WO1986004950A1 - Drilling pipe for making a drill string - Google Patents

Drilling pipe for making a drill string Download PDF

Info

Publication number
WO1986004950A1
WO1986004950A1 PCT/NO1986/000019 NO8600019W WO8604950A1 WO 1986004950 A1 WO1986004950 A1 WO 1986004950A1 NO 8600019 W NO8600019 W NO 8600019W WO 8604950 A1 WO8604950 A1 WO 8604950A1
Authority
WO
WIPO (PCT)
Prior art keywords
drilling
drilling pipe
tubes
drill string
ribs
Prior art date
Application number
PCT/NO1986/000019
Other languages
French (fr)
Inventor
Henning Narum
Sigbjo^/rn SANGESLAND
Original Assignee
A/S Raufoss Ammunisjonsfabrikker
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 A/S Raufoss Ammunisjonsfabrikker filed Critical A/S Raufoss Ammunisjonsfabrikker
Publication of WO1986004950A1 publication Critical patent/WO1986004950A1/en

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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • 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

Definitions

  • Drilling pipe for making a drill string Drilling pipe for making a drill string.
  • the present invention relates to drilling pipes for making a drill string, in particular adapted to deviation drilling, i.e. drilling performed in such a manner that the drilling direction at the beginning is substantially vertical, while the direction is later changed towards one side, so that the direction of drilling finally is under a larger or smaller angle with the vertical direction, up to 90°.
  • Such drilling allows drilling into several mutually separate sources from one point , and is used for offshore drilling.
  • Deviation drilling causes, however, and in particular when the deviation angle from the vertical direction is large, problems with respect to transporting of the cuttings. Moreover, the friction against the bore hole becomes large, and the weight on the drill bit may be insufficient. Generally the weight of a conventional drill string will be a problem when the more or less horizontal portion of the bore hole has a large length.
  • a large deviation angle means that the cuttings have a short way to "fall” until they reach the "bottom” of the hole.
  • the weight of the drill string will generally be proportional to the frictional forces and frictional torques which occur between the drill string and the wall of the hole. In long holes having a large deviation angle said forces and torques will be of importance, and they will determine the possible length of drilling until the friction becomes too large.
  • the object of the present invention is to provide a drilling pipe which makes it possible to reduce the frictional forces and the frictional torques and which simultaneously keeps the pressure losses and the operational and handling conditions within acceptable limits.
  • the above has been achieved with a drilling pipe as specified in the accompanying claims.
  • a buoyancy which causes that the pressure of the drill string against the under side of a more or less horizontal portion of a hole is reduced.
  • the drilling pipe is made of an inner and an outer tube, and the inner tube has ribs which maintain the distance from the outer tube and contribute to prevent that the outer tube is squeezed together by the outer pressure.
  • At least the outer tube is helical.This brings about a reduction of the contact surface of the drill pipe against the wall of the hole and reduced problems related to friction between the drill string and the wall of the hole.
  • drilling pipes according to the invention does not have to comprise drilling pipes according to the invention,because these may be combined with drilling pipes without cavities for buoyancy.
  • Conventional drilling pipes may for instance be used during the first phase of the drilling, when the transporting of cuttings and the frictional forces are small problems, and drilling pipes according to the invention may be used in the area where the major deviation takes place.
  • the buoyance chamber or channels may be permanemtly closed, and the cross section of the chamber or the channels is of course adapted to the desired buoyancy, taking into account the weight of the drilling mud which determines the buoyancy per unit of volume.
  • Fig. 1 shows a longitudinal section through an originally straight drilling pipe according to the invention.
  • Fig.2 shows a cross section through a drilling pipe according to the invention.
  • Fig. 3 shows a longitudinal section through a drilling pipe according to the invention, in which the outer tube is of helical shape, while the inner tube primarily is straight.
  • the shown drilling pipes are sections which are adapted to form a drill string by being joined, and they may, as mentioned, provide a combination together with sections which have no cavities for buoyancy.
  • the drilling pipe shown in Fig.1 consists of an outer tube 1 and an inner tube 2, and said tubes are concentrical and are spaced radially by means of ribs 3.
  • a head 4,5 On each end of the drilling pipe is a head 4,5, which may have outer and inner threads, respectively, for screwing together of drilling pipes to form a string.
  • the tubes 1 and 2 may have cross sections as shown in Fig. 2, where the tube 1 has smooth walls while the tube 2 has outer ribs 3.
  • Fig.3 shows an embodiment where the outer tube 1 is of helical shape, while the inner tube 2 is straight.
  • the drilling pipe shown in Fig.3 has heads 4 and 3, in the same manner as the drilling pipe shown in Fig.1, and ribs 3 maintain the distance between the tubes 1 and 2. In this case, however, the ribs 3 have a height which varies with the distance between the tubes 1 and 2.
  • a not shown modification is a drilling pipe of which both the outer tube 1 and the inner tube 2 have helical shape.
  • the heads 4 and 5 may be of conventional type, and are not closer described.
  • the tubes 1 and 2 may be made of aluminium. It is theoretically possible to extrude the tubes 1 and 2 and the ribs 3 together, but because of the compression loading to which the tubes are subjected it is considered necessary to use heavily extrudable alloys , which makes it necessary to manufacture the tubes 1 and 2 separately, whereupon the tubes are joined. The joining may be performed in different ways, of which are mentioned:
  • Explosive technology for instance placing of a detonating fuse around the tube 1, whereby the detonation will press the ribs 3 into the wall of the tube 1.
  • the above processes may also be used when the outer tube is of helical shape, as shown in Fig.2. If both the tubes are of helical shape the inner tube must be screwed into the outer one after giving both the tubes their shape. Thereupon one of the above mentioned processes may be used. Alternatively the two tubes may be moved together in straight condition, whereupon they are given a helical shape.
  • a drilling pipe according to the invention contains a closed chamber or a plurality of channels which are closed against the exterior. There is no hindrance of providing mutually communicating channels, but grounds of manufacture make it most appropriate that the channels are separate.
  • the cavity or the channels for buoyanca may as mentioned contain air, but also other media can be used, such as a liquid or a more or less solid mass. Also another gas than air may be used.
  • the invention makes it possible , in particular when the mud weight is relatively high, to achieve a "positive" buoyancy. Compared with conventional drilling pipes o f aluminium the invention makes it possible to achieve a substantial weight reduction, for instance by a factor in the range of 3, and relatively to conventional drilling pipes of steel there may be achieved a weight reduction by a factor in the range o f 7 ( I . e . approximately 1 /3 and 1 /7 , respectively, of the weight of conventional drilling pipes ) .
  • the joining of the tubes 1 and 2 and the heads 4 and 3 may be performed in any suitable manner. As examples are mentioned threaded connections and welding.
  • the inner tube which is adapted to convey mud, of course communicates with apertures in the heads 4 and 5, in such a manner that a plurality of joined drilling pipes constitute a string having a continuous inner channel.
  • the tubes 1 and 2 must be designed for the prevailing pressures, they must also be designed to withstand the bending which necessarily occurs during deviated drilling, and the tubes must furthermore be designed to withstand the axial forces and the torque to which they are subjected.

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

Drilling pipe for making of a drill string, in particular for deviation drilling, comprising an outer tube (1) and an inner tube (2) connected to heads (4, 5) on each end, in such a manner that the inner tube communicates with apertures through each head, and in such a manner that a closed cavity is constituted between the tubes (1, 2), said cavity contributing to give the drilling pipe and the drill string a buoyancy in the bore hole.

Description

Drilling pipe for making a drill string.
The present invention relates to drilling pipes for making a drill string, in particular adapted to deviation drilling, i.e. drilling performed in such a manner that the drilling direction at the beginning is substantially vertical, while the direction is later changed towards one side, so that the direction of drilling finally is under a larger or smaller angle with the vertical direction, up to 90°.
Such drilling allows drilling into several mutually separate sources from one point , and is used for offshore drilling.
Deviation drilling causes, however, and in particular when the deviation angle from the vertical direction is large, problems with respect to transporting of the cuttings. Moreover, the friction against the bore hole becomes large, and the weight on the drill bit may be insufficient. Generally the weight of a conventional drill string will be a problem when the more or less horizontal portion of the bore hole has a large length.
The problem of transporting the cuttings will increase with the deviation angle and the length of the hole. A large deviation angle means that the cuttings have a short way to "fall" until they reach the "bottom" of the hole.
The weight of the drill string will generally be proportional to the frictional forces and frictional torques which occur between the drill string and the wall of the hole. In long holes having a large deviation angle said forces and torques will be of importance, and they will determine the possible length of drilling until the friction becomes too large.
The object of the present invention is to provide a drilling pipe which makes it possible to reduce the frictional forces and the frictional torques and which simultaneously keeps the pressure losses and the operational and handling conditions within acceptable limits. In accordance with the invention the above has been achieved with a drilling pipe as specified in the accompanying claims.
With a drilling pipe according to the invention is achieved a buoyancy, which causes that the pressure of the drill string against the under side of a more or less horizontal portion of a hole is reduced.
According to an embodiment the drilling pipe is made of an inner and an outer tube, and the inner tube has ribs which maintain the distance from the outer tube and contribute to prevent that the outer tube is squeezed together by the outer pressure.
According to another embodiment at least the outer tube is helical.This brings about a reduction of the contact surface of the drill pipe against the wall of the hole and reduced problems related to friction between the drill string and the wall of the hole.
It is to be noted that the entire drill string does not have to comprise drilling pipes according to the invention,because these may be combined with drilling pipes without cavities for buoyancy. Conventional drilling pipes may for instance be used during the first phase of the drilling, when the transporting of cuttings and the frictional forces are small problems, and drilling pipes according to the invention may be used in the area where the major deviation takes place.
The buoyance chamber or channels may be permanemtly closed, and the cross section of the chamber or the channels is of course adapted to the desired buoyancy, taking into account the weight of the drilling mud which determines the buoyancy per unit of volume.
In the following the invention will be explained closer, with reference to the accompanying drawings.
Fig. 1 shows a longitudinal section through an originally straight drilling pipe according to the invention. Fig.2 shows a cross section through a drilling pipe according to the invention.
Fig. 3 shows a longitudinal section through a drilling pipe according to the invention, in which the outer tube is of helical shape, while the inner tube primarily is straight.
The shown drilling pipes are sections which are adapted to form a drill string by being joined, and they may, as mentioned, provide a combination together with sections which have no cavities for buoyancy.
The drilling pipe shown in Fig.1 consists of an outer tube 1 and an inner tube 2, and said tubes are concentrical and are spaced radially by means of ribs 3. On each end of the drilling pipe is a head 4,5, which may have outer and inner threads, respectively, for screwing together of drilling pipes to form a string.
The tubes 1 and 2 may have cross sections as shown in Fig. 2, where the tube 1 has smooth walls while the tube 2 has outer ribs 3.
Fig.3 shows an embodiment where the outer tube 1 is of helical shape, while the inner tube 2 is straight. The drilling pipe shown in Fig.3 has heads 4 and 3, in the same manner as the drilling pipe shown in Fig.1, and ribs 3 maintain the distance between the tubes 1 and 2. In this case, however, the ribs 3 have a height which varies with the distance between the tubes 1 and 2.
A not shown modification is a drilling pipe of which both the outer tube 1 and the inner tube 2 have helical shape.
The heads 4 and 5 may be of conventional type, and are not closer described.
The tubes 1 and 2 may be made of aluminium. It is theoretically possible to extrude the tubes 1 and 2 and the ribs 3 together, but because of the compression loading to which the tubes are subjected it is considered necessary to use heavily extrudable alloys , which makes it necessary to manufacture the tubes 1 and 2 separately, whereupon the tubes are joined.The joining may be performed in different ways, of which are mentioned:
Stretching of the tube 1 until it comes into pressure contact with the ribs 3.
Pulling of a plunger through the tube 2, in order to bring the ribs 3 into pressure contact with the tube 1.
The use of a temperature difference between the tubes 1 and 2 and moving the tubes 1 and 2 together, followed by the above mentioned stretching or pulling of a plunger.
Explosive technology, for instance placing of a detonating fuse around the tube 1, whereby the detonation will press the ribs 3 into the wall of the tube 1.
The manufacture, however, does not constitute any limitation with respect to the scope of the invention, and is merely mentioned as examples of possibilities.
The above processes may also be used when the outer tube is of helical shape, as shown in Fig.2. If both the tubes are of helical shape the inner tube must be screwed into the outer one after giving both the tubes their shape. Thereupon one of the above mentioned processes may be used. Alternatively the two tubes may be moved together in straight condition, whereupon they are given a helical shape.
A drilling pipe according to the invention contains a closed chamber or a plurality of channels which are closed against the exterior. There is no hindrance of providing mutually communicating channels, but grounds of manufacture make it most appropriate that the channels are separate.
The cavity or the channels for buoyanca may as mentioned contain air, but also other media can be used, such as a liquid or a more or less solid mass. Also another gas than air may be used. The invention makes it possible , in particular when the mud weight is relatively high, to achieve a "positive" buoyancy. Compared with conventional drilling pipes o f aluminium the invention makes it possible to achieve a substantial weight reduction, for instance by a factor in the range of 3, and relatively to conventional drilling pipes of steel there may be achieved a weight reduction by a factor in the range o f 7 ( I . e . approximately 1 /3 and 1 /7 , respectively, of the weight of conventional drilling pipes ) .
It will be appreciated that the joining of the tubes 1 and 2 and the heads 4 and 3 may be performed in any suitable manner. As examples are mentioned threaded connections and welding. The inner tube , which is adapted to convey mud, of course communicates with apertures in the heads 4 and 5, in such a manner that a plurality of joined drilling pipes constitute a string having a continuous inner channel.
In addition to the fact that the tubes 1 and 2 must be designed for the prevailing pressures, they must also be designed to withstand the bending which necessarily occurs during deviated drilling, and the tubes must furthermore be designed to withstand the axial forces and the torque to which they are subjected.

Claims

Claims.
1. Drilling pipe for making a drill string, in particular for deviation drilling, characterized in that it comprises an outer tube (1) and an inner tube (2) which are connected to heads (4,5) on each end, in such a manner that the inner tube (2) communicates with apertures through each head, and such that a closed cavity is constituted between the tubes (1,2).
2. Drilling pipe according to claim 1 , characterized in that ribs (3) are provided in said cavity, in order to maintain the radial distance between the tubes.
3. Drilling pipe according to claim 2, characterized in that the ribs (3) are made integrally with one of the tubes (1,2).
4. Drilling pipe according to claim 3, characterized in that the ribs (3) are exterior ribs on the inner tube (2).
5. Drilling pipe according to claims 1 to 4, characterized in in that at least the outer tube (1) is of helical shape.
PCT/NO1986/000019 1985-02-21 1986-02-21 Drilling pipe for making a drill string WO1986004950A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO850689 1985-02-21
NO850689 1985-02-21

Publications (1)

Publication Number Publication Date
WO1986004950A1 true WO1986004950A1 (en) 1986-08-28

Family

ID=19888133

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1986/000019 WO1986004950A1 (en) 1985-02-21 1986-02-21 Drilling pipe for making a drill string

Country Status (2)

Country Link
EP (1) EP0211925A1 (en)
WO (1) WO1986004950A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2226583A (en) * 1988-12-30 1990-07-04 Shell Int Research Method of placing a pipe string in a borehole and pipe section for use in the method
EP0532324A1 (en) * 1991-09-13 1993-03-17 Inco Limited In-the-hole drill inner tube rod
EP0580271A2 (en) * 1992-07-24 1994-01-26 The Charles Machine Works Inc Drill pipe
US5713423A (en) * 1992-07-24 1998-02-03 The Charles Machine Works, Inc. Drill pipe
WO1998032951A3 (en) * 1997-01-28 1998-10-01 Wirth Co Kg Masch Bohr Method and device for driving bore-holes, especially in the sea bed, using a guide tip
WO2002012773A1 (en) * 2000-08-08 2002-02-14 Oil States Industries (Uk) Ltd Pipe assembly
WO2018046757A3 (en) * 2016-09-12 2018-04-19 Koegler Ruediger Extended directional drilling
GB2566779A (en) * 2017-05-03 2019-03-27 Hunting Energy Services Inc One piece forged fludic displacement drill pipe and method of manufacture thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1024310A (en) * 1911-10-14 1912-04-23 Roger H Canfield Apparatus for boring wells.
DE816464C (en) * 1942-11-08 1951-10-11 Wieland Werke Ag Metallic hollow tube
US3552779A (en) * 1968-05-31 1971-01-05 Homer I Henderson Dual-conduit drill pipe for earth boring
US3786878A (en) * 1970-08-25 1974-01-22 H Sherman Dual concentric drillpipe
GB1461003A (en) * 1973-08-29 1977-01-13 Bakerdrill Inc Dual concentric drill pipe
DE3239342A1 (en) * 1982-10-23 1984-04-26 Schmidt, Kranz & Co GmbH Zweigniederlassung Zorge, 3421 Zorge Drill column
CA1191454A (en) * 1983-01-19 1985-08-06 Harold F. Jarvis Insulated tubular structure

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1024310A (en) * 1911-10-14 1912-04-23 Roger H Canfield Apparatus for boring wells.
DE816464C (en) * 1942-11-08 1951-10-11 Wieland Werke Ag Metallic hollow tube
US3552779A (en) * 1968-05-31 1971-01-05 Homer I Henderson Dual-conduit drill pipe for earth boring
US3786878A (en) * 1970-08-25 1974-01-22 H Sherman Dual concentric drillpipe
GB1461003A (en) * 1973-08-29 1977-01-13 Bakerdrill Inc Dual concentric drill pipe
DE3239342A1 (en) * 1982-10-23 1984-04-26 Schmidt, Kranz & Co GmbH Zweigniederlassung Zorge, 3421 Zorge Drill column
CA1191454A (en) * 1983-01-19 1985-08-06 Harold F. Jarvis Insulated tubular structure

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2226583A (en) * 1988-12-30 1990-07-04 Shell Int Research Method of placing a pipe string in a borehole and pipe section for use in the method
EP0532324A1 (en) * 1991-09-13 1993-03-17 Inco Limited In-the-hole drill inner tube rod
EP0580271A2 (en) * 1992-07-24 1994-01-26 The Charles Machine Works Inc Drill pipe
EP0580271A3 (en) * 1992-07-24 1994-05-04 Charles Machine Works
US5713423A (en) * 1992-07-24 1998-02-03 The Charles Machine Works, Inc. Drill pipe
WO1998032951A3 (en) * 1997-01-28 1998-10-01 Wirth Co Kg Masch Bohr Method and device for driving bore-holes, especially in the sea bed, using a guide tip
US6484820B1 (en) 1997-01-28 2002-11-26 Wirth Maschinen-Und Bohrgeraete Fabrik Gmbh Method and device for driving bore-holes, especially in the sea bed, using a guide tip
WO2002012773A1 (en) * 2000-08-08 2002-02-14 Oil States Industries (Uk) Ltd Pipe assembly
WO2018046757A3 (en) * 2016-09-12 2018-04-19 Koegler Ruediger Extended directional drilling
GB2566779A (en) * 2017-05-03 2019-03-27 Hunting Energy Services Inc One piece forged fludic displacement drill pipe and method of manufacture thereof
US10407996B2 (en) 2017-05-03 2019-09-10 Hunting Energy Services, Inc. One piece forged fluidic displacement drill pipe and method of manufacture thereof
GB2566779B (en) * 2017-05-03 2022-03-30 Hunting Energy Services Inc Fluidic displacement drill pipe assembly and method of manufacture thereof

Also Published As

Publication number Publication date
EP0211925A1 (en) 1987-03-04

Similar Documents

Publication Publication Date Title
CA2221018C (en) Straight hole drilling system
JP4406512B2 (en) Screw shape with multifaceted flank
US3355192A (en) Threaded connections
US5066052A (en) Threaded pipe joint having improved seal ring entrapment
US4707001A (en) Liner connection
CA2185251C (en) Threaded joint for tubes
US4113290A (en) Pressure tight joint for a large diameter casing
US10370944B2 (en) Perforating gun with a holding system for hollow charges for a perforating gun system
JP4111386B2 (en) Fatigue resistant screw elements for threaded pipe joints
US4549616A (en) Rock drill
WO1986004950A1 (en) Drilling pipe for making a drill string
US4706355A (en) Method of making an internally grooved and expanded tubular heat exchanger apparatus
US4944538A (en) Threaded pipe joint having improved seal ring entrapment
US1746132A (en) Drill pipe
WO1984002158A1 (en) A method employed in long-hole drilling and a drill rod system
US5259547A (en) Method of manufacturing bi-metallic tubing
US6808210B1 (en) Drill pipe with upset ends having constant wall thickness and method for making same
WO1986004951A1 (en) Drilling pipe for making a drill string
EP3356607B1 (en) Pile
CA2303710C (en) Straight hole drilling system
CN214576803U (en) Integral heat insulation oil pipe column structure
AU722409B3 (en) Straight hole drilling system
CN2734993Y (en) Interlayered gun as perforator for oil-gas well
AU4505500A (en) Straight hole drilling system
US4505343A (en) Plural-part earth bit, and an improved bit head therefor

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): DE FR GB IT NL SE