Split type deep water gas invasion monitoring system and gas invasion data processing method

Abstract

The application discloses a split type deepwater drilling gas invasion monitoring system and a gas invasion data processing method, wherein the split type deepwater drilling gas invasion monitoring system comprises an upper annular blowout preventer, an upper annular underwater monitoring host, a lower annular blowout preventer, a lower annular underwater monitoring host, a viscosity sensor, an ultrasonic probe, a temperature and pressure sensor and a water surface host. Since the gas invasion data are respectively time stamped in the annular underwater monitoring host and the lower annular underwater monitoring host, and the water surface host correlates the gas invasion data with the same time stamp and completes time stamp matching, the drilling fluid viscosity, the gas bubble echo and the temperature and pressure change in the riser collected by the viscosity sensor, the ultrasonic probe and the temperature and pressure sensor are not wrong, thereby solving the problem that the drilling fluid viscosity, the gas bubble echo and the temperature and pressure change in the riser collected by the viscosity sensor, the ultrasonic probe and the temperature and pressure sensor are not corresponding in time.

Description

Technical Field

[0001] This invention relates to the field of gas intrusion monitoring technology, specifically to a split-type deepwater drilling gas intrusion monitoring system and a gas intrusion data processing method. Background Technology

[0002] Gas intrusion within the riser is the biggest potential risk in deepwater oil and gas development. If gas intrusion is not identified and controlled in a timely manner, it will lead to a decrease in drilling fluid density and trigger a blowout.

[0003] Existing deep-water drilling gas intrusion monitoring systems mostly adopt a centralized acquisition architecture, connecting multiple sensors such as viscosity sensors, ultrasonic probes, and temperature and pressure sensors to the same underwater monitoring host for synchronous acquisition and uploading. However, in practical applications, these sensors need to be deployed in different locations depending on the monitoring object, installation space, and cable routing, and connected to different underwater monitoring hosts.

[0004] Currently, when multiple underwater monitoring hosts are used to collect sensor data from different locations, the viscosity, bubble echo, and temperature and pressure changes of the drilling fluid in the riser collected by the viscosity sensor, ultrasonic probe, and temperature and pressure sensor are prone to time discrepancies, which can affect the reliability of gas intrusion identification and early warning results. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a split-type deep-water drilling gas intrusion monitoring system and its data processing method. This system solves the problem that, in the current process of using multiple underwater monitoring hosts to collect sensor data from different locations, the viscosity, bubble echo, and temperature and pressure changes of the drilling fluid in the riser collected by the viscosity sensor, ultrasonic probe, and temperature and pressure sensor are prone to time discrepancies.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention discloses a split-type deepwater drilling gas intrusion monitoring system, comprising an upper annular blowout preventer, an upper annular underwater monitoring host, a lower annular blowout preventer, a lower annular underwater monitoring host, a viscosity sensor, an ultrasonic probe, a temperature and pressure sensor, and a surface host. The upper annular blowout preventer and the lower annular blowout preventer are respectively fixed to the underwater part of the riser, and the upper annular underwater monitoring host and the lower annular underwater monitoring host are respectively mounted on the upper annular blowout preventer and the lower annular blowout preventer; The viscosity sensor is mounted on the upper annular blowout preventer, and the signal acquisition end of the viscosity sensor extends into the water-proof pipe. The viscosity sensor is connected to the upper annular underwater monitoring host via a wire. The ultrasonic probe and the temperature and pressure sensor are mounted on the lower annular blowout preventer, and the signal acquisition ends of the ultrasonic probe and the temperature and pressure sensor extend into the water-proof pipe, respectively. The ultrasonic probe and the temperature and pressure sensor are connected to the lower annular blowout preventer via wires. The top of the riser extends upward to the offshore platform, and the surface host is installed on the offshore platform; the upper annular underwater monitoring host and the lower annular underwater monitoring host are connected to the surface host via wires. The viscosity sensor is used to collect the viscosity changes of the drilling fluid before and after gas intrusion into the riser. The ultrasonic probe is used to collect the echo of bubbles formed after air intrusion in the water-proof pipe and convert the echo into an echo signal. The temperature and pressure sensor is used to collect the temperature and pressure changes before and after air intrusion into the water-proof pipe. The upper annular underwater monitoring host is used to generate a timestamp on the viscosity change of the drilling fluid before and after gas intrusion in the riser, which is collected by the viscosity sensor. The lower ring underwater monitoring host is used to generate timestamps for the echo signals collected by the ultrasonic probe inside the water-proof pipe and for the temperature and pressure changes before and after air intrusion inside the water-proof pipe collected by the temperature and pressure sensor. The above-water host is used to establish associations and complete timestamp matching for air intrusion data with consistent timestamps.

[0007] Preferably, the upper annular underwater monitoring host is fixed to the upper annular blowout preventer by an upper annular fixing band; the lower annular underwater monitoring host is fixed to the lower annular blowout preventer by a lower annular fixing band.

[0008] Preferably, the ultrasonic probe is equipped with an ultrasonic signal excitation module and an echo signal processing module; the ultrasonic probe is disposed on the inner surface of the riser and includes a transmitting end and a receiving end, which are electrically connected. The transmitting end of the ultrasonic probe is connected to the ultrasonic signal excitation module via a wire; the echo signal processing module is connected to the receiving end of the ultrasonic probe via a wire; wherein, the ultrasonic signal excitation module is used to emit an excitation signal in real time, which excites the transmitting end of the ultrasonic probe to emit an ultrasonic signal; the ultrasonic signal propagates inside the riser, and once gas from the deep-water formation enters the riser of the deep-water drilling well and forms gas intrusion, the gas mixes with the drilling fluid to form bubbles, and the ultrasonic signal returns after detecting the bubbles, forming an echo; the receiving end of the ultrasonic probe is used to receive the echo and convert it into an echo signal; the echo signal processing module is used to receive and process the echo signal, thereby realizing the monitoring of gas intrusion during deep-water drilling operations.

[0009] Secondly, the present invention also discloses a gas intrusion data processing method, based on the aforementioned split-type deepwater drilling gas intrusion monitoring system, including... Step A: Acquisition of air intrusion data; Step B: Embed timestamps into the air intrusion data to form timestamp-embedded air intrusion data: Step C: Upload the gas intrusion data with embedded timestamps to the surface host. The surface host establishes a correlation between the three types of data—viscosity, temperature and pressure, and ultrasound—based on the timestamps, and outputs the data matched based on the timestamps.

[0010] Preferably, step A includes the following steps: The viscosity sensor collects the viscosity change of the drilling fluid before and after gas intrusion in the riser; the ultrasonic probe collects the echo of the bubbles formed after gas intrusion in the riser and converts the echo into an echo signal. The temperature and pressure sensor collects the temperature and pressure changes in the water-proof pipe before and after air intrusion. The gas invasion data consists of the viscosity changes of the drilling fluid before and after gas invasion, the echo signal after gas invasion, and the temperature and pressure changes before and after gas invasion.

[0011] The viscosity sensor collects the viscosity change of the drilling fluid before and after gas intrusion in the riser; the ultrasonic probe collects the echo of the bubbles formed after gas intrusion in the riser and converts the echo into an echo signal. The temperature and pressure sensor collects the temperature and pressure changes in the water-proof pipe before and after air intrusion. Among them, the viscosity change of drilling fluid before and after gas invasion, the echo signal after gas invasion, and the temperature and pressure changes before and after gas invasion together constitute the gas invasion data. Preferably, step B includes the following steps: Step B1: Embed timestamps into viscosity data The viscosity sensor transmits the viscosity changes of the drilling fluid before and after gas intrusion in the riser to the upper annular underwater monitoring host. The upper annular underwater monitoring host extracts the effective data field of the viscosity change of the drilling fluid, and then uses an independent monotonically increasing counter to generate a timestamp, and embeds the timestamp into the end of the data frame to achieve alignment and marking of the viscosity data in the gas intrusion data. Step B2: Embed timestamps into the ultrasound and thermobaric data respectively. The ultrasonic probe transmits the echo signal converted after gas intrusion into the diaphragm to the lower ring underwater monitoring host. The temperature and pressure sensor transmits the data on temperature and pressure changes before and after gas intrusion into the diaphragm to the lower ring underwater monitoring host. The lower ring underwater monitoring host extracts valid data fields from the echo signal converted after gas intrusion and the data on temperature and pressure changes before and after gas intrusion, respectively. Then, it uses an independent monotonically increasing counter to generate a timestamp and embeds the timestamp into the end of the data frame to achieve alignment and marking of the ultrasonic and temperature and pressure data.

[0012] When the surface host outputs data based on timestamp matching, the surface host processes the data from the upper ring underwater monitoring host and the lower ring underwater monitoring host in real time using a timestamp matching algorithm, establishes a correlation between data with consistent timestamps, and finally outputs the data.

[0013] Preferably, step C includes the following specific steps: Step C1: Create a viscosity data buffer and a thermobaric ultrasonic data buffer to temporarily store monitoring data to be processed. The viscosity data buffer stores unmatched viscosity data collected by the upper annular underwater monitoring host, and the thermobaric ultrasonic data buffer stores unmatched thermobaric ultrasonic data collected by the lower annular underwater monitoring host, until timestamp matching is completed and the data is output. Step C2: Receive monitoring data transmitted from the upper ring underwater monitoring host and the lower ring underwater monitoring host respectively; Step C3: Extract the timestamp field from the received monitoring data, traverse the temperature, pressure, ultrasonic and viscosity data buffers, and compare the timestamp of the monitoring data with the timestamp of each data group in the buffer; Step C4: When a timestamp matches, extract the complete data set corresponding to the timestamp from the temperature, pressure, ultrasonic, and viscosity data buffers. After associating the monitoring data with the complete data set, send it to the subsequent processing module for data fusion analysis. If no matching timestamp is found, temporarily store the currently received data in the viscosity and temperature, pressure, and ultrasonic buffers.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: (I) This invention discloses a split-type deepwater drilling gas intrusion monitoring system, comprising an upper annular blowout preventer, an upper annular subsea monitoring host, a lower annular blowout preventer, a lower annular subsea monitoring host, a viscosity sensor, an ultrasonic probe, a temperature and pressure sensor, and a surface host. The upper annular blowout preventer and the lower annular blowout preventer are respectively fixed to the subsea portion of the riser. The upper annular subsea monitoring host and the lower annular subsea monitoring host are respectively mounted on the upper annular blowout preventer and the lower annular blowout preventer. The viscosity sensor is mounted on the upper annular blowout preventer, and the signal acquisition end of the viscosity sensor extends into the riser. The viscosity sensor is connected to the upper annular subsea monitoring host via a wire. The ultrasonic probe and the temperature and pressure sensor are mounted on the lower annular blowout preventer, with their signal acquisition ends extending into the riser. The ultrasonic probe and temperature and pressure sensor are connected to the lower annular blowout preventer via wires. The top of the riser extends upwards to an offshore platform, where the surface-mounted main unit is located. The upper and lower annular underwater monitoring units are connected to the surface-mounted main unit via wires. The viscosity sensor is used to collect the viscosity changes of the drilling fluid before and after gas intrusion into the riser. The ultrasonic probe is used to collect the viscosity changes of the drilling fluid in the riser. The system generates echoes of bubbles formed after gas intrusion and converts these echoes into echo signals. The temperature and pressure sensor is used to collect temperature and pressure changes before and after gas intrusion within the riser. The upper annular underwater monitoring host is used to generate timestamps for the viscosity changes of the drilling fluid before and after gas intrusion within the riser collected by the viscosity sensor. The lower annular underwater monitoring host is used to generate timestamps for the echo signals collected by the ultrasonic probe within the riser and for the temperature and pressure changes before and after gas intrusion within the riser collected by the temperature and pressure sensor. The surface host is used to establish a correlation between gas intrusion data with consistent timestamps and complete timestamp matching. Because the gas intrusion data generates timestamps on both the annular and lower annular underwater monitoring hosts, and the surface host establishes a correlation between gas intrusion data with consistent timestamps and completes timestamp matching, the drilling fluid viscosity, bubble echo, and temperature and pressure changes collected by the viscosity sensor, ultrasonic probe, and temperature and pressure sensor in the riser will not be incorrect. This solves the problem of time discrepancies that easily occur in the drilling fluid viscosity, bubble echo, and temperature and pressure changes collected by the viscosity sensor, ultrasonic probe, and temperature and pressure sensor in the riser.

[0015] Furthermore, the present invention also has the following advantages: (a) This invention embeds timestamps into the data frames collected by each underwater monitoring host and matches the timestamps by the surface host, thereby realizing the temporal correlation of multi-source data between different monitoring nodes and solving the problem of unclear time correspondence between data such as viscosity, ultrasonic Doppler, temperature and pressure under distributed acquisition conditions.

[0016] (b) With the adoption of timestamp synchronization technology, different sensors do not need to be connected to the same underwater monitoring host to achieve data time domain correlation. Therefore, the sensors can be distributed in different locations according to the actual monitoring object, installation space and blowout preventer structure characteristics, which expands the range of sensor installation locations and improves the system's deployment flexibility and engineering adaptability in complex underwater wellhead structures.

[0017] (c) The underwater monitoring host used in this invention supports the configuration of the acquisition frequency through program updates, and the data acquisition strategy can be adjusted according to different monitoring objects and working conditions, thereby improving the engineering applicability of the system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the split-type deep-water drilling gas intrusion monitoring system provided in Embodiment 1 of the present invention.

[0019] Explanation of reference numerals in the attached diagram: 100 - water-proof pipe; 1-Upper annular blowout preventer; 10-Upper annular underwater monitoring unit; 2-Lower annular blowout preventer, 20-Lower annular underwater monitoring unit; 3-Viscosity sensor; 4-Ultrasonic probe; 5-Temperature and pressure sensor; 6-Floating main engine. Detailed Implementation

[0020] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0021] Example 1: A Split-Type Deepwater Drilling Gas Intrusion Monitoring System Embodiment 1 of the present invention provides a split-type deep-water drilling gas intrusion monitoring system, the structure of which will be described in detail below with reference to the accompanying drawings.

[0022] refer to Figure 1 This split-type deepwater drilling gas intrusion monitoring system is installed on the riser 100 below the offshore platform. It includes an upper annular blowout preventer 1, an upper annular underwater monitoring host 10, a lower annular blowout preventer 2, a lower annular underwater monitoring host 20, a viscosity sensor 3, an ultrasonic probe 4, a temperature and pressure sensor 5, and a surface host 6. The upper annular blowout preventer 1 and the lower annular blowout preventer 2 are respectively fixed to the underwater part of the riser 100, and the upper annular underwater monitoring host 10 and the lower annular underwater monitoring host 20 are respectively disposed on the upper annular blowout preventer 1 and the lower annular blowout preventer 2. The viscosity sensor 3 is mounted on the upper annular blowout preventer 1, and the signal acquisition end of the viscosity sensor 3 extends into the water-proof pipe 100. The viscosity sensor 3 is connected to the upper annular underwater monitoring host 10 via a wire. The ultrasonic probe 4 and the temperature and pressure sensor 5 are disposed on the lower annular blowout preventer 2, and the signal acquisition ends of the ultrasonic probe 4 and the temperature and pressure sensor 5 extend into the water-proof pipe 100 respectively. The ultrasonic probe 4 and the temperature and pressure sensor 5 are connected to the lower annular blowout preventer 2 by wire. The top of the riser 100 extends upward to the offshore platform, and the surface host 6 is installed on the offshore platform; the upper annular underwater monitoring host 10 and the lower annular underwater monitoring host 20 are connected to the surface host 6 via wires.

[0023] The viscosity sensor 3 is used to collect the viscosity change of the drilling fluid before and after gas intrusion into the riser 100. The ultrasonic probe 4 is used to collect the echo of bubbles formed after air intrusion in the water-proof pipe 100, and convert the echo into an echo signal. The temperature and pressure sensor 5 is used to collect the temperature and pressure changes in the water-proof pipe 100 before and after air intrusion. The upper annular underwater monitoring host 10 is used to generate a timestamp on the viscosity change of drilling fluid before and after gas intrusion in the riser 100 collected by the viscosity sensor 3. The lower ring underwater monitoring host 20 is used to generate timestamps for the echo signals collected by the ultrasonic probe 4 inside the water-proof pipe 100 and for the temperature and pressure changes before and after air intrusion collected by the temperature and pressure sensor 5 inside the water-proof pipe 100. The above-water host 6 is used to establish a correlation between air intrusion data with consistent timestamps and to complete timestamp matching.

[0024] It should be noted that the viscosity change of drilling fluid before and after gas intrusion in the riser 100 collected by the viscosity sensor 3, the echo signal collected by the ultrasonic probe 4, and the temperature and pressure changes before and after gas intrusion in the riser 100 collected by the temperature and pressure sensor 5 constitute the gas intrusion data of the present invention.

[0025] Since the gas intrusion data generates timestamps on the annular underwater monitoring host 10 and the lower annular underwater monitoring host 20 respectively, and the surface host 6 establishes a correlation between the gas intrusion data with consistent timestamps and completes timestamp matching, the drilling fluid viscosity, bubble echo and temperature and pressure changes in the riser collected by the viscosity sensor, ultrasonic probe and temperature and pressure sensor will not be wrong. This solves the problem that the drilling fluid viscosity, bubble echo and temperature and pressure changes in the riser collected by the viscosity sensor, ultrasonic probe and temperature and pressure sensor respectively are prone to time discrepancies.

[0026] Specifically, the upper annular underwater monitoring host 10 is fixed to the upper annular blowout preventer 1 by an upper annular fixing band. The lower annular underwater monitoring host 20 is fixed to the lower annular blowout preventer 2 by a lower annular fixing band.

[0027] Specifically, the upper ring underwater monitoring host 10, the lower ring underwater monitoring host 20, and the surface host 6 are connected by high-temperature and high-pressure resistant cables and use the RS485 industrial bus protocol for data communication and transmission.

[0028] Preferably, both the upper annular underwater monitoring host 10 and the lower annular underwater monitoring host 20 adopt an embedded single-chip microcomputer architecture. The sampling frequency can be freely configured in the low-frequency band through program modification, and the ultrasonic probe 4, temperature and pressure sensor 5, and viscosity sensor 3 can be synchronously sampled, preprocessed, and uploaded in real time.

[0029] It should be noted that the temperature and pressure sensor 5 and the viscosity sensor 3 are both mature existing technologies, so they will not be described in detail.

[0030] As a preferred implementation, the ultrasonic probe 4 is equipped with an ultrasonic signal excitation module and an echo signal processing module.

[0031] The ultrasonic probe 4 is disposed on the inner surface of the water-proof pipe 100 and includes a transmitting end and a receiving end. The transmitting end and the receiving end are electrically connected. The transmitting end of the ultrasonic probe is connected to the ultrasonic signal excitation module via a wire. The echo signal processing module is connected to the receiving end of the ultrasonic probe via a wire.

[0032] The ultrasonic signal excitation module is used to send an excitation signal in real time. The excitation signal excites the transmitting end of the ultrasonic probe, causing the transmitting end of the ultrasonic probe to emit an ultrasonic signal. The ultrasonic signal propagates in the riser 100. Once the gas under the deep water formation enters the riser 100 of the deep water well and forms gas intrusion, the gas mixes with the drilling fluid to form bubbles. After detecting the bubbles, the ultrasonic signal returns and forms an echo. The receiving end of the ultrasonic probe is used to receive the echo and convert the echo into an echo signal; The echo signal processing module is used to receive and process the echo signal, thereby enabling gas intrusion monitoring during deep-water drilling operations.

[0033] Example 2: A method for processing air intrusion data Embodiment 2 of the present invention provides a gas intrusion data processing method, which adopts the split-type deepwater drilling gas intrusion monitoring system of Embodiment 1. The method includes the following steps: Step A: Collection of air intrusion data The viscosity sensor 3 collects the viscosity change of the drilling fluid before and after gas intrusion in the riser 100; the ultrasonic probe 4 collects the echo of the bubbles formed after gas intrusion in the riser 100 and converts the echo into an echo signal. The temperature and pressure sensor 5 collects the temperature and pressure changes in the water-proof pipe 100 before and after air intrusion. The gas invasion data consists of the viscosity changes of the drilling fluid before and after gas invasion, the echo signal after gas invasion, and the temperature and pressure changes before and after gas invasion.

[0034] Step B: Embed timestamps into the air intrusion data to form timestamp-embedded air intrusion data, including: Step B1: Embed timestamps into viscosity data The viscosity sensor 3 transmits the viscosity change of the drilling fluid before and after gas intrusion in the riser 100 to the upper ring underwater monitoring host 10. The upper ring underwater monitoring host 10 extracts the effective data field of the viscosity change of the drilling fluid, and then uses an independent monotonically increasing counter to generate a timestamp and embeds the timestamp into the end of the data frame to achieve alignment and marking of viscosity data in the gas intrusion data. Step B2: Embed timestamps into the ultrasound and thermobaric data respectively. The ultrasonic probe 4 transmits the echo signal converted after gas intrusion in the water-proof pipe 100 to the lower ring underwater monitoring host 20. The temperature and pressure sensor 5 transmits the data on temperature and pressure changes before and after gas intrusion in the water-proof pipe 100 to the lower ring underwater monitoring host 20. The lower ring underwater monitoring host 20 extracts valid data fields from the echo signal converted after gas intrusion and the data on temperature and pressure changes before and after gas intrusion, respectively. Then, it uses an independent monotonically increasing counter to generate a timestamp and embeds the timestamp into the end of the data frame to achieve alignment and marking of the ultrasonic and temperature and pressure data.

[0035] Step C: Upload the gas intrusion data with embedded timestamps to the surface host 6. The surface host 6 establishes a correlation between the three types of data—viscosity, temperature and pressure, and ultrasound—based on the timestamps, and outputs the data matched based on the timestamps.

[0036] When the surface host 6 outputs data based on timestamp matching, the surface host 6 processes the data from the upper ring underwater monitoring host 10 and the lower ring underwater monitoring host 20 in real time using a timestamp matching algorithm, establishes a correlation between data with consistent timestamps, and finally outputs the data.

[0037] More specifically, step C includes the following specific steps: Step C1: Create a viscosity data buffer and a thermobaric ultrasonic data buffer to temporarily store monitoring data to be processed. The viscosity data buffer stores unmatched viscosity data collected by the upper annular underwater monitoring host 10, and the thermobaric ultrasonic data buffer stores unmatched thermobaric ultrasonic data collected by the lower annular underwater monitoring host 20, until timestamp matching is completed and the data is output. Step C2: Receive monitoring data transmitted from the upper ring underwater monitoring host 10 and the lower ring underwater monitoring host 20 respectively; Step C3: Extract the timestamp field from the received monitoring data, traverse the temperature, pressure, ultrasonic and viscosity data buffers, and compare the timestamp of the monitoring data with the timestamp of each data group in the buffer; Step C4: When a timestamp matches, extract the complete data set corresponding to the timestamp from the temperature, pressure, ultrasonic, and viscosity data buffers. After associating the monitoring data with the complete data set, send it to the subsequent processing module for data fusion analysis. If no matching timestamp is found, temporarily store the currently received data in the viscosity and temperature, pressure, and ultrasonic buffers.

[0038] More specifically, the subsequent processing module uses a trained neural network model for analysis. The input parameters of the model include real-time ultrasonic data, viscosity data, temperature and pressure data, and historical monitoring data. The output result is the probability of gas intrusion. The neural network adopts a fully connected layer structure and is trained with a labeled dataset to achieve intelligent identification and early warning of gas intrusion.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A split-type deepwater drilling gas intrusion monitoring system, characterized in that, It includes an upper annular blowout preventer (1), an upper annular underwater monitoring host (10), a lower annular blowout preventer (2), a lower annular underwater monitoring host (20), a viscosity sensor (3), an ultrasonic probe (4), a temperature and pressure sensor (5), and a surface host (6). The upper annular blowout preventer (1) and the lower annular blowout preventer (2) are respectively fixed to the underwater part of the riser (100), and the upper annular underwater monitoring host (10) and the lower annular underwater monitoring host (20) are respectively disposed on the upper annular blowout preventer (1) and the lower annular blowout preventer (2). The viscosity sensor (3) is mounted on the upper annular blowout preventer (1), and the signal acquisition end of the viscosity sensor (3) extends into the water-proof pipe (100). The viscosity sensor (3) is connected to the upper annular underwater monitoring host (10) via a wire. The ultrasonic probe (4) and the temperature and pressure sensor (5) are disposed on the lower annular blowout preventer (2), and the signal acquisition ends of the ultrasonic probe (4) and the temperature and pressure sensor (5) are respectively inserted into the water-proof pipe (100). The ultrasonic probe (4) and the temperature and pressure sensor (5) are connected to the lower annular blowout preventer (2) by wire. The top of the riser (100) extends upward to the offshore platform, and the marine main unit (6) is installed on the offshore platform; the upper annular underwater monitoring main unit (10) and the lower annular underwater monitoring main unit (20) are connected to the marine main unit (6) by wires. The viscosity sensor (3) is used to collect the viscosity change of drilling fluid before and after gas intrusion in the riser (100); The ultrasonic probe (4) is used to collect the echo of the bubbles formed after the gas intrusion in the water-proof pipe (100) and convert the echo into an echo signal. The temperature and pressure sensor (5) is used to collect the temperature and pressure changes in the water-proof pipe (100) before and after air intrusion; The upper annular underwater monitoring host (10) is used to generate a timestamp for the viscosity change of drilling fluid before and after gas intrusion in the riser (100) collected by the viscosity sensor (3); The lower ring underwater monitoring host (20) is used to generate timestamps for the echo signals collected by the ultrasonic probe (4) in the water-proof pipe (100) and for the temperature and pressure changes in the water-proof pipe (100) before and after air intrusion collected by the temperature and pressure sensor (5). The above-water host (6) is used to establish a connection between air intrusion data with consistent timestamps and complete timestamp matching.

2. The split-type deepwater drilling gas intrusion monitoring system according to claim 1, characterized in that, The upper annular underwater monitoring host (10) is fixed to the upper annular blowout preventer (1) by an upper annular fixing band; The lower annular underwater monitoring host (20) is fixed to the lower annular blowout preventer (2) by a lower annular fixing band.

3. The split-type deepwater drilling gas intrusion monitoring system according to claim 2, characterized in that, The ultrasonic probe (4) is equipped with an ultrasonic signal excitation module and an echo signal processing module; The ultrasonic probe (4) is disposed on the inner surface of the water-proof pipe (100) and includes a transmitting end and a receiving end. The transmitting end and the receiving end are electrically connected. The transmitting end of the ultrasonic probe is connected to the ultrasonic signal excitation module via a wire. The echo signal processing module is connected to the receiving end of the ultrasonic probe via a wire. The ultrasonic signal excitation module is used to send an excitation signal in real time, which excites the transmitting end of the ultrasonic probe to emit an ultrasonic signal. The ultrasonic signal propagates in the riser (100). Once the gas under the deep water formation enters the riser (100) of the deep water well and forms gas intrusion, the gas mixes with the drilling fluid to form bubbles. The ultrasonic signal detects the bubbles and returns to form an echo. The receiving end of the ultrasonic probe is used to receive the echo and convert the echo into an echo signal; The echo signal processing module is used to receive and process the echo signal, thereby enabling gas intrusion monitoring during deep-water drilling operations.

4. A gas intrusion data processing method, based on the split-type deepwater drilling gas intrusion monitoring system according to any one of claims 1 to 3, characterized in that, include Step A: Acquisition of air intrusion data; Step B: Embed timestamps into the air intrusion data to form timestamp-embedded air intrusion data: Step C: Upload the air intrusion data with embedded timestamps to the surface host (6). The surface host (6) establishes a correlation between the three types of data, namely viscosity, temperature and pressure and ultrasound, based on the timestamps, and outputs the data matched based on the timestamps.

5. The air intrusion data processing method according to claim 4, characterized in that, Step A includes the following steps: The viscosity sensor (3) collects the viscosity changes of the drilling fluid before and after gas intrusion into the riser (100); The ultrasonic probe (4) collects the echo of the air bubbles formed after air intrusion in the water-proof pipe (100) and converts the echo into an echo signal; The temperature and pressure sensor (5) collects the temperature and pressure changes in the water-proof pipe (100) before and after air intrusion; The gas invasion data consists of the viscosity changes of the drilling fluid before and after gas invasion, the echo signal after gas invasion, and the temperature and pressure changes before and after gas invasion.

6. The air intrusion data processing method according to claim 5, characterized in that, Step B includes the following steps: Step B1: Embed timestamps into viscosity data The viscosity sensor (3) transmits the viscosity change of the drilling fluid before and after gas intrusion in the riser (100) to the upper ring underwater monitoring host (10). The upper ring underwater monitoring host (10) extracts the effective data field of the viscosity change of the drilling fluid, and then uses an independent monotonically increasing counter to generate a timestamp and embeds the timestamp into the end of the data frame to realize the alignment and marking of viscosity data in the gas intrusion data. Step B2: Embed timestamps into the ultrasound and thermobaric data respectively. The ultrasonic probe (4) transmits the echo signal converted after air intrusion in the water-proof pipe (100) to the lower ring underwater monitoring host (20). The temperature and pressure sensor (5) transmits the data of temperature and pressure changes before and after air intrusion in the water-proof pipe (100) to the lower ring underwater monitoring host (20). The lower ring underwater monitoring host (20) extracts the effective data fields of the echo signal converted after air intrusion and the data of temperature and pressure changes before and after air intrusion, respectively. Then, it uses an independent monotonically increasing counter to generate a timestamp and embeds the timestamp into the end of the data frame to realize the alignment and marking of the ultrasonic and temperature and pressure data.

7. The air intrusion data processing method according to claim 6, characterized in that, When the surface host (6) outputs data based on timestamp matching, the surface host (6) processes the data from the upper ring underwater monitoring host (10) and the lower ring underwater monitoring host (20) in real time using a timestamp matching algorithm, establishes a connection between data with consistent timestamps, and finally outputs the data.

8. The air intrusion data processing method according to claim 7, characterized in that, Step C includes the following specific steps: Step C1: Create a viscosity data buffer and a thermobaric ultrasonic data buffer to temporarily store the monitoring data to be processed; wherein, the viscosity data buffer stores the unmatched viscosity data collected by the upper annular underwater monitoring host (10), and the thermobaric ultrasonic data buffer stores the unmatched thermobaric ultrasonic data collected by the lower annular underwater monitoring host (20) until the timestamp matching is completed and then output. Step C2: Receive monitoring data transmitted from the upper ring underwater monitoring host (10) and the lower ring underwater monitoring host (20) respectively; Step C3: Extract the timestamp field from the received monitoring data, traverse the temperature, pressure, ultrasonic and viscosity data buffers, and compare the timestamp of the monitoring data with the timestamp of each data group in the buffer; Step C4: When a timestamp matches, extract the complete data set corresponding to the timestamp from the temperature, pressure, ultrasonic, and viscosity data buffers. After associating the monitoring data with the complete data set, send it to the subsequent processing module for data fusion analysis. If no matching timestamp is found, temporarily store the currently received data in the viscosity and temperature, pressure, and ultrasonic buffers.

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