WO2017079829A1 - Générateur d'impulsions de pression de fluide pour outil de télémétrie - Google Patents

Générateur d'impulsions de pression de fluide pour outil de télémétrie Download PDF

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Publication number
WO2017079829A1
WO2017079829A1 PCT/CA2016/051298 CA2016051298W WO2017079829A1 WO 2017079829 A1 WO2017079829 A1 WO 2017079829A1 CA 2016051298 W CA2016051298 W CA 2016051298W WO 2017079829 A1 WO2017079829 A1 WO 2017079829A1
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WO
WIPO (PCT)
Prior art keywords
uphole
downhole
rotor
side face
stator
Prior art date
Application number
PCT/CA2016/051298
Other languages
English (en)
Inventor
Gavin Gaw-Wae LEE
Aaron W. LOGAN
Original Assignee
Evolution Engineering Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Evolution Engineering Inc. filed Critical Evolution Engineering Inc.
Publication of WO2017079829A1 publication Critical patent/WO2017079829A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
    • E21B47/18—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry
    • E21B47/24—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry by positive mud pulses using a flow restricting valve within the drill pipe

Definitions

  • This disclosure relates generally to a fluid pressure pulse generator for a telemetry tool, such as a mud pulse telemetry measurement-while-drilling ("MWD”) tool.
  • a telemetry tool such as a mud pulse telemetry measurement-while-drilling ("MWD) tool.
  • MWD measurement-while-drilling
  • the recovery of hydrocarbons from subterranean zones relies on the process of drilling wellbores.
  • the process includes drilling equipment situated at surface, and a drill string extending from the surface equipment to a below-surface formation or subterranean zone of interest.
  • the terminal end of the drill string includes a drill bit for drilling (or extending) the wellbore.
  • the process also involves a drilling fluid system, which in most cases uses a drilling "mud" that is pumped through the inside of piping of the drill string to cool and lubricate the drill bit.
  • the mud exits the drill string via the drill bit and returns to surface carrying rock cuttings produced by the drilling operation.
  • the mud also helps control bottom hole pressure and prevent hydrocarbon influx from the formation into the wellbore, which can potentially cause a blow out at surface.
  • BHA bottom-hole-assembiy
  • LWD logging-while-drilling
  • MWD measurement-while-drilling
  • MWD equipment is used to provide downhole sensor and status information to surface while drilling in a near real-time mode. This information is used by a rig crew to make decisions about controlling and steering the well to optimize the drilling speed and trajectory based on numerous factors, including lease boundaries, existing wells, formation properties, and hydrocarbon size and location. The rig crew can make intentional deviations from the planned welibore path as necessary based on the information gathered from the downhole sensors during the drilling process. The ability to obtain real-time MWD data allows for a relatively more economical and more efficient drilling operation.
  • One type of downhoie MWD telemetry known as mud pulse telemetry involves creating pressure waves ("pulses") in the drill mud circulating through the drill string. Mud is circulated from surface to downhole using positive displacement pumps.
  • the resulting flow rate of mud is typically constant.
  • the pressure pulses are achieved by changing the flow area and/or path of the drilling fluid as it passes the MWD tool in a timed, coded sequence, thereby creating pressure differentials in the drilling fluid.
  • the pressure differentials or pulses may be either negative pulses or positive pulses.
  • Valves that open and close a bypass stream from inside the drill pipe to the welibore annulus create a negative pressure pulse. All negative pulsing valves need a high differential pressure below the valve to create a sufficient pressure drop when the valve is open, but this results in the negative valves being more prone to washing. With each actuation, the valve hits against the valve seat and needs to ensure it completely closes the bypass; the impact can lead to mechanical and abrasive wear and failure. Valves that use a controlled restriction within the circulating mud stream create a positive pressure pulse. Pulse frequency is typically governed by pulse generator motor speed changes. The pulse generator motor requires electrical connectivity with the other elements of the MWD probe.
  • valve mechanism used to create mud pulses is a rotor and stator combination where a rotor can be rotated relative to the fixed stator between an open flow position where there is no restriction of mud flowing through the valve and no pulse is generated, and a restricted flow position where there is restriction of mud flowing through the valve and a pressure pulse is generated.
  • a fluid pressure pulse generator apparatus for a telemetry tool comprising a stator and a rotor.
  • the stator comprises a stator body and a plurality of radially extending stator projections spaced around the stator body.
  • the stator projections have a radial profile with an uphole end and a downhoie end with a first side face and an opposed second side face extending between the uphole end and the downhoie end, whereby adjacently spaced stator projections define stator flow channels extending therebetween.
  • the rotor comprises a rotor body and a plurality of radially extending rotor projections spaced around the rotor body.
  • the rotor projections have a radial profile with an uphole end and a downhoie end with a first side face and an opposed second side face extending between the uphole end and the downhoie end.
  • the rotor projections are axially adjacent and rotatable relative to the stator projections between an open flow position where the rotor projections axially align with the stator projections and a restricted flow position where the rotor projections axially align with the stator flow channels to create fluid pressure pulses in fluid flowing through the stator flow channels.
  • the downhoie ends of the stator projections or the downhoie ends of the rotor projections comprise downhoie radial faces extending between a downhoie edge of the first side face and a downhoie end of the second side face, and respectively axially adjacent uphole ends of the rotor projections or uphole ends of the stator projections comprise uphole radial faces extending between an uphole edge of the first side face and an uphole edge of the second side face.
  • the uphole radial faces axially align with the downhoie radial faces when the rotor projections are in the open flow position.
  • At least one uphole radial face comprises a stopper portion which is uphole relative to at least a portion of the axiaSly aligned downhoie radial face and/or at least one downhoie radial face comprises a stopper portion which is downhoie relative to at least a portion of the axially aligned uphole radial face, such that the stopper portion limits the span of rotation of the rotor relative to the stator.
  • At least one uphole radial face may comprise the stopper portion with the uphole edge of the first side face uphole relative to the uphole edge of the second side face.
  • At least one downhole radial face may comprise the stopper portion with the downhole edge of the first side face downhole relative to the downhole edge of the second side face.
  • At least one of the uphole radial faces may be sloped from the uphole edge of the first side face to the uphole edge of the second side face with the uphole edge of the first side face uphole relative to the uphole edge of the second side face, and the axially aligned downhole radial face may be sloped from the downhole edge of the first side face to the downhole edge of the second side face with the downhole edge of the first side face uphole relative to the downhole edge of the second side face.
  • a portion of at least one of the uphole radial faces may be sloped and the uphole edge of the first side face may be uphole relative to the uphole edge of the second side face, and a portion of the axially aligned downhole radial face may be sloped and the downhole edge of the first side face may be uphole relative to the downhole edge of the second side face.
  • At least one of the uphole radial faces may have a stepped profile and the uphole edge of the first side face may be uphole relative to the uphole edge of the second side face, and the axially aligned downhole radial face may have a corresponding stepped profile and the downhole edge of the first side face may be uphole relative to the downhole edge of the second side face, There may be an axial gap between the at least one uphole radial face and the axially aligned downhole radial face when the rotor projections are in the restricted flow position.
  • the stator projections may be uphole relative to the rotor projections and the downhole ends of the stator projections may comprise the downhole radial faces and the uphole ends of the rotor projections may comprise the uphole radial faces.
  • the stator body may have a bore therethrough and at least a portion of the rotor body may be received within the bore.
  • the rotor body may have a bore therethrough and the apparatus may further comprises a rotor cap comprising a cap body and a cap shaft, the cap shaft may be received in the bore of the rotor body and configured to releasably couple the rotor body to a driveshaft of the telemetry tool.
  • a telemetry tool comprising a pulser assembly and a fiuid pressure pulse generator.
  • the pulser assembly comprises a housing enclosing a motor coupled with a driveshaft.
  • the fluid pressure pulse generator comprises a stator and a rotor.
  • the stator comprises a stator body and a plurality of radially extending stator projections spaced around the stator body.
  • the stator projections have a radial profile with an uphole end and a downhole end with a first side face and an opposed second side face extending between the uphole end and the downhole end, whereby adjacently spaced stator projections define stator fiow channels extending therebetween.
  • the rotor comprises a rotor body and a plurality of radially extending rotor projections spaced around the rotor body.
  • the rotor projections have a radial profile with an uphole end and a downhole end with a first side face and an opposed second side face extending between the u ho!e end and the downhole end, the rotor projections being axially adjacent the stator projections.
  • the driveshaft is coupled to the rotor and the motor rotates the driveshaft and rotor relative to the stator between an open flow position where the rotor projections axially align with the stator projections and a restricted flow position where the rotor projections axially align with the stator flow channels to create fiuid pressure pulses in fluid flowing through the stator flow channels.
  • the downhole ends of the stator projections or the downhole ends of the rotor projections comprise downhole radial faces extending between a downhole edge of the first side face and a downhole end of the second side face, and respectively axially adjacent uphole ends of the rotor projections or uphole ends of the stator projections comprise uphole radial faces extending between an uphole edge of the first side face and an uphole edge of the second side face.
  • the uphole radial faces axially align with the downhole radial faces when the rotor projections are in the open flow position.
  • At least one uphole radial face comprises a stopper portion which is uphoie relative to at least a portion of an axially aligned downhole radial face and/or at least one downhole radial face comprises a stopper portion which is downhole relative to at least a portion of an axially aligned uphole radial face, such that the stopper portion limits the span of rotation of the rotor relative to the stator.
  • At least one uphole radial face may comprise the stopper portion with the uphole edge of the first side face uphole relative to the uphoie edge of the second side face.
  • At least one downhole radial face may comprise the stopper portion with the downho!e edge of the first side face downhole relative to the downhole edge of the second side face.
  • At least one of the uphole radial faces may be sloped from the uphole edge of the first side face to the uphole edge of the second side face with the uphole edge of the first side face uphole relative to the uphole edge of the second side face, and the axially aligned downhole radial face may be sloped from the downhole edge of the first side face to the downhole edge of the second side face with the downhole edge of the first side face uphole relative to the downhole edge of the second side face.
  • a portion of at least one of the uphole radial faces may be sloped and the uphole edge of the first side face may be uphole relative to the uphole edge of the second side face, and a portion of the axially aligned downhole radial face may be sloped and the downhole edge of the first side face may be uphole relative to the downhole edge of the second side face.
  • At least one of the uphole radial faces may have a stepped profile and the uphole edge of the first side face may be uphole relative to the uphole edge of the second side face, and the axially aligned downhole radial face may have a corresponding stepped profile and the downhole edge of the first side face may be uphole relative to the downhoie edge of the second side face.
  • stator projections may be uphole relative to the rotor projections and the downhole ends of the stator projections may comprise the downhole radial faces and the uphole ends of the rotor projections may comprise the uphole radial faces.
  • the stator body may have a bore therethrough and at least a portion of the rotor body may be received within the bore.
  • the rotor body may have a bore therethrough and the fluid pressure pulse generator may further comprise a rotor cap comprising a cap body and a cap shaft, the cap shaft being received in the bore of the rotor body and configured to releasably couple the rotor body to the driveshaft.
  • Figure 1 is a schematic of a drill string in an oil and gas borehole comprising a
  • Figure 2 is a longitudinally sectioned view of a mud pulser section of the MWD tool that includes a pulser assembly, a fluid pressuremodule generator in accordance with a first embodiment, and a first embodiment of a flow bypass sleeve that surrounds the fluid pressure pulse generator.
  • Figure 3 is an exploded perspective view of the fluid pressure pufse generator of the first embodiment comprising a stator and a rotor.
  • Figure 4 is a perspective view of the fluid pressure pulse generator of the first embodiment with the rotor in an open flow position.
  • Figure 5 is a side view of the fluid pressure pulse generator of the first embodiment with the rotor in the open flow position.
  • Figure 6 is a perspective view of the fluid pressure pulse generator of the first embodiment with the rotor in a restricted flow position.
  • Figure 7 is a side view of the fluid pressure pulse generator of the first embodiment with the rotor in the restricted flow position.
  • Figure 8 is a perspective view of a fluid pressure pulse generator according to a second embodiment comprising a stator and a rotor with the rotor in an open flow position.
  • Figure 9 is a perspective view of the fluid pressure pu!se generator of the second embodiment with the rotor in a restricted flow position.
  • Figure 0 is a perspective view of a fluid pressure pulse generator according to a third embodiment comprising a stator and a rotor with the rotor in an open flow position.
  • Figure 1 1 is a perspective view of the fluid pressure pulse generator of the third embodiment with the rotor in a restricted flow position.
  • Figure 12 is a perspective view of the flow bypass sleeve of the first embodiment.
  • Figure 13 is a perspective view of the downho!e end of the flow bypass sleeve of the first embodiment.
  • Figure 14 is a perspective view of a second embodiment of a flow bypass sleeve.
  • Figure 5 is a perspective view of the downhole end of the flow bypass sleeve of the second embodiment.
  • the embodiments described herein generally relate to a fluid pressure pulse generator of a telemetry tool that can generate pressure pulses.
  • the fluid pressure pulse generator may be used for mud pulse ("MP") telemetry used in downhole drilling, wherein a drilling fluid (herein referred to as "mud") is used to transmit telemetry pulses to surface.
  • the fluid pressure pulse generator may alternatively be used in other methods where it is necessary to generate a fluid pressure pulse.
  • the fluid pressure pulse generator comprises a stator and a rotor.
  • the stator may be fixed to a pulser assembly of the telemetry tool or to a drill collar housing the telemetry tool, and the rotor is fixed to a driveshaft coupled to a motor in the pulser assembly.
  • the motor rotates the driveshaft and rotor relative to the fixed stator.
  • FIG. 1 there is shown a schematic representation of MP telemetry operation using a fluid pressure pulse generator 130, 230, 330 according to embodiments disclosed herein.
  • drilling mud is pumped down a drill string by pump 2 and passes through a
  • the fluid pressure pulse generator 130, 230, 330 has an open flow position in which mud flows relatively unimpeded through the pressure pulse generator 130, 230, 330 and no pressuremodule is generated and a restricted flow position where flow of mud through the pressure pulse generator 130, 230, 330 is restricted and a positive pressure pulse is generated (represented schematically as block 6 in mud column 10).
  • Information acquired by downhole sensors (not shown) is transmitted in specific time divisions by pressure pulses 6 in the mud column 10.
  • signals from sensor modules (not shown) in the MWD tool 20, or in another downhole probe (not shown) communicative with the MWD tool 20, are received and processed in a data encoder in the MWD tool 20 where the data is digitally encoded as is well established in the art.
  • This data is sent to a controller in the MWD tool 20 which controls timing of the fluid pressure pulse generator 130, 230, 330 to generate pressure pulses 6 in a controlled pattern which contain the encoded data.
  • the pressure pulses 6 are transmitted to the surface and detected by a surface pressure transducer 7 and decoded by a surface computer 9 communicative with the transducer by cable 8.
  • the decoded signal can then be displayed by the computer 9 to a drilling operator.
  • the characteristics of the pressure pulses 6 are defined by duration, shape, and frequency and these characteristics are used in various encoding systems to represent binary data.
  • the MWD tool 20 generally comprises a fluid pressure pulse generator 130 according to a first embodiment which creates fluid pressure pulses, and a pulser assembly 26 which takes measurements while drilling and which drives the fluid pressure pulse generator 130.
  • the fluid pressure pulse generator 130 andmoduler assembly 26 are axially located inside a drill collar 27.
  • a flow bypass sleeve 170 according to a first embodiment is received inside the drill collar 27 and surrounds the fluid pressure pulse generator 130.
  • Themoduler assembly 26 is fixed to the drill collar 27 with an annular channel 55 therebetween, and mud flows along the annular channel 55 when the WD tool 20 is downhole.
  • Themoduler assembly 26 comprisesenclosing a motor subassembly and an electronics subassembly 28 electronically coupled together but fluidly separated by a feed-through connector ⁇ not shown).
  • the motor subassembly includes a motor and gearbox subassembly 23, a driveshaft 24 coupled to the motor and gearbox subassembly 23, and a pressure compensation device 48.
  • the fluid pressure pulse generator 130 comprises a stator and a rotor.
  • the stator comprises a stator body 141 with a bore therethrough and stator projections 142 radially extending around the downhole end of the stator body 141.
  • the rotor comprises generally cylindrical rotor body 169 with a central bore therethrough and a plurality of radially extending projections 162 at the downhole end thereof.
  • the stator body 141 comprises a cylindrical section at the uphoie end and a generally frusto-conical section at the downhole end which tapers longitudinally in the downhole direction.
  • the cylindrical section of stator body 141 is coupled with themoduler assembly housing 49. More specifically, a jam ring 158 threaded on the stator body 141 is threaded onto themoduler assembly housing 49. Once the stator is positioned correctly, the stator is held in place and the jam ring 58 is backed off and torqued onto the stator holding it in place.
  • the stator body 1 surrounds annular seal 54.
  • a small amount of mud may be able to enter the fluid pressure pulse generator 130 between the rotor and the stator however this entry point is downhole from annular seal 54 so the mud has to travel uphoie against gravity to reach annular seal 54.
  • the velocity of mud impinging on annular seal 54 may therefore be reduced and there may be less wear of seal 54 compared to other rotor/stator designs.
  • the external surface of themoduler assembly housing 49 is fiush with the external surface of the cylindrical section of the stator body 141 for smooth flow of mud therealong. In alternative embodiments (not shown) other means of coupling the stator with themoduler assembly housing 49 may be utilized and the external surface of the stator body 141 and the pulser assembly housing 49 may not be flush.
  • the rotor body 169 is received in the downhole end of the bore through the stator body 141 and a downhole portion 24a of the driveshaft 24 is received in uphole end of the bore through the rotor body 169.
  • a coupling key 30 extends through downhole driveshaft portion 24a and is received in a coupling key receptacle 164 (shown in Figure 3) at the uphole end of the rotor body 169 to couple the driveshaft 24 with the rotor body 169.
  • the coupling key 30 may any type of coupling key and may be a coupling key 30 with a zero backlash ring as described in WO 2014/071519 (incorporated herein by reference). Alternative means of coupling the rotor body 169 to the driveshaft 24 may be used as would be known to a person skilled in the art.
  • a rotor cap comprising a cap body 191 and a cap shaft 192 is positioned at the downhole end of the fluid pressure pulse generator 130.
  • the cap shaft 192 is received in the downhole end of the bore through the rotor body 169 and threads onto downhole driveshaft portion 24a to lock (torque) the rotor to the driveshaft 24.
  • the cap body 191 includes a hexagonal shaped opening 193 dimensioned to receive a hexagonal Allen key which is used to torque the rotor to the driveshaft 24.
  • the rotor cap 190 therefore releasably couples the rotor to the driveshaft 24 so that the rotor can be easily removed and repaired or replaced if necessary using the Allen key.
  • the rounded cone shaped cap body 191 may provide a streamlined flow path for mud and may reduce wear of the rotor projections 162 caused by recirculation of mud.
  • the rounded cap body 191 may also reduce torque required to rotate the rotor by reducing turbulence downhole of the rotor.
  • Positioning the rotor body 169 in the bore of the stator body 141 may protect the rotor body 169 from wear caused by mud erosion. Rotation of the driveshaft 24 by the motor and gearbox subassembly 23 rotates the rotor relative to the fixed stator.
  • the electronics subassembly 28 includes downhole sensors, control electronics, and other components required by the MWD tool 20 to determine direction and inclination information and to take measurements of drilling conditions, to encode this telemetry data using one or more known modulation techniques into a carrier wave, and to send motor control signals to the motor and gearbox subassembly 23 to rotate the driveshaft 24 and rotor in a controlled pattern to generate pressure pulses 6 representing the carrier wave for transmission to surface.
  • the motor subassembly is filled with a lubricating liquid such as hydraulic oil or silicon oil and this lubricating liquid is fluidly separated from mud flowing along the annular channel 55 by annular seal 54 which surrounds the driveshaft 24.
  • the pressure compensation device 48 comprises a flexible membrane (not shown) in fluid
  • the pressure compensation device 48 may be any pressure compensation device known in the art, such as pressure compensation devices that utilize pistons, metal membranes, or a bellows style pressure compensation mechanism.
  • the fluid pressure pulse generator 130 is located at the downhole end of the MWD tool 20. Mud pumped from the surface by pump 2 flows along annular channel 55 between the outer surface of the pulser assembly 26 and the inner surface of the drill collar 27. When the mud reaches the fluid pressure pulse generator 130 it flows along an annular channel 56 provided between the externa! surface of the stator body 141 and the internal surface of the flow bypass sleeve 170. The rotor rotates between an open flow position where mud flows freely through the fluid pressure pulse generator 130 resulting in no pressure pulse and a restricted flow position where flow of mud is restricted to generate pressure pulse 6.
  • the stator projections 142 have a radial profile with an uphole end 146 and an downhole radial face 145.
  • a first side face 47a, an opposed second side face 47b and an outer face 149 extend between the uphole end 146 and the downhole radial face 145.
  • the downhole edge of the first side face 147a is uphole relative to the downhole edge of the second side face 147b such that the downhole radial face 145 is sloped or angled in the downhole direction from the first side face 147a to the second side face 147b.
  • the stator projections 1 2 are tapered and narrower at their proximal end attached to the stator body 141 than at their distal end.
  • the uphole end 146 is rounded and the radial profile of the stator projections 142 tapers towards the rounded uphole end 146 such that the outer face 149 tapers towards the uphole end 146 and the uphole end 146 is narrower than the downhole radial face 145. Mud flowing along the external surface of the stator body 141 contacts the uphole end 146 of the stator projections 142 and flows through stator flow channels 143 defined by the side faces 147a, 147b of adjacently positioned stator projections 142.
  • the stator flow channels 143 are curved or rounded at their proximal end closest to the stator body 141 .
  • the curved stator flow channels 143, as well as the tapered radial profile and rounded uphole end 146 of the stator projections 142 may provide smooth flow of mud through the stator flow channels 143 and may reduce wear of the stator projections 142 caused by erosion.
  • none or only some of the stator projections 142 may be tapered and the uphole end 46 may not be rounded .
  • only one or some of the stator projections 142 may have a sloped downhole radial face 145.
  • the radially extending rotor projections 162 are equidistantly spaced around the downhole end of the rotor body 169 and are axially adjacent and downhole relative to the stator projections 142 in the assembled fluid pressure pulse generator 130.
  • the rotor projections 162 rotate in and out of fluid communication with the stator flow channels 143 to generate pressure pulses 6.
  • the rotor projections 162 have a radial profile with an uphole radial face 166 and a downhole end 165.
  • a first side face 167a, an opposed second side face 67b and an outer face 161 extend between the upho!e radial face 166 and the downhole end 165.
  • the uphole edge of the first side face 167a is uphole relative to the uphole edge of the second side face 167b such that the uphole radial face 166 of the rotor projections 162 is sloped or angled in the downhole direction from the first side face 147a to the second side face 147b.
  • the slope or angle of the uphole radial face 166 of the rotor projections 162 corresponds to the slope or angle of the downhole radial face 145 of the stator projections 142; however in alternative embodiments the slope or angle of the uphole radial face 166 of the rotor projections 162 may not correspond to the slope or angle of the downhole radial face 145 of the stator projections 142.
  • the rotor projections 162 taper in the downhole direction towards the downhole end 165, such that the width of the outer face 161 tapers towards the downhole end 165.
  • the rotor projections 162 taper radially in the downhole direction, such that the radial thickness of the uphole radial face 166 is greater than the radial thickness of the downhole end 165 giving the rotor projections 162 a wedge like shape.
  • the wedge shaped rotor projections 162 are therefore longitudinally extended and taper both along their axis and radially.
  • Rotor flow channels 163 defined by side faces 167a and 167b of adjacent rotor projections 162 are curved or rounded at the proximal end closest to the rotor body 169 for smooth flow of mud therethrough which may reduce wear of the rotor projections 162.
  • Positioning the stator projections 142 uphole of the rotor projections 162 may protect the rotor projections 162 from wear as they are protected from mud flow by the stator projections 142 when the rotor 160 is in the open flow position.
  • only some or none of the rotor projections 162 may be tapered.
  • only one or some of the rotor projections 162 may have a sloped or angled uphole radial face 66.
  • a controller ⁇ not shown) in the electronics subassembly 28 sends motor control signals to the motor and gearbox subassembly 23 to rotate the driveshaft 24 and rotor 160 in a controlled pattern to generate pressure pulses 6.
  • the rotor 160 starts in the open flow position shown in Figures 4 and 5 where the downhole radial face 145 of the stator projections 142 faces and axially aligns with the uphole radial face 166 of the rotor projections 162 and mud flows unrestricted from the stator flow channels 143 to the rotor flow channels 163.
  • the rotor 160 then rotates 60 degrees clockwise to the restricted flow position shown in Figures 6 and 7 where the rotor projections 162 align with the stator flow channels 143.
  • Some mud flows from the stator flow channels 143 to the rotor flow channels 163 through a sloped axial gap between the downhole radial face 145 of the stator projections 142 and the uphole radial face 166 of the rotor projections 162; however the flow of mud is restricted compared to flow of mud through the flow channels 143, 163 in the open flow position and pressure pulse 6 is generated,
  • the rotor 160 then rotates 60 degrees counter-clockwise back to the open flow position.
  • the axial gap between the down hole radial face 145 of the stator projections 142 and the uphole radial face 166 of the rotor projections 162 in the restricted flow position may be varied depending on mud flow conditions downho!e. For example, for a fluid pressure pulse generator 130 used in high mud flow conditions the axial gap may be larger and allow a greater volume of mud to flow from the stator flow channels 143 to the rotor flow channels 163 in the restricted flow position than the axial gap in a fluid pressure pulse generator 130 used in low mud flow conditions.
  • the volume of mud flowing through the pressure pulse generator 130 in the restricted flow position may be controlled and may reduce pressure build up which cou!d lead to damage of the rotor 160 or stator 140 or other parts of the MWD tool 20.
  • the size of the axial gap may be varied by varying the angle of the sloped radial faces 145, 166 and the greater the angle of the sloped faces 145, 166 the larger the axial gap may be.
  • the sloped downhole radial face 145 of the stator projections 142 and the sloped uphole radial face 166 of the rotor projections 162 prevent rotation of the rotor 160 beyond 60 degrees in either direction and therefore function as a mechanical stop to limit the rotational span of the rotor 160.
  • the uphole edge of rotor projection side face 167a is uphole relative to the downhole edge of stator projection side face 147b, therefore when the rotor 160 rotates clockwise to the restricted flow position shown in Figure 6 and 7 an uphole portion of the rotor projection side face 167a abuts a downhole portion of the stator projection side face 147b preventing further rotation in the clockwise direction .
  • the slope of the downhole radial face 145 of the stator projections 142 and uphole radial face 166 of the rotor projections 162 prevents further rotation in the counter-clockwise direction.
  • the downhole radial face 145 of the stator projections 142 and uphole radial face 166 of the rotor projections 162 may be sloped in the opposite direction such that the downhole edge of stator projection side face147b is uphole relative to the downhole edge of stator projection side face 147a and the uphole edge of rotor projection side face 167b is uphole relative to the uphole edge of rotor projection side face 167a.
  • the rotor 160 rotates counter-clockwise from the open flow position to the restricted flow position and clockwise back to the open flow position to generate pressure pulse 6.
  • the sloped profile of the stator projection downhole radial face 145 and the rotor projection uphole radial face 166 may not extend along the entire radial length of each face 1 5, 166.
  • the fluid pressure pulse generator 130 may be positioned at the uphole end of the MWD tool 20. Referring now to Figures 8 and 9, there is shown a fluid pressure pulse generator
  • the stator 240 comprises a stator body 241 and a plurality of stator projections 242 radially extending around the downhole end of the stator body 241 .
  • the stator projections 242 have a radial profile with an uphole end 246 and an downhole radial face 245.
  • a first side face 247a, an opposed second side face 247b and an outer face 249 extend between the uphole end 246 and the downhole radial face 245.
  • a portion of the downhole radial face 245 extending along the downhole edge of the second side face 247b is perpendicular to the longitudinal axis of the fluid pressure pulse generator 230 and the remaining portion of the downhole radial face 245 extending along a downhole edge of the first side face 247a is sloped or angled in the downhole direction from the downhole edge of the first side face 247a to the perpendicular portion of the downhole radial face 245.
  • the downhole edge of the first side face 247a is uphole relative to the downhole edge of the second side face 247b.
  • the stator projections 242 are tapered and narrower at their proximal end attached to the stator body 241 than at their distal end.
  • the uphole end 246 is rounded and the radial profile of the stator projections 242 tapers towards the rounded uphole end 246 such that the outer face 249 tapers towards the uphole end 246 and the uphole end 246 is narrower than the downhole radial face 245.
  • Mud flowing along the external surface of the stator body 241 contacts the uphole end 246 of the stator projections 242 and flows through stator flow channels 243 defined by the side faces 247a, 247b of adjacently positioned stator projections 242.
  • none or only some of the stator projections 242 may be tapered and the uphole end 246 may not be rounded.
  • only one or some of the stator projections 242 may have a sloped or angled portion of the downhole radial face 245.
  • the rotor 260 comprises rotor body (not shown) and a plurality of radially extending rotor projections 262 equidistantly spaced around the downhole end of the rotor body.
  • the rotor projections 262 are axially adjacent and downhole relative to the stator projections 242 in the assembled fluid pressure pulse generator 230.
  • the rotor projections 262 rotate in and out of fluid communication with the stator flow channels
  • the rotor projections 262 have a radia! profile with an uphole radial face 266 and a downhole end 265, A first side face 267a, an opposed second side face 267b and an outer face 261 extend between the uphole radial face 266 and the downhole end 265.
  • a portion of the uphole radial face 266 extending along the uphole edge of the second side face 267b is perpendicular to the longitudinal axis of the fluid pressure pulse generator 230 and the remaining portion of the uphole radial face 266 extending along the uphole edge of the first side face 267a is sloped or angled in the downhole direction from the uphole edge of first side face 267a to the
  • the uphole edge of the first side face 267a is uphole relative to the uphole edge of the second side face 267b.
  • the sloped profile of the uphole radial face 266 of the rotor projections 262 corresponds to the sloped profile of the downhole radial face 245 of the stator projections 242; however in alternative embodiments the profile of the uphole radial face 266 of the rotor projections 262 may not correspond to the profile of the downhole radial face 245 of the stator projections 242.
  • the rotor projections 262 taper in the downhole direction towards the downhole end 265, such that the width of the outer face 261 tapers towards the downhole end 265.
  • the rotor projections 262 taper radially in the downhole direction , such that the radial thickness of the uphole radial face 266 is greater than the radial thickness of the downhole end 265 giving the rotor projections 262 a wedge like shape.
  • the wedge shaped rotor projections 262 are therefore longitudinally extended and taper both along their axis and radially.
  • Rotor flow channels 263 defined by side faces 267a and 267b of adjacent rotor projections 262 are curved or rounded at the proximal end closest to the rotor body 269 for smooth flow of mud therethrough.
  • only some or none of the rotor projections 262 may be tapered
  • only one or some of the rotor projections 262 may have a sloped or angled portion of the uphole radial face 266.
  • Rotor cap 290 comprising a cap body 291 and a cap shaft (not shown) releasably couples the rotor body to the driveshaft 24 of the MWD tool 20 as described above in more detail with reference to Figure 2.
  • the rotor 260 is rotated respectively 60 degrees clockwise and 60 degrees counter-clockwise between the open flow position shown in Figure 8 and the restricted flow position shown in Figure 9.
  • the open flow position the downhole radial face 245 of the stator projections 242 faces and axially aligns with the uphole radial face 266 of the rotor projections 262 and mud flows unrestricted from the stator flow channels 243 to the rotor flow channels 263 with zero pressure.
  • the rotor projections 262 align with the stator flow channels 243.
  • the axial gap between the downhole radial face 245 of the stator projections 242 and the upho!e radial face 266 of the rotor projections 262 in the restricted flow position may be varied depending on mud flow conditions downhole as described in more detail above with reference to Figures 4 to 7.
  • the fluid pressure pulse generator 230 of the second embodiment functions as a mechanical stop to limit the rotational span of the rotor 260. More specifically, the uphole edge of rotor projection side face 267a is uphole relative to the downhole edge of stator projection side face 247b, therefore when the rotor 260 rotates clockwise to the restricted flow position shown in Figure 9, an uphole portion of the rotor projection side face 267a abuts a downhole portion of the stator projection side face 247b preventing further rotation in the clockwise direction.
  • the sloped portions of the downhole radial face 245 of the stator projections 242 and the uphole radial face 266 of the rotor projections 262 prevents further rotation in the counter-clockwise direction.
  • the stator projection downhole radial face 245 and the rotor projection uphole radial face 266 may be sloped in the opposite direction .
  • the rotor 260 rotates counter-clockwise from the open flow position to the restricted flow position and clockwise back to the open flow position.
  • the sloped portion of the stator projection downhole radial face 245 and the rotor projection uphole radial face 266 may not extend along the radial length of each face 245, 266, For example only the outer radial portion of the downhole radial face 245 and the uphole radial face 266 may have a sloped portion.
  • the fluid pressure pulse generator 230 may be positioned at the uphole end of the MWD tool 20 Referring now to Figures 10 and 1 1 , there is shown a fluid pressure pulse generator 330 according to a third embodiment comprising a stator 340, a rotor 360 and a rotor cap 390.
  • the stator 340 comprises a stator body 341 and a plurality of stator projections 342 radially extending around the downhole end of the stator body 341 .
  • the stator projections 342 have a radial profile with an uphole end 346 and an downhole radial face 345.
  • a first side face 347a, an opposed second side face 347b and an outer face 349 extend between the uphole end 346 and the downhole radial face 345.
  • the downhole radial face 345 is perpendicular to the longitudinal axis of the fluid pressure pulse generator 330 and has a stepped profile with a portion of the downhole face 345 extending along the downhole edge of the second side face 347b being downhole relative to the remaining portion of the downhole radial face 345 extending along a downhole edge of the first side face 347a,
  • the downhole edge of the first side face 347a is uphole relative to the downhole edge of the second side face 347b.
  • the stator projections 342 are tapered and narrower at their proximal end attached to the stator body 341 than at their distal end.
  • the uphole end 346 is rounded and the radial profile of the stator projections 342 tapers towards the rounded uphole end 346 such that the outer face 349 tapers towards the uphole end 346 and the uphole end 346 is narrower than the downhole radial face 345. Mud flowing along the external surface of the stator body 341 contacts the uphole end 346 of the stator projections 342 and flows through stator flow channels 343 defined by the side faces 347a, 347b of adjacently positioned stator projections 342, In alternative embodiments none or only some of the stator projections 342 may be tapered and the uphole end 346 may not be rounded.
  • stator projections 342 may have a stepped downhole radial face 345.
  • the rotor 360 comprises rotor body (not shown) and a plurality of radially extending rotor projections 362 equidistantly spaced around the downhole end of the rotor body.
  • the rotor projections 362 are axially adjacent and downhole relative to the stator projections 342 in the assembled fluid pressure pulse generator 330.
  • the rotor projections 362 rotate in and out of fluid communication with the stator flow channels 343 to generate pressure pulses 6.
  • the rotor projections 362 have a radial profile with an uphole radial face 366 and a downhole end 365.
  • a first side face 367a, an opposed second side face 367b and an outer face 361 extend between the uphole radial face 366 and the downhole end 365.
  • the uphole radial face 366 is perpendicular to the longitudinal axis of the fluid pressure pulse generator 330 and has a stepped profile with a portion of the uphole radial face 366 extending along the uphole edge of the second side face 367b being downhole relative to the remaining portion of the uphole radial face 366 extending along the upho!e edge of the first side face 367a.
  • the uphole edge of the first side face 367a is uphole relative to the uphole edge of the second side face 367b.
  • the stepped profile of the uphole radial face 366 of the rotor projections 362 corresponds to the stepped profile of the downhole radial face 345 of the stator projections 342; however in alternative embodiments the profile of the uphole radial face 366 of the rotor projections 362 may not correspond to the profile of the downhole radial face 345 of the stator projections 342.
  • the rotor projections 362 taper in the downhole direction towards the downhole end 365, such that the width of the outer face 361 tapers towards the downhole end 365.
  • the rotor projections 362 taper radially in the downhole direction, such that the radial thickness of the uphole radial face 366 is greater than the radial thickness of the downhole end 365 giving the rotor projections 362 a wedge like shape.
  • the wedge shaped rotor projections 362 are therefore longitudinally extended and taper both along their axis and radially.
  • Rotor flow channels 363 defined by side faces 367a and 367b of adjacent rotor projections 362 are curved or rounded at the proximal end closest to the rotor body 369 for smooth flow of mud therethrough.
  • only some or none of the rotor projections 362 may be tapered .
  • only some of the rotor projections 362 may have a stepped uphole radial face 366.
  • Rotor cap 390 comprising a cap body 391 and a cap shaft (not shown) releasably couples the rotor body to the driveshaft 24 of the MWD tool 20 as described above in more detail with reference to Figure 2.
  • the rotor 360 is rotated 60 degrees clockwise and 60 degrees counter-clockwise between the open flow position shown in Figure 10 and the restricted flow position shown in Figure 1 1 respectively.
  • the downhole radial face 345 of the stator projections 342 faces and axially aligns with the uphole radial face 366 of the rotor projections 362 and mud flows unrestricted from the stator flow channels 343 to the rotor flow channels 363 with zero pressure, !n the restricted flow position the rotor projections 362 align with the stator flow channels 343.
  • the axial gap between the downhole radial face 345 of the stator projections 342 and the uphole radial face 366 of the rotor projections 362 in the restricted flow position may be varied depending on mud flow conditions downhole as described in more detail above with reference to Figures 4 to 7.
  • the fluid pressure pulse generator 330 of the third embodiment functions as a mechanical stop to limit the rotational span of the rotor 360. More specifically, the uphole edge of rotor projection side face 367a is uphole relative to the downhole edge of stator projection side face 347b, therefore when the rotor 360 rotates clockwise to the restricted flow position shown in Figure 1 1 , an uphole portion of the rotor projection side face 367a abuts a downhole portion of the staior projection side face 347b preventing further rotation in the clockwise direction.
  • the downhole and uphole portions of the stepped profile of the downhole radial face 345 of the stator projections 342 may be opposite to the stepped portions shown in Figures 10 and 1 1 , and the corresponding downhole and uphole portions of the stepped profile of the uphole radial face 366 of the rotor projections 362 may also be opposite.
  • the rotor 360 rotates counter-clockwise from the open flow position to the restricted flow position and clockwise back to the open flow position.
  • the stepped profile of the stator projection downhole radial face 345 and the rotor projection uphole radial face 366 may not extend along the radial length of each face 345, 366.
  • the fluid pressure pulse generator 330 may be positioned at the uphole end of the WD tool 20
  • the mechanical stop mechanism provided by the embodiments described herein may reduce the amount of parts required in the MWD tool 20 as the mechanical stop mechanism is provided by the fluid pressure pulse generator 130, 230, 330, and does not require a separate mechanical stop mechanism, such as the mechanical stop collar described in WO 2014/071519.
  • a separate mechanical stop mechanism such as the mechanical stop collar described in WO 2014/071519.
  • the span of rotation is limited thereby reducing wear of the motor, seals, and other components associated with rotation, in alternative embodiments (not shown) more or less rotor projections 162, 262, 362 and stator projections 142, 242, 342 may be present and the span of rotation may vary depending on the amount of rotation required to rotate the rotor 160, 260, 360 between the open flow position and the restricted flow position.
  • the frequency of pressure pulses 6 that can be generated may be increased with a reduced span of rotation of the rotor 160, 260, 360 and, as a result, the data acquisition rate may be increased.
  • stator projections are uphole relative to the rotor projections, and the downhole radial face of the stator projections and the uphole radial face of the rotor projections axia!ly align and face each other in the open flow position.
  • the rotor projections may be uphole relative to the stator projections, and a downhole radial face of the rotor projections and an uphole radial face of the stator projections may axially align and face each other in the open flow position.
  • a portion of the radial face of one or more of the stator projections and/or one or more of the rotor projections may have a raised profile relative to the remainder of the radiai face.
  • the raised profile portion of the radial face functions as a stopper portion to limit the span of rotation of the rotor relative to the stator.
  • the stopper portion is downhole relative to at least a portion of the axially aligned uphole radiai face of the other of the stator or rotor projections.
  • the radial face of one or more of the stator projections may include a flange or lip extending radially along a side edge thereof or along an outer radial portion or any portion of the radial face
  • the radial face of one or more rotor projections may include a groove which mates with the flange when the rotor is in the open fiow position and prevents further rotation in either the clockwise or counter-clockwise direction depending on the position of the flange on the radial face.
  • the side faces of the rotor projections abut the flange on the radial face of the stator projections thereby limiting further rotation in that direction.
  • the flange or lip may be present on the radial face of one or more of the rotor projections and the groove may be present on the radial face of one or more of the stator projections.
  • the radial face of one or more of the stator projections may include a flange or lip extending radially along a side edge thereof or along an outer radial portion or any portion of the radial face, whereas the entire surface of the radial face of the rotor projections may be perpendicular to the longitudinal axis of the fluid pressure pulse generator (i.e. have no raised profile).
  • the flange or lip limits the rotational span of the rotor relative to the stator by abutting the side faces of adjacent rotor projections when in the open and restricted flow positions.
  • the flange or lip may be present on the radial face of one or more of the rotor projections and surface of the radial face of the stator projections may be perpendicular to the longitudinal axis of rotation.
  • FIG. 12 and 13 there is shown the first embodiment of the flow bypass sleeve 170 comprising a generally cylindrical sleeve body with a central bore therethrough made up of an uphole body portion 171 a and a downhole body portion 171 b.
  • a second embodiment of a flow bypass sleeve 270 is shown comprising a generally cylindrical sleeve body with a central bore therethrough made up of an uphole body portion 271 a and a downhole body portion 271 b.
  • the external surface of uphoie body portion 171 a, 271 a includes an annular shoulder 180, 280 near the uphole end of uphole body portion 171 a, 271 a respectively which abuts a downhole shoulder of a keying ring (not shown) that is press fitted into the drill collar 27.
  • a threaded ring (not shown) fixes the flow bypass sleeve 170, 270 within the drill collar 27.
  • a groove 185, 285 on the external surface of the uphole body portion 171 a, 271 a respectively receives an o-ring (not shown) and a rubber back-up ring (not shown) such as a parbak to heip seat the flow bypass sleeve 170, 270 and reduce fluid leakage between the flow bypass sleeve 170, 270 and the drill collar 27.
  • the flow bypass sleeve 170, 270 may be assembled or fitted within the drill collar 27 using alternative 5 fittings as would be known to a person of skill in the art.
  • the diameter of the bore through the sleeve body is smallest at a central section 177 which surrounds the stator projections 142 and rotor projections 62.
  • the outer diameter of the stator projections 1 2 may be dimensioned such that the stator projections 142 contact the internal surface of the centra! section
  • the outer diameter of the rotor projections 162 is slightly less than the internal diameter of the central section 177 of the sleeve body to allow rotation of the rotor projections 162 relative to the sleeve body.
  • the bore through the sleeve body gradually increases in diameter from the central section 177 towards the downhole end of the sleeve body to define an internally tapered downhole section 176.
  • the uphole section 179 of sleeve body surrounds the frusto-conical section of stator body 141 with the annular channel 56 extending
  • the downhole section 176 of the sleeve body surrounds the rotor cap body 191 .
  • the internal surface of the uphole body portion 171 a includes a plurality of longitudinal extending grooves 173. Grooves 173 are equidistantly spaced around the internal surface of the uphole body
  • the flow bypass sleeve 170 may be precisely located with respect to the drill collar 27 using a keying notch (not shown) to ensure correct alignment of the stator projections 142 with the internal walls 174.
  • a plurality of apertures 275 extend longitudinally through the uphole body portion 271 a.
  • the apertures 275 are circular and equidistantly spaced around uphole body portion 271 a.
  • the internal surface of the downhole body portion 271 b includes a plurality of spaced grooves 278 which align with the apertures 275 in the assembled flow bypass sleeve 270 (shown in Figure 15), such that mud is channelled through the apertures 275 and into grooves 278.
  • uphole body portion 271 a which surrounds the rotor and stator projections 162, 142 is uniform in this embodiment; therefore there is no need to align the stator projections 142 with any internal feature of the uphoie body portion 271 a as with the first embodiment of the flow bypass sleeve 170 described above.
  • the apertures 275 may be any shape and need not be equidistantly spaced around the sleeve body. The number and size of the apertures 275 may be chosen for the desired amount of mud flow therethrough.
  • the grooves 278 may have a different shape or may not be present at all.
  • the sleeve body may include aperture 275 and internal grooves 173.
  • the external dimensions of flow bypass sleeve 170, 270 may be adapted to fit any sized drill collar 27. It is therefore possible to use a one size fits all fluid pressuremodule generator 130, 230, 330 with multiple sized flow bypass sleeves 170, 270 with various different externa! circumferences that are dimensioned to fit different sized drill collars 27. Each of the multiple sized flow bypass sleeves 170, 270 may have the same interna! dimensions to receive the one size fits all fluid pressure pulse generator 130, 230, 330 but different external dimensions to fit the different sized drill collars 27.
  • the volume of mud flowing through the drill collar 27 will generally be greater than the volume of mud flowing through smaller diameter drill collars 27, however the bypass channels (e.g. grooves 173 and/or apertures 275) of the flow bypass sleeve 170, 270 may be dimensioned to accommodate this greater volume of mud.
  • the bypass channels of the different sized flow bypass sleeves 170, 270 may therefore be dimensioned such that the volume of mud flowing through the one size fits all fluid pressure pulse generator 130, 230, 330 fitted within any sized drill collar 27 is within an optimal range for generation of pressure pulses 6 which can be detected at the surface without excessive pressure build up.
  • fluid pressure pulse generator 130 It may therefore be possible to control the flow rate of mud through the fluid pressure pulse generator 130, 230, 330 using different flow bypass sleeves 170, 270 rather than having to fit different sized fluid pressure pulse generators 30, 230, 330 to the pulser assembly 26.
  • the fluid pressure pulse generator 130 In alternative embodiments (not shown), the fluid pressure pulse generator 130,
  • stator projections 142, 242, 342 and rotor projections 162, 262, 362 may be radially extended to have an external diameter that is greater than the external diameter of the cylindrical section of the stator body 141 , 241 , 341 , such that mud following along annular channel 55 impinges on the stator projections 142, 242, 342 and is directed through the stator flow channels 143, 243, 343.
  • the stator projections 142, 242, 342 and rotor projections 162, 262, 362 may radially extend to meet the internal surface of the drill collar 27. There may be a small gap between the rotor projections 162, 262, 362 and the internal surface of the drill collar 27 to allow rotation of the rotor projections 162, 262, 362.
  • the innovative aspects apply equally in embodiments such as these.

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Abstract

L'invention concerne un générateur d'impulsions de pression de fluide pour un outil de télémétrie, comprenant un stator et un rotor. Des saillies de rotor sont adjacentes et rotatives axialement par rapport à des saillies de stator entre une position d'écoulement ouverte, dans laquelle les saillies de rotor s'alignent axialement avec les saillies de stator, et une position d'écoulement restreinte, dans laquelle les saillies de rotor s'alignent axialement avec les canaux d'écoulement de stator pour créer des impulsions de pression de fluide dans un fluide s'écoulant à travers les canaux d'écoulement de stator. Au moins une face radiale de haut de trou comprend une partie de butée qui est en amont par rapport à au moins une partie de la face radiale de fond de trou alignée axialement, et/ou au moins une face radiale de fond de trou comprend une partie de butée qui est en aval par rapport à au moins une partie de la face radiale de haut de trou alignée axialement, de telle sorte que la partie de butée limite la portée de rotation du rotor par rapport au stator.
PCT/CA2016/051298 2015-11-12 2016-11-08 Générateur d'impulsions de pression de fluide pour outil de télémétrie WO2017079829A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11339649B2 (en) 2018-07-16 2022-05-24 Baker Hughes Holdings Llc Radial shear valve for mud pulser
WO2023092061A1 (fr) * 2021-11-19 2023-05-25 Rime Downhole Technologies, Llc Procédé et dispositif de balayage de cycle de générateur d'impulsions

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1228909A (fr) * 1983-10-24 1987-11-03 Jose Trevino Generateur d'impulsions de pression
CA1299998C (fr) * 1987-09-22 1992-05-05 David Malone Generateur de modulation sinusoidale de la pression pour outil mwd
CA2098676A1 (fr) * 1992-08-21 1994-02-22 David Malone Outils de sondage et de forage, systemes et methodes pour la transmission de donnees a differentes frequences
US5636178A (en) * 1995-06-27 1997-06-03 Halliburton Company Fluid driven siren pressure pulse generator for MWD and flow measurement systems
CA2855930A1 (fr) * 2011-11-14 2013-05-23 Halliburton Energy Services, Inc. Appareil et procede de production d'impulsions de donnees dans un train de forage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1228909A (fr) * 1983-10-24 1987-11-03 Jose Trevino Generateur d'impulsions de pression
CA1299998C (fr) * 1987-09-22 1992-05-05 David Malone Generateur de modulation sinusoidale de la pression pour outil mwd
CA2098676A1 (fr) * 1992-08-21 1994-02-22 David Malone Outils de sondage et de forage, systemes et methodes pour la transmission de donnees a differentes frequences
US5636178A (en) * 1995-06-27 1997-06-03 Halliburton Company Fluid driven siren pressure pulse generator for MWD and flow measurement systems
CA2855930A1 (fr) * 2011-11-14 2013-05-23 Halliburton Energy Services, Inc. Appareil et procede de production d'impulsions de donnees dans un train de forage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11339649B2 (en) 2018-07-16 2022-05-24 Baker Hughes Holdings Llc Radial shear valve for mud pulser
GB2590298B (en) * 2018-07-16 2022-08-03 Baker Hughes Holdings Llc Radial Shear Valve For Mud Pulser
WO2023092061A1 (fr) * 2021-11-19 2023-05-25 Rime Downhole Technologies, Llc Procédé et dispositif de balayage de cycle de générateur d'impulsions
US11982181B2 (en) 2021-11-19 2024-05-14 Rime Downhole Technologies, Llc Pulser cycle sweep method and device

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