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Publication numberUS1134930 A
Publication typeGrant
Publication dateApr 6, 1915
Filing dateMar 27, 1914
Priority dateMar 27, 1914
Publication numberUS 1134930 A, US 1134930A, US-A-1134930, US1134930 A, US1134930A
InventorsJames C Theriot
Original AssigneeJames C Theriot
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Well-drilling tool.
US 1134930 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)


3mm/vtm r.. .w nu.. 6 M/ A a, m 1a ,fr 1 T n l| W c w J n wv Ul is held within a collar at the lower end of a` 'citizen 'of theUnited States, vTait, in the county of Kern JAMES c. Timmer, or mnrncnuronnm.

f anion.


Applicant@ fixed Maren 27, 1914. serial no. 327,688.

'T0 all whomz't may concern Be it known that I, JAMES C. THnRro'r, ya

and lState of California, have invented certain new and useful Improvements in Well-Drilling Tools;

and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains' to make and use the same. I, v

This invention relates to well drilling tools, and one of the principal objects of the invention is to provide reliable and e'liicicnt means for recovering the drill bit after it has become detached from the rotary drill casing. In ordinary well drilling, where rotary drills and' drilling bits are used, the drill bit casing made up of a number of sections connected together. lVhcn the bit strikes a hard refractory substance or formation, there is a great torsional strain uponthe casing, and this strain is frequently suilicient to twist the casing and drop the drill bit and collar to the bottom of the well. To recover the bit and broken portion of the casing requires considerable time and is very eX- pensive in practice.

One of the principal objects of this inven tion is to',` provide reliable andeiiicient means for preventing the bit from droppin any great distance in case the drill'v casing s ould be' twisted oil". It has been found in practice thatthe drill casing usually parts at a point within the first three'or four sections of the casing .adjacent to the bit or tool.

The objects and advantages above referred to may be attained'by. means of the construc-I tion illustrated in the accompanying drawing, in which,

Figure 1 is a longitudinal sectional View taken through a safety device made in accordance with this invention, lportions being broken away between thecollars and rings, and Fig'. 2 is a side elevation ot the device, portions being broken away between the co1- lar's and the device being shown on a smaller scale than that shown in Fig. 1.

Referring to the drawing, the. numeralv 1. designates a drill collar which is inteiorly screw threaded at 2 for the? connection of Specification of `Letters Ivatent.

residing at P atentedApr. 6, 1915.

inner safety casing 4. The collar. 1 is also providedwith an interior screw threaded portion 5 at its upper end in whichfis fittedthe rotary casing 6.y The casing 6 is made l up of a series of separate sections connected. Atogether by interiorly screw threaded collars 7, and interposed between the meetingends l of the sections 6 are steel unthreaded rings Y 8, which are substantially rectangular in l cross section, and are fitted to slide upon the inner safety casing 4. The sections 4 of the- Vinner safety casing areconnected together by means of collars9, and these collars are disposed some distance above the vsteel rings 8. Anysuitable number of the sections v6 70 may be connected together and the safety casing sections 4 are extended to conform to the length of the casing 6. A- packing of hemp, rubber, leather or other suitable-may terial 10 surrounds a core 11 which conforms 75 to the side Iof thev inner safety casing 4, said l packing being interposed between the outer ofi by the excessive strain upon the drilling i bit, andthe break occurs Within the area of the three or four jointsat the lower end of i the casing 6, the safety inner casing 4 would slide within the steel rings 8 and would stop when one of the collars 9 came into cntact V9'0 with said rings thus preventingthe l'ss of the tool and permitting the latter to be readily withdrawn from the well for repairs;

Various changes may be made in the de.- tails of construction without, departing from the spirit and'scope of the invention as defined in the claim. l

lil/hat is claimed is l A safety device for the purpose described comprising. an inner casing-and an outer leo casing, steel rings mounted to move uponl the inner casing, a packing between the inner casing and outer casing and means for\ holding the packing in place.

In testimony whereof I affix my signature in presence of two4 witnesses.

, ,i AMES C. THERIOT. Vitnesses'. f

ELI BIGELow, R. "Wiri'rTnMoRn.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2808231 *Jan 26, 1956Oct 1, 1957Clinton O EngstrandDrill pipe section
US3232638 *Nov 26, 1962Feb 1, 1966American Mach & FoundryPrestressed tubes and rods
US3306635 *Jan 12, 1962Feb 28, 1967Phillips Petroleum CoConduit lining
US3884512 *Aug 27, 1973May 20, 1975Mancar TrustDeep-well drilling arrangement
US3928903 *Jan 29, 1975Dec 30, 1975Atlantic Richfield CoMethod of making a double-walled pipe assembly
US5186502 *Dec 11, 1990Feb 16, 1993Fibercast CompanyDouble-containment pipe fittings and system
U.S. Classification285/117, 285/123.3
Cooperative ClassificationE21B17/023