CA2006931C - Arrangement for patching off troublesome zones in a well - Google Patents

Arrangement for patching off troublesome zones in a well

Info

Publication number
CA2006931C
CA2006931C CA002006931A CA2006931A CA2006931C CA 2006931 C CA2006931 C CA 2006931C CA 002006931 A CA002006931 A CA 002006931A CA 2006931 A CA2006931 A CA 2006931A CA 2006931 C CA2006931 C CA 2006931C
Authority
CA
Canada
Prior art keywords
string
arrangement
profile pipes
pipes
profile
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 - Lifetime
Application number
CA002006931A
Other languages
French (fr)
Inventor
Gabdrashit Sultanovich Abdrakhmanov
Rashid Akhmedullovich Uteshev
Rustam Khamitovich Ibatullin
Izil Galimzyanovich Jusupov
Anatoly Vasilievich Perov
Albert Gabidullovich Zainullin
Konstantin Viktorovich Meling
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.)
TATARSKY GOSUDARSTVENNY NAUCHNO-ISSLEDOVATELSKY I PROEKTNY INSTITUT NEFTYANOI PROMYSHLENNOSTI
Original Assignee
TATARSKY GOSUDARSTVENNY NAUCHNO-ISSLEDOVATELSKY I PROEKTNY INSTITUT NEFTYANOI PROMYSHLENNOSTI
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 US07/555,503 priority Critical patent/US5083608A/en
Priority to EP89902698A priority patent/EP0397874B1/en
Priority to AU31883/89A priority patent/AU623123C/en
Priority to PCT/SU1988/000237 priority patent/WO1990005833A1/en
Application filed by TATARSKY GOSUDARSTVENNY NAUCHNO-ISSLEDOVATELSKY I PROEKTNY INSTITUT NEFTYANOI PROMYSHLENNOSTI filed Critical TATARSKY GOSUDARSTVENNY NAUCHNO-ISSLEDOVATELSKY I PROEKTNY INSTITUT NEFTYANOI PROMYSHLENNOSTI
Priority to CA002006931A priority patent/CA2006931C/en
Application granted granted Critical
Publication of CA2006931C publication Critical patent/CA2006931C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/10—Setting of casings, screens, liners or the like in wells
    • E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
    • E21B43/105—Expanding tools specially adapted therefor

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)

Abstract

The arrangement for patching off troublesome zones in a well comprises a string of profile pipes with cylindrical portions at its ends, and a device for set-ting the string of profile pipes in a well, mounted for longitudinal reciprocation inside the string of profile pipes.
Said device includes a reamer of the cylindrical portions of the profile pipes, positionable inside the uppermost cylindrical portion of the string of profile pipes rigidly connected with an expander positionable above the string of profile pipes and having a housing with expanding elements mounted thereon.

Description

200~93~

ARRAN~EMENT ~OR PATCHING OFF ~ROUBLESOME ZONES
IN A WELL
The present in~ention relates to well-drilling equip-me~t, and more particularly it relates to au arra~ge-ment ~or isolati~g cr patching o~f trDublesc~e zD~es in a well.
The prese~t i~ve~tion ca~ be emplD~ed tD the ut-most effQct ior patching off trDubleso~e ZO~e9 in tbe well drilli~g process, caused by intensQ lo~s of cir-culstion o~ the drilling mud and ce~e~t slurry, by i~-flo~ ~ 8 liquid or gas irom an exposQd for~ation a~d on accou~t of caving-in or crubmling oi tbe rock being drilled.
- At present, it bas become ever mDre frequentl~
~ecessary tD drill deQp ~ells for Dil and gas prD~uc-tions, snd more often than nDt a drilling Dperatioh encounters for~ations ~hich are i~compatible ~rom the drilli~g vie~pDint? i.e. have abnormally high and 1D~
formatio~ pressures. To prDvide for further drilling Df a ~811~ prior to exposi~g every successive trDuble-so~e iDrmatiDn, the previously drilled part o~ the ~ell i9 cased~ ith a casing string which is sub-seque~tly cemented, and the drilling is resumed ~ith bits of a smallar diaLeter. The more for~ations incompa-tible bg the drilling conditiD~s are encou~tered, the mDre casing strisgs sre-required. Thus, i~ Drder tD
ensure the re~uired inner diameter of the flo~ stri~g, it i9 neCeS9ar~ tD start drilli~g at un overly large ,., : ~
2(~0~93i diameter, which incurs a high energy input intDthe drilli~
operstion, excessive a~ounts of casings, cement, labour and ti~e, with the penetration rate slDwed down and-the drilling operatiDn beco~ing significantly ~ore costl~.
There is knDwn an arrangement iDr patching off troublesome zDnes in a well, comprising a casing string whDse lowermost part i9 provided ~ith a shDe and the uppermost part is provided ~ith a pac~er (~.S.Vinarski, "Sovremennye method~ bDrby 9 Dslozhneniyami pri burenii ne~tyanykh skvazhin v Tatarii"/Present-Day ~ethDds of Figh-ting TrDubles in Drilling Oil Wells in the Tzrtar ~epub-1ic/, 1959, Tatarskoye KnizhnDye Izdatel'stvD /Kazan/, pp.78-80.
A dra~bac~ of this arrangement is that its satting cDnsiderabl~ reduces the hDle diameter, invDlving the necessity Df starting a well with bits Df an overl~ large diameter, to be subseque~tly decreased in successive steps.
Another shDrtcDming of the ~nown arrangement is the necessity of cementing it in a ~ell, ~hich incurs excessi-ve inputs Df ti~e, cement and electric pDwer.
~ here is further known an arrange~ent fDr patchingD~f troublesD~e zones in wells (SU, A, 907220), cDmpri-sing a string Df profile pipes ~ith cylindrical portions at their ends, the lowernost end carrying a valve shDe, and the uppermost end having an assembly ~or joining tha prD_ file pipe string to the drill pipes..
The major shortcDming of this knDwn arrangement is tbat it fails to ensure sufficiently reliable isDla-tiDn Or the for~ation Dn account of inadequate sealing Df the gap between the arrsngement and the bDrehole wall, 200~93i and Or the jDintS bet~een the profile pipes th~mselves.
Moreover, if aress of caving-in are present above the zone where the arrangement is set, the rock getting into and be~ond the arrangement during the addit-ional round trip required for calibrating the patcher impairs the iormation closing-Dff process, thus impairing the reliability of tbe isolation D~ the trc~lblesome zone.
Another shortcDmi~g Df the ~nown arrang~nent is much time required fDr its setting in the well Dn account Df the necessity of perforning additional running and pulling Dperations involved in calibrating the internal passage of the arrangement, ~hich steps up the drilling c o s~ s .
It is an object o~ the present invention tD en-hance tbe reliabilit~ of patching off troublesDme zones in ~ells.
It is another object of the present inventiDn to cut the time Df setting the arrange~ent in a ~ell.
It is still another object o~ the present inve~-tion t~ render the process of patching-off troubleso~e zones in a well less costl~.
The3e and other objects are attained by an arran-gement ~or patching off troublesone zo~es in a ~ell?
comprising a string of pro~ile pipes ~ith cylindrical portions at their ends, the lowermost end portion car-rying a vslve shoe, ~hich arrs~gement, in accordance with the present invention, is provided ~ith a device 200~93:~

fDr settin~ the profile pipe string in the ~ell, ~ounted for longitudinal reciprocation inside the string Df the profile pipes and including a reamer of the cylindrical portions of the prDfile pipes, positionable in the upper~ost cylindrical portion of the string oi the profile pipe9 and rigidly connected with an expan-der positionable above the string of the prDfile pipes and having a housing with expandi~g ~e~bers.
The disclose-d invention provides fDr perfor~ing the operatiohs of running ln the profile pipe string, expanding and rea~ing the profile pipes within a single round trip, which si~plifies and speeds up the process of patcbing of~ troublesome zo~es in a well and ~akes it less costly, while ~ultiplying the chances fDr suc-cess of the entire operation in the presence Df rock caving-in zones above the for~ation isolation zone.
This is attained owing to the calibration of the profile pipe string being perfor~ed right after its reaming by the fluid pressure, with no additional round trips required ~or individual running-in of the expan-der. In this situatiDn caved-in rock would not get into the spaces between the hole wall and the profile pipe strin~, ~hile the internal space of the string is re-liably isolated from the annulus, which provides ~or urging the walls of the profile pipe~ into tight en-gage~ent with the borehole walls and enhances the sealing isolation of the formation.

200~93 In a preferred embDdiment of the present inven-tion, the arrangement further co~prises packers mounted on the end portion~ of the strin~ of the profile pipes, each packer including a cylindrical pipe length with an annular externaL grDove receiving therein a sealing element, and an internal annular projection cDrrespon-ding to this groove.
This structure of the disclosed arrangement provi-des for enhancing the fluid-tightness of the aoints of the profile pipes and with respect to the annulus, thus stepping up the reliability of the patching-Dff of tr3ublesome zones in wells.
It is expedient that the reamer should have an external shoulder adapted to engage the internal annular projection of the cylindrical pipe length of the upper-most packer.
This structural feature of tha disclosed arrange-ment provides for combining its component units into a rational assembly.
It is further expedient that the housing of the expander should have support stagas arranged at an angle to the lDngitudinal geometric axis of the housing and jointly defining a truncated pyramid having its imaginary apex belonging to said axi~ and facing the tail end of the expander, the suppDrting stages having the expanding elenents mounted thereon.
This allows to step up the permissible working load of the expanding ele~ents of the expander owing to the reduced load of their bearings, which enhances ., ,. ~ , 200~93:~

the operability of the expander and speeds up the operation of calibrating the prDfile pipe string bei set in a formation isolating zone in a well. This, in its turn, steps up the labour productivity in set-ting the entire arrangement in a well and improves the rsliability of the patching-off of a formation.
According to one embodiment of the present in-vention, each expanding element of the expander is shaped as a truncated spherical segment.
This provides for prolonging the serviceability of the expander by reducing the friction between the expanding elements and the internal wall of the profile pipes in the course of their calibration.
In one embodiment of the present invention, the string of the profile pipes is provided with annular seals received between the matching surfaces of the prDfile pipes.
This structural feature of the disclosed arrange-ment enhances still further the fluid-tightness of the joints of the profile pipes, and, hence, the reliability of the patching-off of troublesome zones in wells.
It is quite expedient tD have at least one packer mounted between the adjacent pipes in the string of the prD~ile pipes.
This version of the disclosed arrangement is inten-ded for cases when the z~ne to be patched off includes several fDrmations with different formation pressures, , .......................................................................... .

200693~

to preclude fluid overflows between the ~ormations which may be essential for meeting the ecolDgical standards.
Other objects and sdvantages of the present in-vention will be made apparent in the ~ollowing descrip-tion of it 8 embodiment in an arrangement for patching off troublesome zones in a well, with reference being made to the accompanying drawings, wherein:
FIG. 1 is the upper part of an arrangement embodyi~
the invention;
- FIG. 2 is the lower part of the arrangement embo-dying the invention;
FIG. 3 is a section taken on line III-III of FIG. 2;
FIG. 4 is a section taken on line IV-IV of FIG. 2;
~IG. 5 shows a joint A of FIG. 2.
FIG. 6 shows the same joint after the calibration of the profile pipes;
FIG. 7 shows the structure of one section of the expander; and FIG. 8 is a sectional view taken on line ~III-VIII
of FIG. 7 .
The disclosed arrangement for p~tc~ing off troub-lesome zones in a well comprises a string of profile pipes 1 (which may be ultimately a single profile pipe) (FIGS 1 and 3) provided at their ends with cylindrical portions 2 which are alternatingly provided with ex-ternal threads 3 and internal threads 4 for joinining the pipes 1 to one another and to other compDnents of 2(~0~9 the disclosed arrangement, as it can be seen in FIGS 2, 5 and ~. ~he cylindrical portions 2 o~ the uppermost and lowermost profile pipes 1 are provided with packers 4' (FIGS 1, 2, 4), each packer 4' including a cylindrical pipe length 5 with an annular external groove 6 receiving therein a sealing element 7, the internal walls o~ the pipe lengths 5 having respective annular projections 8 corresponding to the grooves 6.
The lowermost cylindrical portion 2 of the string of the profile pipes 1 accommodates a shoe 9 (FIG. 2) attached to the respective pipe length 5 and prDvided with a ball-type valve member 10 for closing the flow passage 11, and a lock pin 12 limiting the displacement of the valve member 10 in the shoe 9.
The upper cylindrical portion 2 of tbe string of the pro~ile pipes 1 (FIG. 1) has an inner space 13 com-municating with the inner space of the respective pipe length 5 of the packer 4', accommodating therein a reamer 14 provided with an external annular shoulder 15 adapted to engage the internal annular projection 8 o~ the pipe length 5, thus supporting the string o~ the profile pipes 1 in a suspended state. ~he reamer 14 is provided with reaming elements 16 mDunted externally on its central portiDn, a tip 17 with a slot 18 adapted to engage the lock pin 12 of the shoe 9, and a seal 19 carried by the annular shoulder 15 of the reamer 14. A similar seal 19' is provided in the joint o~ the shoe 9 with tbe respective pipe length 5.

200~93:~

A sub 20 rigidly connects the reamer 14 with an expander 20' including several successively joined sec-tions 21, 22 and 23, each one D~ them having a hou-sing 24 (FIG. 7) with threads 25 and 26 at its respective ends, its central portion carrying, with the aid of ar-bors 27 and washers 28 (FIGS 7 and 8), the expanding elements 29 shaped each as a truncated spherical seg-ment. To accommodate the expanding elements 29, the housing 24 of the expander 20' has made thereon in its central portion a plurality (e.g. three) of supporting stages or flats 30 arranged at an acute angle with respect to its longitudinal geometric axis, and jointl~
defining a truncated pyramic whose imaginary apex belongs to this longitudinal axi~, while faci~g the tail end 21 of the expander 20'.
~ he expanding elements 29 o~ the respective succes-sive sections 21, 22 and 23 of the expander 20' have their respective working diameters diminishing stepwise in the expanding (downward) direction.
The threaded joints 3, 4 (FIGS 5 and 6) of the pro-file pipes 1 are provided with annular seals 31 accom-modated in a gap defined by an annular groove 32 at the end of the internal thread 4 and a tapering (bevelled) end`portion 33 of the external thread 3 o~ the res-pective cylindrical portions 2 of the profile pipes 1.
The-entire arrangement assembled as illustrated in FIGS 1 and 2 is attached by the internal thread 25 200~i9~

Df the end section 21 Df the expander 20' to the lower-most end of the drill pipe string (not shown) and run into the well to a tr~ublesome zone, the pressure of the borehole fluid opening bhe ball-type valve member 10 with the fluid flowing via the flow passage 11 into the string of the profile pipes 1 and drill pipes (not sbown). Then the appropriate fluid is pumped from the surface into these pipe strings to build up therein the sufficient pressure (with the ball valve member 10 au-tDmatically closing) for straightening the profile pi-pes 1 and thus for urging them into tight engagement with the wall of the boreholeO
Then the drill pipe string (not shown) is rotated with an axial load applied to it to be trans~itted to the reamer 14, for its reaming elements 16 to expand the threaded joints 3, 4 (FIGS 1 and 6) of the profile pipes 1 and also bo ultimately straighten them. While perfor-ming this, the reaming elements 16 of the reamer 14 press the tapering end 33 of the thread 3 of each res-pective cylindrical portion 2 of the profile pipe 1 into the annular groove 32 at the end of the inner thread 4 of the respective other cylindrical portion 2 of the matching profil~ pip~ 1, 90 that the annular seal 31 is deformed to ensure reliable joining and fluid-tight sealing of the adjacent pro~ile pipes 1. At the same time, the inner passage diame~er of the cylindrical portions 2 of the profil2 pipes 1 is increased to provide for unobstructed progress of tbe annular shoulder 15 of .....

2()0~i93~

the reamer 14 with its seal 19 through these portions 2.
The subsequent expa~sion of the passage diameter of the threaded joints 3, 4 of the profile pipes 1, the calibration o~ their internal diameter and strength-enhancing burnishing of their walls is performed by the successive sections 23, 22 and 21 of the expander 20', which, owing to their working diameters growing in successive steps, consistently expand the inner diameter of the profile pipes 1 to the required value.
As the expander 14 approaches the shoe 9, the slot 18 of its tip 17 engages thelock pin 12 tD rotate the shoe 9 and thus to unscrew it from the respective pipe length 5. Thus unscrewed, the shoe falls on the bottom hole, making it possible to ream and expand the lowermost cylindrical end portion 2 uf the string of the profiLe p~pes 1 by the reaming elements 16 Df the reamer 14 and by the expanding elements 29 o~ the expander 20'. Tbis ends the job of patching off the troublesome zone with the string of the pro~ile pipes 1, and the drilling operation is continued.
Should the troublesome zone in the well-drilling operation span several formations with different forma-tion pressures, there wDuld arise tbe necessity of ad-ditionally separating (isolating) these formatiDns ~rom one another, to predluce fluid overflows between them.
In this case the disclosed arrangement is provided with r , . ~ .

2(~0~9~:~

additional intermediate packers 4' whicb are set in the string of tbe profile pipes 1 between thDse Df them that correspDnd tD the interva1s tD be separated.
By using replsceable reaming elements 16 and expan-ding elements 29, respectively, in the reamer 14 and expander 20', the disclDsed arrangement can be used repeatedly to bring down the drilling Dperation cost.

. ~ . . .

Claims (7)

1. An arrangement for patching off troublesome zones in a well, comprising:
a string of profile pipes having cylindrical portions at the ends thereof, including the uppermost and lowermost end portions, said lowermost end portion of said string of profile pipes accommodating a shoe;
a device for setting said string of profile pipes in a well, mounted for longitudinal reciprocation inside said string of profile pipes, said device including a reamer of said cylindrical portions of said string of profile pipes, positionable inside said uppermost cylindrical portion of said string of profile pipes, and rigidly connected with an expander positionable above said string of profile pipes and having a housing with expanding elements mounted thereon.
2. An arrangement as claimed in claim 1, provided with packer mounted at the ends of said string of pro-file pipes, each said packer including a cylindrical pipe length with an external annular groove receiving therein a sealing element, and an internal annular pro-jection corresponding to said groove.
3. An arrangement as claimed in claim 2, wherein said reamer has an annular shoulder adapted to engage said internal annular projection of said cylindrical pipe length of the uppermost one of said packers.
4. An arrangement as claimed in claim 1, wherein said housing of said expander has support stages arranged at an angle to the longitudinal geometric axis of said housing, jointly defining a truncated pyramid whose imaginary apex belongs to said axis, facing the tail end of said expander, said expanding elements being moun-ted on said support stages,
5. An arrangement as claimed in claim 4, wherein each said expanding element is shaped as a truncated spherical segment.
6. An arrangement as claimed in claim 1, wherein said string of profile pipes includes annular seals received between the respective matching surfaces of said profile pipes of said string.
7. An arrangement as claimed in claim 2, comprising at least one additional packer positioned between the adjacent ones of said profile pipes of said string.
CA002006931A 1988-11-22 1989-12-29 Arrangement for patching off troublesome zones in a well Expired - Lifetime CA2006931C (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US07/555,503 US5083608A (en) 1988-11-22 1988-11-22 Arrangement for patching off troublesome zones in a well
EP89902698A EP0397874B1 (en) 1988-11-22 1988-11-22 Device for closing off a complication zone in a well
AU31883/89A AU623123C (en) 1988-11-22 Device for closing off a complication zone in a well
PCT/SU1988/000237 WO1990005833A1 (en) 1988-11-22 1988-11-22 Device for closing off a complication zone in a well
CA002006931A CA2006931C (en) 1988-11-22 1989-12-29 Arrangement for patching off troublesome zones in a well

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/SU1988/000237 WO1990005833A1 (en) 1988-11-22 1988-11-22 Device for closing off a complication zone in a well
CA002006931A CA2006931C (en) 1988-11-22 1989-12-29 Arrangement for patching off troublesome zones in a well

Publications (1)

Publication Number Publication Date
CA2006931C true CA2006931C (en) 1995-10-24

Family

ID=25673855

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002006931A Expired - Lifetime CA2006931C (en) 1988-11-22 1989-12-29 Arrangement for patching off troublesome zones in a well

Country Status (4)

Country Link
US (1) US5083608A (en)
EP (1) EP0397874B1 (en)
CA (1) CA2006931C (en)
WO (1) WO1990005833A1 (en)

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EP0397874B1 (en) 1997-02-05
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EP0397874A4 (en) 1992-01-08
AU623123B2 (en) 1992-05-07
WO1990005833A1 (en) 1990-05-31
AU3188389A (en) 1990-06-12

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