US1363987A - Casing-shoe - Google Patents

Description

I. G. LINDSAY.

cAslNG sHoE.

APPLICATION FILED MAY I6. 1918.

Patented Dec. 28,1920.

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JOSEPH G. LINDSAY, OF BARTLESVILLE, OKLAHOMA.

v cAsING-sHoE.

Specification of Letters Patent.

Patented Dec. 28, 1920.

Application filed May 16, 1918. Serial No. 235,003.

T 0 all whom t may concern.'

Be it known that I, JOSEPH G. LiNDsAY, a citizen of the United States, residing at Bartlesville, in the county ofWashington and State of Oklahoma, have invented certain new and useful Improvements in Casing-Shoes; and I dodeclare the following to be a full, clear, andexact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in shoes such as those used on the lower ends of oil well casings and the like to form a tight connection between the casing and the internal ledge formed at the juncture of the two diameters of the well bore. The old form of shoe has been found to be more or less ineiiicient since it provides 11o means to prevent the ledge from crumbling and thus the casing is not only permitted to gradually sink,- but a tightly packed joint cannot be maintained.

The present invention has for its object to overcome the difficulties above pointed out, by the provision of a simple and inexpensive device, and with this object in view, the invention resides in the novel features of construction hereinafter fully described and claimed, the descriptive matter being supplemented by the accompanying drawing forming a part of this application and in which:

Figure l is a vertical section of one form of the invention applied;

ig. 2 is a side elevation of the device shown in Fig. l; y y

Fig. 3 is a duplicate of Fig. 1 but showing a different form of construction; and

Fig. 4 is a side elevation of the form of the device shown in Fig. 3.

In the drawings above briefly described, the numeral 1 designates the bore o f an oil well or the like which is counterbored at 2 to form an internal annular ledge 3 at the juncture of the two well diameters. It is upon this ledge that the shoe 4 of the well casing 5 is supported. l

The shoe 4 consists of a tubular body whose upper portion is of sufficient internal diameter to permit the casing 5 to be passed easily into the same for engagement with the internal screw threads 6, whereby body of the shoe is shown enlarged although this is AIlot altogether necessary, and the lower end of the enlargement is beveled upwardly and inwardly to form an annular external shoulder 8 to rest on the ledge 3, thus supporting the casing and forming a seal between the same and the wall of the well bore.

The known to those skilled in the art, but has been found to be more or less inefficient since there is no provision made to prevent crumbling of the ledge 3, and consequent sinkage of the casing, as well as leakage of the joint. I overcome these diiiiculties however by the addition of a tubular extension 9 on the lower end of the shoe, said extension being preferably formed integrally with the shoe and projecting below the shoulder 8 arrangement so far described is well for snug reception in the smaller diameter A of the well bore as seen in Fig. l. This extensionnot only prevents caving or crumbling of the ledge 3, but forms an additional seal between the shoe and the wall of the well bore, the advantages of which will be obvious to those skilled in theart. It should be noted that by having the extended lower end portion 9 of this shoe of'even diameter throughout its length it may bev inserted into the reduced lower portion l of the well 2 and will have tight engagementr with the walls of the well throughout its entire length thus preventing caving in lof the walls of the well at the ledge 3.

In Figs. 3 and 4, the construction of the shoe 4a scribed, but the shoulder 8a is not as abrupt as the shoulder 8 and tapers downwardly and inwardly to the extension 9a. The operation alid advantages of this type of the device are identical with those of the form above described, with the exception that the shoulder 8a will have more of a packing effect on the earth upon which it rests.

From the foregoing, taken in connection with the accompanying drawing, it will be obvious that although I have provided an extremely simple and inexpensive casing shoe, it will possess marked advantages over the devices now commonly used. Since probably the best results are obtained from the details shown and described, they are preferable, but within the scope of the invention as claimed,numerous minor changes may well be made. to attach the shoe to the casing. At 7, the

I claim: 'A tubular casing shoe having its walls externally thickened at a point intermediate its height to provide a supporting collarfor walls of the reduced lower end portion of a y engaging the annular supporting ledge in well below the supporting ledge when the the lower portion of a well, the lower end Collar is resting upon the ledge. 10 portion of the shoe providing a sleeve of In testimony whereof I have hereunto set even external diameter throughout its my hand,

length and adapted to t in tight engagement throughout its entire lengthwith the JOSEPH Gr. LINDSAY.

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