EP1740793A1 - A telescopic conductor casing for a well installation and a method of driving same into the underground - Google Patents

A telescopic conductor casing for a well installation and a method of driving same into the underground

Info

Publication number
EP1740793A1
EP1740793A1 EP05734779A EP05734779A EP1740793A1 EP 1740793 A1 EP1740793 A1 EP 1740793A1 EP 05734779 A EP05734779 A EP 05734779A EP 05734779 A EP05734779 A EP 05734779A EP 1740793 A1 EP1740793 A1 EP 1740793A1
Authority
EP
European Patent Office
Prior art keywords
outer pipe
conductor casing
inner pipe
pipe
accordance
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.)
Granted
Application number
EP05734779A
Other languages
German (de)
French (fr)
Other versions
EP1740793B1 (en
Inventor
Harald Strand
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1740793A1 publication Critical patent/EP1740793A1/en
Application granted granted Critical
Publication of EP1740793B1 publication Critical patent/EP1740793B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

Abstract

A conductor casing device for establishing and lining a wellbore in unconsolidated sediments, the conductor casing being arranged to be driven into and to displace the unconsolidated sediments by axially directed impulses against an internal abutment in the lower portion of the conductor casing, where the conductor casing is telescopic. The invention also comprises a method of driving a telescopic conductor casing into unconsolidated sediments.

Description

A TELESCOPIC CONDUCTOR CASING FOR A WELL INSTALLATION AND A METHOD OF DRIVING SAME INTO THE UNDERGROUND
The invention regards a telescopic conductor casing for a well installation, preferably a sub sea hydrocarbon well, more particularly a telescopic conductor casing in which an outer pipe is releasably coupled to an inner pipe, the lower end of which comprises means of cooperating with a driving mechanism. When the conductor casing has been driven far enough into the unconsolidated sediments so as to project a prescribed distance above the surface of the unconsolidated sediments, the outer pipe is separated from the inner pipe. The inner pipe is driven furthe-tr into the unconsolidated sediments until it encounters solid sediments or reaches the planned driving depth. A device by the lower end of the outer pipe ensures that the outer pipe cannot be pushed down on the outside the inner pipe. The invention also comprises a method of driving a telescopic conductor casing into the ground.
When establishing a well such as a hydrocarbon well in an area with unconsolidated sediments above the rock structures, it is necessary to insert a concLuctor casing through the unconsolidated sediments. The conductor casing separates the wellbore from the unconsolidatecl sediments and acts as a foundation for installations (wellhead, BOP etc.) at the
P24603PC00Deprio - 07.04.2005 surface of the unconsolidated sediments. The installations will, in accordance with regulations, be placed at a certain height relative to the surface, i.e. ground surface or seabed. Analyses of the unconsolidated sediments form the basis for the selection of a conductor casing length, which in all probability can be driven far enough down for the upper end of the conductor casing to attain a prescribed height above the unconsolidated sediments. When there is uncertainty with regards to the condition of the unconsolidated sediments, the length of the conductor casing may be to great or too small, and it becomes necessary, particularly when establishing a sub sea well, to carry out complicated operations to lengthen or shorten the conductor casing so as to achieve the correct height for the upper end of the casing.
The object of the invention is to remedy the disadvantages of prior art. In particular, the object is to reduce the cost and practical effects of the uncertainty involved in estimating how far the conductor casing can be driven.
The invention also allows the installation of long conductor casings without requiring additional conductor casing sections to be added during the driving.
The object is achieved by the characteristics given in the description below and in the following claims.
A telescopic conductor casing according to the invention is arranged in a known manner to be driven into unconsolidated sediments by means of axially directed impulses against internally placed impact surfaces, preferably in the lower portion of an inner pipe. The inner pipe is removably coupled to an outer pipe, preferably by an upper portion of the inner pipe being coupled to an upper portion of the outer pipe.
P24603PC00Deprio - 07.04.2005 In the lower portion of the outer pipe there is provided, in a non-displaceable manner, one or more locking members abutting the outside wall of the inner pipe. The locking element (s) is/are arranged to allow an inner pipe released from the outer pipe to move axially away from the upper portion of the outer pipe. The locking element (s) is/are furthermore arranged to prevent an outer pipe released from the inner pipe to move axially towards the lower portion of the inner pipe.
Preferably, the outer pipe is arranged to receive one or more known stabilizers located externally. This is particularly relevant when the conductor casing is to be placed in unstable unconsolidated sediments. The stabilizers causes the conductor casing to present a greater abutment surface to the unconsolidated sediments, whereby the unconsolidated sediments can accommodate a greater load directed radially of the pipe.
Preferably, the outer pipe is provided with one or more stops arranged to abut an upper portion of the stabilizer (s) . This makes it possible to place the stabilizer (s) at a predefined level relative to the surface of the unconsolidated sediments when they are driven into the unconsolidated sediments along with the outer pipe.
The invention further comprises a method of driving a conductor casing into unconsolidated sediments in order to line a wellbore, the conductor casing being arranged to be driven into the unconsolidated sediments by axially directed impulses against an internal abutment in the lower portion of the conductor casing, where: - an outer pipe is removably coupled to the upper portion of an inner pipe; the compound telescopic conductor casing is driven into the unconsolidated sediments until the upper portion of the outer pipe assumes a prescribed distance from the surface of
P24603PC00Deprio - 07.04.2005 th-e unconsolidated sediments; the outer pipe is released from the inner pipe; the inner pipe is driven further into the unconsolidated sediments until it reaches the planned driving depth or until no further driving is possible, the inner pipe moving away from the upper portion of the outer pipe in the axial direction.
Preferably, the method comprises the provision of one or more stabilizers on the outer pipe prior to driving this into the unconsolidated sediments.
Th-e following describes a non-limiting example of a preferred embodiment illustrated in the accompanying drawings, in wb-ich:
Figure 1 shows a longitudinal section through an assembled telescopic conductor casing according to the invention;
Figure 2 shows a longitudinal section, on a smaller scale, tb-rough an assembled telescopic conductor casing being driven into unconsolidated sediments;
Figure 3 shows a longitudinal section through the telescopic conductor casing being driven into unconsolidated sediments, with an inner pipe sliding in a disconnected outer pipe;
Figure 4 shows a side view of a conductor casing corresponding to the longitudinal section of figure 3, but where the outer pipe is provided with a stabilizer; and
Figure 5 shows a top view of the conductor casing in figure 4.
P24603PC00Deprio - 07.04.2005 Reference is first made figure 1, in which a telescopic conductor casing 1 comprises an inner pipe 3, an outer pipe 5, an annular coupling device 7 and also an annular locking member 9.
The upper portion 11 of the inner pipe 3 is provided with an annular coupling groove 13. A lower portion 15 of the inner pipe 3 is provided with a driving shoe 17 with an internal striking surface 19.
An upper portion 21 of the outer pipe 5 is provided with an external coupling section 23 capable of receiving and retaining a well installation (not shown) . The outside of a central portion 25 of the outer pipe has annular stabilizing stops 27. A lower portion 28 of the outer pipe is provided with an internal annular locking groove 29.
The coupling device 7 has an internal coupling section 31 that extends from a lower central opening 33. The threaded portion 31 of the coupling device 7 is a complementary fit to the coupling section 23 on the outer pipe 5. An upper bore 35 is a complementary fit to the outer diameter of the inner pipe 3. An annular shoulder 37 is a complementary fit to the coupling croove 13 on the inner pipe 3. The coupling device is removable, being divisible (not shown) by means of a tool- bearing remote operated vehicle (not shown) .
The locking element 9 is shaped like an annular disk spring with a convex ring surface 41 facing the lower end 15 of the outer pipe 5. An internal lip 43 tightly abuts the outer wall of the inner pipe 3.
Reference is now made essentially to figures 2 and 3. The conductor casing 1 has been driven into unconsolidated sediments 51 by means of an internally placed hammer 61, 63 connected to a driving and control mechanism (not shown) via
P24603PC00Deprio - 07.04.2005 a cable 65. The hammer 61, 63 can transmit driving impulses to the conductor casing via the impact surface 19.
In an alternative embodiment the conductor casing 1 is provided with a cylindrical stabilizer 71 enclosing portions of the outer pipe 5. A central pipe 73 encloses the outer pipe 5 coaxially and abuts the stabilizer stop 27 when in the active position. A cylindrical jacket 77 is coaxial with the central pipe 73 and is rigidly connected to this by several supporting ribs 75 that project in the radial direction from the central pipe 73 and extend along the entire axial length of the stabilizer 71.
Prior to driving a conductor casing 1 into the ground, the unconsolidated sediments 51 are analysed to find out how far the conductor casing 1 can be driven and how much uncertainty exists around this analysis, i.e. what is the expected maximum driving epth and what is the estimated minimum driving depth. T-hen a length of inner pipe 3 is selected which under no circumstances will cause the inner pipe 3 to protrude above tϊie unconsolidated sediments by more than what is prescribed for a well installation which is subsequently to be installed on the conductor casing 1. Also, the length of the outer pipe 5 is selected to be such that the outer pipe 5, when protruding above the unconsolidated sediments 51 as prescribed with regard to the well installation, overlaps the inner pipe w-hen this has been driven down to the maximum depth.
The conductor casing 1 is driven into the unconsolidated sediments 51 in a manner that is known per se, by the hammer 61, 63 partly making a hole by penetrating into the unconsolidated sediments 51 and forcing them aside and partly hammering the conductor casing into the unconsolidated sediments 51 through impacts against the impact surface 19 on the driving shoe 17. During the first part of the driving,
P24603PC00Deprio - 07.04.2005 the coupling device 7 interconnects the inner and outer pipes 3, 5 of the conductor casing 1.
When the outer pipe 5 has reached a prescribed depth, i.e. it protrudes above the unconsolidated sediments 51 at a prescribed height, the coupling device 7 is removed; at a sub sea installation preferably through use of tools on a remote operated vehicle (ROV) .
The driving then continues, the inner pipe 3 moving axially through the outer pipe 5 by sliding through the locking member 9. When the inner pipe 3 has reached its maximum depth the hammer 61, 63 is retrieved from the conductor casing 1.
In the alternative embodiment where the outer pipe 5 has a stabilizer 71, this is driven into the unconsolidated sediments together with the outer pipe 5, the central pipe 73 of the stabilizer 71 abutting the stabilizer stop 27. The large surface area of the jacket 77 ensures, in a manner that is known per se, an increase in the lateral stability of the conductor casing 1 when placed in unstable unconsolidated sediments 51.
The conical shape of the locking member 9 ensures that the outer pipe 5 will not slip down the inner pipe 3 under stress, as the internal lip 43 of the locking member 9 will seize against the surface of the inner pipe 3.
The conductor casing 1 according the invention can assume a wide range of dimensions, as the inner pipe can assume all relevant dimensions according to industrial practice.
P24603PC00Deprio - 07.04.2005

Claims

C 1 a i m s
1. A conductor casing device (1) for establishing and lining a wellbore in unconsolidated sediments (51) , the conductor casing (1) being arranged to be driven into 5 and to displace the unconsolidated sediments (51) by axially directed impulses against an internal abutment (19) in the lower portion (15) of the conductor casing (1), c h a r a c e r i z e d i n that the conductor casing (1) is telescopic.
ID 2. A device in accordance with Claim 1, c h a r a c t e r i z e d i n that an outer pipe (5) is releasably coupled to an inner pipe (3) by means of a coupling device (7) .
3. A device in accordance with Claim 1, is c h a r a c t e r i z e d i n that an upper portion (21) of the outer pipe (5) is releasably coupled to an upper portion (11) of the inner pipe (3) .
4. A device in accordance with Claim 1, c h a r a c t e r i z e d i n that one or more
20 locking members (9) abutting the outside wall of the inner pipe (3) are arranged in a non-displaceable manner in the lower portion (28) of the outer pipe (5) .
5. A device in accordance with Claim 1, c h a r a c t e r i z e d i n that the locking
25 member (s) is/are arranged to allow an inner pipe (3) released from the outer pipe (5) to move axially away from the upper portion (21) of the outer pipe (5) .
6. A device in accordance with Claim 1, c h a r a c t e r i z e d i n that that the
P24603PC00Deprio- 07.04.2005 locking member (s) is/are -arranged to prevent an outer pipe (5) released from the inner pipe (3) to move axially towards the lower portion (15) of the inner pipe (3) .
7. A device in accordance with Claim 1, c h a r a c t e r i z e d i n that the outer pipe (5) is arranged to receive one or more externally placed stabilizers (71) .
8. A device in accordance with Claim 7, c h a r a c t e r i z e d i n that the outer pipe (5) is provided with one or more stops (7) arranged to abut an upper portion of the stabilizer (s) .
9. A device in accordance with Claim 1, c h a r a c t e r i z e d i n that the lower portion (15) of the inner pipe (3) is provided with a driving shoe (17) arranged to receive axially directed driving impulses.
10. A method of driving a conductor casing (1) into unconsolidated sediments (51) in order to establish and line a wellbore, the conductor casing (1) being arranged to be driven into and to displace the unconsolidated sediments (51) through axially directed impulses against an internal abutment (19) in the lower portion (15) of the conductor casing (1) , c h a r a c t e r i z e d i n that : an outer pipe (5) is releasably coupled to the upper portion (11) of an inner pipe (3); the assembled telescopic conductor casing (1) is driven into the unconsolidated sediments (51) until the upper portion (21) of the outer pipe (5) assumes a prescribed height above the surface of the unconsolidated sediments (51); the outer pipe (5) is released from the inner pipe
P24603PC00Deprio - 07.04.2005 (3) ; the inner pipe (3) is driven further into the unconsolidated sediments (51) until it stops against a preferably impenetrable structure (53), the inner pipe (3) moving axially away from the upper portion (21) of the outer pipe (5) .
11. A method in accordance with Claim 10, c h a r a c t e r i z e d i n that one or more stabilizers (71) are mounted on the outer pipe (5) prior to driving this into the unconsolidated sediments (51) .
P24603PC00Deprio - 07.04.2005
EP05734779A 2004-04-13 2005-04-13 A telescopic conductor casing for a well installation and a method of driving same into the underground Active EP1740793B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20041495A NO320467B1 (en) 2004-04-13 2004-04-13 Telescopic conductor for a well installation and method for driving the same underground.
PCT/NO2005/000120 WO2005100732A1 (en) 2004-04-13 2005-04-13 A telescopic conductor casing for a well installation and a method of driving same into the underground

Publications (2)

Publication Number Publication Date
EP1740793A1 true EP1740793A1 (en) 2007-01-10
EP1740793B1 EP1740793B1 (en) 2007-10-31

Family

ID=34859256

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05734779A Active EP1740793B1 (en) 2004-04-13 2005-04-13 A telescopic conductor casing for a well installation and a method of driving same into the underground

Country Status (8)

Country Link
US (1) US20080257603A1 (en)
EP (1) EP1740793B1 (en)
AT (1) ATE377129T1 (en)
BR (1) BRPI0509802B1 (en)
CA (1) CA2562891A1 (en)
DE (1) DE602005003118D1 (en)
NO (1) NO320467B1 (en)
WO (1) WO2005100732A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102454368A (en) * 2010-11-02 2012-05-16 李征 Telescopic drill rod and cast-in-situ cylindrical pile rotary drilling machine with same
JP6977934B2 (en) * 2017-09-05 2021-12-08 株式会社ダイカ Pipe driving method

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1048470A (en) * 1911-04-25 1912-12-24 Edgard Frankignoul Tubing for boring.
US1210160A (en) * 1914-12-02 1916-12-26 Edgard Frankignoul Tubing for boring.
US1342424A (en) * 1918-09-06 1920-06-08 Shepard M Cotten Method and apparatus for constructing concrete piles
US1906706A (en) * 1931-05-06 1933-05-02 Thomas F Moore Hole punching device
US2846016A (en) * 1954-03-19 1958-08-05 Huntsinger Associates Stop collar for well casing
US4368785A (en) * 1980-07-31 1983-01-18 Gondek John T Well point and method of driving same
DE3908646A1 (en) * 1989-03-16 1990-09-20 Klemm Bohrtechnik Gmbh G Drill stem
DE4224831A1 (en) * 1992-07-28 1994-02-03 Beb Erdgas & Erdoel Gmbh Method and device for the underground introduction of transport pipes of greater length into the ground
US5540294A (en) * 1995-02-14 1996-07-30 Anderberg Construction Company Vertical percussion ground boring tool apparatus and method
US6102119A (en) * 1998-11-25 2000-08-15 Exxonmobil Upstream Research Company Method for installing tubular members axially into an over-pressured region of the earth
US6857487B2 (en) * 2002-12-30 2005-02-22 Weatherford/Lamb, Inc. Drilling with concentric strings of casing
NO316183B1 (en) * 2002-03-08 2003-12-22 Sigbjoern Sangesland Method and apparatus for feeding tubes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005100732A1 *

Also Published As

Publication number Publication date
DE602005003118D1 (en) 2007-12-13
BRPI0509802B1 (en) 2016-03-08
ATE377129T1 (en) 2007-11-15
NO20041495D0 (en) 2004-04-13
WO2005100732A1 (en) 2005-10-27
NO320467B1 (en) 2005-12-12
CA2562891A1 (en) 2005-10-27
NO20041495L (en) 2005-10-14
EP1740793B1 (en) 2007-10-31
BRPI0509802A (en) 2007-09-18
US20080257603A1 (en) 2008-10-23

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