. Oil investigations in 1917 and 1918 . Pig. 31. Diagram to show the saving in casing accomplished by the use of mud fluid. the detrimental effects of unsystematic casing. The chemical and geo-logical aspects of corrosion have been described on a previous page. Itremains now to consider the mechanical phases of the problem. WATER CONTROL, FLAT ROCK POOL 133 THE MUD To be most effective the mud fluid must consist of colloidal material,free from grit, sand, or lime cuttings. Such granular material tends tosettle around the outside of the casing and to bridge or pack over the col-lars, not only i
. Oil investigations in 1917 and 1918 . Pig. 31. Diagram to show the saving in casing accomplished by the use of mud fluid. the detrimental effects of unsystematic casing. The chemical and geo-logical aspects of corrosion have been described on a previous page. Itremains now to consider the mechanical phases of the problem. WATER CONTROL, FLAT ROCK POOL 133 THE MUD To be most effective the mud fluid must consist of colloidal material,free from grit, sand, or lime cuttings. Such granular material tends tosettle around the outside of the casing and to bridge or pack over the col-lars, not only interrupting the continuity of the column of mud fluid, but. Fig. 32. Photograph showing the connection at the topof the well between the discharge of the mudpump and the casing in the circulation outcoming mud fluid has been downthrough the casing, out its bottom, and isreturning to the surface, outside the casing. possibly freezing the casing. If air is excluded from such a mud fluid, itwill remain fluid indefinitely and with comparatively small amount of set-tling. The thicker the original mud fluid is used the less will be the sub-sequent settling. As general rule it is advisable to mix the mud as thickas the pumps will handle it. 134 OIL INVESTIGATIONS METHODS OF MUDDING WELLS Since the mudding procedure is identical whether the purpose isto obviate the necessity of three shut-offs, or to arrest corrosion, thisdiscussion of methods if applicable to either case. There are, in gen-eral, three methods for mudding: 1. Jet the hole full of mud; insert and land the casing. 2. Run casing into the hole and hang the pipe a few feet off t
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