WO2011146987A1 - Connexion électrique à translation - Google Patents

Connexion électrique à translation Download PDF

Info

Publication number
WO2011146987A1
WO2011146987A1 PCT/AU2011/000629 AU2011000629W WO2011146987A1 WO 2011146987 A1 WO2011146987 A1 WO 2011146987A1 AU 2011000629 W AU2011000629 W AU 2011000629W WO 2011146987 A1 WO2011146987 A1 WO 2011146987A1
Authority
WO
WIPO (PCT)
Prior art keywords
indexing
sensor device
axis
cable
down hole
Prior art date
Application number
PCT/AU2011/000629
Other languages
English (en)
Inventor
Richard Parfitt
Original Assignee
Imdex Technology Australia Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AU2010902278A external-priority patent/AU2010902278A0/en
Application filed by Imdex Technology Australia Pty Ltd filed Critical Imdex Technology Australia Pty Ltd
Publication of WO2011146987A1 publication Critical patent/WO2011146987A1/fr

Links

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
    • E21B47/02—Determining slope or direction
    • E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/028—Electrical or electro-magnetic connections

Definitions

  • This invention relates to a connection for maintaining electrical connectivity between two parts adapted to undergo relative movement.
  • the invention also relates to a down hole survey tool incorporating such a connection. Further, the invention also relates to a method of performing a down hole surveying operation.
  • Surveying a borehole is usually accomplished using a surveying tool which is moved along the borehole to obtain the information required, or at least data from which the required information can be determined.
  • Information in relation the path of a borehole can typically include inclination, azimuth and depth.
  • Surveying tools typically contain sensor devices for measuring the direction and magnitude of the local gravitational field, and also the rate of rotation of the Earth. These measurements correspond to the position and orientation of the surveying tool in the borehole. The position, inclination and/or azimuth can be calculated from these measurements.
  • the sensor devices can comprise accelerometers for measuring the direction and magnitude of the local gravitational field, and gyroscopes for measuring the rate of rotation of the Earth, from which azimuth can be calculated.
  • index gyroscopes With a view to eliminating, or at least reducing the systematic errors, it is known to index gyroscopes through 180 degrees between two indexing positions, with measurements being taken at the two indexing positions. Because the indexing positions are 180 degrees apart, the measurements will be reversed; that is, the measurements deliver the same data but with reversed polarity. With these measurements, the systematic errors can be eliminated or diminished.
  • the need to index and orient the sensor devices can introduce cost and complexity to the surveying tool, and can be particularly problematic where a survey tooling of compact construction is required.
  • the sensors are required to be carried on a platform which is supported for- rotation on a base forming part of the down hole surveying tool.
  • a base forming part of the down hole surveying tool.
  • electrical connectivity between the rotating platform and the base.
  • connection for maintaining electrical connectivity between two parts adapted to undergo relative movement, the connection comprising a flexible connecting cable extending between the two parts, with one end section of the cable connected to one part, the other end section of the cable connected to the other part, and an intermediate section of the cable configured as a loop.
  • the cable may comprise a flat multi-core cable.
  • the loop may be accommodated in a cable receptacle having two opposed sides and an open end through which the cable extends. .
  • the loo may comprise two straight sections and a turn section extending between the two straight sections.
  • the two straight sections may be constrained and guided by sides of the cable receptacle, with one straight section being adapted to undergo translation motion, sliding along the adjacent side of the cable receptacle upon relative movement between the two parts. This accommodates relative movement between the two parts.
  • the turn section rolls within the cable receptacle in unison with the translating straight section.
  • the portions of the cable which constitute the two straight sections and the turn section vary as the straight section translates and the turn section rolls.
  • Such an arrangement provides a simple yet highly effective electrical connection between connectivity between the two parts, which is compact and which obviates the need for a conventional slip ring assembly for electrical connectivity.
  • the two parts may comprise parts of a down hole surveying tool.
  • One part may comprise a rotary mount supporting a sensor device and the other part may comprise a base on which the rotary mount is rotatably mounted.
  • a down hole surveying tool comprising a connection according to the first aspect of the invention.
  • a down hole surveying tool comprising a sensor device rotatable about an indexing axis, a base, a support for supporting the sensor devic for; rotation about the indexing axis, the support comprising a rotary mount Supported on the base for rotation about a pitch axis transverse to the indexing axis, and. a connection for maintaining electrical connectivity between the rotary mount and the base, the connection comprising a flexible connecting cable extending between the rotary mount and the base, with one end section of the cable connected to the rotary mount , the other end section of the cable connected to the base, and an intermediate section of the cable configured as a loop.
  • the base accommodates electronic circuitry for the surveying tool, specifically electronic circuit boards.
  • the cable receptacle is mounted on the base.
  • the sensor device may be of any appropriate type; for example, the sensor device may comprise one of more gyroscopes, one or more accelerometers or a combination thereof. Where the sensor device comprises, a gyroscope, the latter may comprise a two- axis gyroscope mounted on the support such that the two sensitive axes are perpendicular to the indexing axis.
  • the sensor device comprises an accelerometer
  • the latter may comprise a two-axis accelerometer mounted on the support such that the two sensitive axes are perpendicular to the indexing axis.
  • the sensor device may comprise a two-axis gyroscope and a two-axis accelerometerj with the respective sensitive axes perpendicular to the indexing axis.
  • the two-axis gyroscope and a two-axis accelerometer may be interconnected for rotation in unison about the indexing axis.
  • a method of performing a down hole survey operation comprising: positioning a survey tool at a selected location within a borehole, the survey tool having a sensor device with at least two sensitive axes; orienting the sensor device such that the two sensitive axes occupy a selected plane; obtaining a measurement from the sensor device at the selected location; moving the sensor device into an indexing position at which the sensor device can be indexed about an indexing axis perpendicular to. the two sensitive axes; returning the indexed sensor device to the position at which the two sensitive axes occupied the selected plane; and obtaining a further measurement from the sensor device at the selected location.
  • Figure 1 is a perspective view of a down hole surveying tool incorporating an electrical connection according to the embodiment, with part of the exterior housing of the tool removed to reveal internal features; .
  • Figure 2 is a view similar to Figure 1 but with further parts removed to reveal additional internal features;
  • Figure 3 is schematic plan view of a rotary mount for a sensor device movable between two indexing positions, the rotary mount being configured as an indexing platform, and an indexing mechanism operable in conjunction with the indexing platform;
  • Figure 4 is a side view of the. arrangement shown in Figure 3;
  • Figure 5 is perspective view of the indexing platform and the indexing mechanism, with the indexing platform shown in a first position;
  • Figure 6 is a view similar to Figure 5, except that the indexing platform is shown rotated into a second position for operation of the indexing mechanism;
  • Figure 7 is a further perspective view, illustrating in particular the indexing mechanism
  • Figure 8 is a further perspective view, illustrating in particular the indexing platform and the drive portion of the indexing mechanism
  • Figure 9 is a further perspective view of the Indexing platform, illustrating in particular a biasing means for biasihg the sensor device into the respective indexing positions;
  • Figure 10 is a further view of the indexing platform illustrating the biasing means; -
  • Figures 1 1 , 12 and 13 are a series of views illustrating the indexing operation
  • Figure 14 is a schematic plan view of the indexing platform, a sensor device rotatably supported by the platform and a flexible connecting cable extending between the sensor device and the platform to provide electrical connectivity therebetween, with the sensor device shown in a first indexed position; ⁇ 3 ⁇ 4 " , ' . ⁇ - . . .
  • Figure 15 is a view similar to Figure 14, except that the sensor device is shown in a second indexed position;
  • Figure 16 is a sectional iew further illustrating the indexing platform, the sensor device, and the flexible connecting cable extending between the sensor device and the platform;
  • Figure 17 is a perspective view illustrating the indexing platform, the sensor device, and the flexible connecting cable extending between the sensor device and the platform;
  • Figure 18 is a schematic side view of the electrical connection according to the embodiment comprising a flexible connecting cable extending from the platform to provide electrical connectivity with electrical circuitry elsewhere within the tool, with the indexing platform shown in one rotational position;
  • Figure 19 is a view similar to Figure 18, except that the indexing platform is shown in another rotational position;
  • Figure 20 is a perspective view of the down hole surveying tool, illustrating in particular the electrical connection according to the embodiment
  • Figure 21 is a schematic view of an optical alignment system for sensing alignment between drive portion and the driven portion of the indexing mechanism, the driven portion, which is mounted on the indexing platform, being shown in a first indexed position;
  • Figure 22 is a view similar to Figure 21 , except that the driven portion is shown in a second indexed position;
  • Figure 23 is a sectional view of the indexing platform, illustrating in particular the driven portion and that part of the optical alignment system provided thereon;
  • Figure 24 is a perspective view of part of the base of the down hole surveying tool, illustrating in particular the drive portion and that part of the optical alignment system provided thereon;
  • Figure 25 is a schematic view of a composite sensor device used in the down hole surveying tool.
  • Figure 26 is a sectional perspective view of the indexing platform, illustrating in particular the composite sensor device supported therein.
  • a down hole surveying system tool 10 for directional surveying of boreholes The down hole surveying system 10 is configured as a tool which, for convenience, is also denoted by the same reference numeral 10.
  • the tool 10 incorporates a translating electrical connection according to the embodiment, as will be described in detail later with particular reference to Figures 18, 19 and 20.
  • the tool 10 comprises a body 11 which is sized and shaped for movement along a borehole in down hole surveying applications where the maximum passage diameter is typically about 45mm.
  • the body 11 accommodates a single mechanical gyroscope 13 and a single accelerometer 15.
  • the gyroscope 13 and accelerometer 15 are rigidly fixed with respect to each other to provide a sensor package which will hereinafter be referred to as a composite sensor device 17.
  • the gyroscope 13 is a two-axis gyroscope and the accelerometer 15 is a two-axis accelerometer.
  • Other configurations within the sensor package are, of course, possible.
  • the two sensitive axes for the gyroscope 13 are identified in Figure 25 by reference numerals 13a and 3b.
  • the two sensitive axes for the accelerometer 15 are identified in Figure 25 by reference numerals 15a and 15b.
  • the tool 10 is configured for selectively rotating the sensor device 17 about first and second mutually perpendicular axes 1 , 2, which for convenience will be referred to pitch and yaw axes respectively.
  • the first and second axes 1, 2 are shown in Figure 2.
  • the body 11 has a longitudinal axis 3 about which it can roll, which will be referred to as the roll axis.
  • the roll axis 3 When the tool 0 is down the borehole, the roll axis 3 is aligned with the longitudinal extent of the adjacent section: of the borehole in which the tool 10 is located at any particular time.
  • the yaw axis 2 is perpendicular to the sensitive axes of the two-axis gyroscope 13 and the two-axis accelerometer 5.
  • Rotation about the pitch and roll axes 1 , 3 allow the respective planes of the sensitive axes of the gyroscope 13 and accelerometer 15 to be aligned as required.
  • the gyroscope 13 and accelerometer 15 are required to be moved into sensing positions in which their respective sensitive axes occupy horizontal planes.
  • Rotation about the yaw axis 2 allows indexation of the gyroscope 13 and the accelerometer 15 through various indexing positions, with a consequent reduction or cancellation of systematic errors in both devices.
  • the sensor device 17 is selectively rotatable about the yaw axis 2 between various indexing positions, as will be explained in more detail later.
  • the sensor device 17 is rotatable about the yaw axis 2 between two indexing positions which are 180 degrees apart.
  • a drive mechanism is provided for varying the roll angle of the housing 29 within the borehole; that is, for rotating the housing 29 about the roll axis 3.
  • the body 11 comprises a base 23, two side members 25 and a cover 27 forming a housing 29.
  • the cover 27 is shown partly cut-away in Figure 1 , and the two side members 25 and cover 27 are removed from Figure 2 to reveal internal parts.
  • the sensor device 17 is supported in a rotary mount 31 accommodated within the housing 29.
  • the rotary mount 31 is configured as spherical indexing platform 33 in which the sensor device 17 is supported for rotation about the yaw axis 2.
  • the yaw axis 2 defines an indexing axis 4 about which the sensor device 17 can be indexed, as will be explained later.
  • the various sensitive axes of the gyroscope 13 and accelerometer 15 are substantially perpendicular to the indexing axis 4; as shown in Figure 25.
  • the indexing platform 33 comprises a hollow body 35 in which the sensor device 17 is rotatably supported, as best seen in Figure 16.
  • the gyroscope 13 is rotatably supported in a pair of pre-loaded bearings 37 located between the gyroscope 13 and the hollow body 35.
  • the indexing platform 33 is supported within the housing 29 for rotation about the pitch axis 1 which is transverse to the indexing axis 4.
  • the indexing platform 33 has two stub axles 41 having axes which cooperate to provide the pitch axis 1.
  • the stub axles 41 are rotatably supported in bearings 43 mounted in the side members 25.
  • a pitch drive mechanism 51 is provided for selectively rotating the indexing platform 33 about the pitch axis 1. This allows the sensor device 17 to be rotated into any selected plane about the pitch axis 1 for sensing purposes.
  • the pitch drive mechanism 51 comprises a pitch drive motor 53 d riving ly coupled to the indexing platform 33.
  • the pitch drive motor 53 is drivingly coupled to th indexing platform 33 through a drive transmission 56 comprising a ring gear 57 mounted on the indexing platform 33 coincidently with the pitch axis 1.
  • the drive transmission 56 further comprises a drive shaft (not shown) and a drive pinion 61 which is rigidly mounted on the drive shaft and which is in meshing engagement with the ring gear 57.
  • An indexing mechanism 70 is provided for selectively indexing the sensor device 17 about the indexing axis 4.
  • the sensor device 17 is rotatable about the indexing axis 4 between two indexing positions which are 180 degrees apart.
  • the indexing mechanism 70 comprises a drive portion 71 and a driven portion 72 adapted for selective interaction to impart indexing motion to the sensor device
  • the driven portion 72 comprises an indexing head 73 rotatably mounted on the indexing platform 33 and connected to the sensor device 17.
  • the indexing head 73 comprises an indexing plate 75 configured to define a cam profile 77 presenting a cam face 79.
  • the cam profile 77 is configured to define a recess 81 and two lobes 83 on opposed sides of the recess.
  • the drive portion 71 comprises a drive element 85 adapted to impart rotation to the indexing plate 75.
  • the drive element 85 is mounted eccentrically for rotation about a drive axis 86.
  • the drive element 85 comprises a drive pin 87 provided at one end of a drive shaft 89 having an axis of rotation corresponding to the drive axis 86.
  • the drive pin 87 is configured as a roller pin.
  • the drive shaft 89 is configured as a crank, with the drive pin 87 offset from the axis of rotation of the drive shaft.
  • the drive portion 71 further comprises an indexing drive motor 93 drivingly coupled to the drive shaft 89 for selectively rotating the drive shaft about the drive axis 86 in either direction.
  • the eccentric drive pin 87 Upon rotation of the drive shaft 89, the eccentric drive pin 87 is caused to move laterally through a circular path about the drive axis 86, the purpose of which will be explained later.
  • the drive pin 87 has a "parked" position which it occupies when not in operation. The drive pin is shown in the "parked" position in Figures 5 and 6.
  • the indexing plate 75 and the drive pin 87 are adapted to cooperate to facilitate indexing of the sensor device 17 about the indexing axis 4 upon actuation of the indexing drive motor 93.
  • Such cooperation involves rotation of the indexing platform 33 about the pitch axis 1, thereby moving the indexing head 73 towards the drive portion 71 into an operative position, as shown in Figures 4 to 7 and Figures 11 to 13.
  • the axis of rotation of the indexing plate 75 (which corresponds to the indexing axis 4) is parallel to the axis of rotation 91 of the drive shaft 89.
  • the indexing action is initiated by interaction between the laterally moving drive pin 87 and the indexing plate 75, and is completed under the influence of an over-centre biasing mechanism 94 as will be described later.
  • the drive pin 87 continues to move through the circular path and ultimatel returns to the "parked" position, awaiting the next indexing action.
  • the pitch drive mechanism 51 can be actuated to rotate the indexing; platform 33 about the pitch axis 1 and restore the sensor device to its original; positipri to continue sensing in the correct plane.
  • the direction of indexing is, of course, controlled by the direction of rotation of the drive shaft 89 under the influence of the indexing drive motor 93.
  • The. over-centre biasing mechanism 94 which is shown in Figures 9 and 10, is operable to bias the sensor device 17 into the respective indexing positions.
  • the over-centre biasing mechanism 94 comprises a bistable spring mechanism 95 which can pass through an over-centre position to bias the sensor device 17 into the respective indexing position.
  • the bistable spring mechanism 95 is operably coupled to the sensor device 17 and is located on the indexing platform 33 in opposed relation to the indexing head 73.
  • the bistable spring mechanism 95 comprises a spring 96, and an end plate 97 rotatable in unison with the sensor device 17, One end of the spring 96 is connected to an eccentric pin 98 on the end plate 97 and the other end of the spring 96 is connected to fixed pin 99 mounted on a part of the hollow body 35 in which the sensor device 17 is rotatably supported.
  • a limit mechanism 104 is provided. for limiting the extent of rotation of the sensor device 17 to the two indexing positions, 180 degrees apart.
  • the spring 96 initially expands during movement away from the one indexing position until reaching the over-centre position and then contacts during movement towards the other indexing position after passing through the over-centre position. In this way, the bistable spring mechanism 95 functions to bias the sensor device 17 into the respective indexing position.
  • indexing platform 33 It is necessary to align the indexing platform 33 with respect to the drive pin 87 prior to actuation of the indexing mechanism 71. Specifically, it is necessary to align the pitch of the indexing platform 33 prior to indexing so that the indexing plate 75 is presented correctly to the drive pin 87.
  • An optical alignment system 130 is provided for this purpose, as will be described in detail later.
  • the sensor device 17 is rotatable within the indexing platform 33 between the indexing positions. There is a need to establish an electrical connection between the sensor device 17 and the indexing platform 33 accommodating relative movement therebetween as the sensor device 17 indexes.
  • a flexible connecting cable 100 extends between the sensor device 17 and the indexing platform 33, with one end section 01 of the cable 100 connected to the sensor device 17, the other end section 102 connected to the indexing platform 33 and the intermediate section 103 coiled about the indexing axis 4 .
  • the cable 100 is accommodated in the space 105 between the sensor device 17 and the indexing platform 33, as best seen in Figures 14 to 7.
  • the intermediate section 103 is coiled several times to accommodate the relative rotational movement without adversely stressing the cable 100 and affecting its service life.
  • the cable 100 comprises a flat multi-core cable to provide a compact arrangement.
  • the translating electrical connection comprises a flexible connecting cable 110 extends between the indexing platform 33 and the electronic circuitry (hot shown), with one end section 111 of the cable 110 connected to the indexing platform 33, the other end section 112 connected to the electronic circuitry, and the intermediate section 1 3 configured as a loop 115, as shown in Figures 18, 19 and 20.
  • the cable 110 comprises a flat multi-core cable.
  • the loop 1 5 is accommodated in a cable receptacle 117 having two opposed sides 118 and an open end 119 through which the cable extends.
  • the loop 115 comprises two straight sections 121, 122 and a turn section 123 extending between the two straight sections.
  • the two straightsections 121, 122 are constrained and guided by the sides 118 of the cable receptacle 117,. with straight section 121 being adapted to undergo translation motion, sliding along the adjacent side 11 * 8 of the cable receptacle 117 as the indexing platform 33 rotates. This accommodates relative movement between the indexing platform 33 and the electronic circuitry.
  • the turn section 123 rolls within the cable receptacle 117 in unison with the translating straight section 121.
  • the portions of the cable 110 constituting the straight sections 121, 122 and the turn section of course varies as the straight section translates and the turn section 23 rolls.
  • Such an arrangement provides a simple yet highly effective electrical connection between connectivity between the indexing platform 33 and the base 23, which is compact and which obviates the need for a conventional slip ring assembly for electrical connectivity.
  • the loop 115 preferably has a relatively large radius of curvature to avoid adversely stressing the cable 110 and affecting its service life.
  • it is necessary to align the indexing platform 33 prior to actuation of the indexing mechanism 70 Specifically, it is necessary to align the pitch of the indexing platform 33 prior to indexing so that the indexing plate 75 is presented correctly to the drive pin 87.
  • the optical alignment system 130 is operable to sense correct alignment between the drive and driven portions 71 , 72 for operative engagement therebetween, whereby the driven portion 72 can receive drive from the drive portion 71 to cause indexing of the sensor device about the indexing axis 4
  • the optical alignment system 130 comprises a first optical signal transmitter 131 and a first optical signal receiver 133 which cooperate to confirm that alignment is correct.
  • the first optical signal transmitter 131 is adapted to generate and project a modulated beam of light from the indexing platform 33 in a direction perpendicular to the surface of the indexing plate 75 and parallel to the indexing axis 4 .
  • the first optical signal transmitter 131 comprises a central aperture 137 in the indexing plate 75 and an optical emitting device (not shown) located behind the aperture 137 for emitting the modulated beam of light.
  • the first optical signal receiver 133 comprises a corresponding aperture 141 and optical detector 143 mounted externally of the , indexing platform 33; typically on the base 23, in such a way that the apertures 137, 141 align and the modulated beam is detected when the indexing plate 75 is in the correct position.
  • the optical alignment system 130 is configured to also detect that the sensor device 17 has indexed correctly into the desired indexing position. As previously mentioned, there are two indexing positions for the sensor device 17, with the two indexing positions being 180 degrees apart.
  • the optical alignment system 130 further comprises a second optical signal transmitter 132 offset from the first optical signal transmitter 131.
  • the second optical signal transmitter 32 comprises a second aperture 138 in the indexing plate 75 and an optical emitting device (not shown) located behind the aperture 138 for emitting the modulated beam of light.
  • the optical alignment system 130 further one or more further optical signal receivers134 offset from the first optical signal receiver 133.
  • the further optical signal receivers 134a comprises a corresponding aperture 142a and optical detector I44a.
  • the further optical signal receivers134b comprises a corresponding aperture 142b and optical detector 144b.
  • the first optical signal transmitter 131 and a first optical signal receiver 133 cooperate to provide confirmation of alignment of the pitch of the indexing platform 33 prior to indexing so that the indexing plate 75 is presented correctly to the drive pin 87.
  • the second optical: signal transmitter 132 cooperates with the further optical signal receivers 134 to provide confirmation that the sensor device 17 has indexed correctly into the desired indexing position.
  • further optical signal receiver 134a functions to monitor one indexing position
  • further optical signal receiver 134b functions to monitor the other indexing position.
  • Figure 21 illustrates the arrangement Where the sensor device 17 is in the first indexing position, with second optical signal transmitter 132 cooperating with the further optical signal receivers 134a to provide confirmation that the sensor device17 has indexed correctly into the first indexing position.
  • Figure 22 illustrates the arrangement where the sensor device 17 is in the second indexing position, with second optical signal transmitter 132 cooperating with the further optical signal receivers 134b to provide confirmation that the sensor device 17 has indexed correctly into the second indexing position.
  • the gyroscope 13 and the accelerometer 15 are rigidly connected together, they undergo indexing in unison. In this way, the sensitive axes of the gyroscope 13 and the accelerometer 15 can be aligned to cancel systematic errors.
  • the tool 10 In performing a borehole surveying operation, the tool 10 is moved along the borehole, typically suspended from a wire line. At. each location where a survey measurement is required, the tool 10 is stopped and then activated, and the survey process initiated.
  • the survey process involves changing the roll angle of the housing 29, and then rotating the indexing platform 33 about the pitch axis 1 using the pitch drive mechanism 51, to move the respective planes of the sensitive axes of the gyroscope 13 and accelerometer 15 as required.
  • the sensitive axes are moved into positions where they are aligned with respective horizontal planes.
  • the cable 110 moves to accommodate relative movement between the indexing platform 33 and the electronic circuitry mounted on the base 23, thereby maintaining electrical connection between connectivity between the indexing platform 33 and the electronic circuitry, as previously described.
  • the sensitive axes of the gyroscope 13 and the accelerometer 15 are required to be exactly level within respective horizontal planes.
  • a first measurement, or a set of first measurements can then be taken.
  • the first and second measurements are then processed in known manner to obtain a resultant measurement from which systematic errors have been reduced or cancelled.
  • the optical alignment system 130 is used to ensure alignment of the pitch of the indexing platform 33 with respect to the drive pin 87, prior to operation of the indexing drive moto 93, as previously described.
  • the pitch drive mechanism 51 can be actuated to rotate the indexing platform 33 about the pitch axis 1 and restore the sensor device to its earlier position at which the second measurement, or set of second measurements, can then be taken.
  • the tool 10 can be deactivated and then moved to the next position within the borehole at which a further survey. measurement is to be taken; When at the next position, the tool 10 is activated and the survey process initiated, as described before.
  • the sensor device 17 comprises the gyroscope 13 and the accelerometer 15.
  • the indexing process when applied to the accelerometer, has the beneficial effect of cancelling its systematic errors, thereby allowing a low performance device to level the gyroscope sensing plane to a degree otherwise only achievable using a more capable and expensive accelerometer. Furthermore, the indexing process has the additional benefit of eliminating any errors in the alignment of the sensing axes between the gyroscope and the accelerometer.
  • the accelerometer may be omitted, in which case the sensor device 17 may comprise only the gyroscope 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Geophysics (AREA)
  • Gyroscopes (AREA)

Abstract

L'invention porte sur un outil de relevé de fond de trou (10) pour un relevé directionnel de trous de forage. L'outil (10) comprend un corps (11) qui reçoit un dispositif de capteur (17). Le dispositif de capteur (17) est supporté dans une monture rotative (31) pour une rotation autour d'un axe d'indexage (4). Le dispositif de capteur (17) peut être indexé autour de l'axe d'indexage entre deux positions d'indexage, qui sont éloignées l'une de l'autre de 180 degrés. Un mécanisme d'indexage (70) est disposé pour indexer de façon sélective le dispositif de capteur (17) autour de l'axe indexage (4). Le mécanisme d'indexage (70) comprend une partie d'entraînement (71) et une partie entraînée (72) adaptée pour une interaction sélective afin de communiquer un mouvement d'indexage au dispositif de capteur (17). La partie entraînée (72) est mobile de façon a venir en prise et à quitter sa prise avec la partie d'entraînement (71) lors d'une rotation de la monture rotative (31) autour d'un axe de tangage (1) grâce à un mécanisme d'entraînement de tangage (51). L'invention porte également sur une connexion électrique à translation, laquelle connexion vise à produire une connectivité électrique entre la monture rotative (31) et une base (23) qui fait partie du corps (11) et qui reçoit des circuits électroniques pour l'outil de relevé (10). La connexion électrique à translation comprend un câble de connexion souple (110) s'étendant entre la monture rotative (31) et les circuits électroniques, une section d'extrémité (111) du câble (110) étant connectée à la monture rotative (31), l'autre section d'extrémité (112) étant connectée aux circuits électroniques, et la section intermédiaire (113) étant configurée sous la forme d'une boucle (115). La boucle (115) est reçue dans un réceptacle de câble (117), et est adaptée à subir une translation afin de compenser un mouvement relatif entre la monture rotative (31) et les circuits électroniques.
PCT/AU2011/000629 2010-05-25 2011-05-25 Connexion électrique à translation WO2011146987A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2010902278 2010-05-25
AU2010902278A AU2010902278A0 (en) 2010-05-25 Translating Electrical Connection

Publications (1)

Publication Number Publication Date
WO2011146987A1 true WO2011146987A1 (fr) 2011-12-01

Family

ID=45003141

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2011/000629 WO2011146987A1 (fr) 2010-05-25 2011-05-25 Connexion électrique à translation

Country Status (1)

Country Link
WO (1) WO2011146987A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2313393A (en) * 1996-05-24 1997-11-26 Applied Tech Ass Downhole assembly comprising a bilateral electrical path
GB2370645B (en) * 2000-08-29 2003-05-21 Baker Hughes Inc Measurement-while -drilling assembly using gyroscopic devices and methods of bias removal
GB2398308B (en) * 2003-02-11 2007-09-19 Schlumberger Holdings Apparatus for moving a downhole tool for down a wellbore

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2313393A (en) * 1996-05-24 1997-11-26 Applied Tech Ass Downhole assembly comprising a bilateral electrical path
GB2370645B (en) * 2000-08-29 2003-05-21 Baker Hughes Inc Measurement-while -drilling assembly using gyroscopic devices and methods of bias removal
GB2398308B (en) * 2003-02-11 2007-09-19 Schlumberger Holdings Apparatus for moving a downhole tool for down a wellbore

Similar Documents

Publication Publication Date Title
US20130125642A1 (en) Sensor device for a down hole surveying tool
AU2011257897B2 (en) Down hole surveying tool
CN103221776B (zh) 6方向指向装置
US4935883A (en) Apparatus and method for leveling a gravity measurement device
EP2694914B1 (fr) Procédé et appareil de détermination d'orientation utilisant une pluralité de capteurs de vitesse angulaire et d'accéléromètres
US8061047B2 (en) Active positioning of downhole devices using spherical motors
RU2011123991A (ru) Внутрискважинная калибровка инструмента при проведении изысканий пластов
CA2691034A1 (fr) Reduction des erreurs possibles apportees aux mesures gyroscopiques d'un systeme de leve de puits de forage
WO2011146988A1 (fr) Connexion électrique rotative
GB2027904A (en) Determining bore-hole orientation
WO2011146987A1 (fr) Connexion électrique à translation
AU2020100412A4 (en) Orientation Apparatus For Drilling Machinery Method For Orientation Of A Drilling Machinery Drilling Element
WO2011146989A1 (fr) Système d'alignement
JP3852592B2 (ja) ジャイロ装置及び掘削用ジャイロ装置の使用方法
CA2605199A1 (fr) Dispositif de mesure
US4437243A (en) Gyroscopic instrument
CN114111753A (zh) 一种光纤陀螺寻北仪
US11131425B1 (en) Three axis stabilization platform
JP6830375B2 (ja) ジンバル装置、姿勢検出装置、測量装置、測量用ポール、及び飛行移動体
CN111044982B (zh) 一种雷达方位定位的方法
RU131414U1 (ru) Малогабаритный гироскопический инклинометр
Zhang ISS SGANT Group Level Offloading Test Mechanism

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11785914

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11785914

Country of ref document: EP

Kind code of ref document: A1