EP0768446A1 - Procédé et outil de forage pour le forage de puits dans les formations souterraines - Google Patents

Procédé et outil de forage pour le forage de puits dans les formations souterraines Download PDF

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Publication number
EP0768446A1
EP0768446A1 EP95115867A EP95115867A EP0768446A1 EP 0768446 A1 EP0768446 A1 EP 0768446A1 EP 95115867 A EP95115867 A EP 95115867A EP 95115867 A EP95115867 A EP 95115867A EP 0768446 A1 EP0768446 A1 EP 0768446A1
Authority
EP
European Patent Office
Prior art keywords
drilling
outer housing
borehole
drill bit
formation
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
EP95115867A
Other languages
German (de)
English (en)
Other versions
EP0768446B1 (fr
Inventor
Friedhelm Dipl.-Ing. Makohl
Carsten Dipl.-Ing. Vogt
Pudjihanto Surwano
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.)
Baker Hughes Holdings LLC
Original Assignee
Baker Hughes Inc
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 Baker Hughes Inc filed Critical Baker Hughes Inc
Priority to DE59508569T priority Critical patent/DE59508569D1/de
Priority to EP95115867A priority patent/EP0768446B1/fr
Priority to NO19964272A priority patent/NO311046B1/no
Priority to US08/729,226 priority patent/US5845722A/en
Publication of EP0768446A1 publication Critical patent/EP0768446A1/fr
Priority to US09/205,969 priority patent/US6196336B1/en
Application granted granted Critical
Publication of EP0768446B1 publication Critical patent/EP0768446B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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 invention relates to a method and a device for sinking a borehole into underground formations with at least one layer-like special formation which has significantly different formation pressures than a formation adjacent in the sinking direction.
  • a borehole which is initially sunk in a first formation with a first formation pressure, meets a formation with a significantly higher formation pressure, then there is a risk of in-formation media flowing into the drilling fluid, through which drilling fluid can be pressed out of the annulus and the pipe string above ground . If the weight of the drilling fluid is increased, which can be carried out by introducing heavy spar or iron oxide to the drilling fluid in order to compensate for the high pressure of the drilled formation, then drilling fluid losses occur in the first.
  • the invention is concerned with the problem of providing a method and a drilling device which avoid the above disadvantages when drilling wells into underground formations with considerable differences in formation pressure.
  • the invention solves the problem by a method according to claim 1 and by a drilling device according to claim 9.
  • the outer housing forms a shield from the formation, which prevents the occurrence of inflows as well as pushing formation areas towards the drilling tool and pipe string.
  • the drilling system schematically illustrated in Fig. 1 for the sinking of a hole in underground formations comprises an above-ground drilling rig 1 with conventional equipment, from which extends into a borehole 2 a pipe string 3 composed of screwed pipe sections, the lower end of which in the usual way with connecting threads a drilling tool 4 is connected.
  • a compensating and pressure device 6 titanium
  • a compensating and pressure device 6 can be screwed in between the pipe string end 5 and the drilling tool 4, with the aid of which primarily thermally-induced length differences can be compensated for while maintaining or presetting a desired pressure force from the bit.
  • the drilling tool 4 comprises a tool housing 7 composed of screwed pipe sections and a deep-hole motor 8 of any suitable known design, which is accommodated therein and is only indicated schematically, the output shaft 9 of which is screwed to a drill bit 10 at its lower end.
  • the system shown in FIG. 1 further comprises an outer casing 11 surrounding the pipe string 3 and the drilling tool 4, which forms a borehole lining (liner or casing) composed of pipe sections and via a connecting device 12 (liner hanger) at its upper end to the pipe string 3 is connectable.
  • This connecting device 12 establishes a detachable connection with the tubular string 3 and enables the tubular casing 3 to be inserted and pulled out of the outer casing 11 into and out of the borehole 2.
  • the tool housing 7 is supported in the region of the lower end of the upper main part 13 of the outer housing 11 by an upper group 14 of control members against downward movement, and the drive shaft 9 is in the region of a thickened section 15 by a lower group 16 of locking members with a lower separate one End part 17 of the outer housing 11 connected, which is independently rotatably mounted on a lower end portion 18 of the main part 13 of the outer housing 11 and can rotate with the drive shaft 9 about the common longitudinal central axis 19 of the drilling device.
  • the lower end part 17 carries on the end face a drill bit 20, the cutting plane of which assumes an initial position approximately at the level of the cutting plane of the drill bit 10.
  • the upper group 14 of the locking members is formed by a locking groove 21 formed in the outer housing 11 in the form of an outwardly shaped annular pocket and locking bars 22 which are fixed to the tool housing 7 by means of screws 23 at one end and with their free part from a recessed starting position can be elastically deflected by the action of a spring 24 into a locking position, in which the locking strips 22 engage in the locking grooves 21 in a rotationally fixed manner.
  • the locking ledges 22 rest with their free lower end on the pocket bottom 21 'in the fastening of their upper end shown; if the locking bars 22 can also be fastened at their lower end, the support is provided by a projection of the engagement part 25 at the upper free end of the locking bars 22 on the pocket bottom 21 '.
  • the locking bars 22 are stressed in this case. At least three bars are provided on locking ledges 22, which are regularly distributed over the circumference of the outer housing 11 or the tool housing 7.
  • the lower group 16 of the locking members is formed by longitudinal locking grooves 26 formed in the lower end part 17 of the outer housing 11 in the form of trough-shaped pockets and by locking strips 27 fixed to the thickened section 15 of the drive shaft 9 of the deep hole motor 8 by means of screws 23, which are also can be elastically deflected from a lowered starting position by the action of a spring 28 into a locking position, in which engaging parts 29 of the locking strips 27 engage in the locking grooves 26.
  • the lower group 16 comprises at least three pairs of locking grooves 26 and locking strips 27, which are arranged at equal angles over the circumference of the outer housing 11 or drive shaft 9. Instead of the illustrated attachment of the locking bars 27 with an attachment point above and the lower free end, these can also be attached with the upper free end and the fastening point located below.
  • the locking groove 21 of the upper group 14 is designed with an engagement length that is shorter than the engagement length of the engagement parts 29 of the locking bars 27 of the lower Group 16. This ensures that the engaging parts 29 of the locking bars 27 of the lower group 16 can only fall into the locking grooves 26 of the lower group 16 intended for them.
  • the locking grooves 26 of the lower group 16 have an engagement length which is greater than that of the engaging parts 29 of the locking strips 27 of the lower group 16. This ensures that the lower end part 17 of the outer housing 11 in the axial direction relative to the drive shaft 9 between two End positions can shift, as illustrated in FIGS. 2 and 3.
  • the upper end position shown in FIG. 3 forms the drilling operating position in which the cutting plane of the drill bit 20 is offset upwards from that of the drill bit 10 and surrounds the drill bit 10 in the region of its side cutting surface. This creates a better drainage of drilling fluid and cuttings.
  • a bearing sleeve 30 is provided, which is inserted from above into the lower end part 17 of the outer housing 11 and is firmly connected, for example screwed, to it.
  • the lower end section 18 of the upper main part 13 of the outer housing 11 encompasses the bearing sleeve 30 and, with a bearing surface 31 on its inside, forms a plain bearing which is coaxial with the longitudinal central axis 19 of the drilling device.
  • the bearing sleeve 30 is in the lower end section 18 of the upper Main part 13 of the outer housing 11 is axially displaceably supported so as to enable the lower end part 17 the above-mentioned axial mobility between the starting position according to FIG. 2 and the drilling operating position according to FIG. 3.
  • the bearing sleeve 30 has a collar 32 on the outside which, as a stop in cooperation with a shoulder 33 above the bearing surface 31, defines the lower end position for the lower end part 17 of the outer housing 11.
  • the drilling operating position is defined by the lower end of the locking bars 27, which cooperate with a counter surface 34 as a stop, which in the example shown is formed by the end face of the screwed-in lower section 35 of the lower end part 17 of the outer housing 11, which is located in the upper ones above Section 36 of the lower end part 17 of the outer housing 11 is screwed.
  • the design of the drilling device according to FIG. 5 enables directional drilling to be carried out in underground formations.
  • This is made possible by the fact that when the outer housing 11 is otherwise unchanged, the lower end section 18 of the upper main part 13 of the outer housing 11 is oriented at an acute angle 37 of, for example, 1-3 ° to the main part 13 located above it. This can be achieved, for example, by an angular alignment of the thread 38 at the lower end of the main part 13 of the outer housing 11, onto which the lower end section 18 is screwed.
  • a separate angle piece can also be provided as an intermediate part that can be screwed in place.
  • the drive shaft 9 of the deep-hole motor 8 is provided with a section 39 of increased flexibility in the form of a circumferential, the bending resistance reducing contraction, otherwise the training of the drilling tool 4 is unchanged downward adjoining part of the drive shaft 9 gives an all-round elastic deflectability.
  • the flexible section 39 is located slightly below the bend 40 at which the longitudinal central axis 19 of the drilling device merges into the angled lower axis part 19 '.
  • any type of bit can be used as the drill bit 10. It is essential, however, that the drill bit 10 is provided with a stabilizer part 10 ', which is at a close distance from the inside of the lower section 35 of the lower end part 17, and has a side cutting surface which, for example by grinding, has a high accuracy of fit and with a close fit Can drill through 20.
  • first formation extends down into the vicinity of the border area to a special formation following in the direction of the sinking, in which the formation pressure is substantially higher or lower than it is in the region of the first formation.
  • This first formation with largely the same first formation pressure can have an essentially homogeneous structure, but can also consist of several different ones There are partial formations between which there are no significant formation pressure differences.
  • the normal drilling tool is drawn up and the outer housing 11 is inserted into the borehole 2, the length of the housing being such that it exceeds the predetermined thickness of the subsequent special formation.
  • This special formation can be, for example, one with high formation pressure, as is the case, for example, with cover layers above gas or oil storage layers.
  • the drilling tool 4 As soon as the drilling tool 4 is set down and locked in the outer housing 11, the upper end of the outer housing 11 is connected to the pipe string 3 by means of the connecting device 12, which can have any suitable known design, and then released from the support on the drilling tower side.
  • the unit of parts 3, 4 and 11 thus formed is now under Further construction of the pipe string 3 continues into the first part of the borehole 2 until the drill bit 10 and the drill bit 11 reach the bottom of the borehole 2.
  • the drilling tool 4 is then put into operation, which is done by switching on or starting the deep hole motor 8, which is started up, for example when it is designed as a turbine or Moineau motor, by supplying it with drilling fluid.
  • the tubular outer casing 11 is carried along by the tubular string 3, whereby the rotating core bit 20 at the lower end of the outer casing 11 in turn acts like a drilling tool.
  • the outer casing 11 lines the borehole 2 in the region of its length, absorbs inward formation forces as soon as these become effective, for example when there is a drop in pressure in the drilling fluid, and brings about a seal which can optionally be further perfected by cementing in.
  • the drilling tool can be opened after loosening the connecting device 12 and the bore can be used as a production bore, for example after complete lining. If the borehole is to be given a course that extends far beyond the special formation, after the drilling tool 4 previously connected to the outer housing 11 has been pulled up, a second drilling tool together with the pipe string can be inserted into the hole Borehole are retracted, which can be passed through the offset outer housing and can take over the further drilling of the hole. If a further special formation is to be drilled through at a considerable distance from the first special formation, a further drilling device with a second outer housing can be used, which can be passed through the stepped first outer housing. The sequence of the drilling process with the second drilling device is then analogous to the previously described sequence.
  • the upper main part 13 of the outer housing 11 is advantageously set in rotation by the tubing string 3 for the purpose of reducing friction or for guiding the drilling tool 4 straight. If the outer housing 11 is angled in its lower area and the drill can thus be used for directional drilling operations, after determining the direction of the angled part of the outer housing 11, this is secured against twisting by the pipe string 3 from above, so that as drilling continues, an in its direction is drilled in accordance with changed borehole part.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (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)
  • Earth Drilling (AREA)
EP95115867A 1995-10-09 1995-10-09 Procédé et outil de forage pour le forage de puits dans les formations souterraines Expired - Lifetime EP0768446B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE59508569T DE59508569D1 (de) 1995-10-09 1995-10-09 Verfahren und Bohrgerät zum Abteufen von Bohrungen in unterirdische Formationen
EP95115867A EP0768446B1 (fr) 1995-10-09 1995-10-09 Procédé et outil de forage pour le forage de puits dans les formations souterraines
NO19964272A NO311046B1 (no) 1995-10-09 1996-10-08 Fremgangsmate og boreinnretning til utdyping av borehull i underjordiske formasjoner
US08/729,226 US5845722A (en) 1995-10-09 1996-10-09 Method and apparatus for drilling boreholes in earth formations (drills in liner systems)
US09/205,969 US6196336B1 (en) 1995-10-09 1998-12-04 Method and apparatus for drilling boreholes in earth formations (drilling liner systems)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95115867A EP0768446B1 (fr) 1995-10-09 1995-10-09 Procédé et outil de forage pour le forage de puits dans les formations souterraines

Publications (2)

Publication Number Publication Date
EP0768446A1 true EP0768446A1 (fr) 1997-04-16
EP0768446B1 EP0768446B1 (fr) 2000-07-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95115867A Expired - Lifetime EP0768446B1 (fr) 1995-10-09 1995-10-09 Procédé et outil de forage pour le forage de puits dans les formations souterraines

Country Status (4)

Country Link
US (1) US5845722A (fr)
EP (1) EP0768446B1 (fr)
DE (1) DE59508569D1 (fr)
NO (1) NO311046B1 (fr)

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US6106200A (en) * 1996-11-12 2000-08-22 Techmo Entwicklungs-Und Vertriebs Gmbh Process and device for simultaneously drilling and lining a hole
US5957225A (en) * 1997-07-31 1999-09-28 Bp Amoco Corporation Drilling assembly and method of drilling for unstable and depleted formations
US6536520B1 (en) 2000-04-17 2003-03-25 Weatherford/Lamb, Inc. Top drive casing system
US6529834B1 (en) 1997-12-04 2003-03-04 Baker Hughes Incorporated Measurement-while-drilling assembly using gyroscopic devices and methods of bias removal
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EP0265344A1 (fr) * 1986-10-22 1988-04-27 SOLETANCHE Société Anonyme dite: Procédé pour la réalisation d'un pieu dans le sol, machine de forage et dispositif pour la mise en oeuvre de ce procédé
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EP0462618A2 (fr) * 1990-06-21 1991-12-27 EVI Cherrington Environmental, Inc. Procédé et dispositif de forage horizontal
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DE3839760C1 (en) * 1988-11-25 1990-01-18 Gewerkschaft Walter Ag Double rotary drilling apparatus for making directionally accurate bores, in particular horizontal bores
DE3902868C1 (fr) * 1989-02-01 1990-06-07 Eastman Christensen Co., Salt Lake City, Utah, Us
EP0462618A2 (fr) * 1990-06-21 1991-12-27 EVI Cherrington Environmental, Inc. Procédé et dispositif de forage horizontal
US5197553A (en) * 1991-08-14 1993-03-30 Atlantic Richfield Company Drilling with casing and retrievable drill bit
US5186265A (en) * 1991-08-22 1993-02-16 Atlantic Richfield Company Retrievable bit and eccentric reamer assembly

Also Published As

Publication number Publication date
EP0768446B1 (fr) 2000-07-12
DE59508569D1 (de) 2000-08-17
NO964272L (no) 1997-04-10
NO311046B1 (no) 2001-10-01
NO964272D0 (no) 1996-10-08
US5845722A (en) 1998-12-08

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