US1505690A - Well-casing shoe - Google Patents

Description

L. F. BAASH WELL CASING SHOE Filed April 18, 1922 gg gg wvewior A Patented Aug. 19, 1924 STATES.

LAWRENCE F. BAASE, .O'F WHIT TIER, CALIFORNIA.

WELL-CASING SHOE.

Application filed April 18,1922. Serial R o. 554,727.

T 0 all whom it may concern:

Be it known that I, LAWRENCE F. BAASH, a citizen of the United States, residing at Whittier, in the county of Los Angeles and State of California, have invented new and and the foot end of the casing is provided with a so-called shoe for they protection of the lower end of the casing, and this shoe is ordinarily made of high grade steel to withstand the wear and it is generally machined throughout its length on the inside and on the outside. This, obviously, is expensive both in the cost of material of which the shoe is formed, and in the cost of machinmg.

Another object of the present invention is to provide a casing shoe while, of substantially integral construction, is at the same time made up of two rigidly united sections, one of which only is specially machined, while the other may be made of stock tubing of suitable inside and outside diameters. I

An embodiment of the invention is described in the following specification and in which Fig. l is a central longitudinal section of fore joining.

Fig. 2 is a central longitudinal section of the two pieces united. 1 I

Ordinarily, a casing shoe consists of one integral piece of high grade material, the outer surface of which is cylindrical and of uniform diameter from end to end and is turned true. The upper portion of the shoe is bored to produce a cylindrical interior bore just below which is provided a tapered threaded zone to be screwed on to the casing end and below this threaded portion the shoe is further bored but the diameter of the bore is considerably less than the upper end in which the casing fits, in order to secure a substantial leading end for the shoe.

By my invention I construct a shoe of which the upper end 2 is of stock tubular the upper and lower pieces of the shoe be-- material and which may, if necessary, be

turned to the desired internal and outside diameters and this section is beveled oii at 2' on one end. i

- The lower section of the shoe is made of material of a higher degree of hardness and better quality than the upper section 2 and as shown, consists of a thick body part 3 oi tubular form, the. lowermost end of which is beveled to form an enteringedge 4. The upper end of the shoe section 3is internally threaded as at 5 to receive the casing end and it is also beveled off as at 6 to coincide withthe beveled edge 2 of the upper section, the sharp edges of the beveled portions registering and forming, when set in abutment, a V shaped groove which is to be filled with a brazing or welding material indicated at 8 Fig. 2.

1 From the above it will-be seen that I am enabled to utilize a lower grade stock material for the top section 2 and to utilize a high grade entering section 3,thelatter only of' which requires internal machining to form its bore ands-to produce the threads.

These sections are adapted to be rigidly,

joinedas, preferably, by welding as is indicated by thewelded joint 8.

Various 'modifications and changes may be resorted to within the spirit of the invenw 'tion as claimed. illustrated in the accompanying drawings,

What is claimed is l. A well casing shoe comprising a cylindrical upper section having a cylindrical bore and a beveled edge on one end, and a lower shoe section of higher grade material and which is internally machined and having itsupper end beveled; the beveled ends of the seotionsbeing abutted and a welded joint connecting the sections. f

2. A well casmgshoe construction com prising a lower shoe section of thick high grade material internally machined and having a casing thread in its upper end and I an outwardly and downwardly bevel end -face above the thread, and a cylindrical upper section of common thin material having a bevel lower end to match the bevel upper end of the first section, the two sections 7 being welded together at their bevel ends.

In testimony whereof I have signed my,

name to this specification.

L. F. BAASH.

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