CN102400679A - Tangential polarization monopole energy converter applicable to multi-level array sound wave well logging - Google Patents
Tangential polarization monopole energy converter applicable to multi-level array sound wave well logging Download PDFInfo
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- CN102400679A CN102400679A CN2010102790995A CN201010279099A CN102400679A CN 102400679 A CN102400679 A CN 102400679A CN 2010102790995 A CN2010102790995 A CN 2010102790995A CN 201010279099 A CN201010279099 A CN 201010279099A CN 102400679 A CN102400679 A CN 102400679A
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Abstract
The invention relates to a tangential polarization monopole energy converter applicable to multi-level array sound wave well logging. The energy converter comprises a binding post (1), an insulator (2), a core shaft (3), an upper end cover (4), a terminal washer (5), an insulation core shaft (6), a lower end cover (8), a nut (9), an electrode lead (10) and a screw (11). The energy converter is characterized by also comprising a spliced ceramic tube (7), wherein the spliced ceramic tube (7) is formed by bonding a plurality of tangential polarization piezoelectric ceramic wafers of which end faces are fan-shaped by using a high-temperature adhesive; silver layers are coated on two inclined edge surfaces of the fan-shaped tangential polarization piezoelectric ceramic wafers; and an outer layer of the spliced ceramic tube (7) is poured by using the high-temperature adhesive and glass fiber in a winding mode. The tangential polarization monopole energy converter has the advantages that: by using a tangential polarization splicing ceramic tube, higher transmission power and transmission efficiency can be obtained at low frequency; receiving sensitivity is improved; and stability and reliability are realized.
Description
Technical field
The present invention relates to the logger technical field, particularly, the present invention relates to a kind of shear-polarization monopole transducer that is used for multistage array sonic log.
Background technology
In recent years, along with going deep into of geology and oil exploration, also increasingly high to the expectation and the requirement of logger, acoustic logging is one of important method of oil well logging.The acoustic logging that adopts at present is to utilize transmitting transducer to send sound wave in the down-hole, in underground medium, propagates, and after the certain hour decay, is accepted transducer and accepts, and through the acoustic signals analysis to decay, judges underground relevant geologic structure.Acoustic wave transducer comprises monopole acoustic wave transducer and dipole acoustic transducer etc., and what the monopole soic wave transmitting energy converter excited mainly is the compressional wave signal, and what the dipole acoustic transmitting transducer excited mainly is the shear wave signal.Usually the acoustic logging instrument that adopts now is the conventional acoustic logging instrument of monopole sound source; Its shortcoming is directly to extract the shear wave parameter; In cased well, the compressional wave parameter also is difficult to obtain; Therefore, seem very weak in the judgement for soft formation parameter very important in oil exploration.In order to overcome the defective of this conventional acoustic logging instrument; Or the dipole acoustic of increasing transducer arranged on original instrument; Shear wave parameter in, the hard formation soft with direct extraction, the tranmitting frequency of original monopole transducer is high, loss is big, sensitivity is low, can't obtain Permeability Parameters accurately but this kind way is confined to; And Permeability Parameters to ask for be the important topic that oil well logging faces all the time, it is accurately asked in that to estimate on oil production rate and the reserves meaning very great.The structure of old conventional instrument also can't realize multiple logging mode in addition.Such as; Cement bond log is a method commonly used in the oil well logging; Mainly be used for measuring the bonding quality of cement grouting behind the oil well setting of casing, this method measuring principle and one pole metering system are similar, but that spacing (distance between transmitter and the receiver) requires is longer; Therefore, changing instrument with regard to needs during the cement bond logging well just can carry out.
In order to launch more low-frequency compressional wave; Reservoir permeability is asked in Stoneley wave speed and decay in the utilization sound acoustic wave train logging; And can realize multiple logging mode, China's invention 03261891.3 has proposed a kind of " multipole array sonic log transducer ", utilizes monopole, dipole and Stoneley wave transducer to form multistage sound source; Can directly measure compressional wave, shear wave, the Stoneley wave parameter on stratum; Both can be each other with reference to checking, also can individual processing, improved the confidence level and the range of application of instrument greatly.What monopole transmitting transducer in this invention and monopole receiving transducer adopted is the piezoelectric ceramic tube of radial polarised, and between wall thickness 1～5mm, the pipe inside and outside wall is silver coated, is used for welding electrode.The transducer receiving sensitivity of this structure is higher; Voltage can compress because the characteristic of piezoelectric ceramics, electrode both sides add in the same way, and adding backward voltage can stretch; The tensile strength of piezoelectric ceramics self is limited; Too high backward voltage can make himself cracking, and this has just determined that the monomer earthenware can't apply too big voltage, also just is difficult to obtain bigger transmitting power.The way of making the monomer earthenware at present is to suppress heavy wall cast stock earlier, passes through the mechanical lapping inside and outside circle then, obtains the earthenware of thin-walled, and earthenware is very easy to break in mechanical processing process, and yield rate is lower, and this has just increased cost of manufacture.Technological requirement is also very strict in the process of radial polarised, and the cracked and defective that causes because of polarization also happens occasionally.Use the making and the use of the transducer of this monomer earthenware also to need exactissima diligentia, installation and transportation are all very inconvenient.In subsurface environment, the reason of Yin Wendu and pressure, earthenware is prone to break.Electrode pad on the inside and outside wall also comes off easily.For bigger transmitting power can be provided; Have higher receiving sensitivity simultaneously, can adopt and cut apart electric pole type annular earthenware and replace the radial polarised piezoelectric ceramic tube, how the technical difficulty of this structure is extraction electrode; Among the United States Patent (USP) NO.3142032; What adopt is metal forming or net, sticks between the electrode of per two amalgamation assemblies splicing, utilizes the part welding electrode that extends out in the sticking seam of metal sandwich.But the equipment complex process, along with increasing of piece, the effective electro-mechanical couple factor of oscillator descends; Metal sandwich is different with the coefficient of thermal expansion of piezoelectric ceramics, therefore is easy to generate stress cracking.China invention CN85201622 has proposed a kind of electrode lead-out mode that does not have metal sandwich; Through the local way extraction electrode that exposes of the silver coating of piezoelectric ceramics being pieced together bar, thereby simplify assembly technology, improved yield rate; Improve electromechanical coupling characteristics, possessed more stable electric property simultaneously.The time ratio that this invention proposes early; This method can only be made the transducer of big (diameter is greater than 30 centimetres) of volume; The transducer of preparation can only be applied in its volume not required the field by this method, so be confined under water low-frequency high-power transmitter, acoustic release instruction sound source and ignite experiment field, ocean such as acoustic apparatus under water.Invention CN85201622 is from the volume size or technical scheme has determined that all its range of application can only be the deep water marine field; And the technical requirements of discontented fully sufficient sound wave well logging transducer; Acoustic logging is as one and diverse field, deep water ocean, and also harsh more to the requirement of transducer, acoustic logging requires size less relatively (in 10 centimetres of the diameters) with transducer; Amount ratio is bigger; Cost requirement is lower, so the present invention prepares the transducer that is applicable to the well logging field upward through further improving in this basis again.
Summary of the invention
The object of the present invention is to provide a kind of shear-polarization monopole transducer that is used for multistage array sonic log, successful solution the problem that the monopole transducer exists in the existing multistage array sonic log.
The shear-polarization monopole transducer that is used for multistage array sonic log that provides of the present invention comprises: prap 1, insulator 2, mandrel 3, upper end cover 4, terminal pad 5, insulation mandrel 6, splicing earthenware 7, bottom end cover 8, nut 9, contact conductor 10, screw 11;
Described transducer comprises that also splicing earthenware 7 is the shear-polarization piezoelectric ceramic piece, and end face is fan-shaped, and is silver coated on two fan-shaped hypotenuse faces; Through the bonding one-tenth annular of high-temp glue; Use high-temp glue and glass fiber to twine cast, radially apply with prestressing force, radially apply with prestressing force at it at it; Under the situation of low frequency large amplitude, be difficult for broken; The electrode of splicing earthenware 7 is to draw through the local mode that exposes of the silver coating of piezoelectric ceramics being pieced together bar.
As a kind of improvement of such scheme, described terminal pad 5, insulation mandrel 6, insulator 2 are for gathering PTFE or other high-temperature insulation materials; Upper end cover 4, bottom end cover 8, mandrel 3, nut 9, screw 11 are stainless steel material.
Another improvement as such scheme is characterized in that, described prap 1 is silver-plated metal material, especially uses the silver-plated material of fine copper.
As another improvement of such scheme, described contact conductor 10 is a high temperature resistant wire, and its skin has the polytetrafluoroethylene (PTFE) bag multiple, and heart yearn is the silver-plated wire of multiply.
As also a kind of improvement of such scheme, described shear-polarization piezoelectric ceramic piece is an exotic material, and its curie point is higher than 375 ℃.
The invention has the advantages that: a kind of shear-polarization monopole transducer that is used for multistage array sonic log provided by the invention, substitute conventional radial polarised earthenware through adopting shear-polarization splicing earthenware, can obtain bigger transmitting power when making low frequency; And emission effciency; Have very high receiving sensitivity simultaneously, to have electric property reliable and stable for this structure transducer simultaneously, the firm difficult drop-off of electrode pads; Earthenware is difficult for broken, characteristics such as high temperature high voltage resistant.
Description of drawings
Fig. 1 transducer sectional drawing of the present invention;
The structure chart of Fig. 2 earthenware of the present invention.
The accompanying drawing sign
1, prap 2, insulator 3, mandrel
4, upper end cover 5, terminal pad 6, insulation mandrel
7, splicing earthenware 8, bottom end cover 9, nut
10, contact conductor 11, screw 12, pottery are pieced together bar
13, extraction electrode
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment, structure of the present invention is carried out further detailed explanation.
As shown in Figure 1, transducer of the present invention comprises: prap 1, insulator 2, mandrel 3, upper end cover 4, terminal pad 5, insulation mandrel 6, splicing earthenware 7, bottom end cover 8, nut 9, contact conductor 10, screw 11; Transducer comprises that also splicing earthenware 7 is the shear-polarization piezoelectric ceramic piece in addition, and end face is fan-shaped, and is silver coated on two fan-shaped hypotenuse faces; Through the bonding one-tenth annular of high-temp glue; Use high-temp glue and glass fiber to twine cast, radially apply with prestressing force, radially apply with prestressing force at it at it; Under the situation of low frequency large amplitude, be difficult for broken; The electrode of splicing earthenware 7 is to draw through the local mode that exposes of the silver coating of piezoelectric ceramics being pieced together bar;
Wherein, splicing earthenware 7 two ends coaxial cooperation terminal pads 5 are installed between upper end cover 4 and the bottom end cover 8; Mandrel 3 one ends have ring-like youngster, are used for and upper end cover 4 coaxial cooperation, and mandrel 3 outer walls are sliding combined with insulation mandrel 6; Realize fixing through screw 11; Mandrel 3 other ends have screw thread, through nut 9, will splice earthenware 7 and be fixed and clamped.Contact conductor 10 passes the through hole on the upper end cover, is separately fixed on the prap 1, and prap 1 is installed on the insulator 2.
The extraction electrode 13 of splicing earthenware 7 as shown in Figure 2 is to draw through the local mode that exposes of the silver coating of piezoelectric ceramics being pieced together bar 12.
It should be noted last that above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although the present invention is specified with reference to embodiment; Those of ordinary skill in the art is to be understood that; Technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. a shear-polarization monopole transducer that is used for multistage array sonic log comprises: prap (1), insulator (2), mandrel (3), upper end cover (4), terminal pad (5), insulation mandrel (6), bottom end cover (8), nut (9), contact conductor (10), screw (11); It is characterized in that this transducer also comprises splicing earthenware (7);
Described splicing earthenware (7) is that fan-shaped shear-polarization piezoelectric ceramic piece forms through high-temp glue is bonding by some end faces; Silver coated on two hypotenuse faces of described fan-shaped shear-polarization piezoelectric ceramic piece, splicing earthenware (7) is outer to be used high-temp glue to twine with glass fiber to pour into a mould.
2. the shear-polarization monopole transducer that is used for multistage array sonic log according to claim 1 is characterized in that, described terminal pad (5), insulation mandrel (6), insulator (2) are processed for high-temperature insulation material, comprise and gather PTFE.
3. the shear-polarization monopole transducer that is used for multistage array sonic log according to claim 1 is characterized in that described prap (1) is silver-plated metal material.
4. the shear-polarization monopole transducer that is used for multistage array sonic log according to claim 1 is characterized in that described contact conductor (10) is a high temperature resistant wire, and its skin has the polytetrafluoroethylene (PTFE) bag multiple, and heart yearn is the silver-plated wire of multiply.
5. the shear-polarization monopole transducer that is used for multistage array sonic log according to claim 1 is characterized in that described shear-polarization piezoelectric ceramic piece is an exotic material, and its curie point is higher than 375 ℃.
6. the shear-polarization monopole transducer that is used for multistage array sonic log according to claim 1 is characterized in that, the electrode of described splicing earthenware (7) is to draw through the local mode that exposes of the silver coating of piezoelectric ceramics being pieced together bar.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010279099.5A CN102400679B (en) | 2010-09-10 | 2010-09-10 | Tangential polarization monopole energy converter applicable to multi-level array sound wave well logging |
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| CN201010279099.5A CN102400679B (en) | 2010-09-10 | 2010-09-10 | Tangential polarization monopole energy converter applicable to multi-level array sound wave well logging |
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| CN102400679A true CN102400679A (en) | 2012-04-04 |
| CN102400679B CN102400679B (en) | 2015-05-13 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104126118A (en) * | 2011-12-22 | 2014-10-29 | 普拉德研究及开发股份有限公司 | Systems and methods for downhole cement evaluation |
| CN104612613A (en) * | 2015-01-28 | 2015-05-13 | 中国科学院声学研究所 | Piezoelectric type vibration device |
| CN107580274A (en) * | 2017-07-20 | 2018-01-12 | 哈尔滨工程大学 | Mosaic bends disk underwater acoustic transducer |
| CN108343427A (en) * | 2018-04-24 | 2018-07-31 | 杭州丰禾石油科技有限公司 | Logging while drilling apparatus mandrel |
| CN111119869A (en) * | 2018-11-01 | 2020-05-08 | 中国石油化工股份有限公司 | Ultrasonic transducer detection device and while-drilling ultrasonic transducer detection method |
| CN112796738A (en) * | 2021-02-04 | 2021-05-14 | 西南石油大学 | Stratum permeability calculation method combining array acoustic logging and conventional logging |
| CN115121467A (en) * | 2022-05-27 | 2022-09-30 | 中国长江三峡集团有限公司福建分公司 | Spliced tangential polarization piezoelectric ceramic tube and single-stage sub-transducer |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104126118A (en) * | 2011-12-22 | 2014-10-29 | 普拉德研究及开发股份有限公司 | Systems and methods for downhole cement evaluation |
| CN104126118B (en) * | 2011-12-22 | 2016-08-24 | 普拉德研究及开发股份有限公司 | System and method for down-hole well cementation agent assessment |
| US9822627B2 (en) | 2011-12-22 | 2017-11-21 | Schlumberger Technology Corporation | Systems and methods for downhole cement evaluation |
| CN104612613A (en) * | 2015-01-28 | 2015-05-13 | 中国科学院声学研究所 | Piezoelectric type vibration device |
| CN107580274A (en) * | 2017-07-20 | 2018-01-12 | 哈尔滨工程大学 | Mosaic bends disk underwater acoustic transducer |
| CN108343427A (en) * | 2018-04-24 | 2018-07-31 | 杭州丰禾石油科技有限公司 | Logging while drilling apparatus mandrel |
| CN111119869A (en) * | 2018-11-01 | 2020-05-08 | 中国石油化工股份有限公司 | Ultrasonic transducer detection device and while-drilling ultrasonic transducer detection method |
| CN112796738A (en) * | 2021-02-04 | 2021-05-14 | 西南石油大学 | Stratum permeability calculation method combining array acoustic logging and conventional logging |
| CN115121467A (en) * | 2022-05-27 | 2022-09-30 | 中国长江三峡集团有限公司福建分公司 | Spliced tangential polarization piezoelectric ceramic tube and single-stage sub-transducer |
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