An acoustic and electromagnetic probe co-located sleeve reservoir online monitoring method and system

Abstract

The present application relates to a kind of acoustic wave and electromagnetic probe co-located casing reservoir online monitoring method and system, comprising: establishing joint detection layered columnar model, the mechanism of joint detection of electromagnetic method and acoustic wave method is analyzed;Based on the analysis result, the structure of acoustic magnetic co-located probe is designed, and is arranged at different depths of the position to be detected;Acoustic magnetic co-located probe is used to emit acoustic wave signal and electromagnetic signal simultaneously, and corresponding receiver is used to receive, and multiple sets of test data are obtained;Multiple sets of test data are subjected to noise suppression and energy distribution is analyzed, the corresponding relationship between induced electromotive force and acoustic wave echo signal collected by acoustic magnetic co-located probe and each layer casing outer medium is determined, and acoustic electromagnetic casing reservoir joint interpretation result at the detection position is obtained.The present application can be widely applied in reservoir detection technical field.

Description

TECHNICAL FIELD

[0001] The application relates to a method and system for online monitoring of a post-casing reservoir by co-locating an acoustic wave and an electromagnetic probe, and belongs to the technical field of reservoir detection. BACKGROUND

[0002] High-porosity and high-permeability reservoirs have the characteristics of large reserves, good oil properties and high testing productivity. In the development process, the reservoirs have strong heterogeneity and the oil-water distribution is complex, and the water drive sweep range cannot be predicted. In order to better understand the downhole reservoir conditions and separate water and oil, the distribution of the reservoir needs to be accurately mastered in real time. Therefore, it is particularly important to perform long-term high-precision monitoring on the oil-water interface of the post-casing reservoir. The monitoring parameters of the existing production wells mainly include the characteristics of the fluid entering the wellbore, such as pressure, temperature, flow rate and oil, gas and water content. These parameters can be used to indirectly analyze the reservoir characteristics, but the main purpose of monitoring is to evaluate the productivity. Due to the influence of the production well casing, the post-casing formation resistivity, which is one of the most important physical quantities for evaluating the reservoir characteristics, is still a bottleneck for monitoring the post-casing reservoir.

[0003] The electromagnetic method for monitoring the resistivity of the outer formation has the technical principle that a transmitting coil is used to emit a periodic step pulse signal with a gap to the formation. When the pulse current is turned off, the receiving coil and the surrounding formation medium including the metal pipe will induce an alternating field, that is, a primary field signal. Subsequently, the induced eddy current of the primary field gradually diffuses in the form of a "smoke ring" to the interior of the medium, and a new electromagnetic field called a secondary field signal is excited on each medium interface due to the energy attenuation change. This excitation mode is mainly composed of high-frequency signal components in the early stage, which reflects the shallow geological information. In the late stage of the induced eddy current diffusion, the secondary field decays slowly and the signal is mainly a low-frequency component, which reflects the geological information of the deeper formation. Due to the time and space separability of the method, it has a wide application in reservoir detection. The electromagnetic method for monitoring the resistivity of the outer formation can separate and interpret the multi-layer medium including the casing, cement ring and formation layer by layer according to the diffusion time. However, due to the large volume ratio of the formation medium in the detection space, the strength of the formation response signal is stronger than that of the cement ring response signal. However, from the perspective of the detection distance, the cement ring is in front of the formation, and in this case, the transient electromagnetic method cannot effectively separate the cement ring when separating layer by layer, thereby greatly affecting the formation.

[0004] The technical principle of the through casing acoustic logging technology is to emit acoustic waves to the formation by using a cylindrical acoustic source, and to record the logging waveform by using a receiver. According to different time points of the casing wave, the formation wave, the cement sheath wave and the mud wave reaching the receiver, the radial interface separation and identification are realized. When the cementing quality is good, the acoustic wave through casing detection technology can perform layer-by-layer analysis on the casing wave, the cement sheath wave and the formation wave according to the acoustic wave echo. However, when the interface cementing is poor, it is difficult to observe the related information of the formation wave in the acoustic logging response.

[0005] The acoustic and electromagnetic combined logging technology uses the advantages of the electromagnetic method and the acoustic method to realize reservoir detection. However, the existing acoustic and electromagnetic combined detection instrument directly connects the electromagnetic detection module and the acoustic detection module in an up-down mode, which makes the two modules unable to obtain information of the same reservoir when the instrument position is fixed, and the working mode must be switched by moving to obtain the acoustic signal and the magnetic signal at the same position. Therefore, the instrument cannot realize permanent monitoring of the post-casing reservoir in the downhole. SUMMARY

[0006] In view of the above problems, the purpose of the present application is to provide a post-casing reservoir online monitoring method and system of acoustic and electromagnetic probe collocation, to realize long-term monitoring of the post-casing reservoir with high precision by designing a monitoring instrument of acoustic and electromagnetic probe collocation and multi-parameter joint interpretation of the received signal.

[0007] To achieve the above purpose, the present application adopts the following technical solutions:

[0008] In the first aspect, the present application provides a post-casing reservoir online monitoring method of acoustic and electromagnetic probe collocation, comprising the following steps:

[0009] Establishing a joint detection layered columnar model to analyze the joint detection mechanism of the electromagnetic method and the acoustic method;

[0010] Designing the structure of the acoustic and electromagnetic collocation probe based on the analysis results, and arranging it at different depths of the to-be-detected position;

[0011] Simultaneously emitting acoustic signals and electromagnetic signals by using the acoustic and electromagnetic collocation probe, and receiving them by using corresponding receivers to obtain a plurality of test data;

[0012] Performing noise suppression on the plurality of test data and analyzing the energy distribution to determine the corresponding relationship between the induced electromotive force and the acoustic echo signal collected by the acoustic and electromagnetic collocation probe and each layer of the out-of-casing medium, and obtaining the acoustic and electromagnetic post-casing reservoir joint interpretation result at the detection position.

[0013] Further, the method of establishing a joint detection layered columnar model to analyze the joint detection mechanism of the electromagnetic method and the acoustic method comprises:

[0014] A joint detection layered columnar model is established;

[0015] An electromagnetic method working mode of the joint detection layered columnar model is analyzed to obtain a relationship between a time-domain induced electromotive force of an electromagnetic receiving coil and resistivity information of a formation outside a casing;

[0016] An acoustic method working mode of the joint detection layered columnar model is analyzed to obtain a relationship between an acoustic echo signal and an interface characteristic of a medium outside the casing.

[0017] Further, the joint detection layered columnar model comprises:

[0018] A tubular column, packers, a plurality of production distributors and a plurality of test sub; The tubular column is arranged in the casing, and one of the packers is arranged at each of upper and lower ends of the tubular column at a reservoir position to be detected;

[0019] The test sub is provided with a sound-magnetic co-located probe, which comprises a sound wave transmitting probe, a sound wave receiving probe and an electromagnetic transmitting-receiving probe, and the electromagnetic transmitting-receiving probe is arranged between the sound wave transmitting probe and the sound wave receiving probe and comprises an electromagnetic transmitting coil and an electromagnetic receiving coil.

[0020] Further, the method for analyzing the electromagnetic method working mode of the joint detection layered columnar model to obtain the relationship between the time-domain induced electromotive force of the electromagnetic receiving coil and the resistivity information of the formation outside the casing comprises:

[0021] A bipolar wave excitation signal is generated by the electromagnetic transmitting coil, and an electromagnetic signal is collected by the electromagnetic receiving coil;

[0022] The electromagnetic signal collected by the electromagnetic receiving coil is processed to obtain an induced electromotive force of the electromagnetic receiving coil in a frequency domain;

[0023] The induced electromotive force of the electromagnetic receiving coil in the frequency domain is converted to a time domain by using an S-order G-S inverse Laplace transform to obtain the time-domain induced electromotive force of the electromagnetic receiving coil;

[0024] Based on the time-domain induced electromotive force of the electromagnetic receiving coil, the resistivity information of the formation outside the casing is inverted to obtain the resistivity information of the formation outside the casing.

[0025] Further, the time-domain induced electromotive force of the electromagnetic receiving coil is:

[0026]

[0027] wherein iω=sln2 / t, ω is an angular frequency of a transmitting signal; t and D srespectively, are the observation time and the integral coefficient of G-S inverse Laplace transform; z and d represent the axial and radial positions of the receiver, respectively, t of is the shut-in time.

[0028] Further, the method for analyzing the acoustic wave method working mode of the joint detection distribution columnar model, obtaining the relationship between the acoustic wave echo signal and the interface characteristics of the casing outer medium, comprises:

[0029] simplifying the acoustic source emitted by the acoustic wave emission probe into a point acoustic source, and determining all possible propagation paths from the acoustic wave emission probe to the acoustic wave receiving probe;

[0030] separating and identifying the radial interfaces of each layer of casing outer medium based on the acoustic wave echo signals received by the acoustic wave receiving probe at different times.

[0031] Further, the all possible propagation paths from the acoustic wave emission probe to the acoustic wave receiving probe include the following four kinds:

[0032] a. casing wave propagating along the casing;

[0033] b. cement ring wave propagating along the cement ring;

[0034] c. sliding longitudinal wave and sliding transverse wave propagating in the formation;

[0035] d. mud wave propagating directly through the mud.

[0036] Further, the method for performing noise suppression on the obtained multiple sets of test data, analyzing the energy distribution, determining the corresponding relationship between the induced electromotive force and the acoustic wave echo signal collected by the acoustic-magnetic co-located probe and each layer of casing outer medium, and obtaining the acoustic-electromagnetic casing post-reservoir joint interpretation result at the detection position, comprises:

[0037] performing noise suppression on the obtained multiple sets of test data and analyzing the energy distribution, and determining the corresponding relationship between the induced electromotive force and the acoustic wave echo signal collected by the acoustic-magnetic co-located probe and each layer of casing outer medium;

[0038] based on the corresponding induced electromotive force signal in each layer of casing outer medium, preliminarily dividing the radial information of each layer of casing outer medium, and obtaining the resistivity information of each layer of casing outer medium;

[0039] based on the preliminary division result of the radial information of each layer of casing outer medium, refining the radial information again by using the corresponding acoustic wave echo signal in each layer of casing outer medium, and obtaining the interface characteristics of each layer of casing outer medium.

[0040] In a second aspect, the present application provides a casing post-reservoir online monitoring system with acoustic wave and electromagnetic probe co-located, comprising:

[0041] The joint detection layered columnar model construction module is configured to establish a joint detection layered columnar model and analyze the joint detection mechanism of the electromagnetic method and the acoustic wave method.

[0042] The structural design module is configured to design the structure of the acoustic-magnetic co-located probe based on the analysis result.

[0043] The test module is configured to simultaneously emit acoustic wave signals and electromagnetic signals by using the acoustic-magnetic co-located probe, and receive the signals by using corresponding receivers to obtain a plurality of sets of test data.

[0044] The post-casing reservoir interpretation module is configured to perform noise suppression on the plurality of sets of test data, analyze the energy distribution, determine the corresponding relationship between induced electromotive force, acoustic wave echo signals and each layer of out-casing medium, and obtain a post-casing reservoir joint interpretation result at the detection position.

[0045] In a third aspect, the present application provides a processing device, which comprises at least a processor and a memory, and the memory stores a computer program, and the processor executes the computer program to implement the steps of the post-casing reservoir online monitoring method of the acoustic wave and electromagnetic probe co-located.

[0046] The present application has the following advantages due to the above technical solutions.

[0047] 1. The present application utilizes the principles and advantages of electromagnetic logging technology and acoustic logging technology to design an acoustic-magnetic co-located probe, which can realize permanent detection of post-casing reservoirs downhole, and can switch modes when the instrument position is fixed.

[0048] 2. In the present application, the acoustic wave transmitting probe and the acoustic wave receiving probe are respectively arranged at the two ends of the electromagnetic probe, and an integrated design structure is adopted, so that the information measured is the information of the same reservoir, and the reservoir information interpreted according to the test signals of the two methods is more accurate.

[0049] 3. The present application uses a multi-parameter joint interpretation method based on acoustic-magnetic signals to realize high-precision post-casing reservoir online monitoring, first divides a columnar layered model according to the properties of each layer of medium, and then further subdivides each layer of medium according to the detection echo time to improve the precision of post-casing reservoir monitoring.

[0050] Therefore, the present application can be widely applied to the field of oil reservoir detection technology. BRIEF DESCRIPTION OF DRAWINGS

[0051] 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 accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the application. Throughout the drawings, like reference numerals will be used to refer to like components. In the drawings:

[0052] Figure 1 is a reservoir online monitoring flow chart provided by the acoustic wave and electromagnetic probe co-located sleeve embodiment of the present application;

[0053] Figure 2 is a reservoir online monitoring method schematic diagram provided by the acoustic wave and electromagnetic probe co-located sleeve embodiment of the present application;

[0054] Figure 3 is a casing well acoustic wave transmitting and receiving schematic diagram provided by the sleeve embodiment of the present application;

[0055] Figure 4 is an acoustic wave and electromagnetic co-located probe structure schematic diagram provided by the sleeve embodiment of the present application;

[0056] Figure 5 is an electromagnetic and acoustic wave joint interpretation flow chart provided by the sleeve embodiment of the present application;

[0057] The reference signs in the drawings are as follows:

[0058] 1, sleeve; 2, cement sheath; 3, formation; 4, string; 5, packer; 6, proppant; 7, test nipple; 71, acoustic wave transmitting probe; 72, electromagnetic transmitting and receiving probe; 73, acoustic wave receiving probe; 74, transmitting circuit; 75, receiving circuit; 76, upper string joint; 77, lower string joint. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0060] It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0061] In some embodiments of the present application, a casing reservoir online monitoring method with acoustic wave and electromagnetic probe co-located is provided. A joint detection layered columnar model is established to analyze the joint detection mechanism of electromagnetic method and acoustic wave method, and the structural design and circuit design of acoustic-magnetic co-located probe are realized. Then, the acoustic wave signal and electromagnetic signal are simultaneously transmitted by using the acoustic-magnetic co-located probe, and are received by using the corresponding receiver, and a plurality of test and signal collection are completed. The received signal is subjected to noise suppression and energy distribution analysis, the corresponding relationship between induced electromotive force and acoustic wave echo signal and each layer casing outer medium is determined, and the acoustic wave electromagnetic casing reservoir joint interpretation method under this mode is proposed.

[0062] Correspondingly, in some other embodiments of the present application, a casing reservoir online monitoring system with acoustic wave and electromagnetic probe co-located is provided.

[0063] Embodiment 1

[0064] As shown in Figure 1 , the present embodiment provides a casing reservoir online monitoring method with acoustic wave and electromagnetic probe co-located, which comprises the following steps:

[0065] 1) A joint detection layered columnar model is established to analyze the joint detection mechanism of electromagnetic method and acoustic wave method;

[0066] 2) Based on the analysis result, the structure of acoustic-magnetic co-located probe is designed and arranged at different depths of the to-be-detected position;

[0067] 3) The acoustic wave signal and electromagnetic signal are simultaneously transmitted by using the acoustic-magnetic co-located probe, and are received by using the corresponding receiver, and a plurality of test data are obtained;

[0068] 4) The plurality of test data are subjected to noise suppression and energy distribution analysis, the corresponding relationship between induced electromotive force and acoustic wave echo signal collected by the acoustic-magnetic co-located probe and each layer casing outer medium is determined, and the acoustic wave electromagnetic casing reservoir joint interpretation result at the detection position is obtained.

[0069] Preferably, the above step 1) can be realized by the following steps:

[0070] 1.1) A joint detection layered columnar model is established.

[0071] 1.2) The electromagnetic method working mode of the joint detection distribution columnar model is analyzed to obtain the relationship between the induced electromotive force of electromagnetic receiving coil time domain and the casing outer formation resistivity information.

[0072] 1.3) The acoustic wave method working mode of the joint detection distribution columnar model is analyzed to obtain the relationship between the acoustic wave echo signal and the interface characteristics of the casing outer medium.

[0073] Preferably, in the above step 1.1), as Figure 2As shown, the joint detection layered columnar model established in the embodiment includes a pipe column 4, packers 5, several production allocators 6 and several test splices 7. The pipe column 4 is arranged in the casing 1, and one packer 5 is arranged at the upper and lower ends of the pipe column at the to-be-detected reservoir position (i.e., layer 2). Each production allocator 6 is arranged on the pipe column 4 between the two packers 5, and each production allocator 6 is provided with a test splice for monitoring the to-be-detected reservoir position. In the detection process, the packer 5 is used to fix the test splice 7 at the to-be-detected reservoir position, the test splice 7 is used to monitor the to-be-detected reservoir, and after the reservoir productivity evaluation is completed, the production allocator is used for production. Layers 1 and 3 are conventional strata.

[0074] The test splice 7 is provided with a sound-magnetic co-located probe, which includes a sound wave emitting probe, a sound wave receiving probe and an electromagnetic transmitting-receiving probe, and the electromagnetic transmitting-receiving probe is arranged between the sound wave emitting probe and the sound wave receiving probe, and includes an electromagnetic transmitting coil and an electromagnetic receiving coil.

[0075] Preferably, the above step 1.2) can be realized by the following steps:

[0076] 1.2.1) A bipolar wave excitation signal is generated by the electromagnetic transmitting coil, and an electromagnetic signal is collected by the electromagnetic receiving coil.

[0077] 1.2.2) The electromagnetic signal collected by the electromagnetic receiving coil is processed to obtain the induced electromotive force of the electromagnetic receiving coil in the frequency domain.

[0078] According to the Maxwell equations, a magnetic vector A is introduced, and the non-homogeneous and homogeneous Helmholtz equations can be written as:

[0079]

[0080]

[0081] In the formula, k k j , μ j , σ j and ε j are the propagation coefficient, magnetic permeability, electrical conductivity and relative permittivity of the j-th layer medium in the radial direction; ω is the angular frequency of the transmitted signal, J e represents an electric field source; and A j is the magnetic potential of the j-th layer medium.

[0082] Solving the formula (1) and the formula (2), the induced electromotive force of the electromagnetic receiving coil in the frequency domain is:

[0083]

[0084] where z and d represent the axial and radial position of the receiver, respectively, r is the distance between the observation point and the electric field source J e , μ1is the permeability of the first layer of medium, N R is the number of turns of the receiving coil, r1is the radius of the transmitting coil, H z1 is the primary magnetic field generated by the transmitting coil.

[0085] 1.2.3) Convert the induced electromotive force of the electromagnetic receiving coil in the frequency domain to the time domain by using the S-order G-S inverse Laplace transform to obtain the induced electromotive force of the electromagnetic receiving coil in the time domain.

[0086] By applying a bipolar ramp step signal to the electromagnetic transmitting coil, assuming that the turn-off time of the transmitting coil is t of , the above formula is converted from the frequency domain to the time domain by using the S-order G-S inverse Laplace transform, and the induced electromotive force of the electromagnetic receiving coil in the time domain is

[0087]

[0088] where iω = sln2 / t, t and D s are the observation time and the integral coefficient of the G-S inverse Laplace transform, respectively, and t of is the turn-off time.

[0089] 1.2.4) Based on the induced electromotive force of the electromagnetic receiving coil in the time domain, the resistivity information of the out-sleeve formation is inverted to obtain the resistivity information of the out-sleeve formation.

[0090] Since the conductivity of the instrument sleeve is fixed, and the conductivity of the well fluid, cement sheath and formation is much smaller than that of the metal sleeve. Therefore, the resistivity information of the out-sleeve formation can be inverted by the induced electromotive force of the electromagnetic receiving coil in the time domain.

[0091] Preferably, in the above step 1.3), since the sound waves emitted by the cylindrical sound source have a certain directivity, the sound wave energy (sound pressure) distribution map can be made in space or plane, which is called sound source directivity characteristic petal diagram. The direction with the maximum sound pressure value is defined as the P-axis direction, and the included angle between the two directions with the sound pressure or amplitude of 70% (-3dB) of the maximum sound pressure value is defined as the beam angle. It is an important parameter to represent the directivity characteristics of the sound source, and its size is determined by the vibration mode of the transducer. In numerical simulation, the cylindrical sound source is usually simplified as a point sound source. From the transmitter to the receiver, there are four possible ways:

[0092] a. Sleeve wave propagating along the sleeve;

[0093] b. Cement sheath wave propagating along the cement sheath;

[0094] c. Sliding longitudinal wave and sliding transverse wave propagating in the formation;

[0095] d. Mud wave propagating directly through the mud.

[0096] In these pathways, the casing wave reaches the receiver first, followed by the formation wave and the cement sheath wave, and the mud wave reaches the receiver last. Therefore, the characteristics of the acoustic wave through the casing can be used for data interpretation.

[0097] Preferably, in the above step 2), since the conventional acoustic-magnetic composite probe adopts the structure of the electromagnetic probe and the acoustic wave probe being connected in an up-down mode, that is, the conventional acoustic-magnetic composite probe adopts the mode of the electromagnetic probe being on the top and the acoustic wave probe being on the bottom or the acoustic wave probe being on the top and the electromagnetic probe being on the bottom, the electromagnetic probe and the acoustic wave probe are independent of each other, and the signals measured by the two methods need to be compensated for each other before being used to interpret the information of a specific reservoir position; moreover, in the monitoring process, the conventional acoustic-magnetic composite probe cannot switch the mode when the position of the instrument is fixed. In order to use the electromagnetic acoustic wave to conduct long-term joint monitoring of the fixed position, the electromagnetic probe and the acoustic wave probe are co-located in the embodiment. That is, the acoustic wave transmitting probe and the acoustic wave receiving probe are respectively arranged at the two ends of the electromagnetic probe, an integrated design structure is adopted, the information measured is the information of the same reservoir, and the reservoir information interpreted according to the test signals of the two methods is more accurate.

[0098] As shown in Figure 4 The acoustic-magnetic co-located probe provided by the embodiment includes an acoustic wave transmitting probe 71, an acoustic wave receiving probe 73, an electromagnetic probe 72, a transmitting circuit 74 and a receiving circuit 75 arranged in a shell. The transmitting circuit 74 and the receiving circuit 75 are connected with the acoustic wave transmitting probe 71 and the acoustic wave receiving probe 73 through connecting lines respectively, and are used for transmitting or receiving acoustic wave signals; the electromagnetic probe 72 is arranged between the acoustic wave transmitting probe 71 and the acoustic wave receiving probe 73, and is connected with the acoustic wave transmitting probe 71 and the acoustic wave receiving probe 72 through connecting lines; and the two ends of the shell are connected with a pipe string 4 through an upper pipe string joint 76 and a lower pipe string joint 77 respectively.

[0099] Preferably, in the above step 4), based on the above analysis, the transient electromagnetic method uses the eddy current diffusion principle, and can separate and interpret the multi-layer medium including the casing, the cement sheath and the formation layer by layer according to the diffusion time model. However, since the volume of the formation medium in the detection range accounts for the vast majority, the strength of the formation response signal is stronger than that of the cement sheath response signal, which leads to the fact that the cement sheath cannot be effectively stripped when separated layer by layer, thereby greatly affecting the formation. In view of this problem, the acoustic wave and the electromagnetic wave are combined in the application, the characteristics that the acoustic wave through the casing can clearly distinguish the first cement interface and the second cement interface are used, and the downhole multi-parameter joint interpretation model is researched.

[0100] As shown in Figure 5As shown in the above multi-parameter joint interpretation method, the electromagnetic method and the acoustic wave method are both characteristics of radial layering identification of the casing outside medium, and the layered resistivity is compared with the physical parameters such as the formation porosity and the Poisson's ratio measured by the acoustic wave to jointly interpret the casing outside medium at different radial distances. Specifically, the following steps are included:

[0101] 4.1) Noise suppression is performed on the obtained multiple sets of test data, and energy distribution analysis is performed to determine the corresponding relationship between the induced electromotive force and the acoustic wave echo signal collected by the acoustic-magnetic co-located probe and each layer of casing outside medium;

[0102] 4.2) Based on the corresponding induced electromotive force signal in each layer of casing outside medium, the radial information of each layer of casing outside medium is preliminarily divided to obtain the resistivity information of each layer of casing outside medium;

[0103] 4.3) Based on the preliminary division result of the radial information of each layer of casing outside medium in step 4.2), the radial information is further refined using the corresponding acoustic wave echo signal in each layer of casing outside medium to obtain the interface characteristics of each layer of casing outside medium, including porosity ψ1, Poisson's ratio σ1 and cementation coefficient.

[0104] Embodiment 2

[0105] The above embodiment 1 provides a casing behind reservoir online monitoring method of acoustic wave and electromagnetic probe co-located, and correspondingly, the present embodiment provides a casing behind reservoir online monitoring system of acoustic wave and electromagnetic probe co-located. The system provided by the present embodiment can implement the casing behind reservoir online monitoring method of acoustic wave and electromagnetic probe co-located in embodiment 1. The system can be realized by software, hardware or a combination of software and hardware. For example, the system can include integrated or separate functional modules or functional units to perform the corresponding steps in each method of embodiment 1. Since the system of the present embodiment is basically similar to the method embodiment, the description process of the present embodiment is relatively simple, and the related parts can be referred to the part of the description of embodiment 1. The system provided by the present embodiment is only schematic.

[0106] The casing behind reservoir online monitoring system of acoustic wave and electromagnetic probe co-located provided by the present embodiment comprises:

[0107] The joint detection layered columnar model construction module is used to establish a joint detection layered columnar model and analyze the joint detection mechanism of electromagnetic method and acoustic wave method.

[0108] The structural design module is used to design the structure of the acoustic-magnetic co-located probe based on the analysis result.

[0109] The test module is used to simultaneously emit acoustic wave signals and electromagnetic signals by using the acoustic-magnetic co-located probe, and receive the signals by using the corresponding receiver to obtain multiple sets of test data.

[0110] The post-casing reservoir interpretation module is configured to perform noise suppression on the multiple sets of test data and analyze energy distribution, determine the corresponding relationship between the induced electromotive force and the acoustic echo signal and the out-of-casing medium of each layer, and obtain the acoustic and electromagnetic post-casing reservoir joint interpretation result at the detection position.

[0111] Embodiment 3

[0112] The embodiment provides a processing device corresponding to the online monitoring method of the post-casing reservoir provided in the embodiment 1, and the processing device can be a processing device for a client, such as a mobile phone, a notebook computer, a tablet computer, a desktop computer, etc., to execute the method of the embodiment 1.

[0113] The processing device includes a processor, a memory, a communication interface and a bus, and the processor, the memory and the communication interface are connected through the bus to complete the communication among each other. The memory stores a computer program capable of running on the processor, and the processor executes the online monitoring method of the post-casing reservoir provided in the embodiment 1 when running the computer program.

[0114] In some embodiments, the memory can be a high-speed random access memory (RAM), and can also include a non-volatile memory, such as at least one disk memory.

[0115] In other embodiments, the processor can be a central processing unit (CPU), a digital signal processor (DSP) or various types of general-purpose processors, which are not limited here.

[0116] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for online monitoring of a reservoir behind a casing using a co-located acoustic wave and electromagnetic probe, characterized in that The following steps are involved: Establish a joint detection layered columnar model to analyze the joint detection mechanism of electromagnetic and acoustic methods; Based on the analysis results, the structure of the acoustic and magnetic co-located probe is designed and arranged at different depths of the location to be detected; The acoustic and electromagnetic signals are transmitted simultaneously by using an acoustic and magnetic co-located probe, and are received by corresponding receivers to obtain multiple sets of test data; By performing noise suppression on multiple test data sets and analyzing their energy distribution, the corresponding relationship between the induced electromotive force and acoustic echo signals collected by the acoustic-magnetic co-located probes and the outer casing medium of each layer is determined, and the joint interpretation results of the acoustic-electromagnetic back-casing reservoir at the detection location are obtained; The acoustic-magnetic co-located probe includes an acoustic wave transmitting probe, an acoustic wave receiving probe, an electromagnetic probe, a transmitting circuit, and a receiving circuit arranged in a shell; the transmitting circuit and the receiving circuit are respectively connected to the acoustic wave transmitting probe and the acoustic wave receiving probe via connecting wires for transmitting or receiving acoustic wave signals; the electromagnetic probe is arranged between the acoustic wave transmitting probe and the acoustic wave receiving probe, and is connected to the acoustic wave transmitting probe and the acoustic wave receiving probe via connecting wires; the two ends of the shell are respectively connected to the pipe string via an upper pipe string joint and a lower pipe string joint; The method of suppressing noise and analyzing energy distribution of multiple sets of test data, determining the corresponding relationship between the induced electromotive force and acoustic echo signals collected by the acoustic-magnetic co-located probe and the outer medium of each layer, and obtaining the acoustic-electromagnetic post-casing reservoir joint interpretation result at the detection position, includes: The noise of the multiple test data sets obtained is suppressed and the energy distribution is analyzed to determine the corresponding relationship between the induced electromotive force and acoustic wave echo signals collected by the acoustic and magnetic co-located probes and the outer medium of each layer; Based on the corresponding induced electromotive force signal in each layer of the outer shell medium, the radial information of each layer of the outer shell medium is preliminarily divided to obtain the resistivity information of each layer of the outer shell medium; Based on the preliminary division results of the radial information of each layer of the outer medium, the radial information is further refined using the corresponding acoustic echo signal in each layer of the outer medium to obtain the interface characteristics of each layer of the outer medium.

2. The method for online monitoring of a reservoir behind a casing using a co-location of an acoustic wave and an electromagnetic probe according to claim 1, characterized in that: The method of establishing a joint detection layered columnar model to analyze the joint detection mechanism of the electromagnetic method and the acoustic wave method includes: Establish a joint detection hierarchical columnar model; The electromagnetic working mode of the joint detection distributed columnar model is analyzed to obtain the relationship between the induced electromotive force of the electromagnetic receiving coil in the time domain and the resistivity information of the outer formation; The working mode of the acoustic wave method of the joint detection distributed columnar model is analyzed, and the relationship between the acoustic wave echo signal and the interface characteristics of the outer medium of the casing is obtained.

3. The method for online monitoring of a reservoir behind a casing using a co-location of an acoustic wave and an electromagnetic probe as claimed in claim 2, characterized in that: The joint detection hierarchical columnar model includes: A tubing string, a packer, several production distribution devices and several test short sections; the tubing string is set in the casing, and a packer is set at the upper and lower ends of the tubing string located at the reservoir position to be measured; each of the production distribution devices is spaced apart on the tubing string between two of the packers, and each of the production distribution devices is provided with a test short section for monitoring the reservoir position to be measured; An acoustic-magnetic co-located probe is provided in the test sub, which includes an acoustic wave transmitting probe, an acoustic wave receiving probe and an electromagnetic transceiver probe. The electromagnetic transceiver probe is provided between the acoustic wave transmitting probe and the acoustic wave receiving probe, and includes an electromagnetic transmitting coil and an electromagnetic receiving coil.

4. The method for online monitoring of a reservoir behind a casing using a co-location of an acoustic wave and an electromagnetic probe as claimed in claim 3, characterized in that: The method of analyzing the electromagnetic method working mode of the joint detection distributed columnar model to obtain the relationship between the induced electromotive force of the electromagnetic receiving coil in the time domain and the resistivity information of the outer formation includes: A bipolar wave excitation signal is generated by an electromagnetic transmitting coil, and an electromagnetic signal is collected by an electromagnetic receiving coil; Processing the electromagnetic signal collected by the electromagnetic receiving coil to obtain the induced electromotive force in the frequency domain of the electromagnetic receiving coil; use S The induced electromotive force of the electromagnetic receiving coil in the frequency domain is converted to the time domain by the GS inverse Laplace transform, and the induced electromotive force of the electromagnetic receiving coil in the time domain is obtained; Based on the induced electromotive force of the electromagnetic receiving coil in the time domain, the resistivity information of the outer formation is inverted to obtain the outer formation resistivity information.

5. The method for online monitoring of a reservoir behind a casing using a co-location of an acoustic wave and an electromagnetic probe as claimed in claim 4, characterized in that: The induced electromotive force of the electromagnetic receiving coil in the time domain is: in, , is the angular frequency of the transmitted signal; and are the observation time and the integral coefficient of the GS inverse Laplace transform, respectively; and denote the axial and radial positions of the receiver, respectively, t of is the off time.

6. The method for online monitoring of a reservoir behind a casing using a co-location of an acoustic wave and an electromagnetic probe as claimed in claim 3, characterized in that: The method of analyzing the working mode of the acoustic wave method of the joint detection distributed columnar model to obtain the relationship between the acoustic wave echo signal and the interface characteristics of the outer medium of the casing includes: Simplify the sound source emitted by the acoustic wave transmitting probe into a point sound source, and determine all possible propagation paths from the acoustic wave transmitting probe to the acoustic wave receiving probe; Based on the different moments of the acoustic echo signals received by the acoustic wave receiving probe, the radial interfaces of the outer media of each layer are separated and identified.

7. The method for online monitoring of a reservoir behind a casing using a co-location of an acoustic wave and an electromagnetic probe as claimed in claim 6, characterized in that: All possible propagation paths from the acoustic wave transmitting probe to the acoustic wave receiving probe include the following four: a. Casing waves propagating along the casing; b. Cement ring waves propagating along the cement ring; c. Sliding longitudinal waves and sliding transverse waves propagating in the stratum; d. Mud waves that propagate directly through mud.

8. An online monitoring system for a reservoir behind a casing with acoustic wave and electromagnetic probes co-located, characterized in that: include: Joint detection layered columnar model construction module, used to establish a joint detection layered columnar model and analyze the joint detection mechanism of electromagnetic and acoustic methods; Structural design module, used to design the structure of the acoustic-magnetic co-located probe based on the analysis results; The test module is used to use the acoustic and magnetic co-located probe to simultaneously transmit acoustic signals and electromagnetic signals, and use corresponding receivers to receive them to obtain multiple sets of test data; The post-casing reservoir interpretation module is used to suppress noise and analyze energy distribution of multiple test data sets, determine the corresponding relationship between the induced electromotive force and acoustic echo signal and the outer medium of each layer, and obtain the joint interpretation results of acoustic and electromagnetic post-casing reservoirs at the detection location; The acoustic-magnetic co-located probe includes an acoustic wave transmitting probe, an acoustic wave receiving probe, an electromagnetic probe, a transmitting circuit, and a receiving circuit arranged in a shell; the transmitting circuit and the receiving circuit are respectively connected to the acoustic wave transmitting probe and the acoustic wave receiving probe via connecting wires for transmitting or receiving acoustic wave signals; the electromagnetic probe is arranged between the acoustic wave transmitting probe and the acoustic wave receiving probe, and is connected to the acoustic wave transmitting probe and the acoustic wave receiving probe via connecting wires; the two ends of the shell are respectively connected to the pipe string via an upper pipe string joint and a lower pipe string joint; The method of suppressing noise and analyzing energy distribution of multiple sets of test data, determining the corresponding relationship between the induced electromotive force and acoustic echo signals collected by the acoustic-magnetic co-located probe and the outer medium of each layer, and obtaining the acoustic-electromagnetic post-casing reservoir joint interpretation result at the detection position includes: The noise of the multiple test data sets obtained is suppressed and the energy distribution is analyzed to determine the corresponding relationship between the induced electromotive force and acoustic wave echo signals collected by the acoustic and magnetic co-located probes and the outer medium of each layer; Based on the corresponding induced electromotive force signal in each layer of the outer shell medium, the radial information of each layer of the outer shell medium is preliminarily divided to obtain the resistivity information of each layer of the outer shell medium; Based on the preliminary division results of the radial information of each layer of the outer medium, the radial information is further refined using the corresponding acoustic echo signal in each layer of the outer medium to obtain the interface characteristics of each layer of the outer medium.

9. A processing device, comprising at least a processor and a memory, wherein a computer program is stored in the memory, wherein: When the processor runs the computer program, the processor executes the steps of the method for online monitoring of a reservoir behind the casing with the acoustic wave and electromagnetic probe co-located as claimed in any one of claims 1 to 7.

Images