US2680913A

US2680913A - Caliper for determining the shape and diameter of well bores

Info

Publication number: US2680913A
Application number: US241262A
Authority: US
Inventors: Mordica O Johnston; Jack A Moosman
Original assignee: Johnston Testers Inc
Current assignee: Johnston Testers Inc
Priority date: 1951-08-10
Filing date: 1951-08-10
Publication date: 1954-06-15
Anticipated expiration: 1971-06-15

Description

June 15, 1954 M o JOHNSTON ETAL 2,680,913

CALIPE R F' OR DETERMINING THE SHAPE AND DIAMETER OF WELL BORES Filed Aug. 10, 1951 IIIIIIIII M a: ma:

IN VEN TOR; Maw/a4 a ./0///V570/V JAM 4, MOOJ/VIN provide a well caliper -wardly urged caliper -strained against outward movement; Icyimpact the - well Patented June 15, 1954 'Mordica 0. Johnston,

F Moosman L'os Angel .ELLBQEES Glendale, and Jack A.

es, Galiil, assignors, .by

mesne assignments. to Johnston- Testers} ma,

"H uston,:Tex.,-..a ..-corporation.

of Delaware .Application Angust 10, 1951,.Serial, No. 241,262

4 1 Claims. 1

This invention relates to an oilwelltooland particularly to a caliper for determiningthe shape anddia-meterof well bores.

A main objectof the present invention Vis to having a plurality of gutarms adapted to be reresponsive means which are responsive toan impact to release the arms into engagement'with the walls of a wellbore. 2w

for outward movement Anotherobject of 'the present-Linyention is to provide a well caliper having a plurality of outwardly movable swinga-bly mounted caliper arms each of which is adapted pendently.actuateja.stylus mounted en a key to se a y an ind member which is 'guided' for longitudinal movement,the styluses being arranged; to make .s eparate records on a. suitable chart.

-A further object of the present invention is to; provide a well caliper; as described in the immediately above paragraph in which there are impact responsive means for releasablyhjold- "me a ms in he i Wa nQ itw s r s on iv to an impact to release th arm .pu wai' movement.

Various other objects will be apparent irom followingd s pt take ji .c gne t with the accompanying drawings in which:

"-- lf'ig.- 1 shows a, vertical mid-sectiori through a ent; invention and shown w e. ca r. arm

thereof in retracted positions.

Fig; 2 is a horizontal section through thecaliper disclosed in Fig. 1 taken along linef -'-2 o f Fig-. 1.

; Fig; 3 is a h orizontalsectio n through the caliper disclosed in-Fig; 1 takenfalongline'3+3pf-1 fig 1. "Fig. 4 is a viewsi-rnilar to Fig. 1 but showing the caliper arms as having been released and being inengagement with-the walls-of a wellbore.

Referring to the accompanying drawings,

-Wherein-similar reference characters designate similar parts throughout; the well caliper "comprises a body generally; a plurality' of parts including a tubulargchart entitled '9- made up of l3 and a lower'plug housing I I, an upper plug v connected together 4 5 all suitably =threadedly as -shown; There ;is a wire line socket --l| threadedly received --by-plug -13 and locked in place by a check nut 19. -Body' 9 isadapted to be supported by a wire line 2| end thereof suitably connected to the wire-line "so k it e $u 1 .fae rq having the lower i' i me on w ri l a a. denandinaakirt .Rbari a plurali f.flilicumierentially equally spaced notches therearound to receive a plual bq y e th congentsj fiii enr -the--wellbore.

leasably-locked- W --pair of sheer-pins 5? connecting cap--55 andwire line socket I1.

rality of hell crank sh are swingably mounted for radial movement the walls A,

against the flange 37 to spacethe arms -21.

strained against allowing replacement of the 0 of ;the well caliper.

aped caliper arms 27 which about pivot pins 29 receivable in-dependingsegmer ts 28 formed by notches 25. The lowerends of armsfl', as the parts are depictedin -Fig. 1,

are rounded at SI; for proper engagement with shown in Fig. 4, defining the well bore Supported from lower plug l5 by hanger bolts 33 is a bullnose or guard'member'SE provided forthe purpose of protecting the caliperarms during descent into a well bore. 'Ihe guard member *35 has a flange 31 iormedthereon spaced upwardly from the lower nose portionandcircumferentially slotted at equally spaced pioints thereabout to receive the lower ends of caliper arms 21. Hanger bolts 33 have "the lower ends thereof reduced and threaded to receive nuts ;39,-the upper ends of the hanger bolts being threadedly received by-depending segments-Q28 on plug 15. The reduction of the lower ends of hanger bolts -33 provide shoulders for bearing 7 H 1 uardfi at the proper distance from the-plug l5. Caliper arms -21 are spring-urged outwardly by tension springs 4| hooked at their lower e nds through apertures 43 in flange side offlange 31 and connected at 31 onto-the under- 7 V their upper ends to links--45 swingably' mounted orifpivot pins 41 provided on the upper ends of caliper The upper crank ends of caliper arms 21 are connectedin a manner-tubedescribed to the chart mechanism for making separate records.

The outwardly urged caliperarmsZ'l are reoutward movement by a sleeve 5| telescopically received over body fi and urged upwardly-by a compression spring 53 disposed in engagement with check nut 19 at one end and aicap 55 at its other end,-said cap being threa dedly securedto sleeve 5! as shown-in-Fig. 1. Spring -53;therefore, urges sleeve-5i into a position to uncover the surrounded caliper arms 21 and to-release the arms for outwardradial movement into engagement withthe walls A defining -I-Iowever,- the sleeve- 5 I is I reagainst upwardmovement by. a

' Suitable ;set screws 59 are provided for retaining the .shearpins in place and pins afterpperation Slee e .5 L adan e o be ele se ion upw r increment, nd lijt influ n e, f pr n 5 in} a 0devi1 6| which is received over wireline 2| under the influence of tension springs M.

and dropped down the well into engagement with cap 55, the impact serving to shear pins to allow the upward releasing movement of sleeve 5:. Upon upward movement of sleeve 5i, the caliper arms move outwardly from the position shown in Fig. 1 to the position shown in Fig. 4 into engagement with the walls A of the well bore and each caliper arm is moved inwardly or outwardly, in accordance with the contour of the surface which it encounters, independently and separately from the other caliper arms, thereby indicating the different diameters of the well bore.

As previously mentioned, the upper ends of caliper arms 21 are operatively connected to a chart mechanism for making separate records. This arrangement is as follows: The upper ends of caliper arms 21 are connected by links 65, which preferably form extensions of links 45, to

crossheads 6T slidably received within bore 59 provided in plug !5, said crossheads having pistons l'l slidably extending through the plug l5. There is suitable packing 13 disposed around pistons "J! and held in place by packing glands 15.

Within tubular chart housing ll, is disposed a cylindrical chart support 84 adapted to be constantly driven when the caliper is put in operation by a clock mechanism 83. Disposed about the chart support 531 and slidably fitting within and secured to housing H is a sleeve as having the interior surface thereof disposed in spaced relation to the exterior surface of the cylindrical chart support 8i so as not to interfere with the rotation of the chart support. Sleeve has provided on the exterior thereof a plurality of longitudinal circumferentially spaced keyways $9 for the reception of the shanks 9| of a plurality of key members 93 spring-urged downwardly by compression springs 95 contained between the upper ends of shanks 9| and the shoulders 91 formed on sleeve 85 at the upper terminals of keyways 89. The body portions of the key members are slidably received within downwardly opening clearance slots formed in the lower end of sleeve 85 in registry with the keyways.

Each key member thereto and disposed chart supported on chart support Bl.

Compression springs 95 urge the key members as downwardly into engagement with the upper ends of pistons H. Therefore, any movement, up or down, of pistons ll will serve to effect an equal movement of the particular stylus carried by the key member engaging the movable pistons.

As clearly shown in Fig. 1, the individual styli are staggered with relation to one another so that the records produced thereby do not overlap.

The operation of the device is as follows: When it is desired to caliper a well bore, the caliper may be lowered into the well to the location which is desired to be calipered and a godevil 6! is dropped down the wire line to strike the cap 55 and release the sleeve 5| for upward movement under the influence of compression spring 53. Such upward movement releases the caliper arms 21 for outward radial movement Outward movement of caliper arms 21 results in an accompanying downward movement of pistons H and a following movement of key members 93 carrying styli 99 along the interior of cylindrical chart support 8!. The outward movement of caliper arms 21 will be limited by their contact 93 has a stylus 99 secured in a position to engage a the interior of cylindrical with the walls defining the well bore and eventually by the ngagement of the caliper arms 21 with the walls which define the oblique upper ends of notches 25 in plug Hi. The caliper is then drawn upwardly through the well bore, each caliper arm moving inwardly or outwardly in accordance with the contour of the surface which it engages, therefore making a plurality of separate individual recordings on the chart carried by the cylindrical chart support 8!.

It may also be desirable to caliper the well all the way in and all the way out instead of merely lowering the caliper-into the well and then withdrawing the caliper. However, the normal use will be to lower the caliper into the well and to release the caliper arms by dropping a go-devil down the wire line to effect the release of the caliper arms as previously described.

While we have shown the preferred form of our invention, it is to be understood that various changes may be made in its construction by those skilled in the art without departing from the spirit of the invention as defined in the appended claims.

Having thus described our invention, what we claim and desire to secure by Letters Patent is:

1. A well caliper, comprising a caliper body adapted to be lowered into a well on the lower end of a wire line, a plurality of outwardly urged caliper arms swingably mounted on the caliper body for movement from inward inoperative positions to outward operative positions, a sleeve movably carried by the body and surrounding the upper ends of the arms to retain them in their inward positions, and means located at the top of said body in the vicinity of the wire line for releasably connecting the sleeve to the body in its arm retaining position, said means being responsive to the impact of a go-devil dropped down the wire line to release the sleeve and permit arm releasing movement, and means normally biasing said sleeve toward its arm releasing position whereby the arms can be released at any place along the well bore by positioning the body at such place and dropping a go-devil down the wire line. I

2. A well caliper, comprising a caliper body adapted to be lowered into a well on the lower end of a wire line, a plurality of outwardly urged caliper arms swingably mounted on the caliper body for movement from inward inoperative positions to outward operative positions, a sleeve movably carried by the body and surrounding the upper end of the arms to retain them in their inward positions, spring means urging the sleeve in a direction to release the arms, and means located at the top of said body in the vicinity of the wire line for releasably connecting the sleeve to the body in its arm retaining position, said means being responsive to the impact of a go-devil dropped down the line to release" the sleeve,

whereby the arms can be released at any place along the well bore by positioning the body at such place and dropping a go-devil down the wire line.

3. A well caliper, comprising a caliper adapted to be lowered into a well on the lower i end of a wire line, a plurality of outwardly urged caliper arms swingably mounted on the caliper 1 body for movement from inward inoperative posi- 7 tions to outward operative positions, a sleeve movably carried by the body and surrounding the arms to retain them in their inwardposibody ' tions, a cap at the top of the body secured to the sleeve and through which the wire line extends,

means normally biasing the sleeve toward its arm releasing position, means for holding the sleeve in its arm retaining position responsive to the impact of a go-devil with the cap to release the sleeve for arm releasing movement, whereby the arms can be released at any place along the well bore by positioning the body at such place and dropping a go-devil down the Wire line.

4. A well caliper, comprising a caliper body adapted to be lowered into a well on the lower 10 end of a wire line, a plurality of outwardly urged caliper arms swingably mounted on the caliper body for movement from inward inoperative positions to outward operative positions, a sleeve movably carried by the body and surrounding the arms to retain them in their inward positions, a cap at the top of the body secured to the sleeve and through which the wire line extends, spring means urging the sleeve in a direction to release the arms, and means for holding the sleeve in its arm retaining position, responsive to the impact of a go-devil with said cap to release the sleeve for arm releasing movement.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 713,784 Mellor Nov. 18, 1902 2,102,080 Kinley Dec. 14, 1937 2,267,110 Kinley et a1. Dec. 23, 1941 2,340,987 Robidoux Feb. 8, 1944 2,392,357 Bays Jan. 8, 1946 2,415,636 Johnson Feb. 11, 1947 2,497,990 Huber et al Feb. 21, 1950 2,518,663 Chaney et al Aug, 15, 1950