Патент USA US2128593код для вставки
Ag. 30, 1938. c, R, PHILUPS 2,128,593 TUléING AND CASING STRIPPER FOR WELLS Filed April 14, 1958 5E i E N“3 g \ \ \\\ Egg: 5 ‘(Alia-f: GM IN [EN-FOE‘ iii/1.ATTORNEY 2,128,593 Patented Aug. 30, 1938 UNITED STATES PATENT OFFlCE . 2,128,593 TUBING AND CASING STRIPPER FOR WELLS Charles R. Phillips, Mannington, W. Va. Application April 14, 1938, Serial No. 201,969 4 Claims. (Cl. 164—0.3) This invention relates broadly to a tool ‘for fa cilitating the withdrawal and removal of tubing or casing from wells, and more particularly to a tool adapted to be used in the freeing of certain sec tions of well tubing or casing that offer obstinate resistance to withdrawal. ' One of the objects of the invention is to provide a cutting tool or “casing ripper” adapted to be lowered into the tubing or casing of a well and then operated to cut or slit the lower end of a sec tion of tubing or casing so that said section may be pulled or stripped from a coupling or collar by means of which two adjacent sections are con nected. ' - . Another object of the invention is to provide a tool of the character referred to wherein the cut ter blade may, after performing its desired func— tion, be automatically retracted toinoperative po sition out of contact with the tubing or casing, thus facilitating removal of the tool from the well. ‘Such automatic retraction of the cutter blade after cutting prevents objectionable mutila tion of the coupling; prevents the blade from per forating the casing after slitting the tube, and prevents the blade from being broken by engage ment with the wall of the well. With these and other objects in view, the in vention resides in the features of construction, ar rangement of parts, and combination of elements 30 which will hereinafter be described, reference be ing had to the accompanying drawing, in which— Figure 1 is a side elevational view of the device in a well tubing or casing; Figure 2 is a detail view, in side elevation, of the cutting mechanism, parts thereof being broken away; Figure 3 is a front or face. view of the same; Figure 4 is a sectional view taken on line 4-—4 of Fig. 2; and Figure 5 is a detail view of an end of a section of tubing or casing after slitting. The device comprises a rod 1 having leaf springs 2 attached thereto for properly guiding and positioning the tool in the tubing or casing 3. The housing 4 for the cutting mechanism is lo 4.5 cated at the upper end of the rod I. Snugly re ceived within a pocket 5 provided in the housing t and maintained therein by .a pin 6 are spaced plates 1, the latter being fastened together to form a unit by rivets 8. Each plate ‘I has a slot 9 provided in its wall .and slidably received within each slot 9 is a slide block it. A pin ll connects the two slide blocks and pivotally supported on said pin H intermediate the plates 1 is the cut ting blade l2, the cutting point or edge normally protruding outwardly of the tool and in contact with the tubing or casing by reason of the provi sion of a spring pressed pin I3 which underlies the blade l2 adjacent its inner end and exerts an upward pressure thereon. Said spring and pin l3 are housed in an aper ture provided in a spacing member I5 interposed between the two plates 1 below the cutter l2, and. the upper end of said spacer terminates in a shoulder I6 whose forward edge abuts the inner 10 extremity of the cutter [2. As shown in Fig. 2,‘ the inner extremity of the cutter i2 is curved on a radius corresponding to the curvature of the for ward end of the shoulder so that the two elements snugly inter?t. When in this position, the slide 15 blocks H) occupy a forward position in the slots 9 and the cutting edge of the blade l2 protrudes from the tool in operative position. When it is desired to strip a section of the tub ing from a well,- the device is lowered into the tubing 3 by a cable (not shown) until it reaches the desired point, which point is always at a loca tion in the depth of the well where two sections 3 are joined together by .a collar I'I. During lower ing of the tool into the well, the cutter blade I! 25 frictionally rides inoperatively against the tubing 3 and against the pressure exerted by the spring presed pin l3. When, however, the point to be severed is reached, the spring impelled cutter I2 is forced outwardly beneath the lower end of the section of tubing 3 and the leaf springs 2 fric tionally contact the inner surface of the well tub ing and function to maintain the tool in operative position, as illustrated in Fig. 1. With the tool so positioned it is drawn up wardly by its supporting cable. Such elevation results in the cutting edge of the blade l2 goug ing into the tubing 3 and continued elevation of the tool cuts a slit (shown at 20 in Fig. 5) in said tubing, thus ripping the tubing from its col 40 lar 11. When the upper end of the collar is reached in the ripping operation, the point of the cutting edge of the blade l2 will be projected outwardly through the tubing and engaged there by, and continued elevation of the tool will result in slight rotation of the cutter l2 on its pin ll. As the cutter rotates, its rear or inner extremity is brought out of abutting relation with the ?xed shoulder I6. Being thus left unsupported, the slide blocks I!) move rearwardly in their slots 9 because of the pressure of the tubing on the cut ting edge of the blade l2, and, as a consequence, the entire mechanism, including the cutter I2, is retracted inwardly and the cutting edge of the blade I2 is brought out of contact with the tubing 55 2 2,128,593 and gravitates about its pivot pin II to a recess 22 between the two plates 1. As a result, the cutter is entirely con?ned within the tool after the cutting operation is completed so that neither the tubing, the collar, or the tool can thereafter be damaged by withdrawal of the tool from the well. ment of the blade in a prescribed arc about its pivot to permit the pivotal means to move in After ripping and withdrawal of the tool, the ripped section may be removed from the well, after which an appropriate ?shing toolmay be engaged with the collar and the balance removed. Although I have illustrated and described cer tain of the preferred embodiments of the inven tion, it will be apparent that various changes and alterations might be made in the general form and arrangement of parts described without de parting from the invention. Hence, it is not in tended to be limited to the precise details set forth, and I shall consider myself at liberty. to make such changes and alterations as fairly "fall within the spirit and scope of the appended claims. wardly of said housing, ?xed means in said hous ing and engageable with the cutter blade for maintaining the cutting edge outwardly of said housing, said last mentioned means being adapted to be disengaged from said blade following move . > - What is claimed is: 1. A tool for‘ cutting well casing sections com prising a housing, a cutter blade pivoted in said housing and having a cutting edge at its outer end projecting from the housing, means whereby the cutter blade may be moved inwardly of said housing to retracted position in said housing, 30 and means in said housing and engageable with the cutter blade for maintaining it in its out ward operative position, said last mentioned means being adapted to be disengaged from said blade following movement of the blade about its pivot in a prescribed arc to permit said cutter blade to be retracted within the housing. 2. A tool for cutting well casing sections com prising a housing, a cutter blade having its cut ting edge projecting from said housing, pivotal means for supporting said cutter blade, said pivotal means being slidable inwardly and out wardly of said housing for retracting the cutter blade. 3. A tool for cutting well casing sections com~ 10 prising a housing, a cutter blade pivoted in said housing and having a cutting edge at its outer end projecting from the housing, means permit ting the cutter blade to be moved inwardly of said‘ housing to retracted position in said hous 15 ing, a fixed shoulder in said housing engageable with the inner end of said cutter blade for main taining the latter in its outward operative posi tion, said blade being adapted to be brought out of abutting relation with said shoulder follow ing movement 'of’the blade about its pivot in a prescribed arc whereby said blade is permitted to be retracted to inoperative position inwardly of the housing. 4. A tool for cutting well casing sections- com 25 prising a housing, oppositely disposed transverse slots provided in said housing adapted to receive slide blocks therein, a pivot pin connecting said slide blocks and supporting a cutter blade, means in said housing and engageable with’ the.cutter 30 blade for maintaining said slide blocks in a for wardly position in their slots so that the cutting edge of the blade protrudes outwardly of the housing, said last mentioned means being adapted to be disengaged from said blade following move 35 ment of the blade about its pivot in a prescribed arc so that said slide blocks are permitted to move rearwardly in their slots to retract the cutter blade to inoperative position. CHARLES R. PHILLIPS.