CN103089252B - A kind of scale method for three-dimensional induction logging instrument - Google Patents
A kind of scale method for three-dimensional induction logging instrument Download PDFInfo
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- CN103089252B CN103089252B CN201310016456.2A CN201310016456A CN103089252B CN 103089252 B CN103089252 B CN 103089252B CN 201310016456 A CN201310016456 A CN 201310016456A CN 103089252 B CN103089252 B CN 103089252B
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Abstract
The invention provides a kind of scale method for three-dimensional induction logging instrument, the method comprises and is positioned in the graduation apparatus of the solution that given electrical conductivity is housed by three-dimensional induction logging instrument, measures the response signal obtained in graduation apparatus; According to graduation apparatus model parameter, numerical modeling and simulation calculation are carried out to the graduation apparatus entirety that given conductivity solution is housed, obtain equivalent uniform stratigraphic model conductivity parameters, wherein, the response signal of three-dimensional induction logging instrument under this equivalence equably layer model is identical with the response signal of measured three-dimensional induction logging instrument in the graduation apparatus of solution that given electrical conductivity is housed; According to measured response signal and the equivalent uniform stratigraphic model conductivity parameters obtained, set up response signal and the corresponding relation equably between layer model parameter.Scale method of the present invention can be carried out comparatively easily and carry out scale to the response of three-dimensional induction logging instrument, can ensure higher precision again simultaneously.
Description
Technical field
The present invention relates to induction logging technical field, more specifically, relate to a kind of scale method for three-dimensional induction logging instrument.
Background technology
In well logging, along with exploitation that is more complicated, more subtle pool, the needs that people understand oil and gas reservoir detailed construction are also more and more urgent, thus have higher requirement to well logging.Induction logging is as a kind of important method in well logging, and its logger and stratigraphic model are also from simply moving towards complicated.The frequency domain of instrument is from single-frequency to multifrequency, from unicoil, spatial domain senses that multi-coil is responded to, and polarizing field is also from single direction polarization to the polarization of three orthogonal directions.
According to estimates, the oil gas of about 30% is present in thin sand-mud interbed reservoir in the world.In the thin mutual reservoir of the husky mud stone of lamination, usual macroscopical resistivity shows as uniaxial anisotropy, the resistivity response that traditional induction logging instrument records mainly reflects the horizontal resistivity on stratum, what thin sand-mud interbed horizontal resistivity mainly reflected is low-resistance mud stone, the water saturation calculated thus is higher, thus may occur estimating the even leakage of underestimating of oil-gas Layer.How correctly to evaluate the development that this kind of reservoir facilitates multicomponent induction logging tool device, the coil array of this kind of new instrument adds transverse coil system (X and Y-direction magnetic dipole) on the basis of the axial coil array (Z-direction magnetic dipole) of routine, so the electrical conductivity that three-dimensional induction logging can record horizontal direction in theory can measure again the electrical conductivity of vertical direction, thus evaluate petrophysical property more accurately, contribute to excavating peupendicular hole to greatest extent, low-resistivity in inclined shaft and horizontal well, low contrast, the production capacity of argillaceous sandstone produce oil gas-bearing formation, thus obtain maximum economic benefit for oil company, and be regarded as the frontline technology of current oil well logging, be subject to great attention.
An important step is had in the design of three-dimensional induction logging instrument, exactly scale is carried out to the response of instrument, scale has two objects: one has been voltage signal and the corresponding relation of apparent conductivity (apparent conductivity becomes reciprocal relation with apparent resistivity), and two is the impacts eliminating sonde error and electronic circuit error.
More satisfactory scale environment is several infinite homogeneous mediums with different electrical conductivity, namely so-called entity scale model is set up to carry out one-level scale, because the space exploration scope of induction log tool is large, one-level scale physical model is too expensive, technical difficulty is high, so up to this point not yet see the primary calibration standard for induction logging.Induction logging analog scaling device, namely calibration loop making and use all very convenient, be also widely used in practice, but due to its precision poor, generally as the three-stage graduation of field-checking.
Summary of the invention
For solving technological deficiency described above, the invention provides a kind of scale method for three-dimensional induction logging instrument, its object is to, can carry out comparatively easily and scale is carried out to the response of induction log tool, higher precision can be ensured again simultaneously.
For achieving the above object, the present invention takes following technical scheme:
For a scale method for three-dimensional induction logging instrument, comprising:
Three-dimensional induction logging instrument is positioned in the graduation apparatus of the solution that given electrical conductivity is housed, and measures the response signal obtained in described graduation apparatus;
According to graduation apparatus model parameter, numerical modeling and simulation calculation are carried out to the described graduation apparatus entirety that given conductivity solution is housed, obtain equivalent uniform stratigraphic model conductivity parameters, wherein, the response signal of three-dimensional induction logging instrument under this equivalence equably layer model is identical with the response signal of measured three-dimensional induction logging instrument in the graduation apparatus of solution that given electrical conductivity is housed;
According to measured response signal and the equivalent uniform stratigraphic model conductivity parameters obtained, set up response signal and the corresponding relation equably between layer model parameter.
Preferably, Finite Element or finite difference method is used to carry out simulation calculation.
Preferably, three-dimensional induction logging instrument is positioned in the graduation apparatus of the solution that given electrical conductivity is housed, measures the response signal obtained in graduation apparatus, comprising:
Suspension arrangement is used to hang three-dimensional induction logging instrument;
One measure and control device is connected with suspension arrangement, for carrying out observing and controlling to three-dimensional induction logging instrument.
Preferably, suspension arrangement is made up of metal material, and the beeline of suspension arrangement distance scale device is greater than 10 meters.
Preferably, response signal is voltage signal.
The present invention is owing to taking above-described technical scheme, and it comprises following advantage: cost consumption is relatively low, and technical difficulty can be implemented, and precision is higher.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, and exemplary embodiment of the present invention and explanation thereof, for explaining the present invention, are not construed as limiting the invention; In the accompanying drawings:
Fig. 1 is the flow chart of the scale method according to embodiments of the present invention;
Fig. 2 a is the structural representation of the three-dimensional induction logging instrument according to embodiments of the invention;
Fig. 2 b is the structural representation of a transmitting and receiving coil in the three-dimensional induction logging instrument of Fig. 2 a;
Fig. 3 is 21 inches of dispatch coils distance measuring-signals and formation parameter graph of relation when operating frequency 26KHz, well electrical conductivity are 1.0 Siemens;
Fig. 4 is 21 inches of dispatch coils distance measuring-signals and formation parameter graph of relation when operating frequency 26KHz, well electrical conductivity are 0.0 Siemens;
Fig. 5 is 27 inches of dispatch coils distance measuring-signals and formation parameter graph of relation when operating frequency 26KHz, well electrical conductivity are 1.0 Siemens;
Fig. 6 is 27 inches of dispatch coils distance measuring-signals and formation parameter graph of relation when operating frequency 26KHz, well electrical conductivity are 0.0 Siemens.
Detailed description of the invention
In order to make technical scheme of the present invention clearly understand, below in conjunction with the drawings and specific embodiments, the present invention is elaborated further.It should be noted that, when not conflicting, the various modes in the embodiment in the application and embodiment can combine mutually.
A kind of three-dimensional induction logging instrument structure as shown in Figure 2 a, this logging instrument has receiving coil system Rm2 and Rm1 of a transmitting coil (T) and two spacings, spacing is 27 inches and 21 inches respectively, Rm2 is the main receiving coil of 27 inches of spacing coil arrays, Rb2 is the bucking coil of 27 inches of spacing coil arrays, Rm1 is the main receiving coil of 21 inches of spacing coil arrays, and Rb1 is the bucking coil of 21 inches of spacing coil arrays, Rb2 and Rm1 is in same position.Three-dimensional induction coil has the component of X/Y/Z to three directions, and consider the symmetry of X/Y, in order to simplify structure, the transmitting coil of the three-dimensional induction logging instrument in the present invention and receiving coil can be designed to X/Z to two components, and structure as shown in Figure 2 b.In order to simplify, hereinafter, by T-Rm2 (RB2) the dispatch coil group that the spacing that 27 inches of spacings refer in particular to three-dimensional induction logging instrument in Fig. 2 a is 27 inches, be T-Rm1 (Rb1) the dispatch coil group of 21 inches with the spacing that 21 inches of spacings refer in particular to three-dimensional induction logging instrument in Fig. 2 a.
For a scale method for three-dimensional induction logging instrument, as shown in Figure 1, can comprise the steps:
Three-dimensional induction logging instrument is positioned in the graduation apparatus of the solution that given electrical conductivity is housed, and measures the response signal obtained in graduation apparatus;
According to graduation apparatus model parameter, numerical modeling and simulation calculation are carried out to the graduation apparatus entirety that given conductivity solution is housed, obtain equivalent uniform stratigraphic model conductivity parameters, wherein, the response signal of three-dimensional induction logging instrument under this equivalence equably layer model is identical with the response signal of measured three-dimensional induction logging instrument in the graduation apparatus of solution that given electrical conductivity is housed;
According to measured response signal and the equivalent uniform stratigraphic model conductivity parameters obtained, set up response signal and the corresponding relation equably between layer model parameter.
In the implementation process of scale, the electrical conductivity of solution of adjustment graduation apparatus, from low to high, choose but be not limited to 0.01 Siemens every meter to 2 Siemens every meter of interval, choose 3 to 5 points, repetition said method operates.By said method, complete the scale to three-dimensional induction logging instrument.
Alternatively, Finite Element or finite difference method can be used to carry out simulation calculation, other simulation calculation algorithm can also be used.
Alternatively, three-dimensional induction logging instrument is positioned in the graduation apparatus of the solution that given electrical conductivity is housed, measures the response signal obtained in graduation apparatus, can comprise:
Suspension arrangement can be used to hang three-dimensional induction logging instrument;
One measure and control device can be connected with suspension arrangement, for carrying out observing and controlling to three-dimensional induction logging instrument.
Alternatively, suspension arrangement can be made up of metal material or nonmetals, if be made up of metal material, then the beeline of suspension arrangement distance scale device is greater than 10 meters.
Alternatively, response signal can be voltage signal.
In an embodiment of the application, be positioned on ground by the graduation apparatus of finite size, in order to ensure stability and the engineering steadiness of model parameter, ground can be designed to cement floor.Can the solution of the different electrical conductivity of splendid attire inside graduation apparatus, scale is carried out to three-dimensional induction logging instrument.
When concrete scale is implemented, graduation apparatus is positioned on cement floor, well and electrical anisotropy layer is provided with inside graduation apparatus, the vertical resistivity (along well axial direction) of this electrical anisotropy layer and the ratio of horizontal resistivity (perpendicular to well axial plane) are 8, and vertical resistivity value and horizontal resistivity value can change along with the change of the conductivity value of the conductivity solution inside graduation apparatus.Three-dimensional induction logging instrument shown in Fig. 2 a is positioned over inside well, and transmitting coil T is above, and below, transmitting coil T is apart from 7.9 meters, the surface of cement floor for receiving coil.Three-dimensional induction logging instrument passes through from suspension arrangement, such as, on tower crane suspended cable carries out hanging, powering and observing and controlling, cable can folding and unfolding, lift by crane and transfer instrument, tower crane can be metal with nonmetallic material, if metal material, require that the beeline of distance scale device is greater than 10 meters, to reduce the impact of metal pair scale.Measure and control device, such as observing and controlling computer is positioned at inside observing and controlling room, to be connected to carry out observing and controlling by cable with three-dimensional induction logging instrument.Can inside pond the salting liquid of the certain electrical conductivity of pre-coordination, be then injected into inside graduation apparatus by water pump system.
When carrying out scale, on graduation apparatus entirety (comprise electrical anisotropy layer, there is solution and the well of given electrical conductivity) and three-dimensional induction logging instrument carries out overall numerical modeling, and (impact on instrument response of observing and controlling room, tower crane and cable is minimum, negligible, ignore in modeling), adopt Finite Element Method, obtain 4 groups of graduation apparatus conductivity parameters and equivalent uniform formation conductivity parameters relationship curve, see Fig. 3, Fig. 4, Fig. 5, Fig. 6, in curve, abscissa is the electrical conductivity of the solution 1 in graduation apparatus.
Fig. 3 is well electrical conductivity when being 1.0 Siemens, and under operating frequency 26KHz, 21 inches of dispatch coils are apart from measuring-signals and formation parameter relation curve (0.01 ~ 10000 ohm meter).Its physics is containing meaning: as the response as simulation well electrical conductivity of solution A=0.1 equals the response corresponding when not considering that Kelvin effect affects of electrical conductivity B=0.77S/m infinite uniform stratum.Therefore, upper graph gives the corresponding relation on electrical conductivity of solution and infinite uniform stratum.As long as simulation well electrical conductivity of solution is certain, namely find the electrical conductivity on infinite uniform stratum corresponding with it by upper figure.Therefore scale can be carried out to instrument response by simulation well solution.
Similarly, Fig. 4 is well electrical conductivity when being 0.0 Siemens (without solution), and under operating frequency 26KHz, 21 inches of dispatch coils are apart from measuring-signals and formation parameter relation curve (0.01 ~ 10000 ohm meter).Fig. 5 is well electrical conductivity when being 1.0 Siemens, and under operating frequency 26KHz, 27 inches of dispatch coils are apart from measuring-signals and formation parameter relation curve (0.01 ~ 10000 ohm meter).Fig. 6 is well electrical conductivity when being 0.0 Siemens (without solution), and under operating frequency 26KHz, 27 inches of dispatch coils are apart from measuring-signals and formation parameter relation curve (0.01 ~ 10000 ohm meter).
Due to apparent conductivity=voltage/instrumental constant, instrumental constant and instrument design itself relating to parameters, like this, just establish the response signal (can be voltage signal) of measurement and the corresponding relation equably between layer model electrical conductivity, by some typical conductivity solution in graduation apparatus (as 0.002,0.01,0.1,1, test the instrument 10s/m), just establish the response signal (can be voltage signal) of measurement and the corresponding relation equably between layer model electrical conductivity, just complete the scale to instrument.
Application example 1
By the three-dimensional induction logging instrument after said method scale, test at natural lake, test water depth is about 18 meters, water body resistivity 29.6ohm.m (measures with resistivity tester CM-MR-3 and obtains, electrical conductivity and resistivity reciprocal relation each other), because water depth is larger, scope is wider, be similar to infinitely great evenly water body, horizontal resistivity=vertical resistivity.This three-dimensional induction logging instrument is placed horizontally at the depth of water about 9 meters of (the instrument distance water surface and lakebed distance all about 9 meters) to test, 21 inches of spacing Z-direction coils measured resistivity (horizontal resistivity) are 30.03168 ohm meters, relative error 1.458364%, 21 inches of spacing x are 30.55966 ohm meters to coil measured resistivity (vertical resistivity), relative error 3.242108%; 27 inches of spacing Z-direction coils measured resistivity (horizontal resistivity) are 30.18293 ohm meters, relative error 1.96937%, 27 inches of spacing x are 29.81366 ohm meters to coil measured resistivity (vertical resistivity), relative error 0.721827%.
Measurement result shows, scale method of the present invention can carry out effective scale to three-dimensional induction logging instrument, the certainty of measurement of three-dimensional induction logging instrument in even water body after this scale method scale is higher, can measure the resistivity of homogeneous medium more exactly.
The above embodiment is only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention, and those skilled in the art deliberately can carry out various modifications and variations to the present invention and without departing from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these amendment and modification.
Claims (3)
1., for a scale method for three-dimensional induction logging instrument, comprising:
Three-dimensional induction logging instrument is positioned in the graduation apparatus of the solution that given electrical conductivity is housed, measure the response signal obtained in described graduation apparatus, comprise: use suspension arrangement to hang described three-dimensional induction logging instrument, one measure and control device is connected with described suspension arrangement, for carrying out observing and controlling to described three-dimensional induction logging instrument; Described suspension arrangement is made up of metal material, and described suspension arrangement is greater than 10 meters apart from the beeline of described graduation apparatus;
According to graduation apparatus model parameter, numerical modeling and simulation calculation are carried out to the described graduation apparatus entirety that given conductivity solution is housed, obtain equivalent uniform stratigraphic model conductivity parameters, wherein, the response signal of three-dimensional induction logging instrument under this equivalence equably layer model is identical with the response signal of measured three-dimensional induction logging instrument in the graduation apparatus of solution that given electrical conductivity is housed;
According to measured response signal and the equivalent uniform stratigraphic model conductivity parameters obtained, set up response signal and the corresponding relation equably between layer model parameter.
2. method according to claim 1, wherein,
Finite Element or finite difference method is used to carry out simulation calculation.
3. method according to claim 1, wherein,
Described response signal is voltage signal.
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| CN105204073B (en) * | 2015-09-18 | 2017-07-25 | 中南大学 | A kind of tensor apparent conductivity measuring method |
| CN106053944B (en) * | 2016-05-03 | 2019-01-18 | 陕西夸克自控科技有限公司 | A kind of rock resistivity measurement instrument and measurement method |
| CN106990453B (en) * | 2017-04-10 | 2018-11-16 | 中国石油天然气集团公司 | The scale transmission method of litho-density tool replacement radioactive source |
| CN108049865B (en) * | 2017-09-12 | 2021-08-03 | 中国石油天然气集团公司 | Electric field calibration method for induction logging while drilling |
| CN108643895B (en) * | 2018-04-03 | 2022-03-01 | 中国石油天然气股份有限公司 | Resistivity logging response calculation method and device for gradient stratum |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4876511A (en) * | 1988-10-20 | 1989-10-24 | Schlumberger Technology Corporation | Method and apparatus for testing and calibrating an electromagnetic logging tool |
| US5293128A (en) * | 1992-07-02 | 1994-03-08 | Western Atlas International, Inc. | Method and apparatus for calibrating the output measurement of a logging tool as a function of earth formation parameters |
| CN101942987A (en) * | 2010-08-13 | 2011-01-12 | 中国海洋石油总公司 | Simple sonic logger detection, calibration and ruling method |
| CN102003171A (en) * | 2010-11-04 | 2011-04-06 | 中国石油天然气集团公司 | Calibrating device of three-dimensional induction logger |
| CN102536197A (en) * | 2012-01-16 | 2012-07-04 | 中国石油大学(华东) | Multifunctional induction logging simulated experiment teaching system |
| CN102536199A (en) * | 2012-02-16 | 2012-07-04 | 中国石油天然气集团公司 | Controllable source while-drilling nuclear logging tool calibration device and calibration method |
| CN102565875A (en) * | 2011-12-30 | 2012-07-11 | 中国石油天然气集团公司 | Method and device for checking scales of resistivity logging instrument |
| CN102619505A (en) * | 2012-04-25 | 2012-08-01 | 中国电子科技集团公司第二十二研究所 | Ground calibration device of instrument for electromagnetic resistivity logging while drilling |
| CN202611678U (en) * | 2012-03-02 | 2012-12-19 | 中国石油集团长城钻探工程有限公司 | Calibration device of well logging instrument |
-
2013
- 2013-01-16 CN CN201310016456.2A patent/CN103089252B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4876511A (en) * | 1988-10-20 | 1989-10-24 | Schlumberger Technology Corporation | Method and apparatus for testing and calibrating an electromagnetic logging tool |
| US5293128A (en) * | 1992-07-02 | 1994-03-08 | Western Atlas International, Inc. | Method and apparatus for calibrating the output measurement of a logging tool as a function of earth formation parameters |
| CN101942987A (en) * | 2010-08-13 | 2011-01-12 | 中国海洋石油总公司 | Simple sonic logger detection, calibration and ruling method |
| CN102003171A (en) * | 2010-11-04 | 2011-04-06 | 中国石油天然气集团公司 | Calibrating device of three-dimensional induction logger |
| CN102565875A (en) * | 2011-12-30 | 2012-07-11 | 中国石油天然气集团公司 | Method and device for checking scales of resistivity logging instrument |
| CN102536197A (en) * | 2012-01-16 | 2012-07-04 | 中国石油大学(华东) | Multifunctional induction logging simulated experiment teaching system |
| CN102536199A (en) * | 2012-02-16 | 2012-07-04 | 中国石油天然气集团公司 | Controllable source while-drilling nuclear logging tool calibration device and calibration method |
| CN202611678U (en) * | 2012-03-02 | 2012-12-19 | 中国石油集团长城钻探工程有限公司 | Calibration device of well logging instrument |
| CN102619505A (en) * | 2012-04-25 | 2012-08-01 | 中国电子科技集团公司第二十二研究所 | Ground calibration device of instrument for electromagnetic resistivity logging while drilling |
Non-Patent Citations (1)
| Title |
|---|
| 三维感应测井基础理论及实验研究;魏少华;《中国优秀硕士学位论文全文数据库 基础科学辑》;20091115(第11期);第31页第4.1节至第38页第4.3节 * |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: China Oilfield Services Limited Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: China Oilfield Services Limited Patentee before: China National Offshore Oil Corporation |