US1896250A

US1896250A - Lubricator coupling

Info

Publication number: US1896250A
Application number: US313392A
Authority: US
Inventors: Floyd L Scott
Original assignee: Hughes Tool Co
Current assignee: Hughes Tool Co
Priority date: 1928-10-19
Filing date: 1928-10-19
Publication date: 1933-02-07
Anticipated expiration: 1950-02-07

Description

Feb, 7, 1933. F. L SCOTT 1,896,250

` LUBRIGATOR COUPLING Filed oct. 19, 1928 BY @Mm A TTOIeA/.Ey

Patented Feb. 7, 1933 UNITED STATES PATENT OFFICE FLOYD L. SCOTT, OF HOUSTON, TEXAS, ASSIGNOR TO HUGHES TOOL COMPANY, F HOUSTONLTEXAS, A CORPORATION OF TEXAS LUBRICATOR COUPLING- Application led Octoberv 19, 1928.

My invention relates to couplings such as are employed in attaching a lubricator barrel to the head of a drill bit, adapted for use in deep well drilling. It is particularly designed for use with drills having a removable water course longitudinally of the head of the drill. In well drilling it is necessary to provide a passage for flushing fluid downwardly through the drill-stem, and drill so that the cuttings from the drill may be washed away from the drill and be carried upwardly outside the drill stem to the surface. Powerful pumps are now employed for forcing the flushing fluid into the well for this purpose and as the flushing fluid contains mud and abrasive materials, it is found that the passages for the fluid through the head of the drill are Subj ect to rapid wear. A removable 2C and replaceable watercourse mayv therefore, be placed longitudinally .of the head of the drill, so that when wear occurs, the watercourse may be removed and replaced by another' one without the loss of the drill head. This removable watercourse is shown in the patent Yto H. lV. Fletcher, No. 1,482,787, granted February 5th, 1924. But, the removable water tube in the prior patent is threaded and screwed directly into the coupling member, the channels in the coupling being inclined downwardly to converge at the upper end of the tube and the threaded seat in which is secured. This structure has the obj ection that the flushing fluid is given a turbulence by the converging channels in the coupling, at the upper end of the tube and its seat, so that rapid wear occurs at the upper end of the tube. The material in the coupling to which the tube is secured, wears away rap- 0 idly so that the tube becomes loosened and develops leaks and the coupling or cage 4must be replaced nearly as Voften as the tube.

' It is an object of my invention to so secure the flushing tube to the cage that the attaching connection will be protected from wear.

It is also desired to form the passage for the flushing fluid in the cage so that the flow may be open and the passage large toavoid wear at the upper end of the tube, and par- Serial No. 313,392.

ticularly at the tube to the cage.

In the drawing, Fig. l isa central longitudinal section through a well drill, showing my invention employed thereon.

Fig. 2 is an enlarged detailed sectional view of the lubricator cage with the tube therein.

point of attachment of the Fig. 1 shows a common type of Well drill, i

having a head 1- with cutters 2 rotatable on the lower end thereof. The upper end of the head 1 has a threaded shank 3 for attachment 11 and 12 to direct the lubricant to the cutter bearings.

The cage alsoserves to direct the fluid from the interior of the drill stem, to the removable watercourse 13 in the head. Said 'watercoursev isa tube of steel or other metal connected with the coupling or cage at its upper end and extending axially of the drill head to discharge water and flushing fluid to the lower end of the hole. The upper end of the tubes has a head 14 thereon which is secured by welding or .otherwise rigidly to the tube. This head `llis threaded on its exterior to engage within the threaded recess 7 in thel cageabove the nipple 8 of the drill head.

The tube extends through the head 14 thereon to project through the upper end yof the recess 7 into adiametrical passage 15 in the cage. The upper end of the tube forms a tightfit with the cage above the recess 7 and its end is flush with. the lower wall of the passage 15, which, as seen from Fig. 2, has a flat lower side. I make the passage 15 comparatively large so that as free a low as possible may be obtained for the flushinguid. I

It will be obvious that the threadedseat 7 and the shoulder 16 at the up r end of the head 14 of the tube make a uid seal that cannot be easily worn. The lushin fluid entering the passage 15 will pass direct y into 5 the upper end o the tube and such wear as occurs due to turbulence of the mud-laden liquid will take place at the extreme upper end of the tube, and in the passage I5 away from the threaded connection of the head 14. It will, therefore, take wear for a ma terially long period of time before the threaded connection between the tube andthe cage will become materially worn so as to allow leakage or to loosen the tube. It is this attachment of the tube to the cage that forms the main object of the invention, and I have found that with this arrangement,`the life of the cage is greatly increased.

'What I claim as new is:

1. In a rotary drill bit, a drill head, a lubricator barrel, a tube for ushing liquid axially of said head, a coupling member connecting said lubricatordbarrel to said head, said coupling having a threaded recess in its lower end to engage said head, and a head on said tube shaped to fit said recess above said drill head, an extending upper end on said tube projecting above the head thereon, said copp ing having a diametrical assage 80 arrang at a right angle to the tu axis and communicating -with the upper end of said tube.

v 2. In arotary drill bit, a drill head, a lubricator barrel above said head, a removable 85 flushing tube axially of said head, a coupling member connecting said' lubricator barrel to said head, said coupling having a threaded g recess in its lower end to engage said drill head, a diametrical fluidpassage through A 40 Vsaid coupling, said tube extending through said recess to connect with said passage, said passage having a flattened lower surface flush with the upper end of said tube, and means in said recess to" engage said tube.

3. In combination, a lubrcator cage for rotary well drills, said cage having a threadednipple at its upper end for attachment to the lubricator barrel, and a threaded recess in its lower end for attachment to the drill head, said cage'having a diametrical passage above said recess, a tube extending througli said recess and into said passage, and a ead on said tube removably engaging said recess at a point spaced below said pas-v n testimony whereof I hereunto ailix my signature this 9th day of October A. D. 1928.

' FLOYD L. SCOTT.