CN112034522B - Method for measuring stratum resistivity by six subarray coils - Google Patents
Method for measuring stratum resistivity by six subarray coils Download PDFInfo
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- CN112034522B CN112034522B CN202010850715.1A CN202010850715A CN112034522B CN 112034522 B CN112034522 B CN 112034522B CN 202010850715 A CN202010850715 A CN 202010850715A CN 112034522 B CN112034522 B CN 112034522B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/26—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device
- G01V3/28—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device using induction coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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Abstract
The invention discloses a method for measuring stratum resistivity by a six-subarray coil system, which comprises the steps of calculating and drawing a relation linked list of the original apparent conductivity ratio of subarrays 6A6B farthest from a transmitting coil to adjacent subarrays 5A5B and the original apparent conductivity of subarrays 5A5B by using a traditional seven-subarray coil system, measuring by using a six-subarray coil system induction logging instrument to obtain the apparent conductivity of the farthest subarray 5A5B, inquiring on the relation linked list to obtain conversion coefficients of the subarray 5A5B and the subarray 6A6B, and multiplying the original apparent conductivity information of the subarray 6A6B farthest from the traditional coil system by the conversion coefficient, wherein the subarray 5A5B is obtained by measuring by the six-subarray coil system. The method reduces a pair of receiving coils, optimizes the structural length of the system, makes the whole instrument compact in structure, is convenient to operate, and enhances the tensile strength and the compressive strength of the measuring instrument.
Description
Technical Field
The invention belongs to the technical field of geophysical well logging, relates to an induction well logging technology, and particularly relates to a method for measuring stratum resistivity by a six-subarray coil system.
Background
The induction logging instrument is a logging instrument for measuring the formation resistivity by utilizing the electromagnetic induction principle. After the transmitting coil generates an alternating electromagnetic field in the stratum medium, induced current is generated in the stratum unit ring taking the shaft as the axis, and the magnitude of the induced current is in direct proportion to the conductivity of the stratum unit ring. The electromagnetic field generated by these current loops is called the secondary field. The secondary field generates induced electromotive force in the receiving coil, and the magnitude of the induced electromotive force reflects the magnitude of the formation conductivity, so that the formation resistivity can be indirectly measured by measuring the induced electromotive force induced by the secondary field in the receiving coil.
The underground part of the array induction logging instrument consists of three parts, namely an electronic instrument nipple, a coil system and a transmitting nipple, wherein the coil system is a key component of the array induction instrument. The array induction logging instrument coil system is an array coil system formed by a plurality of subarrays. Each subarray consists of a transmitting coil and two receiving coils; the receiving coil close to the transmitting coil is a compensating receiving coil, and the receiving coil far away from the transmitting coil is a main receiving coil. The compensating receiving coil is connected in series with the main receiving coil but has opposite winding directions, and the compensating receiving coil and the transmitting coil form a mutual inductance balance three-coil system subarray. The array coil system with different radial detection depths, different longitudinal resolutions and balanced mutual inductance can be obtained by reasonably selecting the distance between the main receiving coil and the compensation receiving coil and the distance between the transmitting coil and the receiving coil.
The conventional array induction logging instrument coil system consists of 7 subarrays, such as an array induction logging coil system (200910235768.6) for measuring formation resistivity, which is disadvantageous in that the overall structure is long, resulting in a certain structural risk. Therefore, the coil system is improved and designed on the premise of ensuring the accuracy of the measurement result, and is a good structural optimization scheme. Meanwhile, the method can bring convenience to the production, installation, transportation and logging operation of the instrument.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a method for measuring the formation resistivity by utilizing a six-subarray coil system, which measures the formation conductivity by reducing one subarray on the original seven-subarray induction logging instrument, and simultaneously adopts a scientific algorithm aiming at the six-subarray coil system structure, so that accurate measurement results can be obtained after a pair of coils are reduced, and the structural risk caused by overlong length of the traditional array induction coil system is solved.
The technical purpose of the invention is realized by the following technical scheme:
a method for measuring stratum resistivity by a six-subarray coil system includes calculating and drawing a relation linked list of original apparent conductivity ratio of subarray 6A6B farthest from a transmitting coil and subarray 5A5B adjacent to the subarray 6A6B by a traditional seven-subarray coil system, measuring by utilizing a six-subarray coil system induction logger to obtain apparent conductivity of the farthest subarray 5A5B, inquiring on the relation linked list to obtain apparent conductivity conversion coefficients of subarray 5A5B and subarray 6A6B, and multiplying the original apparent conductivity information of the traditional coil system farthest subarray 6A6B by the conversion coefficient, wherein the original apparent conductivity ratio of subarray 5A5B is obtained by measuring by the six-subarray coil system.
The conventional seven-subarray coil system is a six-subarray coil system by removing subarrays 6A6B farthest from the transmitting coil.
The relation linked list is obtained by the following method: the change curve of the original apparent conductivity response of the subarray along with the stratum conductivity is calculated through a traditional seven subarray coil system, the ratio of the original apparent conductivities of the subarrays 6A6B and 5A5B is calculated, and a relation linked list of the ratios of the original apparent conductivities of the subarrays 5A5B and the adjacent subarrays 6A6B and the subarray 5A5B is drawn.
The subarray apparent conductivity calculation formula is as follows:
wherein ω represents angular frequency, μ represents permeability, and μ=4pi×10 is calculated -7 K represents the wavenumber of the formation medium, k=iωμσ, σ represents the electrical conductivity, i represents the imaginary sign, σ aR And the apparent conductivity corresponding to the real part signal is represented, beta represents the proportionality coefficient between the distances of the subarray transmitting coil, the receiving coil and the shielding coil, and beta is smaller than 1, namely the distances are L and beta L respectively.
The value range of the stratum conductivity sigma is 0.001-10.0S/m.
The beneficial effects of the invention are as follows:
through the six array induction coil systems of new design, effectively shortened the length of whole structure, the shortening of structure length makes the compressive and tensile strength of instrument promote greatly. Meanwhile, a scientific algorithm aiming at the novel coil system structure is adopted, so that the influence of the coil reduction on the measurement result is avoided, and an accurate measurement curve can still be obtained. Meanwhile, the novel coil system has the characteristics of simple structure and convenient maintenance and replacement, and the use cost and the maintenance cost of related equipment are reduced. In addition, the instrument belongs to the long rod class, effectively shortens the length and also can bring convenience for transportation and logging operation.
Drawings
FIG. 1 is a schematic diagram of a conventional coil system according to the present invention;
FIG. 2 is a schematic diagram of the coil system structure of the method of the present invention;
FIG. 3 is a graph of conductivity response from different subarrays according to the present invention;
FIG. 4 is a chart of a conductivity ratio conversion chain for adjacent subarrays in accordance with the present invention.
Detailed Description
The following description of the present invention will be made more complete and clear in view of the detailed description of the invention, which is to be taken in conjunction with the accompanying drawings that illustrate only some, but not all, of the embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a novel six-subarray coil system aiming at the defects of the traditional array induction coil system structure, and the novel six-subarray coil system has a unique coil system structure. The coil system is composed of 6 sub-arrays, which share a transmitting coil. All receiving coils are axially arranged at one side of the receiving coils, and the coil system in the form is simple in structure and easy to manufacture and debug; compared with 7 subarrays of the traditional coil, the coil system structure shares one transmitting coil for each subarray, so that on the basis of effectively shortening the length of the instrument, one subarray is reduced, namely a pair of receiving coils is reduced, the length of the instrument is further shortened, the structural performance of the system is greatly optimized, and the whole instrument is compact in structure and convenient to operate; in addition, because the coil system adopts the reinforced metal core shaft, the whole mechanical performance of the instrument is greatly improved, and a reliable passage is provided for the through line, so that the through line can be conveniently combined with other instruments for well logging, and the use flexibility of the instrument is greatly improved. Meanwhile, a scientific algorithm aiming at the new coil system structure is adopted, so that accurate measurement results can be obtained after a pair of coils is reduced.
As shown in fig. 1, the conventional coil array structure is composed of 7 sub-arrays each composed of one transmitting coil and two receiving coils. The two coils share one transmitting coil, all receiving coils are arranged on one side of the receiving coils along the axial direction, and the numbers of the receiving coils can be 0A0B, 1A1B, 2A2B, 3A3B, 4A4B, 5A5B and 6A6B in the figure, wherein the 6A6B coil group consists of two coils, namely A6A coil and A6B coil. The middle of the 6A coil and the 6B coil are separated by the glass fiber reinforced plastic sleeve, the situation that the total size of the connection of the 6A coil and the 6B coil is larger can be known through the above schematic diagram, certain improvement can be brought to the installation difficulty and the transportation difficulty, meanwhile, the whole structure of the instrument is overlong, and the risk of the system is increased. Therefore, if the coil system can be perfected on the basis of not influencing the measurement result, the improvement of the whole structural performance is highly necessary. As shown in FIG. 2, the novel coil system of the measuring method of the invention is formed by 6 subarrays, compared with the original coil system, a pair of coils, namely 6A and 6B and a glass fiber reinforced plastic sleeve, are reduced, the length is shortened by nearly one meter, the overall size is greatly shortened, and the tensile and compression indexes of the instrument are greatly improved.
On the basis of optimizing the instrument structure, a scientific processing algorithm aiming at the novel coil system measurement data is adopted, so that the acquisition and accuracy of the conductivity information of the 7 subarrays of the traditional coil system are ensured. The array induction logging can realize stratum information measurement under various frequencies and various source distances, and a 26.256KHz working frequency is taken as an example, and a novel coil system measurement data processing method is specifically described. And applying constant alternating current to the transmitting coil, and receiving stratum secondary induction fields by using different receiving coils to generate induced electromotive force, wherein the signal is an original measurement signal. The traditional 7 subarray coils are used for obtaining 7 original measurement signals at the working frequency, the novel coil system is used for obtaining 6 original measurement signals, and in order to avoid losing the measurement information of the longest source distance of the original coil system, the longest source distance measurement signals of the novel coil system are compensated by adopting a mathematical method, so that the 7 th measurement signal of the longest source distance subarray of the original coil system is obtained.
The array induction subarray consists of a transmitting coil and two receiving coils, is divided into two double coil systems,respectively represent the distances between the transmitting coils and the receiving coils and between the transmitting coils and the shielding coils of different subarrays.
Single set transmitting and receiving dual coil system apparent conductivity sigma a Is calculated according to the formula:
wherein: ω represents angular frequency, μ represents permeability, and μ=4pi×10 is calculated -7 K represents the wavenumber of the formation medium, k=iωμσ, σ represents the conductivity, and i represents the imaginary sign.
Based on the above, the subarray three coils look at the conductivity calculation formula:
wherein: sigma (sigma) aR And the apparent conductivity corresponding to the real part signal is represented, beta represents the proportionality coefficient between the distances of the subarray transmitting coil, the receiving coil and the shielding coil, and beta is smaller than 1, namely the distances are L and beta L respectively.
Through the above-mentioned three-coil array apparent conductivity calculation formula, the stratum conductivity value range is 0.001-10.0S/m, the calculation results in 7 subarray original apparent conductivity response curves along with the stratum conductivity change curve, as shown in figure 3, on the basis of which, the subarray 6A6B and subarray 5A5B original apparent conductivity ratio is further calculated, the relation linked list of subarray 5A5B original apparent conductivity ratios of the same subarray 6A6B and subarray 5A5B original apparent conductivity ratio is obtained, as shown in figure 4, the relation pair is (sigma a (5)，σ a (6)/σ a (5)). Under the novel six-subarray coil system structure, the original apparent conductivity information of the subarray 6A6B cannot be directly measured, and the measured subarray 5A5B original apparent conductivity information is taken as an example by using a relation linked list, and a corresponding abscissa is found in fig. 4, so that a ordinate value corresponding to the abscissa is 0.44, namely a conversion coefficient, and therefore the original conductivity information of the subarray 6A6B can be multiplied by the coefficient by the subarray 5A5B original conductivity.
σ a (6)＝(array(6)/array(5))*σ a (5)
Based on the novel six-array coil system probe structure, the data relation linked list conversion method is adopted, so that the apparent conductivity information acquisition and accuracy of the 7 th subarray of the traditional coil system structure are ensured.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A method for measuring stratum resistivity by a six-subarray coil system is characterized in that a relation chain table for drawing the original apparent conductivity ratio of subarray 6A6B farthest from a transmitting coil to adjacent subarray 5A5B to the original apparent conductivity of subarray 5A5B is calculated by a traditional seven-subarray coil system, the apparent conductivity of the farthest subarray 5A5B is measured by utilizing a six-subarray coil system induction logger, conversion coefficients of subarray 5A5B and subarray 6A6B are obtained by inquiring on the relation chain table, and then the original apparent conductivity information of subarray 6A6B farthest by the traditional coil system is the subarray 5A5B apparent conductivity obtained by measuring by the six-subarray coil system multiplied by the conversion coefficient;
the relation linked list is obtained by the following method: calculating a change curve of the original apparent conductivity response of the subarray along with the stratum conductivity by a traditional seven-subarray coil system, calculating the original apparent conductivity ratio of the subarray 6A6B to the subarray 5A5B, and drawing a relation linked list of the original apparent conductivity ratio of the subarray 5A5B to the adjacent subarray 6A 6B;
the subarray apparent conductivity calculation formula is as follows:
wherein ω represents angular frequency, μ represents permeability, and μ=4pi×10 is calculated -7 K represents the wavenumber of the formation medium, k=iωμσ, σ represents the electrical conductivity, i represents the imaginary sign, σ aR Represents the apparent conductivity corresponding to the real part signal, beta represents the proportionality coefficient between the distances of the subarray transmitting coil, the receiving coil and the shielding coil, beta<1, i.e. the distances L and βl, respectively.
2. A method of measuring formation resistivity in a six-sub-array coil system according to claim 1, wherein the conventional seven-sub-array coil system is a six-sub-array coil system with the sub-array 6A6B furthest from the transmitter coil removed.
3. The method of measuring formation resistivity in a six sub-array coil system as claimed in claim 1, wherein the formation conductivity σ is in a range of 0.001 to 10.0S/m.
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Effective date of registration: 20220127 Address after: 100029 Chaoyang District, Beijing Hui Xin Street six, Twelfth level. Applicant after: SINOPEC OILFIELD SERVICE Corp. Applicant after: Sinopec Jingwei Co.,Ltd. Applicant after: Southwest measurement and control company of Sinopec Jingwei Co.,Ltd. Address before: 100029 Chaoyang District, Beijing Hui Xin Street six, Twelfth level. Applicant before: SINOPEC OILFIELD SERVICE Corp. Applicant before: LOGGING BRANCH, SINOPEC SOUTHWEST PETROLEUM ENGINEERING CO.,LTD. |
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