US1539096A

US1539096A - Well-casing protector

Info

Publication number: US1539096A
Application number: US722344A
Authority: US
Inventors: Leroy H Perry
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-06-25
Filing date: 1924-06-25
Publication date: 1925-05-26
Anticipated expiration: 1942-05-26

Description

May 26, 1925.

L. H. PERRY WELL CASING PROTECTOR File@ June 25, 1924 2 Sheets-Sheet 1 INVENTOR,

Eer/gy Eiger/jy, v

- ATTORNEY.

May 26, 1925.

L. H; PERRY WELL CSING' PROTECTOR E 'ilgd June 25.

1924 2 Sheets-Sheet 2 FIQE INVENTOR, Leroy ff Perry, BY j A TTORNE Y.

CII Y Patented May 26, 1925.

LEROY H. PERRY, OF ARDENA, CALIFORNIA.

WELIFCASIN G PROTECTOR.

Application filed June 25, 1924. Serial N0. 722,344;l

To all whom t may concer/: l

Be it known that I, LEROY H. PERRY, a citizen of the United States, residing at Gardena, inthe county of Los Angeles and State of California, have invented a new and useful Well-CasingTrotector, of which a specification is set forth below.

In this specification, and the accompanying drawing, I shall describe and show a preferred form of my invention, and specifically mention certain of its more important objects. I do not limit-myself to the forms disclosed, since various changes and adaptations may be made therein without departing from the essence of my invention as hereinafter claimed; and objects and vailvantages, other than those specifically mentioned, are included within its scope.

My invention-relates to the art of ,deep welldrilling and particularly to means for preventing rotary tool strings from rubbing against the casing walls and thereby causing damage. Itis well kno-wn that the casing, or water string, is -frequently worn through in this manner and that, especially when a hole has been made in the casing far below the, surface of the ground, it is a very expensive matter to repair such damage.

My principal objects in the invention are; first, to provide means at regularly' spaced intervals throughout the length of the revolving tool string for keeping it out o f direct contact with the casing; second, to prevent abrasion of the walls of the casing bythe tool string by interposing at the said intervals an a-ntifriction bearmg or, if pre` ferred, a wearing surface to take the abrasion that the casing would otherwise be subjected to; and, third, to accomplish the above by means of a relatively simple and inexpensive device that is well adapted for its intended purpose.

l\l y objects are attained in the manner illustrated in the accompanying drawings, in whichr Figure 1 is a longitudinal central section of a deep well with a preferred embodiment of my! invention therein, the latter being shown broken and partlyin longitudinal central section;

Figure 2 is a cross section of the above construction, ure 1; l

Figure 3 is a dis-assembled and broken view in elevation of a tool string with my casing protector thereon;

taken on t-he line of'Figto iit the outside sleeve has a flange 12 Figure 4 is a View similar to Figure 1 lndicating the manner 1n whlch a frlction shoe may be added to my device;

Figure 5 is an elevation on a reduced scale. of the working parts shown in Figure 4; A

Figure 6 is a central longitudinal section of a. well with a modified type of my invention therein; and y Figure 7 is a cross section taken on the line 7-7 of Figure 6.

Similar reference numerals refer to similar parts throughout the seve-ral views.

In the drawings the casing of a deep we ll is indicated at 8. Within this casing isa rotary tool string 9, coupled at intervals as by tool joints 10 in the manner common to the art. My protector is applied to the tool string as it is being made up above ground, and ordinarily just above alternate tool joints. l

The invention comprises a sleeve 11 bored of the tool string. This at the bottom, and a taper thread 13 at the top. The top end is also provided with a plurality oflongitudinal kerfs 14 so that it maybe contracted by means of nut 15 to tightly grip the tool string. i

Surrounding the'sleeve and floating between flange 12 and nut. 15, is a collar 16 having anr outside diameter only slightly smaller than the bore of the casing. The inside diameter of the collar isv considerably larger than the body of` sleeve 11. Ordinarilyvboth the collar and the sleeve are hardened. l

In the usually preferred form of my invention, illustrated in Figures 1 to 5 inclusive, I employ a relatively large number of hardened small rolls 17 in the annular space between the sleeve` and the collar. This construction then constitutes a roller bearing serving to keep vthe .rotary toolstring substantially central in the well and preventing the string from abrading the casing.

A friction shoe 18 of rubber or similar material may be tpplied to this typev of casing protector in the manner illustrated in Figures 4 and 5. For this purpose the central portion ofthe outer surface of collar 16 is turned down, leaving a small iiange 19 atl each end. The shoe may be split angularly as show-n at 20 if the material is not suliicientlyresilient to be stretched over flanges 19 when being mounted upon the collar.

In the modified type of my invention,

be subjected to is thus transferred to the Collar and sleeve since, by reason of the difference in diameters, there is much less tendency for the collar to slide against the inner wall of the casingthan there is for the sleeve to slide against the inner wall of the collar. In this construction the sleeve is made harder than the collar so that it is chiefly the latter that wears. The collars are made of relatively inexpensive material and are cheaply renewed when worn out. A friction shoe similar to 18 may be added to the outside of the collar as in this case as well as in the case ofthe type of my invention previously described. Such a shoe will absolutely prevent any abrasion of the well casing and will insure that such wear as occurs will take place on the collar and sleeve. y

The nut 15 is ordinarily designed for use with a spanner wrench, and one or more peripheral holes 21 are provided for that purpose. t

The construction and method of using my invention will be clearly apparent from the foregoing descriptionand need not be further elucidated. I desire however 'to call attention to the simplicity and relative cheapness of the device, and particularly to the great saving in repairs to casings its use will bring about. This feature will be readily appreciated by those familiar with the drilling art.

I claim as my invention:

1. A well casing protector comprising; a flanged sleeve having a longitudinally kerfed taper-threaded end adapted for gripping a tool string; a nut engaging said thread adapted for contracting said end; and a collar surrounding said sleeve between the flange and nut adapted to contact with a well casing when lateral pressure is exerted by the tool string.. v

2. A well casing protector comprising; a flanged sleeve having a longitudinally kerfed taper-threaded end adapted for gripflanged sleeve ping a Itool string; a nut engaging said thread adapted for contracting said end; and a floating collar-surrounding said sleeve between the flange and nutzvdapted to contact with a Well casing to protect it from abrasion when lateral pressure is exerted by the tool string.

3. A Well casing protector comprising; a having a longitudinally kerfed taper-threaded end adapted for gripping a tool string; a nut engaging said thread adapted for contracting said end; and a floating collar surrounding said sleeve between the flange and nut adapted to contact with a well casing to protect it from abrasion when lateral pressure is exerted by the tool string; the periphery of said collar being of yieldable friction material.

4. A well casing protector comprising; a flanged sleeve having a longitudinally kerfed taper-threaded end adapted for gripping a. tool string; a nut engaging said i thread adapted for contracting said end a floating collar surrounding said sleeve between the flange and nut; and rolleis between said sleeve and collar.

5. A well ocasing protector comprising; a flanged sleeve having means for gripping a tool string; a. floating collar surrounding said. sleeve; and rollers between said collar and* said sleeve; said collar being'adapted to contact with a well casing to protect it from abrasion when lateral pressure is eX- i erted by the tool string. y

6. A well casing protector comprising; a flanged sleeve having a longitudinally kerfed taper-threaded end adapted for gripping a. tool string; a nut engaging said thread adapted for contracting said. end; a floating collar surrounding said sleeve between the flange and nut; and hardened rollers between said sleeve and collar; the periphery of said collar being ofl yieldable friction material adapted-to contact with a well casing to protect it from'abrasion when lateral pressure is exerted by the tool string.

't'. A well casing protector comprising; a sleeve adapted for gripping a toolv string intermediate the tool string joints; and a floating collar surrounding said sleeve; said collar having an outside diameter larger than that of said-joints.

LEROY H. PERRY.