WO2015004203A1 - Système de forage d'un trou de forage et utilisation de celui-ci - Google Patents

Système de forage d'un trou de forage et utilisation de celui-ci Download PDF

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Publication number
WO2015004203A1
WO2015004203A1 PCT/EP2014/064753 EP2014064753W WO2015004203A1 WO 2015004203 A1 WO2015004203 A1 WO 2015004203A1 EP 2014064753 W EP2014064753 W EP 2014064753W WO 2015004203 A1 WO2015004203 A1 WO 2015004203A1
Authority
WO
WIPO (PCT)
Prior art keywords
drill string
flow restrictor
drilling
flow
borehole
Prior art date
Application number
PCT/EP2014/064753
Other languages
English (en)
Inventor
Petrus Cornelis Kriesels
Original Assignee
Shell Internationale Research Maatschappij B.V.
Shell Oil Company
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 Shell Internationale Research Maatschappij B.V., Shell Oil Company filed Critical Shell Internationale Research Maatschappij B.V.
Publication of WO2015004203A1 publication Critical patent/WO2015004203A1/fr

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
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1014—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well
    • 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
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1057—Centralising devices with rollers or with a relatively rotating sleeve
    • 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

Definitions

  • the present invention relates to a system for drilling a borehole and to the use thereof.
  • the system is suitable for drilling boreholes for the production of hydrocarbons .
  • stabiliser blades of different radial sizes cleaning elements, roller reaming tool elements, etc.
  • the cleaning elements may for instance comprise brush assemblies and scraping bristles.
  • the invention provides a drilling system for drilling a borehole in a formation, comprising:
  • the flow restrictor provides resistance to the tangential flow of fluid.
  • the restricted flow of the fluid displaced in longitudinal direction dampens the unwanted transverse vibrations of the drill string.
  • the drilling system thereby behaves more predictable and unwanted vibrations are significantly reduced.
  • the at least one flow restrictor comprises a sleeve which is rotatably arranged around the drill string.
  • the flow restrictor can remain stationary with respect to the formation during drilling, to limit friction and corresponding adverse effects on the drilling operation, while also dampening vibrations.
  • the invention also relates to a method of drilling a borehole in a formation, comprising the steps of:
  • the drill string comprises an elongate element and a sleeve extending around the elongate element, the sleeve being rotatable relative to the elongate element about a longitudinal axis thereof, wherein each flow restrictor is connected to the sleeve.
  • This arrangement allows the elongate element to rotate about said longitudinal axis while the sleeve is substantially geostationary, i.e. non-rotating or stationary with respect to the formation.
  • the flow restrictor may extend over a predetermined length of the drill string, in particular of the Bottom Hole Assembly (BHA) .
  • BHA Bottom Hole Assembly
  • the flow restrictor may extend along more than 50% of the length of the BHA.
  • the vibration damping effect is considerable, and well exceeds any effect conventional elements of the BHA such as drill collars, stabilizers, etc, may have in this respect .
  • the bristles have a radial size of at least the largest width of the annular space when the drill string is eccentrically positioned in the borehole.
  • the brush device has a spring stiffness of between about 4000 to 6000 N/m, for example about 5000 N/m. Further, the brush device may have an axial length of between about 0.5 to 1.5 m, for example a length of 1 m .
  • Fig. 1 shows a cross section of a wellbore including an embodiment of the drilling system of the invention
  • Fig. 3 shows a cross-section of a flow restrictor in plan view along line 3-3 of Fig. 2 in a first state of use ;
  • Fig. 5 shows the cross-section of Fig. 4 including a schematic indication of fluid flow during drilling.
  • the bottom hole assembly 12 may be provided with a first set of flow restrictor elements 28 fixedly
  • Each flow restrictor may include a brush device having a plurality of flexible bristles 32 extending in radial direction with respect to the drill string 4.
  • the flow restrictors are at least partially permeable for drilling fluid in longitudinal direction but also provide flow resistance to drilling fluid flowing in said longitudinal direction through the flow restrictors.
  • the bristles 32 may be made of any suitable material, for example a metal or a synthetic material. In order to prevent drilling fluid from bypassing the flow
  • Fig. 5 shows a cross-section in plan view of a flow restrictor during drilling.
  • arrows 36 indicate the tangential flow of drilling fluid in the wellbore 1 with respect to the drill string 4 during drilling.
  • Drilling fluid is pumped from surface via an interior fluid passage of the drill string 4 to the drill bit 13, which expels the drilling fluid.
  • a return flow of drilling fluid flows upwardly through the annular space 14 to surface, taking along drill cuttings resulting from the cutting action of the drill bit 13.
  • the sleeves 24, 26, with the flow restrictors 28, 30 connected thereto remain substantially stationary (i.e. do not rotate) in the wellbore due to drag from the wellbore wall and the drilling fluid present in the annular space 14.
  • the drill string 4 is relatively long. Relative to the target depth of the wellbore, which typically is in the order of several kilometres (thousands of feet) or more, the diameter of the drill string is very small.
  • each drill pipe section comprises a long tubular section with a specified outside diameter, for instance 3.5 inch, 4 inch, 5 inch, 5.5 inch, 5-7/8 inch, or 6-5/8 inch (7.6 to 15 cm), whereas the drill string has a total length extending to the downhole end of the borehole, which can be several kilometres. In other words, the ratio of diameter to length of the drill string is very small, typically smaller than 1CT 5 .
  • the drill string Since the width of the drill string is very small in proportion to its length, the drill string forms a slender body that easily flexes. As a result, the drill string tends to vibrate during drilling, including vibrations in transverse direction of the wellbore. The problem is more pronounced at higher rotational speeds, for example at rotational speeds exceeding about 100 to 150 rpm (rotations per minute) . These transverse vibrations may lead to enhanced wear and mechanical failure of the drill string, and consequently to a reduced rate of penetration (ROP) of the drill string. Also, undesired irregularities of the wellbore geometry may result .
  • ROP rate of penetration
  • a flow restrictor may have a permeability in longitudinal direction between about 10 5 to 10 7 mD .
  • a flow restrictor, or a flow restrictor element may have a porosity between about 0.4 to 0.6.
  • permeability is expressed in mD, or millidarcy.
  • the SI unit for permeability is m 2 .
  • 1 Darcy is about 10 ⁇ 12 m 2 .
  • Porosity is expressed as the ratio V v / V T .
  • V v is the volume of void-space (possible available for drilling fluid)
  • V T is the total or bulk volume of material, including the solid and void components.
  • the porosity indicated here includes the porosity of the flow restrictor elements as presented to the circular flow of drilling fluid during rotary drilling.
  • the present invention is not limited to the

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

L'invention concerne un système de forage pour forer un trou de forage dans une formation géologique, comprenant un train de forage et au moins un réducteur de débit agencé pour s'étendre radialement à partir du train de forage vers la paroi du trou de forage. Chaque réducteur de débit est perméable dans la direction tangentielle au train de forage. Le réducteur de débit est agencé pour fournir une résistance au flux de fluide de forage qui circule dans la direction tangentielle au train de forage au travers du réducteur de débit.
PCT/EP2014/064753 2013-07-11 2014-07-09 Système de forage d'un trou de forage et utilisation de celui-ci WO2015004203A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP13176029.0 2013-07-11
EP13176029 2013-07-11

Publications (1)

Publication Number Publication Date
WO2015004203A1 true WO2015004203A1 (fr) 2015-01-15

Family

ID=48808161

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/064753 WO2015004203A1 (fr) 2013-07-11 2014-07-09 Système de forage d'un trou de forage et utilisation de celui-ci

Country Status (1)

Country Link
WO (1) WO2015004203A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109138921A (zh) * 2018-10-31 2019-01-04 延安奇源石油工程技术服务有限公司 一种自喷井自动刮蜡器
US11680455B2 (en) 2018-11-13 2023-06-20 Rubicon Oilfield International, Inc. Three axis vibrating device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2890019A (en) * 1956-03-26 1959-06-09 Jan J Arps Earth borehole logging system
US5447200A (en) * 1994-05-18 1995-09-05 Dedora; Garth Method and apparatus for downhole sand clean-out operations in the petroleum industry
US20060207796A1 (en) * 2005-03-14 2006-09-21 Stable Services Limited Multi-function downhole tool
US20070261855A1 (en) * 2006-05-12 2007-11-15 Travis Brunet Wellbore cleaning tool system and method of use
US20070278011A1 (en) * 2006-05-30 2007-12-06 Bbj Tools Inc. Cuttings bed removal tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2890019A (en) * 1956-03-26 1959-06-09 Jan J Arps Earth borehole logging system
US5447200A (en) * 1994-05-18 1995-09-05 Dedora; Garth Method and apparatus for downhole sand clean-out operations in the petroleum industry
US20060207796A1 (en) * 2005-03-14 2006-09-21 Stable Services Limited Multi-function downhole tool
US20070261855A1 (en) * 2006-05-12 2007-11-15 Travis Brunet Wellbore cleaning tool system and method of use
US20070278011A1 (en) * 2006-05-30 2007-12-06 Bbj Tools Inc. Cuttings bed removal tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109138921A (zh) * 2018-10-31 2019-01-04 延安奇源石油工程技术服务有限公司 一种自喷井自动刮蜡器
US11680455B2 (en) 2018-11-13 2023-06-20 Rubicon Oilfield International, Inc. Three axis vibrating device

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