US 2203966 A
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Description (OCR text may contain errors)
June 11, 1940. -i c. oT s 2,203,966
SCRAPING DEVICE Filed lay 16, 1938 v 4 Sheets-Sheet 1 In In noted June 1 UNITED- STATES azosm a g r 1 smenavros Herbert 0. our, Dallas, Tex. Application May 16, ms, Serial- No. 208,323
. This invention relates to new and useful improvements inscraping devices.
One object ofthe invention is to provide an improved device which is particularly adapted for use in removing paramn, or other accumulation from the wall oi the bore of well tubing. or other pipe. 7
An important object of the invention is to provide an improved scraping device for removing so that the scraping members thereof are circumi'erentiaily retractible, whereby the outside diameter of the scraper formed by said members may be reduced to; permit lowering of the device through a tubing bore having a coating of parafin therein, without said members scraping or removing the paraifin during such lowering; the
members being automatically expanded on the or accumulation of para on said wall may be accomplished.
Another object of the invention is to provide an improved scraping device including a support having arcuate scraping members mounted thereon, said members being constructed so as to (meet with each other and the support, whereby the members are rigidly sustained in scraping position and .the load imposed thereon is carried by the support, rather than by the members alone.
A further object of the invention is to provide an improved paraflln removing device including a tapered support having radially movable scraping elements mounted to slide vertically thereon, whereby when the blades move verticaly with relation to the support they are expanded or retracted radially so as to vary the diameter of the-scraper formed by the blades;
A still further object of the invention is to provide a scraping device of the character described which may be run into or removed from para from well tubing which-is constructed I constructed in accorce with the invention and showing thescraper members in a retrac position,
Figure 2 is a silar view witnthe scraping members expanded into scraping position,
Figure 3 is a view similar to Figure 2 and viewed at right angles to the latter,
Figure 4: is a horizontal, cross-sectional view taken on the line i-t of e, 2,
Figure 5 is a horinontal, cross-sectional view taken on the line H of Figure 2,
Figure 6 is a hontal, cross-sectional taken on the line 6-6 or t o 2, l Fl 7 is a horizontal, crcss-sectiol view taken on the l-l oi 2,
figure a is an isometric view or the scraper assembly,
Figure 9 is an isometric view of M2; of the sleeve or body which carries the scraper members, and showing the walls thereof in sec tions,
Figure ill is an isometric view or two oi the scraper members,
Figure ii is a transverse, vertical, sectional view taken through the supporting sleeve or body,
Figure i2 is a tramverse, vertical, sectional view talren on the line iii-ii of Figure 11,
, Figure 113 is a horizontal, cross-sectional view taken on the line ld-itl of Figure 11,
Figure 14 is a transverse, vertical, sectional new or a modified form of the invention, with the scraping members in a retracted sition, Figure 15 is a view, ly in elevation and partly in section, of this form oi the invention with the scraping members in an expanded or scraping position,
Figure 16 is aview similar to ri5 and showing the device viewed at a right angle with respect to Figure 15, A
Figure 17 is a horizontal, cross-sectional view taken on the line l'l-l'l of Figure 15,
Figure 18 is a horizontal, cross-sectional view taken on the llne'W-IO of Figure 15,
Figure 19 is a view, partly in elevation and partly in sectiomof another term of the invention, with the scraping members retracted,
Figure 20 is a similar view, with the scraping members expanded into scraping position,
' ing A, or other tubular member.
ly in section, of still another form of the invention,
Figure 23 is a horizontal, cross-sectional view taken on the line 2323 of Figure 22, and
Figure 24 is a plan view of one of the scraping members shown .in Figure 22.
In the drawings, 'the numeral ||l designates an elongate support, or mandrel which has its upperportion substantially cylindrical in crosssection. Below the cylindrical portion, the outer surface of the mandrel is flared or inclined outwardly, as shown at H, and an enlarged flange I2 is preferably made integral with the lower end of the mandrel. The provision of the collar forms an external, annular shoulder I2 at the base of the flared or inclined surface I of said mandrel. The lower end of the collar l2 may be bevelled at its outer peripheral edge to facilitate lowering of the mandrel through a well tub- The upper endof the mandrel I is externally screw-threaded to receive a cap member, or head, I4 which has an external flange. l5 at its upper end. The underside of the flange is recessed or undercut at i6, whereby a suitable tool (not shown) for raising or lowering the mandrel through the tubing may be engaged therewith,
as will be explained.
,A scraper assembly B is slidably mounted on the mandrel l0, being confined between the head 7 l4 and the collar l2. The assembly includes an annular body or sleeve H which surrounds the mandrel and is slidable vertically thereon. A pair of upper scraper members I! and a pair of lower scraper members I! are carried by the body or sleeve and the members have their inner surfaces engaging the outer surface of the mandrel l0, whereby as the sleeve l1 and blades move downwardly of the mandrel, their lower ends are moved outwardly by the inclined surface ll of a said mandrel; upward movement of the sleeve and members permits inward movement of said members to a retracted position (Figure 1).
For mounting the scraper members It and M9 in the sleeve or body H, the bore ll of said sleeve is formed'with an internal, annular recess 20 which is located near the upper endof said bore (Figure 9). A pair of diametrically opposed vertical groovesor channels 2|, are formed in the wall of the bore l1 and extend downwardly from the recess 20 to the lower end of the sleeve and these grooves are adapted to receive the upper scraper members IS. The lower portion of the sleeve is reduced to form an annular skirt 22 and an arcuate notch 2|, which has awidth greater than the width of the grooves 2|, is-provided in the skirt adjacent each groove.
' Each upper scraper membercolnprises a T- shaped shank or arm which is formed with an arcuate cutting blade l8 at its lower end, preferably made integral therewith. The lateral arms Ila. of the shank are arranged to be inserted within the'annular recess 20 and when so inserted, the scraper member is suspended from the shoulder 20' formed by the recess, with the shank I8 extending through the vertical channel 2| and the cutting blade l8 disposed within the notch 2| at the lower end of the sleeve H. The transverse width of the blade is greater than the combined width of the shank and the wall of the sleeve whereby the outer surface of the blade projects beyond the outer surface of the by gravity; or
sleeve l'l when the shank is engaging the bottom of the groove. or channel 2|, as shown in Figure 2.
With the above arrangement, the upper scraper members l8 are suspended from the annular recess 20 and may undergo a limited lateral movement. Displacement of the members is prevented by the outer surface of the mandrel III which is adjacent the inner vertical surfaces of the shanks of the members. When the members l8 are in position within the sleeve, the bottom of each cutting blade I. is substantially flush with the lower edge of the skirt 22.
The lower scraper members l9 are located between the lower members IS, whereby the four members are preferably equally spaced around the sleeve. The lower members are constructed in substantially the same manner as the upper members, except that the shank of each is elongated so as to position the cutting bladesl! below the lower end of the skirt 22 of the sleeve H. The lower members ii are suspended from the annular recess 20 in the same manner as With sucharrange- IQ of the lower members l9, are of such length as to extend through an are greater than ninety degrees, whereby the ends of said blades overlap I each other (Figure 6). This overlapping is possible because the blades I! are disposed in a horizontal plane below the blades l8 (Figures 1 to 3-) and it is preferable that the upper surfaces of the lower blades l9" engage the under- Q side of the overlapping ends of' the upper blades l8, whereby a continuous circumferential scraper is formed by the blades.
In using the device,-the same may be dropped into-the well tubing A so as to fall therethrough 'a suitable tool (not shown) may be engaged beneath the flange l5 to permit lowering. Suitable guide ribs or projections 25 may be formed on the exterior of the sleeve or body to prevent the cutting blades from hanging or catching on the tubing couplings or other irregularities and also to aid in guiding thev same axially through the tubing during its travel 1 theretlirough. At the start of the lowering, the
sleeve may be in the position,. shown in Figure 2, but as soon as the blades or the guides strike a projection or accumulation on the wall of the tubing bore the frictional engagement of said blades or ribs with such projection will cause the sleeve to ride upwardly on the downwardly moving mandrel, whereby the sleeve, and scraper members l8 and I9 carried thereby, are moved to the position shown in Figure 1. In such position, the sleeve and members are opposite the cylindrical upper portion of the mandrel, and the lower ends of the members have moved inwardly, whereby the cutting blades l8 and I! are in a retracted position and the outer diameter of the scraper formed by said blades is reduced to permit fast lowering of the device through the paraffin zone. The lower, outer edges of the blades |8' and I9 are rounded so as to obviate their hanging on the tubing couplings or other irregularities in the tubing A, as
, IT and the scraper members it and ill thereon,
- escapee wardly so that the outersurfaces of the blades I I and Ill be substantially flush with the outer 1 wall of the sleeve I! when in a retracted position.
As is well known, parailln usually accumulates near the upper portion 0! the well tubing and ordinarily, it is notnecessary that the device be lowered to the bottom of the tubing, it being ,suiiicient that it be lowered to a point below the parafiln zone. Any suitable means may be em-. ployed to stop downward movement of the device and in the drawings, a transverse stop pin 25 is disclosed. The pin is located below the paraflin none and extends transversely across the tubing bore; manifestly, when the collar H on the lower end oi the mandrel strikes the pin, further downward movement of the mandrel is prevented.
As the mandrel strikes the pin it and movement thereof is halted, the weight of the sleeve cause the sleeve to slide downwardly on the mandrel into engagement with the shoulder it. Such downward sliding of the mandrel causes the members it and 19 to be moved radially outwardly, due to the engagement of the inner surfaces of said members with the flared or inclined surface ll of the mandrel. Thus, the scraping blades t and it are moved into an expanded or scrap ing position (Figures 2 and 3) and in such position the bottom of each lowerblade it rests on the shoulder It. It is noted in the event that the sleeve ll does not slide downwardly on the mandrel in by gravity, as explained, the device is moved upwardly and when the ribs strike a projection or irregularity on the tubing wall, said sleeve is forced downwardly on the upwardly moving mandrel to expand the blades intomraping position.
The device may be raised to the surface either by the well pressure below the same or by a suitable tool (not shown) engaged with the shoulder it on the head it. AS the device moves upwardly, the expanded overlapping blades and t form a circumferential scraper, which engages the accumulation on the wall of the tubing bore, whereby the bore is scraped clean of the accumulation, such as parafiln. The load imposed on the blades, as they perform the scraping operation is transferred to the shoulder t of rectly on said shoulder, and the upper blades overlie said lower blades at the ends thereof. With such arrangement, the mandrel rather than the scraping members it and t carries the load.
As the device travels upwardly through the tubing bore, the wall of said here is cleaned by the circumferential scraper formed by the scraper blades it and i9. Since the outer expanded diameter of the blades It and it is less than the bore of the tubing, by-pass oi fluid or pressure past said blades may occur. This well fluid flowing upwardly past the upwardly moving device will tend to keep theupper surfaces of the blades clean by lifting the paramn, or other accumulation which has been removed by the blades. The fluid will now past the device at a relatively high velocity, due to the restricted action.
. v a annular passage and said ffluidis thus directed against the accumulation, whereby it will tend to remove the paraflin by a cutting or washing The bore is thus efllciently cleaned upon the upward travel ofthe device. when worn,- the scraper members II and I! may be readily.
replaced by merely removing the head it and the sleeve II from themandrel ii.
.In Figures l4to 18, a modified form 01' the invention is shown. In this form, an elongate mandrel-30 has the upper portion of its outer surface tapered-or inclined at 30' to form an expanding surface. A plurality ofvertical (love tail grooves ll are provided in this: inclined surface and extend from the upper end of the mandrel to a point spaced from the lower end thereof. A sleeve 32 surrounds the mandrel and is slidable vertically with relation thereto. A pair of upper arcuate scraper blades 33 are adapted to fit within arcuate recesses 34 in the outer surface 01 the sleeve and each blade has an inwardly extending arm 35 (Figures 16 and 17) which passes through a radial opening it in the sleeve.
The inner end of each arm 35 is dovetailed so as to slidably engage withinone of the grooves ti of the mandrel.
A pair of lower scraper blades ii are similarly mounted in the sleeve below the blades ti and in odset relation thereto. Manifestly, when the sleeve moves upwardly on the mandrel, the blades 33 and it are retracted, dueto their inner ends riding within the inclined grooves ti (Figure 14); similarly, downward movement of the sleeve on the mandrel causes outward movement oi the blades into scraping position (Figures 15 and it) Displacement oithe blade arms from the upper ends of the grooves ti is prevented by a collar 38 which overhangs the grooves. "l"he collar is made integral with a fishing neck 3% and a depending threaded pin it on said neclr is arranged to be screwed into an opening ill in the upper end oi the mandrel i. -'ll"he operation of this form is the same as the first form, the blades 33 and ti being retracted during lowering and expanded during raising. Retraction and expension of the blades varies the outside diameter or the circumferential scraper formed -by said blades, whereby the device may be readily lowered through the paramn none, and also whereby re-' moval of the accumulation on the wall of the bore is acconiplished when the blades are expended and the device raised.
Y the base of the inclined expanding surface l the mandrel since the lower blades it rest diand below said shoulder the mandrel is cylindrical. At the base oil the cylindrical portion, an external flange i2 is provided. A sleeve ill, similar to the sleeve ll, is slidable on the mandrel and has the scraper members it and it mounted therein in a similar manner to the mounting of the members in the-sleeve ll. However, the lower end of the sleeve dl does not terminate adjacent the blades it and it but extends therebelow to provide 9. depending skirt portion it, which slides on the outer cylindrical portion of the mandrel,
which portion is below the shoulder dd. The
as they perform their scraping operation is trans-v ferred to the mandrel 45.
Still another form of the invention is illustrated in Figures 22 to 24, wherein a tapered mandrel 50 is provided. The mandrel has vertical grooves or channels therein and a pluare slidably mounted on the mandrel.
rality of eccentric superimposed scraper rings 52 Each ring has a scraping surface 53 which extends through an arc of more than ninety degrees and the surfaces 53 are offset radially around the mandrel to form a circumferential scraper. The rings are held in their proper relationship and are guided in their vertical movement, by vertical keys or ribs 54, which are secured to the rings and which engage in the grooves 5|. The rings are con fined on the mandrel between an enlarged collar 55 onthe lower end of said-mandrel and a head 56 on the upper end thereof. A sleeve or collar 58, having guide ribs 59, rests on the uppermost ring 52 and its weight holds the rings in engagement with each other.
may be retracted radially inwardly and when said rings move downwardly on the mandrel, they are expanded into scraping position. The operation.
' of the illustrated construction may be made, with- 'in the scope of the appended claims, without de- 2. A scraping device including, a support having a projection thereon, and arcuate scraping members independently and loosely mounted on the support and freely movable radialiy thereof to an expanded or retracted position, said scraping members coacting with each other to provide continuous circumferential cutting edges and also coacting with 'the projection on the support,
, whereby the membersare rigidly sustained in an expanded position. i
3; A scraping device including, an axial support having a stationary inclined portion on its outer surface, a plurality of scraper membershaving arcuate overlapping scraping faces loosely surrounding the support and forming a circumferential scraper, said members being freely slidable longitudinally of the inclined portion of the support, whereby the scraping faces are retracted and expanded in a radial direction to vary the outside diameter'of the circumferential scraper.
4.. A scraping device including, an axial support When the rings move upwardly on the mandrel, their scraping portions 53 having a stationary inclined portionon its outer surface, a plurality. of scraper members having arcuate overlapping scraping faces loosely surrounding the sup'port and formlnga circumferem tial scraper, said member being freely slidable longitudinally of the inclined portion of the support, means for retaining the members in contact with the inclined portion of the support,
whereby as the members are moved longitudinally on the support'the scraping faces thereof are retracted or expanded in a radial direction.
5. A scraper including, an axial mandrel having an inclined portion on its outer surface, an annular sleeve surrounding the mandrel and movable thereon, and' a plurality of scraper members carried by the sleeve and having arcuate scraping faces, said members being arranged to engage and ride upon the inclined portion of the mandrel, whereby when the sleeve is moved on the mandrel, the scraping members are expanded or contracted.
6. A scraper including, an axial mandrel having an inclined portion on its outer surface, an annular sleeve surrounding ,the mandrel and movable thereon, and a plurality of scraper members carried by the sleeve and having arcuate scraping faces, the scraper faces of adjacent members being located in different horizontal planes and being disposed in overlapping relation so as to form a circumferential scraper, said' members being arranged to engage and ride upon the inclined portion of the mandrel, whereby when the sleeve is moved on the mandrel, the scraping members are expanded or contracted.
'7. A scraper including, an axial mandrel having an inclined portion on its outer surface, a sleeve surrounding the mandrel and movable longitudinally thereof, and a plurality of scraper members mounted within the bore of the sleeve and arranged to swing from their upper ends and having arcuate scraper faces arranged to be expanded so as to project beyond the outer surface of the sleeve and coacting with each other to form a circumferential scraper, the inner surfaces of the members engaging the inclined portion of the mandrel, whereby the members are expanded'or retracted radially when the sleeve is moved longitudinally of the'mandrel.
8. A scraper including, an axial mandrel having an inclined portion on its outer surface, a sleeve surrounding the mandrel and movable longitudinally thereof, and a plurality of scraper members mounted within the bore of the sleeve and arranged to'swing from their upper ends and having arcuate scraper faces arranged to be expanded so as to project beyond the outer surface of the sleeve, the scraper faces of adjacent members'being located in different horizontal planes and being disposed in overlapping relation so as to form a circumferential scraper, the inner surfaces of the members engaging the inclined portion of the mandrel, whereby the members are expanded or retracted radially when the sleeve is moved longitudinally of the mandrel.
9. A scraper for a tubular element including, a i
support, a scraper assembly on the support and having a plurality of overlapping radially movable scraper members mounted to freely move longitudinally of the support and arranged to be retracted to permit the device to be lowered through the tubular element withoutengaging an accumulation on the wall of the bore thereof, means on the mandrel for expanding said members whereby as the device moves through the bore said members remove the accumulation, and
means for transferring the load imposed on the members during the scraping operation 'to the s pport so as to relieve the members of such load. 10. A scraper including, an axial support having a stationary inclined portion, and a plurality of freely movable scraper members surrounding said support and having arcuate overlapping scraping faces, and provided with means co-acting with said inclinedportion whereby they are retracted and expanded by the inclined portion 0! the support when moved longitudinally thereof, said scraping members forming a continuous circumierent'ial scraper when expanded.
11.A.well scraper including, an axial support adapted to be lowered into a well pipe having an accumulation in its bore, and a plurality of radi ally movable scraping members having arcuate overlapping scraping faces disposed to remove said accumulation when the support is moved upwardly therethrough, said scraping members being so loosely and freely mounted on said support as to be readily moved radially inward by said accumulation to reduce the diameter or the scraper when the support is moved downwardly HERBERT C. OTIS.