WO2015019114A2 - Appareil de fond et procédé associé - Google Patents

Appareil de fond et procédé associé Download PDF

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Publication number
WO2015019114A2
WO2015019114A2 PCT/GB2014/052445 GB2014052445W WO2015019114A2 WO 2015019114 A2 WO2015019114 A2 WO 2015019114A2 GB 2014052445 W GB2014052445 W GB 2014052445W WO 2015019114 A2 WO2015019114 A2 WO 2015019114A2
Authority
WO
WIPO (PCT)
Prior art keywords
reaming
stabilising
diameter
toolstring
borehole
Prior art date
Application number
PCT/GB2014/052445
Other languages
English (en)
Other versions
WO2015019114A3 (fr
Inventor
Neil Andrew Abercrombie Simpson
Original Assignee
Neil Andrew Abercrombie Simpson
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 Neil Andrew Abercrombie Simpson filed Critical Neil Andrew Abercrombie Simpson
Priority to EP14752915.0A priority Critical patent/EP3030741A2/fr
Priority to US14/910,708 priority patent/US20160186504A1/en
Publication of WO2015019114A2 publication Critical patent/WO2015019114A2/fr
Publication of WO2015019114A3 publication Critical patent/WO2015019114A3/fr

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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
    • E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
    • 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

Definitions

  • the present invention relates to downhole apparatus and methods. More particularly, but not exclusively, embodiments of the invention relate to methods and associated downhole apparatus for stabilising a toolstring in a borehole, such as stabilising a drill string in a borehole in at least a soft portion of formation.
  • the present Applicant believes that severe step changes dog legs and other detrimental changes in bore hole geometry in hard formations can be sought to be addressed by the use of various types of existing reamer tools such as roller reamers and the like. However the present Applicant believes that in relatively soft formations containing medium to large mass objects of harder rock such as chert nodules conglomerate or boulder type materials, the use of conventional reaming techniques would not provide a satisfactory solution; especially in long sections of high angle or horizontal borehole.
  • the present Applicant has identified that borehole which has been deflected by medium to large mass objects of hard rock is very difficult to rectify after the event has occurred because any reaming tool run after the event will tend to ride over or deflect past the projecting mass further enlarging the borehole section to allow the reamer assembly past. This will provide a partial solution but will lead to severe vibration and potential wear problems when stabilised drilling tools or assemblies are rotated through this section in future drilling operations.
  • the present Applicant believes that in vertical and low angle borehole this situation may not be such a major issue; but in high angle and horizontal borehole it will be.
  • the present Applicant believes that, for example, if long sections of borehole suffer from this problem then it will lead to poor rates of drill bit penetration due to hang up on the stabilisation and other components in the drilling assembly.
  • the present Applicant believes that it will also lead to severe vibration and consequent damage of drilling assembly components such as the rotary steerable system and its associated onboard electronics as well as damage to the PDC cutting structure of the drill bit shortening the drill bit run life.
  • a method of stabilising at least a portion of downhole toolstring may comprise stabilising the portion of downhole toolstring whilst an apparatus and/or the portion of downhole toolstring is/are in and/or passing through a soft formation.
  • the soft formation may comprise a relatively soft formation, such as in comparison to hard inclusions in the soft formation, such as boulder type materials, conglomerates, cherts or other nodules, or the like.
  • the method may comprise stabilising the portion of downhole toolstring whilst the apparatus and/or the portion of downhole toolstring are in and/or passing through a soft formation with hard inclusions.
  • the method may comprise reaming the hard inclusions.
  • the method may comprise reaming the hard inclusions with a reaming portion of a downhole apparatus whilst a stabilising portion of the downhole apparatus stabilises the reaming portion and/or the portion of downhole toolstring.
  • the method may comprise a stabilised method of reaming.
  • the method may comprise reducing, minimising and/or preventing deflection or deviation of a borehole, such as deflection or deviation attributable to a hard inclusion in a relatively soft formation.
  • the method may comprise reaming hard inclusions projecting into the borehole or into the intended path of the borehole, such as hard inclusions around which a drill bit and/or BHA may have at least partially deflected.
  • the method may comprise substantially only reaming hard inclusions in a soft formation.
  • the method may comprise only reaming hard inclusions in a soft formation.
  • the method may comprise stabilising the portion of toolstring against a borewall/s of soft formation.
  • the method may comprise substantially not reaming the soft formation.
  • the method may comprise stabilising and/or reaming at or to a gauge or diameter substantially similar to the gauge of pre-drilled borehole.
  • the method may comprise stabilising and/or reaming at or to a gauge or diameter substantially similar to and just less than the gauge of pre- drilled borehole.
  • the method may comprise stabilising at a maximum diameter 0.020" to 0.030" below borehole diameter.
  • the method may comprise stabilising with a stabilising portion with a major crown length diameter of 0.020" to 0.030" below borehole diameter.
  • the method may comprise stabilising with a fixed stabilising portion.
  • the method may comprise stabilising with a stabilising portion without a possibility of relatively moving parts, such as for extension, expansion or retraction of the stabilising portion.
  • the method may comprise reaming of hard inclusions with a reaming portion extending up to almost full gauge diameter.
  • the method may comprise reaming of hard inclusions with a reaming portion extending up to almost full gauge diameter of the apparatus.
  • the method may comprise reaming with a reaming portion that terminates just before the major diameter crown length of the stabilising portion of the apparatus.
  • the method may comprise reaming with a reaming portion extending from a lesser outer reaming diameter up to maximum outer reaming diameter.
  • the maximum outer reaming diameter may be less than the full gauge diameter of the borehole.
  • the maximum outer reaming diameter may be less than the full gauge diameter of the apparatus.
  • the lesser outer reaming diameter may correspond to a lesser outer diameter of the toolstring, such as an outer diameter of a tubular or drill collar or the like.
  • the method may comprise reaming with a reaming portion extending along a leading axial portion of an upset portion of an apparatus.
  • the method may comprise reaming with a reaming portion that extends or projects outwards from the lesser outer diameter of the toolstring, such as the outer diameter of the tubular or drill collar or the like.
  • the method may comprise reaming with an angled reaming portion extending axially backwards and radially outwards along the leading axial portion of an upset portion.
  • the method may comprise reaming with a reaming portion with a shallow lead angle up to the crown of the upset portion.
  • the method may comprise initially reaming with a part or surface of the reaming portion at or close to the diameter of the toolstring, such as of similar minimal diameter to a drill collar, tubular or the like.
  • Initially reaming at or close to the diameter of the toolstring may allow reaming and movement of the apparatus in an axial (e.g. downhole) direction when a hard inclusion is encountered.
  • the present invention stabilises or bears against the soft formation diametrically opposite the hard inclusion, without reaming said soft formation diametrically opposite the hard inclusion.
  • the apparatus may be supported proximal the reaming portion, such as stabilised in the borehole by the stabilising portion.
  • the method may comprise stabilising the apparatus.
  • the method may comprise reaming with a reaming portion directly adjacent the stabilising portion for stabilising.
  • the method may comprise stabilising the apparatus/toolstring directly behind the reaming portion, behind being taken in the direction of transit of the apparatus/toolstring.
  • the method may comprise stabilising the toolstring/apparatus uphole and/or downhole of the reaming portion.
  • the method may comprise initially reaming with a part or surface of the reaming portion at or close to the diameter of the toolstring, such as of similar minimal diameter to a drill collar, tubular or the like. Initially reaming at or close to the diameter of the toolstring may allow reaming and movement of the apparatus in an axial (e.g.
  • the present invention continues in a path aligned with the borehole at least during initial reaming of the hard inclusion; and optionally continues in the path aligned with the borehole at least during reaming up to the maximum diameter of the reaming portion.
  • the method may comprise stabilising the toolstring/apparatus adjacent the reaming portion such that the reaming portion is substantially prevented from deviating or deflecting from a path aligned with the borehole.
  • the method may comprise stabilising the toolstring/apparatus adjacent the reaming portion with a stabilising portion of larger diameter than the reaming portion.
  • the larger diameter stabilising portion may comprise a non-aggressive bearing outer surface such that the stabilising portion bears on the formation rather than reaming or eroding the formation.
  • the method may comprise reaming with a reaming portion of lesser diameter in advance of stabilising with a stabilising portion of greater diameter.
  • the method may comprise reaming with the reaming portion of lesser diameter in advance of stabilising with the stabilising portion of greater diameter as the apparatus/toolstring transits downhole, such as during drilling with a drillstring.
  • the method may comprise reaming with the reaming portion of lesser diameter in advance of stabilising with the stabilising portion of greater diameter as the apparatus/toolstring transits uphole, such as during retrieval or pulling of a drillstring.
  • the method may comprise stabilising with a stabilising portion sandwiched between or flanked by two reaming portions. The stabilising portion may be directly sandwiched or flanked by the two reaming portions.
  • a downhole apparatus for stabilising at least a portion of downhole toolstring in a borehole.
  • the apparatus may be configured to stabilise the portion of downhole toolstring whilst the apparatus and/or the portion of downhole toolstring are in and/or passing through a soft formation.
  • the apparatus may comprise a fixed apparatus.
  • the apparatus may comprise a fixed diameter or fixed gauge apparatus.
  • the apparatus may comprise a stabiliser.
  • the stabiliser may comprise a fixed stabiliser.
  • the stabiliser may comprise a fixed blade stabiliser.
  • the fixed apparatus may be moveable with the toolstring, such as up and/or downhole and by rotation, such as by a rotary table or downhole motor or the like.
  • the apparatus may comprise a throughbore, such as for the passage of fluid therethrough.
  • the throughbore may be for the passage of drilling fluid, wellbore fluid, injection fluid or the like.
  • the apparatus may comprise upper and/or lower connections, such as threaded box connections, for connection to upper and lower portions of toolstring, such as tubulars, drill collars, or the like.
  • the apparatus may comprise upper and/or lower body portion, such as body portion/s of similar outer diameter to the upper and/or lower portions of toolstring.
  • the apparatus may be configured to stabilise the portion of downhole toolstring whilst the apparatus and/or the portion of downhole toolstring is/are in and/or passing through a soft formation.
  • the apparatus may be configured to stabilise the portion of downhole toolstring whilst the apparatus and/or the portion of downhole toolstring is/are in and/or passing through a soft formation with hard inclusions, such as chert, conglomerates, nodules or the like.
  • the apparatus may be configured to stabilise in soft formation and ream hard inclusions, such as ledges or mass projections into the borehole.
  • the apparatus may comprise one or more upset portion/s extending radially from a lesser outer diameter of the apparatus to a maximum outer diameter of the apparatus.
  • the one or more upset portion/s may comprise a reaming portion/s and/or a stabilising portion/s.
  • a single upset portion may comprise the reaming portion/s and the stabilising portion/s.
  • the single upset portion may comprise two reaming portions (e.g. for downhole and uphole reaming) and a single stabilising portion positioned or sandwiched between the two reaming portions.
  • a plurality of upset portions may comprise the reaming portion/s and the stabilising portion/s.
  • a first upset portion may comprise a downhole reaming portion for reaming in a downhole direction; and a second upset portion may comprise the stabilising portion.
  • the apparatus may comprise a third upset portion comprising an uphole reaming portion for reaming in an uphole direction.
  • the second upset portion may comprise the stabilising portion and one of the reaming portions, such as the uphole reaming portion.
  • the plurality of upset portions may be closely coupled.
  • the plurality of upset portions may be provided by or on a plurality of tools, such as a plurality of subs that may be (directly) connected together.
  • the plurality of upset portions may be provided in a piggy back or sleeve type arrangement.
  • the apparatus may comprise a maximum outer diameter for stabilising and/or reaming at or to a gauge or diameter substantially similar to the gauge of pre-drilled borehole.
  • the upset portion/s may be configured to stabilise and/or ream at or to a gauge or diameter substantially similar to and just less than the gauge of pre-drilled borehole.
  • the stabilising portion/s may comprise a maximum diameter 0.020" to 0.030" below borehole diameter.
  • the reaming portion may be provided along an axial length of the apparatus, the axial length extending in the axial direction of the borehole.
  • the reaming portion may be provided on a progressive angled section of the upset portion, extending rearwards and outwards from a leading or front section of the upset portion.
  • the reaming portion may comprise an aggressive surface.
  • the reaming portion may comprise an array of pockets formed to accommodate reaming inserts, such as diamond impregnated carbide inserts.
  • the reaming portion may comprise diamond inserts, such as domed diamond inserts. Only the reaming portion may comprise domed diamond inserts.
  • the diamond inserts may comprise saddle inserts.
  • the upset portion may comprise grooves or spiralled slots, such as to accommodate fluid and cutting debris bypass.
  • the grooves or spiralled slots may extend axially along the upset portion, such as adjacent bearing surface/s of the stabilising portion.
  • the stabilising portion may comprise a non-aggressive surface, such as a non- aggressive hard facing.
  • the stabilising portion may comprise a bearing surface/s.
  • the stabilising portion may comprise only of bearing surface/s.
  • the stabilising portion may comprise carbide plaquet hard facing along the crown length of the stabilising portion.
  • the stabilising portion may comprise pockets for receiving inserts.
  • the stabilising portion may comprise an array of pockets for receiving stabilising diamond inserts.
  • the stabilising diamond inserts may comprise flat or flattened diamond inserts, such as to provide flat, non-aggressive bearing surface/s.
  • the stabilising diamond inserts may be ground or configured to define the maximum outer diameter or gauge of the stabilising portion.
  • the stabilising diamond inserts may be ground or configured after insertion in the pockets to define the maximum outer diameter or gauge of the stabilising portion.
  • the stabilising diamond inserts may be configured to only project minimally from the pockets.
  • the stabilising diamond inserts may be configured to project no more than 3mm, 2mm or 1 mm from the pockets.
  • the upset portion may comprise a transition portion between the reaming portion and the stabilising portion.
  • the transition portion may be configured to protect or shield the stabilising portion.
  • the transition portion may provide a lee or shield for the stabilising portion.
  • the transition portion may comprise an aggressive portion.
  • the transition portion may comprise diamond inserts, such as domed and/or saddle diamond inserts.
  • the transition portion may comprise a steeper angle relative to at least part of the reaming portion, such as immediately prior to the transition portion.
  • the transition portion may comprise a chamfered collar or shoulder projecting radially outwards fore of the stabilising portion.
  • the apparatus may be configured to substantially only ream hard inclusions in a soft formation.
  • the apparatus may be configured to only ream hard inclusions in a soft formation.
  • the apparatus may be configured to stabilise the portion of toolstring against a borewall/s of soft formation.
  • the apparatus may be configured to substantially not ream the soft formation.
  • the apparatus may be configured to not ream the soft formation.
  • the apparatus may be configured to stabilise and/or ream at or to a gauge or diameter substantially similar to the gauge of pre-drilled borehole.
  • the stabilising portion may comprise a major crown length diameter substantially similar to the gauge of pre-drilled borehole.
  • the major crown length diameter may be substantially similar to and just less than the gauge of pre-drilled borehole.
  • the stabilising portion may comprise a major crown length diameter of 0.020" to 0.030" below borehole diameter.
  • the stabilising portion may comprise a fixed stabilising portion.
  • the stabilising portion may comprise no relatively moving parts, such as for extension, expansion or retraction of the stabilising portion.
  • the reaming portion may comprise a fixed reaming portion.
  • the reaming portion may comprise no relatively moving parts, such as for extension, expansion or retraction of the reaming portion.
  • the reaming portion may extend up to almost full gauge diameter.
  • the reaming portion may extend up to almost full gauge diameter of the apparatus.
  • the reaming portion may terminate just before the major diameter crown length of the stabilising portion of the apparatus.
  • the reaming portion may extend from a lesser outer reaming diameter up to maximum outer reaming diameter.
  • the maximum outer reaming diameter may be less than the full gauge diameter of the borehole.
  • the maximum outer reaming diameter may be less than the full gauge diameter of the apparatus.
  • the lesser outer reaming diameter may correspond to a lesser outer diameter of the toolstring, such as an outer diameter of a tubular or drill collar or the like.
  • the reaming portion may terminate at a diameter just before the major diameter crown length of the stabilising portion of the apparatus.
  • the maximum outer reaming diameter may be less than the maximum outer diameter of the stabilising portion of the apparatus.
  • the apparatus may comprise no reaming portion at its maximum outer diameter or gauge.
  • the apparatus may comprise no aggressive reaming portion or surface at its maximum outer diameter or gauge.
  • the apparatus may comprise only non-aggressive surface/s at its maximum outer diameter or gauge.
  • the reaming portion may extend or run along a leading axial portion of the upset portion of the apparatus.
  • the reaming portion may extend or project outwards from the lesser outer diameter of the toolstring, such as the outer diameter of the tubular or drill collar or the like.
  • the reaming portion may comprise an angled reaming portion extending axially backwards and radially outwards along the leading axial portion of the upset portion.
  • the reaming portion may comprise a shallow lead angle up to the crown of the upset portion.
  • the reaming portion may be directly adjacent the stabilising portion for stabilising.
  • the stabilising portion may be directly behind the reaming portion, behind being taken in the direction of transit of the apparatus/toolstring.
  • the apparatus may comprise a reaming portion of lesser diameter for reaming in advance of stabilising with a stabilising portion of greater diameter.
  • the method may comprise reaming with the reaming portion of lesser diameter in advance of stabilising with the stabilising portion of greater diameter as the apparatus/toolstring transits downhole, such as during drilling with a drillstring.
  • the method may comprise reaming with the reaming portion of lesser diameter in advance of stabilising with the stabilising portion of greater diameter as the apparatus/toolstring transits uphole, such as during retrieval or pulling of a drillstring.
  • the method may comprise stabilising with a stabilising portion sandwiched between or flanked by two reaming portions.
  • the stabilising portion may be directly sandwiched or flanked by the two reaming portions.
  • the apparatus may comprise an apparatus for directional drilling.
  • the apparatus may comprise a reaming stabiliser.
  • the upset portion may be comprised in or on the reaming stabiliser.
  • the apparatus may comprise a stabilised reamer.
  • the upset portion may be comprised on the stabilised reamer.
  • the apparatus may comprise combining non-aggressive stabilisation with active aggressive diamond or diamond impregnated reaming capability in the same tool or coupled in very close proximity in order to create a stabilised method of reaming through chert nodules, conglomerates and boulder type materials in other wise relatively soft formations with minimum borehole deflection.
  • the apparatus may comprise a new hybrid fully stabilised diamond drilling reamer tool with unique geometry developed to provide optimum stabilisation and stabiliser life while being capable of reaming medium to large mass objects of harder rock such as chert nodules conglomerate or boulder type materials in relatively soft formations with minimum deflection or enlargement of the borehole.
  • a toolstring comprising at least one downhole apparatus according to any other aspect.
  • the toolstring may comprise a plurality of downhole apparatus according to any other aspect.
  • the apparatus may be mounted near-bit and/or more distal to the bit.
  • the apparatus may comprise a near-bit stabiliser.
  • the apparatus may comprise a string stabiliser.
  • the toolstring may comprise a Bottom Hole Assembly (BHA).
  • BHA Bottom Hole Assembly
  • the BHA may comprise the plurality of downhole apparatus.
  • Each apparatus of the toolstring or BHA may comprise a similar apparatus.
  • each apparatus may comprise a similar gauge.
  • the apparatus may be different, such as of dissimilar gauge.
  • the toolstring may comprise a single downhole apparatus according to any other aspect.
  • the toolstring may comprise a BHA with the single downhole apparatus according to any other aspect.
  • the toolstring may comprise a drill string.
  • the drill string may comprise a directional drill string.
  • the invention includes one or more corresponding aspects, embodiments or features in isolation or in various combinations whether or not specifically stated (including claimed) in that combination or in isolation.
  • features recited as optional with respect to the first aspect may be additionally applicable with respect to any of the other aspects or embodiments, without the need to explicitly and unnecessarily list those various combinations and permutations here.
  • features recited with respect to an upset portion of one aspect may be applicable to the upset portion of another aspect, and vice-versa.
  • the features recited in respect of any apparatus aspect or embodiment may be similarly applicable to a method aspect or embodiment, and vice-versa.
  • the apparatus may be configured to perform any of the functions or steps of a method aspect; and/or a method aspect may comprise any/all of the functions or steps associated with an apparatus aspect.
  • one or more embodiments/aspects may be useful instabilising.
  • one or more embodiments/aspects may be useful in stabilising a toolstring in a borehole, such as stabilising a drill string in a borehole in at least a soft portion of formation.
  • Figure 1 shows an apparatus according to a first embodiment of the present invention, in the form of a hybrid stabiliser unit showing the combination of a diamond insert set shallow lead angle up to a crown length diameter where diamond inserts are set to cover a transition between a leading edge of a hard faced crown and a hard faced non-aggressive stabilised section of the crown length;
  • Figure 2 shows a saddle style domed diamond impregnated insert
  • Figure 3 shows a hemispherical dome diamond impregnated insert
  • Figure 4 shows a semi domed diamond impregnated insert
  • Figure 5 shows an isometric view an apparatus according to an embodiment of the present invention, in the form of a hybrid stabilised drilling reamer body with no diamond inserts installed to show insert pocket position and body geometry;
  • Figure 6 shows an enlarged view of figure 5
  • Figure 7 shows a further enlarged view of figure 6 with diamond impregnated inserts installed into the insert pockets and non-aggressive type hard facing applied to the crown length of the hybrid stabilised drilling reamer tool;
  • Figure 8 shows a schematic sketch of a borehole section 19 passing through relatively soft formation containing medium to large mass objects such as chert nodules, conglomerate or boulder type rock material where these large mass object have caused borehole deflection;
  • Figure 9 shows a schematic sketch of the same section of borehole 19 showing a hybrid stabilised diamond drilling reamer tool having reamed off one rock projection approaching the next hard rock projection;
  • Figure 10 shows a schematic view of an embodiment of the present in vention in the form of a close coupled diamond impregnated fixed blade reamer connected to a conventional shortened oilfield stabiliser (Big sub or Dog sub).
  • a downhole apparatus for stabilising at least a portion of downhole toolstring in a borehole.
  • the apparatus is configured to stabilise the portion of downhole toolstring whilst the apparatus is in a soft formation with hard inclusions, such as chert, conglomerates, nodules or the like.
  • the apparatus comprises a reaming portion for reaming the hard inclusions; and a stabilising portion for stabilising the reaming portion whilst reaming, as is explained in more detail below.
  • FIG. 1 is of a stabilised diamond drilling reamer tool which combines in one integral body the stability of a conventional drilling stabiliser technology with the reaming capability of diamond inserts which may be in the form of poly crystalline diamond compact type inserts or diamond impregnated carbide post type inserts. Due to the high probability of intermittent cutting and high impact loads together with the fact that chert and conglomerate or boulder type mass objects are extremely hard, diamond impregnated carbide post type inserts are the preferred option.
  • the integral non aggressive stabilised section of the body 1 will provide a stable rotating axis in line with the borehole which will not be easily deflected in softer formation, providing a stable rotating platform for the integral reaming section made up of diamond impregnated carbide inserts 12 and 13 set into the shallow lead angle up to the crown to cut away any projections of hard rock ledges within the borehole.
  • This is in contrast to conventional roller reamers or diamond set fixed cutter reamers, which have the ability to ream on their major outer diameter: because their ability to cut on their outer diameter will cause them to cut the softer formation in preference to the hard rock projections and ledges, leading to bore hole enlargement and borehole deflection.
  • FIG. 5 shows the body 1 of the preferred embodiment prior to the installation of diamond impregnated carbide inserts and the application of carbide plaquet hard facing along the crown length.
  • This body 1 takes the form of a drilling stabiliser with a through bore and threadable connection means 3 and 4 at each end.
  • the upper and lower sections 2 and 2a having a diameter compatible with the drilling tubulars onto which it is connected.
  • the upset portion in the middle differing from a conventional drilling stabiliser in that it has a progressive angled section 5,6,7,8 leading up to the crown length diameter of the main body 1 as opposed to a shorter more steeply sloped lead from the upper and lower section diameters 2 and 2a to the crown length on the major diameter of the upset portion of the main body 1.
  • This progressive angled section 5,6,7 and 8 comprises an array of pockets 11 formed to accommodate diamond impregnated carbide insert 12, 13 or 14. Spiralled slots 10 are machined into the main body 1 through the upset central portion to accommodate fluid and cutting debris bypass.
  • the progressive angled section 5,6,7 and 8 terminates just before the major diameter crown length with chamfered section 5 that has a series of pockets formed to accommodate diamond impregnated carbide inserts of the saddle style type 12 or of the semi domed type 14 in order to protect the transition from the aggressive diamond cutting structure to the non-aggressive carbide plaquet hard faced crown length or stabiliser section of the tool.
  • chamfered section 5 that has a series of pockets formed to accommodate diamond impregnated carbide inserts of the saddle style type 12 or of the semi domed type 14 in order to protect the transition from the aggressive diamond cutting structure to the non-aggressive carbide plaquet hard faced crown length or stabiliser section of the tool.
  • fig 7 this can be more clearly seen with inserts 12 set into these pockets.
  • the hard faced stabilised section of the crown length on the major diameter can also be seen with the carbide plaquets 15 evenly distributed and held in place by metal carbide powder 16.
  • This crown length section being a ground finish to 0.020" to 0.030" below
  • the stabilising portion comprises pockets for receiving inserts.
  • the stabilising portion comprises an array of pockets for receiving stabilising diamond inserts.
  • the stabilising diamond inserts comprise flat or flattened diamond inserts, such as to provide flat, non- aggressive bearing surface/s.
  • the stabilising diamond inserts are ground or configured to define the maximum outer diameter or gauge of the stabilising portion.
  • the stabilising diamond inserts are ground or configured after insertion in the pockets to define the maximum outer diameter or gauge of the stabilising portion.
  • the stabilising diamond inserts are configured to only project minimally from the pockets.
  • the stabilising diamond inserts are configured to project no more than 3mm, 2mm or 1 mm from the pockets.
  • FIG 8 shows a conventional stabiliser 21 in a borehole 19 drilled though relatively soft formation containing chert nodules 18 which have caused borehole deflections 20 and protrusions or ledges 23 projecting into the borehole. It can be seen that if the rotating drill string and conventional stabiliser 21 progresses to the next protrusion or ledge 23 that the unprotected angular lead up or leading edge 22 will be vulnerable to damage as it rotates into the protrusion or ledge 23. This is the normal mode of failure for conventional stabilisers in this environment.
  • Figure 9 shows a hybrid stabilised diamond drilling reamer tool 24 in a borehole 19 drilled though relatively soft formation containing chert nodules 18 which have projected into the borehole path to potentially cause protrusions or ledges the first having been reamed away and the second to be reamed by the diamond .
  • the diamond impregnated carbide inserts 12 and 13 mounted on the shallow sloping leading edge of the hybrid stabilised diamond drilling reamer tool between the upper and lower diameters 2 and 2a and the major diameter hard face crown length section.
  • fig 10 which shows a close coupled diamond reamer tool 7 with threadable means 3 and 4 at either end and similar diamond impregnated carbide insert cutting structure 12 and 13 mounted onto a shallow taper between the drill string diameter and the borehole diameter connected to a conventional shortened drill string stabiliser with non-aggressive hard facing along its crown length.
  • inventive aspect of this invention is the close coupling of an aggressive and progressive diamond reaming structure in very close proximity to a non-aggressive stabiliser structure and this can be achieved in a number of ways.
  • Figure 10 shows only half of the arrangement, with a mirror-image replicated to the right hand side of the figure. Another half of the stabiliser is mirrored, together with a mirror image reaming portion or sub. Accordingly the arrangement of Figure 10 allows stabilised reaming or reamed stabilisation in both uphole and downhole directions, with a leading portion of lesser diameter always comprising a reaming portion for initial contact of inclusions at a diameter less than the stabilising diameter of the major crown diameter.
  • the close coupling of stabilising and reaming capability in one tool or short assembly provides a system which can substantially improve drilling performance and stabiliser life in difficult formations containing large medium to large mass hard rock objects in otherwise relatively soft formation.
  • any of the aforementioned tools may have other functions in addition to the mentioned functions, and that these functions may be performed by the same tool.
  • features have been described as downhole or uphole; or proximal or distal with respect to each other, the skilled person will appreciate that such expressions may be interchanged where appropriate.
  • the apparatus or string may move downhole in the embodiments shown; in additional or alternative embodiments or operations, the apparatus or string may move uphole.

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  • 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)
  • Vehicle Body Suspensions (AREA)

Abstract

L'invention concerne un procédé de stabilisation d'au moins une partie d'un chapelet d'outils de fond et un appareil associé. Le procédé comprend la stabilisation de la partie du chapelet d'outils de fond alors qu'un appareil et/ou la partie du chapelet d'outils de fond est/sont dans et/ou traverse(nt) une formation souple comprenant des inclusions dures. Le procédé comprend l'alésage des inclusions dures avec une partie d'alésage d'un appareil de fond alors qu'une partie de stabilisation de l'appareil de fond stabilise la partie d'alésage et/ou la partie du chapelet d'outils de fond.
PCT/GB2014/052445 2013-08-08 2014-08-08 Appareil de fond et procédé associé WO2015019114A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14752915.0A EP3030741A2 (fr) 2013-08-08 2014-08-08 Appareil de fond et procédé associé
US14/910,708 US20160186504A1 (en) 2013-08-08 2014-08-08 Downhole apparatus and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1314266.6 2013-08-08
GBGB1314266.6A GB201314266D0 (en) 2013-08-08 2013-08-08 Hybrid diamond Reamer Stabiliser

Publications (2)

Publication Number Publication Date
WO2015019114A2 true WO2015019114A2 (fr) 2015-02-12
WO2015019114A3 WO2015019114A3 (fr) 2015-05-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2014/052445 WO2015019114A2 (fr) 2013-08-08 2014-08-08 Appareil de fond et procédé associé

Country Status (4)

Country Link
US (1) US20160186504A1 (fr)
EP (1) EP3030741A2 (fr)
GB (1) GB201314266D0 (fr)
WO (1) WO2015019114A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10704331B2 (en) * 2017-03-10 2020-07-07 Patrick Patrick Reilly Reamer for use in drilling operations
US10837237B2 (en) 2017-11-30 2020-11-17 Duane Shotwell Roller reamer with labyrinth seal assembly
AU201812056S (en) * 2018-04-09 2018-05-01 Cobalt Extreme Pty Ltd A rod coupler
AU201815863S (en) * 2018-10-02 2018-11-06 Cobalt Extreme Pty Ltd A Coupler
USD954754S1 (en) * 2020-02-28 2022-06-14 Cobalt Extreme Pty Ltd Rod coupler

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231437A (en) * 1979-02-16 1980-11-04 Christensen, Inc. Combined stabilizer and reamer for drilling well bores
CA1154430A (fr) * 1981-08-21 1983-09-27 Paul Knutsen Outil de foration a lame incorporee avec calibre cylindrique stabilisateur de l'effort de rognage
US4467879A (en) * 1982-03-29 1984-08-28 Richard D. Hawn, Jr. Well bore tools
US5474143A (en) * 1994-05-25 1995-12-12 Smith International Canada, Ltd. Drill bit reamer stabilizer
AU2002951839A0 (en) * 2002-09-30 2002-10-24 Transco Manufacturing Australia Pty Ltd Combined reamer and drill bit stabiliser
WO2010088489A1 (fr) * 2009-01-30 2010-08-05 Baker Hughes Incorporated Procédés, systèmes et ensembles outil pour répartir un poids sur l'outil entre un trépan de forage terrestre rotatif pilote et un dispositif aléseur
AU2012203201A1 (en) * 2011-06-02 2012-12-20 Adel Bassal Improved reamer stabiliser

Also Published As

Publication number Publication date
WO2015019114A3 (fr) 2015-05-28
US20160186504A1 (en) 2016-06-30
EP3030741A2 (fr) 2016-06-15
GB201314266D0 (en) 2013-09-25

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