Ingénierie et passation de marchés . Hills, Jacksonville, FLA,responsable ingénieur de l'Isham Randolph & Co., Consult-ing Engineers, pour les informations ci-dessus. 61 UNE MÉTHODE AMÉLIORÉE DE PUITS PROFONDS de diamètre DRILLINGLARGE.* Dans les puits de forage de pétrole dans le champ de pétrole de Coalinga dans Califor-nia le problème est d'atteindre une profondeur de 4.000 pi. Ou moreavec une chaîne de tuyau pas moins de 8 ^ po. De diamètre et de maintenir la chaîne libre et mobile. Certains résultats très pros ont récemment été obtenus par une méthode conçue par M. William Kick. Un grand jeu pour le tuyau est obtenu; le circulateur standard sy.St

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Engineering and Contracting . Hills, Jacksonville, Fla., engineer manager of the Isham Randolph & Co., Consult-ing Engineers, for the information given above. 61 AN IMPROVED METHOD OF DEEP DRILLINGLARGE DIAMETER WELLS.* In drilling oil wells in the Coalinga oil field in Califor-nia the problem is to reach a depth of 4, 000 ft. or morewith a string of pipe not less than 8 ^ in. in diameter andmaintain the string free and movable. Some very prom-ising results have recently been obtained by a methoddevised by Mr. William Kick. A large clearance for thepipe is obtained; the standard circulator sy.stem is used;the pipe is kept moving while drilling is in progress; eachcollar is set up twice before it goes below the bottomof the derrick cellar. The large clearance is obtained by the use of a shoe ofextra large diameter, from 1^4 to 1% in. larger than thecollars on the pipe. Under-reaming is resorted to fre-quently and the hole is repeatedly under-reamed until thepipe is entirely free in passing a shell or hard streak.. Swinging Spider for Deep Well Drilling. Spudding the pipe is avoided. When a conductor pipe islanded, the desirable extra clearance for the next stringmay be obtained by skipping one size of pipe, as for in-stance carrying a 10-in. string through a 15V2-in., thuseliminating the 12i2-in. size. This is necessary with thepresent sizes of pipe available, but a different designwould save considerable expense in this matter. This extra clearance is necessary in using the circula-tor system to allow free passage for the returns. Itobviates the danger of sand lodging between the stringsof pipe and freezing the working string. The well-known standard circulator system is used.Mud (clay)-laden fluid is forced down through the pipeunder pressure by pumps (ordinary rotary slush pumps)and returned on the outside of the pipe, carrying the drill-ings with it. This fluid is run through a flume and intoa pit, as in rotary work, and its consistency is regulatedas with the rota

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