CN116241239B - Well cementation evaluation method, device, equipment and storage medium based on far and near monopoles - Google Patents
Well cementation evaluation method, device, equipment and storage medium based on far and near monopoles Download PDFInfo
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- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 12
- 238000013441 quality evaluation Methods 0.000 claims description 11
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 10
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- 230000015572 biosynthetic process Effects 0.000 description 3
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- 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
- E21B47/005—Monitoring or checking of cementation quality or level
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- 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
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
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Abstract
The invention discloses a method, a device, equipment and a storage medium for well cementation evaluation based on a near-far monopole. Wherein the method comprises the following steps: the method comprises the steps of obtaining a near monopole casing wave received by a near monopole receiving transducer corresponding to a near monopole transmitting transducer at a well cementation preset measuring point during transmission and a far monopole casing wave received by a far monopole receiving transducer corresponding to a far monopole transmitting transducer during transmission, determining an evaluation index value of well cementation quality according to the energy of the near monopole casing wave, the energy of the far monopole casing wave and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer, and determining the well cementation quality according to the evaluation index value, so that the influence of the sensitivity inconsistency of an array receiving transducer can be eliminated, and the method has important significance for accurately evaluating the well cementation quality.
Description
Technical Field
The invention relates to the technical field of well logging, in particular to a well cementation evaluation method, device and equipment based on a near-far monopole and a storage medium.
Background
The cable orthogonal dipole acoustic logging instrument has wide application in oil and gas exploration and development. The logging instrument generally adopts a near monopole measurement mode to quickly measure formation time difference; measuring stratum longitudinal waves, transverse waves or stoneley waves by adopting a far monopole measurement mode; and measuring formation transverse waves and formation anisotropism by adopting a single dipole or an orthogonal dipole. Therefore, the logging instrument is generally used for evaluating stratum of an open hole well, is mainly applied to basic petrophysical interpretation, and can be used for evaluating porosity, judging lithology, identifying gas layer and analyzing permeability; the method has special advantages in the aspects of judging the stratum trend, stratum rock anisotropy, stratum principal stress distribution and the like.
The orthogonal dipole acoustic logging instrument can also be used for measuring the acoustic velocity of the stratum in the cased well, and in addition, the orthogonal dipole instrument is also newly explored for evaluating the well cementation quality in the cased well. For example, li Chengqing proposes a method and a processing device for evaluating the cementing quality by array acoustic logging (chinese patent, publication No. CN111980676a, publication date 2020, 11 months and 24 days). The method utilizes the sleeve wave attenuation measured by the far monopole emission and 8 receiving transducers to evaluate the well cementation quality. Zhang Conghui et al propose a method, apparatus and storage medium for determining the quality of well cementing, which also uses the attenuation of 8 array receiving transducers of long source distance to evaluate the quality of well cementing (chinese patent, publication No. CN112780259a, publication date 2021, month 05, 11).
Either method calculates the amplitude of the signal received by the array receiving transducer and then extracts the attenuation of the signal. However, in the practical application process, the piezoelectric crystals of the plurality of receiving transducers cannot be completely consistent, and the mechanical installation mode of the receiving transducers has a certain influence on the sensitivity of the receiving transducers, so that the attenuation of the array receiving transducers is utilized to evaluate the well cementation quality with great error. In addition, when long-source distance acoustic wave measurement is adopted, in a well section with good cementing quality, the attenuation of the casing wave is very serious, so that the casing wave amplitude of 8 receiving transducers is difficult to extract correctly.
Disclosure of Invention
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method, apparatus, electronic device and computer storage medium for near-far monopole based well cementing evaluation which overcomes or at least partially solves the above problems.
According to one aspect of the invention, there is provided a method of well cementation evaluation based on near-far monopoles, comprising:
acquiring a near-monopole sleeve wave received by a near-monopole receiving transducer corresponding to a near-monopole transmitting transducer at a well cementation preset measuring point during transmission and a far-monopole sleeve wave received by a far-monopole receiving transducer corresponding to a far-monopole transmitting transducer during transmission;
determining an evaluation index value of well cementation quality according to the energy of the near monopole casing wave, the energy of the far monopole casing wave and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer;
and determining the well cementation quality according to the evaluation index value.
According to another aspect of the present invention, there is provided an apparatus for evaluation of well cementation based on near-far monopole, comprising:
the casing wave acquisition module is used for acquiring the near-monopole casing waves received by the near-monopole receiving transducers corresponding to the near-monopole transmitting transducers of the preset well cementation measuring points and the far-monopole casing waves received by the far-monopole receiving transducers corresponding to the far-monopole transmitting transducers;
the index determining module is used for determining an evaluation index value of the well cementation quality according to the energy of the near monopole casing wave, the energy of the far monopole casing wave and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer;
and the quality evaluation module is used for determining the well cementation quality according to the evaluation index value.
According to another aspect of the present invention, there is provided an electronic apparatus including: the device comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete communication with each other through the communication bus;
the memory is used for storing at least one executable instruction, and the executable instruction enables the processor to execute the operation corresponding to the method for evaluating well cementation based on near-far monopole.
According to another aspect of the present invention, there is provided a computer storage medium having stored therein at least one executable instruction for causing a processor to perform operations corresponding to the method for near-far monopole-based well cementing evaluation of the present invention.
According to the method, the electronic equipment and the computer storage medium for well cementation evaluation based on the near-far monopole, disclosed by the invention, the well cementation quality evaluation index value is determined according to the energy of the near-near monopole casing wave, the energy of the far monopole casing wave and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer by acquiring the near monopole casing wave received by the near monopole receiving transducer corresponding to the near monopole transmitting transducer at the preset well cementation measuring point and the far monopole casing wave received by the far monopole receiving transducer corresponding to the far monopole transmitting transducer at the far monopole transmitting point, and the well cementation quality is determined according to the evaluation index value, so that the influence of the sensitivity inconsistency of the receiving transducer can be eliminated, and the method has important significance for accurately evaluating the well cementation quality.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic flow chart of a method for evaluating well cementation based on near-far monopole according to a first embodiment of the invention;
fig. 2 shows a schematic structural diagram of an orthogonal dipole acoustic logging tool in a method for evaluating well cementation based on near-far monopole according to a second embodiment of the present invention;
fig. 3 shows a schematic diagram of logging principle in a method for evaluating well cementation based on near-far monopole according to a second embodiment of the present invention;
FIG. 4 is a schematic flow chart of a method for evaluating well cementation based on near-far monopole according to a second embodiment of the invention;
FIG. 5 shows a sleeve wave schematic of a far monopole measurement in a method for evaluating well cementation based on a near-far monopole according to a second embodiment of the present invention;
FIG. 6 shows a sleeve wave schematic of a near-monopolar measurement in a method of evaluation of well cementing based on a near-far monopolar according to a second embodiment of the present invention;
FIG. 7 is a schematic diagram showing calculation results in a method for evaluating well cementation based on near-far monopole according to a second embodiment of the present invention;
fig. 8 shows a schematic structural diagram of a device for well cementation evaluation based on a near-far monopole according to a third embodiment of the present invention;
fig. 9 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
Fig. 1 shows a schematic flow chart of a method for evaluating well cementation based on near-far monopole according to a first embodiment of the invention. The execution main body of the embodiment is the device for well cementation evaluation based on the near-far monopole, which is provided by the embodiment of the invention, and the device can be realized by software or hardware. As shown in fig. 1, the method includes:
step S11, obtaining a near monopole sleeve wave received by a near monopole receiving transducer corresponding to a near monopole transmitting transducer of a well cementation preset measuring point and a far monopole sleeve wave received by a far monopole receiving transducer corresponding to a far monopole transmitting transducer.
Specifically, the logging instrument may be used to scan the preset measurement point of the well cementation, and the logging instrument at least includes a monopole transmitting transducer, a far monopole transmitting transducer, a near monopole receiving transducer and a far monopole receiving transducer, where the near monopole receiving transducer and the far monopole receiving transducer may be the same receiving transducer. For example, the tool may be an orthogonal dipole sonic tool.
The preset measuring point is a preset depth position (for example, 2000 meters in the pit) in the well, the near monopole transmitting transducer transmits an acoustic wave signal to the preset measuring point, the corresponding near monopole receiving transducer receives the acoustic wave signal reflected by the preset measuring point, namely, the near monopole sleeve wave, and similarly, the far monopole transmitting transducer transmits the acoustic wave signal to the preset measuring point, and the corresponding far monopole receiving transducer receives the acoustic wave signal reflected by the preset measuring point, namely, the far monopole sleeve wave.
And step S12, determining an evaluation index value of the well cementation quality according to the energy of the near monopole casing wave, the energy of the far monopole casing wave and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer.
Wherein the evaluation index value includes an attenuation rate of the sleeve wave and/or a cementing index of the sleeve wave.
Specifically, in order to make the calculation result more accurate, the band-pass filtering method may be used to filter the two sets of sleeve wave data first, so as to eliminate the influence of noise signals. For example, the frequency range of the band-pass filtering may be 2khz to 20khz.
Then, in the sleeve wave interval, the energy of the sleeve wave is calculated in a certain window length for the two groups of filtered waveforms, for example, a root mean square method, a maximum amplitude method and the like can be adopted. For example, a start position of the sleeve wave is found, 2 to 3 cycles of the waveform are taken at the start position, windowing is performed, a root mean square of the waveform in the window is calculated, the root mean square is taken as the energy of the sleeve wave signal, or a maximum value of the signal is obtained for the waveform in the window, and the maximum value is taken as the energy of the sleeve wave signal. And then determining an evaluation index value of the well cementation quality according to the energy of the two sets of sleeve waves and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer.
And S13, determining the well cementation quality according to the evaluation index value.
Specifically, the well cementation quality evaluation criteria may be preset, for example, the well cementation quality is classified into several grades such as excellent, good, medium, poor, and poor, an index value range is set for each grade, and in which index value range the calculated evaluation index value is determined, thereby determining which grade the well cementation quality belongs to.
When the evaluation index value is the attenuation rate of the casing wave, the well cementation quality evaluation standard may be preset according to the known attenuation rate and the corresponding well cementation quality, for example, the well cementation quality is classified into several grades such as excellent, good, medium, poor, and poor, the corresponding attenuation rate range is set for each grade, and the calculated attenuation rate is determined in which attenuation rate range, thereby determining which grade the well cementation quality belongs to.
When the evaluation index value is the cementing index of the casing wave, the cementing quality evaluation standard may be preset according to the known cementing index and the corresponding cementing quality, for example, the cementing quality is classified into several grades such as excellent, good, medium, poor, and poor, the corresponding cementing index range is set for each grade, and the calculated cementing index is determined in which cementing index range, thereby determining which grade the cementing quality belongs to.
When the evaluation index value is the attenuation rate and the cementing index of the casing wave, the well cementation quality evaluation results corresponding to the two indexes are referred to simultaneously, if the evaluation results are consistent, the result is taken as a final evaluation result, and if the evaluation results are inconsistent, one of the evaluation results with lower order is selected as the final evaluation result. Alternatively, a weighted average of both is obtained, and the weighted average is used as an evaluation index. For example, a well cementation quality evaluation criterion may be preset according to a weighted value of a known attenuation rate and a known cementation index and a corresponding well cementation quality, for example, the well cementation quality is classified into several grades such as excellent, good, medium, poor, etc., a corresponding cementation index range is set for each grade, and a calculated cementation index is determined in which cementation index range, thereby determining which grade the well cementation quality belongs to.
Therefore, according to the embodiment, through obtaining the near monopole casing wave received by the near monopole receiving transducer corresponding to the near monopole transmitting transducer at the preset well cementation measuring point and the far monopole casing wave received by the far monopole receiving transducer corresponding to the far monopole transmitting transducer at the preset well cementation measuring point, the evaluation index value of the well cementation quality is determined according to the energy of the near monopole casing wave, the energy of the far monopole casing wave and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer, and the well cementation quality is determined according to the evaluation index value, so that the influence of the sensitivity inconsistency of the receiving transducer can be eliminated, and the method has important significance for accurately evaluating the well cementation quality.
In an alternative embodiment, step S12 specifically includes:
step S121, determining the attenuation rate of the sleeve wave according to the energy of the near monopole sleeve wave, the energy of the far monopole sleeve wave, and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer.
Specifically, it can be according to the formulaDetermining the attenuation rate of the sleeve wave;
wherein,,the attenuation rate of the sleeve wave; l is the interval; s1 is the energy of a near-monopole sleeve wave; s2 is the energy of the far monopole sleeve wave.
Step S122, determining an evaluation index value of the well cementation quality according to the attenuation rate.
In an alternative embodiment, step S122 specifically includes:
determining the cementing index of the casing wave according to the attenuation rate, the attenuation rate of the casing wave at the free casing position and the attenuation rate of the casing wave when the cement cementing quality is good; and taking the attenuation rate and/or the cementing index as an evaluation index value of the well cementation quality.
Specifically, it can be according to the formulaDetermining a cementing index of the casing wave;
wherein,,is the cementing index of the casing wave; />The attenuation rate of the sleeve wave; />Is the attenuation rate of the sleeve wave at the free sleeve position; />The attenuation rate of the sleeve wave is good when the cement bond quality is good.
In an alternative embodiment, the method further comprises:
step S14, determining a reference point according to the positions of the near monopole transmitting transducer and the near monopole receiving transducer.
Step S15, performing position correction on the preset measurement points according to the reference points.
Specifically, in acoustic logging, since there are a plurality of transmitting transducers, which are not located at the same depth point, correction of the position of the preset measurement point is required. The calculated decay rate and/or cementing index of the casing wave needs to be shifted down or up in depth based on the reference point.
In an alternative embodiment, step S14 specifically includes:
determining a distance between a center position of the near-monopole transmitting transducer and a center position of the near-monopole receiving transducer; the position of half the distance is taken as the reference point.
Example two
FIG. 2 is a schematic diagram of a structure of an orthogonal dipole acoustic logging tool. The logging instrument has three groups of transmitting transducers, namely a near monopole transmitting transducer T1, an orthogonal dipole transmitting transducer T2 and a far monopole transmitting transducer T3. When the T1 works, four receiving transducers R1-R4 receive signals; and when the T3 works, 8 receiving transducers R1-R8 receive signals. A sound insulator 5 is arranged between the T1 transmitting transducer and the R1 receiving transducer. The distance between T1 and R1 is L1, the distance between T1 and T2 is L2, and the distance between T2 and T3 is L3. Logging is performed based on the orthogonal dipole acoustic logging tool, which is composed of a stratum 4, a cement sheath 3, a casing 2 and a well bore 1 from outside to inside, and is centrally placed in the well bore filled with fluid, as can be seen from fig. 3. T1, T3 operate to generate a casing wave in the casing 2, which is received by R1. When T1 and T3 work, the transmitting transducers adopted by T1 and T3 are completely consistent, and the excitation circuit, the transformer and the like are also completely consistent. The propagation paths of the sleeve waves generated by the excitation of the two transducers can be equivalently that a virtual emission source is constructed at the R1 position, and two virtual receiving transducers are arranged at the T1 and T3 positions. This virtual received signal is identical to the signal received by the actual two sets of transmitting transducers transmitting R1.
The embodiment of the invention is described in detail based on the scenario of logging by the orthogonal dipole acoustic logging instrument. As shown in fig. 4, the method specifically includes:
step S21, selecting a preset measuring point in a preset depth interval of well cementation, and respectively acquiring the sleeve wave received by R1 during T1 transmission and the sleeve wave received by R1 during T3 transmission.
As shown in fig. 5, the sleeve wave is measured with the depth point far monopole, and fig. 6 is measured with the depth point near monopole. As can be seen, the head wave measured in both measurement modes is a sleeve wave signal.
And S22, filtering the two sets of sleeve wave data by adopting a band-pass filtering method to eliminate noise signals.
Step S23, in the sleeve wave interval, the energy of the sleeve waves is calculated in a certain window length for the two groups of the filtered sleeve waves.
For example, a root mean square method, a maximum amplitude method, or the like can be employed.
And step S24, calculating the attenuation rate and the cementing index of the sleeve waves according to the energy of the two groups of filtered sleeve waves and the distance between T1 and T3.
As shown in FIG. 2, the T1 and T3 spacing is。
Step S25, depth correction.
As shown in fig. 2, if the half position of the center of T1 from the center of R1 is the reference point, the attenuation rate and the cementing index of the sleeve wave calculated in step S24 need to be shifted downward or upward in depth by the following distances:。
and S26, obtaining the attenuation rate and the cementing index of the sleeve wave in the whole depth interval.
And S27, determining the well cementation quality according to the attenuation rate and the cementing index of the sleeve wave in the whole depth interval.
As shown in fig. 7, the calculation result of the present embodiment is exemplified, in which the first trace is a variable density waveform diagram of the near monopole R1 receiving transducer, the second trace is a variable density waveform diagram of the far monopole R1 receiving transducer, the third trace is a sleeve wave attenuation curve calculated by the present embodiment, and the fourth trace is a cementing index curve. As can be seen from the graph, the attenuation rate of the sleeve wave is larger near the 2620m and 2880 well sections, and can reach about 10 dB/m; 1450-1500m, the attenuation rate of the sleeve wave is small, about 3dB/m, and basically the response of the free sleeve; other well sections are generally of cement bond quality.
Example III
Fig. 8 shows a schematic structural diagram of a device for well cementation evaluation based on near-far monopole according to the third embodiment of the present invention. As shown in fig. 8, the apparatus includes: a sleeve wave acquisition module 31, an index determination module 32, and a quality evaluation module 33; wherein,,
the casing wave obtaining module 31 is configured to obtain a near-monopole casing wave received by a near-monopole receiving transducer corresponding to a near-monopole transmitting transducer at a preset measurement point of well cementation and a far-monopole casing wave received by a far-monopole receiving transducer corresponding to a far-monopole transmitting transducer;
the index determination module 32 is configured to determine an evaluation index value of the well cementation quality according to the energy of the near monopole casing wave, the energy of the far monopole casing wave, and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer;
the quality evaluation module 33 is used for determining the well cementation quality according to the evaluation index value.
Further, the index determination module 32 is specifically configured to: determining the attenuation rate of the sleeve wave according to the energy of the near monopole sleeve wave, the energy of the far monopole sleeve wave and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer; and determining an evaluation index value of the well cementation quality according to the attenuation rate.
Further, the index determination module 32 is specifically configured to: determining the cementing index of the casing wave according to the attenuation rate, the attenuation rate of the casing wave at the free casing position and the attenuation rate of the casing wave when the cement cementing quality is good; and taking the attenuation rate and/or the cementing index as an evaluation index value of the well cementation quality.
Further, the device further comprises: a correction module 34; wherein,,
the correction module 34 is configured to determine a reference point based on the locations of the near monopole transmit transducer and the near monopole receive transducer; and correcting the position of the preset measuring point according to the reference point.
Further, the correction module 34 is specifically configured to: determining a distance between a center position of the near-monopole transmit transducer and a center position of the near-monopole receive transducer; the position of half the distance is taken as a reference point.
Further, the index determination module 32 is specifically configured to:
according to the formulaDetermining the attenuation rate of the sleeve wave;
wherein,,the attenuation rate of the sleeve wave; l is the interval; s1 is the energy of a near-monopole sleeve wave; s2 is the energy of the far monopole sleeve wave.
Further, the index determination module 32 is specifically configured to: the determining the cementing index of the casing wave according to the attenuation rate, the attenuation rate of the casing wave at the free casing position and the attenuation rate of the casing wave when the cement cementing quality is good comprises the following steps:
according to the formulaDetermining a cementing index of the casing wave;
wherein,,is the cementing index of the casing wave; />The attenuation rate of the sleeve wave; />Is the attenuation rate of the sleeve wave at the free sleeve position; />The attenuation rate of the sleeve wave is good when the cement bond quality is good.
The device for well cementation evaluation based on the near-far monopole according to the present embodiment is used for executing the method for well cementation evaluation based on the near-far monopole according to the first embodiment and the second embodiment, and the working principle is similar to the technical effect, and is not repeated here.
Example IV
A fourth embodiment of the present invention provides a non-volatile computer storage medium, where at least one executable instruction is stored, where the computer executable instruction may perform the method for evaluating cementing based on near-far monopole in any of the above method embodiments.
Example five
Fig. 9 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present invention. The specific embodiments of the present invention are not limited to specific implementations of electronic devices.
As shown in fig. 9, the electronic device may include: a processor 502, a communication interface 504, a memory 506, and a communication bus 508.
Wherein: processor 502, communication interface 504, and memory 506 communicate with each other via communication bus 508. A communication interface 504 for communicating with network elements of other devices, such as clients or other servers. The processor 502 is configured to execute the program 510, and may specifically perform relevant steps in the method embodiments described above.
In particular, program 510 may include program code including computer-operating instructions.
The processor 502 may be a central processing unit CPU, or an application specific integrated circuit ASIC, or one or more integrated circuits configured to implement embodiments of the present invention. The one or more processors included in the electronic device may be the same type of processor, such as one or more CPUs; but may also be different types of processors such as one or more CPUs and one or more ASICs.
A memory 506 for storing a program 510. Memory 506 may comprise high-speed RAM memory, and may also include non-volatile memory, such as at least one disk memory.
The program 510 may be specifically adapted to cause the processor 502 to perform the method of far and near monopolar based well cementing evaluation in any of the method embodiments described above.
The algorithms or displays presented herein are not inherently related to any particular computer, virtual system, or other apparatus. Various general-purpose systems may also be used with the teachings herein. The required structure for a construction of such a system is apparent from the description above. In addition, embodiments of the present invention are not directed to any particular programming language. It will be appreciated that the teachings of the present invention described herein may be implemented in a variety of programming languages, and the above description of specific languages is provided for disclosure of enablement and best mode of the present invention.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the above description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.
Various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that some or all of the functionality of some or all of the components according to embodiments of the present invention may be implemented in practice using a microprocessor or Digital Signal Processor (DSP). The present invention can also be implemented as an apparatus or device program (e.g., a computer program and a computer program product) for performing a portion or all of the methods described herein. Such a program embodying the present invention may be stored on a computer readable medium, or may have the form of one or more signals. Such signals may be downloaded from an internet website, provided on a carrier signal, or provided in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specifically stated.
Claims (8)
1. A method for evaluating well cementation based on near-far monopoles, comprising:
acquiring a near-monopole sleeve wave received by a near-monopole receiving transducer corresponding to a near-monopole transmitting transducer at a well cementation preset measuring point during transmission and a far-monopole sleeve wave received by a far-monopole receiving transducer corresponding to a far-monopole transmitting transducer during transmission;
determining an evaluation index value of well cementation quality according to the energy of the near monopole casing wave, the energy of the far monopole casing wave and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer;
determining the well cementation quality according to the evaluation index value;
wherein the determining an evaluation index value of the well cementation quality according to the energy of the near monopole casing wave, the energy of the far monopole casing wave, and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer comprises:
determining the attenuation rate of the sleeve wave according to the energy of the near monopole sleeve wave, the energy of the far monopole sleeve wave and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer;
determining an evaluation index value of the well cementation quality according to the attenuation rate;
wherein, the determining the evaluation index value of the well cementation quality according to the attenuation rate comprises the following steps:
determining the cementing index of the casing wave according to the attenuation rate, the attenuation rate of the casing wave at the free casing position and the attenuation rate of the casing wave when the cement cementing quality is good;
taking the attenuation rate and/or the cementing index as an evaluation index value of the well cementation quality;
wherein the determining the well cementation quality according to the evaluation index value comprises:
the well cementation quality is divided into several grades of excellent, good, medium, poor and poor, an index value range is set for each grade, and the calculated evaluation index value is determined in which index value range, so that the well cementation quality is determined to belong to which grade.
2. The near-far monopole based well cementation evaluation method according to claim 1, further comprising:
determining a reference point from the locations of the near-monopole transmit transducer and the near-monopole receive transducer;
and correcting the position of the preset measuring point according to the reference point.
3. The method of near-far monopole-based well cementing evaluation according to claim 2, wherein said determining a reference point from the locations of the near monopole transmitting transducer and the near monopole receiving transducer comprises:
determining a distance between a center position of the near-monopole transmit transducer and a center position of the near-monopole receive transducer;
the position of half the distance is taken as a reference point.
4. The method of far and near monopole-based well cementing evaluation according to claim 1, wherein the determining the decay rate of the casing wave from the energy of the near monopole casing wave, the energy of the far monopole casing wave, and the spacing of the near monopole transmitting transducer and the far monopole transmitting transducer comprises:
according to the formulaDetermining the attenuation rate of the sleeve wave;
wherein,,the attenuation rate of the sleeve wave; l is the interval; s1 is the energy of a near-monopole sleeve wave; s2 is the energy of the far monopole sleeve wave.
5. The method of far and near monopole based well cementation evaluation according to claim 1, wherein the determining the cement index of the casing wave according to the attenuation rate, the attenuation rate of the casing wave at the free casing position, the attenuation rate of the casing wave when the cement bond quality is good comprises:
according to the formulaDetermining a cementing index of the casing wave;
wherein,,is the cementing index of the casing wave; />Attenuation of sleeve wavesA rate; />Is the attenuation rate of the sleeve wave at the free sleeve position; />The attenuation rate of the sleeve wave is good when the cement bond quality is good.
6. A device for evaluating well cementation based on near-far monopoles, comprising:
the casing wave acquisition module is used for acquiring the near-monopole casing waves received by the near-monopole receiving transducers corresponding to the near-monopole transmitting transducers of the preset well cementation measuring points and the far-monopole casing waves received by the far-monopole receiving transducers corresponding to the far-monopole transmitting transducers;
the index determining module is used for determining an evaluation index value of the well cementation quality according to the energy of the near monopole casing wave, the energy of the far monopole casing wave and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer;
the quality evaluation module is used for determining the well cementation quality according to the evaluation index value;
the index determining module is specifically configured to: determining the attenuation rate of the sleeve wave according to the energy of the near monopole sleeve wave, the energy of the far monopole sleeve wave and the distance between the near monopole transmitting transducer and the far monopole transmitting transducer; determining the cementing index of the casing wave according to the attenuation rate, the attenuation rate of the casing wave at the free casing position and the attenuation rate of the casing wave when the cement cementing quality is good; taking the attenuation rate and/or the cementing index as an evaluation index value of the well cementation quality;
the quality evaluation module is specifically configured to: the well cementation quality is divided into several grades of excellent, good, medium, poor and poor, an index value range is set for each grade, and the calculated evaluation index value is determined in which index value range, so that the well cementation quality is determined to belong to which grade.
7. An electronic device, comprising: the device comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete communication with each other through the communication bus;
the memory is configured to store at least one executable instruction that causes the processor to perform operations corresponding to the method of near-far monopole-based well cementing evaluation according to any one of claims 1 to 5.
8. A computer storage medium having stored therein at least one executable instruction for causing a processor to perform operations corresponding to the method of near-far monopole-based well cementing evaluation according to any one of claims 1 to 5.
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