CN102791952B - Boring method and AJD assembly - Google Patents
Boring method and AJD assembly Download PDFInfo
- Publication number
- CN102791952B CN102791952B CN201080058368.3A CN201080058368A CN102791952B CN 102791952 B CN102791952 B CN 102791952B CN 201080058368 A CN201080058368 A CN 201080058368A CN 102791952 B CN102791952 B CN 102791952B
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- China
- Prior art keywords
- magnetic
- abrasive
- particle
- injection nozzle
- fluid
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
- B24C1/045—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass for cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
- B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/002—Down-hole drilling fluid separation systems
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
Abstract
The invention discloses a kind of method pierced in target, the method comprises: be arranged on by drill string (1) in the well (2) of described target, this drill string comprises abrasive jet bit (16), this abrasive jet bit comprises injection nozzle (18), and this drill string is that fluid provides the passage (20) leading to injection nozzle from target surface; The fluid mixture comprising magnetic-particle to be sprayed into from injection nozzle towards abrasive jet bit supply and by abradant jet (19) via drill string described target is impacted; The injection concentration of the abrasive grain in adjustment (14) abradant jet; The magnetic field at collection surface (114) place arranged along the fluid flow path towards injection nozzle is adjusted between the first value and second are worth, when described first value, magnetic-particle is collected in from fluid mixture and collects surface, and magnetic-particle is discharged into fluid mixture from collection surface when described second value.
Description
Technical field
The present invention relates to and a kind ofly get into the boring method in target and relate to a kind of AJD assembly.This target can particularly soil layer.
Background technology
A kind of AJD system and method forming hole is in the target disclosed in WO-A-2005/005767.The system of described prior art comprises excavating tools, and be called as abrasive jet bit at this this excavating tools, this abrasive jet bit is arranged on the bottom of drill string, and this drill string is inserted into the hole of sub-surface earth layer from ground.This drill string is provided with the vertical passage for the drilling fluid mixture comprising abrasive grain being transported to drill bit.This drill bit comprises injection apparatus, and this injection apparatus is arranged as and produces abradant jet to impact the soil layer in shock zone on injection direction.This abradant jet comprises abrasive magnetic particles (shot).Arrange recirculating system, this recirculating system, after carrying out erosion by means of magnet and impacting, obtains abrasive grain from turning back to returning stream of ground, and this abrasive grain and the mixture received via drill string is again mixed mixing place.This magnet arrangements becomes rotatable conveyer, thus attracts the particle that will again circulate and mix place by transferring them to from the new fluid on ground.Conveyor assembly has the magnet arrangement arranged spirally and form highfield band and downfield band.Magnetic-particle is attracted to stayed surface by two kinds of magnetic field bands, and is re-arranged to highfield band.Distance between magnet arrangement and stayed surface reduces along import to the direction of mixing chamber, and therefore the magnetic field at stayed surface place increases due to highfield band and downfield band.During the rotation of conveyor assembly, particle is sent to mixing chamber from import along stayed surface, and in mixing chamber, particle is carried secretly by catadromous drilling fluid.In can arrange for adjusting a recirculation rate adjusting device of accessory drive form for conveyer, and by this way, the amounts of particles in the abradant jet at adjustment injection apparatus place.When abradant jet moves along the track in hole, especially during rotational motion, can change along the erosion amount in each shock zone of this track and realize oriented control.About this point also see WO2005/05766.
In the another kind of AJD system and method described in WO-A-2008/119821, arrange recirculating system device, this recirculating system device can operate when magnet does not have shift action.More usefully do not make movable part or at least discontinuous movable part at downhole operations, this static magnet can not adjust the recirculation rate of abrasive grain.
Summary of the invention
Need a kind of AJD assembly and boring method of improvement, wherein when being provided with the moving-member of minimum or not being provided with moving-member, the adjustment to the abrasive particulate concentration in abradant jet can be carried out.
According to the present invention, provide a kind of boring method got in target, the method comprises:
-drill string is arranged in the well of target, this drill string comprises abrasive jet bit in its lower end, and this drill bit comprises injection nozzle, and this drill string provides the passage from target surface to injection nozzle for fluid;
-by comprise magnetic-particle fluid mixture via drill string towards abrasive jet bit supply, and from described injection nozzle ejection abradant jet, described abradant jet has the erosion dynamic impacting described target;
The injection concentration of magnetic-particle in-adjustment abradant jet;
Wherein, in adjustment abradant jet, the injection concentration of magnetic-particle comprises and adjusting between first value and the second value in described magnetic field the magnetic field of the collection surface arranged along the fluid flow path towards injection nozzle, when described first value, magnetic-particle is collected in from fluid mixture and collects surface, and magnetic-particle is discharged into fluid mixture from collection surface when described second value.
Magnetic field intensity is adjusted between high level and low value a kind of effective and first-class mode avoiding adjustment System to have moving-member is provided, when high level, particle attracted to collects surface, this collection surface is along the fluid with particle towards the access arrangements of injection nozzle, and at low value place, particle is from the release of collection surface.
Magnetic field adjusts by following manner: make magnet relative to collection apparent motion, and/or the drive current of adjustment electromagnet.Adjustment magnetic field can comprise the magnetic connector being used in magnetic connection magnet and described collection surface and move between link position and disconnected position.
For directional drilling operation preferably, granule density is controlled to adjust explicitly with the position of the shock zone on selected track.Especially, injection nozzle can be made to rotate, and the adjustment in magnetic field can control according to the rotation of injection nozzle.
In one embodiment, the supply concentration of abrasive grain in the fluid mixture received at the upstream side of abrasive jet bit is adjusted to adjust the injection concentration in abradant jet.It can be different for spraying concentration, especially average is higher, but still depend on supply concentration, if the circulating system of being provided with, this down-hole recirculating system arranges and is used for after injection nozzle is discharged, they being recycled to the mixing place with delivering fluids mixture at abrasive grain along passage, wherein supplies concentration and is suitably adapted in the upstream in mixing place.Alternately or additionally, for adjustment supply concentration, adjustment of the present invention may be used in recirculating system inside in principle.Preferably, when arranging down-hole recirculating system, this down-hole recirculating system is also not used in adjustment recirculation rate.
The present invention also provides a kind of AJD assembly, and described AJD assembly can be connected to the drill string sections of tubulose, and described AJD assembly comprises: the abrasive jet bit with injection nozzle;
Fluid for comprising magnetic abrasive leads to the fluid passage of injection nozzle;
And adjusting device, described adjusting device for adjusting the concentration of the abrasive magnetic particles flowed through during operation in the fluid of injection nozzle,
Described adjusting device comprises:
Collect surface;
Magnetic holding apparatus, described magnetic holding apparatus is used in collection applying magnetic field, surface, described magnetic holding apparatus comprises magnet arrangement and adjustment control device, described adjustment control device optionally changes between the first value and the second value for making the magnetic field of collection surface, when described first value, magnetic-particle is collected in and collects surface, and magnetic-particle discharges from collection surface when described second value.
Adjusting device can become one with abrasive jet bit, or but separate piece, the part such as DHA can be connected to drill string.
In one embodiment, AJD assembly also comprises control unit, and this control unit is used for controlling the granule density of abradant jet explicitly with the position of the shock zone of abrasive jet bit during operation.Preferably, when arranging down-hole recirculating system, this down-hole recirculating system is not suitable for adjusting recirculation rate, and/or this control device is not suitable for the recirculation rate controlling recirculating system.
Magnet arrangement can comprise at least one block of electromagnet, so preferably, the drive current for adjusting electromagnet arranged by this adjustment control device.Alternately or additionally, magnet arrangement can comprise at least one block permanent magnet, so preferably, at least one block permanent magnet can be mobile relative to collection surface.This moves can be such as that translation is moved and/or rotates movement.
Magnetic holding apparatus can comprise actuator, and this actuator is for changing magnet arrangement and collecting surperficial relative position.
Alternately or additionally, magnet arrangement also can comprise the magnetic connector of selectively movement.
Passage can be the circular passage with inner annular wall and annular wall at least in part, and collection surface is arranged on inner annular wall at least in part.Such as, magnet can be surrounded by inner annular wall, or magnet arrangement can by inner annular wall around.
Magnet arrangement can comprise at least two blocks of magnet, and described at least two blocks of magnet are along described passage, locate with different Angle Position relative to flow direction.
Magnet arrangement can be positioned on outside passage.
AJD assembly also can comprise down-hole recirculating system, this down-hole recirculating system is arranged for during operation, after injection nozzle is discharged, make abrasive grain be recycled to mixing place along described passage at abrasive grain, and wherein said collection surface is in the upstream in mixing place, along described channel arrangement.In a particular embodiment, adjusting device can be formed as a part for recirculating system.
But, by having from the upstream returning to the mixing place of stream of recirculating system, along the fluid passage layout adjusting device from ground to bit nozzle, that is, make adjusting device be not have effect in the backward channel in recirculating system at fluid passage place, this adjustment becomes existence independent of recirculating system and precise function.
Term top, top, upstream, well upper and lower part, below, downstream, down-hole etc. with reference to the drill string in the wellbore with abrasive jet bit, its middle and upper part or top than bottom or below more near ground; Upstream and downstream to be flowed downward by drill string relative to usual and flow upward to the drilling fluid on ground by the annular space that formed with well bore wall.
AJD assembly can be a part for well system, this well system comprises part or all of rod string (such as arriving at the whole drill string on ground), or comprises the legacy device (such as drill string component, the drilling rod connected, bottom hole assemblies, specific function annex (sub) (such as the annex of well logging during (MWD)), stabilizer etc.) of drill string.
Adjusting device can become one with abrasive jet bit (such as at an upper portion thereof or upstream end thereof, especially in the upstream in mixing place with the abrasive grain from recirculating system).But, also adjusting device may be arranged as and separate with abrasive jet bit, such as, as a part for the drill string above abrasive jet bit, such as in independently drill string component or annex.Suitably, not too large along the distance of drill string between adjusting device and injection nozzle, otherwise the adjustment to delivering fluids middle particle concentration partly or completely can be eliminated when delivering fluids arrives at abrasive jet bit place.Should know, delayed sometime between the upstream position in nozzle neutralizing canal can adjust.Suitably, this distance is 100m or less, preferred 50m or less, more preferably 20m or less, to make to be limited to well the supply concentration that abrasive jet bit place receives.This adjusting device can be arranged on the upstream of abrasive jet bit or the part as bottom hole assemblies just.
AJD assembly also can comprise measurement mechanism, and this measurement mechanism is for detecting the angular orientation of injection nozzle in well, and this adjustment control device can be arranged for controlling magnetic holding apparatus according to detected angular orientation.
In one embodiment, adjusting device to be positioned in drill string, lower part outlet joint or above and towards abrasive jet bit.When attached, the stream with adjusted abrasive grain supply concentration enters the upper inlet joint of drill bit.In one embodiment, adjusting device is contained in the lasso being arranged in drill string, and described lasso has the through admission passage of the part forming drill string passage.In one embodiment, this through admission passage comprises annular space, magnetic holding apparatus be positioned at by the penetralia wall of this annular space around region.In one embodiment, adjusting device comprises the magnet at least two pieces of opposite sides being positioned at through admission passage.In one embodiment, described magnet comprises at least one block permanent magnet, and arranges the actuating device comprising shifter, and described shifter performs the displacement of permanent magnet relative to through admission passage.In one embodiment, described magnet is to install in the rotating mode between the position of through admission passage and the position relative to the inclination of this through admission passage that is parallel to.In one embodiment, adjusting device is provided with paramagnetism collector, and shifter is arranged between described magnet and collector, form magnetic contact respectively and disconnect magnetic contact.
In one embodiment of the invention, the method for operating AJD assembly comprises the following steps: obtain the flowing mixture comprising drilling fluid and abrasive grain; And change the operation of active device to obtain controlled attraction and/or the release of magnetic abrasive particles.Especially, adjusting device is operated to keep the grain amount in through admission passage, makes adjusting device operate in the mode of pulsation subsequently, remains on the part of abrasive grain in through admission passage and an only part with release during each pulsation.In one embodiment, the method comprises the adjusting device of setting at least two series connection, activate described adjusting device so that a collection of abrasive grain of each maintenance, described adjusting device of stopping using obtains the time difference to arrive in the arrival time at injection nozzle place at described many batches of abrasive grains.
Accompanying drawing explanation
By way of example the present invention is described, in accompanying drawing now with reference to accompanying drawing:
Fig. 1 diagrammatically illustrates the AJD system had according to AJD assembly of the present invention;
Fig. 2 shows the first embodiment of adjusting device;
Fig. 3 A, 3B show the second embodiment of adjusting device;
Fig. 4 shows the 3rd embodiment of adjusting device;
Fig. 5 A, 5B show the 4th embodiment of adjusting device; And
Fig. 6 A, 6B show the 5th embodiment of adjusting device.
Detailed description of the invention
In the accompanying drawings, identical Reference numeral is for identifying same or analogous target.
As shown in fig. 1, the drill string 1 be included according to the AJD system of AJD assembly of the present invention in the well 2 of target is comprised.This target is here sub-surface earth layer 5, in particular for providing one for the formation of for the production of the well of well going out mineral hydrocarbon.This drill string 1 is connected to device of rotation driving (not shown, but represented by arrow 10) at ground 8 place, thereon end, and is connected to lasso 13 in another lower end, and this lasso comprises according to adjusting device 14 of the present invention.This lasso 13 also can be provided with controller unit, with the inside making this controller unit be positioned at hole.Alternately, this controller unit can be positioned at the position different from having abrasive jet bit in drill string, or can be positioned on ground 8 place.
In the lower end of lasso 13, the abrasive jet bit 16 with injection nozzle 18 is connected to lasso 13 or becomes one with lasso 13.This drill string 1 has the passage 20 for fluid, and this fluid passage is communicated with injection nozzle fluid with the passage 24 of abrasive jet bit 16 via the passage 22 of lasso 13.Nozzle 18 is oriented in central area obliquely, arrange prejudicially relative to the pivot center of drill bit 16 to make shock zone, in this case, make abradant jet rotate in hole and cause jet 19 and shock zone to move along substantially circular track in hole.Preferably, shock zone and the center of rotation of this bias are overlapping, with the erosion dynamic making the centre of this well also stand abradant jet.
Injection nozzle 18 is arranged in above optional foot 29, and tilts with the angle of slope relative to pivot center 15 °-30 ° relative to the longitudinal direction of this system, but can use other angles.Preferably, this angle of slope is about 21 °, and it for being optimum for the bottom by making whole instrument utilize abrasive material to corrode this well in the inner axial rotation of well.
In the present embodiment, abrasive jet bit also comprises the recirculating system for abrasive grain, this recirculating system totally represents with 30, it has import 32 and outlet 34, this import is communicated with annular space 33 fluid between abrasive jet bit 16 and well 2, and the mixing chamber 36 at mixing place 37 place being arranged in passage 24 is led in this outlet.
Optional foot is set to distance borehole bottom one distance, and suitably comprises for making drilling fluid and chip with the gap of upwards flowing via annular space 33.This abrasive jet bit 18 can be such as the head such as described in WO2008/113843, WO2008/113844.
In operation, this system can work as follows.The drilling fluid comprising abrasive grain (such as shot) carries out pumping from the surface (such as Earth Surface) of target by the vertical passage 20 of drill string 2 by suitable pump (not shown).Part or all of drilling fluid is directed into injection nozzle 18, produces abradant jet 19 at this injection nozzle place.Abradant jet is ejected with impinge upon earth strata.This stratum is etched in shock zone due to abradant jet 19 impinge upon earth strata 5, thus deepens well 2.
Meanwhile, this abradant jet is around pivot axis.Thus, this shock zone moves along circular trace in hole, can be etched to make this stratum at all azimuths place.By adjusting the erosion dynamic of abradant jet, the oriented control of height can be realized.
By keeping the erosion dynamic of abradant jet constant, stratum is corroded equably in all sides in hole, and thus this hole is directly dug.When adjusting erosion dynamic, when the supply concentration especially by adjustment abrasive grain adjusts erosion dynamic, orientation will not be caused with motion (such as by rotating) nonsynchronous adjustment of the shock zone of jet.Thus, by getting out straight hole section relative to rotating on asynchronous Adjustment principle.But the change of the formation characteristics aspect in the distortion of the rotation aspect of excavating tools or bore region or other reasons can uneven erosions in causing hole.Need by the correction of adjustment erosion dynamic travel direction to compensate this unintentional uneven erosion.The erosion dynamic of this abradant jet is also adjustable to just excavate bending hole wittingly.When abradant jet is directed to impact stratum in the region of the larger erosion of needs to perform adjustment in direction, the erosion dynamic of this abradant jet can be increased periodically, thus produce larger erosion ratio in this region.Alternately or combinedlyly, when abradant jet directed for impacting the stratum in the region of the less erosion of needs time, the erosion dynamic of this abradant jet can be reduced.
With higher concentration from injection nozzle 10 exhale in identical locality (spot) by making abrasive grain and obtain directionality effect when each rotation of drill string 2 with drill bit 16.Thus, this borehole bottom 39 is corroded unevenly, and this causes being advanced further of well 9 to be offset continuously by the longitudinal direction relative to well 1.
Adjustable has the stream of abrasive grain to obtain pulse effects.That is, when each whole circle of drill string 1 and drill bit 4 rotates, this jet can comprise a stage of the abrasive grain with higher concentration and have at least one stage of abrasive grain of low concentration.Also possibly, a higher concentration is only provided for each selected integer circle rotation.Other schemes of preferential attack can use when arranging more than one injection nozzle.When arranging more than one injection nozzle, they suitably provide the impact of asymmetric distribution in well.
The adjustment of concentration c represents that concentration depends on the time, c=c(t).1,2,3 until 10 or 20, or more circle rotate, this adjustment can have repetition period.The time range will considered for specific adjusted can be the duration that a circle of drill string or some (as 10,100 or more, 1000 or more) circle rotate.Under the longer time, this adjustment can be changed, or is even stopped in some period, to carry out drilling well along the desired trajectory that can comprise straight part.
Thus, preferably, this adjusting device comprises adjustment control device, and this adjustment control device is arranged for controlling this adjusting device, adjusts explicitly to make the position of the shock zone on the erosion dynamic of abradant jet and selected track.
In order to determine the position of shock zone, this system can be provided with position sensor (such as well logging during sensor), for providing the signal representing abradant jet position.In order to determine the current drilling direction through stratum, this system can be provided with orientation sensor (such as well logging during sensor), for provide represent formed in soil layer hole along the signal in direction.
This orientation sensor can be set to one or its form combined in following sensor: orientation sensor, and it provides indication device relative to the signal in the direction of reference vector; Position sensor, it provides the signal represented relative to one or more position coordinateses of reference point; Density of earth formations sensor, the information of the change of its stratigraphic type near a distance provides or formation component; Or any other sensor be applicable to.
More much smaller than the situation of the system removed based on mechanical rock based on the mechanical force on the well system of abradant jet.This has the following advantages: these sensors can be arranged very near excavating tools, thus make may comparatively early and the adjustment control device that communicated to by signal exactly.These sensors can such as be arranged in identical chamber with adjustment control device.
Alternately, abradant jet advances through the position on stratum and/or direction can be determined based on the parameter that can obtain on ground 8, and this parameter comprises moment of torsion on drill string 2 and the orientation of drill string 2 and the axial location of drill string 2 and speed.
Also can decide to change drilling direction or revise via the operator of the orientation system at ground place.When coming from the signal of DHLWD sensor, can adopt multi-user's pulse remote sensing system or other suitable data communication systems that data are sent to ground.Via similar data link, control signal can be sent to downhole control, and this downhole control triggers a series of control actions needed for directed drilling correction expected.
Propeller (not shown) be advantageously provided for by abrasive jet system by the bottom 39 being pressed in hole 2.In order to avoid the forfeiture of the bending and oriented control of the unnecessary wearing and tearing on abrasive jet bit 6, system, pressing force large unlike the power kept at bottom place required for this abrasive jet bit 16 too many time, acquisition best effects.Therefore, this pressing force is preferably only enough to offset the frictional force in the axial recoil strength of abradant jet and propeller and the frictional force between abrasive jet system and hole wall.Typically, this pressing force is aptly lower than 10kN.
Suitable abradant jet comprises mixture, and this mixture comprises the abrasive grain of fluid (such as drilling fluid) and a certain controlled concentration.The erosion dynamic of jet is relevant to the total output belonged in the abrasive grain that becomes entrained in mixture.This depend on abrasive grain mass flow and depend on abrasive grain speed square.
The erosion dynamic of abradant jet is adjusted by the mass flow of abrasive grain in adjustment abradant jet.This can realize advantageous by the concentration of the abrasive grain in adjustment mixture.When the quantity impacting the similar particles on region in the unit interval is larger, owing to will corrode more stratum, total erosion dynamic of this abradant jet will increase.In adjustment mixture, the concentration of abrasive grain does not affect the Mechanical Contact active force between well system and stratum.
The less change of the concentration of abrasive grain can be enough to realize orientation, such as adjustment period between be changed to 20wt%(percentage by weight between the Cmax of particle and Cmin) particle or less, 10wt% or less, 5wt% or less.When these particles have substantially the same size/weight and/or density, these accompanying drawings can equally with the vol%(percent by volume of abrasive grain) represent.
Still see Fig. 1, abrasive grain can be entrained in and return in stream by the drilling fluid of excavated hole, and this returns the annular space 33 flowed between such as passing hole 1 and well system (2,13,16) and advances.
The concentration of the abrasive grain on ground is turned back in order to reduce omnidistance transport, this well system (especially abrasive jet bit 16) can be provided with EGR (schematically showing with 30), this EGR be arranged to by from impinge upon earth strata downstream return the abrasive grain of stream at least partially again recycling turn back in abradant jet 10.The abrasive grain be recycled such as can mix mutually with the new stream containing the abrasive grain supplying concentration in mixing chamber, and new stream and recycling abrasive grain all enter in this mixing chamber to obtain the injection fluid mixture containing the abrasive grain spraying concentration.
This abrasive grain preferably includes or comprises magnetisable material, i.e. paramagnetic material or ferrimagnet (such as such as shot or steel sand).Also will be represented as " magnetic material " or " magnetic-particle " this this, although it does not need to have permanent magnetism.This recirculating system can to comprise coming in comfortable annular space 33 upwards flowing and via outlet 34, particle is sent to the suction magnetic particle of the drilling fluid of mixing chamber 36.Usually, suitable EGR such as has description in WO2002/034653, WO2005/005766, WO2008/119821, WO2008/113844.
According to the present invention, in the supply concentration of upstream (passage namely above mixing chamber 36 20,22, in 24a) the adjustment abrasive grain in mixing place 37.Thus, in jet 19, the injection concentration of abrasive grain is adjusted, and this injection concentration depends on supply concentration.
Therefore adjusting device 14 is arranged along the passage 20,22,24 of drill string, in the embodiment in figure 1, is arranged in the upper end of abrasive jet bit 16 or lucky upstream.
In the embodiment in figure 1, adjust in lasso 13, show several embodiments of lasso in figs. 2-6.
In the embodiment of fig. 2, lasso 13 has non-magnetic housing 111, and this lasso has the upper inlet 112 that passage 20 fluid for the upper part with drill string is communicated with, and has the lower part outlet 113 for being communicated with passage 24 fluid of abrasive jet bit.Through admission passage 22 extends between this import and outlet.Two are furnished with to electric supportive device: electromagnet 115,116 at through admission passage 22 side.Often pair of electromagnet 115,116 is located along the part of inclined orientation a little of this through admission passage 22.By the adjustment controllably activated or these electromagnet of stopping using realize the abrasive particulate concentration flowing through this through admission passage 22.This is by starting or stopping the electric current being supplied to electromagnet to realize.This electric current also can change and/or changes between different nonzero values more smoothly, but the latter is not too preferred, because need the constant power from power source to supply.
Thus, in the collection surface of passage 22 wall, magnetic field is adjusted between the first value and second are worth, when the first value, at least some magnetic-particle is collected in from fluid mixture collects surface, and when the second value, magnetic-particle is discharged into fluid mixture from collection surface.First value is the high value in magnetic field and the second value is the lower value in magnetic field.Should know, collecting particle on surface can along the movement of this surface under the effect of streaming flow, but compared with the period of lower or zero magnetic field intensity, within the period of higher magnetic field intensity, more particle is present in collection on the surface.Represent with 114 and only collect surface for one.Preferably, when magnetic field is in its first value, magnetic-particle is collected by surface-supported major part, preferably collected by surface-supported at least 25% region, more preferably collected by surface-supported at least 50% region, even more preferably collected by surface-supported at least 75% region (such as substantially whole region).Preferably, when magnetic field is in its second value, magnetic-particle is from surface-supported major part release, preferably from surface-supported at least 25% region release, more preferably from surface-supported at least 50% region release, even more preferably from surface-supported at least 75% region (such as substantially whole region) release.Preferably; when magnetic field is in the first value; do not have magnetic-particle or only very the magnetic-particle of fraction again carried secretly by the fluid flowed along stayed surface, so such as collect again being carried secretly during magnetic field is in its first value less than 25% of particle on a support surface.
In the embodiment shown in Fig. 3 A, B, permanent magnet 117,118 can be used as the magnetic holding apparatus of through admission passage 22 side.These magnet can swing around axis of oscillation 123, to obtain in Fig. 3 A and the diverse location shown in Fig. 3 B.In position in figure 3 a, magnet 117,118 by swing away from this through admission passage 22, can this means that major part or whole abrasive magnetic particles will pass through along passage 22.On the contrary, in position in figure 3b, magnet 117,118 swingable towards and the collection surface 114 at wall place against through admission passage 22, by this way, the magnetic field of collecting surface is higher, and part or all abrasive magnetic particles is collected in described surface.By such as changing between the position shown in Fig. 3 A, B by means of mechanical actuator (not shown), corrective action can be realized because stream presents the abrasive grain of variable concentrations.
The embodiment of Fig. 4 comprises electromagnet 119, and this electromagnet is connected to so-called paramagnetism collector 120, thus together form magnetic holding apparatus.In addition, case 121 linkage that holds battery or be connected with external power source and electronic control unit.Under the effect of control unit, this electromagnet is encouraged by battery/power source, thus the magnetic field at paramagnetism collector place becomes enough strong, collects on paramagnetism collector 20 to make abrasive magnetic particles.By changing the activation of this electromagnet, magnetic particle concentration in through admission passage 14 can be changed so that the adjustment needed for realizing.This paramagnetism collector can comprise the permanent magnet provided compared with low magnetic field intensity, and this magnetic field intensity is still not enough to by powder collection at surperficial 114 places of collection, thus in this case round collector 120.Therefore, be enough to be used in collecting in the magnetic field intensity of collecting the appropriateness increase that surface is provided by electromagnet 119.
Embodiment shown in Fig. 5 A and 5B comprises permanent magnet 119a, and this permanent magnet can be connected (Fig. 5 B) by means of magnetic connector 122 or disconnect (Fig. 5 A) with two paramagnetism collectors 120, thus together form magnetic holding apparatus.By changing disconnecting between state and connection status of connector 22, the concentration of abrasive grain in through admission passage 14 can be changed.
Embodiment shown in Fig. 6 A, 6B comprises permanent magnet 119a, and this permanent magnet can be connected to two paramagnetism collector 120 by means of connector 122, thus jointly forms magnetic holding apparatus.Region outside collector 120 or annular space 124 should be enough large to collect enough a large amount of abrasive grains, to change the concentration of the abrasive grain being supplied to drill bit in the single rotation of drill string significantly.Replace electromagnet 119a, the electromagnet (not shown) selectively encouraged can be used.
Replace the paramagnetism connector in mobile Fig. 5 and 6, electromagnet they self can move up and down, with paramagnetism collector connect/disconnect.Alternately or additionally, only in two shown paramagnetism collectors 120 can be arranged.Equally maybe advantageously, additional magnetic guide (not shown) is mounted to be parallel to this magnet, to form magnetic shortcut by opening connector.This will be avoided when connector is opened from the particle flow in the magnetic interference surrounding annular space of the openend of connector.
So, such as can realize adjustment by following manner: the electromagnet selectively encouraged, by permanent magnet towards or away from collect surface actual motion, by magnetic conductor to be repositioned between magnet and the wall of fluid passage and/or by producing (or removal) magnetic shortcut at one or more magnet place.If possible, these magnet are preferably permanent magnet, and such as, rare-earth permanent magnet (as NdFeB or SmCo magnet), to avoid the current continuity when they have to be activated to be supplied to these magnet.
The advantage of the embodiment of Fig. 5 and 6 is: need an only room with electronic equipment; The fluid of the At The Height of paramagnetism collector is very large through region, it reduces the average speed of fluid around this device and particle; Only collector activation or stop using between switching need power, and be not activate (stopping using) itself need power.In the 5 embodiment of figure 5, magnetic holding apparatus is coaxial with housing.Be favourable for manufacture and for being connected to other (electronics) devices, these other devices are such as measuring transducer and electronic control unit.
The design of magnet, magnetic connector and collector and material should be mated with one another, do not waste to make magnetic flux and also magnetic field intensity outside collector enough large with the ferromagnetic particle temporarily collected along collector in stream.Collecting surface should be enough large, to collect enough a large amount of abrasive grains, thus can change the concentration arriving the particle of drill bit in a circle of drill string rotates significantly.
In one exemplary embodiment, the rotation of drill string can typically adopt 1 second.When using down-hole EGR, the granule density being pumped across drill string is typically in 0.1% to 4%(percent by volume) scope in (such as 0.4vol% to 2vol%), this is based on the shot consideration in aqueous fluid (such as water).So the every 100 liters of drilling fluids being pumped into drill bit per minute comprised up to 0.017litres/s(liter/second) abrasive material.Under 200 liters/min of rate of flow of fluids and in the adjustment of 1 second, typically need to collect 0.017 liter of particle during 0.5 second for the collector of 1vol% granule density and during another half second in discharged.
When using recirculating system, the drilling fluid in abradant jet can comprise injection concentration up to 10vol%(volume ratio proportion by subtraction), typically up to the abrasive magnetic particles of 5vol%, and average is higher than supply concentration.When there is no recirculating system, typically identical with injection concentration except there is possible change time lag by the supply concentration of drill string, and can such as be in 0.5vol% to 10vol% scope, such as 2-5vol%; Such as 3vol%.Recycling frequency such as can be between 10Hz to 40Hz.The rotation of this drill string, or the rotation of at least abrasive jet bit excavating tools can typically between 0.3Hz to 3Hz.
By not being adjust continuously but such as carry out only two circles or every three circle rotations in succession to increase the expectation bend radius of wellbore trace.
In order to obtain oriented control, by measure drill bit injection nozzle relative to desired drilling direction angular orientation and suitably trigger collection device activation and stop using.Down-hole battery pack or turbine generator or their combination such as can be come from for activating the power of (stopping using).In an example, shaft bottom structure, battery pack or turbine, control unit and memory and sensor cluster are such as arranged sequentially in adjusting device (Reference numeral 14 in Fig. 1) according to this and mix between place 37, or are all integrated in abrasive jet bit or are integrated in several parts connected.But, also may not arrange recirculating system.
May expect to avoid discharging collected all particles simultaneously, that is, avoid peak value (spike).For this reason, can consider to use:
-adjusting device, this adjusting device comprises the more than one adjustment equipment be one another in series, and this adjusting device has down time, this down time can by select to make many batches of particles discharging arrive at injection nozzle place arrival time between life period poor; Such as, near drill bit collection surface can by first stop using and also may by first activation;
-bypass, the particle of the constant ratio that this bypass is guaranteed in stream arrives at AJD device;
-from collector pulsation ground release particles; By collector of only stopping using very simply, the particle discharged at the top place of collector will be collected again, and can discharge the particle of the number change of a little pulsation thus in very short time limit;
-design collector, with saturated after making its part in brew cycle (such as 1/4) duration, and to adjust the duration release particles of half cycles subsequently of circulation subsequently;
The combination of-above-mentioned option.
The amount of magnetic flux changes from selected magnet such as 119,119a to paramagnetism collector.By changing the contact area between magnetic connector and magnet or the contact area between connector and collector, adjustable arrives at the magnetic flux of collector, and then adjustment is by the quantity of the particle of collector collection.
Preferably, the tool-face (toolface) of drill bit and direction are measured near drill bit, and may need to measure geomagnetic field.In order to avoid the impact of magnet in adjuster in this measurement, preferably make adjuster from the distance of magnetic sensor typically at least 1m.In order to the orientation (namely the tool-face of abrasive jet bit) of the adjustment and MODELS DESIGN OF ABRASIVE JET MACHINING NOZZLE that make abrasive concentration matches, regulation time is had to the traveling time of compensating particles from adjuster to drill bit.When electromagnet is all in static in adjuster and abrasive material EGR, magnet is relative to relative position the bending and being rotated by assembly and change by assembly of magnetic sensor.These impacts are eliminated greatly by calibration.
It has been found that, particle along the measurement by disturbing them of magnetic field sensor, can consider activation collector after and before collector is full of abrasive grain, carry out magnetic-field measurement.Moreover, time lag (being the time lag advancing to magnetic sensor about particle from collector in this case) should be considered.
Relevance between granule density and drill string rotate is arranged by considering some parameters.First, the turned position of drill bit is most important.In addition, the velocity of rotation of drill bit plays an important role.Moreover, by measuring flow velocity or being used for the system of specific flow velocity by calibration, the traveling time of particle between their release time and the time of arriving at drill bit can be revised.
When in the drill string above adjusting device is contained in abrasive jet bit, the supply flow of the drilling fluid with adjusted granule density may be transmitted, to obtain certain erosion effect expected in shaft bottom.Thus, the adjustment of down-hole recirculation circuit must no longer be relied on.
In one embodiment, adjusting device is contained in the lasso being arranged in drill string, and described lasso has through admission passage, and adjusting device is arranged along this through admission passage.Described lasso can be positioned at specific desired locations place along drill string.But, the optimum of corrective action is obtained when lasso is arranged near drill bit.
Adjusting device can comprise active device and at least one block of magnet, and this active device is for affecting the magnetic field of the magnet be positioned at outside through admission passage position and through admission passage.By suitably changing magnetic field, magnetic abrasive particles is affected by obtaining the mode of concentration difference.Thus, drill bit is supplied to the stream of the abrasive grain along with the time with varied concentration, and abrasive grain must do not made in down-hole recycling.
Magnet and through admission passage can be arranged according to several possibility.Such as, this through admission passage can comprise annular space, in this case, magnet be positioned at by the most inwall of annular space around region in.According to another kind of possibility, this adjusting device comprises the magnet at least two pieces of opposite sides being positioned at through admission passage.
In order to obtain required adjustment, displaceable magnetic conductor between magnet and through admission passage may be applied to.This magnetic conductor affects the magnetic field that abrasive grain experiences, and this depends on the position of described conductor.Other possibility exists equally.Such as, magnet can comprise at least one block permanent magnet, and active device can comprise shifter.Described shifter is used for permanent magnet is shifted relative to through admission passage.The changes of magnetic field that magnet makes the abrasive grain of process in through admission passage experience relative to the actual motion of the wall of through admission passage, thus some particles are kept other particles then passes through.The different behaviors of abrasive grain in through admission passage cause the adjustment to drilling fluid middle particle concentration.
Can be used on the rotating mode between position and the obliquity relative to this through admission passage being parallel to through admission passage and magnet is installed.Other shift mechanism (such as slide block) is also possible.
According to another replacement scheme, lasso can be provided with paramagnetism collector, and in this case, shifter is operated for contacting with disconnecting with being formed between collector to contact at described magnet respectively.
In addition, this magnet can comprise electromagnet.By encouraging or stop using this electromagnet respectively, corrective action can be realized.
The invention still further relates to a kind of method for operating foregoing abrasive jet drilling, the method comprises the following steps: the operation changing active device, to obtain in check attraction and/or the release of magnetic abrasive particles.Thus, can produce many batches of abrasive grains in stream, this can provide pulse effects.
According to another kind of possibility, can comprise the following steps according to method of the present invention:
-operation adjustment device the particle of a tittle is remained in through admission passage,
-make adjusting device operate in a pulsing mode subsequently, so that release remains on the part of the abrasive grain in this through admission passage and an only part during each pulsation.
By fast pulsation, some particles will be released and again be attracted, and this depends on the duration of pulsation.Thus, each limited amount abrasive grain is freely, thus result in the many batches of abrasive grains that size can be precisely determined.
Alternately, can comprise the following steps according to method of the present invention:
-at least two adjusting devices of connecting are set,
-activate described adjusting device so that a collection of abrasive grain of each maintenance,
-described adjusting device of stopping using obtains the time difference to arrive in the arrival time at drill bit place at described many batches of abrasive grains.
For example, the adjusting device near drill bit first can be stopped using before another adjusting device is stopped using.
In addition, can comprise the following steps according to method of the present invention:
-measure the flow of flowing mixture or calibrate the well system being used for particular flow rate,
-by adjusting device, the traveling time of particle from its release time is revised, and the arrival time that particle arrives at drill bit is revised.
The downhole power systems be combined with the present invention can obtain power from pressurized drilling fluid stream.Only sub-fraction (being typically the less than 5%) hydraulic energy be present in the fluid cycling through hole needs to obtain.Thus, generator will be made ratio as down-hole turbine or positive displacement motor (PDM) much smaller, down-hole turbine or positive displacement motor object are to change most of utilisable energy for driving conventional drill.
The downhole power systems of the first type comprises such as by means of the generator that turbine or positive displacement motor (PDM) part are driven by stream.The electric energy produced can be supplied to electro-motor.This electro-motor 23 can be controlled by electronic control system.
More than one turbine/generator module can be installed in series to change required power.This orientation can improving downhole power systems is flexible because this modular method is by mechanical realization, with have similar rated power non-modularization turbine assembly compared with not too hard.
The downhole power systems of the alternative type of the second comprises the passive hydraulic motor (such as turbine or passive positive displacement motor (PDM) part) that can be driven by stream.Device for controlling the power on output shaft is set.This device can be set to the form of flow control apparatus (such as control valve), and described flow control apparatus is for controlling the flowing of the drilling fluid flowing through passive hydraulic motor.
Alternately, generator can be installed around output shaft and be used as controlled brake, and this controlled brake can electronics adjustment by the load in adjustment generator loop.This electronic regulated valve or load can be controlled by electronic control system.
Utilize abradant jet, the erosion dynamic of abradant jet can adjust via electronic control system.Electronic control system can be arranged as the signal of shock zone along the position of its track in borehole bottom that reception represents abradant jet, and then it can be used for the erosion dynamic adjusting abradant jet according to the position along track.Directly can receive this signal from the down well placement sensor be positioned near abrasive jet bit.Position sensor can suitably be received together with electronic control system.
This electronic control system can comprise electronic memory module, and this electronic memory module storage comprises the data of motor voltage, electric current, rotational frequency, temperature and other data.The selection of these data can be transferred to ground by via well logging during mwd system (when arranging well logging during mwd system).By male sex's make-up adapter work (malestabber), electronics is connected to electronic control system to this drill rod telemetry system.This electronic control system can be programmed, can keep or realize selected condition.Any electronic component can be arranged in normal pressure room or pressure equalizing chamber.
Claims (7)
1. pierce the method in target, described method comprises:
-drill string is arranged in the well of described target, described drill string comprises abrasive jet bit in its lower end, and described drill bit comprises injection nozzle, and described drill string provides the passage from the surface of described target to injection nozzle for fluid;
-fluid mixture comprising magnetic-particle is supplied towards abrasive jet bit via drill string, and from described injection nozzle ejection abradant jet, described abradant jet has the erosion dynamic impacting described target;
-shock zone of abradant jet is moved along the selected track in well; And
-the injection concentration of magnetic-particle in abradant jet is adjusted when mobile shock zone;
Wherein, in adjustment abradant jet, the injection concentration of magnetic-particle comprises and adjusting between first value and the second value in described magnetic field the magnetic field of the collection surface arranged along the fluid flow path towards injection nozzle, when described first value, magnetic-particle is collected in and collects surface from fluid mixture, and magnetic-particle is discharged into fluid mixture from collection surface when described second value;
It is characterized in that, magnetic field is adjusted by permanent magnet (119a), described permanent magnet disconnects by means of magnetic connector (122) with paramagnetism collector (120) or is connected, thus together form magnetic holding apparatus, making by changing disconnecting between state and connection status of magnetic connector (122), changing the concentration of abrasive grain in passage (14); And
Down-hole recirculating system is set, for being recycled to the mixing place with delivering fluids mixture along described passage at abrasive grain after injection nozzle is discharged, wherein in the upstream adjustment supply concentration in mixing place.
2. the method for claim 1, wherein control granule density to adjust granule density explicitly with the position of the shock zone on described selected track.
3. the method according to any one of claim 1-2, wherein, in adjustment fluid mixture, the supply concentration of abrasive grain is to adjust the injection concentration in abradant jet.
4. an AJD assembly, described AJD assembly can be connected to the drill string sections of tubulose, and described AJD assembly comprises: the abrasive jet bit with injection nozzle;
For comprising the fluid passage leading to injection nozzle of the fluid of magnetic abrasive;
And adjusting device, described adjusting device for adjusting the concentration of the abrasive magnetic particles flowed through during operation in the fluid of injection nozzle,
Described adjusting device comprises:
Collect surface;
Magnetic holding apparatus, described magnetic holding apparatus is used in collection applying magnetic field, surface, described magnetic holding apparatus comprises magnet arrangement and adjustment control device, described adjustment control device optionally changes between the first value and the second value for making the magnetic field of collection surface, when described first value, magnetic-particle is collected in and collects surface, and magnetic-particle discharges from collection surface when described second value;
It is characterized in that, magnetic field is adjusted by permanent magnet (119a), described permanent magnet disconnects by means of magnetic connector (122) with paramagnetism collector (120) or is connected, thus together form magnetic holding apparatus, making by changing disconnecting between state and connection status of magnetic connector (122), changing the concentration of abrasive grain in through admission passage (14); And
Described AJD assembly comprises down-hole recirculating system, for being recycled to the mixing place with delivering fluids mixture at abrasive grain along described fluid passage after injection nozzle is discharged, wherein in the upstream adjustment supply concentration in mixing place.
5. AJD assembly as claimed in claim 4, wherein, described fluid passage is the circular passage with inner annular wall and annular wall at least partly, and wherein said collection surface is arranged on described inner annular wall at least in part.
6. the AJD assembly according to any one of claim 4-5, wherein said magnet arrangement comprises at least two blocks of magnet (17,18), and described at least two blocks of magnet are positioned at different Angle Position place along described fluid passage, relative to flow direction.
7. the AJD assembly according to any one of claim 4-5, wherein, described collection surface is mixing the upstream in place, is arranging along described fluid passage.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP09180556 | 2009-12-23 | ||
| EP09180556.4 | 2009-12-23 | ||
| PCT/EP2010/070496 WO2011076851A1 (en) | 2009-12-23 | 2010-12-22 | Method of drilling and abrasive jet drilling assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102791952A CN102791952A (en) | 2012-11-21 |
| CN102791952B true CN102791952B (en) | 2016-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080058368.3A Expired - Fee Related CN102791952B (en) | 2009-12-23 | 2010-12-22 | Boring method and AJD assembly |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20120255791A1 (en) |
| EP (1) | EP2516786A1 (en) |
| CN (1) | CN102791952B (en) |
| AU (1) | AU2010334867B2 (en) |
| BR (1) | BR112012015445A2 (en) |
| CA (1) | CA2784992A1 (en) |
| WO (1) | WO2011076851A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2516788A1 (en) * | 2009-12-23 | 2012-10-31 | Shell Internationale Research Maatschappij B.V. | Method of drilling and jet drilling system |
| US20130292181A1 (en) * | 2010-12-22 | 2013-11-07 | Jan-Jette Blange | Directional drilling |
| CA2954720A1 (en) * | 2014-07-25 | 2016-01-28 | Shell Internationale Research Maatschappij B.V. | Method and system for transmitting information in a jet drilling system |
| US10492709B2 (en) | 2015-11-19 | 2019-12-03 | Verily Life Sciences Llc | Magnetic probes for in vivo capture and detection of extracellular vesicles |
| SG10201602833VA (en) * | 2016-04-11 | 2017-11-29 | Abrasive Eng Pte Ltd | Magnetic Valve for Shot Peening |
| CN108997986A (en) * | 2018-07-02 | 2018-12-14 | 中国石油大学(北京) | A kind of nanometer abrasive drilling fluid and boring method |
| CN109277951A (en) * | 2018-10-29 | 2019-01-29 | 信利光电股份有限公司 | A kind of method and apparatus preparing the ground glass cover board with fade effect |
| CN110468267B (en) * | 2019-10-09 | 2021-04-23 | 郑州大学 | Concentration-adjustable liquid-solid pre-mixed jet surface layer modification device |
| NL2024001B1 (en) | 2019-10-11 | 2021-06-17 | Stichting Canopus Intellectueel Eigendom | Method and system for directional drilling |
| CN114571374B (en) * | 2022-03-14 | 2023-03-17 | 陕西捷特智能科技有限公司 | Vortex magnetic guide jet flow based 3D complex part inner flow passage cleaning device and method |
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| EP0318471A1 (en) * | 1986-05-22 | 1989-05-31 | Flowmole Corporation | Pitch angle monitoring arrangement |
| CN1471489A (en) * | 2000-10-26 | 2004-01-28 | 国际壳牌研究有限公司 | Device for transforting particles of magnetic material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MY136183A (en) * | 2001-03-06 | 2008-08-29 | Shell Int Research | Jet cutting device with deflector |
| AR045021A1 (en) | 2003-07-09 | 2005-10-12 | Shell Int Research | DEVICE FOR THE TRANSPORTATION OF MAGNETIC PARTICLES AND THE TOOL THAT INCLUDES SUCH DEVICE |
| AR045022A1 (en) * | 2003-07-09 | 2005-10-12 | Shell Int Research | SYSTEM AND METHOD FOR PERFORATING AN OBJECT |
| DE602008004471D1 (en) | 2007-03-22 | 2011-02-24 | Shell Int Research | SPACER WITH SCREW-TYPE SLOTTED |
| DE602008004740D1 (en) | 2007-03-22 | 2011-03-10 | Shell Int Research | SPACER WITH BEAM HOLDER |
| AU2008234851B2 (en) | 2007-04-03 | 2011-05-19 | Shell Internationale Research Maatschappij B.V. | Method and assembly for abrasive jet drilling |
| EP2516788A1 (en) * | 2009-12-23 | 2012-10-31 | Shell Internationale Research Maatschappij B.V. | Method of drilling and jet drilling system |
-
2010
- 2010-12-22 WO PCT/EP2010/070496 patent/WO2011076851A1/en active Application Filing
- 2010-12-22 EP EP10792947A patent/EP2516786A1/en not_active Withdrawn
- 2010-12-22 CN CN201080058368.3A patent/CN102791952B/en not_active Expired - Fee Related
- 2010-12-22 CA CA2784992A patent/CA2784992A1/en not_active Abandoned
- 2010-12-22 US US13/517,445 patent/US20120255791A1/en not_active Abandoned
- 2010-12-22 BR BR112012015445A patent/BR112012015445A2/en not_active IP Right Cessation
- 2010-12-22 AU AU2010334867A patent/AU2010334867B2/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0318471A1 (en) * | 1986-05-22 | 1989-05-31 | Flowmole Corporation | Pitch angle monitoring arrangement |
| CN1471489A (en) * | 2000-10-26 | 2004-01-28 | 国际壳牌研究有限公司 | Device for transforting particles of magnetic material |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2010334867B2 (en) | 2015-10-01 |
| EP2516786A1 (en) | 2012-10-31 |
| BR112012015445A2 (en) | 2016-03-15 |
| US20120255791A1 (en) | 2012-10-11 |
| CN102791952A (en) | 2012-11-21 |
| AU2010334867A1 (en) | 2012-07-12 |
| WO2011076851A1 (en) | 2011-06-30 |
| CA2784992A1 (en) | 2011-06-30 |
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