EP2975212A1 - Bohrlochwerkzeug und Verfahren zum Montieren und Demontieren davon - Google Patents

Bohrlochwerkzeug und Verfahren zum Montieren und Demontieren davon Download PDF

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Publication number
EP2975212A1
EP2975212A1 EP14177368.9A EP14177368A EP2975212A1 EP 2975212 A1 EP2975212 A1 EP 2975212A1 EP 14177368 A EP14177368 A EP 14177368A EP 2975212 A1 EP2975212 A1 EP 2975212A1
Authority
EP
European Patent Office
Prior art keywords
cartridge
pocket
hole
section
tool assembly
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.)
Withdrawn
Application number
EP14177368.9A
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English (en)
French (fr)
Inventor
Ahmed Galal Abel-Kader
Omar Mortagy
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.)
Tercel IP Ltd
Original Assignee
Tercel IP Ltd
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 Tercel IP Ltd filed Critical Tercel IP Ltd
Priority to EP14177368.9A priority Critical patent/EP2975212A1/de
Priority to PCT/IB2015/055030 priority patent/WO2016009299A2/en
Publication of EP2975212A1 publication Critical patent/EP2975212A1/de
Withdrawn legal-status Critical Current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
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/28—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with non-expansible roller cutters
    • E21B10/30—Longitudinal axis roller reamers, e.g. reamer stabilisers
    • 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

Definitions

  • the present invention is related to a down-hole tool assembly, comprising a tool body comprising at least one pocket for insertion of a cartridge, and at least one cartridge, said cartridge being fastened in the pocket in at least two different locations by respective fastening elements which are screwed into the tool body. More particularly, the present invention also relates to a down-hole tool assembly used for reaming or stabilizing purposes.
  • This invention also relates to a method for assembling and a method for disassembling such a down-hole tool assembly.
  • a drill bit is attached to a drill string which is rotated from the surface for drilling the wellbore.
  • the path of the wellbore may be deviated intentionally or unintentionally.
  • An efficient control on the tool direction and on the quality of the borehole is essential while drilling a wellbore.
  • the drill string is provided by a plurality of stabilizer tools having substantially the same gauge as the drill bit, for centralizing the drill string in the wellbore.
  • a stabilizer tool comprises a tool body provided with upper connection means and lower connections means for connecting with the connections of the pipes of the drill string.
  • the stabilizer further comprises a plurality of blades providing contacting surfaces with the wellbore, the contacting surfaces being large enough to prevent or minimize penetration in the walls of the wellbore.
  • the blades rise from the surface of the tool body and are distributed at the periphery of the tool body such that deep and large channels are provided for flow circulation and cuttings evacuation.
  • a good stabilizer should reduce both friction and drag while drilling the wellbore.
  • Many stabilizers are known in the art and some stabilizer may be made of ultra hard matrix of tungsten carbide as disclosed in US patent n° 7878273 of the applicant.
  • the upper section of the stabilizer may be provided by a back-reaming section so as to allow the stabilizer to be used as a reamer when pulling the stabilizer out of the borehole.
  • a stabilizer tool comprising a stabilizer blade.
  • the stabilizer blade comprises a stabilizing part and a mounting part.
  • the mounting part projects downwards from the stabilizing part and has two opposed ends engaging wall forming with the horizontal an angle of about 75 degrees.
  • the mounting part is inserted into a slot with mounting blocks on both sides of the mounting part.
  • the mounting blocks are provided with sloping engaging walls which mate with the engaging walls of the mounting part.
  • Document US6776247 discloses another stabilizer tool wherein a stabilizer pad is inserted into a pocket by interference fit.
  • the stabilizer pad comprises a lateral slot containing a washer and an abutment surface opposed to the washer, both washer and abutment surface being at the center of the stabilizer pad and between which a head bolt is positioned and screwed on the tool body.
  • the underside of the head bolt bears against the washer which allows the bolt to retain the pad in the pocket, and the axially outer surface of the head bolt bears against the abutment surface provided by an opening for allowing access to a key both for tightening the pad and for releasing the pad.
  • reamers tools or roller reamers tools are inserted at a plurality of location of the drill string.
  • Reamer tools comprise a reamer body provided with upper and lower connection means for connection with the pipes of the drill string and with reaming blades bearing reaming inserts for reaming the borehole such that the gauge of the borehole is substantially uniform along sections of the wellbore.
  • Roller reamers tools comprise a roller reamer body provided with connection means for connection with the pipes of a drill string.
  • the Roller reamer body further comprises at least one pocket for receiving a roller reamer cartridge assembly.
  • a roller reamer cartridge assembly generally comprises a shaft and a hollowed cylindrical roller disposed about the shaft such that it can rotate around the shaft, the roller being provided with reaming inserts. Roller reamer cartridge assembly have to be serviced or replaced periodically. Roller reamers cartridge assemblies are prone to worn and are detachably connected to the tool body.
  • stabilizer pads, reamer pads or roller reamer cartridge assemblies are fastened on a tool body by means of screws. Under repeated vibrations during the process of drilling, there's a possibility that some screws unscrew and that the stabilizer or the roller reamer cartridge assembly comes off and break away.
  • Document WO2004042184 discloses a rotary roller reamer comprising a pocket for receiving a roller reamer assembly including a plurality of components forming a single cartridge.
  • the cartridge is secured in the pocket by means of a single fastener device.
  • the roller reamer assembly comprises a first end comprising a plug provided with the fastening means and a second end opposed to the first end comprising a plug provided with a lug arranged to engage with a complementary shaped recess formed in a portion of the pocket. Therefore, the roller reamer cartridge assembly is inserted obliquely in the pocket such that the lug of the second end engages with the recess, and then the first end is fastened causing a pivotal movement of the roller reamer assembly.
  • Accidental unscrewing of the fastening means causes the roller reamer cartridge assembly to lift up and to be possibly detached from the reamer body.
  • US application n° 13/692901 discloses a roller reamer tool including a reamer body and a roller reamer connected to the reamer body with ball and sockets connectors. Instead of disposing a roller reamer around a shaft around which the roller reamer cutter rotates, ball and sockets connectors are located at both ends of the roller reamer which comprises pockets for insertion of the ball socket connectors. Upon rotation of the roller reamer, ball and sockets connectors are prone to wear and friction against the pocket of the reamer cutter.
  • the roller reamer tool comprises a lubrication system, wherein the socket connectors include fluid channels from the center passageway to allow the drilling fluid to lubricate mating surfaces of the ball socket connectors and the pockets of the roller reamer.
  • a lubrication means seems not very appropriate and the drilling fluid may provide corrosion and increase wearing of these mating surfaces.
  • US patent n° 4548284 discloses a roller ball retention system for a roller reamer assembly.
  • a roller reamer is mounted on a shaft which is clamped between a pocket and a mounting cap.
  • the mounting caps are installed within sockets, both sockets and mounting caps comprising facing ball races in which is inserted a set of balls.
  • the balls are inserted through a channel made into the caps and connected to the ball races.
  • Such a system is rather complicated, comprises a lot of pieces and it is mandatory to provide a set of two screws on both caps for confining the balls into their ball races.
  • Document WO2008006146 discloses a rotary roller reamer comprising a pocket for receiving a roller reamer assembly including a plurality of components forming a single cartridge.
  • the cartridge is inserted in the pocket by interference fit and is secured by two bolts.
  • a cartridge inserted in a pocket by interference fit may be sometimes hard to remove, since the tool body may be subjected to high constraint and temperature in the wellbore.
  • the aim of this invention is to provide a downhole tool assembly fulfilling this need.
  • the cartridge comprises abutment means for constraining the axial movement of each fastening element in a direction away from the tool body, and in which the dimensions of the tool cartridge relative to the dimensions of the pocket are such that there is a total clearance (C) between two opposite sides of the cartridge and the respective pocket walls facing said sides, such that C ⁇ X 2 + Y 2 - X , where C is the total pocket clearance, X is the dimension of the cartridge between said opposite sides, and Y is the depth of the pocket.
  • C total clearance
  • the total clearance (C) is the sum of two clearances. These two clearances can be equal, but the two clearances may however also be different: a first clearance C1 and a second clearance C2 which differs from the first one, the sum of the two clearances (C1 + C2) being said total pocket clearance (C).
  • the opposite sides of the cartridge can have a flat surface but one or both surfaces can also have a curved surface of any shape.
  • the opposite sides of the cartridge can be end sides substantially extending in direction which is perpendicular to the axial or longitudinal direction of the cartridge, or can be lateral sides substantially extending in said axial or longitudinal direction.
  • a cartridge in such a downhole tool assembly, can be inserted into a pocket or can be removed from it according to a preferred direction, parallel to the pocket walls facing the sides of the cartridge, whereas this insertion or removal is blocked when the cartridge is tilted to an angle exceeding a maximum angle of 10 degrees with respect to said preferred direction.
  • said maximum angle is 5 degrees, more preferably said maximum angle is 2 degrees.
  • the clearance between the lateral sides of the cartridge and the walls of the pocket is essential to provide an easier removal of the cartridge from the tool body when compared to down-hole tools of the prior art in which he cartridges are inserted in the pocket by interference fit.
  • the clearance between the pocket and the cartridge in combination with the conception of the cartridge has the further advantage that it provides a safety means in case of unintentional loosening of the fixing means.
  • two of said locations are provided along an axis intersecting said two opposite sides.
  • the sides intersected by the axis are to be considered opposite sides of the cartridge, even if these sides are not the end sides of a cartridge having an elongated shape.
  • the axis determines which sides of the cartridge are to be considered as opposite sides.
  • the direction of the axis is thus not necessarily coinciding with the longitudinal axis of the cartridge but could make any angle with it.
  • the direction of the axis could even be perpendicular to the longitudinal axis of the cartridge.
  • the fastening elements are provided in a respective hole in the cartridge and the abutment means are arranged in the holes, such that a passage is left for reaching the fastening element.
  • At least one fastening element is a bolt having a bolt shaft and a bolt head, said bolt shaft extending through a hole in the cartridge into a threaded hole in the tool body, while the bolt head is in contact with a contact surface of the cartridge.
  • said cartridge hole comprises a first section into which the bolt head is introduced, and a second section through which the bolt shaft extends, the second section having a transverse dimension which is smaller than the transverse dimension of the first section, such that a first shoulder part is formed which constitutes said contact surface for the bolt head.
  • the tool body comprises at least one pair of threaded holes in a bottom wall of the pocket
  • the cartridge comprises respective holes at corresponding locations, so that each cartridge hole is aligned with a respective threaded hole in the tool body, and the cartridge is fixed by means of respective bolts extending through each of said aligned holes.
  • the abutment means is arranged in the hole in the cartridge, such that a passage is left for reaching the bolt head.
  • the abutment means comprises a retaining ring which is inserted in the hole.
  • the abutments means may be permanently fixed inside the hole.
  • said hole in the cartridge comprises a first section into which the bolt head is introduced, a second section through which the bolt shaft extends, the second section having a transverse dimension which is smaller than the transverse dimension of the first section, such that a first shoulder part is formed which constitutes a contact surface for the bolt head, and a third section, at the side facing away from the tool body, having a transverse dimension which is smaller than the transverse dimension of the first section, such that a second shoulder part is formed which constitutes said abutment means for the bolt head.
  • a T-shaped slot is provided in a side face of the cartridge, said slot opening into the first and the second section of the hole, such that the bolt can be introduced in the hole through said T-shaped slot, into a position in which the bolt head is situated in the first section of the hole, between the first and the second shoulder part, while the bolt shaft extends through the second section of the hole.
  • edges of the cartridge are chamfered and the edges of the pocket are rounded.
  • the tool body may also have an outermost surface which is formed by raised portions in a form of blades or ribs extending longitudinally, spirally or helically along a section of the tool body, such that two adjacent raised portions define a flow path there between, while the pockets are formed into said raised portions.
  • the downhole tool assembly according to this invention preferably comprise at least one cartridge which is a roller assembly or a stabilizing pad or a reamer pad.
  • the cartridge is moved in a direction which is substantially parallel to the walls of the pocket.
  • at least one fastening element is a bolt.
  • the invention also relates to a method for disassembling a down-hole tool assembly according to this invention, said downhole tool comprising a tool body comprising at least one pocket and a pair of threaded holes, a tool cartridge inserted into said pocket being fixed by means of a first and a second fastening element extending through holes in the cartridge and screwed into a respective threaded hole in the tool body, said method comprising the step of alternately unscrewing a partial length of the first fastening element and unscrewing a partial length of the second fastening element out of its threaded hole, or synchronously unscrewing the first fastening element and the second fastening element.
  • at least one fastening element is a bolt.
  • This downhole tool assembly is a stabilizer tool assembly comprising a tool body (1) of which the outermost surface comprises raised portions (2) in the form of ribs extending helically along a section of the tool body (see figure 1 ).
  • the raised portions (2) have tapered extremities (2a),(2b).
  • Two adjacent raised portions (2) define a flow path (3) in between the raised portions.
  • a number of pockets (4) is formed into each of those raised portions (2).
  • Each pocket (4) forms a recess in the outermost surface of the tool body (1).
  • This stabilizer tool assembly further comprises a single cartridge inserted into each pocket (4).
  • this cartridge is a stabilizer pad (5).
  • the stabilizer pad (5) has an elongated shape defining an axial direction (A), with a rectangular top side (5e), preferably forming a rounded surface, and a rectangular bottom side (5f), preferably being flat, two lateral sides (5a), (5b) extending in said axial direction and two parallel end sides (5c),(5d) extending in a direction perpendicular to said axial direction (A), which will be called the longitudinal sides (5a),(5b) and the transversal sides (5c),(5d) respectively.
  • the stabilizer pad (5) comprises two holes (6),(7) located in the vicinity of a respective extremity of the stabilizer pad (5).
  • a bolt (8), (9) is inserted into each hole (6),(7) and is screwed into a respective threaded hole (10), (11) in the bottom wall (4e) of the pocket (4).
  • Each bolt (8),(9) comprises a bolt head (8a), (9a) and a bolt shaft (8b),(9b).
  • the holes (6),(7) in the cartridge (5) comprise abutments for constraining the bolts (7a),(7b) from axial movement away from the tool body (1), as will be explained below.
  • Each pocket (4) has two facing walls (4a),(4b) extending in the axial direction (A) and two parallel walls (4c),(4d) extending in a direction perpendicular to said axial direction (A), which will be called the longitudinal pocket walls and the transversal pocket walls respectively.
  • Each pocket has a flat bottom surface at a predetermined depth (Y) relative to the surface of the raised portion (2).
  • the edges of the bottom surface are preferably rounded and the edges of the cartridge are preferably tapered in order to reduce stress of the cartridge against the pocket.
  • the stabilizer pad (5) has a length (X) -the dimension in axial direction - which is smaller than the axial distance between the transversal pocket walls, such that a small clearance is obtained between each of the transversal sides (5c),(5d) of the stabilizer pad (5) and the transversal pocket wall (4c),(4d) facing it.
  • the two clearances (C/2) are equal and the sum of both partial clearances (C/2) is called the total pocket clearance (C).
  • the two clearances may also be a first clearance C1 and a second clearance C2 which differs from the first one, the sum of the two clearances being said total pocket clearance (C).
  • the total pocket clearance (C) is smaller than or equal to * X 2 + Y 2 - X .
  • the relevant dimensions (X),(Y),(C/2) have been indicated on figure 3B , in which, for reasons of clarity, the width (C/2) of the clearances and the transverse dimensions of the holes (6),(7) are drawn much greater than in reality
  • This total pocket clearance (C) allows insertion of the stabilizer pad (5) into the pocket (4) and the removal of the stabilizer pad (5) out of the pocket according to a preferred direction parallel to the walls (4a),(4b),(4c),(4d) of the pocket (4), and blocking the stabilizer pad (5) when the stabilizer pad (5) is tilted to an angle exceeding a particular maximum angle.
  • this maximum angle can be any angle below 10 degrees. In some circumstances the maximum titling angle of the stabilizer pad (5) can be any angle below 5 degrees or even below 2 degrees.
  • the bottom side (5e) of the cartridge (5) is in contact with the bottom wall (4e) of the pocket (4).
  • the height (h) of the stabilizer pad (5) i.e. the cartridge dimension measured from this bottom side (5e) in a direction perpendicular to it, is such that the major part of the cartridge (5) is inserted in the pocket (4). It is preferred (see figure 3B ) that the depth (Y) of the pocket (4) is at least 50% of the height (h) of the cartridge (5).
  • the total pocket clearance (C) between the pocket (4) and the stabilizer pad (5) is a clearance fit.
  • the term "clearance fit" means that two toleranced mating parts will always leave a space or clearance when assembled, as opposed to interference fit where two toleranced mating parts will always interfere when assembled.
  • the holes (6), (7) in the stabilizer pad (5) open in the top side (5e) and the bottom side (5f) and comprise three aligned cylindrical sections (6a),(7a); (6b),(7b);(6c),(7c).
  • a first section (6a),(7a) having the largest diameter is provided inside the cartridge material and is connected to a second section (6b),(7b) opening in the top side (5e) and a third section (6c),(7c) opening in the bottom side (5f) of the cartridge (5).
  • the diameters of the second (6b),(7b) and third sections (6c),(7c) is smaller than the diameter of the first section (6a),(7a).
  • the change of diameters occurs in a stepwise manner such that a first shoulder part (61),(71) and a second shoulder part (62),(72) are formed at the bottom side and at the top side of the first section (6a),(7a) respectively.
  • the bolt heads (8a), (9a) are placed in the first section (6a),(6b) of the respective holes (6),(7), while the bolt shafts (8b),(9b) extend through the second sections (6b),(7b) and their ends are screwed into the threaded holes (10),(11) in the bottom wall (4e) of the pocket (4).
  • the bolts (8),(9) can be introduced in the first (6a),(7a) and second sections (6b),(7b) of their holes (6),(7) through a respective T-shaped slot (12), (13) opening in a lateral side (5a) of the stabilizer cartridge (5), as shown in figure 3A .
  • This slot (12),(13) opens into the first (6a),(7a) and the second section (6b), (7b) of the holes, such that each bolt can be introduced through a T-shaped slot, into a position in which the bolt head (8a),(9a) is situated in the first section (6a),(7a) of the hole, between the first (61),(71) and the second shoulder part (71),(72), while the bolt shaft (8b),(9b) extends through the second section of the hole.
  • the first shoulder part (61),(71) constitutes a contact surface for the bolt head (8a),(9a).
  • the head of the tightened bolt (8),(9) is in contact with this contact surface and exerts a holding force onto the stabilizer pad (5).
  • the second shoulder part (62),(72) constitutes an abutment surface for the bolt head (6a),(7a), such that a loosened bolt (5),(7) is prevented from leaving the holes (6),(10);(7),(11) and is allowed to push against the abutment means (62),(72) so that the cartridge (5) is placed in a titled position in the pocket
  • the clearance between the top surface of the bolt head (8a), (9a) and the second shoulder part (62),(72) is preferably inferior to 10 % of the diameter of the bolt head (8a),(9a).
  • the clearance between the bolt head and the wall of the first cylindrical section (6a) is preferably inferior to 10% of the diameter of the bolt head (8a), (9a).
  • the third section (6c),(7c) of the holes (6),(7) leaves a passage through which the bolt heads (8a),(9a) can be reached in order to tighten or untighten the bolts (6),(7).
  • a tool such as a screwdriver or an Allen key can be inserted through this passage.
  • the holes (6),(7) only have a first section (6a),(7a) opening in the top side (5e) of the stabilizer pad (5) and a second section (6b),(7b) having a smaller than the first section (6a),(7a), opening in the bottom side (5f).
  • a first shoulder part (61),(71) is formed which constitutes a contact surface for the bolt head (8a),(9a).
  • the bolt heads (8a), (9a) are introduced in the first section (6a),(7a) in contact with the contact surface, while the bolt shafts (8b),(9b) extend through the second section (6b), (7b) and their ends are screwed into the threaded holes (10),(11) in the bottom wall (4e) of the pocket (4).
  • the heads of the tightened bolts exert a holding force onto the stabilizer pad (5).
  • the abutment is formed by a retaining ring (14),(15) which is inserted into each hole (6),(7) and which can be permanently joined to the hole by a welding or a brazing process.
  • the retaining ring is a removable snap ring (114),(115) as shown in figure 9 for a downhole tool assembly comprising a roller reamer cartridge. This embodiment will be described below in more detail.
  • the edges of the pocket (4) are rounded for minimizing stresses on the tool body (1) and the stabilizer pad (5) is chamfered for facilitating its insertion into the pocket (4).
  • This downhole tool assembly is a roller reamer tool assembly comprising a tool body (101) of which the outermost surface comprises raised portions (102) in the form of ribs extending longitudinally along a section of the tool body (see figure 5 ).
  • the raised portions (102) have tapered extremities (102a),(102b).
  • Two adjacent raised portions (102) define a flow path (103) in between the raised portions.
  • a pocket (104) is formed into each of those raised portions (2).
  • Each pocket (104) forms a recess in the outermost surface of the tool body (101).
  • This roller reamer tool assembly further comprises a single cartridge inserted into each pocket (4).
  • this cartridge is a roller reamer cartridge assembly (105).
  • This cartridge (105) has an elongated shape defining an axial direction (B) comprising a first block (1050) and a second block (1051), a shaft (1052) arranged between the first and the second block, and a hollowed cylindrical roller reamer (1053) provided with reaming inserts (1054) and arranged to rotate about said shaft (1052).
  • Each first (1051) and second block (1052) is fastened to the shaft (1053) by means of screws, by interference fit or by any other means, such that all the pieces of the roller reamer cartridge assembly form a single cartridge (105) of fixed dimensions.
  • the cartridge (105) comprises two end parts formed by the first block and the second block, and an intermediate part formed by the cylindrical roller reamer (1053) in between those blocks and protruding beyond the lateral sides formed by the lateral sides of the blocks.
  • the sides of the blocks extending in the axial direction (B) form respective lateral sides (105a),(105b) of the cartridge (105),.
  • the end sides of the blocks extending in a direction perpendicular to said axial direction (B) form respective end sides (105c),(105d) of the cartridge (105), extending in parallel planes.
  • the top surface of the blocks is curved and comprises reaming inserts (1054).
  • a portion of the roller reamer cartridge (105) protrudes beyond the surface of the raised portions (102), and a major portion of the roller reamer cartridge is inserted into the pocket (104).
  • Each pocket (104) has a shape which corresponds to the bottom shape of the cartridge (105), allowing the cartridge (105) to be inserted in the pocket, leaving a small clearance between the cartridge sides and the pocket walls facing these sides.
  • the pocket walls (104c),(104d) facing the end walls (105c),(105d) of the cartridge are parallel.
  • Each pocket has a flat bottom surface located at a predetermined depth (Y).
  • the cartridge (5) has a length (X) - the dimension in axial direction - which is smaller than the axial distance between the pocket walls, such that a small clearance is obtained between each of the end sides (105c),(105d) of the stabilizer pad (5) and the pocket wall (4c),(4d) facing it.
  • the two clearances (C/2) are equal and the sum of both partial clearances (C/2) is called the total pocket clearance (C).
  • the total pocket clearance (C) is smaller than or equal to X 2 + Y 2 - X .
  • the relevant dimensions (X),(Y),(C/2) have been indicated on figure 6 .
  • the roller reamer cartridge can be inserted into a pocket or can be removed from it according to a preferred direction, parallel to the pocket walls facing the sides of the cartridge, whereas this insertion or removal is blocked when the cartridge is tilted to an angle exceeding a maximum angle of 10 degrees with respect to said preferred direction.
  • said maximum angle is 5 degrees, more preferably said maximum angle is 2 degrees.
  • This cartridge (105) is fixed in the pocket (104) by means of two bolts (108),(109) in the same way as the stabilizing pad (5) of figures 2 , 3A and 3B .
  • Two holes (106), (107) are provided in a respective block (1051),(1052) of the roller reamer cartridge (105).
  • the holes (106),(107) open in the top side and the bottom side and comprise three aligned cylindrical sections (106a),(107a); (106b),(107b);(106c),(107c).
  • a first section (106a),(107a) having the largest diameter is provided inside the cartridge material and is connected to a second section (106b),(107b) opening in the top side, and a third section (106c),(107c) opening in the bottom side of the cartridge (105).
  • the diameters of the second (106b),(107b) and third sections (106c),(107c) is smaller than the diameter of the first section (106a),(107a).
  • the change of diameters occurs in a stepwise manner such that a first shoulder part (161),(171) and a second shoulder part (162),(172) are formed at the bottom side and at the top side of the first section (106a),(107
  • the bolt heads (108a), (109a) are placed in the first section (106a),(106b) of the respective holes (106),(107), while the bolt shafts (108b),(109b) extend through the second sections (106b),(107b) and their ends are screwed into the threaded holes (110),(111) in the bottom wall of the pocket (104).
  • the bolts (108),(109) can be introduced in the first (106a),(107a) and second sections (106b),(107b) of their respective hole (106),(107) through a respective T-shaped slot (112), (113) opening in a lateral side (105a) of the cartridge (105), as shown in figure 8 .
  • This slot (112),(113) opens into the first (106a),(107a) and the second section (106b), (107b) of the holes, such that each bolt (108),(109) can be introduced in the first section through a T-shaped slot, into a position in which the bolt head (108a),(109a) is situated between the first (161),(171) and the second shoulder part (171),(172), while the bolt shaft (108b),(109b) extends through the second section of the hole.
  • the first shoulder part (161),(171) constitutes a contact surface for the bolt head (108a),(109a).
  • the head of the tightened bolt (108),(109) is in contact with this contact surface and exerts a holding force onto the cartridge (105).
  • the second shoulder part (162),(172) constitutes an abutment surface for the bolt head (106a),(107a), such that a loosened bolt (108),(109) is prevented from leaving the holes (106),(110);(107),(111).
  • the clearance between the top surface of the bolt head (108a), (109a) and the second shoulder part (162),(172) is preferably inferior to 15 % of the diameter of the bolt head (108a),(109a).
  • the clearance between the bolt head (108), (109) and the wall of the first section (106a), (107a) is preferably inferior to 15% of the diameter of the bold head.
  • the third section (106c),(107c) of the holes (106),(107) leaves a passage through which the bolt heads (108a),(109a) can be reached in order to tighten or untighten the bolts (106),(107).
  • a tool such as a screwdriver or an Allen key can be inserted through this passage.
  • the holes (106),(107) only have a first section (106a),(107a) opening in the top side of the cartridge (5) and a second section (106b),(107b) having a diameter which is smaller than the first section (106a),(107a), opening in the bottom side.
  • a first shoulder part (161),(171) is formed which constitutes a contact surface for the bolt head (8a),(9a).
  • the abutment is formed by a snap ring (114),(115) which is inserted into a groove in each hole (106),(107).
  • the groove (116),(117) for inserting the snap ring (114),(115) is formed in the walls of the first section (106a),(107a) of the holes (106),(107), in the vicinity of the top of the hole.
  • the abutment is formed by a retaining ring which is inserted into each hole (106),(107) and which is permanently joined to the hole by a welding or a brazing process (see figure 4 ).
  • the edges of the pocket (104) are rounded for minimizing stresses on the tool body (101) and the cartridge (105) is chamfered for facilitating its insertion into the pocket (104).
  • This roller reamer assembly also comprises a downhole positive pressure equalizing lubrication system as described in applicant's patent EP1818500B1 .
  • the down-hole tool assembly is a reamer tool comprising a tool body provided with at least one pocket, forming a recess in the outermost surface of the tool body, and further comprising a single cartridge inserted into the pocket.
  • This single cartridge is a reamer pad comprising reaming inserts such as for example polycrystalline diamond cutters (PDC) arranged in a direction to ream the borehole upon rotation of the downhole tool assembly, or tungsten carbide inserts (TCI), preferably having a dome shaped outermost portion or a truncated dome shaped outermost portion arranged on the outermost surface of the reamer pad and extending in a perpendicular direction relative to that outermost surface.
  • reaming inserts such as for example polycrystalline diamond cutters (PDC) arranged in a direction to ream the borehole upon rotation of the downhole tool assembly, or tungsten carbide inserts (TCI), preferably having a dome shaped outermost portion or a truncated dome shaped outermost portion arranged on the outermost surface of the reamer pad and extending in a perpendicular direction relative to that outermost surface.
  • PDC polycrystalline diamond cutters
  • TCI tungsten carbide inserts
  • This reamer pad has an elongated shape and comprises a pair of holes preferably located at the vicinity of both extremities of the pad.
  • a pair of bolts is inserted into the holes of the reamer pad and is screwed into the tool body, in one of the ways described above.
  • the abutments for the bolts are also obtained in one of the ways described above.
  • the relevant dimensions of the reamer pad and the pocket are also determined as described above, so as to have a total pocket clearance (C) according to the present invention.
  • a downhole tool assembly such as a stabilizer tool, a reamer tool or a roller reamer tool as described herein above
  • two bolts (8),(9);(108),(109) are placed in a respective hole (6),(106);(106),(107) of each cartridge (5),(105) and each cartridge is inserted into a respective pocket (4),(104).
  • the cartridges (5),(105) are then fixed by means of the two bolts, by alternately screwing a partial length of the first bolt (8), (108) into a threaded hole (10),(110) and screwing a partial length of the second bolt (9), (109) into the other threaded hole (11),(111), or by synchronously screwing the first bolt (8),(108) and the second bolt (9),(109) into their respective threaded holes (10),(110);(11),(111).
  • the two bolts (8),(108);(9),(109) are removed from the treaded holes (10),(110);(11),(111) by alternately unscrewing a partial length of the first bolt and unscrewing a partial length of the second bolt out of its threaded hole, or by synchronously unscrewing the first bolt (8),(108) and the second bolt (9),(109).

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Drilling Tools (AREA)
  • Automatic Assembly (AREA)
  • Component Parts Of Construction Machinery (AREA)
EP14177368.9A 2014-07-17 2014-07-17 Bohrlochwerkzeug und Verfahren zum Montieren und Demontieren davon Withdrawn EP2975212A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14177368.9A EP2975212A1 (de) 2014-07-17 2014-07-17 Bohrlochwerkzeug und Verfahren zum Montieren und Demontieren davon
PCT/IB2015/055030 WO2016009299A2 (en) 2014-07-17 2015-07-03 A downhole tool assembly and a method for assembling and disassembling it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14177368.9A EP2975212A1 (de) 2014-07-17 2014-07-17 Bohrlochwerkzeug und Verfahren zum Montieren und Demontieren davon

Publications (1)

Publication Number Publication Date
EP2975212A1 true EP2975212A1 (de) 2016-01-20

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Application Number Title Priority Date Filing Date
EP14177368.9A Withdrawn EP2975212A1 (de) 2014-07-17 2014-07-17 Bohrlochwerkzeug und Verfahren zum Montieren und Demontieren davon

Country Status (2)

Country Link
EP (1) EP2975212A1 (de)
WO (1) WO2016009299A2 (de)

Cited By (1)

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GB2607048A (en) * 2021-05-26 2022-11-30 Nxg Tech Limited Cutter Assembly

Families Citing this family (1)

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CN112696187B (zh) * 2019-10-23 2022-08-09 航天科工惯性技术有限公司 一种随钻用双电池短节端头拆卸结构和方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4497384A (en) * 1982-01-04 1985-02-05 Smith International, Inc. Reamer disassembly
US4548284A (en) 1983-10-28 1985-10-22 Dresser Industries, Inc. Roller ball retention of reamer cutter assembly
WO2004042184A1 (en) 2002-11-07 2004-05-21 Extreme Machining Australia Pty Ltd An improved rotary roller reamer
US6776247B1 (en) 1999-03-26 2004-08-17 Gearhart Australia Ltd. Stabilizer tool block wear pad assembly
EP1650400A1 (de) 2004-10-20 2006-04-26 European Drilling Projects B.V. Bohrstrangstabilisator
WO2008006146A1 (en) 2006-07-12 2008-01-17 Omni Oil Technologies A roller reamer
EP1818500B1 (de) 2006-02-10 2009-12-16 Omni Oil Technologies Druckausgleichssystem
US7878273B2 (en) 2008-11-17 2011-02-01 Omni Ip Ltd. Ultra-hard drilling stabilizer
US20130133954A1 (en) * 2011-11-30 2013-05-30 Smith International, Inc. Roller reamer compound wedge retention

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130012644A1 (en) 2011-07-05 2013-01-10 Schlumberger Technology Corporation Carbon Fiber Composite Material, Oilfield Apparatus Thereof, and Method for Manufacture of The Same

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4497384A (en) * 1982-01-04 1985-02-05 Smith International, Inc. Reamer disassembly
US4548284A (en) 1983-10-28 1985-10-22 Dresser Industries, Inc. Roller ball retention of reamer cutter assembly
US6776247B1 (en) 1999-03-26 2004-08-17 Gearhart Australia Ltd. Stabilizer tool block wear pad assembly
WO2004042184A1 (en) 2002-11-07 2004-05-21 Extreme Machining Australia Pty Ltd An improved rotary roller reamer
EP1650400A1 (de) 2004-10-20 2006-04-26 European Drilling Projects B.V. Bohrstrangstabilisator
EP1818500B1 (de) 2006-02-10 2009-12-16 Omni Oil Technologies Druckausgleichssystem
WO2008006146A1 (en) 2006-07-12 2008-01-17 Omni Oil Technologies A roller reamer
US7878273B2 (en) 2008-11-17 2011-02-01 Omni Ip Ltd. Ultra-hard drilling stabilizer
US20130133954A1 (en) * 2011-11-30 2013-05-30 Smith International, Inc. Roller reamer compound wedge retention

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2607048A (en) * 2021-05-26 2022-11-30 Nxg Tech Limited Cutter Assembly
WO2022248841A1 (en) 2021-05-26 2022-12-01 Nxg Technologies Limited Cutter assembly
GB2607048B (en) * 2021-05-26 2023-05-17 Nxg Tech Limited Cutter Assembly

Also Published As

Publication number Publication date
WO2016009299A2 (en) 2016-01-21
WO2016009299A3 (en) 2016-05-19

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