CN118551699B - Deep water christmas tree nozzle performance curve fitting method and system - Google Patents
Deep water christmas tree nozzle performance curve fitting method and system Download PDFInfo
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Abstract
The invention discloses a deep water christmas tree oil nozzle performance curve fitting method, which is characterized in that a LedaFlow dynamic model is built according to the opening degree of a christmas tree oil nozzle, the front/back pressure of the christmas tree oil nozzle, the flow rate of oil and gas water of the christmas tree, a submarine pipeline, a vertical pipe and the like, a PID controller is arranged on an outlet pipeline of the underwater christmas tree, a control variable of the controller is the opening degree of the christmas tree oil nozzle, back pressure after the oil nozzle is fixed, the opening degree of the oil nozzle is regulated by the PID controller to match the oil and gas water yield of the christmas tree and the pressure before the oil nozzle, and at least 5 groups of data are utilized to obtain a corresponding curve of the opening degree of the oil nozzle and a Cv value; when engineering project development or digital twin system modeling is carried out, the fitted curve is utilized to replace a choke performance curve provided by an original christmas tree manufacturer, the yield change of the christmas tree under the working conditions of initial starting, production lifting or restarting and the like is more accurately simulated, an accurate lifting curve of the temperature of a wellhead of the christmas tree is obtained, a well opening program and a hydrate inhibitor injection scheme in the well opening process are optimized, and the influence of different oil, gas and water yields and sea pipe back pressure is analyzed by utilizing a model.
Description
Technical Field
The invention relates to a production flow of offshore oil engineering, in particular to a deep water christmas tree nozzle performance curve fitting method and system.
Background
The underwater christmas tree is generally provided with a multiphase flowmeter for detecting the single well yield, the single well yield and the pressure of the christmas tree are controlled by utilizing a choke to meet the production operation and oil deposit management requirements, and an on-site operator generally jointly controls the single well yield according to the opening degree of the choke and the multiphase flow count value.
In the prior art, because of the limitation of factors such as safety, environmental protection and the like, before the christmas tree choke leaves the factory, manufacturers generally use air and water to calibrate the choke performance curve; the properties such as the compressibility, density, molecular weight and the like of air and water are greatly different from those of natural gas and condensate oil, so that a certain error exists in actual production application of a nozzle performance curve calibrated by the air and the water when leaving a factory, and the corresponding relation between the opening of the nozzle of the underwater christmas tree and the oil, gas and water yield cannot be accurately estimated.
Disclosure of Invention
The invention aims to solve the technical problem of providing a deep water christmas tree choke performance curve fitting method and system, which can accurately evaluate the corresponding relation between the opening of an underwater christmas tree choke and the oil, gas and water yield.
In order to solve the technical problems, the invention provides a deep water christmas tree nozzle performance curve fitting system, which comprises an oil reservoir, a christmas tree, a submarine pipeline, a vertical pipe and a processing platform; the oil reservoir is connected with the christmas tree, a liquid outlet of the christmas tree is connected with an outlet pipeline, the end part of the outlet pipeline is connected with the submarine pipeline, and the submarine pipeline is communicated with the processing platform through the vertical pipe;
The oil nozzle and the flow transmitter are arranged on the outlet pipeline, the oil nozzle and the flow transmitter are respectively connected with a Proportional Integral Derivative (PID) controller, the control variable of the PID controller is the opening of the oil nozzle, the pressure after the oil nozzle is fixed, the oil nozzle opening is regulated by the PID controller to match the oil-gas-water yield of the production tree and the pressure before the oil nozzle, the flow coefficients corresponding to different oil nozzle openings are obtained according to the oil-gas-water yield of the production tree and the pressure before the oil nozzle, which are corresponding to a plurality of groups of different oil nozzle openings, the flow coefficients corresponding to different oil nozzle openings are fitted, and the relation curve between the oil nozzle opening and the flow coefficients is obtained.
In one embodiment: the oil reservoir is connected back to the christmas tree through a shaft, the submarine pipeline is utilized to connect back to the processing platform, and the processing platform can perform oil-gas-water separation, processing and output.
In one embodiment: the flow transmitter is used for acquiring at least 5 groups of oil, gas and water yield of the christmas tree and pressure in front of the oil nozzle, and the PID controller is used for obtaining flow coefficients corresponding to different oil nozzle openings according to at least 5 groups of oil, gas and water yield of the christmas tree and pressure in front of the oil nozzle and performing curve fitting.
The invention also provides a deep-water christmas tree nozzle performance curve fitting method, which is applied to the deep-water christmas tree nozzle performance curve fitting system and comprises the following steps:
s1: establishing LedaFlow a dynamic model according to the oil reservoir performance, the shaft parameters, the christmas tree structure and the submarine pipeline length;
s2: the opening of the oil nozzle of the production tree is logically controlled according to the arrangement of a flow transmitter and a PID controller at the position of the underwater production tree;
S3: the processing platform is simplified to be a pressure node in LedaFlow dynamic models, the pressure is maintained unchanged in the simulation process, and the pressure of the submarine pipeline pre-inflation body is the required pressure before the initial starting of the underwater christmas tree;
S4: the initial condition of the pressure before the nozzle of the christmas tree is the closing pressure, the initial condition of the temperature is the temperature of the ambient sea water, and the fluid in the shaft is separated into gas and liquid under the action of gravity;
S5: the set value of the flow parameter of the PID controller is the oil, gas and water yield of the Christmas tree, and the PID controller adjusts the opening degree of the oil nozzle to match the pressure in front of the oil nozzle;
s6: ledaFlow calculating a plurality of groups of oil, gas and water yield of the Christmas tree and pressure in front of the choke, and forming a relation curve between the opening degree of the choke and the flow coefficient.
In one embodiment: in step S1, a dynamic model LedaFlow is built by using LedaFlow software and a LedaFlow controller.
In one embodiment: and setting a PID controller according to the oil, gas and water yield of the production tree in the step S2.
In one embodiment: and in the step S6, the LedaFlow groups of oil, gas and water yield of the production tree and the pressure in front of the choke are calculated by the dynamic model of LedaFlow groups of the production tree, so that a curve corresponding to the opening degree and Cv value of the choke is formed.
The invention has the technical effects that: 1. the deep water christmas tree nozzle performance fitting system comprises an oil reservoir, a christmas tree, a submarine pipeline, a vertical pipe and a processing platform; the oil reservoir is connected with the christmas tree, the liquid outlet of the christmas tree is connected with an outlet pipeline, the end part of the outlet pipeline is connected with a submarine pipeline, the submarine pipeline is communicated with a processing platform through a vertical pipe, a glib and a flow transmitter are arranged on the outlet pipeline, the glib and the flow transmitter are respectively connected with a proportional integral differential PID controller, the control variable of the PID controller is the opening degree of the glib, the pressure after the glib is fixed, the opening degree of the glib is regulated by the PID controller to match the oil-gas-water yield of the christmas tree with the pressure before the glib, the flow coefficients corresponding to different glib openings are obtained according to the oil-gas-water yield of the christmas tree and the pressure before the glib corresponding to a plurality of groups of different glib openings, and the flow coefficients corresponding to different glib openings are fitted, so that a relation curve between the glib opening degree and the flow coefficients is obtained; when engineering project development or digital twin system modeling is carried out, the fitted curve is utilized to replace a nozzle performance curve provided by an original christmas tree manufacturer, so that the yield change of the christmas tree under the working conditions of initial starting, production lifting or restarting and the like is more accurately simulated, an accurate lifting curve of the temperature of a wellhead of the christmas tree is obtained, and a well opening program and a hydrate inhibitor injection scheme in the well opening process are optimized. In addition, the model can be used for analyzing the influence of different oil, gas and water yields and sea pipe back pressure, and can be popularized to the deep water oil and gas field development project of submarine pipelines with larger single well yield change, and has wide application prospect.
2. According to the deep water christmas tree oil and water nozzle performance curve fitting method, a dynamic model is built by utilizing LedaFlow software and controllers such as PID (proportion integration differentiation) and the like, a flow transmitter and a PID controller are arranged at an underwater wellhead, a set value of the PID controller is the oil and gas and water yield of the underwater christmas tree, a control variable of the controller is the opening degree of the christmas tree oil and water nozzle, back pressure after the oil nozzle is fixed, the opening degree of the oil and water yield of the christmas tree oil and water and the pressure before the oil nozzle are matched by utilizing the PID controller, and at least 5 groups of data are utilized to obtain corresponding curves of the opening degree of the oil nozzle and Cv value. When engineering project development or digital twin system modeling is carried out, the fitted curve is utilized to replace a nozzle performance curve provided by an original christmas tree manufacturer, so that the yield change of the christmas tree under the working conditions of initial starting, production lifting or restarting and the like is more accurately simulated, an accurate lifting curve of the temperature of a wellhead of the christmas tree is obtained, and a well opening program and a hydrate inhibitor injection scheme in the well opening process are optimized. In addition, the model can be used for analyzing the influence of different oil, gas and water yields and sea pipe back pressure, and can be popularized to the deep water oil and gas field development project of submarine pipelines with larger single well yield change, and has wide application prospect.
Drawings
FIG. 1 is a schematic diagram of a deep water christmas tree nozzle performance curve fitting system of the present invention;
FIG. 2 is a flow chart of a method for fitting the performance curve of the deep water christmas tree nozzle of the present invention.
The main reference numerals in the drawings illustrate:
1-oil reservoir, 2-shaft, 3-christmas tree, 4-flow transmitter, 5-PID controller, 6-oil nozzle, 7-submarine pipeline, 8-riser, 9-treatment platform; 10-outlet line; 11-submerged catchment.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to limit the invention, so that those skilled in the art may better understand the invention and practice it.
FIG. 1 is a schematic diagram of the deep water christmas tree 3 choke 6 performance fitting system of the present invention. As shown in FIG. 1, in one embodiment, a deep water tree 3 choke 6 performance fitting system includes a reservoir 1, a wellbore 2, a tree 3, a subsea conduit 7, a riser 8, and a processing platform 9. The oil reservoir 1 arranged at the bottom of the deepwater well is connected with the bottom end of the shaft 2, the top end of the shaft 2 is connected with the Christmas tree 3, the liquid outlet of the Christmas tree 3 is connected with an outlet pipeline, the end part of the outlet pipeline is connected with a submarine pipeline 7, and the submarine pipeline 7 is communicated with a processing platform 9 through a vertical pipe 8.
In one embodiment, a choke 6 and a flow transmitter 4 are arranged on an outlet pipeline, the choke 6 and the flow transmitter 4 are respectively connected with a proportional integral derivative (Proportion Integration Differentiation, PID) controller, a control variable of the PID controller 5 is the opening of the choke 6, the pressure after the choke is fixed, the choke opening is regulated by the PID controller 5 to match the oil-gas-water yield of the Christmas tree 3 and the pressure before the choke, flow coefficients corresponding to different choke openings are obtained according to the oil-gas-water yield of the Christmas tree 3 and the pressure before the choke corresponding to a plurality of groups of different choke openings, and the flow coefficients corresponding to the different choke openings are fitted to obtain a relation curve between the choke opening and the flow coefficients.
The treatment platform 9 may be used for separation, treatment and export of hydrocarbon water production fluids. The processing platform 9 may be provided with a multiphase separator, a pressure relief system, a flare system, etc., and the disclosure is not limited.
The nozzle 6 can control the pressure produced by the christmas tree 3 and the flow of the production fluid by adjusting the opening size, thereby ensuring the stable production of the oil and gas field. The opening of the oil nozzle 6 is also called an opening degree, when the opening degree of the oil nozzle is larger, the flow rate of the production fluid passing through the oil nozzle 6 is larger, the flow area of the oil nozzle 6 is increased along with the caliber increase or the opening degree increase, so that the speed of the production fluid passing through the oil nozzle 6 is reduced, and the flow rate is increased; accordingly, the smaller the nozzle opening, the smaller the flow rate of the production fluid through the nozzle 6.
Under the condition that stratum energy is unchanged, the smaller the opening of the oil nozzle, the larger the pressure loss through the oil nozzle 6, the smaller the flow, and correspondingly, the larger the opening of the oil nozzle, the smaller the pressure loss through the oil nozzle 6, and the larger the flow.
When in use, in order to ensure that the formation pressure is gradually reduced along with the exploitation of the oil reservoir 1, the opening degree of the oil nozzle needs to be gradually adjusted, and the circulation channel is enlarged. In the related art, the performance curve of the oil nozzle 6 calibrated by using air, water and the like when the oil nozzle 6 leaves a factory is adopted, and errors exist in actual production and application, so that the relation curve between the opening degree and the flow coefficient of the oil nozzle at different stages needs to be accurately determined.
It should be noted that the selection of the nozzle tip 6 may be determined according to actual needs, which is not specifically limited in the present disclosure.
The flow transducer 4 is also called a multiphase flow sensor and can detect the temperature, pressure, oil, gas and water yield and the like of the production fluid to be detected.
The flow transmitter 4 is connected with the PID controller 5, so that an electric signal which is measured by the flow transmitter 4 and is in direct proportion to the flow is transmitted to the PID controller 5, the PID controller 5 is enabled to adjust the opening of the oil nozzle 6 according to the electric signal, the pressure in front of the oil nozzle and the oil-gas-water yield of the christmas tree 3 are adjusted, the flow coefficients under different oil nozzle openings are obtained through calculation according to the pressure in front of the oil nozzle and the oil-gas-water yield of the christmas tree 3, and the flow coefficients under different oil nozzle openings are fitted to obtain a relation curve between the oil nozzle opening and the flow coefficients.
The PID controller 5 is an automatic controller composed of a proportional unit P, an integral unit I, and a differential unit D, and can be used for a system whose dynamic characteristics are substantially linear and do not change with time by setting three parameters of Kp, ki, and Kd.
In one embodiment, the control variable of the PID controller 5 is the opening degree of the choke of the christmas tree 3, the pressure after the choke is fixed, the oil-gas-water yield and the pressure before the choke of the christmas tree 3 are matched by adjusting the opening degree of the choke, the oil-gas-water yield and the pressure before the choke under a plurality of groups of different opening degrees of the choke are recorded respectively, the flow coefficients under different opening degrees of the choke are calculated according to the oil-gas-water yield and the pressure before the choke, and the flow coefficients under different opening degrees of the choke are fitted to obtain a relation curve between the opening degree of the choke and the flow coefficients.
The oil gas water yield and the pressure in front of the oil nozzle under the opening degree of at least 5 groups of different oil nozzles are required to be collected, so that the accuracy of curve fitting is ensured.
It should be noted that, the number of data sets for performing curve fitting may be determined according to actual requirements, and as the production process is continuously developed, the number of data sets is gradually increased, and the relationship curve between the opening of the nozzle and the flow coefficient obtained by fitting is also more and more accurate.
And under the same oil nozzle opening degree, the oil gas and water yield and the pressure before the oil nozzle can be acquired for multiple times, and the average value of the oil gas and water yield and the average value of the pressure before the oil nozzle are averaged to perform curve fitting, so that parameter detection errors caused by fluctuation of production fluid in a pipeline are reduced, and the fitting accuracy is improved.
The relationship between the flow rate Q and the flow coefficient Cv of the field nozzle 6 is expressed by the following formula:
q=cv×a×sqrt (2Δp/ρ) (equation one)
Q represents the flow passing through the oil nozzle 6, the unit is m 3/s, L/min and the like, and the unit of Q is determined according to specific application scenes and requirements; cv is the flow coefficient, cv is a parameter related to the structure and fluid properties of the nozzle 6 describing the flow characteristics of the production fluid through the nozzle 6; a is the sectional area of the nozzle tip 6, the unit is m 2 or cm 2, and the like, and can be calculated according to the geometric dimension of the nozzle tip 6; Δp is the pressure difference between the pressure before the oil nozzle and the pressure after the oil nozzle, the unit is Pa or Bar, and the pressure before the oil nozzle and the pressure after the oil nozzle are measured by a flow transmitter 4, and then the pressure difference before the oil nozzle and the pressure after the oil nozzle are calculated; ρ is the density of the production fluid in kg/m 3 or g/cm 3, etc., and depending on the type and condition of the production fluid, ρ can be obtained by experiment or by referring to the relevant data.
After the PID controller 5 adjusts the opening of the nipple, the pressure before the nipple and the pressure after the nipple can be measured by the flow transmitter 4, the pressure difference before and after the nipple 6 is obtained by calculation, the flow through the nipple 6 is collected by the flow transmitter 4, the cross-sectional area of the nipple 6 and the density of the production fluid are constants, and thus, the flow coefficient corresponding to the opening of the nipple can be obtained according to the formula one.
And after the flow coefficients under the plurality of groups of the nozzle openings are obtained, curve fitting is carried out on the plurality of groups of the nozzle openings and the flow coefficients, so that the corresponding relation between the nozzle openings and the flow coefficients can be obtained.
In one embodiment, the downhole reservoir 1 is tiebased through the wellbore 2 to the subsea tree 3, and the treatment platform 9 is tiebased with subsea piping 7, the treatment platform 9 being operable for oil-gas-water separation, treatment and export.
In one implementation, the system may include a plurality of christmas trees 3, with the outlet line connected to the outlet of each christmas tree 3 connecting to a submerged manifold, the bottom end of which communicates with a subsea pipeline 7.
In the present disclosure, ledaFlow software may be employed to construct LedaFlow dynamic models based on parameters such as reservoir 1 performance, wellbore 2 parameters, tree 3 structure, subsea pipeline 7 length, etc. The processing platform 9 can be simplified as a pressure node in LedaFlow dynamic model, and the pressure of the processing platform 9 is kept unchanged in the fitting process, and the pre-inflation gas pressure of the submarine pipeline 7 is set as the pressure required before the initial start of the subsea tree 3.
The initial condition of the pressure before the choke of the christmas tree 3 is the closing pressure, the initial condition of the temperature is the temperature of the ambient seawater, and the produced fluid is separated into gas and liquid under the action of gravity. The set value of the flow parameter of the PID controller 5 is the oil, gas and water yield of the production tree 3, and the opening of the choke is adjusted to match the pressure in front of the choke. LedaFlow sets of oil gas water yield and pressure in front of the oil nozzle under different oil nozzle openings are calculated through a dynamic model, flow coefficients under different oil nozzle openings are obtained through calculation, and then a relation curve between the oil nozzle openings and the flow coefficients is obtained for the flow coefficients under different oil nozzle openings. And the fitted relation curve is used for replacing the performance curve of the choke 6 provided by a manufacturer of the Christmas tree 3, so that the yield change of the Christmas tree 3 under the working conditions of initial starting, production lifting or restarting and the like is more accurately simulated, an accurate lifting curve of the wellhead temperature of the Christmas tree 3 is obtained, and the well opening program and the hydrate inhibitor injection scheme in the well opening process are optimized. In addition, the model can be used for analyzing the influence of different oil and gas water yields and sea pipe back pressure, and can be popularized to deep water oil and gas field development projects of submarine pipelines 7 with larger single well yield change, and has wide application prospects.
FIG. 2 is a graph of the deep water christmas tree nozzle performance curve fitting method of the present invention. As shown in fig. 2, in one embodiment, a deep-water christmas tree nozzle performance curve fitting method is applied to the deep-water christmas tree nozzle performance curve fitting system in the above embodiment, and the method includes the following steps:
s1: establishing LedaFlow a dynamic model according to the performance of the oil reservoir 1, parameters of the shaft 2, the structure of the christmas tree 3 and the length of the submarine pipeline 7;
s2: the opening of a choke 6 of the production tree 3 is logically controlled according to the arrangement of a flow transmitter 4 and a PID controller 5 at the position of the underwater production tree 3;
S3: the processing platform 9 is simplified into a pressure node in LedaFlow dynamic model, the pressure is maintained unchanged in the simulation process, and the pre-inflation gas pressure of the submarine pipeline 7 is the required pressure before the initial starting of the underwater Christmas tree 3;
s4: the initial condition of the pressure before the choke 6 of the christmas tree 3 is the closing pressure, the initial condition of the temperature is the temperature of the ambient sea water, and the fluid in the shaft 2 is separated into gas and liquid under the action of gravity;
S5: the set value of the flow parameter of the PID controller 5 is the oil, gas and water yield of the Christmas tree 3, and the opening of the oil nozzle is adjusted by the PID controller 5 to match the pressure in front of the oil nozzle;
S6: ledaFlow calculating a plurality of groups of oil, gas and water yield of the Christmas tree 3 and pressure in front of the choke, and forming a relation curve between the opening degree of the choke and the flow coefficient.
In one embodiment: in step S1, a dynamic model LedaFlow may be built using LedaFlow software and LedaFlow controller.
In one embodiment: the PID controller 5 is set according to the oil, gas and water yield of the Christmas tree 3 in the step S2.
In one embodiment: and in the step S6, the LedaFlow groups of data are calculated by the dynamic model to form a curve corresponding to the opening degree of the oil nozzle and the Cv value.
It should be noted that, the implementation manner of the method embodiment is similar to that of the system embodiment, and the description thereof is omitted.
In the embodiment of the invention, a dynamic model is built by utilizing LedaFlow software and controllers such as PID (proportion integration differentiation) and the like, a flow transmitter 4 and a PID controller 5 are arranged at an underwater wellhead, the set value of the PID controller 5 is the oil-gas-water yield of the underwater Christmas tree 3, the control variable of the controller is the opening degree of a choke of the Christmas tree 3, the back pressure of the choke 6 is fixed, the opening degree of the choke is regulated by the PID controller 5 to match the oil-gas-water yield of the Christmas tree 3 and the pressure before the choke, and at least 5 groups of data are utilized to obtain a curve corresponding to the opening degree of the choke and Cv value. When engineering project development or digital twin system modeling is carried out, the fitted curve is utilized to replace the performance curve of the choke 6 provided by the original christmas tree 3 manufacturer, the yield change of the christmas tree 3 under the working conditions of initial starting, production lifting or restarting and the like is more accurately simulated, the accurate lifting curve of the wellhead temperature of the christmas tree 3 is obtained, and the well opening program and the hydrate inhibitor injection scheme in the well opening process are optimized. In addition, the model can be used for analyzing the influence of different oil and gas water yields and sea pipe back pressure, and can be popularized to deep water oil and gas field development projects of submarine pipelines 7 with larger single well yield change, and has wide application prospects.
The above embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (7)
1. A deep water christmas tree nozzle performance curve fitting system is characterized in that: the system comprises an oil reservoir, a christmas tree, a submarine pipeline, a vertical pipe and a processing platform; the oil reservoir is connected with the christmas tree, a liquid outlet of the christmas tree is connected with an outlet pipeline, the end part of the outlet pipeline is connected with the submarine pipeline, and the submarine pipeline is communicated with the processing platform through the vertical pipe;
The oil nozzle and the flow transmitter are arranged on the outlet pipeline, the oil nozzle and the flow transmitter are respectively connected with a Proportional Integral Derivative (PID) controller, the control variable of the PID controller is the opening of the oil nozzle, the pressure after the oil nozzle is fixed, the oil nozzle opening is regulated by the PID controller to match the oil-gas-water yield of the production tree and the pressure before the oil nozzle, the flow coefficients corresponding to different oil nozzle openings are obtained according to the oil-gas-water yield of the production tree and the pressure before the oil nozzle, which are corresponding to a plurality of groups of different oil nozzle openings, the flow coefficients corresponding to different oil nozzle openings are fitted, and the relation curve between the oil nozzle opening and the flow coefficients is obtained.
2. The deep water christmas tree nozzle performance curve fitting system of claim 1, wherein: the oil reservoir is connected back to the christmas tree through a shaft, the submarine pipeline is utilized to connect back to the processing platform, and the processing platform can perform oil-gas-water separation, processing and output.
3. The deep water christmas tree nozzle performance curve fitting system of claim 1, wherein: the flow transmitter is used for acquiring at least 5 groups of oil, gas and water yield of the christmas tree and pressure in front of the oil nozzle, and the PID controller is used for obtaining flow coefficients corresponding to different oil nozzle openings according to at least 5 groups of oil, gas and water yield of the christmas tree and pressure in front of the oil nozzle and performing curve fitting.
4. A method for fitting a deep-water christmas tree nozzle performance curve, applied to the deep-water christmas tree nozzle performance curve fitting system according to any one of claims 1-3, comprising:
s1: establishing LedaFlow a dynamic model according to the oil reservoir performance, the shaft parameters, the christmas tree structure and the submarine pipeline length;
s2: the opening of the oil nozzle of the production tree is logically controlled according to the arrangement of a flow transmitter and a PID controller at the position of the underwater production tree;
S3: the processing platform is simplified to be a pressure node in LedaFlow dynamic models, the pressure is maintained unchanged in the simulation process, and the pressure of the submarine pipeline pre-inflation body is the required pressure before the initial starting of the underwater christmas tree;
S4: the initial condition of the pressure before the nozzle of the christmas tree is the closing pressure, the initial condition of the temperature is the temperature of the ambient sea water, and the fluid in the shaft is separated into gas and liquid under the action of gravity;
S5: the set value of the flow parameter of the PID controller is the oil, gas and water yield of the Christmas tree, and the PID controller adjusts the opening degree of the oil nozzle to match the pressure in front of the oil nozzle;
s6: ledaFlow calculating a plurality of groups of oil, gas and water yield of the Christmas tree and pressure in front of the choke, and forming a relation curve between the opening degree of the choke and the flow coefficient.
5. The deep water christmas tree nozzle performance curve fitting method according to claim 4, wherein the method comprises the following steps: in step S1, a dynamic model LedaFlow is built by using LedaFlow software and a LedaFlow controller.
6. The deep water christmas tree nozzle performance curve fitting method according to claim 4, wherein the method comprises the following steps: and setting a PID controller according to the oil, gas and water yield of the production tree in the step S2.
7. The deep water christmas tree nozzle performance curve fitting method according to claim 4, wherein the method comprises the following steps: and in the step S6, the LedaFlow groups of oil, gas and water yield of the production tree and the pressure in front of the choke are calculated by the dynamic model of LedaFlow groups of the production tree, so that a curve corresponding to the opening degree and Cv value of the choke is formed.
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