CA1226518A - Inflatable packer - Google Patents
Inflatable packerInfo
- Publication number
- CA1226518A CA1226518A CA000452083A CA452083A CA1226518A CA 1226518 A CA1226518 A CA 1226518A CA 000452083 A CA000452083 A CA 000452083A CA 452083 A CA452083 A CA 452083A CA 1226518 A CA1226518 A CA 1226518A
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- inflatable
- tubular mandrel
- mandrel
- roughened
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Disclosed is an inflatable packer including a tubular mandrel, a pair of collars secured to the mandrel, and an inflatable sleeve connected between the collars about the mandrel. The exterior sur-face of the mandrel underlying the sleeve is roughened to increase the coefficient of friction between the mandrel and the sleeve.
Disclosed is an inflatable packer including a tubular mandrel, a pair of collars secured to the mandrel, and an inflatable sleeve connected between the collars about the mandrel. The exterior sur-face of the mandrel underlying the sleeve is roughened to increase the coefficient of friction between the mandrel and the sleeve.
Description
I RATABLE PACKER
BACKGROUND OF THE INVENTION
-A. Field of the Invention -The present invention relates generally to 5 packers for use in oil and gas wells for providing annular seals between the outside owe pipe and the surrounding surface of the Barlow or casing, and more particularly to inflatable packers having long inflatable sleeves adapted to be inflated with a cement slurry, having means for increasing the friction between the pipe and the inflatable sleeve.
B. Description of the Prior Art Inflatable packers of the typo disclosed 3 for example, in US. Patent No. 3,640,732, or US.
Patent No. 3,837,947, Dave been used for many years. Such packer include a tubular mandrel that is covered by an inflatable sleeve secured to the mandrel by a pair of axially spaced apart collar.
The sleeve is normally reinforced by a reinforcing sheath, which comprises a plurality ox overlapping ribs connected between the collars. Valve eons are provided for allowing inflating fluid to enter between the exterior of the mandrel and the inlay-table sleeve to inflate the sleeve into sealingc~ntact with the Wilbur or cuing. Such inflow-table packers function to isolate toe annul above 60B IPCl the packer from that below and, accordingly, need to be only of a length long enough to Norm an effective seal.
More recently, there have been developed inflow-table packers for use in well completion, which readapted to be positioned adjacent the producing zone and inflated with cement. After the cement has set, the packer is perforated and the well is produced through the packer. Examples of such inflatable packers are disclosed, for example, in US. Patent No. 3,918,522, US. Patent No. Rev 40,711, and US. Patent No. 3,907,034. Such inflatable packers tend to be relatively long, i.e.
from 10 feet to 40 feet in length, in order to seal against both the producing formation, which is per forayed, and the formations above end below the producing formation.
Since the completion type inflatable packers are of such length, the centrfll portion of the inflatable sleeve is supported and in effect, reinforced by the bore~lole. Accordingly, a rein-forcing sheath it unnecessary in the central part of the inflatable sleeve. However reinforcing is necessary adjacent the ends of the inflatable I sleeve to prevPn~ the inflatable sleeve from extruding past the securing collar or hlowin~ out.
Therefore, toe inflatable sleeves of the complexion type packers ore normally reinforced only it the ends doesn't the securing koalas.
Lo As inflatable packers are run into the bore-hole, there is sometimes kinetic between the inflow-table sleeve and the Barlow wall. Such contact is particularly lawlessly in David holes. Contact between the sleeve and the Barlow wall during movement causes frictional forces to be applied to the sleeve what tend to move the sleeve with respect to the mandrel. In short length inflatable packers with continuous reinforcing sheaths, the reinforcing sheath provides a measure of stiffness to the sheath which prevents axially movement due to frictional Wilbur contact. However, in the case of long paclcers with largely unreinforced inflatable sleeves, when the coefficient of Eric-lion between the Wilbur and the sleeve exceeds the coefficient of friction between rubber and the mandrel, the sleeve can move with respect to the mandrel. Such movement can cause thickening of the sleeve at the upper end of the inflatable packer and can deform outwardly the upper reinforcing material. In some instances 3 the movement of the sleeve along the mandrel can cause the diameter of the packer to become greater than that of the bore-hole, in which case the packer becomes stuck.
A solution Jo the problem o-f movement of the inflatable sleeve with respect to the mandrel is provided in US, Patent No. 4~311,314, which discloses an inflatable packer having nun inflatable Lo sleeve mounted on a tubular mandrel that is covered with a gritty sand paper-like material The grit particles are bonded to the outer surface of the mandrel by a suitable binder, such as an epoxy resin, as for example the adhesive sold under the trademark EON by Shell Chemical Corporation. The coefficient of friction of the inflatable sleeve on the grit covered surface is much higher than the coefficient of friction between the inflatable sleeve and a Barlow wall. Accordingly, the improvement of US. Patent 4,311,314, very effect lively solve the problem of the movement of the inflatable sleeve with respect to the mandrel.
However, there has been developed recently, new cement bond log equipment that is gaining suntan trial industry acceptance. Unfortunately, epoxy resin acoustically decouples steel from cement.
While the bond between the mandrel and the epoxy and between the epoxy and the cement try be per-Erectly good, the new cement bond logging equipm~ntindicates that proper bonding has not been achieved.
It is therefore an object of the present liven-lion to provide an inflatable packer having a high coefficient of friction between the mandrel and the inflatable sleeve thou including a grit like coating.
3~2~5~
-5- 8313-71 PLB:kar SUMMARY OF THE INVENTION
In a broad aspect, the invention resides in an inflatable packer comprising a tubular mandrel having a rough-eyed exterior surface intermediate the ends thereof, an inflate able sleeve surrounding said tubular mandrel in frictional con-tact with the roughened exterior surface, means for sealingly securing the ends of the inflatable sleeve to the tubular mandrel, and jeans for inflating the inflatable sleeve.
In a preferred embodiment the inflatable packer includes a tubular mandrel that is covered by an elastic sleeve. The ends of the elastic sleeves are connected to and sealed with the mandrel by a pair of spaced apart collars. One of the collars has means for allowing inflating fluid to enter between the inflatable sleeve and the mandrel to inflate the sleeve. The tubular mandrel is easing that has an outside die-meter and wall thickness greater than the minimums jet by ASP. T . for casing. The exterior surface of the tubular mandrel it roughened to provide an increased coefficient of friction with the inflatable sleeve. The surface depth of the roughen-in is such that the outside diameter and wall thickness of the mandrel within the roughening remains greater than APE.
minimums. Preferably, the roughened exterior is provided by gnarling.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is 2 quarter sectional view of a packer of the preferred embodiment of the present invention.
Figure 2 is an enlarged sectional view showing the interface between thy tubular mandrel and the inflatable sleeve of the preserlt invention.
Fig. 3 is a view taken along line 3-3 of Fig.
I showing a detail of a portion owe the surface of the mandrel of the inflatable packer of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
-Referring now to the drawing, and first to Fig.
1, the inflatable packer of the present invention is designated generally by the numeral 11. Packer : 11 includes a tubular mandrel 13~ which in the pro furred embodiment is a length of casing or the like having threaded portions 15 and 17 at its respect live ends Threaded portions 15 and 17 are adapted to receive and connect with, respectively, a valve collar 19 and a blank collar 21, which in urn are adapted to be connected between adjacent other tubular member 23 and 25 respectively to form a string of pipe.
Valve collar 19 is of the type disclosed generally in ITS Patent No. 3,437,142, and inkwell dyes a passageway 27, having an inlet 29 and an outlet 31, for the flow of inflating fluid there through. Passageway 27 includes valve means 33 for preventing the flow of inflating fluid through passageway 27 until a certain preselected pressure d:Lfferen~lal is achieved an for pro venting flow of fluid from outlet 31 to inlet 29.
Inflatable packer if includes an inflatable sleeve 35 of a rubber like el~stomer positioned aye about tubular mandrel 13 and connected between collars 19 and 21 by a pair of spaced apart heads 37 and 39, respectively. Heads 37 and 39, respect lively, have connected thereto longitudinally extending reinforcing element 41 and 43. In the preferred embodiment, reinforcing elements 41 and 43 comprise a plurality of longitudinally extending overlapping fibs connected at one end to the heads and extending into and embedded in the material of inflatable sleeve 35. As inflatable sleeve 35 is inflated, the ribs of reinforcing elements 41 and 43 separate and expand.
Referring now to Fig. 2, there is shown in detail the interface between tubular mandrel lo and inflatable sleeve 35. Fig. 2 depicts a portion of such interface in the vicinity of lower reinforming element 41. As shown in Fig. 2, the exterior sun-face of tubular mandrel 13 axially above the end of lower reinforcing element 41 is roughened, as India cawed generally at 45. The roughened exterior our-face 45 extends axially upwardly to the vicinity of the lower end of upper reinforcing element 43. As shown in Fig, 3, in toe preferred embodLmen~, roughened surface I is formed by a plurality of closely spaced apart orthogonal groQV~q which pry-sent a knurled appearance. In thy preferred embo-dominate thy grooves of roughened Sirius 45 are formed ho brinelling the surface with plural ~2~5~
of rollers. However, those skilled in the art will recognize alternative method of forming the Icn~lrling pattern, as for example, by scratching or cutting the surface of tubular mandrel 13. Also in the preferred embodiment, the grooves which comprise knurl surface 45 are pluralities of ortho-gonad helical grooves, but whose skilled in the at will recognize other patterns as I examples orthogonal longitudinal and circumferential grooves. While roughened surface 45 is preferably formed by gnarling, those skilled in the art Jill recognize al~ernatlve methods of roughening the pipe. For example, roughened surface 45 may be foxed by abrasive sand or grit blasting" chemical pitting, or the like.
It is important, during the formation or roughened surface 45, that the grooves not be so deep as to make the wall thickness of tubular mandrel lo less than the minimum wall thickness end outside diameter prescribed by the American Petroleum Institute, APE. Spew SAY for casing of the diameter of tubular mandrel 13. Thus, prior to formation of roughened surface 45, pipe from which tubular mandrel 13 it formed is selected to have on ought diameter OLD. and wall thlckne~s treater azalea the minimum jet by APE. The depth of roughening by gnarling or the live I theft selected such that after roughening, the outloud diameter sly and wall thickness of the pipe radially beneath the roughening remains at least equal to the APE.
minimums. For example, the APE. specific~tlons require that for casing greater than I inch out-side diameter, the tolerances for outside diameter be -~0.75~ and for wall thickness be -12.5%~ Thus, for 7 inch 26.0 pound per foot casing the outside diameter Jay vary from 6.9475 inches to 7.0525 inches. The wall thickness specified for such casing is 0.362 inches, but may be, within tolerance, as low as 0.316 inches. The pipe LO
thus selected having an outside diameter and wall thickness greater than the respective minimums and the depth the roughening is selected such that the undisturbed material underlying the roughening it equal to or greater than the minimums. It has keen discovered that the grooves of roughened surface 45 need not be very deep in order to provide a sub-staunchly coefficient of friction with the rubber-I like material of inflatable sleeve 45. Indeed grooves less than 0.05 inches in depth will increase substantially the coefficient of friction.
Referring still to Figs. 2 and 3, tubular mandrel 13 includes a smooth outer surf~cP 47 axially below the end of re~nEorcing element 41.
Tubular mandrel 13 includes similar sooth sun-face axially above the end of upper re-lnforcin~
element 43. Smooth portion 47 allows lower herd Al I
with reinforcing element 41 embedded in the rubber-like material to be slipped axially thereon and to be interconnected with valve collar 19. Upper head 39 with reinforcing element 34 may likewise be slipped over the axially pyre smooth portion of tubular mandrel `13 and interconnected with collar 21. With heads 37 and 39 so positioned, the remainder of inflatable sleeve 35 may be laid in strops fashion upon tubular mandrel 13 and cured in place. The material of sleeve 35 conforms to and intermits with roughened surface 45 of tubular mandrel 13.
From the foregoing it will be seen that this invention is one well adapted to attain nil of the ends and objects honeybee set forth, together with other advantages which are obvious and which are inherent to the apparatus.
It will be understood that certain features and subcombinAt:ion~ are ox utility and Jay be employed with reference to other features and ~ubcom-binations. This is contemplated by and is within the scope of` the claims.
As many possible embodiments may be made of the invention without departitlg from the scope thereof, I I Lo to be understood aye all matter herein jet -forth of Shelley Lo the ~ccompanyit g drawings is to be interpreted AS illustrative and not in a l~lmitin~ sense.
BACKGROUND OF THE INVENTION
-A. Field of the Invention -The present invention relates generally to 5 packers for use in oil and gas wells for providing annular seals between the outside owe pipe and the surrounding surface of the Barlow or casing, and more particularly to inflatable packers having long inflatable sleeves adapted to be inflated with a cement slurry, having means for increasing the friction between the pipe and the inflatable sleeve.
B. Description of the Prior Art Inflatable packers of the typo disclosed 3 for example, in US. Patent No. 3,640,732, or US.
Patent No. 3,837,947, Dave been used for many years. Such packer include a tubular mandrel that is covered by an inflatable sleeve secured to the mandrel by a pair of axially spaced apart collar.
The sleeve is normally reinforced by a reinforcing sheath, which comprises a plurality ox overlapping ribs connected between the collars. Valve eons are provided for allowing inflating fluid to enter between the exterior of the mandrel and the inlay-table sleeve to inflate the sleeve into sealingc~ntact with the Wilbur or cuing. Such inflow-table packers function to isolate toe annul above 60B IPCl the packer from that below and, accordingly, need to be only of a length long enough to Norm an effective seal.
More recently, there have been developed inflow-table packers for use in well completion, which readapted to be positioned adjacent the producing zone and inflated with cement. After the cement has set, the packer is perforated and the well is produced through the packer. Examples of such inflatable packers are disclosed, for example, in US. Patent No. 3,918,522, US. Patent No. Rev 40,711, and US. Patent No. 3,907,034. Such inflatable packers tend to be relatively long, i.e.
from 10 feet to 40 feet in length, in order to seal against both the producing formation, which is per forayed, and the formations above end below the producing formation.
Since the completion type inflatable packers are of such length, the centrfll portion of the inflatable sleeve is supported and in effect, reinforced by the bore~lole. Accordingly, a rein-forcing sheath it unnecessary in the central part of the inflatable sleeve. However reinforcing is necessary adjacent the ends of the inflatable I sleeve to prevPn~ the inflatable sleeve from extruding past the securing collar or hlowin~ out.
Therefore, toe inflatable sleeves of the complexion type packers ore normally reinforced only it the ends doesn't the securing koalas.
Lo As inflatable packers are run into the bore-hole, there is sometimes kinetic between the inflow-table sleeve and the Barlow wall. Such contact is particularly lawlessly in David holes. Contact between the sleeve and the Barlow wall during movement causes frictional forces to be applied to the sleeve what tend to move the sleeve with respect to the mandrel. In short length inflatable packers with continuous reinforcing sheaths, the reinforcing sheath provides a measure of stiffness to the sheath which prevents axially movement due to frictional Wilbur contact. However, in the case of long paclcers with largely unreinforced inflatable sleeves, when the coefficient of Eric-lion between the Wilbur and the sleeve exceeds the coefficient of friction between rubber and the mandrel, the sleeve can move with respect to the mandrel. Such movement can cause thickening of the sleeve at the upper end of the inflatable packer and can deform outwardly the upper reinforcing material. In some instances 3 the movement of the sleeve along the mandrel can cause the diameter of the packer to become greater than that of the bore-hole, in which case the packer becomes stuck.
A solution Jo the problem o-f movement of the inflatable sleeve with respect to the mandrel is provided in US, Patent No. 4~311,314, which discloses an inflatable packer having nun inflatable Lo sleeve mounted on a tubular mandrel that is covered with a gritty sand paper-like material The grit particles are bonded to the outer surface of the mandrel by a suitable binder, such as an epoxy resin, as for example the adhesive sold under the trademark EON by Shell Chemical Corporation. The coefficient of friction of the inflatable sleeve on the grit covered surface is much higher than the coefficient of friction between the inflatable sleeve and a Barlow wall. Accordingly, the improvement of US. Patent 4,311,314, very effect lively solve the problem of the movement of the inflatable sleeve with respect to the mandrel.
However, there has been developed recently, new cement bond log equipment that is gaining suntan trial industry acceptance. Unfortunately, epoxy resin acoustically decouples steel from cement.
While the bond between the mandrel and the epoxy and between the epoxy and the cement try be per-Erectly good, the new cement bond logging equipm~ntindicates that proper bonding has not been achieved.
It is therefore an object of the present liven-lion to provide an inflatable packer having a high coefficient of friction between the mandrel and the inflatable sleeve thou including a grit like coating.
3~2~5~
-5- 8313-71 PLB:kar SUMMARY OF THE INVENTION
In a broad aspect, the invention resides in an inflatable packer comprising a tubular mandrel having a rough-eyed exterior surface intermediate the ends thereof, an inflate able sleeve surrounding said tubular mandrel in frictional con-tact with the roughened exterior surface, means for sealingly securing the ends of the inflatable sleeve to the tubular mandrel, and jeans for inflating the inflatable sleeve.
In a preferred embodiment the inflatable packer includes a tubular mandrel that is covered by an elastic sleeve. The ends of the elastic sleeves are connected to and sealed with the mandrel by a pair of spaced apart collars. One of the collars has means for allowing inflating fluid to enter between the inflatable sleeve and the mandrel to inflate the sleeve. The tubular mandrel is easing that has an outside die-meter and wall thickness greater than the minimums jet by ASP. T . for casing. The exterior surface of the tubular mandrel it roughened to provide an increased coefficient of friction with the inflatable sleeve. The surface depth of the roughen-in is such that the outside diameter and wall thickness of the mandrel within the roughening remains greater than APE.
minimums. Preferably, the roughened exterior is provided by gnarling.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is 2 quarter sectional view of a packer of the preferred embodiment of the present invention.
Figure 2 is an enlarged sectional view showing the interface between thy tubular mandrel and the inflatable sleeve of the preserlt invention.
Fig. 3 is a view taken along line 3-3 of Fig.
I showing a detail of a portion owe the surface of the mandrel of the inflatable packer of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
-Referring now to the drawing, and first to Fig.
1, the inflatable packer of the present invention is designated generally by the numeral 11. Packer : 11 includes a tubular mandrel 13~ which in the pro furred embodiment is a length of casing or the like having threaded portions 15 and 17 at its respect live ends Threaded portions 15 and 17 are adapted to receive and connect with, respectively, a valve collar 19 and a blank collar 21, which in urn are adapted to be connected between adjacent other tubular member 23 and 25 respectively to form a string of pipe.
Valve collar 19 is of the type disclosed generally in ITS Patent No. 3,437,142, and inkwell dyes a passageway 27, having an inlet 29 and an outlet 31, for the flow of inflating fluid there through. Passageway 27 includes valve means 33 for preventing the flow of inflating fluid through passageway 27 until a certain preselected pressure d:Lfferen~lal is achieved an for pro venting flow of fluid from outlet 31 to inlet 29.
Inflatable packer if includes an inflatable sleeve 35 of a rubber like el~stomer positioned aye about tubular mandrel 13 and connected between collars 19 and 21 by a pair of spaced apart heads 37 and 39, respectively. Heads 37 and 39, respect lively, have connected thereto longitudinally extending reinforcing element 41 and 43. In the preferred embodiment, reinforcing elements 41 and 43 comprise a plurality of longitudinally extending overlapping fibs connected at one end to the heads and extending into and embedded in the material of inflatable sleeve 35. As inflatable sleeve 35 is inflated, the ribs of reinforcing elements 41 and 43 separate and expand.
Referring now to Fig. 2, there is shown in detail the interface between tubular mandrel lo and inflatable sleeve 35. Fig. 2 depicts a portion of such interface in the vicinity of lower reinforming element 41. As shown in Fig. 2, the exterior sun-face of tubular mandrel 13 axially above the end of lower reinforcing element 41 is roughened, as India cawed generally at 45. The roughened exterior our-face 45 extends axially upwardly to the vicinity of the lower end of upper reinforcing element 43. As shown in Fig, 3, in toe preferred embodLmen~, roughened surface I is formed by a plurality of closely spaced apart orthogonal groQV~q which pry-sent a knurled appearance. In thy preferred embo-dominate thy grooves of roughened Sirius 45 are formed ho brinelling the surface with plural ~2~5~
of rollers. However, those skilled in the art will recognize alternative method of forming the Icn~lrling pattern, as for example, by scratching or cutting the surface of tubular mandrel 13. Also in the preferred embodiment, the grooves which comprise knurl surface 45 are pluralities of ortho-gonad helical grooves, but whose skilled in the at will recognize other patterns as I examples orthogonal longitudinal and circumferential grooves. While roughened surface 45 is preferably formed by gnarling, those skilled in the art Jill recognize al~ernatlve methods of roughening the pipe. For example, roughened surface 45 may be foxed by abrasive sand or grit blasting" chemical pitting, or the like.
It is important, during the formation or roughened surface 45, that the grooves not be so deep as to make the wall thickness of tubular mandrel lo less than the minimum wall thickness end outside diameter prescribed by the American Petroleum Institute, APE. Spew SAY for casing of the diameter of tubular mandrel 13. Thus, prior to formation of roughened surface 45, pipe from which tubular mandrel 13 it formed is selected to have on ought diameter OLD. and wall thlckne~s treater azalea the minimum jet by APE. The depth of roughening by gnarling or the live I theft selected such that after roughening, the outloud diameter sly and wall thickness of the pipe radially beneath the roughening remains at least equal to the APE.
minimums. For example, the APE. specific~tlons require that for casing greater than I inch out-side diameter, the tolerances for outside diameter be -~0.75~ and for wall thickness be -12.5%~ Thus, for 7 inch 26.0 pound per foot casing the outside diameter Jay vary from 6.9475 inches to 7.0525 inches. The wall thickness specified for such casing is 0.362 inches, but may be, within tolerance, as low as 0.316 inches. The pipe LO
thus selected having an outside diameter and wall thickness greater than the respective minimums and the depth the roughening is selected such that the undisturbed material underlying the roughening it equal to or greater than the minimums. It has keen discovered that the grooves of roughened surface 45 need not be very deep in order to provide a sub-staunchly coefficient of friction with the rubber-I like material of inflatable sleeve 45. Indeed grooves less than 0.05 inches in depth will increase substantially the coefficient of friction.
Referring still to Figs. 2 and 3, tubular mandrel 13 includes a smooth outer surf~cP 47 axially below the end of re~nEorcing element 41.
Tubular mandrel 13 includes similar sooth sun-face axially above the end of upper re-lnforcin~
element 43. Smooth portion 47 allows lower herd Al I
with reinforcing element 41 embedded in the rubber-like material to be slipped axially thereon and to be interconnected with valve collar 19. Upper head 39 with reinforcing element 34 may likewise be slipped over the axially pyre smooth portion of tubular mandrel `13 and interconnected with collar 21. With heads 37 and 39 so positioned, the remainder of inflatable sleeve 35 may be laid in strops fashion upon tubular mandrel 13 and cured in place. The material of sleeve 35 conforms to and intermits with roughened surface 45 of tubular mandrel 13.
From the foregoing it will be seen that this invention is one well adapted to attain nil of the ends and objects honeybee set forth, together with other advantages which are obvious and which are inherent to the apparatus.
It will be understood that certain features and subcombinAt:ion~ are ox utility and Jay be employed with reference to other features and ~ubcom-binations. This is contemplated by and is within the scope of` the claims.
As many possible embodiments may be made of the invention without departitlg from the scope thereof, I I Lo to be understood aye all matter herein jet -forth of Shelley Lo the ~ccompanyit g drawings is to be interpreted AS illustrative and not in a l~lmitin~ sense.
Claims (11)
1. An inflatable packer, which comprises:
a tubular mandrel having a roughened exterior surface intermediate the ends thereof;
an inflatable sleeve surrounding said tubular mandrel in frictional contact with said roughened exterior surface;
means for sealingly securing the ends of said inflatable sleeve to said tubular mandrel;
and means for inflating said inflabable sleeve.
a tubular mandrel having a roughened exterior surface intermediate the ends thereof;
an inflatable sleeve surrounding said tubular mandrel in frictional contact with said roughened exterior surface;
means for sealingly securing the ends of said inflatable sleeve to said tubular mandrel;
and means for inflating said inflabable sleeve.
2. The inflatable packer as claimed in claim 1 wherein the tubular mandrel has an outside diameter and wall thickness radially within the roughened exterior surface that is at least equal to the respective minimums established by the American Petroleum Institute for casing.
3. The inflatable packer as claimed in claim 1, wherein said roughened exterior surface is defined by a knurled pattern on the exterior of said tubu-lar mandrel.
4. The inflatable packer as claimed in claim 3, wherein said roughened exterior surface is defined by a plurality of first helical grooves formed in the exterior of said tubular mandrel and of second helical grooves formed in said exterior of said tubular mandrel substantially orthogonal to said first helical grooves.
5. An inflatable packer, which comprises:
a tubular member having an outside diameter and wall thickness at least equal to the respective minimums established for casing by the American Petroleum Institute;
a pair of axially spaced apart collars con-nected to said tubular member;
an inflatable sleeve connected to and extending between said collars and having an interior surface engaging the exterior surface of said tubular member;
means for reinforcing the ends of said infla-table sleeve adjacent said collars with said sleeve being unreinforced between said reinforcing means;
means for conducting inflating fluid between said inflatable sleeve and said tubular mandrel to inflate said inflatable sleeve;
and wherein said tubular member includes a roughened exteral surface underlying the unrein-forced portion of said sleeve, wherein the outside diameter and wall thickness of said external member radially within said roughened external surface are at least equal to said established minimums.
a tubular member having an outside diameter and wall thickness at least equal to the respective minimums established for casing by the American Petroleum Institute;
a pair of axially spaced apart collars con-nected to said tubular member;
an inflatable sleeve connected to and extending between said collars and having an interior surface engaging the exterior surface of said tubular member;
means for reinforcing the ends of said infla-table sleeve adjacent said collars with said sleeve being unreinforced between said reinforcing means;
means for conducting inflating fluid between said inflatable sleeve and said tubular mandrel to inflate said inflatable sleeve;
and wherein said tubular member includes a roughened exteral surface underlying the unrein-forced portion of said sleeve, wherein the outside diameter and wall thickness of said external member radially within said roughened external surface are at least equal to said established minimums.
6. The inflatable packer as claimed in claim 5, wherein said tubular member includes smooth external surfaces underlying said reinforcing means.
7. A method of making an inflatable packer, which comprises the steps of:
roughening the exterior surface of a tubular mandrel intermediate the ends thereof;
covering the roughened exterior surface of the tubular mandrel with an inflatable sleeve in fric-tional contact with the roughened exterior surfaces;
and sealingly connecting the ends of the infla-table sleeve to the tubular mandrel.
roughening the exterior surface of a tubular mandrel intermediate the ends thereof;
covering the roughened exterior surface of the tubular mandrel with an inflatable sleeve in fric-tional contact with the roughened exterior surfaces;
and sealingly connecting the ends of the infla-table sleeve to the tubular mandrel.
8. The method as claimed in claim 7, including the step of:
selecting said tubular mandrel from pipe having an outside diameter and wall thickness greater than the respective minimums established for casing by the American Petroleum Institute, and wherein after said roughening step the outside diameter and wall thickness of said tubular mandrel radially within the roughened surface formed in said roughening step are at least equal to said respec-tive minimums.
selecting said tubular mandrel from pipe having an outside diameter and wall thickness greater than the respective minimums established for casing by the American Petroleum Institute, and wherein after said roughening step the outside diameter and wall thickness of said tubular mandrel radially within the roughened surface formed in said roughening step are at least equal to said respec-tive minimums.
9. The method as claimed in claim 7, wherein the roughening step includes knurling the exterior sur-face of the tubular mandrel.
10. The method as claimed in claim 7, wherein the roughening step includes the steps of:
forming a plurality of first helical grooves in the exterior surface of the tubular mandrel.
forming a plurality of first helical grooves in the exterior surface of the tubular mandrel.
11. The method as claimed in claim 10, wherein the roughening step includes the step of:
forming a plurality second helical grooves in the exterior surface of the tubular member substantially orthogonal to first helical grooves.
forming a plurality second helical grooves in the exterior surface of the tubular member substantially orthogonal to first helical grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000452083A CA1226518A (en) | 1984-04-16 | 1984-04-16 | Inflatable packer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000452083A CA1226518A (en) | 1984-04-16 | 1984-04-16 | Inflatable packer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1226518A true CA1226518A (en) | 1987-09-08 |
Family
ID=4127664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000452083A Expired CA1226518A (en) | 1984-04-16 | 1984-04-16 | Inflatable packer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1226518A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094591A (en) * | 2011-03-15 | 2011-06-15 | 东营市兆鑫工贸有限责任公司 | Fracturing packer for barefoot well |
| CN102094592A (en) * | 2011-03-15 | 2011-06-15 | 东营市兆鑫工贸有限责任公司 | Open hole well packer |
-
1984
- 1984-04-16 CA CA000452083A patent/CA1226518A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094591A (en) * | 2011-03-15 | 2011-06-15 | 东营市兆鑫工贸有限责任公司 | Fracturing packer for barefoot well |
| CN102094592A (en) * | 2011-03-15 | 2011-06-15 | 东营市兆鑫工贸有限责任公司 | Open hole well packer |
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