, and is a matter of FISHING WITH DIE COUPLING. 23 serious concern if the pipe thus coupled is frozen or in such conditionthat pulling it out is not feasible. It is then necessary to turn alltools, such as underreamers, swages, etc., down to a size that willpermit then free* passage through the die coupling, because theunscrewing of such a coupling at any great depth, without unscrewingcollars above the coupling, is almost impossible. METHOD OF SCREWING ON. The die coupling is placed upon the bottom of a string of pip
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