EP0186317A1 - Verfahren und Vorrichtung zur Verrohrung stark abgelenkter Bohrlöcher - Google Patents

Verfahren und Vorrichtung zur Verrohrung stark abgelenkter Bohrlöcher Download PDF

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Publication number
EP0186317A1
EP0186317A1 EP85308593A EP85308593A EP0186317A1 EP 0186317 A1 EP0186317 A1 EP 0186317A1 EP 85308593 A EP85308593 A EP 85308593A EP 85308593 A EP85308593 A EP 85308593A EP 0186317 A1 EP0186317 A1 EP 0186317A1
Authority
EP
European Patent Office
Prior art keywords
casing
borehole
buoyant
pipe
section
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.)
Withdrawn
Application number
EP85308593A
Other languages
English (en)
French (fr)
Inventor
Glen Conrad Tolle
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
Mobil 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
Application filed by Mobil Oil Corp filed Critical Mobil Oil Corp
Publication of EP0186317A1 publication Critical patent/EP0186317A1/de
Withdrawn legal-status Critical Current

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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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • 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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
    • 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
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling

Definitions

  • the present invention relates to a method of placing pipe within highly-deviated boreholes.
  • the pipe tends to displace some of the drilling mud into the wall of the borehole, particularly in the more porous formations. This causes the pipe to embed itself into the filter cake formed from the solid components of the mud, to form an effective pressure seal around the embedded area.
  • the pressure difference between the fluid in the borehole and the fluid in the formation causes a force to develop across this pressure seal which pushes the pipe more strongly against the wall of the borehole. This force may cause the pipe to become "differentially pressure stuck * in the borehole.
  • a technique has now been devised for positioning pipe, e.g. casing or tubulars in a well borehole, particularly deep, highly deviated boreholes, which minimizes the problems caused by contact of the pipe with the walls of the deviated portion of the borehole.
  • the technique eliminates the tendency possessed by fluid-buoyed casing to twist during running. Because the frictional drag resulting from -sinking, floating and twisting of the casing is minimized, the potential for successful placement of the casing is substantially improved when highly deviated wellbores are being cased or tubulars placed within the hole.
  • the pipe is placed in the borehole with the use of a buoyant, solid insert within at least the lower portion of the pipe.
  • the insert may be hollow or solid in configuration and may be fabricated of materials which will give the desired degree of buoyancy to the pipe; foamed and unfoamed plastic resins such as foamed polystyrene, polyethylene, polypropylene and wood/resin composites will be suitable.
  • deviated boreholes are drilled with the initial portion of the hole near the surface with a vertical axis and with a progressively increasing deviation from the vertical beginning on or at some distance beneath the surface.
  • Directional drilling techniques using equipment components such as permanent and removable whipstocks, knuckle joints and spudding bits are conventionally used in directional drilling although it may also be accomplished through control of the weight on the bit or by the use of mud control, special bits and various specialized rotation speeds or drill assemblies.
  • casing is run into the hole by making up the casing string on the derrick at the surface, after which the string is lowered into the hole and forced downwards by the weight of the casing which is progressively added at the surface.
  • the weight of the casing which still acts in a vertically downward direction, tends to become transferred to the bottom wall of the borehole unless it is counteracted by applying an upward, buoyant force to the casing.
  • Figure 1 shows a simplified section of fluid-filled casing string 10 as it is passing through the deviated portion of the borehole 11, which is filled with drilling fluid or drilling mud 12.
  • the casing string comprises individual lengths of casing 13 connected serially together by means of casing couplings 14, e.g. threaded couplings.
  • the weight of the casing is evenly distributed over its length and accordingly, the force due to casing weight is also evenly distributed along the length of each section 13 of casing.
  • the liquid 15 within the casing, retained by means of plugs 16 will exert a downward force by reason of its weight with the resultant force at the lower end of the section of casing, where the liquid is.
  • the upper portion of the section of casing will, however, be subject to an upward buoyant force resulting from gas 17 which is contained in this section of the casing (the downward force of the weight of the gas is negligible).
  • the forces which are created by the use of the liquid and the gas are therefore not evenly distributed, but rather are concentrated, with a net downward force at the lower end of the fluid-filled casing section and a net upward force at the upper end of the fluid-filled section.
  • This couple causes the casing to twist about a transverse, horizontal axis running sideways through the fluid-filled section, with the result that the lower portion of the casing wi,ll tend to come into contact with the bottom wall of the borehole and the upper portion into contact with the upper wall of the borehole. This will create undesirable frictional drag as well as the potential for differential pressure sticking at both ends of the casing section.
  • the lower section of casing which is to be positioned in the deviated portion of the borehole incorporates a buoyant, solid insert which distributes the buoyant forces evenly along the length of the section of casing which contains it.
  • Figure 2 shows a section of the casing in the deviated portion of the borehole with such an insert.
  • Casing string 20 within deviated borehole 11 filled with drilling mud 12 is made up of a number of lengths of casing 21 joined together by means of casing joints 22 has an annular, solid insert 23 which is held between retaining rings 24 and 25 at its upper and lower ends, respectively.
  • the retaining rings may be fixed to the casing by welding, screws or other suitable means.
  • the insert- is fabricated from a material which will provide the desired degree of positive buoyancy to the casing when it is run open-ended into the mud-filled borehole. Accordingly, the insert will be fabricated of a suitably buoyant material and dimensioned so that the net buoyant force is of the desired magnitude. Thus, if a relatively more buoyant material is used, the insert may be of thinner annular section than if a relatively less buoyant material is used.
  • Suitable materials for making the insert include foamed and unfoamed plastic resin materials such as foamed polystyrene and foamed polyethylene, polyurethane foam, unfoamed polyethylene or polypropylene or other plastic resin materials, low density solids such as wood, cork, reconstituted wood, e.g., composites of wood chips or sawdust bonded by means of resin adhesives, reconstituted cork and other materials of a density which is below that of the drilling mud in use.
  • foamed and unfoamed plastic resin materials such as foamed polystyrene and foamed polyethylene, polyurethane foam, unfoamed polyethylene or polypropylene or other plastic resin materials, low density solids such as wood, cork, reconstituted wood, e.g., composites of wood chips or sawdust bonded by means of resin adhesives, reconstituted cork and other materials of a density which is below that of the drilling mud in use.
  • the range of suitable insert materials
  • a preferred material is syntactic foam which is commercially available for use on marine risers and other oilfield applications; this material has high foam strength and may be molded into different configurations.
  • a typical syntactic foam is available from W.R. Grace & Co.. under the trademark Eccofloat, with different grades having densities of about 320-450 kg. m. -3 (20- 28 lbs . ft. 3).
  • the downward force resulting from the weight of the casing and the insert is evenly distributed along the length of the section of casing, as is the upward force arising from the buoyant effect of the insert.
  • the section of casing is not only held in a state of neutral buoyancy but also has a minimal tendency to twist about the transverse horizontal axis through its center. Because of this, the risk that the casing will come into contact with the walls of the borehole is reduced and positioning of the casing in the borehole is facilitated.
  • the casing string is made up at the surface using the derrick in a conventional manner.
  • the lower sections of casing which are to enter the deviated portion of the borehole are provided with the buoyant inserts to minimize running problems.
  • the casing is left open at its lower end so that as it descends into the hole, the mud enters the casing to provide the desired degree of buoyancy.
  • the composition and size of the inserts will be suitably determined and the inserts secured within each section of casing as described above.
  • the casing is then run into the mud-filled borehole in the normal manner until all the buoyant sections are beneath the surface.
  • Non-buoyant sections of casing can then be made up into the top portion of the string and, if necessary, additional weight for driving the string down into the borehole may be provided by using heavy weight casing or by filling the upper portion of the casing with a weighting fluid.
  • a plug may suitably be placed at the bottom of the section which is to contain weighting fluid in order to retain the fluid.
  • the cement may be circulated down through the casing string and up into the annulus without interference, but if the inserts are likely to interfere with the cementing operation or with the setting of subsequent casing or tubular strings, the inserts may be readily drilled out using conventional techniques, e.g. with a wire brush.
  • Appropriate shoes at the end of the casing string e.g., guideshoes, may be provided in order to facilitate running of the casing and the subsequent cementing operations although, of course, these shoes should permit the mud to enter the casing as it is floated down the borehole in a running operation of this type, in order to provide the desired degree of buoyancy.
  • the pipe may be desirable to run the pipe into the borehole with a closed bottom end so that the mud in the borehole is excluded from the interior of the pipe.
  • This may be desirable, for instance, in running tubulars or relatively heavy weight casing when the buoyant effect of the gas retained within the casing is desired but some additional weight is needed to provide neutral buoyancy. In such cases, the solid insert may provide sufficient additional weight to the pipe.
  • the insert may be hollow, as described above or, alternatively, may be completely solid, especially when the pipe is to be run into the hole with a closed end.
  • a flow passage through the inserts for the mud to pass up the string should be provided and this will preferably be a central flow passage in a hollow insert, as described above.
  • the inserts may be pre-formed to the desired shape and size and then inserted into the pipe and fixed in it within retaining rings or other devices, as previously mentioned.
  • pre-formed inserts may be retained with adhesives, e.g. epoxies.
  • Another alternative is to form the insert directly in the pipe so that the pipe acts as a mold for the insert which, upon setting, becomes bonded directly to the pipe, obviating the need for adhesives or retaining devices.
  • Polyurethane foams may be used effectively in this way for forming the inserts.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (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)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
EP85308593A 1984-12-06 1985-11-27 Verfahren und Vorrichtung zur Verrohrung stark abgelenkter Bohrlöcher Withdrawn EP0186317A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US678948 1976-04-21
US67894884A 1984-12-06 1984-12-06

Publications (1)

Publication Number Publication Date
EP0186317A1 true EP0186317A1 (de) 1986-07-02

Family

ID=24724991

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85308593A Withdrawn EP0186317A1 (de) 1984-12-06 1985-11-27 Verfahren und Vorrichtung zur Verrohrung stark abgelenkter Bohrlöcher

Country Status (2)

Country Link
EP (1) EP0186317A1 (de)
NO (1) NO854878L (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0291193A1 (de) * 1987-05-13 1988-11-17 Cherrington Corporation Verfahren zum Zementieren eines Förderrohres in einem unterirdischen gekrümmten Bohrloch
GB2226583A (en) * 1988-12-30 1990-07-04 Shell Int Research Method of placing a pipe string in a borehole and pipe section for use in the method
US4986361A (en) * 1989-08-31 1991-01-22 Union Oil Company Of California Well casing flotation device and method
US5117915A (en) * 1989-08-31 1992-06-02 Union Oil Company Of California Well casing flotation device and method
US5181571A (en) * 1989-08-31 1993-01-26 Union Oil Company Of California Well casing flotation device and method
US5660239A (en) * 1989-08-31 1997-08-26 Union Oil Company Of California Drag analysis method
US6305468B1 (en) 1999-05-28 2001-10-23 Baker Hughes Incorporated Downhole screen and method of manufacture
GB2364727A (en) * 1999-05-28 2002-02-06 Baker Hughes Inc Running a screen downhole
NO20075711A (no) * 2007-11-08 2009-05-11 Flaaskjer Ove Fremgangsmåte og anordning for å forhindre fastkjøring av en rørstreng i en åpen avviksbrønn
NO327689B1 (no) * 2007-10-22 2009-09-14 Statoilhydro Asa Fremgangsmate for a installere et rorlegeme i en olje-/gassbronn og rorlegeme for gjennomforing av fremgangsmaten
WO2012067516A1 (en) * 2010-11-15 2012-05-24 Ziebel As A rod suitable for being inserted into a deviated wellbore and a method of manufacturing the same
WO2017069774A1 (en) * 2015-10-23 2017-04-27 Halliburton Energy Services, Inc. Casing string assembly with composite pre-milled window

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1746132A (en) * 1925-08-01 1930-02-04 Stokes John Creighton Drill pipe
US2118708A (en) * 1935-12-23 1938-05-24 Otho W Johnson Life preserver
US3231019A (en) * 1963-08-22 1966-01-25 Chevron Res Removal section for well casing
DE1231190B (de) * 1965-10-22 1966-12-29 Wilhelm Tenten G M B H Aus einzelnen Rohrschuessen bestehender Rohrstrang zum Verrohren von mit Fluessigkeit gefuellten Bohrloechern od. dgl.
US3526280A (en) * 1967-10-17 1970-09-01 Halliburton Co Method for flotation completion for highly deviated wells
US3572432A (en) * 1969-09-25 1971-03-23 Halliburton Co Apparatus for flotation completion for highly deviated wells
GB2088439A (en) * 1980-11-28 1982-06-09 Mobil Oil Corp Method of placing pipe into deviated boreholes
US4396211A (en) * 1981-06-10 1983-08-02 Baker International Corporation Insulating tubular conduit apparatus and method
US4484641A (en) * 1981-05-21 1984-11-27 Dismukes Newton B Tubulars for curved bore holes

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1746132A (en) * 1925-08-01 1930-02-04 Stokes John Creighton Drill pipe
US2118708A (en) * 1935-12-23 1938-05-24 Otho W Johnson Life preserver
US3231019A (en) * 1963-08-22 1966-01-25 Chevron Res Removal section for well casing
DE1231190B (de) * 1965-10-22 1966-12-29 Wilhelm Tenten G M B H Aus einzelnen Rohrschuessen bestehender Rohrstrang zum Verrohren von mit Fluessigkeit gefuellten Bohrloechern od. dgl.
US3526280A (en) * 1967-10-17 1970-09-01 Halliburton Co Method for flotation completion for highly deviated wells
US3572432A (en) * 1969-09-25 1971-03-23 Halliburton Co Apparatus for flotation completion for highly deviated wells
GB2088439A (en) * 1980-11-28 1982-06-09 Mobil Oil Corp Method of placing pipe into deviated boreholes
US4484641A (en) * 1981-05-21 1984-11-27 Dismukes Newton B Tubulars for curved bore holes
US4396211A (en) * 1981-06-10 1983-08-02 Baker International Corporation Insulating tubular conduit apparatus and method

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0291193A1 (de) * 1987-05-13 1988-11-17 Cherrington Corporation Verfahren zum Zementieren eines Förderrohres in einem unterirdischen gekrümmten Bohrloch
GB2226583A (en) * 1988-12-30 1990-07-04 Shell Int Research Method of placing a pipe string in a borehole and pipe section for use in the method
US4986361A (en) * 1989-08-31 1991-01-22 Union Oil Company Of California Well casing flotation device and method
US5117915A (en) * 1989-08-31 1992-06-02 Union Oil Company Of California Well casing flotation device and method
US5181571A (en) * 1989-08-31 1993-01-26 Union Oil Company Of California Well casing flotation device and method
US5660239A (en) * 1989-08-31 1997-08-26 Union Oil Company Of California Drag analysis method
US6305468B1 (en) 1999-05-28 2001-10-23 Baker Hughes Incorporated Downhole screen and method of manufacture
GB2350383B (en) * 1999-05-28 2001-12-19 Baker Hughes Inc Downhole screen
GB2364727A (en) * 1999-05-28 2002-02-06 Baker Hughes Inc Running a screen downhole
GB2364727B (en) * 1999-05-28 2002-07-03 Baker Hughes Inc Running a screen downhole
NO327689B1 (no) * 2007-10-22 2009-09-14 Statoilhydro Asa Fremgangsmate for a installere et rorlegeme i en olje-/gassbronn og rorlegeme for gjennomforing av fremgangsmaten
NO20075711A (no) * 2007-11-08 2009-05-11 Flaaskjer Ove Fremgangsmåte og anordning for å forhindre fastkjøring av en rørstreng i en åpen avviksbrønn
WO2012067516A1 (en) * 2010-11-15 2012-05-24 Ziebel As A rod suitable for being inserted into a deviated wellbore and a method of manufacturing the same
WO2017069774A1 (en) * 2015-10-23 2017-04-27 Halliburton Energy Services, Inc. Casing string assembly with composite pre-milled window
US10605013B2 (en) 2015-10-23 2020-03-31 Halliburton Energy Services, Inc. Casing string assembly with composite pre-milled window

Also Published As

Publication number Publication date
NO854878L (no) 1986-06-09

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Inventor name: TOLLE, GLEN CONRAD