EP0241354A1 - Vorrichtung zum gleichzeitigen Bohren und Verrohren - Google Patents

Vorrichtung zum gleichzeitigen Bohren und Verrohren Download PDF

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Publication number
EP0241354A1
EP0241354A1 EP87400713A EP87400713A EP0241354A1 EP 0241354 A1 EP0241354 A1 EP 0241354A1 EP 87400713 A EP87400713 A EP 87400713A EP 87400713 A EP87400713 A EP 87400713A EP 0241354 A1 EP0241354 A1 EP 0241354A1
Authority
EP
European Patent Office
Prior art keywords
drilling
casing
crown
casing section
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.)
Granted
Application number
EP87400713A
Other languages
English (en)
French (fr)
Other versions
EP0241354B1 (de
Inventor
Jean Pierre Parant
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.)
Societe National Elf Aquitaine
Societe Nationale Elf Aquitaine Production SA
Original Assignee
Societe National Elf Aquitaine
Societe Nationale Elf Aquitaine Production SA
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 Societe National Elf Aquitaine, Societe Nationale Elf Aquitaine Production SA filed Critical Societe National Elf Aquitaine
Publication of EP0241354A1 publication Critical patent/EP0241354A1/de
Application granted granted Critical
Publication of EP0241354B1 publication Critical patent/EP0241354B1/de
Expired 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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/20—Drives for drilling, used in the borehole combined with surface drive
    • 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
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • E21B7/208—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes using down-hole drives

Definitions

  • the present invention relates to a simultaneous drilling and casing device.
  • drilling is done first to a certain depth, then the casing is lowered and anchored to the ground by cementing.
  • the known methods are not suitable for horizontal drilling.
  • the object of the present invention is to remedy these drawbacks by proposing a method aimed at the simultaneous laying of the casing as the drilling progresses, by endowing the end of the casing with a drilling string which is spawning its same parallel path, since it is rotated.
  • the simultaneous drilling and casing device usable after the installation of a first casing section, either by conventional means, or by application of this device, followed by cementing, on an already drilled part of the well is characterized in that the drill stand, driven in rotation by the rotation table and provided with hollow rods, has at its lower end a drilling tool driven by a downhole motor and, in its intermediate part, a drive connector with which is secured by screwing the rear end of a casing section, the front end of said section being provided with a abrasive lining ring, the length of the part of the drill string separating the drive fitting from the drilling tool being substantially equal to the length of the casing section.
  • the drill string comprises, as usual, hollow drill rods which are driven by the rotation table.
  • a drill string not shown, carries at its end a drive connector 10 made of mild steel to which it is fixed by means of the end 11 of said connector.
  • the central part of the connector 10 carries an external thread 12. By means of this thread is screwed the rear part 1a of a casing section 1 provided with an internal thread.
  • the rear part 1a has, for reasons of solidity, a thickness greater than that of the remaining part of the section 1.
  • a hard steel ring 13 fixed to the connector by means of a pin 14. This ring bears on a shoulder 15 which has the upper part of the raccored. Between the ring 13 and the thread 12 is a seal 16.
  • the slide 19 is followed by two drill collars 20. At the end of each drill collar is inserted a short hollow rod coated with a sleeve 21 of hard rubber with a diameter large enough to allow centering and the recovery of torque in favor of the casing rotating at the same speed as the drill stand.
  • a bottom motor 22 rotated by a hydraulic fluid circulating in the hollow rods of the column and comprising, in order, an upper part of stator 23 , a stator 24 and a rotor 25.
  • the upper part 23 carries a ring with longitudinal grooves 26 serving as abutments. In fact, when the casing section 1 is correctly screwed onto the connector 10, the projecting parts of said grooves 26 bear on an internal shoulder 2 which the casing section 1 has at this level.
  • the stator 24 and the rotor 25 form a ball bearing 27.
  • a drilling tool 28 via the upper part 29 of the tool.
  • the central part of the drilling tool 28 carries a bronze centering ring 30, free to rotate and whose outside diameter is only a few tenths of a millimeter less than the inside diameter of the casing.
  • the front end of the casing section 1 carries a crown 3 with trim abrasive ture.
  • the rotor 25 is provided with vents 31 distributed concentrically and which are intended for the flow of the hydraulic fluid in front of the crown 3 to release the cutting face.
  • the distance separating the connector 10 from the drilling tool 28 is calculated in such a way that, when the screwing of the part 1a of the section 1 is correctly carried out, the projecting parts of the grooves 26 bear on the shoulder 2, the ring 30 is at the level of the crown 3 and the distance between the end of the crown 3 and that of the tool 28 takes a predetermined value.
  • the thread 12 undergoes considerable stresses during the operation of the rotational driving of the casing.
  • a hard steel ring is placed against the shoulder of this fitting so as to reduce the risk of such deformation.
  • the drive fitting 10 is a cylindrical fitting of a safety seal whose application is conventional in the field of drilling.
  • This cylindrical connection has a lower unscrewing torque than that of the conical connections by means of which the drilling rods are connected. Therefore, by exerting a torque opposite to the direction applied during drilling, we manage to separate the casing from the fitting, without the connection of the rods being affected.
  • the bronze ring 30 has an important role. Indeed, the tool driven by the rotor rotating at around 400 rpm and the crown rotating at around 40-60 rpm, it is important that there is no direct contact between the two and that the crown does not come to damage part of the drilling tool.
  • the process for implementing the device described is as follows. A part of the well having already been drilled and a section of casing 5 ending in a shoe 6 having been laid and cemented, the section of casing 1 is lowered into the borehole and the drill pipe is assembled to the surface.
  • the new casing section 1 will have a smaller diameter than that of the section 5 already laid and a drive fitting 10 is adapted accordingly.
  • said connector 10 is fixed, then all the elements of the drill string are fixed to the connector, such as the drill rod 18, the slide 19 in the extended position, the rod masses 20 followed by sleeves. 21, the downhole motor 22 and the drilling tool 28.
  • the column thus assembled is lowered inside the casing 1 and the rear part 1a of the casing 1 is screwed onto the thread 12 of the connector 10.
  • the drilling is finished, the depth drilled corresponding to the length of the section 1, the drilling is stopped and the drill string is rotated in the opposite direction to the direction of the previous rotation.
  • the drill string After unscrewing the fitting, the drill string is removed from the well so as to leave in the well only the section of casing, the end of which carries a female thread.
  • This thread then makes it possible to connect to the casing of various well treatment equipment, for example for cementing, perforation or acidification. This result is particularly advantageous, because it allows great precision in identifying the level at which one wishes to act.

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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)
EP87400713A 1986-04-02 1987-04-01 Vorrichtung zum gleichzeitigen Bohren und Verrohren Expired EP0241354B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8604678 1986-04-02
FR8604678A FR2596803B1 (fr) 1986-04-02 1986-04-02 Dispositif de forage et cuvelage simultanes

Publications (2)

Publication Number Publication Date
EP0241354A1 true EP0241354A1 (de) 1987-10-14
EP0241354B1 EP0241354B1 (de) 1989-03-29

Family

ID=9333788

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400713A Expired EP0241354B1 (de) 1986-04-02 1987-04-01 Vorrichtung zum gleichzeitigen Bohren und Verrohren

Country Status (7)

Country Link
US (1) US4842081A (de)
EP (1) EP0241354B1 (de)
CA (1) CA1274818A (de)
DE (1) DE3760084D1 (de)
FR (1) FR2596803B1 (de)
NO (1) NO177016C (de)
OA (1) OA08580A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2338009A (en) * 1998-06-04 1999-12-08 Philip Head Method for installing a well casing section

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2338009A (en) * 1998-06-04 1999-12-08 Philip Head Method for installing a well casing section
GB2338009B (en) * 1998-06-04 2000-06-21 Philip Head A method of installing the casing in a well and apparatus therefor

Also Published As

Publication number Publication date
OA08580A (fr) 1988-09-30
CA1274818A (fr) 1990-10-02
US4842081A (en) 1989-06-27
NO871368L (no) 1987-10-05
FR2596803B1 (fr) 1988-06-24
DE3760084D1 (en) 1989-05-03
EP0241354B1 (de) 1989-03-29
NO871368D0 (no) 1987-04-01
NO177016B (no) 1995-03-27
FR2596803A1 (fr) 1987-10-09
NO177016C (no) 1995-07-05

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