EP3510233B1 - Extended directional drilling - Google Patents

Extended directional drilling Download PDF

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Publication number
EP3510233B1
EP3510233B1 EP17780629.6A EP17780629A EP3510233B1 EP 3510233 B1 EP3510233 B1 EP 3510233B1 EP 17780629 A EP17780629 A EP 17780629A EP 3510233 B1 EP3510233 B1 EP 3510233B1
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EP
European Patent Office
Prior art keywords
drillpipe
drilling fluid
buoyancy
unit
module
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.)
Active
Application number
EP17780629.6A
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German (de)
English (en)
French (fr)
Other versions
EP3510233A2 (en
Inventor
Rüdiger KÖGLER
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.)
Perforator GmbH
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Perforator GmbH
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Filing date
Publication date
Application filed by Perforator GmbH filed Critical Perforator GmbH
Publication of EP3510233A2 publication Critical patent/EP3510233A2/en
Application granted granted Critical
Publication of EP3510233B1 publication Critical patent/EP3510233B1/en
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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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • E21B7/046—Directional drilling horizontal drilling

Definitions

  • the present invention relates to a drillpipe module for drilling a borehole in ground, to a system for drilling such a borehole in ground including drillpipe modules, to a control unit and an operation unit for use in drilling such a borehole in ground, to a method for drilling such a borehole in ground to a corresponding computer program.
  • a pipe structure comprising inner and outer pipe sections that are coaxial with each other is disclosed in US 2012/0031616 A1 .
  • a cylindrical truss structure may be disposed between the inner and outer pipe sections to provide support to the pipe structure while reducing weight.
  • Such a pipe structure may be used to form lightweight drill pipe that may be used in oil, gas, geothermal, and horizontal drilling.
  • a drill rod for use in making up a drill string for drilling holes in the Earth's crust in the presence of drilling mud is formed with a buoyancy space which can be filled with liquid, such as water, less dense than the drilling mud to reduce the weight of the rod when immersed in the mud.
  • a vent hole is provided at the bottom of the buoyancy space to equalise the pressures in the buoyancy space and in the surrounding mud.
  • a further closable vent is provided at the top of the buoyancy space to permit air to vent from the buoyancy space when it is primed with the buoyancy liquid.
  • WO 86/04950 A1 discloses a drilling pipe for making of a drill string, in particular for deviation drilling, comprising an outer tube and an inner tube connected to heads on each end, in such a manner that the inner tube communicates with apertures through each head, and in such a manner that a closed cavity is constituted between the tubes, said cavity contributing to give the drilling pipe and the drill string a buoyancy in the bore hole.
  • an approach for extending the reach in creating a borehole in ground where there are provided an inner pipe and an outer pipe having an annular region therebetween, while the inner pipe is used for exerting (axial) force on just a drilling head and not on the outer pipe, save for a tensional force on the outer pipe provided by a clamp and a bearing, while the outer pipe is advanced separately therefrom by means of an axial force exerted from the outside.
  • the annular region between the inner and the outer pipe is filled with air or the like, the effective weight of the drilling arrangement in the borehole is significantly reduced, thus reducing a friction between the wall of the borehole and the outer pipe. The reduced friction allows for a longer range.
  • An aim underlying the present invention is to allow for an extension in particular in term of reach of a drilling in ground in comparison to conventional trenchless approaches.
  • a system for drilling a borehole in ground is proposed as defined in claim 8, in particular comprising a plurality of buoyancy enhanced drillpipe modules according to the invention and a drilling head arranged for being attached to a drillpipe formed by the plurality of drillpipe modules.
  • a control unit for use in drilling a borehole in ground with a drillpipe including a plurality of buoyancy enhanced drillpipe modules is proposed as defined in claim 9, wherein drilling fluid is provided through the passage of the drillpipe to a drilling head and the drillpipe is immersed in debris laden drilling fluid returning from a work face of the drilling head, wherein the control unit is arranged for outputting control signals for controlling the density of the debris laden drilling fluid for adjusting the effective weight of the drillpipe by adjusting a density of the drilling fluid provided through the passage, adjusting a pump rate of the drilling fluid through the passage and/or adjusting a rate of advancement of the drillpipe.
  • an operation unit for use in drilling a borehole in ground with a drillpipe including a plurality of buoyancy enhanced drillpipe modules is proposed as further defined in claim 9, wherein drilling fluid is provided through the passage of the drillpipe to a drilling head and the drillpipe is immersed in debris laden drilling fluid returning from a work face of the drilling head, wherein the operation unit includes means for adjusting a density of the drilling fluid provided through the passage, adjusting a pump rate of the drilling fluid through the passage and/or adjusting a rate of advancement of the drillpipe, so to control the density of the debris laden drilling fluid for adjusting the effective weight of the drillpipe, wherein the operation unit is arranged to operate the means in response to control signals.
  • a method for drilling a borehole in ground is proposed as defined in claim 10, in particular comprising the steps of providing a plurality of buoyancy enhanced drillpipe modules according to the invention forming a drillpipe and a drilling head attached to the drillpipe, advancing the drillpipe with the drilling head being pushed and/or turned, wherein drilling fluid is provided through the combined passages the plurality of drillpipe modules to the drilling head, the drilling fluid returning as debris laden drilling fluid immersing the drillpipe.
  • the arrangement of the buoyancy enhanced drillpipe module of the present invention addresses the stability of the overall drillpipe and thus the applicable force by taking into consideration a ratio between the absolute value of the effective weight of the drillpipe (module) and its ability to withstand and conduct an axial force.
  • the provision of the buoyancy unit allows for a reduction of the absolute value of the effective weight force of the drillpipe when immersed in (debris laden) drilling fluid.
  • the modular design allows not only for a simple assembling when in use but also give further advantages.
  • the provision of the connection units improve the overall strength of a drillpipe formed by the drillpipe modules against buckling, similar to the nodes in a bamboo stem.
  • the modular design limits a failure in the outer pipe in which debris laden drilling fluid enters though the outer pipe to just one module, allowing for the drilling to be continued.
  • the drillpipe modules are designed such that a neutral lift occurs within such range, rather than at one of the extremes thereof.
  • the reachable drilling range may be optimized, the (average of the) absolute value of the effective weight force being as small as possible throughout the different conditions resulting in differing density of the debris laden drilling fluid.
  • the present invention may be realized by using drilling fluid having a conventional density in the range of 1.0 to 1.1 kg/I. Nevertheless, it is also possible to provide fresh drilling fluid already having a comparatively higher density.
  • Drilling fluids with a density higher than that conventionally used for horizontal drilling are known, for example, in drilling for an artesian well or in case of drilling for oil or gas with an increased reservoir pressure.
  • the density of the debris laden drilling fluid is higher than that of the fresh drilling fluid due to the inclusion of debris generated at the working face of the drilling head during operation (unless the debris would have a density lower than that of the drilling fluid).
  • the elements of the drillpipe module that are due to transfer axial force have a compressive strength of 50 MPa or more, averaged over the total cross section.
  • the ratio of between the absolute value of the effective weight force per meter of the drillpipe in operation (i.e. with fresh drilling fluid in the passage and immersed in debris laden drilling fluid) and the transferrable axial force is ⁇ 0.0002 1/m.
  • the first and second connection unit are arranged such that, when the drillpipe module is connected with another drillpipe module, the axial force transferrable by the elements of the drillpipe that are due to transfer axial force at each point along the length of the drillpipe module, except a shoulder portion of the connection units having a higher strength, does not vary by more than 20 %, preferably by no more than 5%.
  • connection units - due to their design in defining the front and back enclosure of the buoyancy unit - will typically have a geometrical moment of inertia higher than the average moment of other portions along the length of the module.
  • the pipe is an inner pipe and encloses the passage
  • the drillpipe module further includes an outer pipe fixed to the first and second connection unit, wherein the buoyancy unit is provided in the space between the outer pipe and the inner pipe, wherein the buoyancy unit is preferably formed by gaseous material
  • the pipe encloses the passage and the buoyancy unit at least partially encloses the pipe, wherein the buoyancy unit is formed by solid material
  • the pipe encloses the buoyancy unit formed by solid material
  • the buoyancy unit encloses the buoyancy unit formed by solid material
  • the buoyancy unit encloses the passage
  • the buoyancy unit is formed by solid material and includes a first unit and a second unit, wherein the first unit encloses the passage and the second unit encloses the pipe, which encloses the first unit.
  • Such combinations of pipe and buoyancy unit allow for a high pressure inside the passage and a high pressure outside the drillpipe, wherein the (in comparison to just the inner pipe) increased cross sectional area provides a large area for receiving forwardly directed (axial) push force and the geometrical moment of inertia provides resistance against folding or buckling.
  • the arrangement where there is a further (outer) pipe, which, in turn, surrounds the buoyancy unit, is particularly beneficial insofar as it allows for the buoyancy unit being made of a material (e.g. polyurethane foam or another material like polyethylene with gas or air bubbles therein) which by itself may not be able to withstand the conditions inside the borehole, e.g. due to abrasion at the walls of the borehole or due to pressure of the debris laden drilling fluid return from the working face.
  • the outer pipe may have a smaller wall thickness, so just to withstand the pressure from the outside.
  • the arrangement of an inner pipe and an outer pipe also allows that the buoyancy unit is formed by gas enclosed between the pipes.
  • buoyancy unit It is also possible, provided suitable (a) material(s) for the buoyancy unit are used, that the drilling fluid is provided inside the buoyancy unit, which is enclosed by the pipe, wherein the pipe may also be sandwiched between two portions of the buoyancy unit.
  • one or more stiffeners are provided between the inner pipe and the outer pipe, wherein the one or more stiffeners preferably extend along the whole length of the buoyancy unit and in radial direction from the inner pipe to the outer pipe.
  • the stiffeners With the stiffeners extending along the whole length of the buoyancy unit, the stiffeners by themselves may contribute to the transfer of axial force. However, independently from receiving and transferring any axial force, the stiffeners contribute to the buckling or folding resistance of the drillpipe module in linking the inner and the outer pipe against a radial deforming of either pipe. In addition, the stiffeners provide further strengthening of the outer pipe in terms of hoop stress or collapse resistance, i.e. assist in preventing that the outer pipe collapses under the pressure of the debris laden drilling fluid.
  • the stiffeners and the inner and outer pipe are not necessarily made of the same material (or material class).
  • the inner and outer pipe may be made of steel, as with conventional drillpipes, while the stiffeners may be made of, for example, fiber-reinforced plastic. It is, however, also possible to provide other mixes of materials, including, for example, an inner pipe made of steel, stiffeners made of steel or aluminum and an outer pipe made of fiber reinforced plastic, possibly provided with a further coating.
  • At least one of the one or more stiffeners is arranged to fix the inner pipe and the outer pipe together and/or the outer pipe is releasably fixed to the connection units.
  • a fixing of the inner and outer pipe by means of the stiffeners allows for a further improvement in terms of stability, as such fixing not only prevents, for example, a radial deforming of the outer pipe in the direction to the inner pipe but also a deforming in the opposite direction.
  • the outer pipe only abuts the stiffeners and is furthermore connected to the connection units is a releasable manner, so that the outer pipe may be removed and replaced easily in order to address wear and tear.
  • connection units are arranged for allowing a releasable connection with the other drillpipe module, wherein the releasable connection is preferably a screwed connection, wherein the connection units most preferably include a pin connection unit and a box connection unit.
  • connection between drillpipe modules of the present invention is comparable or even compatible with connections conventionally used for, for example, HDD arrangements.
  • a particularly preferred example of such embodiment includes that there are provided an API box connection and/or an API pin connection, while also other connections may be provided, preferably including trapezoidal threading and a sealing shoulder.
  • the pin connection unit includes a projection portion provided with a sleeve arranged for being attached over the projection portion.
  • modules it is known from conventional drilling, that such module may be damaged, e.g. during handling in the course of assembling the drillpipe modules or of disassembling, wherein, in particular, a damage to the ends of the module are of concern where adjacent modules are linked.
  • a damage to the ends of the module are of concern where adjacent modules are linked.
  • variations of the respective length of a drillpipe module of a series of drillpipe modules are of no concern, rather than discarding a damaged module, the damaged end may be cut off, while a new connection is provided, e.g. by cutting a fresh thread in case of threaded connections. This may be done rather easily if at least one of the connection units projects from the buoyancy unit.
  • the sleeve may be provided so to provide a rather smooth and flush outer surface of the connection area.
  • the sleeve if needed, may also be cut accordingly for fitting.
  • a preferred variation of such sleeve includes two halves, which are fit on the connection area and fixed together along secants of the cross section, e.g. by bolts.
  • the pump provided for pumping the drilling fluid through the drillpipe may be a centrifugal pump and/or is preferably arranged to pump drilling fluid with a solids content of 5% or more.
  • the drilling fluid provided to the drilling head does not necessarily has to be freshly composed drilling fluid, as it is indeed possible to recycle the debris laden drilling fluid by at least partially removing debris therefrom.
  • fresh drilling fluid this is to be understood as being in contrast to the debris laden drilling fluid returning from the working face.
  • the drilling head or some other suitable element of the arrangement inside the borehole may be provided with steering elements, wherein furthermore the drilling head is preferably provided with a position, orientation and/or attitude detecting element.
  • a preferable implementation of the invention includes the provision of a motor for driving the drilling head, arranged between the drillpipe and the drilling head, wherein most preferably the motor is a mud motor driven, in turn, by the drilling fluid.
  • a transmission may be provided between the mud motor and the drilling head.
  • any additional equipment e.g. a sensor or the like in the area of the drilling head may be provided with batteries or the like as power sources
  • power may be derived from the mud motor or by other means from the flow of the drilling fluid and/or power is provided from above ground by means of, for example, wiring provided inside or along the drillpipe.
  • the drilling method includes adjusting a density of the drilling fluid provided through the passage, adjusting a pump rate of the drilling fluid through the passage, and/or adjusting a rate of advancement of the drillpipe, so to control the density of the debris laden drilling fluid for adjusting the effective weight of the drillpipe.
  • a particular density (i.e. composition) of the drilling fluid provided to the drill head it may be sufficient in certain cases to just set a particular density (i.e. composition) of the drilling fluid provided to the drill head, to provide for a certain advancing of the drilling and to provide for a certain pump rate of the drilling fluid. Controlling of these parameters, which influence the density of the debris laden drilling fluid, however, allows for adjusting in view of different drilling conditions. If, for example, due to the situation at the working face, the rate of advancement needs to be reduced, so that there is less debris in the returning drilling fluid, the density of the provided drilling fluid may be increased for compensation. Depending on the ground, the composition (and thus the density) of the debris at the working face may also change, which might similarly be addressed by appropriately controlling the density of the drilling fluid, the pump rate and/or the rate of advancement.
  • the method may also comprises detecting the density of the debris laden drilling fluid at the drill head and/or above ground, wherein the detected density is used in controlling the density. Measuring, sensing or detecting the density of the debris laden drilling fluid and modifying the control of the density of the (fresh) drilling fluid, the pump rate and/or the rate of advancement allows for a feedback control or regulation loop, while, however, the density of the debris laden drilling fluid and the ratio thereof in comparison to the density of the drillpipe may also be inferred otherwise. For example, the amount of friction between the drillpipe and the borehole may also be used, derived from the force needed for advancing and possibly from knowledge about the ground, as a basis for controlling the parameters influencing the uplift or downlift of the drillpipe in the borehole.
  • the method for drilling preferably further includes a steering of the drill head (indirectly via the drillpipe and/or directly) during the drilling. It is particularly preferred that the steering is based on positional information obtained in situ, e.g. by means of a sensor or probe attached to the drill head providing position information of the drill head or allowing a detection of the drill head's position from above surface.
  • the positional information may preferably be supplemented with information on the attitude and/or orientation of the drill head. Conventional approaches on steering and determination of the position and the like may be used in the context of the invention, as appreciated by the skilled person.
  • the present invention allows for, depending on the particular embodiment, advancing the drillpipe by pushing the drillpipe (with the drill head being driven independently from the drillpipe) or by rotating or turning the drillpipe itself so to turn the drill head. This might be combined with the steering.
  • the drillpipe may be pressed at its end above the surface in a known way.
  • a drill motor or mud motor included in the overall drilling arrangement (specifically between the drillpipe and the drill head)
  • the drillpipe may be pressed at its end above the surface in a known way.
  • the pre-assembly is, of course, only possible if there is sufficient space, while the benefit lies in the reduced amount of time needed for inserting the numerous drillpipe modules directly at the entrance of the borehole.
  • Fig. 1 shows a schematic representation for illustrating a first exemplary embodiment of the present invention.
  • a pump 10 and a drill rig 12 which are coupled to a drillpipe 16, which extends inside a borehole in ground 14.
  • a mud motor 18 is provided, which is coupled to a transmission 20, which in turn is coupled to a drilling head 22.
  • the drilling head 22 includes a drive 24, which drives the drilling bit 26 at the working face of the borehole.
  • fresh drilling fluid 28 is provided through the drillpipe 16 to the mud motor 18 and further to the drilling bit 26, where the drilling fluid takes up debris from the drilling operation and returns in the space between the drillpipe 16 and the walls of the borehole as debris laden drilling fluid 30.
  • the illustrated path of the drilling fluid 28 is to be understood as schematically.
  • the drillpipe 16 is formed by buoyancy enhanced drillpipe modules, which includes a pipe 32 and a buoyancy unit 34, wherein the buoyancy body has a lower density than the debris laden drilling fluid 30 and the dimensions of the buoyancy body 34 and the passage inside the pipe 32 in which the fresh drilling fluid 28 flows are set such that a density ratio between a combined density of the drillpipe 16 including the fresh drilling fluid 28 and a density of the debris laden drilling fluid 30 is such that, the effective weight of the drillpipe is thus reduced significantly.
  • Fig. 1 In the schematic overall illustration provided by Fig. 1 , the details of the drillpipe modules including the arrangement of the connection units thereof and not shown and reference is made insofar to Fig. 2 to 7 .
  • Fig. 2 shows a schematic representation of a buoyancy enhanced drillpipe module 40 according to an embodiment of the invention.
  • Fig. 2a shows a partial view of the drillpipe module
  • Fig. 2b shows a view of the left face of the drillpipe module shown in Fig 2a)
  • Fig. 2c shows cross sectional views at corresponding positions.
  • the drillpipe module 40 is immersed in debris laden drilling fluid 30 and includes a passage 46 in which fresh drilling fluid 28 is provided.
  • the drillpipe module 40 comprises an inner pipe 41 made of steel, which is surrounded by an outer pipe 41' also made of steel. At their ends (only one which is shown in Fig. 2 ) the pipes 41, 41' are connected to a respective connection unit. In the case of Fig. 2 , the connection unit is formed by a steel shoulder 45 together with a connection portion of the inner pipe 41.
  • the inner pipe 41 in its form, corresponds to a conventional drillpipe module having API box and pin connections.
  • the inner pipe 41, the steel shoulder 45 and the outer pipe 41' enclose and define a hollow portion filled with air, which forms the buoyancy unit 42 of the drillpipe module 40.
  • the area between the inner pipe 41 and the outer pipe 41' is provided with stiffeners or stabilizers 48, which extend radially from the inner pipe 41 to the outer pipe 41', adding to the stability and strength of the combination of inner and outer pipe 41, 41'.
  • the inner pipe has a diameter of 110 mm and a wall thickness of 12.5 mm, while the outer pipe is provided with a diameter of 324 mm and a wall thickness of 5 mm.
  • stiffeners having a length (in radial direction) of 101.5 mm and a thickness of 5 mm.
  • Fig. 3 shows a schematic representation of a buoyancy enhanced drillpipe module 50 according to another embodiment of the invention.
  • the module 50 includes a steel pipe 51 and a buoyancy unit 52 made of high density polyethylene (having a density of 0.985 kg/I), wherein the HPDE surrounds the steel pipe 51 and is fixed thereto.
  • the dimensions of the steel pipe 51 (which forms a passage 56) and the buoyancy unit 52 are set such that, with drilling fluid (not shown) flowing inside the passage 56 and debris laden drilling fluid outside the drillpipe module 50, the effective weight of the module 50 is basically compensated by the buoyancy of the module 50 in the drilling fluid.
  • the module 50 is furthermore provided, at each end thereof, with a steel shoulder 55, which serves as protection and break-out area for an API pin connection 53 and an API box connection 54 provided with the steel pipe 51, which allow combination of the module 50 with other such modules.
  • a typical length of such module 50 is about 10 m.
  • connection units 53, 54 of the steel pipe 51 form the connection units, wherein these connection units have the buoyancy unit 52 provided therebetween.
  • Fig. 4 shows a schematic representation of buoyancy enhanced drillpipe modules 60 according to another embodiment of the invention.
  • the buoyancy enhanced drillpipe modules 60 include a steel pipe 61 and a buoyancy unit 62, wherein the steel pipe 61 is provided with API pin and box connections 63, 64 and defines a passage 66 for drilling fluid.
  • connection 63, 64 extend beyond a shoulder form by or in the respective connection unit, while the modules 60 are provided with a sleeve 67.
  • the sleeve 67 is provided in the form of two halves, which are bolted in place in the recess formed between the shoulders of the neighboring modules 60.
  • connection unit may be formed by combining (e.g. welding together) a conventional (and standardized) drillpipe of comparative small diameter with a flange of larger diameter.
  • Figs. 5 to 7 show schematic representations of buoyancy enhanced drillpipe modules 70, 80, 90 according to further embodiments of the invention.
  • the buoyancy enhanced drillpipe modules 70, 80, 90 each include a steel pipe 71, 81, 91 and a buoyancy unit 72, 82, 92, wherein there is also provided a passage 76, 86, 96 for drilling fluid.
  • the steel pipe 71 also projects beyond the buoyancy unit 72, while here the pipe 71 is provided, at each end respectively, with a pin connection 73 and a box connection 74 (including, as illustrated, trapezoid threads and sealing shoulders), which form the connection units between which the buoyancy unit 72 is provided.
  • the buoyancy unit 72 surrounds the pipe 71.
  • a further pipe 81' which surrounds the buoyancy unit 82 and partially the connection units 83, 84.
  • buoyancy body 82 is the form of a plastic or foam material
  • gas e.g. air
  • evacuating the compartment e.g. providing a reduced pressure therein
  • the resulting gain in weight reduction is insignificant.
  • the provision of gas instead of a solid material allows for a reduced overall weight.
  • Fig. 7 shows an embodiment where the buoyancy unit 92 is provided inside the pipe 91, i.e. the relative positions are exchanged in comparison to the embodiment shown in Fig. 6 .
  • Fig. 8 shows a schematic representation of a system 1 for drilling a borehole in ground according to an embodiment of the invention.
  • the pump 10, the drill rig 12, the drillpipe 16 (made of drillpipe modules as discussed above), the mud motor 18, the transmission 20 and the drilling head 22 discussed above with reference to Fig. 1 are part of the system 1, wherein the pump 10 and the drill rig 12 are part of an operation unit 37, which further includes a drilling fluid conditioning and recycling unit 38.
  • the drilling head 22 is additionally provided with a density sensor 35 for detecting the density of the debris laden drilling fluid returning to the surface from the working face.
  • the system furthermore includes a control unit 36.
  • the control unit 36 receives data from the density sensor 35 and uses this data for determining whether the rate of advancement of the drillpipe 16 or the composition (and thus density) of the drilling fluid provided to the drillpipe 16 are to be changed in order to provide for a desired ratio between the density of the debris laden drilling fluid and the drillpipe (including fresh drilling fluid).
  • the drill rig 12 and/or the drilling fluid conditioning and recycling unit 38 are controlled by the control unit 36.
  • Fig. 9 shows a schematic flow diagram of an exemplary embodiment of a method for drilling a borehole in ground according to the invention.
  • a system as illustrated in Fig. 8 including in particular a buoyancy enhanced drillpipe made of a plurality of drillpipe module as discussed above and a drilling head.
  • drilling fluid is used, which - when laden with debris and returning from the working face - in operation immerses the drillpipe.
  • the buoyancy unit has a lower density than the drilling fluid and the dimensions of the buoyancy unit and the passage are set such that the overall drillpipe module is dimensioned such a ratio between an absolute value of an effective weight force per meter of the drillpipe module in debris laden drilling fluid, with drilling fluid in the passage, and a total cross section of those elements of the drillpipe module that are due to transfer axial force is ⁇ 10,000 N/m 3 .
  • the drillpipe is advanced upon pushing and/or turning the drilling head.
  • the rate of advancement or drilling is controlled in a control step 103 and, in an adjustment step 104, the density of the fresh drilling fluid is adjusted.
  • a further detecting step 105 the density of the debris laden drilling fluid is detected, wherein this data is then used in the control step 103 and/or the adjustment step 104.

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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)
EP17780629.6A 2016-09-12 2017-09-12 Extended directional drilling Active EP3510233B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016217313 2016-09-12
PCT/EP2017/072883 WO2018046757A2 (en) 2016-09-12 2017-09-12 Extended directional drilling

Publications (2)

Publication Number Publication Date
EP3510233A2 EP3510233A2 (en) 2019-07-17
EP3510233B1 true EP3510233B1 (en) 2022-03-16

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Application Number Title Priority Date Filing Date
EP17780629.6A Active EP3510233B1 (en) 2016-09-12 2017-09-12 Extended directional drilling

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EP (1) EP3510233B1 (da)
DK (1) DK3510233T3 (da)
WO (1) WO2018046757A2 (da)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2163465A (en) * 1984-08-21 1986-02-26 Timothy John Godfrey Francis Drill rod for drilling boreholes
WO1986004950A1 (en) * 1985-02-21 1986-08-28 A/S Raufoss Ammunisjonsfabrikker Drilling pipe for making a drill string
US4949797A (en) * 1989-08-24 1990-08-21 Isom John R Drill pipe
US6443244B1 (en) * 2000-06-30 2002-09-03 Marathon Oil Company Buoyant drill pipe, drilling method and drilling system for subterranean wells
US7228918B2 (en) * 2003-05-05 2007-06-12 Baker Hughes Incorporated System and method for forming an underground bore
US20120031616A1 (en) * 2010-08-03 2012-02-09 Hall David R Cylindrical Truss Structure Reinforced Pipe
DE112012002117T5 (de) 2011-05-16 2014-03-20 Gebr. Van Leeuwen Boringen B.V. Rohrführungseinrichtung, Rohrschieber, Rollenbock und Verfahren zum Verlegen eines Rohres in einem Untergrund
DE102014009630A1 (de) 2014-06-27 2015-12-31 Rüdiger Kögler Verfahren und Vorrichtung zur Erstellung eines Bohrlochs
US9719329B2 (en) * 2014-09-19 2017-08-01 Impact Selector International, Llc Downhole tool string buoyancy apparatus

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Publication number Publication date
EP3510233A2 (en) 2019-07-17
DK3510233T3 (da) 2022-04-11
WO2018046757A3 (en) 2018-04-19
WO2018046757A2 (en) 2018-03-15

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