WO2000014500A1 - Transducteur de pression et de temperature - Google Patents

Transducteur de pression et de temperature Download PDF

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Publication number
WO2000014500A1
WO2000014500A1 PCT/IB1998/001397 IB9801397W WO0014500A1 WO 2000014500 A1 WO2000014500 A1 WO 2000014500A1 IB 9801397 W IB9801397 W IB 9801397W WO 0014500 A1 WO0014500 A1 WO 0014500A1
Authority
WO
WIPO (PCT)
Prior art keywords
resonator
transducer
housing
connecting regions
pressure
Prior art date
Application number
PCT/IB1998/001397
Other languages
English (en)
Inventor
Noriyuki Matsumoto
Yasuhiro Oohashi
Masaru Niwa
Koreyuki Nagai
Yukio Sudo
Masaki Miyashita
Bikash Kumar Sinha
Original Assignee
Schlumberger Limited
Schlumberger Technology B.V.
Schlumberger Surenco S.A.
Petroleum Research And Development N.V.
Schlumberger Canada Limited
Schlumberger Overseas S.A.
Services Petroliers Schlumberger
Schlumberger Holdings Limited
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 Schlumberger Limited, Schlumberger Technology B.V., Schlumberger Surenco S.A., Petroleum Research And Development N.V., Schlumberger Canada Limited, Schlumberger Overseas S.A., Services Petroliers Schlumberger, Schlumberger Holdings Limited filed Critical Schlumberger Limited
Priority to PCT/IB1998/001397 priority Critical patent/WO2000014500A1/fr
Priority to AU88193/98A priority patent/AU8819398A/en
Publication of WO2000014500A1 publication Critical patent/WO2000014500A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0001—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
    • G01L9/0008—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using vibrations
    • G01L9/0022—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using vibrations of a piezoelectric element
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/003—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using pyroelectric elements

Definitions

  • the present invention relates to a pressure and temperature transducer, and in particular to a piezoelectric, dual mode transducer suitable for use in a borehole environment.
  • Piezoelectric pressure and temperature transducers have been known for some time. Such transducers typically comprise a crystal resonator located inside a housing structure. Electrodes are placed on opposite sides of the resonator to provide a vibration-exciting field in the resonator. Environmental pressure and temperature are transmitted to the resonator via the housing and the stresses in the resonator alter the vibrational characteristics of the resonator, this alteration being sensed and used to interpret the pressure and/or temperature.
  • US 3,617,780 describes on form of such a transducer which comprises a unitary piezoelectric crystal resonator and housing structure in which the resonator is positioned on a median (radial) plane of the cylindrical housing.
  • Crystal end caps are located at either end of the housing to complete the structure of the transducer. Since the vibration of the resonator is affected by both temperature and pressure, such devices can be difficult to use in environments where both vary in an uncontrolled manner. Such devices are known as single mode transducers.
  • Pressure and temperature transducers such as these find uses in borehole measurement tools such as are used in oil or gas wells.
  • One example is the MDT Modular Formation Dynamics Tester of Schlumberger.
  • One characteristic of oil and gas wells is that often relatively high temperatures and pressures are encountered. Also, the size of the tools is limited and it is important that the pressure and temperature measurement is relatively quick in order to allow fast measurements along the whole length of the well.
  • a transducer comprises a tubular housing the outer part of which is to be subjected to ambient pressure, a resonator located within the housing and end caps closing the ends of the housing; and is characterised in that the resonator is located in a radial plane with respect to the housing and is connected to the outer part of the housing by two separate connecting regions by which the ambient pressure applied to the outer part of the housing is transmitted to the resonator.
  • the connecting regions are positioned on opposite sides of the resonator such that there are substantially equal slots formed between the resonator and the outer part of the housing. It will be appreciated that where there is no connecting region between the resonator and the outer part of the housing, pressure applied to the housing will not be transmitted to that part of the resonator.
  • the resonator will therefore be subject to an anisotropic stress, preferably such that maximum and minimum stress axes are ortho-ronal to each other.
  • the resonator is typically circular in shape and, as is common in the art, formed in a unitary fashion with the housing.
  • the shape of the resonator can be chosen to suit requirements and may be formed separately from the housing.
  • the number, position, size and shape of the connecting regions is chosen so as to maximise stress contrast between orthogonal transverse axes of the resonator and hence maximise deformation in one direction and minimise deformation in the other direction on application of pressure to the housing.
  • the resonator is contacted only by the connecting regions.
  • the connecting regions are defined by an inner part of the housing which also extends around the resonator such that slots separate the outer part of the housing and the "non-connecting" inner part of the housing.
  • C mode pressure/temperature sensitive mode
  • B mode temperature sensitive mode
  • the shape of the resonator can be selected according to requirements. A bi-convex shape is preferred for good energy trapping but planar orplano-convex section could also be used.
  • the connecting regions can be configured such that the extent and width of the slots formed between the resonator and the housing matches requirements. It may also be appropriate to have more than two connecting portions.
  • Figures 1 shows a prior art transducer
  • Figure 2 shows an axial cross section through a transducer according to the invention
  • Figure 3 shows a plan view of one embodiment of a resonator section
  • Figure 4 shows a cross section on line XX of Figure 3
  • Figure 5 shows a cross section on line YY of Figure 3
  • Figure 6 shows a plan view of another embodiment of a resonator section
  • Figure 7 shows a cross section on line XX of Figure 6
  • Figure 8 shows a cross section on line YY of Figure 6
  • Figure 9 shows a plan view of an end cap section
  • Figure 10 shows across section on line ZZ of Figure 9.
  • FIG. 2 shows a complete transducer 10 according to the invention.
  • This comprises a central resonator section 12 with end cap sections 14, 16.
  • the sections 12, 14, 16 are each formed as a unitary structure from a crystal quartz block using a double rotation cut.
  • the process for forming piezoelectric transducers from such materials is well known in the art.
  • sets of dimensions will be given for two transducers, one of nominal 22mm diameter, the other of nominal 12mm diameter. In all cases the dimension for the 22mm version is given first. These are for illustration only, other dimensions and shaped being possible while still embodying this invention.
  • the transducer 10 has a generally cylindrical shape (diameter 22mm/12mm, height 15mm) with a pair of flats 18 cut along opposite sides (diameter 21mm/l lmm across the pair of flats) and a single flat 19 cut along one side orthogonal to the pair (diameter 21.6mm 11.6 across the single flat).
  • the resonator section 12 ( Figures 3, 4 and 5) comprises a disc with an outer wall section 20 (height 3mm, width 3mm). The centre of the disc is shaped to form a resonator 22 of generally circular shape(diameter l lmm/4mm) and bi-convex cross section (260mm radius of curvature, 1.5mm thickness at centre).
  • the resonator 22 is connected to the wall section 20 by means of connecting sections 24 which are smoothly radiussed (1mm radius)between the periphery of the resonator 22 and the wall 20 and extend for nominally 90° of arc on opposite sides of the resonator 22.
  • Electrodes 28, 29 are deposited on upper and lower surfaces of the resonator and extend to the exterior of the resonator section 12.
  • the end cap sections 14, 16 are symmetrical and have the same circular shape with flats as the resonator section 12.
  • the inner face 30 of each end cap is recessed to a depth of 1mm (radius 13mm/6mm) to correspond to the central region of the resonator section.
  • the end caps 14, 16 are glued to the resonator section 12 so as to define a chamber within which the resonator 22 is located. This chamber is either subjected to high vacuum or filled with inert gas.
  • any stress on the housing due to environmental pressure will be transmitted to the resonator 22 via the connecting sections 24.
  • the deformation on along the axis between the connecting sections will be significantly greater than that along the axis between the slots.
  • the resonator of Figures 6, 7 and 8 differs from that described above in the following manner: instead of having the connecting sections 24 on opposite sides of the resonator 22, the connecting regions are defined by an inner part 124 of the wall section 120 which extends around the resonator 122 and is connected thereto by a connecting web 125 which extends completely around the resonator 122 and is of the same general form as the connection sections 24 shown in Figures 3, 4 and 5. Slots 126 are defined between the inner 124 and outer 123 parts of the wall section 120. Thus, while the resonator 122 is connected to the wall section 120 around its periphery, the slots 126 prevent transmission of stress to the resonator 122 by those parts of the outer wall 123.
  • the inner wall section 124 corresponds in thickness to that outer wall section 123 but this is not essential and the inner w all section 124 can be different if desired.
  • the present invention finds application in pressure and temperature measuring devices, particularly indownhole tools for measuring temperature and pressure in oil and gas wells.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

Cette invention se rapporte à un transducteur sensible à la pression et à la température, qui comprend un logement tubulaire, un résonateur placé dans le logement et des capuchons terminaux fermant les extrémités du logement. Le résonateur est placé dans un plan radial par rapport au logement et il est relié audit logement par deux régions de liaison séparées. Le logement, le résonateur et les régions de liaison sont formés à partir d'un seul bloc de quartz taillé par double rotation. La forme, les dimensions et la position des régions de liaison sont choisies de façon à optimiser les contraintes dans un axe réagissant aux variations de pression et de température, tout en minimisant les contraintes dans un axe réagissant principalement à la pression.
PCT/IB1998/001397 1998-09-09 1998-09-09 Transducteur de pression et de temperature WO2000014500A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IB1998/001397 WO2000014500A1 (fr) 1998-09-09 1998-09-09 Transducteur de pression et de temperature
AU88193/98A AU8819398A (en) 1998-09-09 1998-09-09 Pressure and temperature transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB1998/001397 WO2000014500A1 (fr) 1998-09-09 1998-09-09 Transducteur de pression et de temperature

Publications (1)

Publication Number Publication Date
WO2000014500A1 true WO2000014500A1 (fr) 2000-03-16

Family

ID=11004750

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1998/001397 WO2000014500A1 (fr) 1998-09-09 1998-09-09 Transducteur de pression et de temperature

Country Status (2)

Country Link
AU (1) AU8819398A (fr)
WO (1) WO2000014500A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6455985B1 (en) 1998-11-23 2002-09-24 Schlumberger Technology Corporation Pressure and temperature transducer
US8294332B2 (en) 2007-07-02 2012-10-23 Schlumberger Technology Corporation Pressure transducer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617780A (en) * 1967-10-26 1971-11-02 Hewlett Packard Co Piezoelectric transducer and method for mounting same
GB2125213A (en) * 1982-08-05 1984-02-29 Flopetrol Services Inc Piezoelectric transducer notably for pressure measurement
EP0206888A1 (fr) * 1985-06-14 1986-12-30 ETAT-FRANCAIS représenté par le DELEGUE GENERAL POUR L'ARMEMENT (DPAG) Résonateur piézo-électrique à extremum de sensibilité vis à vis des contraintes extérieures de pression
GB2200992A (en) * 1987-01-30 1988-08-17 Quartztronics Inc Quartz resonator pressure transducer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617780A (en) * 1967-10-26 1971-11-02 Hewlett Packard Co Piezoelectric transducer and method for mounting same
GB2125213A (en) * 1982-08-05 1984-02-29 Flopetrol Services Inc Piezoelectric transducer notably for pressure measurement
EP0206888A1 (fr) * 1985-06-14 1986-12-30 ETAT-FRANCAIS représenté par le DELEGUE GENERAL POUR L'ARMEMENT (DPAG) Résonateur piézo-électrique à extremum de sensibilité vis à vis des contraintes extérieures de pression
GB2200992A (en) * 1987-01-30 1988-08-17 Quartztronics Inc Quartz resonator pressure transducer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6455985B1 (en) 1998-11-23 2002-09-24 Schlumberger Technology Corporation Pressure and temperature transducer
US8294332B2 (en) 2007-07-02 2012-10-23 Schlumberger Technology Corporation Pressure transducer

Also Published As

Publication number Publication date
AU8819398A (en) 2000-03-27

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