Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an online operation performance evaluation method of distributed wellhead heating equipment, which realizes online operation of two heating equipment under different working conditions in a serial or parallel mode by establishing a distributed wellhead heating test platform, and establishes a heating performance parameter linear equation according to data acquired by the heating test platform.
The invention is realized by the following technical scheme that the online operation performance evaluation method of the distributed wellhead heating equipment comprises the following steps:
Step S1, a distributed wellhead heating test platform is established, the wellhead heating test platform comprises a distributed heating system, a simulated heat load and a measurement and control system, the distributed heating system comprises two heating devices which are connected through a pipeline and a plurality of valves, the connection of the two heating devices can be switched into series connection or parallel connection through a switch combination of control valves, the simulated heat load can be matched with the heat load of an actual wellhead, the measurement and control system can control the switch of the valves and the operation power of each heating device, the temperature and the flow of a heat exchange medium at different positions are collected through sensors, and heating parameters of each operation mode of each working condition can be calculated according to data collected by the sensors.
Step S2, controlling the on-line operation modes of two heating devices to be in series connection, respectively performing series connection mode test under three working conditions of full load, 50% load and minimum load of the simulated heat load, and performing linear fitting by using a least square method to obtain a heating performance parameter linear equation during series connection operation under each working condition;
Step S3, controlling the on-line operation modes of the two heating devices to be parallel connection, respectively carrying out parallel connection mode test under three working conditions of full load, 50% load and minimum load of the simulated heat load, and carrying out linear fitting by using a least square method to obtain a heating performance parameter linear equation during parallel connection operation under each working condition;
and S4, according to different heating performance parameter linear equations and combining the requirements of an actual wellhead, heating equipment and an operation mode which are matched with the actual wellhead can be determined, and efficient operation of the heating equipment is ensured.
In general, series operation is suitable for the condition of higher heat load demand, heat exchange media can be subjected to cascade heating to achieve the required high temperature through series operation, when the heat exchange media enter the distributed heating system to enable the temperature to be unchanged, the temperature after different heat exchange media are heated is set to linearly change the whole energy consumption, parallel operation is more suitable for the condition of higher heat load demand and higher flow, when two heating devices are connected in parallel, the two heating devices can be regarded as distribution of the heat load, one heating device is set to provide 50% of the heat load, the power ratio of the heating device is changed according to the obtained linear equation and the condition of the on-site heat load, the whole energy consumption is linearly changed, a plurality of schemes meeting the heating demand of an actual wellhead can be obtained based on a distributed wellhead heating test platform, the heating scheme with highest heating efficiency can be determined based on the linear equation of the heating performance parameters, and further an accurate and objective basis is provided for the on-site wellhead heating device, and the method has higher meaning.
Further, the simulated heat load comprises a water tank and a water tower connected in series with the water inlet end of the water tank, a heat exchange medium is arranged in the water tank, the heat exchange medium continuously flows into the distributed heating system after being pressurized by a water pump, and the heated heat exchange medium flows into the water tower and flows back to the water tank after heat dissipation, so that circulation is formed. The simulated heat load can be adjusted by adjusting the water pump pressure to control the flow rate of the heat exchange medium, adjusting the water quantity in the water tank and the like.
Further, the step S2 specifically includes:
s21, in a series mode, taking the temperature of the heat exchange medium heated by the distributed heating system as a variable, wherein an output value corresponding to the variable is a heating performance parameter of the distributed wellhead heating test platform;
Step S22, testing the same value point of the variable in a plurality of time periods, wherein each time period can acquire a corresponding actually measured value of the heating performance parameter, preprocessing all actually measured values of the heating performance parameter, removing outliers in the actually measured values, and obtaining the corresponding actually measured value according to a formulaWherein Xi is the actual value of the measurement,The average value of the measured values is taken as an outlier, Yi >0.2 is selected as an output value corresponding to a value point of the current variable, and the average value of the residual measured values of the heating performance parameters is taken as an output value corresponding to the value point of the current variable;
Step S23, gradually increasing the value point of the variable, and obtaining a series of corresponding output values through step S22;
step S24, performing linear fitting by using a least square method to obtain a corresponding heating performance parameter linear equation, which is expressed as y=ax+b, where x is a variable, y is a heating performance parameter, and A, B is a pending parameter;
Wherein, X= [ X1,…,xn ], the element in X is the value point of the variable, Y= [ Y1,…,yn ], the element in Y is the output value corresponding to X;
And S25, respectively performing series mode test under three working conditions of full load, 50% load and minimum load of the simulated thermal load, and obtaining a heating performance parameter linear equation of each working condition through steps S22-S24.
Further, the step S3 specifically includes:
Step S31, in a parallel mode, taking the output power ratio of two heating devices as a variable, wherein the output corresponding to the variable is a heating performance parameter of the distributed wellhead heating test platform;
Step S32, testing the same value point of the variable in a plurality of time periods, wherein each time period can acquire a corresponding actually measured value of the heating performance parameter, preprocessing all actually measured values of the heating performance parameter, removing outliers in the actually measured values, and obtaining the value according to a formulaWherein Xi is the actual value of the measurement,The average value of the measured values is taken as an outlier, Yi >0.2 is selected as an output value corresponding to a value point of the current variable, and the average value of the residual measured values of the heating performance parameters is taken as an output value corresponding to the value point of the current variable;
step S33, gradually increasing the value point of the variable, and obtaining a series of corresponding output values through step S32;
Step S34, performing linear fitting by using a least square method to obtain a corresponding heating performance parameter linear equation, which is expressed as y=ax+b, where x is a variable, y is a heating performance parameter, and A, B is a pending parameter;
Wherein, X= [ X1,…,xn ], the element in X is the value point of the variable, Y= [ Y1,…,yn ], the element in Y is the output value corresponding to X;
And step S35, respectively performing parallel mode test under three working conditions of full load, 50% load and minimum load of the simulated thermal load, and obtaining a heating performance parameter linear equation of each working condition through steps S32-S34.
Further, the heating performance parameter is the thermal efficiency or energy efficiency ratio of the distributed heating system in the current working mode. The thermal efficiency and the energy efficiency ratio can be calculated through data acquired by the sensor, and the calculation result can be calculated and displayed in real time through the measurement and control system.
Further, the two heating devices are any two of three cleaning heating devices of PTC, solar energy and double-source heat pump.
Furthermore, the distributed heating system further comprises heat storage equipment which can be connected with two ends of the simulated heat load in parallel, valves are arranged at the inlet end and the outlet end of the heat storage equipment, and the measurement and control system can control a heat exchange medium to enter the heat storage equipment for heat exchange.
The heat storage unit is capable of heating the wellhead simulated heat load;
Further, the measurement and control system comprises a PLC, and the PLC can control the opening and closing of the valve and collect data of each sensor.
The heat exchange medium used in the present invention is water.
The distributed wellhead heating test platform has the advantages that the distributed wellhead heating test platform is built, the performance of two heating devices under different working conditions when the two heating devices are in on-line operation in a serial or parallel connection mode can be tested, a constant-temperature water inlet source in on-site heating is simulated through heat dissipation of a water tower through a circulating heat exchange medium, dependence on the water source is eliminated, an operation test can be conducted off site, resources are saved, great convenience is brought, a heating performance parameter linear equation can be built according to data obtained by the heating test platform, the corresponding heating performance parameter linear equation is matched according to actual heat load requirements of a field wellhead, and then on-site heating device selection, operation power and on-line operation modes can be guided to be optimized.
Detailed Description
In order to clearly illustrate the technical characteristics of the scheme, the scheme is explained below through a specific embodiment.
Referring to fig. 1-2, the first embodiment of the invention is realized by the following technical scheme that the method for evaluating the online operation performance of the distributed wellhead heating equipment is realized by the following steps that step S1, a distributed wellhead heating test platform is established, the wellhead heating test platform comprises a distributed heating system, a simulated heat load and a measurement and control system, the distributed heating system comprises two heating equipment which are connected through a pipeline and a plurality of valves, the connection of the two heating equipment can be switched into series connection or parallel connection through a switch combination of the control valves, the simulated heat load can be matched with the heat load of an actual wellhead, the measurement and control system can control the switch of the valves and the operation power of each heating equipment, the temperature and the flow of a heat exchange medium at different positions are collected through sensors, and the heating performance parameters of each operation mode of each working condition can be calculated according to the data collected by the sensors.
Step S2, controlling the on-line operation modes of two heating devices to be in series connection, respectively performing series connection mode test under three working conditions of simulating full load, 50% load and minimum load of the thermal load, and performing linear fitting by using a least square method to obtain a heating performance parameter linear equation during series connection operation under each working condition;
Step S3, controlling the on-line operation modes of the two heating devices to be parallel connection, respectively carrying out parallel connection mode test under three working conditions of simulating full load, 50% load and minimum load of the thermal load, and carrying out linear fitting by using a least square method to obtain a heating performance parameter linear equation during parallel connection operation under each working condition;
and S4, according to different heating performance parameter linear equations and combining the requirements of an actual wellhead, heating equipment and an operation mode which are matched with the actual wellhead can be determined, and efficient operation of the heating equipment is ensured.
In general, the series operation is suitable for the condition of higher heat load demand, through the series operation, heat exchange media can be subjected to cascade heating to reach the required high temperature, when the heat exchange media enter a distributed heating system to ensure that the temperature is unchanged, the temperature after different heat exchange media are heated can be set to linearly change the whole energy consumption, the parallel operation is more suitable for the condition of higher heat load demand and higher flow, when two heating devices are connected in parallel, the two heating devices can be regarded as the distribution of the heat load, one heating device is set to provide 50% of the heat load, the power ratio of the heating device is changed according to the obtained linear equation and the condition of the on-site heat load, the whole energy consumption can be linearly changed, a plurality of schemes meeting the actual wellhead heating demand can be obtained based on a distributed wellhead heating test platform, the heating scheme with highest heating efficiency can be determined based on the linear equation of the heating performance parameters, and the accurate and objective basis is provided for the on-site wellhead heating device, and the method has higher guiding significance.
The simulated heat load comprises a water tank 10 and a water tower 11 connected in series with the water inlet end of the water tank 10, a heat exchange medium is arranged in the water tank 10, the heat exchange medium continuously flows into the distributed heating system after being pressurized by a water pump 12, and the heated heat exchange medium flows into the water tower 11 and flows back to the water tank 10 again after heat dissipation, so that circulation is formed. The pressure of the water pump 12 is regulated to control the flow rate of the heat exchange medium, the water quantity in the water tank 10 is regulated, and the like, so that the magnitude of the simulated heat load can be regulated.
The two heating devices are any two of three cleaning heating devices of PTC, solar energy and double-source heat pump.
Each heating equipment in the distributed heating system is connected into a pipeline through a universal interface, and the heating equipment can be quickly replaced through the universal interface, so that the test requirement is met.
The step S2 specifically comprises the following steps:
S21, in a series mode, taking the temperature of the heat exchange medium heated by the distributed heating system as a variable, wherein an output value corresponding to the variable is a heating performance parameter of the distributed wellhead heating test platform;
Step S22, testing the same value point of the variable in a plurality of time periods, wherein each time period can acquire a corresponding actually measured value of the heating performance parameter, preprocessing all actually measured values of the heating performance parameter, removing outliers in the actually measured values, and obtaining the corresponding actually measured value according to a formulaWherein Xi is the actual value of the measurement,The average value of the measured values is taken as an outlier, Yi >0.2 is selected as an output value corresponding to a value point of the current variable, and the average value of the residual measured values of the heating performance parameters is taken as an output value corresponding to the value point of the current variable;
Step S23, gradually increasing the value point of the variable, and obtaining a series of corresponding output values through step S22;
step S24, performing linear fitting by using a least square method to obtain a corresponding heating performance parameter linear equation, which is expressed as y=ax+b, where x is a variable, y is a heating performance parameter, and A, B is a pending parameter;
Wherein, X= [ X1,…,xn ], the element in X is the value point of the variable, Y= [ Y1,…,yn ], the element in Y is the output value corresponding to X;
And S25, respectively performing series mode test under three working conditions of simulating full load, 50% load and minimum load of the thermal load, and obtaining a heating performance parameter linear equation of each working condition through steps S22-S24.
The step S3 specifically comprises the following steps:
in the parallel mode, the output power ratio of the two heating devices is used as a variable, the output corresponding to the variable is the heating performance parameter of the distributed wellhead heating test platform, and the output power of the corresponding heating device can be measured by the power meter 42.
Step S32, testing the same value point of the variable in a plurality of time periods, wherein each time period can acquire a corresponding actually measured value of the heating performance parameter, preprocessing all actually measured values of the heating performance parameter, removing outliers in the actually measured values, and obtaining the value according to a formulaWherein Xi is the actual value of the measurement,The average value of the measured values is taken as an outlier, Yi >0.2 is selected as an output value corresponding to a value point of the current variable, and the average value of the residual measured values of the heating performance parameters is taken as an output value corresponding to the value point of the current variable;
step S33, gradually increasing the value point of the variable, and obtaining a series of corresponding output values through step S32;
Step S34, performing linear fitting by using a least square method to obtain a corresponding heating performance parameter linear equation, which is expressed as y=ax+b, where x is a variable, y is a heating performance parameter, and A, B is a pending parameter;
Wherein, X= [ X1,…,xn ], the element in X is the value point of the variable, Y= [ Y1,…,yn ], the element in Y is the output value corresponding to X;
And S35, respectively performing parallel mode test under three working conditions of simulating full load, 50% load and minimum load of the thermal load, and obtaining a heating performance parameter linear equation of each working condition through steps S32-S34.
The heating performance parameter is the heat efficiency or energy efficiency ratio of the current distributed heating system in the current working mode. The thermal efficiency and the energy efficiency ratio can be calculated through data acquired by the sensor, and the calculation result can be calculated and displayed in real time through the measurement and control system.
In the second embodiment, based on the first embodiment, the distributed heating system further includes heat storage devices capable of simulating two ends of a heat load in parallel, valves are arranged at the inlet and outlet ends of the heat storage devices, and the measurement and control system can control a heat exchange medium to enter the heat storage devices for heat exchange.
The heat storage unit is capable of heating for wellhead simulation heat load;
the heat storage unit is arranged to save energy and reduce consumption by using peak-valley electricity, and is heated when the peak-valley electricity is generated and is used for releasing heat when the peak-valley electricity is generated.
In the third embodiment, based on the first embodiment, the measurement and control system includes a PLC 50, where the PLC 50 can control the opening and closing of the valve and collect the data of each sensor. As shown in fig. 1, the switching of the on-line operation mode of the heating apparatus is achieved by controlling the valve switch combination through the PLC 50. The series mode is that after the heat exchange medium in the water tank 10 is pressurized by the water pump 12, the valve I31, the valve III 33, the valve IV 34 and the valve V35 are opened, the valve II 32 is closed, the series connection of the heating equipment I21 and the heating equipment II 22 is realized by a pipe network, wherein the water outlet of the heating equipment I21 is the water inlet of the heating equipment II 22, the hierarchical heating is realized, the heated heat exchange medium is circulated to the water tower 11 for heat dissipation, and then flows back to the water tank 10; the parallel mode comprises the steps of pressurizing a heat exchange medium in the water tank 10 by a water pump 12, opening a valve I31, a valve II 32, a valve IV 34 and a valve V35, closing a valve III 33, realizing parallel connection of a heating device I21 and a heating device II 22 by a pipe network, heating the heating device I21 and the heating device II 22 simultaneously, realizing high-flow heat exchange requirement, enabling the heated heat exchange medium to circulate to a water tower 11 for heat dissipation, and then flowing back to the water tank 10, wherein the heating device I21 and the heating device II 22 are respectively provided with a power meter 42, and temperature sensors 41 are respectively arranged at an inlet end and an outlet end of the heating device I21, an inlet end and an outlet end of the heating device II 22, the water tower 11, the water tank 10, a distributed heating system and the water tower 11;
In the description of the invention, it should be understood that the terms "center," "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships that are based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "configured" are to be interpreted broadly, and may, for example, be fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediary, or communicate between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art in a specific case.
The technical features of the present invention that are not described in the present invention may be implemented by or using the prior art, and are not described in detail herein, but the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, but is also intended to be within the scope of the present invention by those skilled in the art.