WO2019207347A1 - Trépan pour puits de pétrole - Google Patents

Trépan pour puits de pétrole Download PDF

Info

Publication number
WO2019207347A1
WO2019207347A1 PCT/IB2018/052942 IB2018052942W WO2019207347A1 WO 2019207347 A1 WO2019207347 A1 WO 2019207347A1 IB 2018052942 W IB2018052942 W IB 2018052942W WO 2019207347 A1 WO2019207347 A1 WO 2019207347A1
Authority
WO
WIPO (PCT)
Prior art keywords
drill bit
wall
casing
slanted
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2018/052942
Other languages
English (en)
Inventor
Sultan AL-MANSOURI
Adel AL-MARZOUQI
Farhaad AL-AWADHI
Fadi FAHMY
Ameen AL-KASASBEH
Ahmed KHAMIS
Omar AL-FARISI
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.)
Abu Dhabi National Oil Co
Original Assignee
Abu Dhabi National Oil Co
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 Abu Dhabi National Oil Co filed Critical Abu Dhabi National Oil Co
Priority to PCT/IB2018/052942 priority Critical patent/WO2019207347A1/fr
Publication of WO2019207347A1 publication Critical patent/WO2019207347A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • E21B10/00—Drill bits
    • E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
    • E21B10/627—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable with plural detachable cutting elements
    • E21B10/633—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable with plural detachable cutting elements independently detachable

Definitions

  • the present invention relates to a drill bit for oil and gas exploration.
  • a drill bit for oil and gas exploration.
  • Such a drill bit is screwed to the lower end of a drill string for performing the actual drilling work in the rock.
  • Drill bits for oil and gas exploration work by scraping or crushing rock, or both, usually as part of a rotational motion. Some bits, known as hammer bits, pound the rock vertically in much the same fashion as a construction site air hammer. Drill bits need to be replaced from time to time as they wear.
  • a common version of an oil well drill bit is a roller-cone drill bit.
  • a roller-cone bit has conical cutters or cones that have spiked teeth around them. As the drill string is rotated, the bit cones roll along the bottom of the hole in a circle. As they roll, new teeth come in contact with the bottom of the hole, crushing the rock immediately below and around the bit tooth.
  • the document US 2010/0089660 Ai shows a drill bit with axially tapered waterways that is used to drill geological and/or manmade formations.
  • the document US 2010/0089660 Ai shows a drill bit with axially tapered waterways that is used to drill geological and/or manmade formations.
  • 8,684,111 B2 shows a core drill bit used particularly to provide core samples for geological assessment of mineral content or for testing structural integrity in construction industry.
  • an oil well drill bit comprising a cylindrical body with a front section facing a drilling direction and a rear section for connection of the drill bit with a drill string, a circular hole at the center of the cylindrical body extending from the front section to the rear section, wherein the rear section comprises threads for the connection with the drill string, and the front section comprises a tapered circular ring shape.
  • this drill bit enables a better, easier and more efficient access to most of the annuals shapes used in oil well drilling.
  • the drill bit is suited for drilling between two casings and thereby prevents damage to an optionally eccentrical located inner (second) casing, because the tapered shaped at the front section of the drill bit provides for an automatic centering of the drill bit within the outer casing and around the inner casing. This prevents a contact of rock cutters of the drill bit with the preferably metal casing, which would lead to a damaging of the cutters.
  • the tapered circular ring shape comprises an outer circumferential wall slanted towards a rotation axis of the cylindrical body and an inner circumferential wall slanted towards the outside.
  • the slanted outer wall is useful in cutting operations to facilitate a sideway drilling in order to follow the downward course of an optionally eccentric second inner casing.
  • the inner surface of the drill bit ‘collects’ and guides the optionally eccentric second casing towards the center of the drill bit where it enters the inner circular hole of the drill bit.
  • the orientation of the drill bit is automatically adjusted to the downward course of the second inner casing.
  • an inclination angle of the slanted outer wall is smaller than an inclination angle of the slanted inner wall with respect to the rotation axis.
  • the drill bit provides a greater tolerance at its inner wall such that a better centering of the drill bit with the second casing is provided, even if this would be eccentric to the first casing.
  • the smaller inclination angle at the outer wall provides for or leads to a broad planar ring-shaped face at the front of the drill bit.
  • a broad planar face at the front of the drill bit allows for larger cutting means arranged on this face which in turn facilitate drilling operations.
  • a length of the slanted outer wall is greater than a length of the slanted inner wall in a rotational axis direction.
  • a larger number of cutting means can be arranged on the outer wall which facilitates the drilling operations.
  • a length of the circular hole is larger than a length of the slanted inner wall in the rotational axis direction.
  • a larger inner wall allows for a greater length of the inner hole of the drill bit that in turn leads to a better and more secure guidance of the drill bit around the second casing.
  • a ratio between an outer diameter of the drill bit and a diameter of the circular hole is larger than l.i, preferably larger than 1.3.
  • the drill bit comprises a robust cutting area in order to drill into solid rock sediment and formation, respectively.
  • a ring-shaped drill bit with a significant ring width allows for differently shaped surfaces of the drill bit for facilitating drilling operations.
  • the front section comprises a planar ring-shaped face at the foremost front of the drill bit.
  • the planar front face enables the arrangement of cutting means for the drill operation.
  • the number and/ or type and shape, respectively, of the cutting means can be adapted to actual needs with regard to the drilling operation and the type of formation, respectively.
  • the planar face allows for a straight vertical drilling.
  • each of the slanted outer and inner wall and the planar ring-shaped face comprise cutting means.
  • the cutting means provide for a cutting into formation, wherein the drill bit comprises a higher endurance due to the plurality of cutters and the big open area in-between.
  • the cutting means include a number of punctual cutters protruding from said walls and face, respectively.
  • Protruding cutters can be added and/ or replaced in case of wear to the drill bit easily.
  • the punctual cutters may comprise diamonds for a high cutting power.
  • the cutters on the slanted outer wall are arranged in groups and each group is formed along a convex line arranged in rotational axis direction.
  • the arrangement of the cutters in rotational direction facilitates the drilling operation as it guides cut rock particles to one side of the drill bit. Further, such arrangement of cutters provides for a good centering of the drill bit within the already generated drill hole.
  • the slanted inner wall includes an outer and an inner circumferential section, the outer section in direction to the front section and the inner section in direction to the rear section of the drill bit, wherein the punctual cutters are only arranged circumferentially spaced apart on the outer section.
  • the arrangement of cutters on the inner wall enables a cutting also in this area and, thus, facilitates drilling operations.
  • the cutters are, however, not arranged at the inner section of the inner wall in order to avoid any contact between the drill bit and the second inner casing which would lead to damages at the second casing and the cutters.
  • the threads at the rear end of the drill bit are male or female threads.
  • the drill bit can be easily connected to a drill string that guides and rotates the drill bit.
  • the threads can be adapted to the actual used drill strings to which they are connected and can advantageously comprise box (female) or pin (male) threads.
  • the above-mentioned problem is also solved by a method of oil and/or gas drilling between two casings, with a first casing and a second casing, wherein an inner diameter of the first casing is larger than an outer diameter of the second casing such that the second casing extends down beyond the first casing and a spacing is formed between the inner wall of the first casing and the outer wall of the second casing, the method comprising the step of: drilling into said spacing with an oil well drill bit as described above.
  • Fig. l a schematic illustration of an embodiment of the drill bit
  • Fig. 2 a cross-sectional view of the drill bit of Fig. l
  • Fig. l a schematic illustration of an embodiment of the drill bit
  • Fig. 3 a schematic illustration of an embodiment of a drilling site using the drill bit of Figs l and 2.
  • Figs l and 2 show an embodiment of a drill bit l.
  • the drill bit l comprises a cylindrical shape 10 with an outer diameter Di that fits into a first casing 50 of an oil well.
  • the drill bit 1 comprises an inner circular hole 12 with a diameter D4 to receive a second casing 60 in the circular hole 12.
  • a ratio between the outer diameter Di and the inner diameter D4 is given by D1/D4 and is larger than 1.1, preferably larger than 1.3.
  • the drill bit 1 comprises a ring shape with a significant ring width that is suitable for the aspired drilling between two casings and comprises a robust structure for drilling into solid rock formations, like e.g. granite and the like.
  • the surfaces at the front section 20 of the drill bit 1 comprise a plurality of punctual cutters 28.
  • the drill bit 1 comprises a high endurance due to its 12 bladed preferably 13 mm cutters 28 and the big open area between the cutters 28.
  • the cutters 28 protrude from the surfaces 22, 24, 26 of the drill bit 1 and are easy to replace in case of wearing.
  • the cutters 28 are made from a durable material like hard metal and may contain diamonds in order to be able to cut into solid rock formation. Thereby, the cutters 28 comprise an edged surface to facilitate working on the formation.
  • the number of cutters 28 on the planar face 26 at the front section 20 is 12, with the same number of cutters 28 on the outer section 24a of the slanted inner wall 24.
  • the inner section 24b of the slanted inner wall 24 is free of cutters 28 in order to avoid any contact between a cutter 28 and an optionally eccentric second casing 60.
  • on the slanted outer wall 22 there are 12 groups 29 of cutters 28 each group 29 comprising three cutters 28.
  • the three cutters 28 in each group 29 are aligned along a convex line L in rotation direction of the drill bit 1 in order to achieve a staggered working on the formation and facilitate the drilling operation.
  • the slanted outer wall 22 comprises a smaller inclination angle a and greater length Li than the slanted inner wall 24.
  • the slanted outer wall 22 provides for a larger drilling area with a larger number of cutters 28 than the slanted inner wall 24.
  • the slanted inner wall 24, on the other hand, provides for a larger tolerance between a cutter 28 and the second casing 60 due to the more inclined surface angle b.
  • the inclination angle a is about io° to 20°, preferably about 12 0 to 18° and preferably about 15°.
  • the surface angle b is about 30° to 50°, preferably about 35° to 45° and preferably about 40°.
  • the length L2 of the slanted inner wall 24 is shorter than the length Li, the length L3 of the adjacent circular hole 12 is longer at a given overall length of the drill bit 1. As a result, a longer circular hole 12 facilitates the adjustment of the orientation of the drill bit 1 with respect to the orientation of the optionally eccentric second casing 60.
  • the drill bit 1 In order to connect the drill bit 1 to a drill string 40, the drill bit 1 comprises threads 32, 32’ at its rear section 30. These threads 32, 32’ can be formed as outer threads 32 (pin connection) on the outer circumference of the drill bit 1 or can be formed as inner threads 32’ (box connection) along the inner circumference inside the circular hole 12.
  • a drill bit 1 may comprise both types of threads 32, 32’ at the same time in order to be connectable to different types of drill strings 40.
  • the drill bit 1 is connected to a drill string 40, see Fig. 3.
  • the drill string 40 will guide and rotate the drill bit 1.
  • the rear section 30 of the lowered drill bit 1 will face upwards to the earth’s surface S and allows for a connection to the drill string 40.
  • the connection between the drill bit 1 and the drill string 40 is a threaded connection by means of male and female threads 32, respectively, so called pin or box connections, at the rear section 30 of the drill bit 1.
  • the front end 20 of the drill bit 1 faces downward in vertical direction Z. During the drilling operation the front section 20 is in direct contact with the sediment and formation below, respectively.
  • the drill bit 1 fits at the lower end of the first casing 50 with its ring shape between the inner wall of the first casing 50 and the outer wall of the second casing 60 into a ring-shaped spacing DS.
  • the drill bit 1 cuts into the formation between both casings 50, 60, i.e. into the spacing DS.
  • any common drill bit without a tapered shape at its front end would cut into this eccentric casing while following a straight vertical downward Z course.
  • the tapered shape of the drill bit 1 allows for a spacing between the cutters 28 and the second casing 60 even if the second casing 60 is eccentric to the vertical direction Z. Due to the reception of the second casing 60 inside the inner hole 12 of the drill bit 1, the drill bit 1 will - in a further downward movement - automatically adjust its orientation in order to properly receive the second casing 60. Thereby, the drilling course of the drill bit 1 is instantly adjusted such that any unwanted contact between the cutters 28 of the drill bit 1 and the second casing 60 is avoided.
  • the drill bit 1 is designed to drill behind a 13 3/8” (340 mm) second casing 60 such that the drill bit’s 1 inner diameter D4 is about 18” (457 mm) and its outer diameter Di is about” (609 mm). Furthermore, an outer diameter D2 of the planar face 26 is about 23” (584 mm) and an inner diameter D3 is about 21” (533 mm). A distance between each convex line L of a group 29 of cutters 28 is about 1.9” (48 mm). Moreover, a distance between each cutter 28 on the planar face 26 is about 1.833” (47 mm).
  • the length Li in this first embodiment is about 141 mm, the length L2 is about 70 mm and the length L3 is about 211 mm.
  • the drill bit 1 is designed to drill behind a 30” (76.2 cm) second casing 60 such that the drill bit’s 1 inner diameter D4 is 32” (81.28 cm) and its outer diameter Di is 36” (91.44 cm).
  • the length Li in this first embodiment is about 211 mm, the length L2 is about 106 mm and the length L3 is about 317 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

La présente invention concerne un trépan (1) de puits de pétrole, comprenant un corps cylindrique (10) ayant une section avant (20) faisant face à une direction de forage Z et une section arrière (30) permettant la liaison du trépan (1) avec un train de tiges (40), un trou circulaire (12) au centre du corps cylindrique (10) s'étendant de la section (20) avant à la section arrière (30), la section arrière (30) comprenant des filetages (32) permettant la liaison avec le train de tiges (40), et la section avant (20) comprenant une forme d'anneau circulaire conique. En outre, la présente invention concerne un procédé de forage de pétrole et/ou de gaz entre deux tubages et l'utilisation d'un trépan (1).
PCT/IB2018/052942 2018-04-27 2018-04-27 Trépan pour puits de pétrole Ceased WO2019207347A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2018/052942 WO2019207347A1 (fr) 2018-04-27 2018-04-27 Trépan pour puits de pétrole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2018/052942 WO2019207347A1 (fr) 2018-04-27 2018-04-27 Trépan pour puits de pétrole

Publications (1)

Publication Number Publication Date
WO2019207347A1 true WO2019207347A1 (fr) 2019-10-31

Family

ID=68294938

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2018/052942 Ceased WO2019207347A1 (fr) 2018-04-27 2018-04-27 Trépan pour puits de pétrole

Country Status (1)

Country Link
WO (1) WO2019207347A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2326908A (en) * 1942-05-29 1943-08-17 Jr Edward B Williams Drill bit
SU1020564A1 (ru) * 1982-02-04 1983-05-30 Московский Ордена Трудового Красного Знамени Геологоразведочный Институт Им.С.Орджоникидзе Колонковое долото дл ударного бурени
WO2006076795A1 (fr) * 2005-01-18 2006-07-27 Groupe Fordia Inc Meche pour percer un trou
CN203081305U (zh) * 2012-12-24 2013-07-24 北京咏归科技有限公司 挤砂石土锥形套筒金刚石钻头

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2326908A (en) * 1942-05-29 1943-08-17 Jr Edward B Williams Drill bit
SU1020564A1 (ru) * 1982-02-04 1983-05-30 Московский Ордена Трудового Красного Знамени Геологоразведочный Институт Им.С.Орджоникидзе Колонковое долото дл ударного бурени
WO2006076795A1 (fr) * 2005-01-18 2006-07-27 Groupe Fordia Inc Meche pour percer un trou
CN203081305U (zh) * 2012-12-24 2013-07-24 北京咏归科技有限公司 挤砂石土锥形套筒金刚石钻头

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