EP0178709B1 - Stabilisator - Google Patents

Stabilisator Download PDF

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Publication number
EP0178709B1
EP0178709B1 EP85201531A EP85201531A EP0178709B1 EP 0178709 B1 EP0178709 B1 EP 0178709B1 EP 85201531 A EP85201531 A EP 85201531A EP 85201531 A EP85201531 A EP 85201531A EP 0178709 B1 EP0178709 B1 EP 0178709B1
Authority
EP
European Patent Office
Prior art keywords
drilling
rot
passageways
stabilizing device
ribs
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.)
Expired
Application number
EP85201531A
Other languages
English (en)
French (fr)
Other versions
EP0178709A1 (de
Inventor
Honoré Joseph Lambot
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.)
Diamant Boart NV SA
Original Assignee
Diamant Boart NV 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
Priority claimed from BE0/213816A external-priority patent/BE900804A/fr
Application filed by Diamant Boart NV SA filed Critical Diamant Boart NV SA
Priority to AT85201531T priority Critical patent/ATE39011T1/de
Publication of EP0178709A1 publication Critical patent/EP0178709A1/de
Application granted granted Critical
Publication of EP0178709B1 publication Critical patent/EP0178709B1/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
    • 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
    • E21B17/1092—Gauge section of drill bits
    • 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
    • E21B17/22—Rods or pipes with helical structure

Definitions

  • the present invention relates to a device for stabilizing a drill string, consisting of a steel cylinder having laterally helical projections provided with a coating offering good resistance to erosion and abrasion.
  • the stabilization devices are mainly intended to control the direction and quality of drilling in deep vertical or directional wells.
  • a stabilizing sleeve usually used for directional turbine or rotary drilling consists of a cylindrical steel casing fixed to the end of a drill string, in the vicinity of a diamond-tipped bit or a crown, in alignment with the latter, by means of a cylindrical end piece of determined length, provided with a standardized fixing thread.
  • Helical projections provided on the outer side wall of the aforementioned envelope determine a cylinder of diameter substantially equal to the diameter of the drilled hole.
  • the diameter of the envelope is generally a few tens of millimeters less than the diameter of the cylinder determined by the helical projections.
  • the helical projections are covered with a coating, having excellent resistance to erosion and abrasion.
  • the recesses formed between the projections allow the rock waste entrained by the drilling fluid to rise.
  • the stabilizing sleeve allows the forces of the diamond drilling tool to be distributed along a larger contact surface on the side wall of the drilled well, thus reducing the capacity of lateral destruction of the rock by the tool under the 'effect of its own weight and limiting the pendulum effect of the entire drilling rig as well as spiraling in drilling with a turbine.
  • Spiraling is a deformation of the corkscrew hole. It has the effect of increasing the risk of the drill string getting stuck in the hole.
  • the deviation intensity is defined as the increase in the deviation from an initial direction of drilling per unit of length drilled.
  • the stabilizer has large water passages arranged helically along the sleeve, in a symmetrical configuration which does not contribute to generating or increasing any tendency to deflect the cutting tool from a straight path.
  • the BURGE patent makes it possible to prevent but does not make it possible to correct a deviation from the trajectory.
  • the present invention provides the means to modify at will to the left or to the right, the deviations generated by a rapid rotation of the drill string in a directional deep drilling. It of course makes it possible to reduce the amplitude of the unwanted deviations.
  • the invention therefore relates to a method, according to which stabilizer sleeves are advantageously used which have modifications on the wings which provide them with a sufficient contact surface only to limit the lateral aggressiveness of the drilling tool and at the same time to control, that is to say modify at will, the angle of azimuthal deviation towards the left of the lining in drilling with the turbine.
  • It relates to a device for stabilizing a drill string, consisting of a cylindrical steel body having laterally helical projections separated by passages of drilling fluid provided with a coating offering good resistance to erosion and abrasion, essentially characterized in that it comprises at least one substantially circumferential groove formed in the aforesaid projections, so as to connect the recesses therebetween between them; according to a feature of the invention, the aforementioned grooves are formed over part of the height of the projections.
  • the grooves are advantageously provided, preferably by milling, at regular intervals along the helical projections.
  • a single groove has a helical shape with a short pitch.
  • a different embodiment includes at least two portions of sleeves of the same diameter arranged in the same alignment behind the drilling tool.
  • a drilling tool designated as a whole by the reference notation 1 usually used for deep directional drilling with a turbine or rotary, consists of a drilling head 2 proper, produced either made of composite material shaped by powder metallurgy techniques, either steel or cast metal.
  • the head 2 is a drill bit or a drilling crown provided over its entire surface in contact with the bottom of the well, with cutting elements 3 placed so as to make effective both the destruction of the rock and the evacuation of shavings.
  • This drilling head 2 is fixed to the end of a drill string, not shown, by means of a frustoconical end piece 4 of variable length between 15 and 100 cm and having a fixing thread 5 meeting the standards in force.
  • a stabilization device consisting of a cylindrical body 6 of steel, having laterally helical projections 7 provided with a coating 8 having sufficient resistance to erosion and abrasion and generally designated by the reference notation 9, is mounted in alignment with the drilling head 2, behind the latter, on the cylindrical end piece 4.
  • the coating 8 of the helical projections 7 may be made of a hard metal or a composite material, possibly diamond-coated.
  • an oil film 13 is constantly established between the two surfaces in relative movement, namely the shaft 11 and the bearing 12.
  • the oil film under pressure is generated by the very movement of the 'shaft 11 provided that the speed of rotation is sufficient.
  • the choice of operating mode namely hydrodynamic lubrication or direct contact depends on the speed of rotation of the bearing, the dynamic viscosity of the lubricating fluid, the length of the bearing, the diameter of the bearing, the load applied to the rotor and relative radial clearance, with respect to the radius, relative radial clearance between 0.8 - 1 (J3 and 4 - 10 -3 .
  • the setting angle is one of the parameters that characterize the average position of the rotor in the stator. It is indicated by the reference notation ⁇ in FIG. 4.
  • Sommerfeld's theory also demonstrates that the setting angle, the resisting torque, the dissipated power and the axial flow of lubricant depend only for a given length / diameter ratio, relative eccentricity s, equal to e / c, that is to say the ratio of absolute eccentricity, expressed in millimeters, on absolute radial clearance also expressed in millimeters.
  • Figure 6 shows, in fact, the relationship observed for a turbine drill tilted at about 45 ° C between the intensity of deviation to the left and the length of the stabilization device. We can assimilate this relation to a function of the first degree, when all the other parameters remain identical.
  • FIG. 7 shows how the static load Pst corresponding to an equivalent hydrodynamic behavior varies, as a function of the length of the stabilization device.
  • the invention consists in providing a known stabilizing device with an improvement with a view to controlling accidental deviations without, however, modifying the total length of the above-mentioned device 9, essential to avoid spiraling.
  • This improvement consists in providing, perpendicular to the longitudinal axis of the stabilizing device 9, at least one groove 15, substantially circumferential formed in the projections 8 above, so as to interconnect, the recesses 14 included therebetween.
  • the grooves 15 can be formed in the above projections, by milling, over a portion of their height. These grooves 15 have the effect of bringing into communication an area in which the lubricant is subjected to a high pressure, with an area in which the lubricant is at a lower pressure. Such a groove 15 reduces the bearing capacity of the bearing and therefore the deviation to the left due to the hydrodynamic operation.
  • Figure 3 shows a second possible embodiment in which the groove 15, of helical shape is formed in a direction different from that of the helical projections 8 above. A doubly spiraled sleeve is thus obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Sliding-Contact Bearings (AREA)
  • Drilling Tools (AREA)

Claims (7)

1. Verfahren zum Verändern der Bewegungsbahn eines Schneidwerkzeuges zum Tiefenbohren, das entweder durch einen aufgehängten Motor bzw. eine aufgehängte Turbine mit einer Geschwindigkeit von mindestens 700 upm oder durch einen Drehtisch von der Oberfläche aus mit einer Geschwindigkeit von mindestens 100 upm angetrieben ist, mit Hilfe einer Stabilisierungsvorrichtung mit seitlichen schraubenförmigen Vorsprüngen (8), welche durch Bohrflüssigkeitsdurchlässe (14) getrennt und mit einer Beschichtung versehen sind, die gute Widerstandsfähigkeit gegen Erosion und Abrieb bietet, dadurch gekennzeichnet, daß man in den Vorsprüngen mindestens eine Nut (15) anbringt, die im wesentlichen in Umfangsrichtung in einer zur Rotationsachse rechtwinkligen Ebene derart angeordnet ist, daß sie die Bohrflüssigkeitsdurchlässe (14) miteinander verbindet.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man die Tiefe der Nut (15) variiert.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß man die Anzahl und die Anordnung der Nuten (15) variiert.
4. Stabilisierungsvorrichtung für einen Stangenzug, der mit einem Schneidwerkzeug zum Tiefenbohren versehen ist, welches entweder durch einen aufgehängten Motor bzw. eine aufgehängte Turbine mit einer Geschwindigkeit von mindestens 700 upm oder durch einen Drehtisch von der Oberfläche aus mit einer Geschwindigkeit von mindestens 100 upm angetrieben ist, bestehend aus einer zylindrischen Hülle aus Stahl mit seitlichen schraubenförmigen Vorsprüngen (8), welche durch Bohrflüssigkeitsdurchlässe (14) getrennt und mit einer Beschichtung versehen sind, die gute Widerstandsfähigkeit gegen Erosion und Abrieb bietet, dadurch gekennzeichnet, daß die Vorsprünge (8) mindestens eine Nut (15) aufweisen, die im wesentlichen in Umfangsrichtung in einer zur Rotationsachse rechtwinkligen Ebene derart angeordnet ist, daß sie die Bohrflüssigkeitsdurchlässe (14) miteinander verbindet.
5. Stabilisierungsvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Nuten (15) in einem Höhenabschnitt der Vorsprünge (8) angebracht sind.
6. Stabilisierungsvorrichtung nach einem der Ansprüche 4 und 5, dadurch gekennzeichnet, daß die Umfangsnuten (15) mit ggf. regelmäßigen Intervallen längs der schraubenförmigen Vorsprünge (8) angebracht sind.
7. Stabilisierungsvorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß sie aus mindestens zwei Hülsenabschnitten mit gleichem Durchmesser besteht, die in gleicher Ausrichtung hinter dem Bohrwerkzeug (1) angeordnet sind.
EP85201531A 1984-10-11 1985-09-24 Stabilisator Expired EP0178709B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85201531T ATE39011T1 (de) 1984-10-11 1985-09-24 Stabilisator.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE0/213816A BE900804A (fr) 1984-10-11 1984-10-11 Dispositif de stabilisation.
BE213816 1984-10-11

Publications (2)

Publication Number Publication Date
EP0178709A1 EP0178709A1 (de) 1986-04-23
EP0178709B1 true EP0178709B1 (de) 1988-11-30

Family

ID=3843801

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85201531A Expired EP0178709B1 (de) 1984-10-11 1985-09-24 Stabilisator

Country Status (5)

Country Link
EP (1) EP0178709B1 (de)
AT (1) ATE39011T1 (de)
DE (1) DE3566566D1 (de)
DK (1) DK162459C (de)
NO (1) NO854028L (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104179464A (zh) * 2014-08-08 2014-12-03 陆威延 地质资源勘探钻井钻具扶正居中及套管防磨井下工具

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3822249A1 (de) * 1988-07-01 1990-01-04 Hilti Ag Hohlbohrwerkzeug
GB9202163D0 (en) * 1992-01-31 1992-03-18 Neyrfor Weir Ltd Stabilisation devices for drill motors
FR2789438B1 (fr) 1999-02-05 2001-05-04 Smf Internat Element profile pour un equipement de forage rotatif et tige de forage comportant au moins un troncon profile
EP2118429B1 (de) * 2007-02-02 2016-04-13 Halliburton Energy Services, Inc. Lenksystem und -verfahren für einen drehbohrer
CA2687544C (en) * 2007-05-30 2016-11-08 Halliburton Energy Services, Inc. Rotary drill bit with gage pads having improved steerability and reduced wear
GB201519636D0 (en) 2015-11-06 2015-12-23 Smart Stabilizer Systems Ltd Stabilizer for a steerable drilling system
CN108442889A (zh) * 2017-12-19 2018-08-24 中国石油天然气股份有限公司 旋转耐磨减阻器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1343902A (en) * 1918-06-10 1920-06-22 American Well Works Weli-sinking apparatus
GB879156A (en) * 1958-09-05 1961-10-04 Hughes Tool Co Tool joint for drill pipe sections
US3554307A (en) * 1969-07-03 1971-01-12 W E Eeds Turbulent flow drill collar
CA948181A (en) * 1971-02-12 1974-05-28 Lionel Lavallee Diamond drills
CH643031A5 (de) * 1979-04-02 1984-05-15 Inst Gornogo Dela Sibirskogo O Bohrwerkzeug fuer eine gesteinsbohrmaschine.
US4245709A (en) * 1979-04-27 1981-01-20 Christensen, Inc. Removable drill string stabilizers
US4467879A (en) * 1982-03-29 1984-08-28 Richard D. Hawn, Jr. Well bore tools

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104179464A (zh) * 2014-08-08 2014-12-03 陆威延 地质资源勘探钻井钻具扶正居中及套管防磨井下工具

Also Published As

Publication number Publication date
DK162459C (da) 1992-04-21
ATE39011T1 (de) 1988-12-15
DK464085A (da) 1986-04-12
NO854028L (no) 1986-04-14
DE3566566D1 (en) 1989-01-05
EP0178709A1 (de) 1986-04-23
DK162459B (da) 1991-10-28
DK464085D0 (da) 1985-10-10

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