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WO2015160261A1 - Appareil d'essuyage de tiges - Google Patents

Appareil d'essuyage de tiges Download PDF

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Publication number
WO2015160261A1
WO2015160261A1 PCT/NO2015/050068 NO2015050068W WO2015160261A1 WO 2015160261 A1 WO2015160261 A1 WO 2015160261A1 NO 2015050068 W NO2015050068 W NO 2015050068W WO 2015160261 A1 WO2015160261 A1 WO 2015160261A1
Authority
WO
WIPO (PCT)
Prior art keywords
wiper
landing
drill string
wiper apparatus
buoyancy body
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.)
Ceased
Application number
PCT/NO2015/050068
Other languages
English (en)
Inventor
Ketil Oddvar BOTNMARK
Kjell Mikalsen
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.)
2K TOOLS AS
Original Assignee
2K TOOLS AS
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 2K TOOLS AS filed Critical 2K TOOLS AS
Publication of WO2015160261A1 publication Critical patent/WO2015160261A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/006—Accessories for drilling pipes, e.g. cleaners
    • 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
    • E21B37/00—Methods or apparatus for cleaning boreholes or wells
    • E21B37/02—Scrapers specially adapted therefor
    • E21B37/04—Scrapers specially adapted therefor operated by fluid pressure, e.g. free-piston scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/043—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes
    • B08B9/0436—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes provided with mechanical cleaning tools, e.g. scrapers, with or without additional fluid jets

Definitions

  • the present invention relates to an apparatus for cleaning a drill string of drilling mud and other fluids during tripping of the drill string.
  • the drill string consists of coupled drill pipes, and when the drill string is pulled out, lengths of three coupled drill pipes are usually extracted at once and placed in a piperack. These, usually three, pipes are called a stand.
  • the pulling out (tripping) is performed by pulling the drill string up and breaking it stand by stand or pipe by pipe until the whole drill string is pulled out.
  • a wiper for use in a drill string is described.
  • the wiper floats in the drilling fluid, and during tripping a peripheral ledge on the device wipes the inner wall of the drill string clean of fluid.
  • the apparatus is provided with a mass and a volume such that it can float during tripping on a liquid surface of the drilling mud in the drill string.
  • the apparatus comprises wiper devices.
  • WO 2006/006872- Al describes internal removal of drilling mud from a drill string by use of a bellows-shaped wiper being attached with weight and volume so that it floats on the surface of the drilling mud in the drill string during tripping.
  • the wiper has at least one channel for allowing drilling mud to pass through.
  • US 4.671.358-Al describes wiper plugs which are used in cementing procedures, where the wiper part lands and is fixated in a landing shoulder so that the wiper halts and opens a valve for allowing the cement to flow downwards through the valve.
  • a so-called landing sub comprising a landing seat may be mounted.
  • the landing seat may beneficially be formed as an integral part of the longitudinal bore in the landing sub, or alternatively be inserted loosely in the same bore. An embodiment of such a landing seat is discussed in NO 330743.
  • the landing sub is advantageously mounted in the drill string by use of thread connections.
  • a landing cone which is arranged to seat itself in a landing seat according to NO 330743 may be supplied with a central bore which is in connection with a central bore extending longitudinally through the wiper.
  • the landing cone may further be designed with a number of flow channels which reduce the flow area past the landing cone/seat as little as possible.
  • the drill pipe has a constriction, a so-called tool joint, which makes the flow area smaller than further down the drill pipe, where the diameter is larger.
  • the object of the present invention is to alleviate the above-mentioned problems in a simple way.
  • a wiper apparatus for cleaning a drill string of drilling mud during tripping of the drill string according to the characterizing part of independent claim 1.
  • Fig. 1 shows an embodiment of the present invention on the inside of a drill string
  • Fig. 2 shows the same embodiment as fig. 1, but with a different location in the drill string
  • Fig. 3 shows an upper portion of an embodiment of the present invention
  • Fig. 4 shows the same as fig. 3, slightly more detailed,
  • Fig. 5 shows a part of a lower portion of an embodiment of the present invention
  • Fig. 6 shows a part of a lower portion of an alternative embodiment of the present invention.
  • FIG 1 A typical embodiment of the wiper apparatus 1 according to the invention is shown in figure 1.
  • the wiper apparatus 1 comprises a landing member 2, a buoyancy body 3, one or more centering elements 4 and a number of wiper members 5, 6, 7.
  • the wiper apparatus 1 is located in a drill string 20, the drill string 20 being inserted in a landing sub 21.
  • the illustration is reduced/compressed for convenience. It will be understood that the individual elements that are cut through and contracted may be shorter.
  • Buoyancy body 3 may be tubular and may for example have an outer diameter of approx. 2/3 of the inner diameter of the drill string.
  • the buoyancy body 3 may be made of metal, a metal alloy or a composite material. In an advantageous embodiment, the buoyancy body 3 may be made of aluminum.
  • the buoyancy body 3 may be provided with bursting members 8 (see figure 3) which are made to burst if the pressure in the drill string exceeds a predetermined pressure. Thereby, such bursting members 8 ensure that the buoyancy body 3, which normally will be hollow and filled with air, will not collapse if the pressure in the drill string increases. The pressure in the drill string will increase, for example, if one starts to pump fluids through the drill string.
  • the wiper apparatus 1 may comprise one or more centering elements 4 which for example are provided in an upper and lower portion of the wiper apparatus 1; 30, 31, respectively.
  • the terms “upper” and “lower” refer to a conventional vertical orientation of a drill string; however, a diagonal or horizontal orientation is also contemplated.
  • the centering elements 4 are shown, these being provided on the lower portion 31 of the wiper apparatus 1.
  • the wiper members 5, 6, 7 will be able to function as centering elements for the upper portion of the wiper apparatus 1.
  • the centering element consists of a wiper member instead of more conventional centering elements.
  • the wiper apparatus 1 comprises a spacer 9 between the upper and lower portion of the wiper apparatus 1.
  • This spacer 9 comprises a rod or pipe element having a diameter which is significantly smaller than the smallest ID of the drill string (as previously mentioned, the smallest ID of the drill string is often at tool joint 22, i.e. the constrictions of the inside of the drill string at each joint of each drill pipe).
  • the tool joint 22 itself often comprises thicker material, which results in a smaller inner diameter.
  • the spacer 9 is provided with such a length that the lower portion of the wiper apparatus 1 will be located where the drill string has the largest ID when the upper portion of the wiper apparatus 1 is located in tool joint 22.
  • the flow area through tool joint 22 will be unacceptably small if a space-demanding tool is located there as well. With a correctly adjusted spacer 9, the flow area will increase for normal drill pipes, and also allow the use of a wiper apparatus 1 in drill strings of a smaller type (with smaller ID).
  • the lower portion of the wiper apparatus 1 may comprise a nose piece 11 which for example may be coated with a shock-absorbing material.
  • the upper portion 30 of the wiper apparatus 1 comprises a landing member 2 which is designed to seat itself in a landing seat 10.
  • the landing member 2 may be conical in shape or have any other suitable design.
  • the landing member 2 is further designed not to block flow through the drill string, for instance by having flow channels 12 which give the largest possible flow area past the landing member.
  • An example of how the flow channels 12 may be designed in the landing member is shown in figures 3 and 4.
  • the landing member 2 may be designed to allow fluids to flow on the outside of the landing member 2 when it is placed in the landing seat 10.
  • the landing seat 10 may be designed to reduce the flow area past the landing seat 10 as little as possible, both with and without the landing member 2 of the wiper apparatus 1 in place in the landing seat 10.
  • the landing seat 10 may comprise a suitable number of, e.g. three or more, appropriately designed pegs, cams, longitudinal rails or slits arranged on the inside of a landing sub 21.
  • a possible embodiment comprising longitudinal pegs is shown in figure 4.
  • the number of wiper members 5, 6, 7 arranged may be adapted according to need. It may be appropriate to arrange wiper members 5, 6, 7 with such a spacing that only one, or max. two, of the wiper members 5, 6, 7 are located in the tool joint when the wiper apparatus 1 passes.
  • Figures 3 and 4 show two wiper members 5, 6 in the tool joint / landing sub. This will help reduce the risk that the wiper apparatus 1 becomes stuck.
  • the wiper members 5, 6, 7 may be designed with different diameters adapted to the normal ID of the drill string, the reduced ID through the tool joint and possibly the even more reduced ID through the landing sub, respectively.
  • the tool joint 22 itself often comprises thicker material, which results in a smaller inner diameter.
  • a potential smaller wiper member having a smaller outer diameter will be better suited to wipe drilling fluid residues from this smaller, inner diameter.
  • One of the two wiper members shown in figures 3 and 4 may therefore have a smaller diameter adapted to the smallest ID of the drill string 20.
  • the wiper members may typically be made of polyurethane, HNBR or another flexible and chemically resistant material which allows the shape of the wiper device to change and maintain its wiper function even in cases where the inner diameter of the drill string varies slightly.
  • the apparatus 1 is placed in a drill string 20 with an internal surface when tripping (breaking) of the drill string is to be initialted/performed.
  • the drill string contains mud / drilling fluid with a drilling fluid surface, and possibly residues of hydrocarbons, cement, salt water etc.
  • the buoyancy body 3 of the wiper apparatus 1 is provided with a mass and a volume adapted so that the device will stay afloat on the drilling fluid surface.
  • the weight of the wiper apparatus ensures that it falls down to the liquid surface and places the peripheral ledge of the bottom wiper member at a short distance (for example at least approx. 10-15 cm) above the liquid surface.
  • the wiper apparatus will always stay on the liquid surface and wipe off the drilling mud that sticks to the inner surface of the drill string.
  • the length may be approx. 4 m.
  • a typical total weight of the wiper apparatus 1 may be approx. 5 kg. It will be understood that lengths as well as weights may be varied and adapted to the actual use and any special applications.
  • Figure 2 shows a situation where the landing member 2 of the wiper apparatus 1 is not in the landing seat.
  • the length of the spacer 9 should be adapted so that the upper portion 30 and the lower portion do 31 not simultaneously pass respective tool joints 22. This also applies to the case where the landing member 2 of the wiper apparatus 1 is in the landing seat. In that case, the length of the spacer 9 should be adjusted so that the lower portion 31 is located in an area of the drill string between two tool joints 22.
  • the wiper apparatus 1 at all times will be located on top of the liquid surface, removing the wiper apparatus 1 during tripping of the drill string 20 will normally be easy. Generally, the liquid surface will be slightly above the drill deck when tripping starts. The liquid surface will fall as the drill string is pulled out because the fluid in the well in which the drill string 20 is located will take up the volume that the drill string 20 previously occupied.
  • retrieving equipment suited for this purpose may be used to retrieve the apparatus 1.
  • the wiper apparatus 1 may be provided with a fish neck or other types of devices for coupling and attachment of fishing equipment for retrieving the apparatus.
  • Drilling mud has a varying self -weight. Accordingly, a favourable embodiment of the apparatus may have replaceable weights / weight elements or varying buoyancy of the buoyancy body 3.

Landscapes

  • 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)

Abstract

La présente invention concerne un appareil d'essuyage (1) destiné à nettoyer l'intérieur d'un train de tiges de forage de la boue de forage ou d'autres fluides de puits au cours d'opérations de forage, l'appareil (1) étant conçu de façon à flotter sur une surface liquide de la boue de forage dans le train (20) de tiges de forage ou de façon à être suspendu à un siège à portée intérieure (10), le siège à portée intérieure étant agencé dans une réduction à portée intérieure (21), l'appareil (1) comprenant un organe à portée intérieure (2), au moins un corps de flottaison (3), au moins un élément de centrage (4) et au moins un organe d'essuyage (5, 6, 7). Le dispositif d'essuyage (1) comprend une entretoise (9) entre une partie supérieure (30) et inférieure (31) de l'appareil (1), l'entretoise (9) présentant une longueur telle que le corps de flottaison (3) et l'élément de centrage (4) ne sont pas situés dans la réduction à portée intérieure ou le raccord d'outil lorsque l'appareil d'essuyage (1) est suspendu au siège à portée intérieure ou repose contre celui-ci, le corps de flottaison (3) et l'élément de centrage (4) étant agencés dans une partie inférieure (31) de l'appareil (1) et l'organe à portée intérieure (2) étant agencé dans une partie supérieure (30) de l'appareil (1).
PCT/NO2015/050068 2014-04-14 2015-04-14 Appareil d'essuyage de tiges Ceased WO2015160261A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20140481 2014-04-14
NO20140481 2014-04-14

Publications (1)

Publication Number Publication Date
WO2015160261A1 true WO2015160261A1 (fr) 2015-10-22

Family

ID=54324341

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2015/050068 Ceased WO2015160261A1 (fr) 2014-04-14 2015-04-14 Appareil d'essuyage de tiges

Country Status (1)

Country Link
WO (1) WO2015160261A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287948A (en) 1979-03-30 1981-09-08 Haggard I. D. Wiper, Inc. Tubular member interior wiper
US4671358A (en) 1985-12-18 1987-06-09 Mwl Tool Company Wiper plug cementing system and method of use thereof
US4923011A (en) * 1989-08-21 1990-05-08 Uvon Skipper Drill stem mud wiping apparatus
GB2308140A (en) * 1995-12-15 1997-06-18 Archie Karl Haggard Drill pipe wiper assembly
WO2006006872A1 (fr) 2004-07-15 2006-01-19 2K Tech As Dispositif permettant d'essuyer l'interieur de tiges de forage
NO330743B1 (no) 2009-06-03 2011-06-27 2K Tools As Landesub for avskraper

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287948A (en) 1979-03-30 1981-09-08 Haggard I. D. Wiper, Inc. Tubular member interior wiper
US4671358A (en) 1985-12-18 1987-06-09 Mwl Tool Company Wiper plug cementing system and method of use thereof
US4923011A (en) * 1989-08-21 1990-05-08 Uvon Skipper Drill stem mud wiping apparatus
GB2308140A (en) * 1995-12-15 1997-06-18 Archie Karl Haggard Drill pipe wiper assembly
WO2006006872A1 (fr) 2004-07-15 2006-01-19 2K Tech As Dispositif permettant d'essuyer l'interieur de tiges de forage
NO330743B1 (no) 2009-06-03 2011-06-27 2K Tools As Landesub for avskraper

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