EP0163946A1 - Apparatus for optional straight or directional drilling underground formations - Google Patents
Apparatus for optional straight or directional drilling underground formations Download PDFInfo
- Publication number
- EP0163946A1 EP0163946A1 EP85105353A EP85105353A EP0163946A1 EP 0163946 A1 EP0163946 A1 EP 0163946A1 EP 85105353 A EP85105353 A EP 85105353A EP 85105353 A EP85105353 A EP 85105353A EP 0163946 A1 EP0163946 A1 EP 0163946A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- section
- housing
- stabiliser
- angle
- ribbed
- 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
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 32
- 230000015572 biosynthetic process Effects 0.000 title abstract description 3
- 238000005755 formation reaction Methods 0.000 title abstract description 3
- 239000003381 stabilizer Substances 0.000 claims description 55
- 239000011435 rock Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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
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- 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
- E21B7/06—Deflecting the direction of boreholes
- E21B7/068—Deflecting the direction of boreholes drilled by a down-hole drilling motor
-
- 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
- E21B7/10—Correction of deflected boreholes
Definitions
- This invention relates to apparatus for selective straight or directional drilling underground formations.
- European Patent Application No. 0085444 describes a device which is capable of being used for straight drilling or for drilling at an angle.
- the application describes a method and means for controlling the course of a bore hole during drilling.
- the method and means includes first and second stabilisers which are arranged to support the housing for a down-hole motor having an output shaft for connecting to a drill bit. At least one of the stabilisers is eccentric relative to the housing so that rotation of the housing will cause a change in the angle of the axis of the output shaft of the down-hole motor.
- first and second stabilisers which are arranged to support the housing for a down-hole motor having an output shaft for connecting to a drill bit.
- At least one of the stabilisers is eccentric relative to the housing so that rotation of the housing will cause a change in the angle of the axis of the output shaft of the down-hole motor.
- the change in angle causes stresses to be introduced into the housing which are transmitted to the drill bit causing excessive friction between the drill bit and the wall of the bore-hole. Furthermore additional strains are imposed on the stabilisers, the connections between the drill string and the housing, between the down-hole motor output shaft and the drill bit and between sections of the housing. These stresses can lead to damage and/or excessive wear of bearings.
- a device for use in underground drilling of bore-holes comprising:
- the upper and lower sections of the housing are connected to the intermediate section by angled connectors, especially threaded connectors.
- said intermediate section includes a plurality of interchangeable elements whereby the angle between the axes of the upper and lower housing sections can be preset.
- the length of the intermediate section when preset at one angle is different from the length of the intermediate section when set at a different angle.
- the lower housing section is provided with a connecting portion which is set at an angle relative to the lower section axis which is determined by the preset angle to the intermediate section.
- the position of the first and/or second stabilisers can be adjustable relative to the lower housing section and/or upper housing section respectively.
- At least the first stabiliser had adjustable eccentricity.
- Suitable stabilisers having adjustable eccentricity are described in German Patent Application No. P34 03 239.8-24.
- the device shown in Fig. 1 incorporates the concepts of European Patent Application No. 0085444 the disclosure of which is included herein by reference.
- the drilling device 2 is shown in position in a bore-hole 1. It comprises a housing 3 connected to a drill string 4 by means not shown.
- the connecting means may be a screw threaded arrangement as shown in European Patent Application No. 0085444.
- the drill string 4 is arranged to be rotated by a turntable 5 having a locking device 7 to prevent rotation of the turntable 5 and drill string 4.
- the turntable 5 and locking device 7 are mounted on a derrick 6.
- the locking device 7 controls the rotation of the drill string 4 to permit, for example continuous rotation or limited rotation for alignment purposes. When the locking device is in its locking condition it prevents rotation of the drill string 4 and the housing 3.
- the alternative embodiments of the drilling device 2, shown in Figs. 2 and 3, have, as common features, a housing 3 which consists of an upper section 9 concentric with a tool main axis 8, a lower section 10 deflected relative to the tool main axis 8, and an intermediate section 11 connecting the lower section 10 to the upper section 9.
- a motor (not shown) may be arranged in the section 9 of the housing 3.
- the motor may be of any conventional type, for example, a turbine motor, a vane motor, a Moineau type motor or an electric motor.
- the motor rotor is connected t ⁇ ⁇ a rotary drill bit 13 via a universal joint and shaft leading through the intermediate section 11 and via a driven shaft 12 mounted in the lower housing section 10.
- a stabiliser 14 is located on the lower section 10 and a stabiliser 15 is located on the upper section 9 or slightly above it.
- the lower stabiliser 14 ensures that the axis 16 of the lower section 10, which determines the rotational axis of the driven shaft 12 and the rotary drill bit 13, intersects with the main axis 8 near to the rotary drill bit 13.
- the point of intersection, in the embodiment of Fig. 2, is exactly at the centre of gravity of the stabiliser 14.
- the upper stabiliser 15 ensures that the angle of deflection of the lower section 10 is maintained relative to the main axis 8, which angle is preset by the manner in which sections 10, 11 and 9 are joined together. This joining can be effected to provide a transition 17 by short pipe bends, as shown in detail in Fig. 4, between the upper section 9 and the intermediate section 11, or by inclined, threaded connections fixed directly onto sections 9, 11, as shown in Fig. 5.
- the bore-hole 1 produced has a bent profile pointing in the direction of the axis 16. If the housing 3 is also turned, the bent rotation axis 16 also rotates, so that the resulting movement of the rotary drill bit 13 will provide a bore-hole 1 having a profile in the direction of the tool main axis 8. Selective directional drilling or straight drilling can thus be achieved in a simple manner by locking or turning the rotary table 5 and hence the drill string 4 and housing 3.
- the bore-hole widens only slightly when operating in the straight drilling mode and compared with the directional drilling operation mode because of the eccentric movement of the rotary drill bit 13.
- the amount of bore-hole widening corresponds to about twice the value of the axial displacement 27 between the rotational axis 16 and the main tool axis 8 in the area of the rotary drill bit 13; this axial displacement 27 is also referred to as offset.
- the offset 27 can be reduced to zero if an eccentric stabiliser is used instead of the centric stabiliser 14 shown in Fig. 2; the eccentricity of the eccentric stabiliser is arranged to compensate for the offset.
- Fig. 3 shows such a modified embodiment in which the stabiliser 18 adjacent to the rotary drill bit 13 is an eccentric stabiliser.
- Such an embodiment can be used to avoid widening of the bore-hole during straight drilling and also has the advantages that wear in the gauge area of the rotary drill bit 13 and on the outer surface of the stabiliser 18 can be reduced and that bending stresses can be kept away from the housing 3.
- the drilling tool 2 can be operated with drill bits 13 of various diameter. This is facilitated by providing interchangeable stabilisers.
- the eccentricity of the lower stabiliser 18 can be preset. Figs. 6 to 12 illustrate various embodiments of eccentric stabiliser.
- the stabiliser 18 shown in Figs. 6 and 7 consists in each case of a carrier body 19 and a ribbed shell 20 which is fixed on the carrier body 19 by a positive connection.
- the ribbed shell 20 can be aligned stepwise relative to the carrier body 19.
- the positive connections between parts 19 and 20 are formed by splines 21 and in the embodiment in Fig. 7 by radially distributed teeth 22.
- Figs. 8 to 10 enable the ribbed shell 20 to be interchanged and provide for continuous adjustment relative to the carrier body 19.
- the relative positions of the shell and carrier body can be fixed by a frictional connection.
- the ribbed shell 20 is fixed by an interference fit which is brought about by applying hydraulic pressure to expand the ribbed shell 20 forcing it onto the carrier body and relieving the pressure load on the ribbed shell 20.
- the shell 20 is provided with seals 23.
- Fig. 9 shows how the ribbed shell 20 can be fixed by means of a longitudinally slotted intermediate shell 24 which presents a conical threaded area to the ribbed shell 20 and, when screwed together with the shell 19 locks it to the carrier body 19.
- the ribbed shell 20 is slotted along a rib and is clamped to the carrier body 19 in the manner of a clamping collar by several screws 25.
- the stabiliser 18 is desired to have selected preset eccentricity an embodiment such as shown in Figs. 11 and 12 can be selected.
- the stabiliser comprises an eccentric intermediate shell 26.
- the amount of eccentricity of the stabiliser 18 can be changed stepwise between a maximum value and a minimum value, retaining the possibility of alignment of the ribbed shell 20 relative to the carrier body 19.
- the parts are fixed by radially distributed teeth, as described with respect to the embodiment of Fig. 7.
- the intermediate section 11 is designed as a plurality of interchangeable elements so that the angle between the axes of the upper and lower sections can be preset.
- the embodiments are modifications of the embodiment shown in Fig. 2 and similar reference numerals are used for similar components.
- the deflection tendency of the drilling tool is determined so that exactly the required minimum radius of curvature can be achieved during directional drilling.
- the deflection tendency can be obtained by presetting a corresponding deflection anglec( of the intermediate section 11. This is illustrated in Fig. 13 by two further angles represented by dotted lines 11' and 11", with 11" corresponding to a deflection of 0°, which is equivalent to the intermediate section 11° being aligned coaxially with the tool main axis 8.
- the intermediate sections are of the same length they can only differ in their angular setting ⁇ .
- This type of set of intermediate sections is advantageous for unchanged use of the shaft which rotates inside the intermediate section 11 to drive the driven shaft 12.
- the set of intermediate sections can differ in length and can be set at their upper and lower ends at a uniform angle ⁇ , ⁇ to the upper housing section 9 and the lower housing section 10 respectively. Sets combining both features can also be provided.
- the length and deflection angle ⁇ of the intermediate section 11 can be fixed and the angle ⁇ can be selected to suit the desired purpose.
- the housing section 10 is conveniently also designed as an interchangeable part in order to obtain, by interchange, various angles ⁇ or, in combination with various deflection angles ⁇ , various angles ⁇ . Also various lengths of the housing section 10 adjoining the intermediate section 11 can be employed with the connection to the intermediate section 11, for example, being made by an angularly set thread.
- a further possibility of setting the deflection tendency of the drilling tool 2 is to change the distance between the stabilisers 14 and 15 or the distance between the stabiliser 14 and the rotary drill bit 13.
- the first stabiliser 14 is arranged in such a way that it can be adjust- ably fixed in different positions on the lower housing section 10. This facility, either on its own or in combination with certain preset deflection angles and/or certain preset lengths of the intermediate section 11 or lower housing section 10, enables the deflection tendency to be controlled.
- the stabiliser 14 may also be of variable eccentricity so that the bit offset, which changes when the stabiliser 14 is displaced on the lower housing section 10 can be compensated. As the drill bit 13 is moved further away the eccentricity of the stabiliser 14 is increased; two further positions are shown by the dotted lines at 14' and 14". To make a displacement on the housing section possible, the stabiliser 14 may, for example, be designed as shown and described in Figs. 9 and 10.
- Fig. 15 illustrates the relationship between the arrangement of the stabilisers 14 and 15 and the rotary drill bit 13 and the radius of curvature of the directional drilling.
- a drilling device as shown in Figs. 13 and 14
- the intersection points S14, s 15 and S 13 of the housing axes with the centre transverse planes of the stabilisers 14, 15 and the rotary drill bit 13 respectively are shown in Fig. 4.
- the centre point of the arc of the drill hole profile achieved in this configuration is obtained by the intersection point M of the centre verticals 17;18 on the respective connecting lines 19;20 between the intersection points S 14 , S 15 of the stabilisers 14 and 15 or the intersection points S 14 , S 13 of the stabiliser 14 and the tool bit 13.
- the radius of curvature R is then obtained from the distance of the respective intersection points S 14 , S 15 and S13 to the intersection point M of the centre verticals.
- the connecting lines between the intersection points do not have to coincide with the axes of the respective housing sections in every embodiment.
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Abstract
Description
- This invention relates to apparatus for selective straight or directional drilling underground formations.
- European Patent Application No. 0085444 describes a device which is capable of being used for straight drilling or for drilling at an angle. In particular the application describes a method and means for controlling the course of a bore hole during drilling.
- The method and means includes first and second stabilisers which are arranged to support the housing for a down-hole motor having an output shaft for connecting to a drill bit. At least one of the stabilisers is eccentric relative to the housing so that rotation of the housing will cause a change in the angle of the axis of the output shaft of the down-hole motor. Thus by controlling the rotation of the housing and the length of time of operation of the down-hole motor the course of the bore-hole can be controlled.
- The change in angle causes stresses to be introduced into the housing which are transmitted to the drill bit causing excessive friction between the drill bit and the wall of the bore-hole. Furthermore additional strains are imposed on the stabilisers, the connections between the drill string and the housing, between the down-hole motor output shaft and the drill bit and between sections of the housing. These stresses can lead to damage and/or excessive wear of bearings.
- It is an object of the present invention to provide an improved device for use in underground drilling which reduces the stress-related problems identified above.
- According to the present invention we provide a device for use in underground drilling of bore-holes comprising:
- a tubular housing;
- a down-hole motor mounted in said housing and having an output shaft;
- means for connecting said output shaft to a drill bit;
- means for connecting said housing to a drill string;
- first and second stabilisers mounted on said housing;
- said housing comprising an upper section, an intermediate section and a lower section connected to one another, said first stabiliser being associated with said lower section of said housing and said second stabiliser being associated with said upper section of said housing;
- said upper section having a longitudinal axis and said lower section having a longitudinal axis which is arranged at an angle relative to the axis of said upper section; and
- said intermediate section having a longitudinal axis which intersects said upper and lower section axes.
- Preferably the upper and lower sections of the housing are connected to the intermediate section by angled connectors, especially threaded connectors.
- In one form of the invention said intermediate section includes a plurality of interchangeable elements whereby the angle between the axes of the upper and lower housing sections can be preset. Conveniently the length of the intermediate section when preset at one angle is different from the length of the intermediate section when set at a different angle.
- In this form of the invention it is preferred that the lower housing section is provided with a connecting portion which is set at an angle relative to the lower section axis which is determined by the preset angle to the intermediate section.
- The position of the first and/or second stabilisers can be adjustable relative to the lower housing section and/or upper housing section respectively.
- It is preferred that at least the first stabiliser had adjustable eccentricity. Suitable stabilisers having adjustable eccentricity are described in German Patent Application No. P34 03 239.8-24.
- Reference is now made to the accompanying drawings, in which:-
- Fig. 1 is a schematic diagram of a drilling device for use in controlled drilling of a bore-hole according to the invention;
- Figs. 2 and 3 are schematic diagrams of alternative drilling devices according to the invention;
- Figs. 4 and 5 are detailed views on an enlarged scale of parts of the device shown in Fig. 2;
- Figs. 5 to 10 illustrate diagrammatically alternative embodiments of eccentric stabilisers for use in the device of the invention;
- Fig. 11 is a side view of a stabiliser with adjustable eccentricity;
- Fig. 12 is a cross-section through the stabiliser shown in Fig. ll;
- Fig. 13 is a schematic diagram of a further device according to the-invention;
- Fig. 14 is a schematic diagram of a device according to the invention with a lower stabiliser shown in different positions; and
- Fig. 15 is a diagram showing the relationship between the radius of curvature of the drill hole profile and the relative positions of the stabiliser and drill bit.
- The device shown in Fig. 1 incorporates the concepts of European Patent Application No. 0085444 the disclosure of which is included herein by reference. The
drilling device 2 is shown in position in a bore-hole 1. It comprises ahousing 3 connected to adrill string 4 by means not shown. The connecting means may be a screw threaded arrangement as shown in European Patent Application No. 0085444. Thedrill string 4 is arranged to be rotated by aturntable 5 having a locking device 7 to prevent rotation of theturntable 5 anddrill string 4. Theturntable 5 and locking device 7 are mounted on aderrick 6. - The locking device 7 controls the rotation of the
drill string 4 to permit, for example continuous rotation or limited rotation for alignment purposes. When the locking device is in its locking condition it prevents rotation of thedrill string 4 and thehousing 3. - The alternative embodiments of the
drilling device 2, shown in Figs. 2 and 3, have, as common features, ahousing 3 which consists of anupper section 9 concentric with a toolmain axis 8, alower section 10 deflected relative to the toolmain axis 8, and anintermediate section 11 connecting thelower section 10 to theupper section 9. - A motor (not shown) may be arranged in the
section 9 of thehousing 3. The motor may be of any conventional type, for example, a turbine motor, a vane motor, a Moineau type motor or an electric motor. The motor rotor is connected tσ^arotary drill bit 13 via a universal joint and shaft leading through theintermediate section 11 and via a drivenshaft 12 mounted in thelower housing section 10. - A
stabiliser 14 is located on thelower section 10 and astabiliser 15 is located on theupper section 9 or slightly above it. Thelower stabiliser 14 ensures that theaxis 16 of thelower section 10, which determines the rotational axis of the drivenshaft 12 and therotary drill bit 13, intersects with themain axis 8 near to therotary drill bit 13. The point of intersection, in the embodiment of Fig. 2, is exactly at the centre of gravity of thestabiliser 14. - The
upper stabiliser 15 ensures that the angle of deflection of thelower section 10 is maintained relative to themain axis 8, which angle is preset by the manner in whichsections transition 17 by short pipe bends, as shown in detail in Fig. 4, between theupper section 9 and theintermediate section 11, or by inclined, threaded connections fixed directly ontosections - By deflecting the axis of the
lower housing section 10 and thus axes of thedrive shaft 12 and therotary drill bit 13 relative to themain tool axis 8, with thehousing 3 in a fixed positon, the bore-hole 1 produced has a bent profile pointing in the direction of theaxis 16. If thehousing 3 is also turned, thebent rotation axis 16 also rotates, so that the resulting movement of therotary drill bit 13 will provide a bore-hole 1 having a profile in the direction of the toolmain axis 8. Selective directional drilling or straight drilling can thus be achieved in a simple manner by locking or turning the rotary table 5 and hence thedrill string 4 andhousing 3. - By arranging the point of intersection of the
rotational axis 16 with the toolmain axis 8 to be near to therotary drill bit 13 the bore-hole widens only slightly when operating in the straight drilling mode and compared with the directional drilling operation mode because of the eccentric movement of therotary drill bit 13. - The amount of bore-hole widening corresponds to about twice the value of the
axial displacement 27 between therotational axis 16 and themain tool axis 8 in the area of therotary drill bit 13; thisaxial displacement 27 is also referred to as offset. - The
offset 27 can be reduced to zero if an eccentric stabiliser is used instead of thecentric stabiliser 14 shown in Fig. 2; the eccentricity of the eccentric stabiliser is arranged to compensate for the offset. Fig. 3 shows such a modified embodiment in which the stabiliser 18 adjacent to therotary drill bit 13 is an eccentric stabiliser. Such an embodiment can be used to avoid widening of the bore-hole during straight drilling and also has the advantages that wear in the gauge area of therotary drill bit 13 and on the outer surface of thestabiliser 18 can be reduced and that bending stresses can be kept away from thehousing 3. - The
drilling tool 2 can be operated withdrill bits 13 of various diameter. This is facilitated by providing interchangeable stabilisers. The eccentricity of thelower stabiliser 18 can be preset. Figs. 6 to 12 illustrate various embodiments of eccentric stabiliser. - The
stabiliser 18 shown in Figs. 6 and 7 consists in each case of acarrier body 19 and aribbed shell 20 which is fixed on thecarrier body 19 by a positive connection. In the alternatives shown, theribbed shell 20 can be aligned stepwise relative to thecarrier body 19. In the embodiment in Fig. 6, the positive connections betweenparts splines 21 and in the embodiment in Fig. 7 by radially distributedteeth 22. - The alternatives shown in Figs. 8 to 10 enable the
ribbed shell 20 to be interchanged and provide for continuous adjustment relative to thecarrier body 19. The relative positions of the shell and carrier body can be fixed by a frictional connection. - In Fig. 8, the
ribbed shell 20 is fixed by an interference fit which is brought about by applying hydraulic pressure to expand the ribbedshell 20 forcing it onto the carrier body and relieving the pressure load on theribbed shell 20. Theshell 20 is provided withseals 23. - Fig. 9 shows how the
ribbed shell 20 can be fixed by means of a longitudinally slottedintermediate shell 24 which presents a conical threaded area to theribbed shell 20 and, when screwed together with theshell 19 locks it to thecarrier body 19. In the alternative shown in Fig. 10 the ribbedshell 20 is slotted along a rib and is clamped to thecarrier body 19 in the manner of a clamping collar byseveral screws 25. - If the
stabiliser 18 is desired to have selected preset eccentricity an embodiment such as shown in Figs. 11 and 12 can be selected. In addition to thecarrier body 19 and theribbed shell 20, the stabiliser comprises an eccentricintermediate shell 26. By turning theribbed shell 20 relative to theintermediate shell 26, the amount of eccentricity of thestabiliser 18 can be changed stepwise between a maximum value and a minimum value, retaining the possibility of alignment of the ribbedshell 20 relative to thecarrier body 19. The parts are fixed by radially distributed teeth, as described with respect to the embodiment of Fig. 7. - In the embodiments of the
drilling tool 2 shown in Figs. 13 and 14 theintermediate section 11 is designed as a plurality of interchangeable elements so that the angle between the axes of the upper and lower sections can be preset. The embodiments are modifications of the embodiment shown in Fig. 2 and similar reference numerals are used for similar components. - When straight drilling, to minimise the disturbing effects caused by the deflected
section 10 of thedrilling tool 2, the deflection tendency of the drilling tool is determined so that exactly the required minimum radius of curvature can be achieved during directional drilling. The deflection tendency can be obtained by presetting a corresponding deflection anglec( of theintermediate section 11. This is illustrated in Fig. 13 by two further angles represented bydotted lines 11' and 11", with 11" corresponding to a deflection of 0°, which is equivalent to theintermediate section 11° being aligned coaxially with the toolmain axis 8. - In practice it is desirable to supply a set of at least two interchangeable parts in which the
intermediate sections housing section 10. - If the intermediate sections are of the same length they can only differ in their angular setting α. This type of set of intermediate sections is advantageous for unchanged use of the shaft which rotates inside the
intermediate section 11 to drive the drivenshaft 12. Alternatively the set of intermediate sections can differ in length and can be set at their upper and lower ends at a uniform angle α,β to theupper housing section 9 and thelower housing section 10 respectively. Sets combining both features can also be provided. - The length and deflection angle α of the
intermediate section 11 can be fixed and the angle β can be selected to suit the desired purpose. Thehousing section 10 is conveniently also designed as an interchangeable part in order to obtain, by interchange, various angles β or, in combination with various deflection angles α, various angles α. Also various lengths of thehousing section 10 adjoining theintermediate section 11 can be employed with the connection to theintermediate section 11, for example, being made by an angularly set thread. - A further possibility of setting the deflection tendency of the
drilling tool 2 is to change the distance between thestabilisers stabiliser 14 and therotary drill bit 13. Such an arrangement is illustrated in Fig. 14. Thefirst stabiliser 14 is arranged in such a way that it can be adjust- ably fixed in different positions on thelower housing section 10. This facility, either on its own or in combination with certain preset deflection angles and/or certain preset lengths of theintermediate section 11 orlower housing section 10, enables the deflection tendency to be controlled. - The
stabiliser 14 may also be of variable eccentricity so that the bit offset, which changes when thestabiliser 14 is displaced on thelower housing section 10 can be compensated. As thedrill bit 13 is moved further away the eccentricity of thestabiliser 14 is increased; two further positions are shown by the dotted lines at 14' and 14". To make a displacement on the housing section possible, thestabiliser 14 may, for example, be designed as shown and described in Figs. 9 and 10. - Fig. 15 illustrates the relationship between the arrangement of the
stabilisers rotary drill bit 13 and the radius of curvature of the directional drilling. Utilising a drilling device as shown in Figs. 13 and 14, the intersection points S14, s15 and S13 of the housing axes with the centre transverse planes of thestabilisers rotary drill bit 13 respectively are shown in Fig. 4. The centre point of the arc of the drill hole profile achieved in this configuration is obtained by the intersection point M of thecentre verticals 17;18 on the respective connectinglines 19;20 between the intersection points S14, S15 of thestabilisers stabiliser 14 and thetool bit 13. The radius of curvature R is then obtained from the distance of the respective intersection points S14, S15 and S13 to the intersection point M of the centre verticals. The connecting lines between the intersection points do not have to coincide with the axes of the respective housing sections in every embodiment. - Finally, values are given for a practical embodiment of the drilling tool of Fig. 14. The distance between S14 and S15 corresponding to the length of
line 19 is 8150 mm. The distance between S14 and S13 corresponding to the length ofline 20 is 1155 mm. Angle α ofsection 11 to the toolmain axis 8 is 0.60. In this configuration, the radius R of 435 m. is obtained. The distance between S14 and S13 can be increased from 1155 mm. to 1955 mm. (and the distance S14 to S15 can be reduced) so as to increase the deflection tendency and reduce the radius of curvature R (cf. R', M' and S'14 in Fig. 4).
Claims (22)
characterised in that said upper section has a longitudinal axis (8) and said lower section having a longitudinal axis (16) which is arranged at an angle relative to the axis of said upper section; and an intermediate section (11) is provided between said upper section (9) and lower section (10) having a longitudinal axis which intersects said upper and lower section axes.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19843417743 DE3417743C1 (en) | 1984-05-12 | 1984-05-12 | Apparatus for alternative straight or directional drilling in underground rock formations |
DE3417743 | 1984-05-12 | ||
DE3423465 | 1984-06-26 | ||
DE19843423465 DE3423465C1 (en) | 1984-06-26 | 1984-06-26 | Devices for alternative straight or directional drilling in underground rock formations |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0163946A1 true EP0163946A1 (en) | 1985-12-11 |
EP0163946B1 EP0163946B1 (en) | 1989-04-05 |
Family
ID=25821161
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85105353A Expired EP0163946B1 (en) | 1984-05-12 | 1985-05-02 | Apparatus for optional straight or directional drilling underground formations |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0163946B1 (en) |
CA (1) | CA1235686A (en) |
NO (1) | NO162926C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5094304A (en) * | 1990-09-24 | 1992-03-10 | Drilex Systems, Inc. | Double bend positive positioning directional drilling system |
GB2336171A (en) * | 1998-04-09 | 1999-10-13 | Dresser Ind | Downhole adjustable stabilizer |
US6328119B1 (en) | 1998-04-09 | 2001-12-11 | Halliburton Energy Services, Inc. | Adjustable gauge downhole drilling assembly |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9523244B2 (en) | 2012-11-21 | 2016-12-20 | Scientific Drilling International, Inc. | Drill bit for a drilling apparatus |
Citations (9)
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US3380543A (en) * | 1966-01-19 | 1968-04-30 | Pan American Petroleum Corp | Directional well-drilling apparatus |
FR1593999A (en) * | 1968-12-04 | 1970-06-01 | ||
FR2220664A1 (en) * | 1973-03-08 | 1974-10-04 | Christensen Diamond Prod Co | |
FR2269630A1 (en) * | 1974-05-01 | 1975-11-28 | Christensen Diamond Prod Co | |
US3993127A (en) * | 1974-08-08 | 1976-11-23 | Viktor Gavrilovich Chepelev | Apparatus for positioning a working implement in a borehole |
US4059164A (en) * | 1976-05-19 | 1977-11-22 | Farris Ralph J | Self-stabilizing drilling tool |
US4108256A (en) * | 1977-05-12 | 1978-08-22 | Continental Oil Company | Sliding stabilizer assembly |
US4185704A (en) * | 1978-05-03 | 1980-01-29 | Maurer Engineering Inc. | Directional drilling apparatus |
BE886147A (en) * | 1980-11-13 | 1981-03-02 | American Coldset Corp | DRILLING STABILIZER. |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB636879A (en) * | 1946-07-12 | 1950-05-10 | Rolen Arcenjevitch Joannesjan | Improvements in or relating to the drilling of deep wells |
US3260318A (en) * | 1963-11-12 | 1966-07-12 | Smith Ind International Inc | Well drilling apparatus |
-
1985
- 1985-05-02 EP EP85105353A patent/EP0163946B1/en not_active Expired
- 1985-05-03 CA CA000480696A patent/CA1235686A/en not_active Expired
- 1985-05-10 NO NO851885A patent/NO162926C/en unknown
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3380543A (en) * | 1966-01-19 | 1968-04-30 | Pan American Petroleum Corp | Directional well-drilling apparatus |
FR1593999A (en) * | 1968-12-04 | 1970-06-01 | ||
FR2220664A1 (en) * | 1973-03-08 | 1974-10-04 | Christensen Diamond Prod Co | |
FR2269630A1 (en) * | 1974-05-01 | 1975-11-28 | Christensen Diamond Prod Co | |
US3993127A (en) * | 1974-08-08 | 1976-11-23 | Viktor Gavrilovich Chepelev | Apparatus for positioning a working implement in a borehole |
US4059164A (en) * | 1976-05-19 | 1977-11-22 | Farris Ralph J | Self-stabilizing drilling tool |
US4108256A (en) * | 1977-05-12 | 1978-08-22 | Continental Oil Company | Sliding stabilizer assembly |
US4185704A (en) * | 1978-05-03 | 1980-01-29 | Maurer Engineering Inc. | Directional drilling apparatus |
BE886147A (en) * | 1980-11-13 | 1981-03-02 | American Coldset Corp | DRILLING STABILIZER. |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5094304A (en) * | 1990-09-24 | 1992-03-10 | Drilex Systems, Inc. | Double bend positive positioning directional drilling system |
GB2336171A (en) * | 1998-04-09 | 1999-10-13 | Dresser Ind | Downhole adjustable stabilizer |
US6158533A (en) * | 1998-04-09 | 2000-12-12 | Halliburton Energy Services, Inc. | Adjustable gauge downhole drilling assembly |
US6328119B1 (en) | 1998-04-09 | 2001-12-11 | Halliburton Energy Services, Inc. | Adjustable gauge downhole drilling assembly |
GB2336171B (en) * | 1998-04-09 | 2002-04-24 | Dresser Ind | Adjustable gauge downhole drilling assembly |
Also Published As
Publication number | Publication date |
---|---|
NO162926B (en) | 1989-11-27 |
NO851885L (en) | 1985-11-13 |
CA1235686A (en) | 1988-04-26 |
EP0163946B1 (en) | 1989-04-05 |
NO162926C (en) | 1990-03-07 |
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