Method, system, medium and terminal for diagnosing operating state of underwater pressure increasing device

Abstract

The present application belongs to the technical field of oil and gas field development, and particularly relates to a method and system for diagnosing the operating state of underwater booster equipment, a medium and a terminal. The diagnosis method comprises: periodically collecting production data of the underwater gathering system in groups according to a preset time interval, calculating the inlet flow and outlet flow of the underwater booster equipment corresponding to each group of production data based on the obtained multiple groups of production data, and further obtaining the actual operating efficiency and the corresponding theoretical operating efficiency of the corresponding underwater booster equipment, and the relative deviation between the actual operating efficiency and the theoretical operating efficiency; obtaining the average value of the relative deviation and the number of groups whose relative deviation exceeds the preset acceptance threshold based on the relative deviation between the actual operating efficiency and the theoretical operating efficiency of the underwater booster equipment corresponding to all the production data, so as to evaluate the operating state of the underwater booster equipment. The present application periodically evaluates the operating state of the underwater booster equipment by using instrument data, and can provide the necessary conditions for the operation and maintenance of the underwater booster equipment.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field development technology, and in particular to a method, system, medium and terminal for diagnosing the operating status of underwater booster equipment. Background Technology

[0002] In offshore oil and gas field development projects, using subsea booster equipment to increase pipeline transmission pressure is one of the important means to increase offshore oil and gas production. Boosting capacity and boosting efficiency are two key indicators of the operational status of subsea booster equipment. After long-term operation following commissioning, the boosting capacity and efficiency of subsea booster equipment will slowly decline due to factors such as fluid erosion and equipment aging. For deep-water subsea pipelines with large drops in elevation, unstable flow conditions such as slug flows will accelerate the decline in the boosting capacity and efficiency of subsea booster equipment. When the operational status of subsea booster equipment declines to a certain extent, offshore oil and gas operators need to maintain the subsea booster equipment to ensure that it remains in optimal condition during operation and to extend its service life.

[0003] Previously, the diagnosis of the operational status of subsea booster equipment relied on the experience of on-site operators, often resulting in untimely equipment diagnosis and, in severe cases, even equipment shutdown, impacting safe oil and gas development. How to achieve intelligent diagnosis of the operational status of subsea booster equipment is a pressing production challenge that needs to be addressed in offshore oil and gas development sites.

[0004] Therefore, there is an urgent need for a diagnostic method for the operating status of underwater booster equipment to achieve intelligent diagnosis of the equipment's operating status and provide support for ensuring the safe and efficient development of offshore oil and gas. Summary of the Invention

[0005] The purpose of this invention is to provide a method, system, medium, and terminal for diagnosing the operational status of underwater booster equipment. By periodically collecting production data from the underwater gathering and transportation system at preset time intervals, the average relative deviation of all groups and the number of groups whose relative deviation exceeds a preset acceptance threshold are calculated. This ultimately determines the operational status of the underwater booster equipment, enabling periodic assessment of its operational status. This effectively solves the problem of untimely equipment diagnosis and provides a basis for on-site operation and maintenance decisions, ensuring the safe and stable operation of offshore oil and gas development.

[0006] To achieve the above objectives, in a first aspect, the technical solution adopted by the present invention is as follows: a method for diagnosing the operating status of an underwater booster device, comprising: periodically collecting production data from an underwater gathering and transportation system in sets according to a preset time interval to obtain multiple sets of production data; wherein each set of production data includes at least the inlet pressure, inlet temperature, outlet pressure, and outlet temperature of the underwater booster device, the volumetric flow rate of the fluid at the outlet of the slug catcher under standard conditions, and the output voltage and output current of the frequency converter; calculating the inlet fluid volumetric flow rate and outlet fluid volumetric flow rate of the underwater booster device corresponding to each set of production data based on the inlet pressure, inlet temperature, outlet pressure, and outlet temperature of the underwater booster device and the volumetric flow rate of the fluid at the outlet of the slug catcher under standard conditions in each set of production data; and calculating the volumetric flow rate of the underwater booster device corresponding to each set of production data based on the calculated volumetric flow rate of the underwater booster device in each set of production data; and calculating the volumetric flow rate of the underwater booster device in each set of production data in each set of production data in the first aspect. Using the inlet and outlet fluid volumetric flow rates of the underwater booster equipment corresponding to the production data set, as well as the output voltage and output current of the frequency converter, the actual operating efficiency and theoretical operating efficiency of the underwater booster equipment corresponding to that set of production data are calculated respectively. Furthermore, the relative deviation between the actual operating efficiency and the theoretical operating efficiency of the underwater booster equipment corresponding to each set of production data is calculated. Based on the relative deviations between the actual and theoretical operating efficiencies of the underwater booster equipment corresponding to all production data sets, the average value of all relative deviations and the number of sets where the relative deviation exceeds a preset acceptance threshold are calculated. Based on the average value of the relative deviations and the number of sets exceeding the preset acceptance threshold, the operating status of the underwater booster equipment is determined.

[0007] Furthermore, calculate the inlet or outlet fluid volumetric flow rate of the underwater pressurization equipment, including: Calculate the mole fraction of natural gas in the inlet fluid of the underwater pressurization equipment based on the inlet or outlet pressure, inlet or outlet temperature, and relative density of natural gas in the inlet fluid of the underwater pressurization equipment. The dissolved gas-oil ratio is calculated based on the mole fraction of natural gas, the relative density of crude oil in the inlet fluid of the underwater booster equipment, and the relative molecular weight of crude oil. The flow conversion coefficient is calculated based on the dissolved gas-oil ratio and the relative density of natural gas and crude oil in the inlet fluid of the underwater booster equipment. The inlet or outlet fluid volumetric flow rate of the underwater booster is calculated by multiplying the standard volumetric flow rate by the flow conversion coefficient corresponding to the inlet or outlet conditions of the underwater booster.

[0008] Furthermore, the inlet fluid volumetric flow rate or the outlet fluid volumetric flow rate is:

[0009]

[0010] In the formula, This refers to the inlet or outlet fluid volumetric flow rate, in cubic meters per second (m³). 3 / s; Volumetric flow rate under standard conditions, in cubic meters (m³). 3 / s; The flow conversion coefficient is dimensionless. The dissolved gas-oil ratio is dimensionless. The relative density of natural gas in the inlet fluid of the booster equipment is dimensionless. The relative density of crude oil in the inlet fluid of the booster equipment is dimensionless. The inlet fluid temperature of the booster equipment is ℃.

[0011] Furthermore, the actual operating efficiency of the underwater pressurization equipment is calculated, including: Calculate the voltage drop of the cable between the inverter and the motor based on the inverter's output current, and combine this with the inverter's output voltage to obtain the motor's input voltage and input current; The input power of the motor is calculated based on the input voltage and input current of the motor, and the input power of the underwater booster device is calculated by combining the motor efficiency. Calculate the output power of the underwater booster based on the inlet and outlet flow rates and the pressure difference between the inlet and outlet. The ratio of the output power to the input power is calculated to obtain the actual operating efficiency of the underwater booster equipment.

[0012] Furthermore, the input power of the underwater pressurization device is:

[0013] The output power of the underwater booster device is:

[0014] In the formula, Input power for underwater booster equipment, in watts (W). is the input power of the motor, in watts (W); ed is the motor efficiency, dimensionless. The output power of the underwater booster equipment, measured in watts (W). The inlet flow rate of the underwater booster equipment, in cubic meters (m³). 3 / s; The outlet flow rate of the underwater booster equipment, in cubic meters (m³). 3 / s; The pressure at the inlet of the booster equipment is expressed in Pa. The pressure is the outlet pressure of the booster equipment, expressed in Pa.

[0015] Furthermore, the theoretical operating efficiency of the underwater booster equipment is calculated by using a quadratic polynomial fitting based on the inlet flow rate of the underwater booster equipment and the inherent efficiency coefficient.

[0016] Furthermore, determining the operating status of the underwater pressurization equipment specifically involves: The average value of the relative deviation and the number of groups exceeding the preset acceptance threshold are compared with the corresponding preset thresholds. If the average relative deviation is greater than a preset average threshold or the number of groups exceeding a preset acceptance threshold is greater than a preset number of groups threshold, an abnormal operation signal for the underwater booster equipment is output; otherwise, a normal operation signal for the underwater booster equipment is output.

[0017] Secondly, the technical solution adopted by the present invention is: an underwater pressurization equipment operation status diagnosis system, which includes: The data acquisition module is used to periodically collect production data from the underwater gathering and transportation system at preset time intervals to obtain multiple sets of production data; wherein each set of production data includes at least the inlet pressure, inlet temperature, outlet pressure, outlet temperature of the underwater booster equipment, the volumetric flow rate of the fluid at the outlet of the slug catcher under standard conditions, and the output voltage and output current of the frequency converter. The flow calculation module is used to calculate the inlet fluid volumetric flow rate and outlet fluid volumetric flow rate of the underwater booster equipment corresponding to each set of production data, based on the inlet pressure, inlet temperature, outlet pressure, outlet temperature and the standard volumetric flow rate of the fluid at the outlet of the slug catcher in each set of production data. The efficiency calculation module is used to calculate the actual operating efficiency and the corresponding theoretical operating efficiency of the underwater booster equipment corresponding to each set of production data based on the inlet fluid volume flow rate and outlet fluid volume flow rate of the underwater booster equipment corresponding to each set of production data, as well as the output voltage and output current of the frequency converter. The relative deviation calculation module calculates the relative deviation between the actual operating efficiency and the theoretical operating efficiency of the underwater booster equipment corresponding to each set of production data; The judgment condition determination module calculates the average value of all relative deviations and the number of groups where the relative deviation exceeds a preset acceptance threshold, based on the relative deviation between the actual operating efficiency and the theoretical operating efficiency of the underwater booster equipment corresponding to all the production data. The calculation result processor determines the operating status of the underwater pressurization device based on the average value of the relative deviation and the number of groups exceeding the preset acceptance threshold.

[0018] Thirdly, the technical solution adopted by the present invention is: a computer-readable storage medium for storing one or more programs, wherein the one or more programs include instructions, which, when executed by a computing device, cause the computing device to perform any of the methods described above.

[0019] Fourthly, the technical solution adopted by the present invention is: a terminal, comprising: at least one processor; a memory for storing at least one processor-executable instruction; wherein the at least one processor is configured to execute instructions to implement the above-described method.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The underwater booster equipment operation status diagnosis method proposed in this invention replaces manual experience judgment by comparing and analyzing actual efficiency with theoretical efficiency. The diagnosis is more objective and timely, effectively avoiding equipment shutdown due to delayed diagnosis and ensuring the safety of oil and gas production.

[0021] 2. The underwater booster equipment operation status diagnosis method proposed in this invention adopts statistical analysis of multiple sets of data, and combines the average deviation and the number of groups exceeding the standard with dual threshold judgment to reduce misjudgment caused by instantaneous data fluctuations, making equipment anomaly identification more stable and reliable.

[0022] 3. The underwater booster equipment operation status diagnosis method proposed in this invention can determine the necessity of equipment maintenance and output maintenance suggestions, achieve precise operation and maintenance, avoid over-maintenance or missed inspection, reduce operation and maintenance costs, and ensure the long-term efficient operation of underwater booster equipment. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a flowchart of the underwater booster equipment operation status diagnosis method in an embodiment of the present invention; Figure 2 This is a schematic diagram of the underwater booster equipment operation status diagnosis system in an embodiment of the present invention. Detailed Implementation

[0024] To facilitate a clear description of the technical solutions in the embodiments of the present invention, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. For example, the first threshold and the second threshold are merely used to distinguish different thresholds and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" are not necessarily different.

[0025] It should be noted that in this invention, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0026] In this invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b, or c" can represent: a, b, c, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple.

[0027] To achieve the above objectives, this invention provides a method, system, medium, and terminal for diagnosing the operational status of underwater booster equipment. By periodically collecting production data from the underwater gathering and transportation system at preset time intervals, and calculating the average relative deviation of all groups and the number of groups whose relative deviation exceeds a preset acceptance threshold, the operational status of the underwater booster equipment is ultimately determined, enabling periodic assessment of its operational status. This effectively solves the problem of untimely equipment diagnosis and provides a basis for on-site operation and maintenance decisions, ensuring the safe and stable operation of offshore oil and gas development.

[0028] The present invention will be further described in detail below with reference to specific embodiments.

[0029] Example 1, as Figure 1 As shown in the figure, this embodiment of the invention provides a method for diagnosing the operating status of an underwater booster device, which specifically includes the following steps: 1) Collect production data from the underwater gathering and transportation system periodically at preset time intervals to obtain multiple sets of production data; each set of production data must include at least the inlet pressure of the underwater booster equipment. Inlet temperature Export pressure outlet temperature Flow rate of slug trap outlet fluid under standard conditions and the output voltage of the frequency converter and output current ; 2) Based on the inlet pressure, inlet temperature, outlet pressure, outlet temperature, and standard flow rate of the fluid at the outlet of the slug catcher in each set of production data, calculate the inlet fluid flow rate and outlet fluid flow rate of the underwater booster corresponding to that set of production data. 3) Based on the inlet fluid volumetric flow rate and outlet fluid volumetric flow rate of the underwater booster equipment corresponding to each set of production data, as well as the output voltage and output current of the frequency converter, calculate the actual operating efficiency and the corresponding theoretical operating efficiency of the underwater booster equipment corresponding to each set of production data, and further calculate the relative deviation between the actual operating efficiency and the theoretical operating efficiency of the underwater booster equipment corresponding to each set of production data. 4) Based on the relative deviation between the actual operating efficiency and the theoretical operating efficiency of the underwater booster equipment corresponding to all production data, calculate the average value of all relative deviations and the number of groups whose relative deviations exceed the preset acceptance threshold; 5) Determine the operating status of the underwater booster equipment based on the average value of the relative deviation and the number of groups exceeding the preset acceptance threshold.

[0030] Through the above steps, in this embodiment, the inlet flow rate of the underwater booster equipment corresponding to each set of production data is calculated based on the collected production data. and export flow The system measures the relative deviation between the actual and theoretical operating efficiency of each group of the booster equipment. Based on the average of the relative deviations of all groups and the number of groups whose relative deviations exceed the preset acceptance threshold, the system compares these deviations with their corresponding preset judgment thresholds to ultimately determine the operating status of the underwater booster equipment. This enables regular assessment of the underwater booster equipment's operating status. This effectively solves the problem of untimely equipment diagnosis and provides a basis for on-site operation and maintenance decisions, ensuring the safe and stable operation of offshore oil and gas development.

[0031] As one possible implementation, in step 1) above, production data from the past 30 days can be collected, with a preset time interval of 1 hour per set, accumulating to 720 sets of production data.

[0032] As one possible implementation, step 2) above, calculating the inlet fluid volumetric flow rate and outlet fluid volumetric flow rate for each group of underwater booster devices, includes the following steps: 2.1) Calculate the mole fraction of natural gas in the inlet fluid of the underwater booster based on the inlet or outlet pressure, inlet or outlet temperature, and the relative density of natural gas in the inlet fluid of the underwater booster. Specifically, the formula for calculating the mole fraction of natural gas is: (1) in, The mole fraction of natural gas in the inlet fluid of the booster equipment is dimensionless. The inlet or outlet pressure of the underwater booster equipment, in MPa; The inlet or outlet temperature of the underwater pressurization equipment, in °C; The relative density of natural gas in the inlet fluid of the underwater booster is dimensionless.

[0033] 2.2) Calculate the dissolved gas-oil ratio based on the mole fraction of natural gas, the relative density of crude oil in the inlet fluid of the underwater booster equipment, and the relative molecular weight of the crude oil. The calculation formula is as follows: (2) in, The dissolved gas-oil ratio is expressed in m³. 3 / m 3 ; The relative density of crude oil in the inlet fluid of the underwater booster equipment is dimensionless. The value represents the relative molecular weight of crude oil in the inlet fluid of the underwater booster equipment, and is dimensionless.

[0034] 2.3) Based on the dissolved gas-oil ratio and the relative densities of natural gas and crude oil in the inlet fluid of the underwater booster equipment, the flow conversion coefficient is calculated using the following formula: (3) in, The flow conversion coefficient is dimensionless. The inlet fluid temperature of the booster equipment is ℃.

[0035] 2.4) Multiply the standard volumetric flow rate by the flow conversion factor corresponding to the inlet or outlet operating conditions of the underwater booster equipment to calculate the inlet or outlet fluid volumetric flow rate of the underwater booster equipment. The calculation formula is as follows: (4) in, This refers to the inlet or outlet fluid volumetric flow rate under pressure P and temperature T conditions, expressed in m³ / s. 3 / s; The fluid volumetric flow rate under standard conditions, in cubic meters per second (m³). 3 / s; is the flow conversion coefficient, which is dimensionless.

[0036] As one possible implementation, step 3) above, calculating the actual operating efficiency of each group of underwater booster devices, includes the following steps: 3.1) Calculate the voltage drop of the cable between the inverter and the motor based on the inverter's output current, and obtain the motor's input voltage and input current by combining the inverter's output voltage; Specifically, calculate the voltage drop of the cable between the frequency converter and the motor. for: (5) in, Voltage drop across the cable, in volts (V). The inverter's output current is expressed in amperes (A). The resistivity of a conductor is expressed in Ω·m. The length of the cable is in meters (m). The cross-sectional area of ​​the cable is expressed in meters (m²). 2 .

[0037] Specifically, the formulas for calculating the motor input voltage and input current are as follows: (6) (7) in, This refers to the motor input voltage, measured in volts (V). The input current to the motor, in amperes (A). 3.2) Calculate the motor input power based on the motor input voltage and input current, and combine this with the motor efficiency to calculate the input power of the underwater booster device; Specifically, the input power of the underwater pressurization equipment The calculation formula is: (8) (9) in, Input power for underwater booster equipment, in watts (W). The efficiency of the motor is dimensionless. This refers to the input power of the motor, measured in watts (W). This is the motor power factor, which is dimensionless.

[0038] 3.3) Calculate the output power of the underwater booster equipment based on its inlet and outlet flow rates and the pressure difference between the inlet and outlet. Specifically, the output power of the underwater pressurization equipment The calculation formula is: (10) in, The output power of the underwater booster equipment, measured in watts (W). The inlet flow rate of the underwater booster equipment, in m³ / s. 3 / s; The outlet flow rate of the underwater booster equipment, in m³ / s. 3 / s; The inlet pressure of the underwater booster equipment is expressed in Pa. This refers to the outlet pressure of the underwater pressurization equipment, expressed in Pa.

[0039] 3.4) Calculate the ratio of output power to input power to obtain the actual operating efficiency of the underwater booster equipment; Specifically, the actual operating efficiency of underwater pressurization equipment The calculation formula is: (11) in, The actual operating efficiency of the booster equipment is dimensionless.

[0040] As one possible implementation, in step 3) above, the theoretical operating efficiency of each group of underwater booster equipment is calculated by using a quadratic polynomial fitting based on the inlet flow rate of the underwater booster equipment and the inherent efficiency coefficient.

[0041] Specifically, the theoretical operating efficiency calculation formula for underwater pressurization equipment is as follows: (12) in, The theoretical operating efficiency of the underwater pressurization equipment is dimensionless. , , The inherent coefficient for calculating the theoretical operating efficiency of underwater pressurization equipment is dimensionless. The inlet flow rate of the underwater booster equipment is expressed in cubic meters per second (m³). 3 / s.

[0042] As one possible implementation, the method for determining the operating status of the underwater pressurization equipment in step 5) above is as follows: the average value of the relative deviation and the number of groups exceeding the preset acceptance threshold are compared with the corresponding preset judgment thresholds.

[0043] Specifically, the relative deviation between the actual and theoretical operating efficiency of the underwater booster equipment corresponding to the 720 sets of collected production data was analyzed. Calculate the relative deviation The number of groups exceeding the preset acceptance threshold (NUM), and all relative deviations. The average value of AVE.

[0044] (13) Set relative deviation If the preset acceptance threshold is 5%, then: (14) Where, n i =1 means that the relative deviation between the actual operating efficiency and the theoretical operating efficiency of the underwater booster equipment corresponding to the i-th set of production data exceeds the preset acceptance threshold; n i=0 means that the relative deviation between the actual operating efficiency and the theoretical operating efficiency of the underwater booster equipment corresponding to the i-th set of production data does not exceed the preset acceptance threshold.

[0045] Specifically, relative deviation The formula for calculating the number of groups NUM that exceed the preset acceptance threshold is: (15) Specifically, all relative deviations The formula for calculating the average value AVE is: (16) In this embodiment, if the average relative deviation AVE is greater than the preset average value threshold or the number of groups exceeding the preset acceptance threshold NUM is greater than the preset number of groups threshold, an abnormal operation signal of the underwater booster equipment is output; otherwise, a normal operation signal of the underwater booster equipment is output.

[0046] Specifically, the number of groups set The preset group number threshold is 2% × 720, and the relative deviation is... average The preset average threshold is 10%. If or If the condition is met, the output will be "The underwater booster equipment is malfunctioning and maintenance is recommended"; otherwise, the output will be "The underwater booster equipment is operating normally and it is recommended to perform another underwater booster equipment operation status diagnosis in 30 days".

[0047] Example 2: This embodiment of the invention provides an underwater booster equipment operation status diagnosis system, used to implement the underwater booster equipment operation status diagnosis methods described in the above embodiments. In this embodiment, as... Figure 2 As shown, the metering system includes: Data acquisition module 1 is used to periodically collect production data from the underwater gathering and transportation system at preset time intervals to obtain multiple sets of production data; wherein each set of production data includes at least the inlet pressure, inlet temperature, outlet pressure, outlet temperature of the underwater booster device 6, the volumetric flow rate of the fluid at the outlet of the slug catcher 7 under standard conditions, and the output voltage and output current of the frequency converter 8. The flow calculation module 2 is used to calculate the inlet fluid volumetric flow rate and outlet fluid volumetric flow rate of the underwater booster device 6 corresponding to each set of production data based on the inlet pressure, inlet temperature, outlet pressure, outlet temperature, and standard condition volumetric flow rate of the fluid at the outlet of the slug catcher 7 in each set of production data. The efficiency calculation module 3 is used to calculate the actual operating efficiency and the corresponding theoretical operating efficiency of the underwater booster equipment 6 corresponding to each set of production data based on the inlet fluid volume flow rate and outlet fluid volume flow rate of the underwater booster equipment 6 corresponding to each set of production data, as well as the output voltage and output current of the frequency converter 8. The relative deviation calculation module 4 calculates the relative deviation between the actual operating efficiency and the theoretical operating efficiency of the underwater booster equipment 6 corresponding to each set of production data; The judgment condition determination module 5 calculates the average value of all relative deviations and the number of groups whose relative deviations exceed the preset acceptance threshold based on the relative deviations between the actual operating efficiency and the theoretical operating efficiency of the underwater booster equipment 6 corresponding to all production data. The calculation results processor 9 determines the operating status of the underwater pressurization device 6 based on the average value of the relative deviation and the number of groups exceeding the preset acceptance threshold.

[0048] As one possible implementation, this embodiment combines Figure 2 To further explain, the underwater booster equipment operation status diagnostic system also includes: manifold 10, subsea pipeline 11, PCS server 12, central data processor 13, flow sensor 14, first pressure sensor 15, first temperature sensor 16, second pressure sensor 17, second temperature sensor 18, voltage sensor 19, and current sensor 20.

[0049] The fluids produced by each subsea production well are collected by manifold 10 and flow into subsea booster equipment 6. After being boosted, they enter subsea pipeline 11 and finally flow from the outlet of subsea pipeline 11 into slug trap 7.

[0050] The submersible booster device 6 is equipped with a first pressure sensor 15 and a first temperature sensor 16 at its inlet, and a second pressure sensor 17 and a second temperature sensor 18 at its outlet. The slug trap 7 is equipped with a flow sensor 14 at its outlet. A voltage sensor 19 and a current sensor 20 are installed on the frequency converter 8 connected to the submersible booster device 6. Data collected by each sensor is transmitted in real-time to the PCS server 12 in the control room of the offshore oil and gas production platform. The data acquisition module 1 collects production data from the PCS server 12 for the most recent 30 days.

[0051] The flow calculation module 2, efficiency calculation module 3, relative deviation calculation module 4, and judgment condition determination module 5 are located in the central data processor 13. The central data processor 13 is electrically connected to the data acquisition module 1 and the calculation result processor 9, and is used to receive the acquired data, complete the relevant calculation analysis, and output the equipment operation status judgment result.

[0052] Example 3: In one embodiment of the present invention, a non-transitory computer-readable storage medium is provided, which stores server instructions that cause a computer to execute the methods provided in the above embodiments.

[0053] Example 4: This embodiment of the invention provides a terminal, including: At least one processor; Memory used to store at least one processor-executable instruction; In this invention, at least one processor is configured to execute instructions to implement the active closed-loop micro-thrust measurement method based on the application model predictive control algorithm proposed in this invention.

[0054] Although the invention has been described herein in conjunction with various embodiments, those skilled in the art will understand and implement other variations of the disclosed embodiments by reviewing the accompanying drawings, the disclosure, and the description of the drawings, in carrying out the claimed invention. In this specification, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple components. A single processor or other unit can implement several of the functions listed in the specification. While certain measures are described in different embodiments, this does not mean that these measures cannot be combined to produce good results.

[0055] Although the invention has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made therein without departing from the spirit and scope of the invention. Accordingly, this specification and drawings are merely illustrative of the invention and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if such modifications and modifications fall within the scope of the invention and its equivalents, the invention is also intended to include such modifications and modifications.

Claims

1. A method for diagnosing the operating status of an underwater booster device, characterized in that, include: According to a preset time interval, production data is periodically collected from the underwater gathering and transportation system in groups to obtain multiple sets of production data; wherein, each set of production data includes at least the inlet pressure, inlet temperature, outlet pressure and outlet temperature of the underwater booster equipment, the volumetric flow rate of the fluid at the outlet of the slug catcher under standard conditions, and the output voltage and output current of the frequency converter. Based on the inlet pressure, inlet temperature, outlet pressure and outlet temperature of the underwater booster equipment and the standard flow rate of the fluid at the outlet of the slug catcher in each set of production data, the inlet fluid flow rate and outlet fluid flow rate of the underwater booster equipment corresponding to that set of production data are calculated. Based on the calculated inlet fluid volumetric flow rate and outlet fluid volumetric flow rate of the underwater booster corresponding to each set of production data, as well as the output voltage and output current of the frequency converter, the actual operating efficiency and theoretical operating efficiency of the underwater booster corresponding to each set of production data are calculated respectively, and the relative deviation between the actual operating efficiency and the theoretical operating efficiency of the underwater booster corresponding to each set of production data is further calculated. Based on the relative deviation between the actual operating efficiency and the theoretical operating efficiency of the underwater booster equipment corresponding to all the production data, calculate the average value of all the relative deviations and the number of groups where the relative deviation exceeds a preset acceptance threshold; The operating status of the underwater pressurization device is determined based on the average value of the relative deviation and the number of groups exceeding the preset acceptance threshold.

2. The method for diagnosing the operating status of underwater booster equipment according to claim 1, characterized in that, Calculate the inlet or outlet fluid volumetric flow rate of the underwater booster equipment, including: Calculate the mole fraction of natural gas in the inlet fluid of the underwater pressurization equipment based on the inlet or outlet pressure, inlet or outlet temperature, and relative density of natural gas in the inlet fluid of the underwater pressurization equipment. The dissolved gas-oil ratio is calculated based on the mole fraction of natural gas, the relative density of crude oil in the inlet fluid of the underwater booster equipment, and the relative molecular weight of crude oil. The flow conversion coefficient is calculated based on the dissolved gas-oil ratio and the relative density of natural gas and crude oil in the inlet fluid of the underwater booster equipment. The inlet or outlet fluid volumetric flow rate of the underwater booster is calculated by multiplying the standard volumetric flow rate by the flow conversion coefficient corresponding to the inlet or outlet conditions of the underwater booster.

3. The method for diagnosing the operating status of underwater booster equipment according to claim 2, characterized in that, The inlet fluid volumetric flow rate or the outlet fluid volumetric flow rate is: In the formula, This refers to the inlet or outlet fluid volumetric flow rate, in cubic meters per second (m³). 3 / s; Volumetric flow rate under standard conditions, in cubic meters (m³). 3 / s; The flow conversion coefficient is dimensionless. The dissolved gas-oil ratio is dimensionless. The relative density of natural gas in the inlet fluid of the booster equipment is dimensionless. The relative density of crude oil in the inlet fluid of the booster equipment is dimensionless. The inlet fluid temperature of the booster equipment is ℃.

4. The method for diagnosing the operating status of underwater booster equipment according to claim 1, characterized in that, Calculating the actual operating efficiency of the underwater booster equipment includes: Calculate the voltage drop of the cable between the inverter and the motor based on the inverter's output current, and combine this with the inverter's output voltage to obtain the motor's input voltage and input current; The input power of the motor is calculated based on the input voltage and input current of the motor, and the input power of the underwater booster device is calculated by combining the motor efficiency. Calculate the output power of the underwater booster based on the inlet and outlet flow rates and the pressure difference between the inlet and outlet. The ratio of the output power to the input power is calculated to obtain the actual operating efficiency of the underwater booster equipment.

5. The method for diagnosing the operating status of underwater booster equipment according to claim 4, characterized in that, The input power of the underwater booster device is: The output power of the underwater booster device is: In the formula, Input power for underwater booster equipment, in watts (W). is the input power of the motor, in watts (W); ed is the motor efficiency, dimensionless. The output power of the underwater booster equipment, measured in watts (W). The inlet flow rate of the underwater booster equipment, in cubic meters (m³). 3 / s; The outlet flow rate of the underwater booster equipment, in cubic meters (m³). 3 / s; The pressure at the inlet of the booster equipment is expressed in Pa. The pressure is the outlet pressure of the booster equipment, expressed in Pa.

6. The method for diagnosing the operating status of underwater booster equipment according to claim 1, characterized in that, The theoretical operating efficiency of the underwater booster equipment is calculated by using a quadratic polynomial fitting based on the inlet flow rate of the underwater booster equipment and the inherent efficiency coefficient.

7. The method for diagnosing the operating status of underwater booster equipment according to claim 1, characterized in that, The determination of the operating status of the underwater pressurization equipment specifically includes: The average value of the relative deviation and the number of groups exceeding the preset acceptance threshold are compared with the corresponding preset thresholds. If the average relative deviation is greater than a preset average threshold or the number of groups exceeding a preset acceptance threshold is greater than a preset number of groups threshold, then an abnormal operation signal for the underwater booster equipment will be output. Otherwise, output a signal indicating that the underwater booster equipment is operating normally.

8. A diagnostic system for the operational status of an underwater booster device, characterized in that, include: The data acquisition module is used to periodically collect production data from the underwater gathering and transportation system at preset time intervals to obtain multiple sets of production data; wherein each set of production data includes at least the inlet pressure, inlet temperature, outlet pressure, outlet temperature of the underwater booster equipment, the volumetric flow rate of the fluid at the outlet of the slug catcher under standard conditions, and the output voltage and output current of the frequency converter. The flow calculation module is used to calculate the inlet fluid volumetric flow rate and outlet fluid volumetric flow rate of the underwater booster equipment corresponding to each set of production data, based on the inlet pressure, inlet temperature, outlet pressure, outlet temperature and the standard volumetric flow rate of the fluid at the outlet of the slug catcher in each set of production data. The efficiency calculation module is used to calculate the actual operating efficiency and the corresponding theoretical operating efficiency of the underwater booster equipment corresponding to each set of production data based on the inlet fluid volume flow rate and outlet fluid volume flow rate of the underwater booster equipment corresponding to each set of production data, as well as the output voltage and output current of the frequency converter. The relative deviation calculation module calculates the relative deviation between the actual operating efficiency and the theoretical operating efficiency of the underwater booster equipment corresponding to each set of production data; The judgment condition determination module calculates the average value of all relative deviations and the number of groups where the relative deviation exceeds a preset acceptance threshold, based on the relative deviation between the actual operating efficiency and the theoretical operating efficiency of the underwater booster equipment corresponding to all the production data. The calculation result processor determines the operating status of the underwater pressurization device based on the average value of the relative deviation and the number of groups exceeding the preset acceptance threshold.

9. A computer-readable storage medium for storing one or more programs, characterized in that, The one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods described in claims 1 to 7.

10. A terminal, characterized in that, include: At least one processor; Memory used to store at least one processor-executable instruction; In this embodiment, at least one processor is configured to execute instructions to implement the method as described in any one of claims 1 to 7.

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