Combustible gas monitoring system for wellheads under pressure

Abstract

The present invention belongs to the field of combustible gas monitoring and involves data analysis technology, which is used to solve the problem in the prior art that when abnormal concentration is monitored, safety risk analysis cannot be performed according to monitoring parameters of all areas. Specifically, it is a combustible gas monitoring system suitable for pressurized wellheads, including a gas monitoring module, a risk analysis module, a feature assessment module and a space assessment module, and the gas monitoring module, the risk analysis module, the feature assessment module and the space assessment module are communicatively connected in sequence; the gas monitoring module is used to monitor the combustible gas at the pressurized wellhead: obtain the combustible coefficient of the monitoring area within the monitoring period; the present invention can process the combustible coefficient of all monitoring areas and obtain gas performance values ​​and gas concentration values, so as to evaluate and analyze the overall combustible risk according to the gas performance values ​​and the gas concentration values, and perform multivariate analysis on the combustible risk of the pressurized wellhead.

Description

Technical Field

[0001] The invention belongs to the field of combustible gas monitoring and relates to data analysis technology, and in particular to a combustible gas monitoring system suitable for a wellhead under pressure operation. Background Art

[0002] Wellhead pressure operation is a technology that uses well control equipment to control wellhead pressure. It allows the dynamic sealing of the annular space of the oil casing and the prevention of pipe string blowout during the construction process to be solved through specific equipment and process flow without the need to kill the well.

[0003] The combustible gas monitoring system at the pressurized wellhead in the prior art is only capable of monitoring the combustible gas concentration. However, when abnormal concentration is detected, it is unable to perform safety risk analysis based on the monitoring parameters of all areas, and further, it is unable to generate corresponding treatment strategies based on the safety risk analysis results. As a result, the treatment measures for abnormal concentration are single and cannot take into account both construction progress and construction safety.

[0004] In view of the above technical problems, this application proposes a solution. Summary of the invention

[0005] The purpose of the present invention is to provide a combustible gas monitoring system suitable for a wellhead under pressure operation, which is used to solve the problem in the prior art that safety risk analysis cannot be performed based on monitoring parameters of all areas when abnormal concentration is detected;

[0006] The technical problem to be solved by the present invention is: how to provide a combustible gas monitoring system suitable for pressurized wellheads that can perform safety risk analysis based on monitoring parameters of all areas when abnormal concentrations are detected.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A combustible gas monitoring system applicable to a wellhead under pressure operation, comprising a gas monitoring module, a risk analysis module, a feature assessment module and a space assessment module, wherein the gas monitoring module, the risk analysis module, the feature assessment module and the space assessment module are sequentially connected in communication;

[0009] The gas monitoring module is used to monitor the combustible gas at the wellhead under pressure: the gas monitoring area at the wellhead under pressure is divided into several monitoring areas, a monitoring cycle is generated and the monitoring cycle is divided into several monitoring time periods, and the combustible coefficient KR of the monitoring area within the monitoring time period is obtained; the combustible coefficient KR of all monitoring areas is sent to the risk analysis module;

[0010] The risk analysis module is used to analyze the combustible risk of the pressurized operating wellhead and determine whether the combustible risk of the pressurized operating wellhead during the monitoring period meets the requirements;

[0011] The characteristic evaluation module is used to evaluate and analyze the risk characteristic distribution state of the pressurized wellhead and obtain the characteristic distribution coefficient of the monitoring period, and determine whether the risk characteristic distribution state of the pressurized wellhead during the monitoring period meets the requirements through the characteristic distribution coefficient;

[0012] The spatial evaluation module is used to evaluate and analyze the spatial distribution state of the wellhead under pressure operation.

[0013] Furthermore, the process of obtaining the flammability coefficient KR of the monitoring area during the monitoring period includes: setting a number of monitoring points in the monitoring area, setting detection terminals at the monitoring points, obtaining the hydrogen concentration value, methane concentration value, acetylene concentration value and ethylene concentration value of the monitoring points through the detection terminals, marking the maximum value of the hydrogen concentration value, the maximum value of the methane concentration value, the maximum value of the acetylene concentration value and the maximum value of the ethylene concentration value of all the monitoring points in the monitoring area as the hydrogen concentration data QN, the methane concentration data JN, the acetylene data YQ and the ethylene data YS of the monitoring area respectively; through the formula The flammability coefficient KR of the monitoring area during the monitoring period is obtained, where m1, m2, m3 and m4 are all proportional coefficients, and m1>m2>m3>m4>1.

[0014] Furthermore, the specific process of the risk analysis module for analyzing the flammable risk of a pressurized wellhead includes: summing and averaging the flammable coefficients KR of all monitoring areas within the monitoring period to obtain the gas performance value of the monitoring period, performing variance calculation on the flammable coefficients KR of all monitoring areas within the monitoring period to obtain the gas concentration value of the monitoring period, comparing the gas performance value and the gas concentration value of the monitoring period with the preset gas performance threshold and the gas concentration threshold respectively, and judging whether the flammable risk of the pressurized wellhead within the monitoring period meets the requirements through the comparison results.

[0015] Furthermore, the specific process of comparing the gas performance value and the gas concentration value of the monitoring period with the preset gas performance threshold and the gas concentration threshold respectively includes: if the gas performance value is less than the gas performance threshold and the gas concentration value is less than the gas concentration threshold, it is determined that the flammable risk of the pressurized operation wellhead during the monitoring period meets the requirements; if the gas concentration value is greater than or equal to the gas concentration threshold, it is determined that the flammable risk of the pressurized operation wellhead during the monitoring period does not meet the requirements, an evaluation and analysis signal is generated and sent to the feature evaluation module; if the gas performance value is greater than or equal to the gas performance threshold and the gas concentration value is less than the gas concentration threshold, it is determined that the flammable risk of the pressurized operation wellhead during the monitoring period does not meet the requirements, an evacuation warning signal is generated and the evacuation warning signal is sent to the mobile phone terminal of the manager.

[0016] Furthermore, the process of obtaining the characteristic distribution coefficient of the monitoring period includes: obtaining the air temperature value and air flow rate value of the monitoring point through the detection terminal, marking the maximum value of the air temperature value and the maximum value of the air flow rate of all monitoring points in the monitoring area as the high temperature value WG and the high speed value SG respectively; The shadow coefficient HY of the monitoring area during the monitoring period is obtained, where k1 and k2 are both proportional coefficients, and k1>k2>1; all monitoring areas are arranged in descending order according to the flammable coefficient KR values ​​to obtain a flammable sequence, and all monitoring areas are arranged in descending order according to the shadow coefficient HY values ​​to obtain a shadow sequence, and the absolute value of the difference between the sequence number of the monitoring area in the flammable sequence and the sequence number in the shadow sequence is marked as the characteristic distribution value of the monitoring area, and the characteristic distribution values ​​of all monitoring areas are summed and averaged to obtain the characteristic distribution coefficient of the monitoring period.

[0017] Furthermore, the specific process of determining whether the risk characteristic distribution state of the pressurized operating wellhead during the monitoring period meets the requirements includes: retrieving the characteristic distribution threshold through the database, and comparing the characteristic distribution coefficient of the monitoring period with the characteristic distribution threshold: if the characteristic distribution coefficient is less than the characteristic distribution threshold, it is determined that the risk characteristic distribution state of the pressurized operating wellhead during the monitoring period does not meet the requirements, an evacuation warning signal is generated and the evacuation warning signal is sent to the mobile phone terminal of the manager; if the characteristic distribution coefficient is greater than or equal to the characteristic distribution threshold, it is determined that the risk characteristic distribution state of the pressurized operating wellhead during the monitoring period meets the requirements, a spatial distribution signal is generated and the spatial distribution signal is sent to the spatial evaluation module.

[0018] Furthermore, the specific process of the spatial assessment module evaluating and analyzing the spatial distribution status of the pressurized wellhead includes: intercepting the top L1 monitoring areas in the combustible sequence and marking them as combustible protruding areas, intercepting the top L1 monitoring areas in the ring shadow sequence and marking them as ring shadow protruding areas, and determining whether there are monitoring areas that are marked as both combustible protruding areas and ring shadow protruding areas: if so, an evacuation warning signal is generated and the evacuation warning signal is sent to the mobile phone terminal of the manager; if not, the spatial distribution value of the pressurized wellhead is obtained, the spatial distribution threshold is retrieved through the database, and the spatial distribution value of the pressurized wellhead is compared with the spatial distribution threshold: if the spatial distribution value is less than the spatial distribution threshold, an evacuation warning signal is generated and the evacuation warning signal is sent to the mobile phone terminal of the manager; if the spatial distribution value is greater than or equal to the spatial distribution threshold, a risk control signal is generated and the risk control signal is sent to the mobile phone terminal of the manager.

[0019] Furthermore, the process of obtaining the spatial distribution value of the pressurized operating wellhead includes: marking the distance value between the center point of the combustible protruding area and the center point of the annular shadow protruding area as the straight distance value of the combustible protruding area, marking the minimum value of the straight distance value of the combustible protruding area relative to all annular shadow protruding areas as the spatial monitoring value, and marking the minimum value of the spatial monitoring values ​​of all combustible protruding areas as the spatial distribution value of the pressurized operating wellhead.

[0020] The present invention has the following beneficial effects:

[0021] 1. The gas monitoring module can monitor and analyze the combustible gas at the wellhead under pressure. The multi-point monitoring method is adopted to obtain multiple combustible gas concentration parameters of all monitoring points in the monitoring area and perform numerical calculations to obtain the combustible coefficient, so as to provide feedback on the overall concentration state of the combustible gas in the monitoring area through the combustible coefficient;

[0022] 2. The risk analysis module can be used to analyze the flammable risk of wellheads under pressure operation. After processing the flammable coefficients of all monitoring areas, the gas performance value and gas concentration value are obtained. Based on the gas performance value and gas concentration value, the overall flammable risk is evaluated and analyzed. When there is no obvious flammable risk, the risk feature analysis is triggered, and the flammable risk of wellheads under pressure operation is analyzed in multiple dimensions.

[0023] 3. The risk characteristic distribution status of the wellhead under pressure operation can be evaluated and analyzed through the characteristic evaluation module. The monitoring area can be sorted according to different rules to obtain the ring shadow sequence and the combustible sequence. The ring shadow sequence and the combustible sequence are compared to obtain the characteristic distribution coefficient. The overlap degree of the dangerous area of ​​the wellhead under pressure operation can be fed back through the characteristic distribution coefficient, so as to give timely warning when the risk characteristic distribution status does not meet the requirements;

[0024] 4. The spatial evaluation module can be used to evaluate and analyze the spatial distribution status of the pressurized wellhead. On the basis of qualified risk characteristic analysis results, the distance between the combustible protrusion area and the annular shadow protrusion area in the physical space is analyzed to obtain the spatial distribution value, and the final processing decision is screened and analyzed through the spatial distribution value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A system block diagram of the present invention as a whole;

[0027] Figure 2 is a system block diagram of Embodiment 1 of the present invention;

[0028] Figure 3 This is a system block diagram of Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, a combustible gas monitoring system suitable for pressurized wellheads includes a monitoring subsystem, an evaluation subsystem and a database. The monitoring subsystem and the evaluation subsystem are both connected to the database for communication. The monitoring subsystem includes a gas monitoring module and a risk analysis module; the evaluation subsystem includes a feature evaluation module and a space evaluation module.

[0031] Embodiment 1: Figure 2 As shown, the gas monitoring module, the risk analysis module and the feature evaluation module are sequentially connected for communication. The gas monitoring module is used to monitor the combustible gas at the wellhead under pressure: the gas monitoring area at the wellhead under pressure is divided into several monitoring areas, several monitoring points are set in the monitoring areas, and detection terminals are set at the monitoring points. The detection terminals include a hydrogen gas detector (a safety instrument for real-time detection of the on-site concentration of hydrogen. According to the duality of hydrogen, it can detect both its flammability and toxicity), a methane gas detector (a detection device that can continuously detect the concentration of methane gas), an acetylene detector (an acetylene concentration detection instrument widely used in gas, petroleum, chemical and other industries), an ethylene detector (a detection instrument that can be used to detect the concentration of ethylene in the petroleum and chemical fields in real time), a temperature sensor (a sensor that can sense temperature and convert it into a usable output signal) and a wind speed sensor (a device used to measure wind speed, Generally, a mechanical wind speed sensor is used), and the hydrogen concentration value, methane concentration value, acetylene concentration value and ethylene concentration value of the monitoring point are obtained through the detection terminal, and a monitoring cycle is generated and divided into several monitoring periods. The maximum value of the hydrogen concentration value, the maximum value of the methane concentration value, the maximum value of the acetylene concentration value and the maximum value of the ethylene concentration value of all monitoring points in the monitoring area are marked as the hydrogen concentration data QN, the methane concentration data JN, the acetylene data YQ and the ethylene data YS of the monitoring area respectively; through the formula The flammable coefficient KR of the monitoring area during the monitoring period is obtained, where m1, m2, m3 and m4 are all proportional coefficients, and m1>m2>m3>m4>1; the flammable coefficient KR of all monitoring areas is sent to the risk analysis module; the combustible gas at the wellhead under pressure is monitored and analyzed, and a multi-point monitoring method is adopted to obtain multiple combustible gas concentration parameters of all monitoring points in the monitoring area and perform numerical calculations to obtain the flammable coefficient, so as to provide feedback on the overall concentration state of the combustible gas in the monitoring area through the flammable coefficient.

[0032] The risk analysis module is used to analyze the flammable risk of the wellhead under pressure operation: the flammable coefficient KR of all monitoring areas within the monitoring period is summed and averaged to obtain the gas performance value of the monitoring period, the variance of the flammable coefficient KR of all monitoring areas within the monitoring period is calculated to obtain the gas concentration value of the monitoring period, the gas performance threshold and the gas concentration threshold are retrieved from the database, and the gas performance value and the gas concentration value of the monitoring period are compared with the gas performance threshold and the gas concentration threshold respectively: if the gas performance value is less than the gas performance threshold and the gas concentration value is less than the gas concentration threshold, it is determined that the flammable risk of the wellhead under pressure operation within the monitoring period meets the requirements; if the gas concentration value is greater than or equal to the gas concentration threshold, it is determined If the flammable risk of the pressurized wellhead does not meet the requirements during the monitoring period, an evaluation and analysis signal is generated and sent to the feature evaluation module; if the gas performance value is greater than or equal to the gas performance threshold and the gas concentration value is less than the gas concentration threshold, it is determined that the flammable risk of the pressurized wellhead does not meet the requirements during the monitoring period, an evacuation warning signal is generated and sent to the mobile phone terminal of the manager; after processing the flammable coefficients of all monitoring areas, the gas performance value and the gas concentration value are obtained, and the overall flammable risk is evaluated and analyzed based on the gas performance value and the gas concentration value, and when there is no obvious flammable risk, the risk feature analysis is triggered, and the flammable risk of the pressurized wellhead is analyzed multivariately.

[0033] Embodiment 2: Figure 3 As shown, the feature evaluation module is connected to the space evaluation module in communication. The feature evaluation module is used to evaluate and analyze the risk feature distribution state of the wellhead under pressure operation: the air temperature value and air velocity value of the monitoring point are obtained through the detection terminal, and the maximum value of the air temperature value and the maximum value of the air velocity value of all the monitoring points in the monitoring area are marked as the temperature high value WG and the velocity high value SG respectively; through the formula The shadow coefficient HY of the monitoring area in the monitoring period is obtained, where k1 and k2 are both proportional coefficients, and k1>k2>1; all monitoring areas are arranged in descending order according to the combustible coefficient KR values ​​to obtain a combustible sequence, and all monitoring areas are arranged in descending order according to the shadow coefficient HY values ​​to obtain a shadow sequence, and the absolute value of the difference between the sequence number of the monitoring area in the combustible sequence and the sequence number in the shadow sequence is marked as the characteristic distribution value of the monitoring area, and the characteristic distribution values ​​of all monitoring areas are summed and averaged to obtain the characteristic distribution coefficient of the monitoring period, and the characteristic distribution threshold is retrieved through the database, and the characteristic distribution coefficient of the monitoring period is compared with the characteristic distribution threshold: if the characteristic distribution coefficient is less than the characteristic distribution threshold, it is determined that the pressure operation If the risk characteristic distribution state of the operating wellhead during the monitoring period does not meet the requirements, an evacuation warning signal is generated and sent to the mobile phone terminal of the manager; if the characteristic distribution coefficient is greater than or equal to the characteristic distribution threshold, it is determined that the risk characteristic distribution state of the pressurized operating wellhead during the monitoring period meets the requirements, a spatial distribution signal is generated and sent to the spatial evaluation module; the risk characteristic distribution state of the pressurized operating wellhead is evaluated and analyzed, the monitoring area is sorted according to different rules to obtain the annular shadow sequence and the combustible sequence, the annular shadow sequence is compared with the combustible sequence to obtain the characteristic distribution coefficient, and the overlap degree of the dangerous area of ​​the pressurized operating wellhead is fed back through the characteristic distribution coefficient, so as to give a timely warning when the risk characteristic distribution state does not meet the requirements.

[0034] The spatial evaluation module is used to evaluate and analyze the spatial distribution status of the wellhead under pressure operation: intercept the top L1 monitoring areas in the combustible sequence and mark them as combustible protrusion areas, L1 is a numerical constant, and the specific value of L1 is set by the management personnel; intercept the top L1 monitoring areas in the ring shadow sequence and mark them as ring shadow protrusion areas, and determine whether there are monitoring areas marked as combustible protrusion areas and ring shadow protrusion areas at the same time: if so, generate an evacuation warning signal and send it to the mobile phone terminal of the management personnel; if not, mark the distance value between the center point of the combustible protrusion area and the center point of the ring shadow protrusion area as the straight distance value of the combustible protrusion area, mark the minimum value of the straight distance value of the combustible protrusion area relative to all ring shadow protrusion areas as the spatial monitoring value, and The minimum value of the spatial monitoring value of the combustible protruding area is marked as the spatial distribution value of the pressurized wellhead. The spatial distribution threshold is retrieved through the database, and the spatial distribution value of the pressurized wellhead is compared with the spatial distribution threshold: if the spatial distribution value is less than the spatial distribution threshold, an evacuation warning signal is generated and sent to the manager's mobile phone terminal; if the spatial distribution value is greater than or equal to the spatial distribution threshold, a risk control signal is generated and sent to the manager's mobile phone terminal; the spatial distribution status of the pressurized wellhead is evaluated and analyzed, and on the basis of qualified risk characteristic analysis results, the distance between the combustible protruding area and the shadow protruding area in physical space is analyzed to obtain the spatial distribution value, and the final processing decision is screened and analyzed through the spatial distribution value.

[0035] The combustible gas monitoring system is suitable for pressurized wellheads. When working, the gas monitoring area of ​​the pressurized wellhead is divided into several monitoring areas, a monitoring cycle is generated and the monitoring cycle is divided into several monitoring time periods, the combustible coefficient KR of the monitoring area within the monitoring time period is obtained, the combustible coefficient KR of all monitoring areas within the monitoring time period is summed and averaged to obtain the gas performance value of the monitoring time period, the variance of the combustible coefficient KR of all monitoring areas within the monitoring time period is calculated to obtain the gas concentration value of the monitoring time period, the combustible risk of the pressurized wellhead is evaluated through the gas performance value and the gas concentration value, and the risk characteristic analysis and spatial distribution status analysis are performed when the combustible risk does not meet the requirements.

[0036] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0037] The above formulas are obtained by collecting a large amount of data and performing software simulation to select a formula close to the actual value. The coefficients in the formula are set by technicians in this field according to actual conditions; for example: Formula ; A technician in this field collects multiple groups of sample data and sets a corresponding flammability coefficient for each group of sample data; Substitute the set flammability coefficient and the collected sample data into the formula, any four formulas constitute a four-variable linear equation system, screen the calculated coefficients and take the average, and obtain the values ​​of m1, m2, m3 and m4 as 3.85, 3.27, 2.92 and 2.65 respectively;

[0038] The size of the coefficient is to quantify each parameter to obtain a specific value for subsequent comparison. The size of the coefficient depends on the amount of sample data and the preliminary setting of the corresponding flammability coefficient for each set of sample data by technical personnel in this field; as long as it does not affect the proportional relationship between the parameter and the quantified value, such as the flammability coefficient is proportional to the value of the hydrogen concentration data.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0040] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A combustible gas monitoring system suitable for wellheads with pressure, characterized in that: It includes a gas monitoring module, a risk analysis module, a feature assessment module and a space assessment module, wherein the gas monitoring module, the risk analysis module, the feature assessment module and the space assessment module are sequentially connected in communication; The gas monitoring module is used to monitor the combustible gas at the wellhead under pressure: the gas monitoring area at the wellhead under pressure is divided into several monitoring areas, a monitoring cycle is generated and the monitoring cycle is divided into several monitoring time periods, and the combustible coefficient KR of the monitoring area within the monitoring time period is obtained; the combustible coefficient KR of all monitoring areas is sent to the risk analysis module; The risk analysis module is used to analyze the combustible risk of the pressurized operating wellhead and determine whether the combustible risk of the pressurized operating wellhead during the monitoring period meets the requirements; The characteristic evaluation module is used to evaluate and analyze the risk characteristic distribution state of the pressurized wellhead and obtain the characteristic distribution coefficient of the monitoring period, and determine whether the risk characteristic distribution state of the pressurized wellhead during the monitoring period meets the requirements through the characteristic distribution coefficient; The spatial evaluation module is used to evaluate and analyze the spatial distribution state of the wellhead under pressure operation; The process of obtaining the flammability coefficient KR of the monitoring area during the monitoring period includes: setting a number of monitoring points in the monitoring area, setting detection terminals at the monitoring points, obtaining the hydrogen concentration value, methane concentration value, acetylene concentration value and ethylene concentration value of the monitoring points through the detection terminals, marking the maximum value of the hydrogen concentration value, the maximum value of the methane concentration value, the maximum value of the acetylene concentration value and the maximum value of the ethylene concentration value of all the monitoring points in the monitoring area as the hydrogen concentration data QN, the methane concentration data JN, the acetylene data YQ and the ethylene data YS of the monitoring area respectively; obtaining the flammability coefficient KR of the monitoring area during the monitoring period through the formula KR=m1×QN+m2×JN+m3×YQ+m4×YS, wherein m1, m2, m3 and m4 are all proportional coefficients, and m1>m2>m3>m4>1; The specific process of the risk analysis module for analyzing the flammable risk of the wellhead under pressure operation includes: summing and averaging the flammable coefficients KR of all monitoring areas within the monitoring period to obtain the gas performance value of the monitoring period, performing variance calculation on the flammable coefficients KR of all monitoring areas within the monitoring period to obtain the gas concentration value of the monitoring period, comparing the gas performance value and gas concentration value of the monitoring period with the preset gas performance threshold and gas concentration threshold respectively, and judging whether the flammable risk of the wellhead under pressure operation within the monitoring period meets the requirements through the comparison results; The specific process of determining whether the risk characteristic distribution state of the pressurized wellhead during the monitoring period meets the requirements includes: retrieving the characteristic distribution threshold through the database, and comparing the characteristic distribution coefficient of the monitoring period with the characteristic distribution threshold: if the characteristic distribution coefficient is less than the characteristic distribution threshold, it is determined that the risk characteristic distribution state of the pressurized wellhead during the monitoring period does not meet the requirements, and an evacuation warning signal is generated and sent to the mobile phone terminal of the manager; if the characteristic distribution coefficient is greater than or equal to the characteristic distribution threshold, it is determined that the risk characteristic distribution state of the pressurized wellhead during the monitoring period meets the requirements, and a spatial distribution signal is generated and sent to the spatial evaluation module; The specific process of the spatial assessment module evaluating and analyzing the spatial distribution status of the pressurized wellhead includes: intercepting the top L1 monitoring areas in the combustible sequence and marking them as combustible protruding areas, intercepting the top L1 monitoring areas in the ring shadow sequence and marking them as ring shadow protruding areas, and determining whether there are monitoring areas that are marked as both combustible protruding areas and ring shadow protruding areas: if so, an evacuation warning signal is generated and sent to the mobile phone terminal of the manager; if not, the spatial distribution value of the pressurized wellhead is obtained, the spatial distribution threshold is retrieved through the database, and the spatial distribution value of the pressurized wellhead is compared with the spatial distribution threshold: if the spatial distribution value is less than the spatial distribution threshold, an evacuation warning signal is generated and sent to the mobile phone terminal of the manager; if the spatial distribution value is greater than or equal to the spatial distribution threshold, a risk control signal is generated and sent to the mobile phone terminal of the manager.

2. The combustible gas monitoring system suitable for a wellhead under pressure operation according to claim 1 is characterized in that: The specific process of comparing the gas performance value and the gas concentration value of the monitoring period with the preset gas performance threshold and the gas concentration threshold respectively includes: if the gas performance value is less than the gas performance threshold and the gas concentration value is less than the gas concentration threshold, it is determined that the flammable risk of the pressurized operation wellhead during the monitoring period meets the requirements; if the gas concentration value is greater than or equal to the gas concentration threshold, it is determined that the flammable risk of the pressurized operation wellhead during the monitoring period does not meet the requirements, an evaluation and analysis signal is generated and sent to the feature evaluation module; if the gas performance value is greater than or equal to the gas performance threshold and the gas concentration value is less than the gas concentration threshold, it is determined that the flammable risk of the pressurized operation wellhead during the monitoring period does not meet the requirements, an evacuation warning signal is generated and the evacuation warning signal is sent to the mobile phone terminal of the management personnel.

3. The combustible gas monitoring system suitable for a wellhead under pressure operation according to claim 2 is characterized in that: The process of obtaining the characteristic distribution coefficient of the monitoring period includes: obtaining the air temperature value and the air flow rate value of the monitoring point through the detection terminal, and marking the maximum value of the air temperature value and the maximum value of the air flow rate of all monitoring points in the monitoring area as the temperature height value WG and the speed height value SG respectively; obtaining the shadow coefficient HY of the monitoring area during the monitoring period through the formula, wherein k1 and k2 are both proportional coefficients, and k1>k2>1; arranging all monitoring areas in the order of the flammable coefficient KR values ​​from large to small to obtain a flammable sequence, arranging all monitoring areas in the order of the shadow coefficient HY values ​​from large to small to obtain a shadow sequence, marking the absolute value of the difference between the sequence number of the monitoring area in the flammable sequence and the sequence number in the shadow sequence as the characteristic distribution value of the monitoring area, and summing and averaging the characteristic distribution values ​​of all monitoring areas to obtain the characteristic distribution coefficient of the monitoring period.

4. The combustible gas monitoring system suitable for a wellhead under pressure operation according to claim 3 is characterized in that: The process of obtaining the spatial distribution value of the pressurized operating wellhead includes: marking the distance value between the center point of the combustible protruding area and the center point of the annular shadow protruding area as the straight distance value of the combustible protruding area, marking the minimum value of the straight distance value of the combustible protruding area relative to all the annular shadow protruding areas as the spatial monitoring value, and marking the minimum value of the spatial monitoring values ​​of all the combustible protruding areas as the spatial distribution value of the pressurized operating wellhead.

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