Double-sound-wave underground leakage point positioning system and method for carbon dioxide gas injection well

Abstract

The invention discloses a dual-sound-wave underground leakage point positioning system and method for a carbon dioxide gas injection well. The oil pipe leakage sound wave detection module, the liquid level detection module and the portable multi-component gas detection module are used for detecting the leakage position of an oil pipe of a carbon dioxide gas injection well, detecting the liquid level of the oil pipe or a sleeve and detecting gas components in the oil pipe or the sleeve. An oil pipe liquid level detection result can provide parameter supplement for oil pipe leakage position detection data explanation, and a gas component detection result in an oil pipe or a sleeve can provide data support for solving wellhead sound velocity in the oil pipe or the sleeve. And the leakage position of the underground oil pipe can be accurately positioned.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of carbon dioxide injection well leakage detection, and particularly relates to a double acoustic wave downhole leakage point positioning system and method for a carbon dioxide injection well. BACKGROUND

[0002] Carbon dioxide flooding and storage (CCUS-EOR) can greatly improve oilfield recovery and achieve large-scale carbon sequestration, which is a key technical means to ensure national energy security and a bottom technology guarantee to achieve the "double carbon" goal. During the injection process of the carbon dioxide injection well, due to the high pressure of the injected fluid, the acidic corrosion conditions of carbon dioxide, and other factors, the tubing hanger, tubing thread, and packer, and other string sealing components are prone to leakage, which can easily cause sustained pressure in the annulus and corrosion of the oil casing, posing a threat to production safety and having a negative impact on the long-term service performance of the string. Precise positioning of the downhole tubing leakage location is a prerequisite for leakage evaluation and safety control.

[0003] The existing gas production well ground acoustic wave string leakage detection technology mainly installs acoustic wave sensors in the tubing and casing annulus to collect leakage acoustic wave signals in the annulus. However, most of the carbon dioxide injection well annulus contains annulus protection fluid of unknown depth. When the casing four-way junction wellhead device is disassembled to install acoustic wave sensors and collect acoustic wave data to release the annulus pressure, the annulus protection fluid may return and contaminate the acoustic wave sensors, causing the sensors to fail. The existing acoustic wave sensors use high-sensitivity diaphragms to sense the pressure movement in a sealed space (micro-pascal order), so the acoustic wave sensors used in the existing tubing leakage acoustic wave positioning technology have high requirements for wellhead detection conditions and are only suitable for oil and gas wells without annulus protection fluid returning to the annulus.

[0004] In summary, it is particularly important to design a tubing leakage acoustic wave positioning method and system that does not contaminate the sensors and is accurate. SUMMARY

[0005] The present application aims to provide a double acoustic wave downhole leakage point positioning system and method for a carbon dioxide injection well, which is used for tubing leakage location detection and tubing (or casing) liquid level detection in a carbon dioxide injection well. The tubing liquid level detection result can provide parameter supplementation for tubing leakage location detection data interpretation, i.e., accurately providing the liquid level position in the tubing. The gas component detection result in the tubing (or casing) can provide data support for solving the wellhead acoustic velocity in the tubing (or casing), i.e., determining the acoustic velocity of the wellhead tubing (or casing) mixture according to the corresponding experimental data or theoretical formula, which ensures the data accuracy during liquid level and leakage location calculation. Therefore, the present application system can accurately position the downhole tubing (or casing) liquid level and tubing leakage location in a carbon dioxide injection well.

[0006] A dual acoustic wave downhole leakage point positioning method for carbon dioxide injection wells, comprising the following steps:

[0007] S1, using a liquid level detection module, collecting tubing and / or casing wellhead temperature, pressure, acoustic wave signals, obtaining the liquid level position in the tubing and / or casing; the liquid level detection step includes: first, inflate the tubing, collect temperature, pressure and acoustic wave signals, and then obtain the echo signal.

[0008] S2, using a tubing leakage acoustic wave detection module, collecting tubing wellhead temperature, pressure, acoustic wave signals, obtaining tubing leakage position; the leakage acoustic wave detection step includes: opening the casing valve to release pressure, generating pressure difference between the tubing and the casing, collecting temperature, pressure and acoustic wave signals.

[0009] In the method, mainly using carbon dioxide injection wells in the state of shutting down injection, carbon dioxide in the tubing and reservoir fluid reach pressure balance after stable liquid level can appear; first, inflate the tubing of the injection well to a certain position, then obtain the liquid level position of the tubing through the liquid level detection module, and the liquid level position can provide support for subsequent tubing leakage detection; and in the tubing leakage detection, first, release the pressure, then collect temperature, pressure and acoustic wave signals after a certain pressure difference between the tubing and the casing, on the one hand, to avoid liquid pollution of the acoustic wave sensor, on the other hand, to ensure the accuracy of the detection.

[0010] Another dual acoustic wave downhole leakage point positioning method for carbon dioxide injection wells, comprising the following steps:

[0011] S101, collecting tubing and / or casing wellhead gas through a portable multi-component gas detection module, obtaining the fluid medium components in the tubing and / or casing, and obtaining the tubing and / or casing wellhead sound velocity through the fluid medium components;

[0012] S102, using a liquid level detection module, collecting tubing and / or casing wellhead temperature, pressure, acoustic wave signals, obtaining the liquid level position in the tubing and / or casing through the collected tubing and / or casing wellhead temperature, pressure, acoustic wave signals and the tubing and / or casing wellhead sound velocity obtained from S101, the liquid level detection step includes: first, inflate the tubing, collect temperature, pressure and acoustic wave signals, then pressurize and release through the liquid level detection module, and obtain the echo signal;

[0013] S103, using a tubing leakage acoustic wave detection module, collecting tubing wellhead temperature, pressure, acoustic wave signals, obtaining tubing leakage position through the collected tubing and / or casing wellhead temperature, pressure, acoustic wave signals and the tubing wellhead sound velocity obtained from S101, the leakage acoustic wave detection step includes: opening the casing valve to release pressure to generate pressure difference between the tubing and the casing, the pressure difference is not less than 2MPa, collecting temperature, pressure and acoustic wave signals.

[0014] In the method, the gas in the oil pipe and / or the casing is collected by the portable multi-component gas detection module to obtain the fluid medium components in the oil pipe and / or the casing, the sound velocity of the oil pipe mouth and / or the casing mouth is calculated, and then the liquid level detection and the leakage sound wave detection are performed, so that the detection accuracy is further improved.

[0015] A dual-sound wave downhole leakage point positioning system for a carbon dioxide injection well comprises:

[0016] The liquid level detection module collects the temperature, pressure and sound wave signals of the oil pipe and / or the casing well mouth to obtain the liquid surface position in the oil pipe and / or the casing.

[0017] The oil pipe leakage sound wave detection module collects the temperature, pressure and sound wave signals of the oil pipe well mouth to obtain the leakage position in the oil pipe.

[0018] In the system, the temperature, pressure and sound wave signals of the oil pipe and / or the casing well mouth are obtained by the liquid level detection module, and the liquid surface position in the oil pipe and / or the casing is obtained through the temperature, pressure and sound wave signals; the leakage position is obtained by the oil pipe leakage sound wave detection module through the temperature, pressure, sound wave signals of the oil pipe well mouth and the liquid surface position in the oil pipe; the oil pipe leakage sound wave detection module in the system detects the oil pipe mouth of the oil pipe well, avoiding the liquid pollution of the sound wave sensor.

[0019] In the system, the oil pipe leakage sound wave detection module comprises: an oil pipe leakage sound wave detection module main body portion, a temperature pressure sensor and a sound wave sensor data channel are installed on the oil pipe leakage sound wave detection module main body portion, a sound wave sensor is installed in the oil pipe leakage sound wave detection module main body portion through a first sound wave sensor support and a second sound wave sensor support, and the sound wave sensor is in data connection with the sound wave sensor data channel.

[0020] In the oil pipe leakage sound wave detection module, a temperature pressure sensor is installed on the main body portion, and a sound wave sensor is installed inside, so that the temperature, pressure and sound wave information can be obtained through the oil pipe leakage sound wave detection module; a sound wave sensor data channel in data connection with the sound wave sensor is also installed on the main body portion, so that the data can be transmitted to the outside in real time.

[0021] Further, the materials of the first sound wave sensor support and the second sound wave sensor support are damping rubber.

[0022] The sensor support is made of damping rubber material with large damping, which is used for supporting and fixing the sound wave sensor and reducing the interference of solid sound transmission on the signal collection of the sound wave sensor, so as to ensure that the signal received by the sound wave sensor is the reflected sound wave information in the oil pipe.

[0023] In the system, the liquid level detection module comprises the liquid surface acoustic wave detection module and the pressurizing structure, the liquid surface acoustic wave detection module is coupled with the pressurizing structure through the valve structure, and the liquid surface acoustic wave detection module is consistent with the oil pipe leakage acoustic wave detection module structure.

[0024] In the liquid level detection module, the liquid surface acoustic wave detection module is used to obtain acoustic wave information for obtaining the liquid surface position, the pressurizing structure is used to control inflation, pressurization and pressure relief, and conditions for inflation to pressure stabilization and acoustic wave information acquisition are provided, inflation operation is performed through the valve structure of the pressurizing structure, and after the liquid level detection module is filled with gas and the pressure is stable, the valve structure of the pressurizing structure is closed; the pressurizing structure is used to pressurize, temperature, pressure and acoustic wave signal acquisition are performed, and then pressure relief is performed through the valve structure to generate a liquid level detection acoustic wave sound source.

[0025] In the liquid level detection module, the pressurizing structure comprises:

[0026] The pressurizing structure comprises a pressurizing structure main body, a non-inflatable air bag and a pressurizing screw plug; one end of the non-inflatable air bag is coupled with the pressurizing structure main body, and the other end of the non-inflatable air bag is coupled with the pressurizing screw plug.

[0027] The pressurizing structure pressurizes the non-inflatable air bag through the pressurizing screw plug, thereby simplifying the pressurizing operation for generating an acoustic wave sound source.

[0028] Further, the pressurizing structure main body has a three-thread connection structure comprising a first thread, a second thread and a third thread; the first thread is used to connect the valve structure, the second thread is used to connect the non-inflatable air bag, and the third thread is used to connect the pressurizing screw plug.

[0029] The pressurizing structure main body is provided with threads at positions corresponding to the valve structure, the non-inflatable air bag and the pressurizing screw plug, thereby facilitating assembly of the pressurizing structure.

[0030] The system further comprises:

[0031] The portable multi-component gas detection module collects oil pipe and / or casing wellhead gas to obtain fluid medium components in the oil pipe and / or casing.

[0032] The system further comprises a portable multi-component gas detection module, which collects oil pipe and / or casing wellhead gas to obtain fluid medium components in the oil pipe and / or casing, so that the acoustic velocity of the oil pipe and / or casing wellhead can be calculated, and the liquid level detection and leakage position detection can be more accurate.

[0033] The portable multi-component gas detection module comprises a gas sampling bag, a sampling connection hose and a gas detection device main body; the gas sampling bag is connected with the gas detection device main body through the sampling connection hose.

[0034] The gas fluid medium component can be conveniently and quickly obtained through the portable multi-component gas detection module.

[0035] The system comprises a tubing leakage acoustic wave detection module, a tubing (or casing) liquid level detection module and a tubing (or casing) portable multi-component gas detection module.

[0036] The tubing leakage acoustic wave detection module comprises:

[0037] The first acoustic wave sensor support (made of damping rubber, used for supporting and fixing the acoustic wave sensor, and reducing the interference of solid sound transmission on the signal collection of the acoustic wave sensor); the second acoustic wave sensor support (same as the first acoustic wave sensor support); the acoustic wave sensor (used for collecting the leakage acoustic wave signal in the tubing); the main part of the tubing leakage acoustic wave detection module (used for the assembly of various components, and ensuring the sealing of the device); the temperature and pressure sensor (applying the existing technology to combine the temperature and pressure sensors together, and only using one interface for data collection, reducing the complexity of the main part and increasing the sealability of the main part); the acoustic wave sensor data channel, which can be connected with the internal acoustic wave sensor using the existing waterproof two-way joint to transmit the collected data to the outside in real time for data collection and processing; the tail plug of the tubing leakage acoustic wave detection module (used for sealing the tubing leakage acoustic wave detection module, and facilitating the cleaning of the device). The left threaded connection interface of the main part of the tubing leakage acoustic wave detection module in the system is suitable for the structure of a carbon dioxide injection well.

[0038] The tubing (or casing) liquid level detection module comprises:

[0039] The tubing leakage acoustic wave detection module except the tail plug (the functions of the parts are the same as above); the valve structure connecting the tubing leakage acoustic wave detection module except the tail plug and the pressurizing structure, used for controlling the communication between the pressurizing structure and the structure, and having connecting threads at both ends; the pressurizing structure, which comprises a pressurizing structure main body, a non-inflatable air bag and a pressurizing screw plug. The pressurizing structure main body has three threaded connection structures, the first thread is used for connecting the valve structure, the second thread is used for connecting the non-inflatable air bag, and the third thread is used for connecting the pressurizing screw plug.

[0040] The tubing (or casing) portable multi-component gas detection module comprises:

[0041] This module is mainly used to provide the function of portable multi-component gas detection in tubing (or casing) by using the existing technology. The main components of this module include: gas sampling bag (including sampling bag inlet valve and sampling bag outlet valve), sampling connection hose and gas detection device main body (including sampling bag inlet and sampling bag outlet). The portable multi-component gas detection module is suitable for detecting the typical fluid medium components (carbon dioxide, carbon monoxide, methane, nitrogen, hydrogen, oxygen) in the tubing, annulus of carbon dioxide injection well.

[0042] Application method of dual acoustic wave downhole leak point positioning system for carbon dioxide injection well

[0043] Collecting gas components in tubing (or casing)

[0044] Open the gas sampling bag inlet valve and connect the gas sampling bag inlet to the outlet of the pressure instrument cock valve of the tubing (or casing) four-way valve.

[0045] Open the tubing (or casing) four-way valve main valve and slowly open the cock valve to release gas sampling. When the gas sampling bag is full, stop sampling, close the gas sampling bag inlet valve, and close the cock valve and tubing (or casing) four-way valve main valve.

[0046] Connect the gas sampling bag outlet to the sampling bag inlet of the gas detection device main body through the sampling connection hose. Open the portable multi-component gas detection module, open the gas sampling bag outlet valve when the parameters of the portable multi-component gas detection module are stable, and perform gas component analysis. Record the gas composition content when the component analysis result is stable.

[0047] Close the portable multi-component gas detection module and gas sampling bag outlet valve, and remove the gas sampling hose to end the gas component analysis.

[0048] Measuring the liquid level in the tubing (or casing)

[0049] Threadedly connect the left end of the tubing (or casing) liquid level detection module main body to the tubing (or casing) four-way valve at the wellhead of the carbon dioxide injection well, and keep the valve structure of the pressurizing structure closed.

[0050] Slowly open the tubing (or casing) four-way valve at the wellhead of the carbon dioxide injection well to test the sealing performance of the tubing (or casing) liquid level detection module.

[0051] After the tubing (or casing) liquid level detection module passes the sealing performance test, open the tubing (or casing) four-way valve at the wellhead of the carbon dioxide injection well and the valve structure of the pressurizing structure for inflation operation. When the tubing (or casing) liquid level detection module is full of gas and the pressure is stable, close the valve structure of the pressurizing structure.

[0052] The screw-in plug in the screw-in pressurizing structure pressurizes the non-expansion gas bag.

[0053] The valve structure of the pressurizing structure is rapidly opened to release pressure to generate a liquid level detection sound wave source, and the tubing (or casing) liquid level detection module collects temperature, pressure and sound wave signals.

[0054] After the data collection is completed, the tubing (or casing) four-way valve at the wellhead of the carbon dioxide injection well is closed, the pressure instrument cock valve at the tubing (or casing) four-way is opened to release the residual pressure gas, and the tubing (or casing) liquid level detection module is removed when the pressure is 0.

[0055] Measuring the tubing leakage position:

[0056] The left end of the tubing leakage sound wave detection module main body part is threadedly connected to the tubing four-way at the wellhead of the carbon dioxide injection well.

[0057] The tubing leakage sound wave detection module is slowly opened to test the sealing property.

[0058] After the tubing leakage sound wave detection module passes the sealing property test, the casing four-way valve at the wellhead of the carbon dioxide injection well is opened to release pressure, and the tubing and casing pressure reaches a certain difference (more than 2MPa) before the casing four-way valve at the wellhead of the carbon dioxide injection well is closed.

[0059] The tubing leakage sound wave detection module is opened to collect temperature, pressure and leakage sound wave signals.

[0060] After the data collection is completed, the tubing four-way valve at the wellhead of the carbon dioxide injection well is closed, the pressure instrument cock valve at the tubing four-way is opened to release the residual pressure gas, and the tubing leakage sound wave detection module is removed when the pressure is 0.

[0061] In the present application, the inventor finds that in the shut-in state of the carbon dioxide injection well, the carbon dioxide in the tubing and the reservoir fluid reach pressure balance and a stable liquid level appears, which provides the condition for detecting the tubing leakage position by using the sound wave detection method. The downhole leakage point positioning system in the present application considers this feature and uses the method of adding a sound wave sensor in the tubing to avoid liquid pollution of the sound wave sensor. The downhole tubing leakage sound wave positioning system in the present application can collect the leakage sound wave characteristic signals propagating along the tubing, analyze the tubing leakage sound wave characteristic signals to obtain the tubing leakage position, make up for the deficiency that the sound wave detection method applied in the annulus to detect the tubing leakage has high requirements on the wellhead detection conditions, and has technical feasibility.

[0062] The inventors also find that the influence of gas components in the casing gas on the sound wave propagation speed is not considered in the existing acoustic wave method for detecting the annulus liquid level or the leakage position at the wellhead, resulting in a large error between the calculated leakage position by the sound wave and the actual leakage position, and the accurate leakage point positioning cannot be achieved. The system of the present application comprises a portable multi-component gas detection module suitable for typical fluid medium components (carbon dioxide, carbon monoxide, methane, nitrogen, hydrogen, oxygen) in the tubing and annulus of the carbon dioxide injection well, which can realize accurate measurement of the gas components at the wellhead, so as to correct the sound speed at the wellhead in the tubing and the casing.

[0063] The measurement data obtained by the present application can realize accurate measurement of the annulus liquid level of the carbon dioxide injection well and accurate positioning of the tubing leakage position underground.

[0064] Advantages:

[0065] The present application provides a double sound wave downhole leakage point positioning system and method for a carbon dioxide injection well, which can be used for tubing leakage position detection, tubing (or casing) liquid level detection and gas component detection in the tubing (or casing) of the carbon dioxide injection well. The tubing liquid level detection result can provide parameter supplement for tubing leakage position detection data interpretation, i.e. accurately providing the liquid level position in the tubing. The gas component detection result in the tubing (or casing) can provide data support for solving the sound speed at the wellhead in the tubing (or casing), i.e. the gas components can solve the sound speed result of the mixture at the wellhead in the tubing (or casing) according to the corresponding experimental data or theoretical formula, which guarantees the data accuracy in the calculation of the liquid level and the leakage position. Therefore, the system of the present application has the advantages of accurate measurement of the tubing (or casing) liquid level of the carbon dioxide injection well and accurate positioning of the tubing leakage position underground.

[0066] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0067] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0068] Figure 1 It is a schematic diagram of the system of the present application;

[0069] Figure 2The schematic diagram of the oil pipe leakage acoustic wave detection module of the present application;

[0070] Figure 3 The schematic diagram of the oil pipe leakage acoustic wave detection module of the present application;

[0071] Figure 4 The schematic diagram of the oil pipe leakage acoustic wave detection module of the present application;

[0072] Figure 5 The schematic diagram of the oil pipe leakage acoustic wave detection module of the present application;

[0073] Figure 6 The schematic diagram of the oil pipe leakage acoustic wave detection module of the present application;

[0074] Figure 7 The schematic diagram of the oil pipe leakage acoustic wave detection module of the present application;

[0075] Figure 8 The schematic diagram of the oil pipe leakage acoustic wave detection module of the present application;

[0076] Figure 9 The schematic diagram of the oil pipe leakage acoustic wave detection module of the present application;

[0077] Figure 10 The schematic diagram of the oil pipe leakage acoustic wave detection module of the present application;

[0078] Figure: 1, oil pipe leakage acoustic wave detection module; 101, first acoustic wave sensor support; 102, second acoustic wave sensor support; 103, acoustic wave sensor; 104, oil pipe leakage acoustic wave detection module main part; 105, temperature pressure sensor; 106, acoustic wave sensor data channel; 107, oil pipe leakage acoustic wave detection module tail plug; 2, liquid level detection module; 201, valve structure; 202, pressurization structure; 203, liquid surface acoustic wave detection module; 2021, pressurization structure main body; 2022, non-inflatable air bag; 2023, pressurization screw plug; 20211, first thread; 20212, second thread; 20213, third thread; 3, portable multi-component gas detection module; 301, gas detection device main body; 302, sampling connection hose; 303, gas sampling bag; 304, gas sampling bag inlet valve; 305, gas sampling bag valve; 306, gas detection device gas inlet; 307, gas detection device gas outlet; 4, carbon dioxide injection well; 401, oil pipe cross; 402, gate valve; 403, casing cross; 404, annulus liquid level; 405, oil pipe; 406, packer; 407, casing; 408, formation liquid level; 409, screen pipe; 410, perforated section; 411, plug; 412, formation. DETAILED DESCRIPTION

[0079] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0080] Firstly, the embodiments of the present application are described in detail Figures 1-10 , and the purposes, technical solutions and advantages of the embodiments of the present application are described. Figure 9 It can be seen from the specific embodiments that the carbon dioxide injection well schematic diagram is the application scenario of the following embodiments.

[0081] It can be seen from the specific embodiments that the carbon dioxide injection well schematic diagram is the application scenario of the following embodiments. Figure 10 It can be seen from the specific embodiments that the carbon dioxide injection well schematic diagram is the application scenario of the following embodiments.

[0082] S101, collecting tubing and / or casing wellhead gas to obtain a tubing and / or casing fluid medium component, and obtaining a tubing and / or casing wellhead sound velocity through the fluid medium component;

[0083] The first step obtains the tubing and / or casing wellhead gas component, obtains the tubing and / or casing wellhead sound velocity, solves the problem that the existing downhole liquid level detection and leak point detection do not consider the influence of different gases on sound propagation, and realizes the effect of improving detection accuracy.

[0084] S102, obtaining a tubing and / or casing fluid level position through the collected tubing and / or casing wellhead temperature, pressure, sound wave signal and the tubing and / or casing wellhead sound velocity obtained from S101.

[0085] The second step detects the tubing and / or casing fluid level position, and the downhole fluid level condition can be known, the problem that the existing downhole detection is easy to pollute the sound wave sensor is solved, and the pain point of the existing downhole detection is solved.

[0086] S103, obtaining a tubing leak position through the collected tubing wellhead temperature, pressure, sound wave signal, the tubing wellhead sound velocity obtained from S101 and the tubing fluid level position obtained from S102.

[0087] The third step detects the leak point, first detects the tubing mouth, solves the problem that the existing downhole detection is easy to pollute the sound wave sensor, and Figure 9 It can be seen that the tubing mouth is obviously higher than the casing mouth, and the tubing mouth has no risk of polluting the sound wave sensor during pressure relief, and secondly, the problem that the existing detection method directly detects the tubing mouth through the sound wave sensor is not accurate is solved by first confirming the tubing fluid level position and the casing gas component, and the detection accuracy is improved.

[0088] The embodiments of the present application provide a method.

[0089] The system comprises: an oil pipe leakage acoustic wave detection module 1, an oil pipe (or casing) liquid level detection module 2 and an oil pipe (or casing) portable multi-component gas detection module 3.

[0090] Oil pipe leakage acoustic wave detection module 1:

[0091] A first acoustic wave sensor bracket 101 (made of vibration-damping rubber with high damping, used to support and fix the acoustic wave sensor while reducing interference from solid-borne sound on acoustic wave sensor signal acquisition); a second acoustic wave sensor bracket 102 (same function as the first acoustic wave sensor bracket 101); an acoustic wave sensor 103 (used to collect leakage acoustic wave signals in the oil pipe); a main body 104 of the oil pipe leakage acoustic wave detection module (used for assembling various components while ensuring the sealing of the device); a temperature and pressure sensor 105 (applying existing technology to combine temperature and pressure sensors with only one interface for data acquisition, reducing the complexity of the main body and increasing its sealability); an acoustic wave sensor data path 106, which can be connected to the internal acoustic wave sensor 103 using an existing waterproof two-way connector to transmit the collected data in real time to the external device for data acquisition and processing; and a tail plug 107 of the oil pipe leakage acoustic wave detection module (used to seal the oil pipe leakage acoustic wave detection module and facilitate cleaning of the device).

[0092] The threaded connection interface at the left end of the main body of the oil pipe leakage acoustic wave detection module in the system of the present invention is suitable for the wellbore structure of the carbon dioxide injection well.

[0093] Oil pipe (or casing) liquid level detection module 2:

[0094] The rest of the oil pipe leakage acoustic wave detection module 1 except the tail plug (the same as above) is the liquid level acoustic wave detection module 203; the valve structure 201 connecting (the rest of the oil pipe leakage acoustic wave detection module except the tail plug) and the pressurizing structure 202 is used to control the communication between the pressurizing structure 202 and the oil pipe leakage acoustic wave detection module 1, and has connecting threads at both ends; the pressurizing structure 202, including ( Figure 6 ) pressurized structural body 2021; non-expandable airbag 2022; pressurized screw plug 2023. The pressurized structural body 2021 has a three-thread connection structure ( Figure 7 ), the first thread 20211 is used to connect the valve structure 201, the second thread 20212 is used to connect the non-expandable airbag 2022, and the third thread 20213 is used to connect the pressurized screw-in plug 2023.

[0095] Oil pipe (or casing) portable multi-component gas detection module 3:

[0096] This module is mainly used to provide the function of portable multi-component gas detection in tubing (or casing) by using existing technology. The main components of this module include: gas sampling bag 303 (including gas sampling bag inlet valve 304 and gas sampling bag outlet valve 305), sampling connection hose 302 and gas detection device main body 301 (including gas detection device gas inlet 306 and gas detection device gas outlet 307). The portable multi-component gas detection module 3 is suitable for detecting typical fluid medium components (carbon dioxide, carbon monoxide, methane, nitrogen, hydrogen, oxygen) in the tubing, annulus of carbon dioxide injection well.

[0097] The application method of the following dual acoustic downhole leak point location system for carbon dioxide injection well:

[0098] Collecting gas components in tubing (or casing):

[0099] Open the gas sampling bag inlet valve 304 and connect the gas sampling bag 303 inlet to the pressure gauge cock valve outlet of the tubing (or casing) four-way valve.

[0100] Open the tubing (or casing) four-way valve main valve, slowly open the cock valve to release gas sampling, and end the sampling when the gas sampling bag 303 is full, close the gas sampling bag inlet valve 304, and close the cock valve and the tubing (or casing) four-way valve main valve.

[0101] Connect the gas sampling bag 303 outlet to the gas detection device main body 301 sampling bag inlet through the sampling connection hose 302. Open the portable multi-component gas detection module 3, open the gas sampling bag outlet valve 305 after the parameters of the portable multi-component gas detection module are stable, perform gas component analysis, and record the gas composition content after the component analysis result is stable.

[0102] Close the portable multi-component gas detection module 3 and the gas sampling bag outlet valve 305, and remove the gas sampling hose 302 to end the gas component analysis.

[0103] Measuring the liquid level in the tubing (or casing):

[0104] Threadedly connect the tubing leak acoustic detection module main body part 104 left end of the tubing (or casing) liquid level detection module 2 to the carbon dioxide injection well wellhead tubing (or casing) four-way valve, and keep the valve structure 201 of the pressurized structure 202 in the closed state.

[0105] Slowly open the carbon dioxide injection well wellhead tubing (or casing) four-way valve, and test the sealing property of the tubing (or casing) liquid level detection module.

[0106] After the tubing (or casing) liquid level detection module passes the sealing test, open the tubing (or casing) four-way valve at the wellhead of the carbon dioxide injection well and the valve structure 201 of the pressurizing structure 202 to perform the inflation operation. After the tubing (or casing) liquid level detection module is filled with gas and the pressure is stable, close the valve structure 201 of the pressurizing structure 202.

[0107] The screw-in plug 2023 in the pressurizing structure 202 pressurizes the non-expanding air bag 2022.

[0108] Open the tubing (or casing) liquid level detection module 2 to collect signals of temperature, pressure and acoustic waves. Quickly open the valve structure 201 of the pressurizing structure 202 to release pressure and generate a liquid level detection acoustic wave source.

[0109] After the data collection is completed, close the tubing (or casing) four-way valve at the wellhead of the carbon dioxide injection well. Open the pressure instrument cock valve of the tubing (or casing) four-way to release the residual pressure gas. When the pressure is 0, remove the tubing (or casing) liquid level detection module 2.

[0110] Measure the tubing leakage position:

[0111] Threadedly connect the left end of the tubing leakage acoustic wave detection module main body part 104 to the tubing four-way at the wellhead of the carbon dioxide injection well.

[0112] Slowly open the tubing four-way valve at the wellhead of the carbon dioxide injection well to test the sealing of the tubing leakage acoustic wave detection module.

[0113] After the tubing leakage acoustic wave detection module passes the sealing test, open the casing four-way valve at the wellhead of the carbon dioxide injection well to perform the pressure relief operation. When the tubing and casing pressures reach a certain difference (more than 2 MPa), close the casing four-way valve at the wellhead of the carbon dioxide injection well.

[0114] Open the tubing leakage acoustic wave detection module 1 to collect signals of temperature, pressure and leakage acoustic waves.

[0115] After the data collection is completed, close the tubing four-way valve at the wellhead of the carbon dioxide injection well. Open the pressure instrument cock valve of the tubing four-way to release the residual pressure gas. When the pressure is 0, remove the tubing leakage acoustic wave detection module.

[0116] Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent features. Such modifications or replacements do not change the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A dual acoustic downhole leak point location method for carbon dioxide tubing, comprising: The method comprises the following steps: S1, using a liquid level detection module (2), collecting tubing and / or casing wellhead temperature, pressure, acoustic wave signals, and obtaining the liquid level position in the tubing and / or casing; the liquid level detection step comprises: first, inflating the tubing to stabilize the pressure, collecting temperature, pressure and liquid level signals, and then acquiring acoustic wave signals; S2, using a tubing leakage acoustic wave detection module (1), collecting tubing wellhead temperature, pressure, acoustic wave signals, and obtaining the tubing leakage position; the leakage acoustic wave detection step comprises: opening the casing valve to release pressure, collecting temperature, pressure and acoustic wave signals.

2. The positioning method according to claim 1, characterized in that, The method comprises the following steps: S101, collecting tubing and / or casing wellhead gas by a portable multi-component gas detection module (3), obtaining the fluid medium components in the tubing and / or casing, and obtaining the acoustic velocity at the tubing and / or casing wellhead through the fluid medium components; S102, using a liquid level detection module (2), collecting tubing and / or casing wellhead temperature, pressure, acoustic wave signals and acoustic velocity at the tubing and / or casing wellhead, and obtaining the liquid level position in the tubing and / or casing; the liquid level detection step comprises: first, inflating the tubing to stabilize the pressure, collecting temperature, pressure and liquid level signals, and then pressurizing and releasing through the liquid level detection module (2) to acquire acoustic wave signals; S103, using a tubing leakage acoustic wave detection module (1), collecting tubing wellhead temperature, pressure, acoustic wave signals, liquid level position in the tubing, and acoustic velocity at the tubing wellhead, and obtaining the tubing leakage position; the leakage acoustic wave detection step comprises: opening the casing valve to release pressure until the pressure difference between the tubing and the casing is not less than 2 MPa, and then collecting temperature, pressure and acoustic wave signals.

3. A dual sonic downhole leak location system for carbon dioxide tubing, characterized by, The system comprises: A liquid level detection module (2) for collecting tubing and / or casing wellhead temperature, pressure and acoustic wave signals to obtain the liquid level position in the tubing and / or casing; A tubing leakage acoustic wave detection module (1) for collecting tubing wellhead temperature, pressure and acoustic wave signals to obtain the leakage position in the tubing.

4. The positioning system of claim 3, wherein, The tubing leakage acoustic wave detection module (1) comprises a tubing leakage acoustic wave detection module main body portion (104), a temperature and pressure sensor (105) and an acoustic wave sensor data channel (106) installed on the tubing leakage acoustic wave detection module main body portion (104), and an acoustic wave sensor (103) installed inside the tubing leakage acoustic wave detection module main body portion (104) through a first acoustic wave sensor support (101) and a second acoustic wave sensor support (102), wherein the acoustic wave sensor (103) is in data connection with the acoustic wave sensor data channel (106).

5. The positioning system of claim 4, wherein, The first acoustic wave sensor support (101) and the second acoustic wave sensor support (102) are made of damping rubber.

6. The positioning system of claim 4, wherein, The liquid level detection module (2) comprises a liquid level acoustic wave detection module (203) and a pressurizing structure (202), wherein the liquid level acoustic wave detection module (203) is coupled with the pressurizing structure (202) through a valve structure (201), and the liquid level detection module (203) is consistent in structure with the tubing leakage acoustic wave detection module (1).

7. The positioning system of claim 6, wherein, The pressurizing structure (202) comprises a pressurizing structure body (2021), a non-inflatable air bag (2022), and a pressurizing screw-in plug (2023); one end of the non-inflatable air bag (2022) is coupled with the pressurizing structure body (2021), and the other end of the non-inflatable air bag (2022) is coupled with the pressurizing screw-in plug (2023).

8. The positioning system of claim 7, wherein, The pressurizing structure body (2021) has a three-thread connection structure, comprising a first thread (20211), a second thread (20212), and a third thread (20213); the first thread (20211) is used for connecting a valve structure (201), the second thread (20212) is used for connecting the non-inflatable air bag (2022), and the third thread (20213) is used for connecting the pressurizing screw-in plug (2023).

9. The positioning system of claim 3, wherein, The system further comprises: A portable multi-component gas detection module (3) collects tubing and / or casing wellhead gas to obtain the components of the fluid medium in the tubing and / or casing.

10. The positioning system of claim 9, wherein, The portable multi-component gas detection module (3) comprises a gas sampling bag (303), a sampling connection hose (302), and a gas detection device body (301); the gas sampling bag (303) is connected with the gas detection device body (301) through the sampling connection hose (302).

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