Deepwater blowout preventer for early warning of gas cut

Abstract

The invention relates to a deepwater blowout preventer for early warning of gas cut, which comprises a group of temperature and pressure integrated sensors, a group of viscosity sensors and two groups of ultrasonic Doppler sensors, and the temperature and pressure integrated sensors and the viscosity sensors are arranged on one side of the interior of an upper ring part of a blowout preventer main body in parallel; probes of the temperature and pressure integrated sensor and the viscosity sensor just touch but do not penetrate into the annular space; the two sets of ultrasonic Doppler sensors are arranged on the two sides of the interior of the lower ring part of the blowout preventer body correspondingly, and a probe of each set of ultrasonic Doppler sensor just makes contact with the annular space but does not penetrate into the annular space. Wherein the annular space is used for injecting drilling fluid; the temperature and pressure integrated sensor is used for collecting the temperature and pressure of drilling fluid in the blowout preventer; the viscosity sensor is used for collecting the viscosity of drilling fluid in the blowout preventer; the ultrasonic Doppler sensor is used for collecting the frequency change of drilling fluid in the blowout preventer.

Description

Technical Field

[0001] The invention relates to the technical field of deepwater drilling, and in particular to a deepwater blowout preventer for early warning of gas intrusion. Background Art

[0002] Gas invasion refers to the phenomenon that gas in the formation enters the drilling fluid during deep-sea drilling operations. Once gas invasion occurs, it will cause changes in parameters such as the density and viscosity of the drilling fluid, and the pressure inside and outside the pipe will be unbalanced. After deterioration, it will cause a blowout, endangering the economy, personnel safety and the environment. For example, the blowout incident in the Gulf of Mexico in 2010 caused 7 serious injuries, 11 missing persons, and a loss of 4.9 million barrels of crude oil, causing serious pollution to the local ocean. This major blowout accident was caused by the fact that gas invasion was not discovered in time during mud replacement and well control was not timely. Therefore, the safety of drilling operations has put forward an urgent need for early gas invasion monitoring and early warning.

[0003] In short, the current deepwater blowout preventer needs to provide early warning for gas invasion. However, in the process of early warning for gas invasion, it is necessary to collect parameters such as temperature, pressure, viscosity and ultrasonic Doppler parameters of the drilling fluid in the blowout preventer, but there is currently a lack of corresponding collection equipment. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a deepwater blowout preventer for early warning of gas invasion and a method of using the same, so as to solve the problem that the current deepwater blowout preventer lacks equipment for collecting the temperature, pressure, viscosity and ultrasonic Doppler parameters of the drilling fluid in the blowout preventer when performing early warning of gas invasion.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The invention discloses a deepwater blowout preventer for early warning of gas invasion, comprising a blowout preventer body, wherein the blowout preventer body comprises an upper ring portion, a middle portion and a lower ring portion, wherein the upper ring portion and the lower ring portion of the blowout preventer body are connected through the middle portion; a central channel is arranged inside the blowout preventer body, wherein the central channel sequentially penetrates the upper ring portion, the middle portion and the lower ring portion of the blowout preventer body from top to bottom; a drill rod is inserted into the central channel, and an annular space is formed between the drill rod and the inner wall of the central channel,

[0007] The deepwater blowout preventer for early warning of gas intrusion also includes a set of integrated temperature and pressure sensors, a set of viscosity sensors and two sets of ultrasonic Doppler sensors.

[0008] The temperature-pressure integrated sensor and the viscosity sensor are arranged in parallel on one side of the upper ring portion of the blowout preventer body, and the probes of the temperature-pressure integrated sensor and the viscosity sensor are close to one side of the central channel and just touch but do not penetrate into the annular space;

[0009] Two groups of ultrasonic Doppler sensors are respectively arranged on both sides of the lower ring portion of the blowout preventer body, and the probe of each group of ultrasonic Doppler sensors is close to one side of the central channel and just touches but does not penetrate into the annular space;

[0010] The temperature-pressure integrated sensor, the viscosity sensor and the two groups of ultrasonic Doppler sensors are all provided with joints reserved on the side of the blowout preventer body, and the joints of the temperature-pressure integrated sensor, the viscosity sensor and the ultrasonic Doppler sensor are respectively connected to their respective probes;

[0011] Wherein, the annular space is used for injecting drilling fluid;

[0012] The temperature and pressure integrated sensor is used to collect the temperature and pressure of the drilling fluid in the blowout preventer;

[0013] The viscosity sensor is used to collect the viscosity of the drilling fluid in the blowout preventer;

[0014] The ultrasonic Doppler sensor is used to collect frequency changes of the drilling fluid in the blowout preventer.

[0015] Preferably, the temperature-pressure integrated sensor comprises a temperature-pressure integrated sensor rod, and the two ends of the temperature-pressure integrated sensor rod are respectively provided with a temperature-pressure integrated sensor probe and a temperature-pressure integrated sensor connector, and the temperature-pressure integrated sensor connector is connected to the temperature-pressure integrated sensor probe by wire;

[0016] The viscosity sensor comprises a viscosity sensor rod, and the two ends of the viscosity sensor rod are respectively provided with a viscosity sensor probe and a viscosity sensor joint, and the viscosity sensor joint is connected to the viscosity sensor probe through a wire.

[0017] Preferably, a double sensor groove is provided inside the upper ring portion of the blowout preventer body, and the double sensor groove is communicated with the annular space, and the temperature-pressure integrated sensor and the viscosity sensor are jointly provided in the double sensor groove.

[0018] Preferably, the central channel is a cylindrical through hole, and the temperature-pressure integrated sensor probe and the viscosity sensor probe are flush and tangent to the arc-shaped wall surface of the central channel.

[0019] Preferably, a temperature-pressure viscosity flange is provided on the side of the upper ring portion of the blowout preventer body, the temperature-pressure viscosity flange is arranged at the outer end of the dual sensor groove, and the temperature-pressure viscosity flange is fixed to the side of the upper ring portion of the blowout preventer body through a flange connection, and the outer ends of the constant temperature-pressure integrated sensor and the viscosity sensor are connected to the temperature-pressure viscosity flange to fix the outer ends of the temperature-pressure integrated sensor and the viscosity sensor.

[0020] Preferably, a temperature-pressure integrated sensor flange is provided at the end where the temperature-pressure integrated sensor connector of the temperature-pressure integrated sensor is located, the temperature-pressure integrated sensor connector is configured on the temperature-pressure integrated sensor flange, and the temperature-pressure integrated sensor connector is detachably sleeved on the end of the temperature-pressure integrated sensor rod;

[0021] The eccentric flange is provided with a plurality of inner side flange holes, the center of the inner side flange hole is provided with an inner side connection hole of a temperature-pressure viscosity flange, the outer side of the temperature-pressure viscosity flange is provided with an outer side joint of a temperature-pressure viscosity flange, and the outer side joint of the temperature-pressure viscosity flange is connected to the inner side connection hole of the temperature-pressure viscosity flange by wire;

[0022] When the temperature-pressure viscosity flange is docked with the temperature-pressure integrated sensor, the temperature-pressure integrated sensor flange is located on the inner side of the temperature-pressure viscosity flange, the inner side flange hole of the temperature-pressure viscosity flange is connected to the temperature-pressure integrated sensor flange of the temperature-pressure integrated sensor through a flange, and the temperature-pressure integrated sensor connector is just inserted into the inner side connection hole of the temperature-pressure viscosity flange.

[0023] Preferably, a viscosity sensor flange is provided at the end of the viscosity sensor rod where the viscosity sensor joint is located, the viscosity sensor flange is sleeved on the end of the viscosity sensor rod, and the viscosity sensor joint is detachably sleeved on the end of the viscosity sensor rod;

[0024] The eccentric flange is also provided with a viscosity sensor rod through-hole.

[0025] The outer side of the temperature and pressure viscosity flange is provided with an outer side flange hole,

[0026] When the temperature and pressure viscosity flange is docked with the viscosity sensor, the viscosity sensor flange is located on the outside of the temperature and pressure viscosity flange, the flange hole on the outer side of the temperature and pressure viscosity flange is connected to the viscosity sensor flange of the viscosity sensor through a flange, and the viscosity sensor rod of the viscosity sensor just passes through the viscosity sensor rod through the viscosity sensor rod through-hole of the temperature and pressure viscosity flange, exposing the end of the viscosity sensor rod, and the viscosity sensor joint is sleeved on the end of the viscosity sensor rod.

[0027] Preferably, each of the ultrasonic Doppler sensors comprises an ultrasonic Doppler sensor rod, and both ends of the ultrasonic Doppler sensor rod are respectively provided with an ultrasonic Doppler sensor probe and an ultrasonic Doppler sensor connector, and the ultrasonic Doppler sensor probe and the ultrasonic Doppler sensor connector of the ultrasonic Doppler sensor are connected by wire.

[0028] Preferably, a left ultrasonic Doppler sensor slot and a right ultrasonic Doppler sensor slot are symmetrically arranged on both sides of the interior of the lower ring portion of the blowout preventer body about the longitudinal center line of the central channel, the inner ends of the left ultrasonic Doppler sensor slot and the right ultrasonic Doppler sensor slot are respectively communicated with the annular space, a group of ultrasonic Doppler sensors are respectively arranged in the left ultrasonic Doppler sensor slot and the right ultrasonic Doppler sensor slot, and the ultrasonic Doppler sensor probes of the two groups of ultrasonic Doppler sensors are close to one side of the central channel and just touch but do not penetrate into the annular space;

[0029] The outer ends of the left ultrasonic Doppler sensor slot and the right ultrasonic Doppler sensor slot are respectively provided with ultrasonic Doppler sensor flanges, and the outer ends of the two groups of ultrasonic Doppler sensors are connected through flanges and fixed to the side of the lower ring part of the blowout preventer body.

[0030] Preferably, an ultrasonic Doppler sensor flange is arranged at the outer end of the ultrasonic Doppler sensor rod of each ultrasonic Doppler sensor, an ultrasonic Doppler sensor connector is arranged on the ultrasonic Doppler sensor flange, and the ultrasonic Doppler sensor flange is detachably connected to the outer end of the ultrasonic Doppler sensor rod;

[0031] A second flange is provided on the inner side of the ultrasonic Doppler sensor flange, and a second flange hole is provided on the second flange for docking the ultrasonic Doppler sensor flange of the ultrasonic Doppler sensor;

[0032] The center of the second flange hole is provided with an inner side connection hole of the ultrasonic Doppler sensor flange.

[0033] An ultrasonic Doppler sensor flange outer connector is disposed at the center of the outer side surface of the ultrasonic Doppler sensor flange, and the ultrasonic Doppler sensor flange inner connector hole is connected to the ultrasonic Doppler sensor flange outer connector via a wire;

[0034] When the ultrasonic Doppler sensor flange is docked with the ultrasonic Doppler sensor, the ultrasonic Doppler sensor flange is located on the inner side of the ultrasonic Doppler sensor flange, the second flange hole of the ultrasonic Doppler sensor flange is connected to the ultrasonic Doppler sensor flange of the ultrasonic Doppler sensor through a flange, and the ultrasonic Doppler sensor connector of the ultrasonic Doppler sensor is just inserted into the inner connecting hole of the ultrasonic Doppler sensor flange.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] (I) The present invention discloses a deepwater blowout preventer for early warning of gas intrusion, comprising a group of integrated temperature and pressure sensors, a group of viscosity sensors and two groups of ultrasonic Doppler sensors, wherein the integrated temperature and pressure sensors and the viscosity sensors are arranged in parallel on one side of the upper ring portion of the blowout preventer body, and the probes of the integrated temperature and pressure sensors and the viscosity sensors are close to one side of the central channel and just touch the annular space without penetrating; the two groups of ultrasonic Doppler sensors are respectively arranged on both sides of the lower ring portion of the blowout preventer body, and the probes of each group of ultrasonic Doppler sensors are close to one side of the central channel and just touch the annular space without penetrating; the integrated temperature and pressure sensors, the viscosity sensors and the two groups of ultrasonic Doppler sensors are all provided with connectors reserved on the side of the blowout preventer body, and the connectors of the integrated temperature and pressure sensors, the viscosity sensors and the ultrasonic Doppler sensors are respectively connected to their respective probes. The annular space is used to inject drilling fluid; the integrated temperature and pressure sensor is used to collect the temperature and pressure of the drilling fluid in the blowout preventer; the viscosity sensor is used to collect the viscosity of the drilling fluid in the blowout preventer; and the ultrasonic Doppler sensor is used to collect the frequency change of the drilling fluid in the blowout preventer. The deepwater blowout preventer for early warning of gas intrusion disclosed in the present invention can collect the temperature, pressure, viscosity and ultrasonic Doppler parameters of the drilling fluid in the blowout preventer, solving the problem that the current deepwater blowout preventer lacks equipment for collecting the temperature, pressure, viscosity and ultrasonic Doppler parameters of the drilling fluid in the blowout preventer when performing early warning of gas intrusion.

[0037] (ii) The present invention discloses a deepwater blowout preventer for early warning of gas invasion. The monitoring probe is in direct contact with the drilling fluid, without the barrier of the thick wall of the riser, and does not require coupling agent. The measurement accuracy is high and it is suitable for long-term use. A high-precision temperature and pressure integrated sensor, viscosity sensor and ultrasonic Doppler sensor are used to collect various parameters such as the temperature and pressure, viscosity and frequency change of the drilling fluid in the blowout preventer. Early warning of gas invasion is carried out through the comprehensive analysis of various parameters, and the early warning result is highly reliable. The monitoring probe monitors the drilling fluid in the annulus of the blowout preventer. Compared with the monitoring position of the riser monitoring method, the mud pool monitoring method and the comprehensive logging method, the control cable is used to transmit the monitoring data at a high speed, and the early warning of gas invasion is highly real-time, and the well control time window is more sufficient. The deepwater blowout preventer for early warning of gas invasion disclosed by the present invention realizes real-time monitoring of the temperature, pressure, viscosity and ultrasonic Doppler data of the drilling fluid in the annulus of the blowout preventer, combines the collected multiple parameters to carry out early warning of gas invasion, and performs well control according to the warning results to avoid blowout.

[0038] (III) The present invention proposes a deepwater blowout preventer for early warning of gas intrusion, which utilizes a temperature and pressure integrated sensor, a viscosity sensor, and an ultrasonic Doppler sensor to monitor the drilling fluid in the annulus of the blowout preventer in real time and collect relevant parameters to perform early gas intrusion monitoring and early warning, thereby providing data support for well control. The invention has the characteristics of small hysteresis, high integration, and high precision, meets the needs of gas intrusion monitoring during deepwater drilling, and improves the safety of deepwater drilling.

[0039] In addition, the present invention also has the following advantages:

[0040] 1. The design of an immersion ultrasonic Doppler sensor does not require a coupling agent, which solves the problem that the riser monitoring method is not suitable for long-term use due to the easy dilution of the coupling agent, and avoids the huge attenuation of the ultrasonic wave by the pipe wall, thus improving the monitoring accuracy.

[0041] 2. The parameter acquisition components and underwater monitoring host are directly integrated with the deepwater blowout preventer, and are lowered to the inlet with the blowout preventer during deepwater drilling operations, solving the problem of low integration of the riser monitoring method and not taking up drilling time for installation.

[0042] 3. The parameter acquisition component is located in the blowout preventer, at the bottom of the seawater section of deepwater drilling. It is lower than the riser monitoring method, mud pool monitoring method and comprehensive logging monitoring method. The control cable is used to transmit the monitoring data at high speed to ensure the real-time data, which can reflect the drilling fluid performance and gas invasion status under the influence of deepwater high pressure and high temperature.

[0043] 4. Combining the temperature, pressure, viscosity and ultrasonic Doppler multi-type parameters of the BOP annulus drilling fluid, combined with historical data, early warning of gas invasion status is provided. The warning result is higher than that of the single parameter warning method (riser monitoring method) and does not rely on professional interpretation. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the overall structure of a deepwater blowout preventer provided in Example 1 of the present invention;

[0045] Figure 2 A schematic structural diagram of a blowout preventer body provided in Example 1 of the present invention;

[0046] Figure 3 A longitudinal cross-sectional view of a blowout preventer body provided in Example 1 of the present invention;

[0047] Figure 4 A schematic diagram of the structure of the integrated temperature and pressure sensor provided in Example 1 of the present invention;

[0048] Figure 5 A schematic diagram of the structure of a viscosity sensor provided in Example 1 of the present invention;

[0049] Figure 6 A schematic structural diagram of the inner side of the temperature-pressure viscosity flange provided in Example 1 of the present invention;

[0050] Figure 7 A schematic structural diagram of the outer side surface of a temperature-pressure viscosity flange provided in Example 1 of the present invention;

[0051] Figure 8 A schematic diagram of the structure of an ultrasonic Doppler sensor provided in Example 1 of the present invention;

[0052] Fig. 9 A schematic structural diagram of the inner side surface of the ultrasonic Doppler sensor flange provided in Example 1 of the present invention;

[0053] Fig.10 A schematic structural diagram of the outer side surface of the ultrasonic Doppler sensor flange provided in Example 1 of the present invention;

[0054] Fig.11 A schematic diagram of the structure of an upper annular underwater monitoring host provided in Example 2 of the present invention;

[0055] Fig.12 This is a schematic diagram of the structure of the lower annular underwater monitoring host provided in Example 2 of the present invention.

[0056] Description of reference numerals: 100 - central channel, 101 - drill pipe, 102 - annular space;

[0057] 1- BOP body, 11- upper ring, 12- temperature and pressure viscosity flange, 121- eccentric flange, 122- inner side flange hole, 123- inner side connection hole of temperature and pressure viscosity flange, 124- outer side joint of temperature and pressure viscosity flange, 125- viscosity sensor rod through hole, 126- outer side flange hole; 13- lower ring, 14- ultrasonic Doppler sensor flange, 141- second flange, 142- second flange hole, 143- inner side connection hole of ultrasonic Doppler sensor flange, 144- outer side joint of ultrasonic Doppler sensor flange; 15- fixing band;

[0058] 21-temperature and pressure integrated sensor, 210-temperature and pressure integrated sensor rod, 211-temperature and pressure integrated sensor probe, 212-temperature and pressure integrated sensor connector, 213-temperature and pressure integrated sensor flange;

[0059] 22-viscosity sensor, 220-viscosity sensor rod, 221-viscosity sensor probe, 222-viscosity sensor connector, 223-viscosity sensor flange;

[0060] 23-ultrasonic Doppler sensor, 230-ultrasonic Doppler sensor rod, 231-ultrasonic Doppler sensor probe, 232-ultrasonic Doppler sensor connector, 233-ultrasonic Doppler sensor flange;

[0061] 31-upper annular underwater monitoring host, 310-temperature, pressure and viscosity input connector, 311-temperature, pressure and viscosity output connector; 32-lower annular underwater monitoring host, 320-ultrasonic Doppler parameter input connector, 321-ultrasonic Doppler parameter output connector; 33-underwater electronic cabin; 34-industrial computer; 35-wire change box. DETAILED DESCRIPTION

[0062] 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.

[0063] In order to solve the problem that the current deepwater blowout preventer lacks equipment for collecting temperature, pressure, viscosity and ultrasonic Doppler parameters of the drilling fluid in the blowout preventer when performing early warning of gas invasion, the present invention proposes a deepwater blowout preventer for early warning of gas invasion, which uses a temperature and pressure integrated sensor, a viscosity sensor and an ultrasonic Doppler sensor to monitor the drilling fluid in the annulus of the blowout preventer in real time, and collect parameters such as temperature and pressure, viscosity and frequency change of the drilling fluid.

[0064] Example 1: A deepwater blowout preventer for early warning of gas intrusion

[0065] Embodiment 1 provides a deepwater blowout preventer for early warning of gas intrusion, and its structure and connection relationship are described in detail below with reference to the accompanying drawings.

[0066] The deepwater blowout preventer for early warning of gas invasion comprises a blowout preventer body 1 and a parameter acquisition component.

[0067] refer to Figures 1 to 3 The blowout preventer body 1 comprises an upper ring portion 11, a middle portion and a lower ring portion 13, wherein the upper ring portion 11 and the lower ring portion 13 of the blowout preventer body 1 are connected through the middle portion; a central channel 100 is arranged inside the blowout preventer body 1, and the central channel 100 sequentially penetrates the upper ring portion 11, the middle portion and the lower ring portion 13 of the blowout preventer body 1 from top to bottom; a drill pipe 101 is inserted into the central channel 100, and an annular space 102 is formed between the drill pipe 101 and the inner wall of the central channel 100.

[0068] refer to Figure 4 , Figure 5 and Figure 8 The parameter acquisition component includes a set of temperature and pressure integrated sensors 21, a set of viscosity sensors 22 and two sets of ultrasonic Doppler sensors 23.

[0069] Continue to refer Figure 3 The temperature-pressure integrated sensor 21 and the viscosity sensor 22 are arranged in parallel on one side of the upper ring portion 11 of the blowout preventer body 1, and the probes of the temperature-pressure integrated sensor 21 and the viscosity sensor 22 are close to one side of the central channel 100 and just touch but do not penetrate into the annular space 102. The "parallel arrangement" means that the temperature-pressure integrated sensor 21 and the viscosity sensor 22 are combined and the two ends are flush.

[0070] Two groups of ultrasonic Doppler sensors 23 are respectively arranged on both sides of the lower ring portion 13 of the BOP body 1 , and the probe of each group of ultrasonic Doppler sensors 23 is close to one side of the central channel 100 and just touches but does not penetrate into the annular space 102 .

[0071] The temperature-pressure integrated sensor 21, the viscosity sensor 22 and the two groups of ultrasonic Doppler sensors 23 are all provided with connectors reserved on the side of the blowout preventer body 1, and the connectors of the temperature-pressure integrated sensor 21, the viscosity sensor 22 and the ultrasonic Doppler sensor 23 are respectively connected to their respective probes.

[0072] The blowout preventer body 1 has the functions of emergency release, automatic sealing and automatic shutdown. The blowout preventer body 1 is equipped with an industrial computer 34 and an early warning device. When encountering early gas invasion, the industrial computer 34 controls the early warning device to issue a gas invasion warning, and the blowout preventer will close the wellhead in time and quickly, thereby preventing a blowout accident.

[0073] The annular space 102 is used to inject drilling fluid;

[0074] The temperature and pressure integrated sensor 21 includes a temperature sensor and a pressure sensor, which are used to collect the temperature and pressure of the drilling fluid in the blowout preventer;

[0075] The viscosity sensor 22 is used to collect the viscosity of the drilling fluid in the blowout preventer;

[0076] The ultrasonic Doppler sensor 23 is used to collect ultrasonic Doppler parameters of the drilling fluid in the blowout preventer, namely, frequency shift and frequency change.

[0077] Specifically, continue to refer to Figure 4 The temperature-pressure integrated sensor 21 includes a temperature-pressure integrated sensor rod 210, and the two ends of the temperature-pressure integrated sensor rod 210 are respectively provided with a temperature-pressure integrated sensor probe 211 and a temperature-pressure integrated sensor connector 212, and the temperature-pressure integrated sensor connector 212 is connected to the temperature-pressure integrated sensor probe 211 by wire.

[0078] The integrated temperature and pressure sensor probe 211 is used for connecting to external devices.

[0079] Continue to refer Figure 4 The viscosity sensor 22 includes a viscosity sensor rod 220, and the two ends of the viscosity sensor rod 220 are respectively provided with a viscosity sensor probe 221 and a viscosity sensor connector 222, and the viscosity sensor connector 222 is connected to the viscosity sensor probe 221 through a wire.

[0080] As a specific implementation, a double sensor groove is provided inside the upper ring portion 11 of the blowout preventer body 1, and the double sensor groove is communicated with the annular space 102, and the temperature and pressure integrated sensor 21 and the viscosity sensor 22 are jointly provided in the double sensor groove.

[0081] Preferably, the central channel 100 is a cylindrical through hole, and the integrated temperature and pressure sensor probe 211 and the viscosity sensor probe 221 are flush and tangent to the arc-shaped wall surface of the central channel 100 .

[0082] In order to fix the outer ends of the temperature-pressure integrated sensor 21 and the viscosity sensor 22, a specific implementation method is that a temperature-pressure viscosity flange 12 is configured on the side of the upper ring portion 11 of the blowout preventer body 1, and the temperature-pressure viscosity flange 12 is arranged at the outer end of the dual sensor groove, and the temperature-pressure viscosity flange 12 is fixed to the side of the upper ring portion 11 of the blowout preventer body 1 through a flange connection, and the outer ends of the fixed temperature-pressure integrated sensor 21 and the viscosity sensor 22 are connected to the temperature-pressure viscosity flange 12 to achieve the fixation of the outer ends of the temperature-pressure integrated sensor 21 and the viscosity sensor 22.

[0083] The temperature-pressure viscosity flange 12 is sealed and connected to the side surface of the upper ring portion 11 of the blowout preventer body 1 .

[0084] Specifically, the temperature-pressure viscosity flange 12 and the side surface of the lower ring portion 13 of the blowout preventer body 1 are fixed to the side surface of the upper ring portion 11 of the blowout preventer body 1 through high-pressure bolts, thereby realizing flange connection.

[0085] As a specific implementation method, continue to refer to Figure 4 A temperature-pressure integrated sensor flange 213 is provided at the end where the temperature-pressure integrated sensor connector 212 of the temperature-pressure integrated sensor 21 is located, the temperature-pressure integrated sensor connector 212 is configured on the temperature-pressure integrated sensor flange 213, and the temperature-pressure integrated sensor connector 212 can be detachably sleeved on the end of the temperature-pressure integrated sensor rod 210.

[0086] Further, as a specific implementation method for realizing the connection between the temperature-pressure integrated sensor 21 and the temperature-pressure viscosity flange 12, refer to Figure 6 and Figure 7 The inner side of the temperature and pressure viscosity flange 12 is provided with an eccentric flange 121, and the eccentric flange 121 is cylindrical;

[0087] The eccentric flange 121 is provided with a plurality of inner side flange holes 122 for connecting with the temperature-pressure integrated sensor flange 213 of the temperature-pressure integrated sensor 21 through a flange;

[0088] The center of the inner side flange hole 122 is provided with a temperature-pressure viscosity flange inner side connection hole 123 for inserting the temperature-pressure integrated sensor connector 212 when the inner side flange hole 122 is connected to the temperature-pressure integrated sensor flange 213 through a flange.

[0089] The outer side of the temperature-pressure viscosity flange 12 is provided with a temperature-pressure viscosity flange outer joint 124, and the temperature-pressure viscosity flange outer joint 124 is connected to the temperature-pressure viscosity flange inner connection hole 123 by wire;

[0090] When the temperature-pressure viscosity flange 12 is docked with the temperature-pressure integrated sensor 21, the temperature-pressure integrated sensor flange 213 is located on the inner side of the temperature-pressure viscosity flange 12, the inner side flange hole 122 of the temperature-pressure viscosity flange 12 is connected to the temperature-pressure integrated sensor flange 213 of the temperature-pressure integrated sensor 21 through a flange, and the temperature-pressure integrated sensor connector 212 is just inserted into the inner side connection hole 123 of the temperature-pressure viscosity flange.

[0091] Among them, the temperature and pressure viscosity flange outer joint 124 is used as a reserved joint for the temperature and pressure integrated sensor 21, such as Figure 3 As shown, the temperature and pressure viscosity flange outer joint 124 is used for connecting to external equipment.

[0092] Preferably, a sealing rubber ring is added between the temperature-pressure integrated sensor flange 213 and the temperature-pressure viscosity flange 12 to achieve sealing.

[0093] Continue to refer Figure 5 A viscosity sensor flange 223 is provided at the end of the viscosity sensor rod 220 where the viscosity sensor joint 222 is located. The viscosity sensor flange 223 is sleeved on the end of the viscosity sensor rod 220 , and the viscosity sensor joint 222 is detachably sleeved on the end of the viscosity sensor rod 220 .

[0094] Further, in order to pass through the viscosity sensor 22, continue to refer to Figure 6 and Figure 7 The eccentric flange 121 is also penetrated by a viscosity sensor rod through hole 125 for penetrating the viscosity sensor 22 .

[0095] Specifically, the viscosity sensor rod through hole 125 is located at the center of the temperature and pressure viscosity flange 12 and a plurality of inner side flange holes 122 are located at the eccentric position of the eccentric flange 121 .

[0096] The outer side surface of the temperature and pressure viscosity flange 12 is provided with an outer side surface flange hole 126 for being connected to the viscosity sensor flange 223 of the viscosity sensor 22 via a flange.

[0097] When the temperature-pressure viscosity flange 12 is docked with the viscosity sensor 22, the viscosity sensor flange 223 is located on the outside of the temperature-pressure viscosity flange 12, the flange hole 126 on the outer side of the temperature-pressure viscosity flange 12 is connected to the viscosity sensor flange 223 of the viscosity sensor 22 through a flange, and the viscosity sensor rod 220 of the viscosity sensor 22 just passes through the viscosity sensor rod through-hole 125 of the temperature-pressure viscosity flange 12, and the end of the viscosity sensor rod 220 is exposed, and the viscosity sensor joint 222 is sleeved on the end of the viscosity sensor rod 220.

[0098] The viscosity sensor connector 222 is a connector reserved for the viscosity sensor 22. Figure 3 As shown, the viscosity sensor connector 222 is used for connecting to external equipment.

[0099] Preferably, sealing is achieved between the viscosity sensor flange 223 and the temperature-pressure viscosity flange 12 by adding a sealing rubber ring.

[0100] Similarly, the ultrasonic Doppler sensor 23 and its connection relationship with the lower ring portion 13 of the BOP body 1 are described below.

[0101] First, each of the ultrasonic Doppler sensors 23 includes an ultrasonic Doppler sensor rod 230, and the two ends of the ultrasonic Doppler sensor rod 230 are respectively provided with an ultrasonic Doppler sensor probe 231 and an ultrasonic Doppler sensor connector 232, and the ultrasonic Doppler sensor probe 231 and the ultrasonic Doppler sensor connector 232 are connected by wires, such as Figure 8 shown.

[0102] Next, the connection relationship between the two groups of ultrasonic Doppler sensors 23 and the lower ring portion 13 of the BOP body 1 is introduced.

[0103] As a specific implementation method, continue to refer to Figure 3 A left ultrasonic Doppler sensor slot and a right ultrasonic Doppler sensor slot are symmetrically arranged on both sides of the lower ring portion 13 of the blowout preventer body 1 about the longitudinal center line of the central channel 100, and the inner ends of the left ultrasonic Doppler sensor slot and the right ultrasonic Doppler sensor slot are respectively communicated with the annular space 102, and a group of ultrasonic Doppler sensors 23 are respectively arranged in the left ultrasonic Doppler sensor slot and the right ultrasonic Doppler sensor slot, and the ultrasonic Doppler sensor probes 231 of the two groups of ultrasonic Doppler sensors 23 are close to one side of the central channel 100 and just touch the annular space 102 without penetrating.

[0104] Preferably, the central channel 100 is a cylindrical through hole, and the ultrasonic Doppler sensor probes 231 of the two groups of ultrasonic Doppler sensors 23 are tangent to the arc-shaped wall surface of the central channel 100 .

[0105] In order to fix the outer ends of the two sets of ultrasonic Doppler sensors 23, a specific implementation method is to refer to Figure 3 The outer ends of the left ultrasonic Doppler sensor slot and the right ultrasonic Doppler sensor slot are respectively provided with ultrasonic Doppler sensor flanges 14, and the outer ends of the two groups of ultrasonic Doppler sensors 23 are connected and fixed to the side of the lower ring portion 13 of the blowout preventer body 1 through flanges.

[0106] The ultrasonic Doppler sensor flange 14 is sealed and connected to the side surface of the lower ring portion 13 of the blowout preventer body 1 .

[0107] Specifically, the ultrasonic Doppler sensor flange 14 is fixed to the side of the lower ring portion 13 of the blowout preventer body 1 by high-pressure bolts, thereby realizing flange connection.

[0108] Continue to refer Figure 8 The outer end of the ultrasonic Doppler sensor rod 230 of each ultrasonic Doppler sensor 23 is provided with an ultrasonic Doppler sensor flange 233, and the ultrasonic Doppler sensor connector 232 is provided on the ultrasonic Doppler sensor flange 233, and the ultrasonic Doppler sensor flange 233 is detachably connected to the outer end of the ultrasonic Doppler sensor rod 230.

[0109] Continue to refer Fig. 9 and Fig.10 A second flange 141 is disposed on the inner side of the ultrasonic Doppler sensor flange 14 , and a second flange hole 142 is disposed on the second flange 141 for docking with the ultrasonic Doppler sensor flange 233 of the ultrasonic Doppler sensor 23 .

[0110] Further, in order to lead out the ultrasonic Doppler sensor connector 232 of the ultrasonic Doppler sensor 23, continue to refer to Fig. 9 and Fig.10 An ultrasonic Doppler sensor flange inner connection hole 143 is provided at the center of the second flange hole 142 for inserting an ultrasonic Doppler sensor connector 232 of the ultrasonic Doppler sensor 23 .

[0111] An ultrasonic Doppler sensor flange outer connector 144 is disposed at the center of the outer side surface of the ultrasonic Doppler sensor flange 14 , and the ultrasonic Doppler sensor flange inner connection hole 143 is connected to the ultrasonic Doppler sensor flange outer connector 144 via a wire.

[0112] When the ultrasonic Doppler sensor flange 14 is docked with the ultrasonic Doppler sensor 23, the ultrasonic Doppler sensor flange 233 is located on the inner side of the ultrasonic Doppler sensor flange 14, the second flange hole 142 of the ultrasonic Doppler sensor flange 14 is connected to the ultrasonic Doppler sensor flange 233 of the ultrasonic Doppler sensor 23 through a flange, and the ultrasonic Doppler sensor connector 232 of the ultrasonic Doppler sensor 23 is just inserted into the inner side connection hole 143 of the ultrasonic Doppler sensor flange.

[0113] The ultrasonic Doppler sensor flange outer connector 144 is used as a connector reserved for the ultrasonic Doppler sensor 23. Figure 3 As shown, the outer connector 144 of the ultrasonic Doppler sensor flange is used for connecting to external equipment.

[0114] Preferably, a sealing rubber ring is provided between the ultrasonic Doppler sensor flange 233 and the ultrasonic Doppler sensor flange 14 to achieve sealing.

[0115] Example 2: A deepwater blowout preventer capable of processing collected data

[0116] In order to process the temperature, pressure, viscosity and ultrasonic Doppler parameters of the drilling fluid in the blowout preventer collected by the deepwater blowout preventer for early warning of gas intrusion in Example 1, based on the deepwater blowout preventer for early warning of gas intrusion provided in Example 1, Example 2 improves the deepwater blowout preventer, and the improvement lies in that an underwater monitoring host and an above-water monitoring host are additionally provided.

[0117] The underwater monitoring host comprises an upper annular underwater monitoring host 31 , a lower annular underwater monitoring host 32 and an underwater electronic cabin 33 .

[0118] Continue to refer Figure 1 The upper annular underwater monitoring host 31 and the underwater electronic cabin 33 are arranged on the upper ring portion 11 of the blowout preventer body 1 , and the lower annular underwater monitoring host 32 is arranged on the lower ring portion 13 of the blowout preventer body 1 .

[0119] refer to Fig.11 The two ends of the upper annular underwater monitoring host 31 are respectively provided with a temperature-pressure viscosity input joint 310 and a temperature-pressure viscosity output joint 311. The interior of the upper annular underwater monitoring host 31 is provided with a viscosity sensor main board and a temperature-pressure sensor main board. The viscosity sensor main board is respectively connected to the temperature-pressure viscosity input joint 310 and the temperature-pressure viscosity output joint 311, and the temperature-pressure sensor main board is respectively connected to the temperature-pressure viscosity input joint 310 and the temperature-pressure viscosity output joint 311.

[0120] The temperature-pressure viscosity input connector 310 is connected to the temperature-pressure integrated sensor connector 212 of the temperature-pressure integrated sensor 21 and the viscosity sensor connector 222 of the viscosity sensor 22 respectively; the temperature-pressure viscosity output connector 311 is connected to the underwater electronic cabin 33, wherein the underwater electronic cabin 33 is used for data conversion.

[0121] refer to Fig.12 The two ends of the lower annular underwater monitoring host 32 are respectively provided with an ultrasonic Doppler parameter input connector 320 and an ultrasonic Doppler parameter output connector 321, and the interior of the lower annular underwater monitoring host 32 is provided with an ultrasonic Doppler sensor mainboard, and the ultrasonic Doppler sensor mainboard is respectively connected to the ultrasonic Doppler parameter input connector 320 and the ultrasonic Doppler parameter output connector 321.

[0122] The ultrasonic Doppler parameter input connector 320 is connected to the ultrasonic Doppler sensor flange outer connector 144 ; the ultrasonic Doppler parameter output connector 321 is connected to the underwater electronic cabin 33 .

[0123] The water monitoring host includes an industrial computer 34 and a wiring box 35 , as well as a power supply, cables, etc. The power supply and the cables of the industrial computer 34 are brought together through the wiring box 35 .

[0124] The underwater electronic cabin 33 is connected to the industrial computer 34 via a wiring box 35 .

[0125] In addition, the water monitoring host also includes an early warning device, which is connected to the industrial computer 34.

[0126] The industrial computer 34 collects the signals uploaded by the underwater monitoring host, and is responsible for parsing, storing and visualizing the data transmitted by the underwater monitoring host. It also analyzes the current gas content in combination with pressure, temperature, viscosity and ultrasonic Doppler data, and determines the degree of gas invasion in combination with historical data. It also predicts the time when the gas reaches the wellhead and completes the early warning of gas invasion. When it is determined that early gas invasion has occurred, the industrial computer 34 controls the early warning device to issue a gas invasion warning.

[0127] In order to increase the stability of the upper ring portion 11 and the lower ring portion 13 of the blowout preventer body 1, the upper ring portion 11 and the lower ring portion 13 of the blowout preventer body 1 are respectively provided with fixing bands 15 for fixing the upper annular underwater monitoring host 31 and the lower annular underwater monitoring host 32 of the underwater monitoring host respectively.

[0128] Example 3: A method for using a deepwater blowout preventer for early warning of gas intrusion

[0129] Embodiment 3 provides a method for using a deepwater blowout preventer for early warning of gas intrusion, using the deepwater blowout preventer of Embodiment 2, and the method comprises the following specific steps:

[0130] Step A: Inject drilling fluid into the annular space 102 .

[0131] Step B: The temperature and pressure integrated sensor 21 collects information about the temperature and pressure of the drilling fluid in the blowout preventer; the viscosity sensor 22 collects information about the viscosity of the drilling fluid in the blowout preventer; and the ultrasonic Doppler sensor 23 collects information about the frequency change of the drilling fluid in the blowout preventer.

[0132] Step C: The information of the temperature and pressure of the drilling fluid is transmitted to the temperature-pressure viscosity connector 310 through the temperature-pressure integrated sensor probe 211 of the temperature-pressure integrated sensor 21, and then transmitted to the temperature-pressure sensor mainboard. The temperature-pressure sensor mainboard converts the analog signal into a digital signal, and the digital signal is transmitted to the underwater electronic cabin 33 through the temperature-pressure viscosity output connector 311, and finally transmitted to the industrial computer 34 of the above-water monitoring host;

[0133] The information of the viscosity of the drilling fluid is transmitted to the viscosity sensor connector 222 through the viscosity sensor probe 221 of the viscosity sensor 22, and then transmitted to the viscosity sensor mainboard. The viscosity sensor mainboard converts the analog signal into a digital signal, and the digital signal is transmitted to the underwater electronic cabin 33 through the temperature and pressure viscosity output connector 311, and finally transmitted to the industrial computer 34 of the above-water monitoring host.

[0134] The information of the frequency change of the drilling fluid is transmitted to the ultrasonic Doppler sensor connector 232 through the ultrasonic Doppler sensor probe 231 of the ultrasonic Doppler sensor 23, and then transmitted to the ultrasonic Doppler sensor main board. The ultrasonic Doppler sensor main board converts the analog signal into a digital signal, and the digital signal is transmitted to the underwater electronic cabin 33 through the ultrasonic Doppler parameter output connector 321, and finally transmitted to the industrial computer 34 of the above-water monitoring host.

[0135] Step C: The industrial computer 34 of the above-water monitoring host displays digital signals such as the temperature and pressure, viscosity and frequency change of the drilling fluid in the blowout preventer.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A deepwater blowout preventer for early warning of gas intrusion, comprising a blowout preventer body (1), the blowout preventer body (1) comprising an upper ring portion (11), a middle portion and a lower ring portion (13), the upper ring portion (11) and the lower ring portion (13) of the blowout preventer body (1) being connected via the middle portion; a central channel (100) is arranged inside the blowout preventer body (1), the central channel (100) sequentially passing through the upper ring portion (11), the middle portion and the lower ring portion (13) of the blowout preventer body (1) from top to bottom; a drill pipe (101) is inserted into the central channel (100), an annular space (102) is formed between the drill pipe (101) and the inner wall of the central channel (100), It is characterized in that It also includes a set of integrated temperature and pressure sensors (21), a set of viscosity sensors (22) and two sets of ultrasonic Doppler sensors (23). The integrated temperature and pressure sensor (21) and the viscosity sensor (22) are arranged in parallel on one side of the interior of the upper ring portion (11) of the blowout preventer body (1), and the probes of the integrated temperature and pressure sensor (21) and the viscosity sensor (22) are close to one side of the central channel (100) and just touch the annular space (102) without penetrating into the annular space (102); Two groups of ultrasonic Doppler sensors (23) are respectively arranged on both sides of the lower ring portion (13) of the blowout preventer body (1), and the probe of each group of ultrasonic Doppler sensors (23) is close to one side of the central channel (100) and just touches but does not penetrate into the annular space (102); The temperature-pressure integrated sensor (21), the viscosity sensor (22) and the two groups of ultrasonic Doppler sensors (23) are all provided with connectors reserved on the side of the blowout preventer body (1), and the connectors of the temperature-pressure integrated sensor (21), the viscosity sensor (22) and the ultrasonic Doppler sensor (23) are respectively connected to their respective probes; Wherein, the annular space (102) is used for injecting drilling fluid; The integrated temperature and pressure sensor (21) is used to collect the temperature and pressure of the drilling fluid in the blowout preventer; The viscosity sensor (22) is used to collect the viscosity of the drilling fluid in the blowout preventer; The ultrasonic Doppler sensor (23) is used to collect frequency changes of the drilling fluid in the blowout preventer.

2. The deepwater blowout preventer for early warning of gas intrusion according to claim 1 is characterized in that: The temperature-pressure integrated sensor (21) comprises a temperature-pressure integrated sensor rod (210), and the two ends of the temperature-pressure integrated sensor rod (210) are respectively provided with a temperature-pressure integrated sensor probe (211) and a temperature-pressure integrated sensor connector (212), and the temperature-pressure integrated sensor connector (212) is connected to the temperature-pressure integrated sensor probe (211) via a wire; The viscosity sensor (22) comprises a viscosity sensor rod (220), and a viscosity sensor probe (221) and a viscosity sensor connector (222) are respectively provided at two ends of the viscosity sensor rod (220), and the viscosity sensor connector (222) is connected to the viscosity sensor probe (221) via a wire.

3. The deepwater blowout preventer for early warning of gas intrusion according to claim 2 is characterized in that: A double sensor groove is arranged inside the upper ring portion (11) of the blowout preventer body (1), and the double sensor groove is communicated with the annular space (102), and the temperature and pressure integrated sensor (21) and the viscosity sensor (22) are arranged together in the double sensor groove.

4. The deepwater blowout preventer for early warning of gas intrusion according to claim 3 is characterized in that: The central channel (100) is a cylindrical through hole, and the temperature-pressure integrated sensor probe (211) and the viscosity sensor probe (221) are flush with and tangent to the arc-shaped wall surface of the central channel (100).

5. The deepwater blowout preventer for early warning of gas intrusion according to claim 3 is characterized in that: A temperature-pressure viscosity flange (12) is disposed on the side of the upper ring portion (11) of the blowout preventer body (1). The temperature-pressure viscosity flange (12) is arranged at the outer end of the dual sensor groove, and the temperature-pressure viscosity flange (12) is fixed to the side of the upper ring portion (11) of the blowout preventer body (1) through flange connection. The outer ends of the constant temperature-pressure integrated sensor (21) and the viscosity sensor (22) are connected to the temperature-pressure viscosity flange (12), thereby fixing the outer ends of the temperature-pressure integrated sensor (21) and the viscosity sensor (22).

6. The deepwater blowout preventer for early warning of gas intrusion according to claim 5 is characterized in that: A temperature-pressure integrated sensor flange (213) is provided at the end of the temperature-pressure integrated sensor connector (212) of the temperature-pressure integrated sensor (21), the temperature-pressure integrated sensor connector (212) is arranged on the temperature-pressure integrated sensor flange (213), and the temperature-pressure integrated sensor connector (212) is detachably sleeved on the end of the temperature-pressure integrated sensor rod (210); The eccentric flange (121) is provided with a plurality of inner side flange holes (122), the center of the inner side flange hole (122) is provided with a temperature-pressure-viscosity flange inner side connection hole (123), the outer side of the temperature-pressure-viscosity flange (12) is provided with a temperature-pressure-viscosity flange outer side joint (124), and the temperature-pressure-viscosity flange outer side joint (124) is connected to the temperature-pressure-viscosity flange inner side connection hole (123) by wire; When the temperature-pressure viscosity flange (12) is docked with the temperature-pressure integrated sensor (21), the temperature-pressure integrated sensor flange (213) is located on the inner side of the temperature-pressure viscosity flange (12), the inner side flange hole (122) of the temperature-pressure viscosity flange (12) is connected to the temperature-pressure integrated sensor flange (213) of the temperature-pressure integrated sensor (21) through a flange, and the temperature-pressure integrated sensor connector (212) is just inserted into the inner side connection hole (123) of the temperature-pressure viscosity flange.

7. The deepwater blowout preventer for early warning of gas intrusion according to claim 5 is characterized in that: The end of the viscosity sensor rod (220) where the viscosity sensor joint (222) is located is provided with a viscosity sensor flange (223), the viscosity sensor flange (223) is sleeved on the end of the viscosity sensor rod (220), and the viscosity sensor joint (222) is detachably sleeved on the end of the viscosity sensor rod (220); The eccentric flange (121) is also provided with a viscosity sensor rod through-hole (125). The outer side surface of the temperature and pressure viscosity flange (12) is provided with an outer side flange hole (126), When the temperature-pressure viscosity flange (12) is butt-jointed with the viscosity sensor (22), the viscosity sensor flange (223) is located outside the temperature-pressure viscosity flange (12), the flange hole (126) on the outer side of the temperature-pressure viscosity flange (12) is connected to the viscosity sensor flange (223) of the viscosity sensor (22) through a flange, and the viscosity sensor rod (220) of the viscosity sensor (22) just passes through the viscosity sensor rod through-hole (125) of the temperature-pressure viscosity flange (12) and exposes the end of the viscosity sensor rod (220), and the viscosity sensor connector (222) is sleeved on the end of the viscosity sensor rod (220).

8. The deepwater blowout preventer for early warning of gas intrusion according to claim 1 is characterized in that: Each of the ultrasonic Doppler sensors (23) comprises an ultrasonic Doppler sensor rod (230), and an ultrasonic Doppler sensor probe (231) and an ultrasonic Doppler sensor connector (232) are respectively arranged at two ends of the ultrasonic Doppler sensor rod (230); the ultrasonic Doppler sensor probe (231) and the ultrasonic Doppler sensor connector (232) of the ultrasonic Doppler sensor (23) are connected via a wire.

9. The deepwater blowout preventer for early warning of gas intrusion according to claim 8, characterized in that: A left ultrasonic Doppler sensor slot and a right ultrasonic Doppler sensor slot are symmetrically arranged on both sides of the lower ring portion (13) of the blowout preventer body (1) about the longitudinal center line of the central channel (100), the inner ends of the left ultrasonic Doppler sensor slot and the right ultrasonic Doppler sensor slot are respectively communicated with the annular space (102), a group of ultrasonic Doppler sensors (23) are respectively arranged in the left ultrasonic Doppler sensor slot and the right ultrasonic Doppler sensor slot, and the ultrasonic Doppler sensor probes (231) of the two groups of ultrasonic Doppler sensors (23) are close to one side of the central channel (100) and just touch the annular space (102) without penetrating; The outer ends of the left ultrasonic Doppler sensor slot and the right ultrasonic Doppler sensor slot are respectively provided with ultrasonic Doppler sensor flanges (14), and the outer ends of the two groups of ultrasonic Doppler sensors (23) are connected and fixed to the side of the lower ring part (13) of the blowout preventer body (1) through the flanges.

10. The deepwater blowout preventer for early warning of gas intrusion according to claim 9, characterized in that: The outer end of the ultrasonic Doppler sensor rod (230) of each ultrasonic Doppler sensor (23) is provided with an ultrasonic Doppler sensor flange (233), the ultrasonic Doppler sensor connector (232) is provided on the ultrasonic Doppler sensor flange (233), and the ultrasonic Doppler sensor flange (233) is detachably connected to the outer end of the ultrasonic Doppler sensor rod (230); A second flange (141) is provided on the inner side of the ultrasonic Doppler sensor flange (14), and a second flange hole (142) is provided on the second flange (141) for docking with the ultrasonic Doppler sensor flange (233) of the ultrasonic Doppler sensor (23); The center of the second flange hole (142) is provided with an ultrasonic Doppler sensor flange inner side connection hole (143). An ultrasonic Doppler sensor flange outer connector (144) is provided at the center of the outer side surface of the ultrasonic Doppler sensor flange (14), and the ultrasonic Doppler sensor flange inner connection hole (143) is connected to the ultrasonic Doppler sensor flange outer connector (144) via a wire; When the ultrasonic Doppler sensor flange (14) is docked with the ultrasonic Doppler sensor (23), the ultrasonic Doppler sensor flange (233) is located on the inner side of the ultrasonic Doppler sensor flange (14), the second flange hole (142) of the ultrasonic Doppler sensor flange (14) is connected to the ultrasonic Doppler sensor flange (233) of the ultrasonic Doppler sensor (23) through a flange, and the ultrasonic Doppler sensor connector (232) of the ultrasonic Doppler sensor (23) is just inserted into the inner side connection hole (143) of the ultrasonic Doppler sensor flange.

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