CN115685339A - Three-component distributed optical fiber acoustic wave sensing array acoustic logging device and measuring method - Google Patents
Three-component distributed optical fiber acoustic wave sensing array acoustic logging device and measuring method Download PDFInfo
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Abstract
The invention relates to a borehole three-component distributed optical fiber acoustic sensing array acoustic logging device, which uses a three-component distributed acoustic sensing optical cable to replace a monopole or dipole or multipole piezoelectric acoustic receiving transducer in the conventional array acoustic logging device. The instrument can completely collect array sound wave signals in a high-temperature deep well for a long time, the underground receiving sensor does not need any electronic device or circuit, and the difficult problem that the underground monopole or dipole or multipole piezoelectric sound wave receiving transducer, a high-cost amplifier, an analog-to-digital conversion and data storage device, an underground data transmission module and the like which are matched with the underground monopole or dipole or multipole piezoelectric sound wave receiving transducer cannot work at the high temperature for a long time is solved. Through the armored photoelectric composite cable connected with the optical fiber array acoustic logging device, backward Rayleigh scattering optical signals in the three-component distributed acoustic sensing optical cable can be transmitted to a ground multichannel DAS modulation and demodulation instrument at a high speed, and the bottleneck problem that a large number of data signals acquired by the underground array acoustic logging device are difficult to realize high-speed upward transmission is solved.
Description
Technical Field
The invention relates to the technical field of geophysical exploration, in particular to a three-component distributed optical fiber acoustic wave sensing array-based acoustic wave logging device and a measuring method.
Background
When sound waves propagate in different media, acoustic characteristics such as changes in speed, amplitude and frequency are different. Acoustic logging is a logging method for determining the quality of well cementation by using the acoustic properties of rock to study the geological profile of a drilled well.
Sonic logging is a method of logging the properties of a formation in a borehole by studying the speed of sound propagation in the formation. A commonly used array sonic velocity tool comprises a set of sonic generators (T) and two receivers (R, R) 1 ) Or a plurality of receivers. The parameter recorded is the time difference (Δ t) of arrival of the acoustic wave at the two receivers, i.e. the time required for the acoustic wave to propagate in the formation between the two receivers. In practice, it is a time measurement system. The speed at which sound waves travel through the formation is determined by the elasticity, density of the rock, and the properties of the fluid in the pores, among other things.
A controlled acoustic vibration source is placed in the well, and acoustic waves emitted by the acoustic source cause vibration of surrounding particles, bulk waves, i.e., longitudinal waves and transverse waves, are generated in the formation, and induced interfacial waves, i.e., pseudo-Rayleigh waves and Stoneley waves, are generated at the well wall-drilling fluid interface. These waves are used as carriers of formation information, received by downhole receivers, sent to the surface for recording, and are used for acoustic logging. The receiver and the acoustic source are collectively called as acoustic system, and the acoustic logging instrument can be divided into a compensated logging instrument (BHC), a long-source-distance acoustic logging instrument (LSS) and an array acoustic logging instrument according to different arrangement and sizes of the acoustic system. The speed, amplitude and even frequency of the wave that propagates in the formation in the well changes due to changes in the rock composition, structure, and fluid composition in the pores of the formation. Sonic logging is divided into sonic logging and acoustic amplitude logging. Recording only changes in acoustic velocity is called sonic logging (AC), while recording changes in acoustic amplitude is called acoustic amplitude logging. In the acoustic velocity logging, a short-source acoustic system only records propagation time difference of longitudinal waves (head waves), a long-source distance acoustic system can record propagation time difference of various wave trains such as longitudinal waves, transverse waves, pseudo-Rayleigh waves, stoneley waves and the like, so the acoustic velocity logging is also called full-wave acoustic logging, and an array acoustic wave instrument can record not only the sound velocity of the longitudinal waves but also the sound velocity of the full wave trains and also sound amplitude due to the complex acoustic system.
Sonic logging measures the formation acoustic velocity. The formation acoustic velocity is related to factors such as the lithology, porosity, and pore fluid properties of the formation. According to the propagation speed of the sound wave in the stratum, the stratum porosity, lithology or pore fluid property can be determined. Sonic velocity logging can be used to classify lithology, determine porosity of oil and gas reservoirs, and to classify gas reservoirs, and can also provide velocity data necessary for seismic exploration.
Acoustic velocity logging, referred to as sonic logging, records the time required for an acoustic wave to pass through a 1 meter formation and measures the time difference Δ t (the reciprocal of the formation compressional velocity) of the formation glide wave. The method is mainly used for calculating the porosity of the stratum, analyzing the lithology of the stratum, judging the gas layer and the like.
The array acoustic logging instrument is improved from a long-source-distance acoustic full-wave-train logging instrument. It has two sound wave transmitting transducers at a distance of 0.61m and eight sound wave receiving probes arranged in linear arrays at a distance of 0.15m. The source distance between the transmitting transducer and the receiving probe is 2.44m at the shortest and 4.12m at the longest. There are also sonic velocity logging sonications with source spacings of 0.92m and 1.53 m. The acoustic system of the array acoustic logging instrument can be regarded as being formed by combining a linear array acoustic system and a double-transmitting and double-receiving acoustic system.
Modern sonic logging tools commonly employ a plurality of sensors, forming a so-called array sonic logging tool, such as the DAC from atlas, the MAC, and the DSl from schlumberger. By recording a plurality of curves to carry out correlation and superposition processing, interference can be effectively suppressed, and various information of longitudinal waves, transverse waves and Stoneley waves can be accurately extracted. The small spacing of the receivers can meet the requirements of thin layer research.
The lower part of an acoustic system of the array acoustic logging is provided with two piezoelectric ceramic emitters, the distance between the two piezoelectric ceramic emitters is 2ft (61 cm), and the bandwidth of the emitters is 5-18 kHz. The upper part of the acoustic system has 8 piezoceramic receivers, the distance between each receiver is 6in (15.2 cm), and the group of receivers is used for array acoustic logging. The source distance between the first receiver and the upper transmitter is 8ft, the distance between the first receiver and the lower transmitter is 10ft, the distance between the first receiver and the fifth receiver is 2ft, and the acoustic system can form long source range acoustic logging with the source distances of 8ft and 10ft respectively.
Two receivers with the distance of 2ft are arranged in the middle of the acoustic system, and the receivers, the upper transmitter and the lower transmitter form standard borehole compensation logging with the source distances of 5ft and 7ft respectively, and can be used for open hole well measurement; in cased holes, a Cement Bond Log (CBL) can be performed with an acoustic system having a source spacing of 3ft and a Variable Density Log (VDL) can be performed with an acoustic system having a source spacing of 5ft, both measurements being useful for checking cement bond quality. At the very top of the instrument is a measurement system for measuring the sound velocity of the fluid in the well, with the transmitter and receiver in close proximity, and the acoustic velocity of the fluid in the well can be continuously measured during logging.
The existing underground array acoustic far detection instrument uses a monopole or dipole or multipole piezoelectric acoustic transducer to receive direct waves of formations around a borehole and reflected wave signals reflected back to the borehole by an impedance interface of the surrounding waves, and the monopole or dipole or multipole piezoelectric acoustic transducer and an amplifier, an analog-to-digital conversion and data storage device, an underground data transmission module and the like which are matched with the monopole or dipole or multipole piezoelectric acoustic transducer cannot work for a long time in a high-temperature environment (deep well). In addition, because the underground array acoustic well instruments are all electronic instruments at present, the underground data transmission module of the underground array acoustic well instruments cannot solve the bottleneck problem that underground big data are transmitted to a control computer in a well head logging truck at high speed in real time at present.
Disclosure of Invention
The invention aims to provide a sound logging device based on a three-component distributed optical fiber sound wave sensing array, which mainly uses a high-temperature-resistant three-component distributed sound wave sensing optical cable arranged above and below a downhole combined sound wave emission source to replace a monopole, dipole or multipole piezoelectric sound wave receiving transducer widely used at present, and receives reflected wave signals reflected back to a borehole by a direct wave and a peripheral wave impedance interface of a stratum around the borehole, thereby realizing the purpose of logging the sound logging by the underground optical fiber array.
The technical scheme of the invention is as follows:
the acoustic logging device comprises an acoustic logging device of a three-component distributed optical fiber acoustic sensing array in a well, a high-temperature-resistant armored photoelectric composite logging cable, a ground wellhead logging truck and a ground three-component distributed optical fiber acoustic sensing (DAS) modulation-demodulation instrument;
the in-well three-component distributed optical fiber acoustic wave sensing array acoustic logging device comprises a high-temperature-resistant distributed three-component acoustic wave sensing optical cable serving as an in-well three-component acoustic wave signal receiving unit; the monopole dipole quadrupoles are combined with the sound wave emission source, the circuit of the combined sound wave emission source is short-circuited, and the sound insulator and the optical fiber gyroscope are arranged on the sound insulator; the ground wellhead logging truck is connected with the in-well three-component distributed optical fiber acoustic wave sensing array acoustic logging device through a high-temperature-resistant armored photoelectric composite cable;
the ground wellhead logging truck controls the well descending and the well ascending of the three-component distributed optical fiber acoustic wave sensing array acoustic logging device in the well through the high-temperature-resistant armored photoelectric composite cable, provides a 250-volt direct-current power supply for the optical fiber acoustic wave sensing array acoustic logging device in the well, and drives the combined acoustic wave emission source circuit to be in short circuit and the combined acoustic wave emission source to continuously and repeatedly emit acoustic wave signals during operation;
a ground three-component distributed optical fiber acoustic wave sensing (DAS) modulation and demodulation instrument arranged at a wellhead is connected with a distributed three-component acoustic wave sensing optical cable through a high-temperature-resistant armored photoelectric composite cable, emits laser pulses into the distributed three-component acoustic wave sensing optical cable and synchronously collects backscattered Rayleigh waves in the distributed three-component acoustic wave sensing optical cable.
The ground three-component distributed optical fiber acoustic wave sensing (DAS) modem has five DAS data input ports and one optical fiber gyroscope data input port.
The acoustic wave sensing optical cable is distributing type three-component acoustic wave sensing optical cable, its length is between 3 meters to 5 meters, distributing type three-component acoustic wave sensing optical cable embeds there is square cylindricality elastomer, square cylindricality elastomer center has inlayed a high temperature resistant straight shape single mode fiber, four sides of square cylindricality elastomer are laid four high temperature resistant anti bending or crooked insensitive waveform single mode fiber according to sine waveform or cosine waveform inseparable veneer, two high temperature resistant anti bending or crooked insensitive waveform single mode fiber place of arbitrary two adjacent sides are all perpendicular mutually, the deluster is all installed to the tail end of straight shape single mode fiber and waveform single mode fiber, head end that a straight shape single mode fiber and four waveform single mode fiber kept away from the deluster do not in the well head punishment with five DAS data input port connect.
The optical fiber gyroscope, namely an optical fiber inertial navigation directional positioning system, is installed at the top end of the three-component distributed optical fiber acoustic wave sensing array acoustic logging device in a well, and measures the azimuth, the inclination angle and the inclination of the optical fiber acoustic wave sensing array acoustic logging device in real time through a high-temperature-resistant armored photoelectric composite cable. When the three-component distributed optical fiber acoustic wave sensing array acoustic logging device in the well works, the optical fiber gyroscope synchronously records the real-time position, the speed and the three-component attitude information of the underground optical fiber acoustic wave sensing array acoustic logging device. When the underground optical fiber acoustic sensing array acoustic logging device is in communication connection with the multi-channel control and data acquisition subsystem in the ground logging truck, the underground optical fiber acoustic sensing array acoustic logging device uploads actually measured underground three-component acoustic logging data to the ground control and data acquisition processing subsystem, and the optical fiber gyroscope uploads the actually measured real-time position, speed and attitude information of the underground optical fiber acoustic sensing array acoustic logging device to the ground control and data acquisition processing subsystem. The real-time position, speed and attitude information of the underground optical fiber acoustic sensing array acoustic logging device recorded by the optical fiber gyroscope in real time is used for positioning and orienting the three-component acoustic logging data in the well acquired by the system so as to identify the position and specific direction of a wave impedance interface around the borehole and realize accurate and reliable detection of targets around the underground borehole.
The combined sound wave emission source circuit is placed at the upper end of the optical fiber sound wave sensing array sound wave logging device in a short circuit mode and used for driving the combined sound wave emission source in the optical fiber sound wave sensing array sound wave logging device, the combined sound wave emission source is installed in the middle of the optical fiber sound wave sensing array sound wave logging device and comprises two monopole sound wave emission sources, two dipole sound wave emission sources which are mutually orthogonal and two quadrupole sound wave emission sources. The two monopole sound wave emission sources are symmetrically arranged on two sides of the two orthogonal dipole sound wave emission sources, and the two quadrupole sound wave emission sources are respectively symmetrically arranged on two sides of the whole body formed by the two monopole sound wave emission sources.
Two sound insulators are symmetrically arranged at two ends of the combined sound wave emission source and used for blocking or obstructing the body wave energy of the combined sound wave emission source from being directly coupled to the distributed three-component sound wave sensing optical cable.
The two sections of distributed three-component acoustic sensing optical cables with completely the same structural size are symmetrically arranged at the two sides of the outside of the whole body formed by the two sound insulators respectively in a combined acoustic emission source;
sequentially exciting a monopole sound wave emission source, a quadrupole sound wave emission source and two mutually orthogonal dipole sound wave emission sources which are positioned at the upper end of the dipole sound wave emission source, and collecting three-component sound wave signals from the stratum around the well hole by a distributed three-component sound wave sensing optical cable arranged at the upper part of the combined sound wave emission source;
and then sequentially exciting a monopole sound wave emission source, a quadrupole sound wave emission source and two mutually orthogonal dipole sound wave emission sources which are positioned at the lower end of the dipole sound wave emission source, and collecting three-component sound wave signals from the stratum around the well hole by a distributed three-component sound wave sensing optical cable arranged at the lower part of the combined sound wave emission source.
The optical fiber acoustic sensing array acoustic logging device is characterized in that a distributed three-component acoustic sensing optical cable is arranged in the middle of the optical fiber acoustic sensing array acoustic logging device, two groups of sound insulators are arranged on two sides of the distributed three-component acoustic sensing optical cable respectively, two sets of completely identical monopole dipole quadrupole combined acoustic emission sources are symmetrically arranged on the outer side of a whole formed by the two groups of sound insulators respectively, the combined acoustic emission source circuit short circuit and the optical fiber gyroscope are arranged at the top of the optical fiber acoustic sensing array acoustic logging device, and each combined acoustic emission source comprises a monopole acoustic emission source, a quadrupole acoustic emission source and two mutually orthogonal dipole acoustic emission sources which are sequentially arranged in the direction away from the distributed three-component acoustic sensing optical cable.
The measuring method based on the three-component distributed optical fiber acoustic wave sensing array acoustic wave logging device comprises the following steps:
s1: connecting a high-temperature-resistant armored photoelectric composite cable on a winch of a ground wellhead logging truck with a three-component distributed optical fiber acoustic wave sensing array acoustic logging device in a well;
s2: the high-temperature-resistant armored photoelectric composite cable on a winch of a ground wellhead logging truck is used for lowering the three-component distributed optical fiber acoustic wave sensing array acoustic logging device in the well to the bottom of the well;
s3: the method comprises the following steps that (1) an underground optical fiber acoustic wave sensing array acoustic logging device is lifted upwards at a low speed through a high-temperature-resistant armored photoelectric composite cable on a winch of a ground wellhead logging truck, and an instruction is sent to a short circuit of a combined acoustic wave emission source circuit in the underground optical fiber acoustic wave sensing array acoustic logging device, so that 2 monopole acoustic wave emission sources in the combined acoustic wave emission sources, 2 dipole acoustic wave emission sources which are mutually orthogonal and two quadrupole acoustic wave emission sources are driven to sequentially excite acoustic wave signals;
s4: simultaneously starting the optical fiber gyroscope, and measuring and recording the direction, the inclination angle and the inclination of the upwards-lifted optical fiber acoustic wave sensing array acoustic logging device along the well track in real time;
s5: simultaneously starting a ground three-component distributed optical fiber acoustic wave sensing (DAS) modulation and demodulation instrument, transmitting high-power multi-frequency narrow pulse laser signals to a distributed three-component acoustic wave sensing optical cable in the underground optical fiber acoustic wave sensing array acoustic logging device through a high-temperature-resistant armored photoelectric composite cable, and receiving backward Rayleigh scattering light signals on a straight single-mode optical fiber and a waveform single-mode optical fiber in the distributed three-component acoustic wave sensing optical cable;
s6: modulating and demodulating back Rayleigh scattering light signals on a straight single-mode fiber and a waveform single-mode fiber by a ground three-component distributed optical fiber acoustic wave sensing (DAS) modulation and demodulation instrument, and demodulating optical fiber strain or strain rate data measured on the straight single-mode fiber into axial component acoustic wave data parallel to the axial direction of the underground optical fiber acoustic wave sensing array acoustic logging device; 2 paths of optical fiber strain or strain rate data measured by two waveform single-mode optical fibers on the upper side and the lower side of the square cylindrical elastic body are superposed in phase, and then are demodulated into south-north horizontal component acoustic wave data vertical to the axial direction of the underground optical fiber acoustic wave sensing array acoustic wave logging device; 2 paths of optical fiber strain or strain rate data measured by two waveform single-mode optical fibers on the left side surface and the right side surface of the square cylindrical elastic body are firstly superposed in phase and then demodulated into east-west horizontal component acoustic wave data vertical to the axial direction of the underground optical fiber acoustic wave sensing array acoustic wave logging device;
s7: firstly, sequentially exciting a monopole sound wave emission source, a quadrupole sound wave emission source and two mutually orthogonal dipole sound wave emission sources at the upper end of a dipole sound wave emission source, and collecting three-component sound wave signals from the stratum around a well hole by a distributed three-component sound wave sensing optical cable arranged at the upper part of the combined sound wave emission source;
s8: then, sequentially exciting a monopole sound wave emission source, a quadrupole sound wave emission source and two mutually orthogonal dipole sound wave emission sources at the lower end of the dipole sound wave emission source, and collecting three-component sound wave signals from the stratum around the well hole by a distributed three-component sound wave sensing optical cable arranged at the lower part of the combined sound wave emission source;
s9: calculating the average speed of stratum sound waves from the known combined sound wave emission source to each known sound wave detection point according to the travel time of direct sound waves from 1 monopole sound wave emission source, 2 mutually orthogonal dipole sound wave emission sources and 1 quadrupole sound wave emission source to each sound wave detection point on a distributed three-component sound wave sensing optical cable in the underground optical fiber sound wave sensing array sound wave logging device and the distance from the underground combined sound wave emission source to the known detection point;
if the travel time of the sound wave direct longitudinal wave is picked up by the data processing personnel, the calculated travel time is the average speed of the longitudinal wave of the stratum;
if the travel time of the sound waves directly reaching the transverse waves is picked up, the average speed of the transverse waves of the stratum is calculated;
s10: by recording multiple array acoustic logging curves of different acoustic emission sources and different source distances (distances between the emission sources and the receivers) to perform correlation and superposition processing, interference can be effectively suppressed, and various information of longitudinal waves, transverse waves and Stoneley waves can be accurately extracted. The distance between the receivers can be very small, so that the thin layer research requirement can be met;
s11: extracting longitudinal wave, transverse wave and Stoneley wave information of the formation of the open hole well by using a long source distance acoustic logging curve exceeding 8 feet; cement Bond Logging (CBL) is performed in a cased hole with a short source distance acoustic system of 3 feet, variable Density Logging (VDL) is performed with an acoustic system of 5 feet source distance, and these two measurements can be used to check the cased hole cement bond quality;
s12: through further processing and interpretation of the reflected acoustic signals (data), the distance and the orientation of a wave impedance interface from the borehole around the well control, the acoustic velocity of media on two sides of the wave impedance interface, the elastic parameter characteristics or viscoelastic parameter characteristics of the media on two sides, the lithology, porosity, permeability, types and saturation of fluids in the underground medium outside the borehole, and the distribution rule of different fluids in the underground medium can be obtained.
The invention has the beneficial effects that:
the invention provides a borehole three-component distributed optical fiber acoustic sensing array acoustic logging device, which uses a three-component distributed acoustic sensing optical cable to replace a monopole or dipole or multipole piezoelectric acoustic receiving transducer in the conventional array acoustic logging device. The instrument can completely collect array sound wave signals in a high-temperature deep well for a long time, the underground receiving sensor does not need any electronic device or circuit, and the difficult problem that the underground monopole or dipole or multipole piezoelectric sound wave receiving transducer, a high-cost amplifier, an analog-to-digital conversion and data storage device, an underground data transmission module and the like which are matched with the underground monopole or dipole or multipole piezoelectric sound wave receiving transducer cannot work at the high temperature for a long time is solved. Through the armored photoelectric composite cable connected with the optical fiber acoustic wave sensing array acoustic logging device, backward Rayleigh scattering optical signals in the three-component distributed acoustic wave sensing optical cable can be transmitted to a ground multichannel DAS modulation and demodulation instrument at a high speed, and the bottleneck problem that a large number of data signals collected by the underground optical fiber acoustic wave sensing array acoustic logging device are difficult to transmit upwards at a high speed is solved.
The invention can greatly reduce the manufacturing cost of the equipment for acquiring the three-component acoustic data underground, realize the high-efficiency acquisition of the three-component acoustic data underground with ultrahigh density or extremely high spatial resolution, can know the distance and the direction of a wave impedance interface around a well hole from the well hole, the acoustic velocity of media at two sides of the wave impedance interface, the elastic parameter characteristic or the viscoelastic parameter characteristic of the media at two sides, the lithology, the porosity, the permeability, the type and the saturation of the underground media around the well hole, the distribution rule of different fluids in the underground media by processing and analysis, and can also obtain the information of cracks and holes in the stratum around the well hole and the information of the stratum structure around the well hole, further know the directions, the inclination angles and the distribution of the cracks and the holes in the stratum and realize the wide popularization and application of the optical fiber array acoustic logging technology.
Drawings
FIG. 1 is a schematic diagram of the operation of a borehole three-component distributed fiber acoustic sensing array acoustic logging apparatus of the present invention;
FIG. 2 is a schematic structural diagram of an in-well three-component distributed optical fiber acoustic sensing array acoustic logging apparatus according to embodiment 1 of the present invention;
FIG. 3 is a schematic structural diagram of a three-component distributed acoustic wave sensing cable according to the present invention;
fig. 4 is a schematic structural diagram of an in-well three-component distributed optical fiber acoustic sensing array acoustic logging apparatus according to embodiment 2 of the present invention.
Description of reference numerals:
the acoustic logging device comprises 1-an optical fiber acoustic sensing array acoustic logging device, 2-a high-temperature-resistant armored photoelectric composite logging cable, 3-a ground wellhead logging truck, 4-a ground three-component distributed optical fiber acoustic sensing (DAS) modulation and demodulation instrument, 5-a distributed three-component acoustic sensing optical cable, 51-a square column-shaped elastomer, 52-a straight-shaped single mode fiber, 53-a waveform single mode fiber, 6-a combined acoustic emission source, 61-a monopole acoustic emission source, 62-a dipole acoustic emission source, 63-a quadrupole acoustic emission source, 7-a combined acoustic emission source circuit short circuit, 8-a sound insulator and 9-an optical fiber gyroscope.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", and the like indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, or that are conventionally placed when the product of the present invention is used, and are used only for convenience in describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "open," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention is explained in detail below with reference to the figures and with reference to embodiments:
the first embodiment is as follows:
as shown in fig. 1, the acoustic logging apparatus based on the borehole three-component distributed optical fiber acoustic wave sensing array comprises a borehole three-component distributed optical fiber acoustic wave sensing array acoustic logging apparatus 1, a high temperature resistant armored photoelectric composite logging cable 2, a ground wellhead logging truck 3, and a ground three-component distributed optical fiber acoustic wave sensing (DAS) modem 4;
as shown in fig. 2, the borehole three-component distributed optical fiber acoustic sensing array acoustic logging apparatus 1 system includes a high temperature resistant distributed three-component acoustic sensing optical cable 5 as a borehole three-component acoustic signal receiving unit; the monopole dipole quadrupole combined sound wave emission source 6 is in short circuit 7 with a combined sound wave emission source circuit, the sound insulator 8 is in short circuit, and the optical fiber gyroscope 9 is in short circuit; the ground wellhead logging truck 3 is connected with the in-well three-component distributed optical fiber acoustic wave sensing array acoustic logging device 1 through a high-temperature-resistant armored photoelectric composite logging cable 2;
the ground wellhead logging truck 3 controls the three-component distributed optical fiber acoustic wave sensing array acoustic logging device 1 in the well to go down and rise through the high-temperature-resistant armored photoelectric composite logging cable 2, provides 250V direct-current power supply for the optical fiber acoustic wave sensing array acoustic logging device 1 in the well, and drives the combined acoustic emission source circuit short circuit 7 and the combined acoustic emission source 6 to continuously and repeatedly emit acoustic signals during operation;
a ground three-component distributed optical fiber acoustic wave sensing (DAS) modulation and demodulation instrument 4 arranged at a wellhead is connected with a distributed three-component acoustic wave sensing optical cable 5 through a high-temperature-resistant armored photoelectric composite logging cable 2, emits laser pulses into the distributed three-component acoustic wave sensing optical cable 5, and synchronously collects backscattered Rayleigh waves in the distributed three-component acoustic wave sensing optical cable 5.
The ground three-component distributed optical fiber acoustic wave sensing (DAS) modem 4 is provided with five DAS data input ports and one optical fiber gyroscope 9 data input port.
As shown in fig. 3, the acoustic wave sensing optical cable is a distributed three-component acoustic wave sensing optical cable 5, the length of the acoustic wave sensing optical cable is between 3 meters and 5 meters, a square cylindrical elastic body 51 is arranged in the distributed three-component acoustic wave sensing optical cable 5, a high temperature resistant straight single mode fiber 52 is embedded in the center of the square cylindrical elastic body 51, four high temperature resistant bending or bending insensitive waveform single mode fibers 53 are laid on four sides of the square cylindrical elastic body 51 in a close and close manner according to sine waveforms or cosine waveforms, the extending surfaces of two high temperature resistant bending or bending insensitive waveform single mode fibers 53 on any two adjacent sides are perpendicular to each other, the tail ends of the straight single mode fiber 52 and the waveform single mode fiber 53 are provided with an extinction device 54, and the head ends of one straight single mode fiber 52 and four waveform single mode fibers 53 far from the extinction device 54 are respectively connected with the five DAS data input ports at the wellhead.
The optical fiber gyroscope 9, namely an optical fiber inertial navigation directional positioning system, is installed at the top end of the acoustic logging device 1 of the three-component distributed optical fiber acoustic sensing array in the well, and measures the direction, the inclination angle and the inclination of the acoustic logging device 1 of the array in real time through the high-temperature-resistant armored photoelectric composite logging cable 2. When the three-component distributed optical fiber acoustic wave sensing array acoustic logging device 1 in the well works, the optical fiber gyroscope 9 synchronously records the real-time position, speed and three-component attitude information of the underground optical fiber acoustic wave sensing array acoustic logging device 1. When the underground optical fiber acoustic sensing array acoustic logging device 1 is in communication connection with a multi-channel control and data acquisition subsystem in a ground logging truck 3, the underground optical fiber acoustic sensing array acoustic logging device 1 uploads actually measured underground three-component acoustic logging data to the ground control and data acquisition processing subsystem, and the optical fiber gyroscope 9 uploads the actually measured real-time position, speed and attitude information of the underground optical fiber acoustic sensing array acoustic logging device 1 to the ground control and data acquisition processing subsystem. The real-time position, speed and attitude information of the underground optical fiber acoustic sensing array acoustic logging device 1 recorded by the optical fiber gyroscope 9 in real time is used for positioning and orienting the three-component acoustic logging data in the well acquired by the system so as to identify the position and specific orientation of a wave impedance interface around the borehole and realize accurate and reliable detection of targets around the underground borehole.
The combined sound wave emission source circuit short circuit 7 is placed at the upper end of the optical fiber sound wave sensing array sound wave logging device 1 and used for driving a combined sound wave emission source 6in the optical fiber sound wave sensing array sound wave logging device 1, the combined sound wave emission source 6 is installed in the middle of the optical fiber sound wave sensing array sound wave logging device 1 and comprises two monopole sound wave emission sources 61, two mutually orthogonal dipole sound wave emission sources 62 and two quadrupole sound wave emission sources 63. Two monopole sound wave emission sources 61 are symmetrically arranged at two sides of two mutually orthogonal dipole sound wave emission sources 62, and two quadrupole sound wave emission sources 63 are respectively symmetrically arranged at two sides of the whole body formed by the two monopole sound wave emission sources 61.
Two sound insulators 8 are symmetrically arranged at two ends of the combined sound wave emission source 6 and used for blocking or blocking the direct coupling of the body wave energy of the combined sound wave emission source 6 to the distributed three-component sound wave sensing optical cable 5.
Two sections of distributed three-component sound wave sensing optical cables 5 with the same structure size are respectively arranged at two sides of two sound insulators 8 and are symmetrical to the combined sound wave emission source 6;
sequentially exciting a monopole sound wave emission source 61, a quadrupole sound wave emission source 63 and two mutually orthogonal dipole sound wave emission sources 62 at the upper end of the dipole sound wave emission source 62, and collecting three-component sound wave signals from the stratum around the well hole by a distributed three-component sound wave sensing optical cable 5 arranged at the upper part of the combined sound wave emission source 6;
then, a monopole sound wave emission source 61, a quadrupole sound wave emission source 63 and two mutually orthogonal dipole sound wave emission sources 62 at the lower end of the dipole sound wave emission source 62 are sequentially excited, and a distributed three-component sound wave sensing optical cable 5 arranged at the lower part of the combined sound wave emission source 6 collects three-component sound wave signals from the stratum around the well hole.
The measurement method of the array acoustic logging device 1 based on three-component distributed optical fiber acoustic sensing is characterized by comprising the following steps:
s1: connecting a high-temperature-resistant armored photoelectric composite logging cable 2 on a winch of a ground wellhead logging truck 3 with a borehole three-component distributed optical fiber acoustic wave sensing array acoustic logging device 1;
s2: lowering a three-component distributed optical fiber acoustic wave sensing array acoustic logging device 1 in a well to the bottom of the well by using a high-temperature-resistant armored photoelectric composite logging cable 2 on a winch of a ground wellhead logging truck 3;
s3: the underground optical fiber acoustic sensing array acoustic logging device 1 is lifted upwards at a low speed through a high-temperature-resistant armored photoelectric composite logging cable 2 on a winch of a ground wellhead logging truck 3, an instruction is sent to a combined acoustic emission source circuit short circuit 7 in the underground array acoustic logging device 1, two monopole acoustic emission sources 61, two dipole acoustic emission sources 62 and two quadrupole acoustic emission sources 63 in a combined acoustic emission source 6 are driven to sequentially excite acoustic signals;
s4: simultaneously starting the optical fiber gyroscope 9, and measuring and recording the direction, the inclination angle and the inclination of the array acoustic logging device 1 which is lifted upwards along the well track in real time;
s5: simultaneously starting a ground multichannel three-component distributed optical fiber acoustic wave sensing (DAS) modem 4, transmitting high-power multi-frequency narrow pulse laser signals to a distributed three-component acoustic wave sensing optical cable 5 in an underground optical fiber acoustic wave sensing array acoustic logging device 1 through a high-temperature-resistant armored photoelectric composite logging cable 2, and receiving backward Rayleigh scattering light signals on a straight single mode optical fiber 52 and a waveform single mode optical fiber 53 in the distributed three-component acoustic wave sensing optical cable 5;
s6: the ground three-component distributed optical fiber acoustic wave sensing (DAS) modem 4 carries out modem processing on backward Rayleigh scattering optical signals on a straight single mode optical fiber 52 and a waveform single mode optical fiber 53, and demodulates optical fiber strain or strain rate data measured on the straight single mode optical fiber 52 into axial component acoustic wave data parallel to the axial direction of the underground optical fiber acoustic wave sensing array acoustic wave logging device 1; two paths of optical fiber strain or strain rate data measured by two waveform single-mode optical fibers 53 on the upper side surface and the lower side surface of the square cylindrical elastic body 51 are firstly superposed in phase and then demodulated into south-north horizontal component acoustic wave data vertical to the axial direction of the underground optical fiber acoustic wave sensing array acoustic wave logging device 1; two paths of optical fiber strain or strain rate data measured by two waveform single-mode optical fibers 53 on the left side surface and the right side surface of the square cylindrical elastic body 51 are firstly superposed in phase and then demodulated into east-west horizontal component acoustic wave data vertical to the axial direction of the underground optical fiber acoustic wave sensing array acoustic wave logging device 1;
s7: firstly, sequentially exciting a monopole sound wave emission source 61, a quadrupole sound wave emission source 63 and two mutually orthogonal dipole sound wave emission sources 62 at the upper end of a dipole sound wave emission source 62, and collecting three-component sound wave signals from the stratum around a well hole by a distributed three-component sound wave sensing optical cable 5 arranged at the upper part of a combined sound wave emission source 6;
s8: then, a monopole sound wave emission source 61, a quadrupole sound wave emission source 63 and two mutually orthogonal dipole sound wave emission sources 62 at the lower end of the dipole sound wave emission source 62 are sequentially excited, and a distributed three-component sound wave sensing optical cable 5 arranged at the lower part of the combined sound wave emission source 6 collects three-component sound wave signals from the stratum around the well hole;
s9: calculating the average speed of the stratum sound wave from the known combined sound wave emission source 6 to each known sound wave detection point according to the travel time of the direct sound wave reaching each sound wave detection point on the distributed three-component sound wave sensing optical cable 5 in the underground optical fiber sound wave sensing array sound wave logging device 1 from the 1 monopole sound wave emission source 61, the two mutually orthogonal dipole sound wave emission sources 62 and the position of one quadrupole sound wave emission source 63 and the distance from the position of the underground combined sound wave emission source 6 to the known detection point;
if the travel time of the sound wave direct longitudinal wave is picked up by the data processing personnel, the calculated travel time is the average speed of the longitudinal wave of the stratum;
if the travel time of the sound waves directly reaching the transverse waves is picked up, the average speed of the transverse waves of the stratum is calculated;
s10: by recording multiple array acoustic logging curves of different acoustic emission sources and different source distances (distances between the emission sources and the receivers) to perform correlation and superposition processing, interference can be effectively suppressed, and various information of longitudinal waves, transverse waves and Stoneley waves can be accurately extracted. The distance between the receivers can be very small, so that the thin layer research requirement can be met;
s11: extracting longitudinal wave, transverse wave and Stoneley wave information of the formation of the open hole well by using a long source distance acoustic logging curve exceeding 8 feet; performing Cement Bond Logging (CBL) in a cased hole by using a short source distance acoustic system of 3 feet, and performing Variable Density Logging (VDL) by using an acoustic system with a source distance of 5 feet, wherein the two measurement results can be used for checking the cement bond quality of the cased hole;
s12: through further processing and interpretation of the reflected acoustic signals (data), the distance and the orientation of the wave impedance interface from the borehole around the well control, the acoustic velocity of the medium on both sides of the wave impedance interface, the elastic parameter characteristic or the viscoelastic parameter characteristic of the medium on both sides, the lithology, the porosity, the permeability, the type and the saturation of the fluid in the pores of the underground medium outside the borehole, and the distribution rule of different fluids in the underground medium can be obtained.
Example two:
as shown in fig. 4, the acoustic logging apparatus 1 based on the borehole three-component distributed optical fiber acoustic sensing array comprises a high temperature resistant distributed three-component acoustic sensing optical cable 5 arranged in the middle of the apparatus as a borehole three-component acoustic signal receiving unit; two groups of sound insulators 8 are respectively distributed on two sides of the distributed three-component sound wave sensing optical cable 5, two sets of monopole dipole and quadrupole combined sound wave emitting sources 6 which are completely the same are symmetrically distributed on the outer side of the whole formed by the two groups of sound insulators 8, and the combined sound wave emitting source short circuit 7 and the optical fiber gyroscope 9 are uniformly distributed on the top of the optical fiber sound wave sensing array sound wave logging device. When the acoustic logging device 1 based on the underground three-component distributed optical fiber acoustic wave sensing array operates, two sets of completely identical combined acoustic wave emission sources 6 at two ends of a distributed three-component acoustic wave sensing optical cable 5 are sequentially excited, and the distributed three-component acoustic wave sensing optical cable 5 sequentially receives downlink and uplink acoustic wave signals excited by the combined acoustic wave emission sources 6 from the top end of the device and the combined acoustic wave emission sources 6 from the bottom end of the device. Because two sets of completely identical combined sound wave emission sources 6 at the top end and the bottom end of the device are completely symmetrical to the distributed three-component sound wave sensing optical cable 5 in the middle of the device, the combined sound wave emission sources 6 comprise a monopole sound wave emission source 61, a quadrupole sound wave emission source 63 and two mutually orthogonal dipole sound wave emission sources 62 which are sequentially arranged towards the direction far away from the distributed three-component sound wave sensing optical cable 5. The downlink and uplink acoustic signals received and recorded by the distributed three-component acoustic sensing optical cable 5 in sequence can be superposed, so that the signal-to-noise ratio of array acoustic data acquired by the optical fiber acoustic sensing array acoustic logging device is improved.
Claims (10)
1. The acoustic logging device is characterized by comprising an in-well three-component distributed optical fiber acoustic sensing array acoustic logging device (1), a high-temperature-resistant armored photoelectric composite logging cable (2), a ground wellhead logging truck (3) and a ground three-component distributed optical fiber acoustic sensing (DAS) modulation and demodulation instrument (4);
the in-well three-component distributed optical fiber acoustic wave sensing array acoustic logging device (1) comprises a high-temperature-resistant distributed three-component acoustic wave sensing optical cable (5) serving as an in-well three-component acoustic signal receiving unit, a monopole dipole quadrupole combined acoustic emission source (6), a combined acoustic emission source circuit short circuit (7), a sound insulator (8) and an optical fiber gyroscope (9), and a ground wellhead logging truck (3) is connected with the in-well three-component distributed optical fiber acoustic wave sensing array acoustic logging device (1) through a high-temperature-resistant armored photoelectric composite logging cable (2);
the ground wellhead logging truck (3) controls the well descending and well ascending of the three-component distributed optical fiber acoustic wave sensing array acoustic logging device (1) in the well through the high-temperature-resistant armored photoelectric composite logging cable (2), provides a 250-volt direct-current power supply for the optical fiber acoustic wave sensing array acoustic logging device (1) in the well, and drives the combined acoustic emission source circuit short circuit (7) and the combined acoustic emission source (6) to continuously and repeatedly emit acoustic signals during operation;
a ground three-component distributed optical fiber acoustic wave sensing (DAS) modulation and demodulation instrument (4) arranged at a wellhead is connected with a distributed three-component acoustic wave sensing optical cable (5) through a high-temperature-resistant armored photoelectric composite logging cable (2), laser pulses are emitted into the distributed three-component acoustic wave sensing optical cable (5), and backscattered Rayleigh waves in the distributed three-component acoustic wave sensing optical cable (5) are synchronously collected.
2. A three-component distributed optical fiber acoustic wave sensing array acoustic logging apparatus according to claim 1, wherein said surface three-component distributed optical fiber acoustic wave sensing (DAS) modem instrument (4) has five DAS data input ports and one optical fiber gyroscope (9) data input port.
3. The acoustic logging device of claim 2, wherein the acoustic sensing optical cable is a distributed three-component acoustic sensing optical cable (5), the length of the acoustic sensing optical cable is between 3 meters and 5 meters, a square cylindrical elastic body (51) is arranged in the distributed three-component acoustic sensing optical cable (5), a high temperature resistant straight single mode fiber (52) is embedded in the center of the square cylindrical elastic body (51), four high temperature resistant bending or bending insensitive waveform single mode fibers (53) are laid on four sides of the square cylindrical elastic body (51) according to sine waveform or cosine waveform close facing, the extending surfaces of two high temperature resistant bending or bending insensitive waveform single mode fibers (53) on any two adjacent sides are all perpendicular to each other, an extinction device (54) is arranged at the tail ends of the straight single mode fiber (52) and the waveform single mode fiber (53), and the head ends of the straight single mode fiber (52) and the waveform single mode fiber (53) far away from the extinction device (54) are respectively connected with the five DAS data input ports at the well head.
4. The three-component distributed optical fiber acoustic sensing array acoustic logging apparatus according to claim 1, wherein the optical fiber gyroscope (9) is installed at the top end of the three-component distributed optical fiber acoustic sensing array acoustic logging apparatus (1) in a well, and measures the azimuth, inclination and inclination of the optical fiber acoustic sensing array acoustic logging apparatus (1) in real time through the high temperature resistant armored photoelectric composite logging cable (2).
5. The three-component distributed optical fiber acoustic wave sensing array acoustic logging device according to claim 1, wherein the combined acoustic wave emission source short circuit (7) is disposed at the upper end of the optical fiber acoustic wave sensing array acoustic logging device (1) and is used for driving the combined acoustic wave emission source (6) located in the middle of the optical fiber acoustic wave sensing array acoustic logging device (1), the combined acoustic wave emission source (6) comprises 2 monopole acoustic wave emission sources (61), 2 mutually orthogonal dipole acoustic wave emission sources (62), and two quadrupole acoustic wave emission sources (63), the 2 monopole acoustic wave emission sources (61) are respectively symmetrically installed at two sides of the 2 mutually orthogonal dipole acoustic wave emission sources (62), and the two quadrupole acoustic wave emission sources (63) are respectively symmetrically installed at two sides of the whole body formed by the 2 monopole acoustic wave emission sources (61).
6. A three-component distributed optical fiber acoustic wave sensing array acoustic logging apparatus according to claim 5, wherein two sound insulators (8) are symmetrically installed at two ends of the combined acoustic wave emission source (6) for blocking or blocking the direct coupling of the bulk wave energy of the combined acoustic wave emission source (6) to the distributed three-component acoustic wave sensing optical cable (5).
7. The acoustic logging device of three-component distributed optical fiber acoustic sensing array according to claim 6, wherein two distributed three-component acoustic sensing optical cables (5) with the same structural size are respectively arranged at two outer sides of the whole body formed by the two sound insulators (8) symmetrically to the combined acoustic emission source (6).
8. The three-component distributed optical fiber acoustic wave sensing array acoustic logging device according to claim 1, wherein a distributed three-component acoustic wave sensing optical cable (5) is arranged in the middle of the optical fiber acoustic wave sensing array acoustic logging device (1), two sets of sound insulators (8) are respectively arranged on two sides of the distributed three-component acoustic wave sensing optical cable (5), two sets of identical monopole dipole quadrupole combined acoustic emission sources (6) are symmetrically arranged on the outer side of the whole formed by the two sets of sound insulators (8), and the combined acoustic emission source circuit short circuit (7) and the optical fiber gyroscope (9) are uniformly arranged at the top of the optical fiber acoustic wave sensing array acoustic logging device (1).
9. A three-component distributed optical fiber acoustic sensing array acoustic logging apparatus as claimed in claim 8, wherein said combined acoustic emission source (6) comprises a monopole acoustic emission source (61), a quadrupole acoustic emission source (63) and two mutually orthogonal dipole acoustic emission sources (62) arranged in sequence in a direction away from the distributed three-component acoustic sensing cable (5).
10. The measuring method of the three-component distributed optical fiber acoustic wave sensing array acoustic wave logging device is characterized by comprising the following steps of:
s1: connecting a high-temperature-resistant armored photoelectric composite logging cable (2) on a winch of a ground wellhead logging truck (3) with a borehole three-component distributed optical fiber acoustic wave sensing array acoustic logging device (1);
s2: the three-component distributed optical fiber acoustic wave sensing array acoustic logging device (1) in the well is lowered to the bottom of the well by using a high-temperature-resistant armored photoelectric composite logging cable (2) on a winch of a ground wellhead logging truck (3);
s3: the method comprises the following steps that a high-temperature-resistant armored photoelectric composite logging cable (2) on a winch of a ground wellhead logging truck (3) is used for slowly and upwards lifting an underground optical fiber acoustic sensing array acoustic logging device (1) and sending an instruction to a combined acoustic emission source circuit short circuit (7) in the underground optical fiber acoustic sensing array acoustic logging device (1), two monopole acoustic emission sources (61) and two mutually orthogonal dipole acoustic emission sources (62) in the combined acoustic emission source (6) are driven, and two quadrupole acoustic emission sources (63) sequentially excite acoustic signals;
s4: simultaneously starting the optical fiber gyroscope (9), and measuring and recording the azimuth, the inclination angle and the inclination of the upward-lifted optical fiber acoustic wave sensing array acoustic logging device (1) along the well track in real time;
s5: simultaneously starting a ground three-component distributed optical fiber acoustic wave sensing (DAS) modem (4), transmitting high-power multi-frequency narrow pulse laser signals to a distributed three-component acoustic wave sensing optical cable (5) in an underground optical fiber acoustic wave sensing array acoustic logging device (1) through a high-temperature-resistant armored photoelectric composite logging cable (2), and simultaneously receiving backward Rayleigh scattering light signals on a straight single-mode optical fiber (52) and a waveform single-mode optical fiber (53) in the distributed three-component acoustic wave sensing optical cable (5);
s6: the modulation and demodulation instrument (4) of the ground three-component distributed optical fiber acoustic wave sensing (DAS) performs modulation and demodulation processing on backward Rayleigh scattering optical signals on a straight single mode optical fiber (52) and a waveform single mode optical fiber (53), and demodulates optical fiber strain or strain rate data measured on the straight single mode optical fiber (52) into axial component acoustic wave data parallel to the axial direction of the underground optical fiber acoustic wave sensing array acoustic logging device (1); 2 paths of optical fiber strain or strain rate data measured by two waveform single-mode optical fibers (53) on the upper side surface and the lower side surface of the square cylindrical elastic body (51) are subjected to in-phase superposition and then demodulated into south-north horizontal component acoustic wave data vertical to the axial direction of the underground optical fiber acoustic wave sensing array acoustic wave logging device (1); 2 paths of optical fiber strain or strain rate data measured by two waveform single-mode optical fibers (53) on the left side surface and the right side surface of a square cylindrical elastic body (51) are firstly superposed in phase and then demodulated into east-west horizontal component acoustic wave data vertical to the axial direction of the underground optical fiber acoustic wave sensing array acoustic wave logging device (1);
s7: firstly, sequentially exciting a monopole sound wave emission source (61), a quadrupole sound wave emission source (63) and two 2 mutually orthogonal dipole sound wave emission sources (62) which are positioned at the upper end of the dipole sound wave emission source (62), and collecting three-component sound wave signals from the stratum around a well hole by a distributed three-component sound wave sensing optical cable (5) arranged at the upper part of the combined sound wave emission source (6);
s8: then sequentially exciting a monopole sound wave emission source (61), a quadrupole sound wave emission source (63) and two 2 mutually orthogonal dipole sound wave emission sources (62) which are positioned at the lower end of the dipole sound wave emission source (62), and collecting three-component sound wave signals from the stratum around the well hole by a distributed three-component sound wave sensing optical cable (5) arranged at the lower part of the combined sound wave emission source (6);
s9: calculating the average velocity of stratum sound waves reaching each known sound wave detection point from the known combined sound wave emission source (6) according to the travel time of direct sound waves reaching each sound wave detection point on a distributed three-component sound wave sensing optical cable (5) in the underground optical fiber sound wave sensing array sound wave logging device (1) from the positions of 1 monopole sound wave emission source (61), 2 mutually-orthogonal dipole sound wave emission sources (62) and 1 quadrupole sound wave emission source (63) in the underground combined sound wave emission source (6) and the distance from the position of the underground combined sound wave emission source (6) to the known detection point;
if the travel time of the sound wave direct longitudinal wave is picked up by the data processing personnel, the calculated average speed of the formation longitudinal wave is obtained;
if the travel time of the sound wave directly reaching the transverse wave is picked up, the average speed of the formation transverse wave is calculated;
s10: by recording multiple array acoustic logging curves of different acoustic emission sources and different source distances (distances between the emission sources and the receivers) to carry out correlation and superposition processing, interference can be effectively suppressed, and various information of longitudinal waves, transverse waves and Stoneley waves of the stratum can be accurately extracted;
s11: extracting longitudinal wave, transverse wave and Stoneley wave information of the formation of the open hole well by using the long-source-distance acoustic logging curve of more than 8 feet; performing Cement Bond Logging (CBL) in a cased hole by using a short source distance acoustic system of 3 feet, and performing Variable Density Logging (VDL) by using an acoustic system with a source distance of 5 feet, wherein the two measurement results can be used for checking the cement bond quality of the cased hole;
s12: through further processing and interpretation of the reflected acoustic signals (data), the distance and orientation of the wave impedance interface from the borehole around the borehole, the acoustic velocity of the media on both sides of the wave impedance interface, the elastic or viscoelastic parameter properties of the media on both sides, and the lithology, porosity, permeability, type and saturation of the fluids in the subsurface media outside the borehole, as well as the distribution laws of the different fluids in the downhole media, can be determined.
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| CN117687077B (en) * | 2023-12-05 | 2024-05-03 | 光软(北京)科技有限责任公司 | Method and system for monitoring microseismic using a hybrid array of DAS and detectors |
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