Underwater wellhead inner and outer layer casing pipe closed annulus monitoring system and method, processing equipment and storage medium

Abstract

The invention relates to an underwater wellhead inner and outer layer casing pipe closed annulus monitoring system and method, processing equipment and a storage medium. Comprising a C annulus temperature and pressure monitoring device, a C annulus transmitting coil, a B annulus receiving coil, a relay amplifier, a first B annulus transmitting coil, a first A annulus receiving coil, a B annulus temperature and pressure monitoring device, a second B annulus transmitting coil, a second A annulus receiving coil and an upper computer. A C annulus temperature and pressure monitoring device and a C annulus transmitting coil are arranged in the C annulus, a B annulus receiving coil, a B annulus temperature and pressure monitoring device, a relay amplifier, a first B annulus transmitting coil and a second B annulus transmitting coil are arranged in the B annulus, and a first A annulus receiving coil and a second A annulus receiving coil are arranged in the A annulus. And the first A annulus receiving coil and the second A annulus receiving coil are both connected with an upper computer. The underwater wellhead closed annulus monitoring device can be widely applied to the technical field of underwater wellhead closed annulus monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater wellhead closed annulus monitoring, and in particular to an underwater wellhead inner and outer casing closed annulus monitoring system, method, processing equipment and storage medium. Background Art

[0002] As oil production expands to complex environments such as the deep sea, underwater wellhead annular pressure monitoring is crucial to wellhead safety and environmental protection. Abnormal annular pressure is not effectively controlled, which can easily cause casing damage, crushing and other accidents. Casing damage may lead to oil and gas leakage in oil and gas wells, resulting in a large amount of oil and gas resource loss, affecting the production efficiency and economic benefits of oil and gas fields, causing environmental pollution, and may also cause fires or explosions, threatening the safety of operators. Therefore, monitoring the closed annulus and taking appropriate preventive measures are crucial to ensure the safety and efficient production of oil and gas wells.

[0003] However, the underwater wellhead annulus pressure monitoring method in the existing technology only has monitoring means for annulus A, and is temporarily unable to transmit the monitoring information of annulus B and annulus C. The acoustic wave wireless transmission monitoring method also does not obtain data, making it impossible to effectively control the conditions of annulus B and annulus C. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a closed annulus monitoring system, method, processing equipment and storage medium for the inner and outer casing of an underwater wellhead, which can monitor the temperature and pressure of the B annulus and the C annulus and transmit the B annulus and the C annulus.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: In the first aspect, a closed annular space monitoring system for inner and outer casings of an underwater wellhead is provided, including a C annular space temperature and pressure monitoring device, a C annular space transmitting coil, a B annular space receiving coil, a relay amplifier, a first B annular space transmitting coil, a first A annular space receiving coil, a B annular space temperature and pressure monitoring device, a second B annular space transmitting coil, a second A annular space receiving coil and a host computer; The C annulus is provided with the C annulus temperature and pressure monitoring device and the C annulus transmitting coil, the B annulus receiving coil, the relay amplifier and the first B annulus transmitting coil are provided in the B annulus, the first A annulus receiving coil is provided in the A annulus, the C annulus temperature and pressure monitoring device is used to collect the temperature and pressure monitoring data of the C annulus in real time, the C annulus transmitting coil is used to generate a first low-frequency electromagnetic signal based on the temperature and pressure monitoring data of the C annulus, the B annulus receiving coil is used to send the first low-frequency electromagnetic signal to the relay amplifier, the relay amplifier is used to amplify the first low-frequency electromagnetic signal, and the first B annulus transmitting coil is used to receive the amplified first low-frequency electromagnetic signal and send it to the first A annulus receiving coil; The B annulus is also provided with the B annulus temperature and pressure monitoring device and the second B annulus transmitting coil, and the A annulus is also provided with the second A annulus receiving coil, the B annulus temperature and pressure monitoring device is used to collect the temperature and pressure monitoring data of the B annulus in real time, and the second B annulus transmitting coil is used to generate a second low-frequency electromagnetic signal based on the temperature and pressure monitoring data of the B annulus and send it to the second A annulus receiving coil; The first A annulus receiving coil and the second A annulus receiving coil are both connected to the host computer, and the host computer is used to obtain the temperature and pressure monitoring information of the B annulus and the C annulus according to the first low-frequency electromagnetic signal sent by the first A annulus receiving coil and the second low-frequency electromagnetic signal sent by the second A annulus receiving coil, and then determine the safety status of the closed annulus of the underwater wellhead.

[0006] Furthermore, the C annulus transmitting coil and the B annulus receiving coil are arranged at the same height and close to both sides of the same area of ​​the B annulus casing wall; the first A annulus receiving coil and the first B annulus transmitting coil are arranged at the same height and close to both sides of the same area of ​​the A annulus casing wall; the second A annulus receiving coil and the second B annulus transmitting coil are arranged at the same height and close to both sides of the same area of ​​the A annulus casing wall.

[0007] Furthermore, the relay amplifier is arranged between the B-loop receiving coil and the first B-loop transmitting coil.

[0008] Furthermore, the C annulus temperature and pressure monitoring device and the C annulus transmitting coil are arranged in the same axial direction of the C annulus, and the B annulus temperature and pressure monitoring device and the second B annulus transmitting coil are arranged in the same axial direction of the B annulus.

[0009] Furthermore, the host computer is provided with: A data receiving module, used for receiving a first low-frequency electromagnetic signal transmitted by the first A-loop receiving coil and a second low-frequency electromagnetic signal transmitted by the second A-loop receiving coil; A decoding module, used for decoding and analyzing the received first low-frequency electromagnetic signal and the second low-frequency electromagnetic signal to obtain the temperature and pressure monitoring data of the C annulus and the temperature and pressure monitoring data of the B annulus; The judgment module is used to judge whether the changes in temperature and pressure of the annulus B and the annulus C are safe based on the temperature and pressure monitoring data of the annulus C, the temperature and pressure monitoring data of the annulus B and the preset temperature and pressure thresholds.

[0010] In a second aspect, a method for monitoring the closed annulus of inner and outer casings of an underwater wellhead is provided, comprising: Acquire the temperature and pressure monitoring data of the underwater wellhead C annulus, and transmit it to the underwater wellhead B annulus through low-frequency electromagnetic communication, and then transmit it from the B annulus to the underwater wellhead A annulus through low-frequency electromagnetic communication; Acquire the temperature and pressure monitoring data of the underwater wellhead B annulus and transmit it to the underwater wellhead A annulus through low-frequency electromagnetic communication; Based on the low-frequency electromagnetic signal received by the underwater wellhead A annulus, the temperature and pressure monitoring information of the B annulus and the C annulus is obtained, and then the safety status of the closed annulus of the underwater wellhead is determined.

[0011] Further, the temperature and pressure monitoring data of the underwater wellhead C annulus is obtained, and transmitted to the underwater wellhead B annulus through low-frequency electromagnetic communication, and then transmitted from the B annulus to the underwater wellhead A annulus through low-frequency electromagnetic communication, including: The C annulus temperature and pressure monitoring device collects the C annulus temperature and pressure monitoring data in real time; The C annulus transmitting coil receives the temperature and pressure monitoring data of the C annulus and generates a first low-frequency electromagnetic signal, which is sent to the B annulus receiving coil, wherein the B annulus receiving coil and the C annulus transmitting coil are arranged at the same height and are located on both sides of the same area of ​​the B annulus casing wall; The B ring receiving coil sends the first low-frequency electromagnetic signal to a relay amplifier disposed in the B ring, and the relay amplifier amplifies the first low-frequency electromagnetic signal and transmits it to the first B ring transmitting coil; The first B annular space transmitting coil sends a first low-frequency electromagnetic signal to the first A annular space receiving coil, wherein the first A annular space receiving coil and the first B annular space transmitting coil are arranged at the same height and close to both sides of the same area of ​​the A annular space casing wall.

[0012] Further, the temperature and pressure monitoring data of the annulus B of the underwater wellhead is obtained and transmitted to the annulus A of the underwater wellhead through low-frequency electromagnetic communication, including: The B annulus temperature and pressure monitoring device in the B annulus collects the temperature and pressure monitoring data of the B annulus in real time; The second B annulus transmitting coil receives the temperature and pressure monitoring data of the B annulus and generates a second low-frequency electromagnetic signal, which is sent to the second A annulus receiving coil, wherein the second A annulus receiving coil and the second B annulus transmitting coil are arranged at the same height and close to both sides of the same area of ​​the A annulus casing wall.

[0013] In a third aspect, a processing device is provided, comprising computer program instructions, wherein the computer program instructions, when executed by the processing device, are used to implement the steps corresponding to the above-mentioned method for monitoring the closed annulus of inner and outer casings of an underwater wellhead.

[0014] In a fourth aspect, a computer-readable storage medium is provided, on which computer program instructions are stored, wherein the computer program instructions, when executed by a processor, are used to implement the steps corresponding to the above-mentioned method for monitoring the closed annulus of inner and outer casings of an underwater wellhead.

[0015] The present invention adopts the above technical solution, which has the following advantages: 1. Multi-annulus data transmission: The present invention can directly penetrate the metal casing for communication, which can solve the problem that the existing method cannot effectively transmit the monitoring data of the B annulus and the C annulus, and ensure that the annulus pressure and temperature changes can be transmitted and monitored in real time, thereby enhancing the wellhead safety.

[0016] 2. Comprehensive monitoring: Different from the prior art which can only monitor the A annulus, the present invention can comprehensively monitor the temperature and pressure of the B annulus and the C annulus of the underwater wellhead, thus improving the integrity and accuracy of the monitoring.

[0017] 3. Prevent accidents: The present invention can timely detect potential abnormal changes by real-time monitoring of the temperature and pressure of the B annulus and the C annulus, take preventive measures, and reduce the risks of accidents such as casing damage, oil and gas leakage, environmental pollution, fire or explosion.

[0018] 4. Environmental protection and safety: The present invention helps to effectively protect the environment, prevent oil and gas leakage, and enhance the safety of operators, thereby avoiding the loss of oil and gas resources and the occurrence of environmental disasters.

[0019] 5. Improving production efficiency and economic benefits The present invention can significantly improve the production efficiency and economic benefits of oil and gas fields by ensuring safe and efficient production at the wellhead and reducing accidents and resource losses.

[0020] 6. Adaptability to complex environments: The present invention can be applied in complex underwater environments, adapt to extreme operating conditions such as high pressure and low temperature in the deep sea, and meet the needs of modern oil and gas extraction.

[0021] In summary, the present invention can be widely applied in the technical field of underwater wellhead closed annulus monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference numerals are used to represent the same components. In the accompanying drawings: Figure 1 It is a structural schematic diagram provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0024] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described in the text are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0025] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0026] The underwater wellhead annulus pressure monitoring method in the existing technology only has monitoring means for annulus A, and is temporarily unable to transmit the monitoring information of annulus B and annulus C. The acoustic wave wireless transmission monitoring method also does not obtain data, making it impossible to effectively control the conditions of annulus B and annulus C. The embodiment of the present invention provides a closed annular space monitoring system for inner and outer casings of an underwater wellhead, comprising a C annular space temperature and pressure monitoring device, a C annular space transmitting coil, a B annular space receiving coil, a relay amplifier, a first B annular space transmitting coil, a first A annular space receiving coil, a B annular space temperature and pressure monitoring device, a second B annular space transmitting coil, a second A annular space receiving coil and a host computer; the C annular space is provided with a C annular space temperature and pressure monitoring device and a C annular space transmitting coil, the B annular space is provided with a B annular space receiving coil, a relay amplifier and a first B annular space transmitting coil, the A annular space is provided with a first A annular space receiving coil, the C annular space temperature and pressure monitoring device is used to collect temperature and pressure monitoring data of the C annular space in real time, the C annular space transmitting coil is used to generate a first low-frequency electromagnetic signal based on the temperature and pressure monitoring data of the C annular space, the B annular space receiving coil is used to send the first low-frequency electromagnetic signal to the relay amplifier, and the relay amplifier is used to The first low-frequency electromagnetic signal is amplified, and the first B annulus transmitting coil is used to receive the amplified first low-frequency electromagnetic signal and send it to the first A annulus receiving coil; a B annulus temperature and pressure monitoring device and a second B annulus transmitting coil are also provided in the B annulus, and a second A annulus receiving coil is also provided in the A annulus, the B annulus temperature and pressure monitoring device is used to collect the temperature and pressure monitoring data of the B annulus in real time, and the second B annulus transmitting coil is used to generate a second low-frequency electromagnetic signal based on the temperature and pressure monitoring data of the B annulus and send it to the second A annulus receiving coil; the first A annulus receiving coil and the second A annulus receiving coil are both connected to a host computer, and the host computer is used to obtain the temperature and pressure monitoring information of the B annulus and the C annulus according to the first low-frequency electromagnetic signal sent by the first A annulus receiving coil and the second low-frequency electromagnetic signal sent by the second A annulus receiving coil, so as to determine the safety condition of the closed annulus of the underwater wellhead. The present invention can directly penetrate the metal casing for communication, which can solve the problem that the existing method cannot effectively transmit the monitoring data of the B annulus and the C annulus, and ensure that the annulus pressure and temperature changes can be transmitted and monitored in real time, thereby enhancing the safety of the wellhead; it can comprehensively monitor the temperature and pressure of the B annulus and the C annulus of the underwater wellhead, and improve the integrity and accuracy of the monitoring; it can be used in complex underwater environments, adapt to extreme operating conditions such as high pressure and low temperature in the deep sea, and meet the needs of modern oil and gas extraction.

[0027] Example 1 like Figure 1As shown, this embodiment provides a closed annular space monitoring system for inner and outer casings of an underwater wellhead, including a C annular space temperature and pressure monitoring device 1, a C annular space transmitting coil 2, a B annular space receiving coil 3, a relay amplifier, a first B annular space transmitting coil 4, a first A annular space receiving coil 5, a B annular space temperature and pressure monitoring device 6, a second B annular space transmitting coil 7, a second A annular space receiving coil 8 and a host computer.

[0028] It should be noted that the annulus between the production casing and the production pipe string in the underwater wellhead is annulus A, the annulus between the technical casing and the production casing is annulus B, and the annulus between the surface casing and the technical casing is annulus C.

[0029] The C annulus is provided with a C annulus temperature and pressure monitoring device 1 and a C annulus transmitting coil 2, and the B annulus receiving coil 3, a relay amplifier and a first B annulus transmitting coil 4 are provided in the B annulus. The C annulus transmitting coil 2 and the B annulus receiving coil 3 are provided at the same height and close to both sides of the same area of ​​the B annulus casing wall, and the relay amplifier is provided between the B annulus receiving coil 3 and the first B annulus transmitting coil 4. The A annulus is provided with a first A annulus receiving coil 5, and the first A annulus receiving coil 5 and the first B annulus transmitting coil 4 are provided at the same height and close to both sides of the same area of ​​the A annulus casing wall. The C annulus temperature and pressure monitoring device 1 is used to collect the temperature and pressure monitoring data of the C annulus in real time and send it to the C annulus transmitting coil 2. The C annulus transmitting coil 2 is used to generate a first low-frequency electromagnetic signal based on the received temperature and pressure monitoring data of the C annulus and send it to the B annulus receiving coil 3. The B annulus receiving coil 3 is used to send the first low-frequency electromagnetic signal to the relay amplifier. The relay amplifier is used to amplify the first low-frequency electromagnetic signal and transmit it to the first B-loop transmitting coil 4. The first B-loop transmitting coil 4 is used to receive the amplified first low-frequency electromagnetic signal and send it to the first A-loop receiving coil 5.

[0030] The B annulus is also provided with a B annulus temperature and pressure monitoring device 6 and a second B annulus transmitting coil 7, and the A annulus is also provided with a second A annulus receiving coil 8. The second A annulus receiving coil 8 and the second B annulus transmitting coil 7 are arranged at the same height and close to both sides of the same area of ​​the A annulus casing wall. The B annulus temperature and pressure monitoring device 6 is used to collect the temperature and pressure monitoring data of the B annulus in real time and send it to the second B annulus transmitting coil 7. The second B annulus transmitting coil 7 is used to generate a second low-frequency electromagnetic signal based on the received B annulus temperature and pressure monitoring data and send it to the second A annulus receiving coil 8.

[0031] The first A annulus receiving coil 5 and the second A annulus receiving coil 8 are both connected to the host computer via a communication cable 9. The host computer is used to obtain the temperature and pressure monitoring information of the B annulus and the C annulus based on the first low-frequency electromagnetic signal sent by the first A annulus receiving coil 5 and the second low-frequency electromagnetic signal sent by the second A annulus receiving coil 8, and then determine the safety status of the closed annulus of the underwater wellhead.

[0032] In a preferred embodiment, the C annulus temperature and pressure monitoring device 1 and the B annulus temperature and pressure monitoring device 6 both include a temperature sensor and a pressure sensor.

[0033] In a preferred embodiment, the C annulus temperature and pressure monitoring device 1 and the C annulus transmitting coil 2 are arranged in the same axial direction of the C annulus, and the B annulus temperature and pressure monitoring device 6 and the second B annulus transmitting coil 7 are arranged in the same axial direction of the B annulus.

[0034] In a preferred embodiment, a data receiving module, a decoding module and a judgment module are provided in the host computer.

[0035] The data receiving module is used to receive a first low-frequency electromagnetic signal transmitted by the first A-loop receiving coil 5 and a second low-frequency electromagnetic signal transmitted by the second A-loop receiving coil 8 .

[0036] The decoding module is used to decode and analyze the received first low-frequency electromagnetic signal and the second low-frequency electromagnetic signal to obtain the temperature and pressure monitoring data of the C annulus and the temperature and pressure monitoring data of the B annulus.

[0037] The judgment module is used to judge whether the changes in temperature and pressure of the annulus B and the annulus C are safe based on the temperature and pressure monitoring data of the annulus C, the temperature and pressure monitoring data of the annulus B and the preset temperature and pressure thresholds.

[0038] Example 2 This embodiment provides a method for monitoring the closed annulus of the inner and outer casings of an underwater wellhead, comprising the following steps: 1) Obtain the temperature and pressure monitoring data of the underwater wellhead C annulus, and transmit it to the underwater wellhead B annulus through low-frequency electromagnetic communication, and then transmit it from the B annulus to the underwater wellhead A annulus through low-frequency electromagnetic communication, specifically: 1.1) The C annulus temperature and pressure monitoring device 1 collects the temperature and pressure monitoring data of the C annulus in real time.

[0039] 1.2) The C annulus transmitting coil 2 receives the temperature and pressure monitoring data of the C annulus and generates a first low-frequency electromagnetic signal, which is sent to the B annulus receiving coil 3, wherein the B annulus receiving coil 3 and the C annulus transmitting coil 2 are arranged at the same height and are located on both sides of the same area of ​​the B annulus casing wall.

[0040] 1.3) The B-loop receiving coil 3 sends the first low-frequency electromagnetic signal to a relay amplifier disposed in the B-loop. The relay amplifier amplifies the first low-frequency electromagnetic signal and transmits it to the first B-loop transmitting coil 4.

[0041] 1.4) The first B annular space transmitting coil 4 sends the first low-frequency electromagnetic signal to the first A annular space receiving coil 5, wherein the first A annular space receiving coil 5 and the first B annular space transmitting coil 4 are arranged at the same height and close to both sides of the same area of ​​the A annular space casing wall.

[0042] 2) Obtain the temperature and pressure monitoring data of the underwater wellhead B annulus and transmit it to the underwater wellhead A annulus through low-frequency electromagnetic communication, specifically: 2.1) The B annulus temperature and pressure monitoring device 6 in the B annulus collects the temperature and pressure monitoring data of the B annulus in real time.

[0043] 2.2) The second B annulus transmitting coil 7 receives the temperature and pressure monitoring data of the B annulus and generates a second low-frequency electromagnetic signal, which is sent to the second A annulus receiving coil 8, wherein the second A annulus receiving coil 8 and the second B annulus transmitting coil 7 are arranged at the same height and close to both sides of the same area of ​​the A annulus casing wall.

[0044] 3) Based on the low-frequency electromagnetic signal received by the underwater wellhead A annulus, the temperature and pressure monitoring information of the B annulus and the C annulus is obtained, and then the safety status of the underwater wellhead closed annulus is determined, specifically: 3.1) The host computer receives the first low-frequency electromagnetic signal transmitted by the first A ring receiving coil 5 and the second low-frequency electromagnetic signal transmitted by the second A ring receiving coil 8, and performs decoding analysis to obtain the temperature and pressure monitoring data of the C ring and the temperature and pressure monitoring data of the B ring.

[0045] 3.2) The host computer determines whether the changes in temperature and pressure of the annulus B and the annulus C are safe based on the temperature and pressure monitoring data of the annulus C, the temperature and pressure monitoring data of the annulus B, and the pre-set temperature and pressure thresholds.

[0046] Example 3 This embodiment provides a processing device corresponding to the closed annulus monitoring method of the inner and outer casing of the underwater wellhead provided in Example 2. The processing device can be suitable for client processing devices, such as mobile phones, laptops, tablet computers, desktop computers, etc., to execute the method of Example 2.

[0047] 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 mutual communication. The memory stores a computer program that can be run on the processing device, and when the processing device runs the computer program, the closed annulus monitoring method of the inner and outer casings of the underwater wellhead provided in this embodiment 2 is executed.

[0048] In some implementations, the memory may be a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage.

[0049] In some other implementations, the processor may be a central processing unit (CPU), a digital signal processor (DSP), or other general-purpose processors of various types, which are not limited herein.

[0050] In addition, the logic instructions in the above-mentioned memory can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0051] Those skilled in the art will understand that the structure of the above-mentioned computing device is only a partial structure related to the solution of the present invention, and does not constitute a limitation on the computing device to which the solution of the present invention is applied. The specific computing device may include more or fewer components, or combine certain components, or have a different arrangement of components.

[0052] Example 4 This embodiment provides a computer program product corresponding to the method for monitoring the closed annulus of inner and outer casing of an underwater wellhead provided in Example 2. The computer program product may include a computer-readable storage medium on which computer-readable program instructions for executing the method for monitoring the closed annulus of inner and outer casing of an underwater wellhead described in Example 2 are loaded.

[0053] Computer readable storage media can be tangible devices that hold and store instructions used by instruction execution devices. Computer readable storage media can be, for example, but not limited to, electronic storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any combination thereof.

[0054] The above embodiment provides a computer-readable storage medium, whose implementation principle and technical effect are similar to those of the above method embodiment, and will not be repeated here.

[0055] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0056] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0057] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0058] The above embodiments are only used to illustrate the present invention, wherein the structure, connection mode and manufacturing process of each component may be changed. Any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A closed annulus monitoring system for inner and outer casings of underwater wellheads, characterized in that: It includes a C annulus temperature and pressure monitoring device, a C annulus transmitting coil, a B annulus receiving coil, a relay amplifier, a first B annulus transmitting coil, a first A annulus receiving coil, a B annulus temperature and pressure monitoring device, a second B annulus transmitting coil, a second A annulus receiving coil and a host computer; The C annulus is provided with the C annulus temperature and pressure monitoring device and the C annulus transmitting coil, the B annulus receiving coil, the relay amplifier and the first B annulus transmitting coil are provided in the B annulus, the first A annulus receiving coil is provided in the A annulus, the C annulus temperature and pressure monitoring device is used to collect the temperature and pressure monitoring data of the C annulus in real time, the C annulus transmitting coil is used to generate a first low-frequency electromagnetic signal based on the temperature and pressure monitoring data of the C annulus, the B annulus receiving coil is used to send the first low-frequency electromagnetic signal to the relay amplifier, the relay amplifier is used to amplify the first low-frequency electromagnetic signal, and the first B annulus transmitting coil is used to receive the amplified first low-frequency electromagnetic signal and send it to the first A annulus receiving coil; The B annulus is also provided with the B annulus temperature and pressure monitoring device and the second B annulus transmitting coil, and the A annulus is also provided with the second A annulus receiving coil, the B annulus temperature and pressure monitoring device is used to collect the temperature and pressure monitoring data of the B annulus in real time, and the second B annulus transmitting coil is used to generate a second low-frequency electromagnetic signal based on the temperature and pressure monitoring data of the B annulus and send it to the second A annulus receiving coil; The first A annulus receiving coil and the second A annulus receiving coil are both connected to the host computer, and the host computer is used to obtain the temperature and pressure monitoring information of the B annulus and the C annulus according to the first low-frequency electromagnetic signal sent by the first A annulus receiving coil and the second low-frequency electromagnetic signal sent by the second A annulus receiving coil, and then determine the safety status of the closed annulus of the underwater wellhead.

2. The underwater wellhead inner and outer casing closed annulus monitoring system according to claim 1, characterized in that: The C annulus transmitting coil and the B annulus receiving coil are arranged at the same height and close to both sides of the same area of ​​the B annulus casing wall; the first A annulus receiving coil and the first B annulus transmitting coil are arranged at the same height and close to both sides of the same area of ​​the A annulus casing wall; the second A annulus receiving coil and the second B annulus transmitting coil are arranged at the same height and close to both sides of the same area of ​​the A annulus casing wall.

3. The underwater wellhead inner and outer casing closed annulus monitoring system according to claim 1, characterized in that: The relay amplifier is arranged between the B-loop receiving coil and the first B-loop transmitting coil.

4. The underwater wellhead inner and outer casing closed annulus monitoring system according to claim 1, characterized in that: The C annulus temperature and pressure monitoring device and the C annulus transmitting coil are arranged in the same axial direction of the C annulus, and the B annulus temperature and pressure monitoring device and the second B annulus transmitting coil are arranged in the same axial direction of the B annulus.

5. The underwater wellhead inner and outer casing closed annulus monitoring system according to claim 1, characterized in that: The host computer is provided with: A data receiving module, used for receiving a first low-frequency electromagnetic signal transmitted by the first A-loop receiving coil and a second low-frequency electromagnetic signal transmitted by the second A-loop receiving coil; A decoding module, used for decoding and analyzing the received first low-frequency electromagnetic signal and the second low-frequency electromagnetic signal to obtain the temperature and pressure monitoring data of the C annulus and the temperature and pressure monitoring data of the B annulus; The judgment module is used to judge whether the changes in temperature and pressure of the annulus B and the annulus C are safe based on the temperature and pressure monitoring data of the annulus C, the temperature and pressure monitoring data of the annulus B and the preset temperature and pressure thresholds.

6. A method for monitoring the closed annulus of the inner and outer casings of an underwater wellhead, characterized in that: include: Acquire the temperature and pressure monitoring data of the underwater wellhead C annulus, and transmit it to the underwater wellhead B annulus through low-frequency electromagnetic communication, and then transmit it from the B annulus to the underwater wellhead A annulus through low-frequency electromagnetic communication; Acquire the temperature and pressure monitoring data of the underwater wellhead B annulus and transmit it to the underwater wellhead A annulus through low-frequency electromagnetic communication; Based on the low-frequency electromagnetic signal received by the underwater wellhead A annulus, the temperature and pressure monitoring information of the B annulus and the C annulus is obtained, and then the safety status of the closed annulus of the underwater wellhead is determined.

7. A method for monitoring the closed annulus of the inner and outer casings of an underwater wellhead as claimed in claim 6, characterized in that: The method of acquiring the temperature and pressure monitoring data of the underwater wellhead C annulus and transmitting the data to the underwater wellhead B annulus through low-frequency electromagnetic communication, and then transmitting the data from the B annulus to the underwater wellhead A annulus through low-frequency electromagnetic communication, comprises: The C annulus temperature and pressure monitoring device collects the C annulus temperature and pressure monitoring data in real time; The C annulus transmitting coil receives the temperature and pressure monitoring data of the C annulus and generates a first low-frequency electromagnetic signal, which is sent to the B annulus receiving coil, wherein the B annulus receiving coil and the C annulus transmitting coil are arranged at the same height and are located on both sides of the same area of ​​the B annulus casing wall; The B ring receiving coil sends the first low-frequency electromagnetic signal to a relay amplifier disposed in the B ring, and the relay amplifier amplifies the first low-frequency electromagnetic signal and transmits it to the first B ring transmitting coil; The first B annular space transmitting coil sends a first low-frequency electromagnetic signal to the first A annular space receiving coil, wherein the first A annular space receiving coil and the first B annular space transmitting coil are arranged at the same height and close to both sides of the same area of ​​the A annular space casing wall.

8. A method for monitoring the closed annulus of the inner and outer casings of an underwater wellhead as claimed in claim 6, characterized in that: The method of acquiring the temperature and pressure monitoring data of the underwater wellhead B annulus and transmitting the data to the underwater wellhead A annulus through low-frequency electromagnetic communication includes: The B annulus temperature and pressure monitoring device in the B annulus collects the temperature and pressure monitoring data of the B annulus in real time; The second B annulus transmitting coil receives the temperature and pressure monitoring data of the B annulus and generates a second low-frequency electromagnetic signal, which is sent to the second A annulus receiving coil, wherein the second A annulus receiving coil and the second B annulus transmitting coil are arranged at the same height and close to both sides of the same area of ​​the A annulus casing wall.

9. A processing device, characterized in that: It includes computer program instructions, wherein the computer program instructions, when executed by a processing device, are used to implement the steps corresponding to the method for monitoring the closed annulus of inner and outer casings of an underwater wellhead according to any one of claims 6 to 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, wherein the computer program instructions, when executed by a processor, are used to implement the steps corresponding to the method for monitoring the closed annulus of inner and outer casings of an underwater wellhead according to any one of claims 6 to 8.

Images