CA2210087A1 - Alternate-path well screen with protective shroud - Google Patents

Alternate-path well screen with protective shroud

Info

Publication number
CA2210087A1
CA2210087A1 CA 2210087 CA2210087A CA2210087A1 CA 2210087 A1 CA2210087 A1 CA 2210087A1 CA 2210087 CA2210087 CA 2210087 CA 2210087 A CA2210087 A CA 2210087A CA 2210087 A1 CA2210087 A1 CA 2210087A1
Authority
CA
Canada
Prior art keywords
alternate
body
path
length
well screen
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.)
Abandoned
Application number
CA 2210087
Other languages
French (fr)
Inventor
Lloyd Garner Jones
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ExxonMobil Oil Corp
Original Assignee
ExxonMobil Oil Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to US71992396A priority Critical
Priority to US08/719,923 priority
Application filed by ExxonMobil Oil Corp filed Critical ExxonMobil Oil Corp
Publication of CA2210087A1 publication Critical patent/CA2210087A1/en
Application status is Abandoned legal-status Critical

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02Subsoil filtering
    • E21B43/04Gravelling of wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02Subsoil filtering
    • E21B43/08Screens or liners

Abstract

An alternate-path, well screen which includes means for protecting the alternate flowpath (e.g., a plurality of conduits) on the screen during installation and operation. This means is comprised of a shroud having a plurality of radial openings in the wall thereof, which is concentrically mounted on said body and is connected at each end thereto whereby the shroud covers and protects the alternate flowpath.

Description

ALTERNAll~-PATH WELL SCREEN WITH PROTECTIVE SHROUD
The present invention relates to an alternate-path well screen having a protective shroud thereon and in one of its aspects relates to an altemate-path,s well screen of the type used in gravel-pack completions of a wellbore which has an outer shroud thereon to protect the alternate paths while the screen is beinginstalled and/or removed.
In producing hydrocarbons or the like from loosely or unconsolid~ted and/or fractured for",dtions, it is not unco"~,o" to produce large volumes of 10 particulate material along with the for~ation fluids. As is well known in the art, these partiuJ'~tes routinely cause a variety of problems and must be controlled in order for production to be economical. rrobably the most pop~ technique used for controlling the production of particulates (e.g.. sand) from a well is one which is cGmr"only known as Ugravel packing".
In a typical gravel pack completion, a screen is lowered into the wellbore on a workstring and is positioned adjacent the subter,dnean for")ation to be completed; e.g. a production formation. Particulate material, collectively refe"ed to as Ugravel~, and a carrier fluid is then pumped as a slurry down the workstring where it exits through a Ucross-over" into the well annulus for",ed between the screen and the well casing or open hole, s the case may be. The carrier liquid in the slurry normally flows into the fo""dlion and/or through the screen, itself, which, in turn, is sized to prevent flow of gravel ll ,erethrough.
This results in the gravel being deposiled or Uscreened outJ in the well annuluswhere it collects to form a gravel pack around the screen. The gravel, in tum, is sized so that it forms a permeable mass which allows flow of the produced fluidsll,eretl,rough and into the screen while blocking the flow of the partiaJI-'es prod~ ~cecl with the produ~tion fluids.
One of the major problems ~ssoci~ted with gravel packing, especially where long or inclined intervals are to be completed, arises from the difficulty in distributing the gravel over the entire completion interval; i.e. completely packing the entire length of the well annulus around the screen. This poor distribution of gravel (i.e. incomplete packing of the interval) is often caused by the carrier liquid in the gravel slurry being lost into the more permeable pGI liGnS
of the for",dtion which in turn ~ ~ses the gravel to form Usand bridgesn in the annulus before all of the gravel has been placed. Such bridges block further flow of slurry through the annulus which prevents the placement of sufficient gravel (a) below the bridge in top-to-bottom packing operations or )b) above thebridge in bottom-to-top packing operations.
To alleviate this problem Ualler,,ale-path~ well screens have been developed which provide for good distribution of gravel throughout the entire c~lllpletiGn interval even if sand bridges form before all of the gravel has been placed. For exar"plcs of such sueens see US Patents 4 945 991: 5 082 052:
5 113 935: 5 417 284; and 5 419 394. In these well screel ~s the aller"ale-paths (e.g.. pel roraled shunts or by-pass conduits) extend along the length of the sueen and are in fluid communication with the gravel slurry as the slurry enters the well annulus around the sueen. If a sand bridge forms in the annulus the slurry is still free to flow through the conduits and out into the annulus through the pe, rordlions in the conduits to complete the filling of theannulus above and/or below the sand bridge.
Due to the relative small size of the altemate-paths it is vitally important that they are not crilllped or otherwise dal"aged during the installation of thescreen. One proposal for prot~ting these conduits is to place them inside the outer surface of the sc~en: see US ratenls 5 476 143 and 5 515 915.
However this type of construction may slJbstanlially increase the cost of the screen over the cost of those screens now col"h,er~ially-available. Accordingly it appears more desirable at least from an ec~nomic slandpoint to position and 2S secure the by-pass conduits onto the eAle" ,al surface of several of many typical exisling commercially-available well screens. However of course this will ~pose the conduits to dal"age during installation of the screen.
The present invention provides an alle,.,dte-path well sueen which includes a shroud which protects the alle" ,ale flowpath on the sueen during insPIl~tion and operation. More particularly the present screen is co"",rised ofan elongaled cylindrical body which has a permeable section (e.g.. a screen .

section) therein. At least one alternate flowpath (e.g.. a plurality of conduits) is mounted on said body and extends along the length thereof. Each of said conduits have a plurality of openings sp~ced along its length through which a gravel slurry can be delivered to dirrerent levels within the well annulus around s the sueen when the screen is in an operable position within a wellbore.
A cylindrical shroud having a plurality of openings in the wall thereof is CGI ,cent, ically mounted on said body and is co"nected at each end ll ,ereto whereby the shroud covers and pn~le~ts the alternate flowpath during installation and operation.
BRIEF DESCRIPTION OF THE DRAWINGS
The actual construction operation and the apparent advantages of the present invention will be better understoGcl by refen i"g to the drawings in which like numerals identify like parts and in which:
FIG. 1 is an elevational view partly in section of the alternate-path well lS saeen having a protective shroud in accordance with the present invention: and FIG. 2 is a cross-sectional view of the well screen of FIG. 1 taken along line 2-2 of FIG. 1.
BEST KNOWN MODE FOR CARRYING OUT THE INVENTION
Refellin~ more particularly to the ~J~av.ings FIG. 1 illl.slfates the lower end of a producing and/or injection well 10. Well 10 has a wellbore 11 which e.~tends from the surface (not shown) through an uncGnsolidated and/or fractured production and/or injection for",dtion 10. As shown wellbore 11 is cased with casing 13 and ce",ent 14 which have pe,rorations 15 tl,erell)rough 2S to est~hlish fluid communication between fo""dtion 12 and the interior of casing 13. While well 10 is illu~l.dled as a sl~hst~rltially vertical cased well it should be recognized that the present invention is equally usable in open-hole and/or unde"ea,ned completions as well as in hori~ontal and/or inclined wellbores.
Aller"ate-path well screen 20 of the present invention is shown positioned within wellbore 11 ~ cent the completion interval of formation 12 and forms an annulus 19 between the screen and the casing 13. As shown weil screen 20 is comprised of an elongated, cylindrical body 21 which includes a permeable Uscreen'' section 22. The term Uscreen'' is used generically herein and is meant to include and cover all types of those structures collllllollly used by the industry in gravel pack operations which permit flow of fluids ll,eretl,rough while blocking the flow of particulates (e.g.. co"""ercially-available screens, slotted pipes, prepacked screens and/or liners, or combinations thereofl. Screen 20 may be of one continuous length or it may consist of sedions (e.g.. 30-foot sections) connected by subs or blanks as will be understood in the art.
Allernate flowpaths (e.g.. shunts means) are mounted on the exler-,al surface of screen 20. As shown in FIGS 1 and 2, shunt means are comprised of at least one (four shown) perforated conduits 25 which extend longitudinally along the external surface of screen 20. Each conduit 25 has a plurality of openings 26 positioned along its length and is open at either or both ends to receive gravel slurry or all conduits can be manifolded together (not shown) andfluidly connected to outlets 28 in cross-over 22 to receive gravel slurry during a gravel pack o~erdliul ,. The construction of screen 20 to this point is basically the same as that of known prior art alternate-path screens. Unfortunately, however, by positioning by-pass conduits 25 on the exterior of screen 20, the conduits are vulnerable to damage as the screen is installed into wellbore 11.
In accordance with the present invention, a protective shroud 30 is positioned onto screen 20 over conduits 25. Shroud 30 is comprised of a cylinder made of a strong, durable material, e.g.. steel, which is secured at its upper and lower ends to the body of the sueen by welding or the like. The shroud 30 has a plurality of openings 31 (only some of which are numbered in the figures) through the wall ll ,ereof. By positioning the rigid shroud over the conduits 26, the conduits are protected from any accidental blows or the like during the assel,lbly and installation of the screen which might otherwise severely damage or destroy the conduits for their intended purpose.
In operation, alternate-path screen 20 with protective shroud 30 in place is lowered intowell bore 11 and is positioned ~5~cenlfûr,,,dlion 12. Packer29 is set as will be understood in the art. Gravel slurry is then pumped down the workstring and through outlet ports 28 in cross-over 22 into annulus 19. As the slurry loses fluid to the formation and/or through screen 20, gravel from the slurry is deposited in the annulus to form a gravel pack around the screen as will be unders~ood in the art.
If excessive liquid is lost from the slurry before the annulus is filled with gravel, a sand bridge (dotted lines 32 in FIG. 1 ) is likely to form which will block further flow of gravel through the annulus and prevent further filling of the annulus below the bridge. If and when this happens, the gravel slurry is still 10 free to flow through conduits 25 and out openings 26 therein and then exit through openings 31 in shroud 30 into annulus 19 to by pass bridge 19 and finish filling the annulus. Again, shroud 30 protects conduits 25 both during the installation of screen 20 and the placement of the gravel pack around the screen.

Claims (8)

1. An alternate-path well screen comprising:
an elongated body having a permeable section therein;
at least one alternate flowpath extending along the length of said body; and a shroud surrounding body and covering said alternate flowpath to protect said alternate flowpath during installation and operation.
2. The alternate-path, well screen of claim 1 wherein said shroud is comprised of a cylinder positioned concentrically over said body and said at least one alternate flowpath and connected to said body.
3. The alternate-path, well screen of claim 2 wherein said cylinder has a plurality of openings in the wall thereof.
4. The alternate-path, well screen of claim 1 wherein said at least one alternate flowpath comprises:
a conduit mounted on said body and extending along the length thereof, said conduit having a plurality of openings spaced along its length.
5. The alternate-path, well screen of claim 1 wherein said at least one alternate flowpath comprises:
a plurality of conduits mounted on said body and extending along the length thereof, each of said conduit having a plurality of openings spaced along its length.
6. An alternate-path, well screen comprising:
a elongated body having a permeable section therein;
at least one alternate flowpath extending along the length of said body; and a cylindrical shroud having a plurality of radial openings in the wall thereof, said shroud being concentrically mounted on said body and connected at each end to said body thereby covering said alternate flowpath to thereby protect said alternate flowpath during installation and operation.
7. The alternate-path, well screen of claim 6 wherein said at least one alternate flowpath comprises:
a conduit mounted on said body and extending along the length thereof, said conduit having a plurality of openings spaced along its length.
8. The alternate-path, well screen of claim 6 wherein said at least one alternate flowpath comprises:
a plurality of conduits mounted on said body and extending along the length thereof, each of said conduit having a plurality of openings spaced along its length.
CA 2210087 1996-09-25 1997-07-09 Alternate-path well screen with protective shroud Abandoned CA2210087A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US71992396A true 1996-09-25 1996-09-25
US08/719,923 1996-09-25

Publications (1)

Publication Number Publication Date
CA2210087A1 true CA2210087A1 (en) 1998-03-25

Family

ID=24891929

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2210087 Abandoned CA2210087A1 (en) 1996-09-25 1997-07-09 Alternate-path well screen with protective shroud

Country Status (7)

Country Link
AR (1) AR009495A1 (en)
CA (1) CA2210087A1 (en)
DE (1) DE19742363A1 (en)
GB (1) GB2317630A (en)
NL (1) NL1007108C2 (en)
NO (1) NO974420L (en)
RU (1) RU2141028C1 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0909875A3 (en) 1997-10-16 1999-10-27 Halliburton Energy Services, Inc. Method of completing well in unconsolidated subterranean zone
US6427775B1 (en) 1997-10-16 2002-08-06 Halliburton Energy Services, Inc. Methods and apparatus for completing wells in unconsolidated subterranean zones
US6003600A (en) * 1997-10-16 1999-12-21 Halliburton Energy Services, Inc. Methods of completing wells in unconsolidated subterranean zones
US6481494B1 (en) 1997-10-16 2002-11-19 Halliburton Energy Services, Inc. Method and apparatus for frac/gravel packs
US6230803B1 (en) 1998-12-03 2001-05-15 Baker Hughes Incorporated Apparatus and method for treating and gravel-packing closely spaced zones
AU3343700A (en) 2000-01-05 2001-07-16 Baker Hughes Incorporated Apparatus and method for treating and gravel-packing closely spaced zones
US6799637B2 (en) 2000-10-20 2004-10-05 Schlumberger Technology Corporation Expandable tubing and method
US6681854B2 (en) * 2000-11-03 2004-01-27 Schlumberger Technology Corp. Sand screen with communication line conduit
GB2382831B (en) * 2000-11-03 2003-08-13 Schlumberger Holdings Sand screen with communication line conduit
NO335594B1 (en) 2001-01-16 2015-01-12 Halliburton Energy Serv Inc Expandable devices and methods for these
US6932156B2 (en) 2002-06-21 2005-08-23 Baker Hughes Incorporated Method for selectively treating two producing intervals in a single trip
US6776236B1 (en) 2002-10-16 2004-08-17 Halliburton Energy Services, Inc. Methods of completing wells in unconsolidated formations

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5341880A (en) * 1993-07-16 1994-08-30 Halliburton Company Sand screen structure with quick connection section joints therein
US5476143A (en) * 1994-04-28 1995-12-19 Nagaoka International Corporation Well screen having slurry flow paths
US5515915A (en) * 1995-04-10 1996-05-14 Mobil Oil Corporation Well screen having internal shunt tubes

Also Published As

Publication number Publication date
NO974420D0 (en) 1997-09-24
RU2141028C1 (en) 1999-11-10
AR009495A1 (en) 2000-04-26
NL1007108C2 (en) 1998-07-27
GB2317630A (en) 1998-04-01
NO974420L (en) 1998-03-26
DE19742363A1 (en) 1998-03-26
GB9717772D0 (en) 1997-10-29
NL1007108A1 (en) 1998-03-26

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Legal Events

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