CN112392459A - Method and device for determining production characteristics of electric submersible plunger pump well - Google Patents
Method and device for determining production characteristics of electric submersible plunger pump well Download PDFInfo
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Abstract
The application discloses a method and a device for determining production characteristics of an electric submersible plunger pump well, wherein the method comprises the following steps: acquiring a pump fixed attribute parameter, an oil pipe fixed attribute parameter and a fluid attribute parameter; changing pump outlet and inlet pressure differences, and acquiring pump variable attribute parameters respectively corresponding to different pump outlet and inlet pressure differences; and determining the production characteristics of the electric submersible plunger pump well according to the pump outlet and inlet differential pressure, the pump fixed attribute parameter, the pump variable attribute parameter, the oil pipe fixed attribute parameter and the fluid attribute parameter. The method and the device can solve the problem that the flow required to be executed when the electric submersible plunger pump well is optimally designed is complex due to uncertain production characteristics.
Description
Technical Field
The application relates to the technical field of oil field mechanical oil extraction, in particular to a method and a device for determining production characteristics of an electric submersible plunger pump well.
Background
The oil extraction by utilizing the electric submersible plunger pump oil pumping system is a novel rodless lifting mechanical oil extraction mode, is suitable for low-yield oil wells in the middle and later periods of oil field development, and has good development prospect. The oil pumping system of the electric submersible plunger pump mainly comprises three parts, namely a linear motor, a matched oil well pump and a variable frequency control system, the largest difference between the oil pumping system and the sucker rod pump is that no sucker rod exists, the ground variable frequency control system is connected with an underground linear motor through a special power cable, a stator coil of the underground linear motor generates an alternating magnetic field under the action of pulsating alternating current, and a permanent magnet rotor and a plunger are periodically driven to do up-and-down reciprocating motion, so that the oil is lifted to the ground.
The driving mode of an oil pumping system of the electric submersible plunger pump is changed from the ground to the underground, no movable equipment is arranged on the ground, the equipment management workload is reduced, and the labor intensity of workers is reduced; the rodless lifting overcomes the pump detection operation caused by the rod system fault, and eliminates the energy consumption required by lifting the rod column. However, the production characteristics of the current electric submersible plunger pump well for oil extraction by using the electric submersible plunger pump oil pumping system are not determined like the electric submersible pump well and a screw pump well, which increases the complexity of the electric submersible plunger pump well in the optimization design of equipment optimization, parameter optimization and the like.
Disclosure of Invention
The embodiment of the application provides a method for determining the production characteristics of an electric submersible plunger pump well, which is used for solving the problem that the flow required to be executed when the electric submersible plunger pump well is optimally designed is complex due to the fact that the production characteristics are not determined, and comprises the following steps:
acquiring a pump fixed attribute parameter, an oil pipe fixed attribute parameter and a fluid attribute parameter; changing pump outlet and inlet pressure differences, and acquiring pump variable attribute parameters respectively corresponding to different pump outlet and inlet pressure differences; and determining the production characteristics of the electric submersible plunger pump well according to the pump outlet and inlet differential pressure, the pump fixed attribute parameter, the pump variable attribute parameter, the oil pipe fixed attribute parameter and the fluid attribute parameter.
The embodiment of the application further provides a device for determining the production characteristics of the electric submersible plunger pump well, which is used for solving the problem that the flow of the electric submersible plunger pump well which needs to be executed when the production characteristics are not determined is complex, and the device comprises:
the acquisition module is used for acquiring the fixed attribute parameters of the pump, the fixed attribute parameters of the oil pipe and the fluid attribute parameters; the acquisition module is used for changing the pressure difference of the pump outlet and the pump inlet and acquiring the variable attribute parameters of the pump corresponding to the pressure difference of the pump outlet and the pump inlet respectively; and the determining module is used for determining the production characteristics of the electric submersible plunger pump well according to the pump outlet and inlet pressure difference, the pump fixed attribute parameter, the pump variable attribute parameter, the oil pipe fixed attribute parameter and the fluid attribute parameter which are acquired by the acquiring module and the acquiring module.
In the embodiment of the application, the pump variable attribute parameters corresponding to different pump outlet and inlet pressure differences are obtained by changing the pump outlet and inlet pressure differences, and the production characteristics of the electric submersible plunger pump well corresponding to the pump outlet and inlet pressure differences are determined by combining the pump fixed attribute parameters, the fluid attribute parameters and the oil pipe fixed attribute parameters, so that the equipment optimization, parameter optimization and other optimization designs of the electric submersible plunger pump well can be carried out by utilizing the production characteristics of the electric submersible plunger pump well in the subsequent production process, and the complexity of the optimization design process is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a flow chart of a method for determining production characteristics of an electric submersible plunger pump well according to an embodiment of the present application;
FIG. 2 is a displacement map provided by an embodiment of the present application;
FIG. 3 is a power composition diagram provided by an embodiment of the present application;
FIG. 4 is a schematic illustration of an electrical submersible plunger pump well production profile provided by an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electric submersible plunger pump well production characteristic determination device provided in an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present application are provided herein to explain the present application and not to limit the present application.
The embodiment of the application provides a method for determining the production characteristics of an electric submersible plunger pump, as shown in fig. 1, the method comprises steps 101 to 103:
The fixed attribute parameters of the pump comprise plunger stroke, plunger cross-sectional area, plunger eccentricity, plunger length, clearance ratio, pump diameter, pump clearance, pump theoretical displacement, pump valve seat hole area and resistance coefficient of fluid flowing through a valve ball.
It should be noted that the clearance ratio is the ratio of the clearance volume to the volume displaced by the piston on the pump.
The oil pipe fixed attribute parameters comprise the total length of the oil pipe column, the elastic modulus of the material of the oil pipe column and the cross-sectional area of the pipe wall of the oil pipe column.
The fluid property parameters include density of the fluid, kinematic viscosity of the fluid, volume factor of the fluid, and viscosity of the fluid.
And 102, changing pump outlet and inlet pressure differences, and collecting pump variable attribute parameters respectively corresponding to the different pump outlet and inlet pressure differences.
The variable attribute parameters of the pump comprise the gas-liquid ratio in the pump, the displacement entering a pump cylinder, the average speed of the plunger and the stroke frequency of the plunger.
In the embodiment of the application, the pump outlet and inlet pressure differences correspond to the pump variable attribute parameters one by one, a group of pump variable attribute parameters corresponding to the pump outlet and inlet pressure differences can be obtained by changing the pump outlet and inlet pressure differences for once, and a plurality of groups of pump variable attribute parameters can be obtained by changing the pump outlet and inlet pressure differences for a plurality of times.
And 103, determining the production characteristics of the electric submersible plunger pump well according to the pump outlet and inlet differential pressure, the pump fixed attribute parameter, the pump variable attribute parameter, the oil pipe fixed attribute parameter and the fluid attribute parameter.
The production characteristics are generally reflected by curves, and therefore, the production characteristics of the electric submersible plunger pump well are determined according to the pump-out-inlet differential pressure, the pump fixed attribute parameter, the pump variable attribute parameter, the tubing fixed attribute parameter and the fluid attribute parameter, and comprise: and determining a production characteristic curve of the electric submersible plunger pump well according to the pump outlet and inlet differential pressure, the pump fixed attribute parameter, the pump variable attribute parameter, the oil pipe fixed attribute parameter and the fluid attribute parameter.
The production profile includes a first profile relating pump outlet inlet differential pressure to actual displacement of the pump, a second profile relating pump outlet differential pressure to motor output power, and a third profile relating pump outlet differential pressure to overall efficiency of the electric submersible ram well system. The determination of the first, second and third curves from the pump outlet inlet differential pressure, the pump fixed property parameter, the pump variable property parameter, the tubing fixed property parameter and the fluid property parameter, respectively, will now be described.
1. A first curve is determined.
The first curve relating actual displacement of the pump to pump outlet-inlet pressure differential is one of the more important production characteristics. Given each set of pump parameters, such as pump diameter, plunger stroke, stroke of the plunger, etc., the theoretical displacement of the pump can be determined using the prior art calculation formulas for conventional plunger pumps. The actual displacement of the pump is generally smaller than the theoretical displacement, the ratio of the actual displacement to the theoretical displacement is called pump efficiency, the main influence factors of the pump efficiency are elastic deformation of a tubing string, the difference of the volume of fluid underground and the ground, the filling degree of the fluid in a pump cylinder, the liquid leakage between plunger bushes and the like, and the pump efficiency can be calculated by the following formula:
according to
Calculating the stroke loss e caused by the elastic expansion of the oil pipet(ii) a According to Sp＝S-etCalculating the effective stroke S of the plungerp(ii) a According to
Calculating the stroke loss influence coefficient etaS。
According to
Calculating the degree of pump filling etaC。
According to
Calculating the leakage q between the plunger bushingsloss(ii) a According to
Calculating pump loss influence coefficient etaq。
According to
Calculating the influence coefficient eta of the fluid volume compression effectB。
According to ηV＝ηSηCηqηBCalculating the pumping efficiency etaV。
According to Q ═ QtηVCalculating and pumping outThe actual displacement Q corresponding to the inlet pressure differential ap.
Wherein f ispIs the plunger cross-sectional area, in m2(ii) a E is the elastic modulus of the tubing string material, and the unit is Pa; f. ofiIs the cross-sectional area of the tubing string wall in m2(ii) a L is the total length of the tubing string and is m; s is the plunger stroke in m; k is a clearance ratio; r is the gas-liquid ratio in the pump; d is the pump diameter and the unit is m; h is the pump clearance in m; epsilon is the eccentricity of the plunger; v kinematic viscosity of fluid in m2S; density of rho fluid in kg/m3(ii) a length of the plunger, in m; u is the average speed of the plunger and has the unit of m/s; qpump_inIs the displacement into the pump barrel in m3S; b is the volume coefficient of the fluid; qtIs the theoretical displacement of the pump.
According to the method for calculating the actual displacement of the pump, the pressure difference of the pump outlet and the pump inlet is changed, the actual displacement of different pumps can be obtained, and a first curve is determined according to the corresponding relation between the pressure difference delta P of the pump outlet and the pump inlet and the actual displacement Q.
2. A second curve is determined.
After the relation between the actual displacement of the pump and the pressure difference of the pump outlet and the pump inlet is determined, the useful power and the input power of the electric submersible plunger pump system can be further calculated according to the pressure difference of the pump outlet and the actual displacement. The output power of the downhole linear motor is the input power of the system. The method for calculating the motor output power of the underground linear motor comprises the following steps:
according to NeCalculating the effective power N of the motore。
According to
Calculating the hydraulic loss power NLoss_H。
According to NLoss_V＝ΔPqlossCalculating the volumetric loss power NLoss_V。
According to
Computing machineLoss power NLoss_M。
According to Nout＝Ne+NLoss_H+NLoss_V+NLoss_MCalculating the output power N of the motorout。
Where ζ is the coefficient of resistance to fluid flow through the valve ball; a is the area of the valve seat hole of the pump valve and the unit is m2(ii) a n is stroke number in min-1(ii) a μ is the viscosity of the fluid in Pa · s.
According to the method for calculating the output power of the motor, the pressure difference of the pump outlet and the pump inlet is changed to obtain different output powers of the motor, and the pressure difference delta P of the pump outlet and the pump inlet and the output power N of the motor are calculated according to the pressure difference delta P of the pump outlet and the pump inlet and the output power N of the motoroutDetermining a second curve according to the corresponding relation.
3. A third curve is determined.
The method for calculating the total efficiency of the electric submersible plunger pump well system comprises the following steps:
according to
And calculating the total efficiency eta of the electric submersible plunger pump well system.
According to the method for calculating the total efficiency of the electric submersible plunger pump well system, the pressure difference of the pump outlet and the pump inlet is changed, the total efficiency of the electric submersible plunger pump well system corresponding to the pressure difference of each pump outlet and the pump inlet can be obtained, and a third curve is determined according to the corresponding relation between the pressure difference delta P of different pump outlets and inlets and the total efficiency eta of the electric submersible plunger pump well system.
In the embodiment of the application, the pump variable attribute parameters corresponding to different pump outlet and inlet pressure differences are obtained by changing the pump outlet and inlet pressure differences, and the production characteristics of the electric submersible plunger pump well corresponding to the pump outlet and inlet pressure differences are determined by combining the pump fixed attribute parameters, the fluid attribute parameters and the oil pipe fixed attribute parameters, so that the equipment optimization, parameter optimization and other optimization designs of the electric submersible plunger pump well can be carried out by utilizing the production characteristics of the electric submersible plunger pump well in the subsequent production process, and the complexity of the optimization design process is reduced.
The production characteristic curve of the rodless electric submersible plunger pump well can be determined by the method. The following exemplary sets forth some of the parametersAnd introducing the drawn first curve, the second curve and the third curve based on the partial parameters. The basic parameters of the electric submersible plunger pump well production system are as follows: the well bore is vertical, the well depth is 1500 meters (m), the pump setting depth is 1200m, the inner diameter of the oil pipe is 0.062m, the outer diameter of the oil pipe is 0.073m, the oil pipe is anchored, the pump clearance is 0.1 millimeter (mm), the pump diameter is 44mm, the stroke is 4.5m, and the stroke time is 4min-1The pressure of a pump suction inlet is 3MPa, and the production gas-oil ratio is 20m3/m3The water content is 0, etc.
Assuming that the viscosity of the crude oil is 5mPa · s, the displacement composition diagram shown in fig. 2, in which the displacement loss due to the degree of filling of the fluid in the pump cylinder, the displacement loss due to the fluid loss between the plunger bushes, the displacement loss due to the difference in the underground and bottom surface volumes of the fluid, and the actual displacement are shown, is calculated to be 0 using the above method.
Assuming that the viscosity of the crude oil at the time of calculation is 55mPa · s, a power composition map can be calculated similarly, as shown in fig. 3, in which the value of mechanical loss power is small.
According to the ratio of the effective power to the output power of the motor, the total efficiency of the electric submersible plunger pump well system can be calculated, and a third curve related to the total efficiency of the electric submersible plunger pump system and the pressure difference of the pump outlet and the pump inlet is obtained.
Q to delta P, NoutAnd drawing the curves of delta P and eta to delta P on the same graph to obtain three production characteristic curves of the rodless electric submersible plunger pump well, as shown in FIG. 4.
The embodiment of the present application further provides an apparatus for determining production characteristics of an electric submersible plunger pump well, as shown in fig. 5, the apparatus 500 includes an obtaining module 501, an acquiring module 502, and a determining module 503:
the obtaining module 501 is configured to obtain a pump fixed attribute parameter, an oil pipe fixed attribute parameter, and a fluid attribute parameter.
And the acquisition module 502 is used for changing the pressure difference of the pump outlet and the pump inlet and acquiring the variable attribute parameters of the pump corresponding to the pressure difference of the pump outlet and the pump inlet respectively.
And the determining module 503 is used for determining the production characteristics of the electric submersible plunger pump well according to the pump outlet/inlet pressure difference, the pump fixed attribute parameter, the pump variable attribute parameter, the oil pipe fixed attribute parameter and the fluid attribute parameter which are acquired by the acquiring module 501 and the acquiring module 502.
In an implementation manner of the embodiment of the present application, the determining module 503 is configured to:
and determining a production characteristic curve of the electric submersible plunger pump well according to the pump outlet and inlet differential pressure, the pump fixed attribute parameter, the pump variable attribute parameter, the oil pipe fixed attribute parameter and the fluid attribute parameter.
In one implementation of the embodiments of the present application, the pump fixed attribute parameters include plunger stroke, plunger cross-sectional area, plunger eccentricity, plunger length, clearance ratio, pump diameter, pump clearance, pump theoretical displacement, pump valve seating area, and coefficient of resistance of fluid flow through the valve ball. The oil pipe fixed attribute parameters comprise the total length of the oil pipe column, the elastic modulus of the material of the oil pipe column and the cross-sectional area of the pipe wall of the oil pipe column. The fluid property parameters include density of the fluid, kinematic viscosity of the fluid, volume factor of the fluid, and viscosity of the fluid. The pump variable attribute parameters include the gas-liquid ratio within the pump, the displacement into the cylinder, the average speed of the plunger, and the number of strokes of the plunger.
In one implementation of an embodiment of the present application, the production profile of the electric submersible plunger pump well includes a first profile relating pump outlet/inlet differential pressure to actual displacement of the pump, and the determining module 503 is configured to:
according to
Calculating the stroke loss e caused by the elastic expansion of the oil pipet(ii) a According to Sp＝S-etCalculating the effective stroke S of the plungerp(ii) a According to
Calculating the stroke loss influence coefficient etaS；
According to
Calculating the degree of pump filling etaC；
According to
Calculating the leakage q between the plunger bushingsloss(ii) a According to
Calculating pump loss influence coefficient etaq；
According to
Calculating the influence coefficient eta of the fluid volume compression effectB；
According to ηV＝ηSηCηqηBCalculating the pumping efficiency etaV；
According to Q ═ QtηVCalculating the actual displacement Q corresponding to the pump outlet and inlet pressure difference delta P;
determining a first curve according to the corresponding relation between the pressure difference delta P of the pump outlet and the inlet and the actual displacement Q;
wherein f ispIs the plunger cross-sectional area, in m2(ii) a E is the elastic modulus of the tubing string material, and the unit is Pa; f. ofiIs the cross-sectional area of the tubing string wall in m2(ii) a L is the total length of the tubing string and is m; s is the plunger stroke in m; k is a clearance ratio; r is the gas-liquid ratio in the pump; d is the pump diameter and the unit is m; h is the pump clearance in m; epsilon is the eccentricity of the plunger; v kinematic viscosity of fluid in m2S; density of rho fluid in kg/m3(ii) a length of the plunger, in m; u is the average speed of the plunger and has the unit of m/s; qpump_inIs the displacement into the pump barrel in m3S; b is the volume coefficient of the fluid; qtIs the theoretical displacement of the pump.
In one implementation of the embodiments of the present application, the production characteristic curve of the electric submersible plunger pump well includes a second curve relating pump-out-inlet differential pressure to motor output power, and the determining module 503 is configured to:
according to NeDelta PQ meterCalculating the effective power N of the motore；
According to
Calculating the hydraulic loss power NLoss_H；
According to NLoss_V＝ΔPqlossCalculating the volumetric loss power NLoss_V；
According to
Calculating mechanical loss power NLoss_M；
According to Nout＝Ne+NLoss_H+NLoss_V+NLoss_MCalculating the output power N of the motorout；
According to the pressure difference delta P of the pump outlet and the inlet and the output power N of the motoroutDetermining a second curve according to the corresponding relation;
where ζ is the coefficient of resistance to fluid flow through the valve ball; a is the area of the valve seat hole of the pump valve and the unit is m2(ii) a n is the number of strokes of the plunger in min-1(ii) a μ is the viscosity of the fluid in Pa · s.
In one implementation of the embodiment of the present application, the production characteristic curve of the electric submersible plunger pump well includes a third curve relating pump-out-inlet pressure difference to overall efficiency of the electric submersible plunger pump well system, and the determining module 503 is configured to:
according to
Calculating the total efficiency eta of the electric submersible plunger pump well system;
and determining a third curve according to the corresponding relation between the pressure difference delta P of the pump outlet and the inlet of different pumps and the total efficiency eta of the electric submersible plunger pump well system.
In the embodiment of the application, the pump variable attribute parameters corresponding to different pump outlet and inlet pressure differences are obtained by changing the pump outlet and inlet pressure differences, and the production characteristics of the electric submersible plunger pump well corresponding to the pump outlet and inlet pressure differences are determined by combining the pump fixed attribute parameters, the fluid attribute parameters and the oil pipe fixed attribute parameters, so that the equipment optimization, parameter optimization and other optimization designs of the electric submersible plunger pump well can be carried out by utilizing the production characteristics of the electric submersible plunger pump well in the subsequent production process, and the complexity of the optimization design process is reduced.
The embodiment of the present application further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, any one of the methods described in step 101 to step 103 and various implementations thereof is implemented.
The embodiment of the present application further provides a computer-readable storage medium, where a computer program for executing any one of the methods described in steps 101 to 103 and various implementation manners thereof is stored in the computer-readable storage medium.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are further described in detail for the purpose of illustrating the invention, and it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (14)
1. A method for determining production characteristics of an electric submersible plunger pump well, the method comprising:
acquiring a pump fixed attribute parameter, an oil pipe fixed attribute parameter and a fluid attribute parameter;
changing pump outlet and inlet pressure differences, and acquiring pump variable attribute parameters respectively corresponding to different pump outlet and inlet pressure differences;
and determining the production characteristics of the electric submersible plunger pump well according to the pump outlet and inlet differential pressure, the pump fixed attribute parameter, the pump variable attribute parameter, the oil pipe fixed attribute parameter and the fluid attribute parameter.
2. The method of claim 1, wherein determining production characteristics of the electrical submersible plunger pump well from the pump outlet and inlet differential pressure, the pump fixed property parameter, the pump variable property parameter, the tubing fixed property parameter, and the fluid property parameter comprises:
and determining a production characteristic curve of the electric submersible plunger pump well according to the pump outlet and inlet differential pressure, the pump fixed attribute parameter, the pump variable attribute parameter, the oil pipe fixed attribute parameter and the fluid attribute parameter.
3. The method of claim 2,
the fixed attribute parameters of the pump comprise plunger stroke, plunger cross-sectional area, plunger eccentricity, plunger length, clearance ratio, pump diameter, pump clearance, pump theoretical displacement, pump valve seat hole area and resistance coefficient of fluid flowing through a valve ball;
the oil pipe fixed attribute parameters comprise the total length of the oil pipe column, the elastic modulus of the material of the oil pipe column and the cross-sectional area of the wall of the oil pipe column;
the fluid property parameters comprise the density of the fluid, the kinematic viscosity of the fluid, the volume coefficient of the fluid and the viscosity of the fluid;
the pump variable attribute parameters include a gas-to-liquid ratio within the pump, a displacement into the pump barrel, an average speed of the plunger, and a number of strokes of the plunger.
4. The method of claim 3, wherein the production profile for the electric submersible plunger pump well comprises a first profile relating pump outlet and inlet differential pressure to actual displacement of the pump, the first profile determined from the pump outlet and inlet differential pressure, the pump fixed property parameter, the pump variable property parameter, the tubing fixed property parameter, and the fluid property parameter, comprising:
according to
Calculating the stroke loss e caused by the elastic expansion of the oil pipet(ii) a According to Sp＝S-etCalculating the effective stroke S of the plungerp(ii) a According to
Calculating the stroke loss influence coefficient etaS；
According to
Calculating the degree of pump filling etaC；
According to
Calculating the leakage q between the plunger bushingsloss(ii) a According to
Calculating pump loss influence coefficient etaq；
According to
Calculating the influence coefficient eta of the fluid volume compression effectB；
According to ηV＝ηSηCηqηBCalculating the pumping efficiency etaV；
According to Q ═ QtηVCalculating the actual displacement Q corresponding to the pump outlet and inlet pressure difference delta P;
determining a first curve according to the corresponding relation between the pressure difference delta P of the pump outlet and the inlet and the actual displacement Q;
wherein f ispIs the plunger cross-sectional area, in m2(ii) a E is the elastic modulus of the tubing string material, and the unit is Pa; f. ofiIs the cross-sectional area of the tubing string wall in m2(ii) a L is the total length of the tubing string and is m; s is the plunger stroke in m; k is a clearance ratio; r is the gas-liquid ratio in the pump; d is the pump diameter and the unit is m; h is the pump clearance in m; epsilon is the eccentricity of the plunger; v kinematic viscosity of fluid in m2S; density of rho fluid in kg/m3(ii) a length of the plunger, in m; u is the average speed of the plunger and has the unit of m/s; qpump_inIs the displacement into the pump barrel in m3S; b is the volume coefficient of the fluid; qtIs the theoretical displacement of the pump.
5. The method of claim 4, wherein the production profile for the electric submersible plunger pump well comprises a second profile relating pump outlet and inlet differential pressure to motor output power, the second profile determined from pump outlet and inlet differential pressure, pump fixed property parameter, pump variable property parameter, tubing fixed property parameter, and fluid property parameter comprising:
according to NeCalculating the effective power N of the motore；
According to
Calculating the hydraulic loss power NLoss_H；
According to NLoss_V＝ΔPqlossCalculating the volumetric loss power NLoss_V；
According to
Calculating mechanical loss power NLoss_M；
According to Nout＝Ne+NLoss_H+NLoss_V+NLoss_MCalculating the output power N of the motorout；
According to the pressure difference delta P of the pump outlet and the inlet and the output power N of the motoroutDetermining a second curve according to the corresponding relation;
where ζ is the coefficient of resistance to fluid flow through the valve ball; a is the area of the valve seat hole of the pump valve and the unit is m2(ii) a n is the number of strokes of the plunger in min-1(ii) a μ is the viscosity of the fluid in Pa · s.
6. The method of claim 5, wherein the production profile for the electric submersible plunger pump well comprises a third profile relating pump outlet and inlet differential pressure to overall efficiency of the electric submersible plunger pump well system, the third profile determined from pump outlet and inlet differential pressure, pump fixed property parameter, pump variable property parameter, tubing fixed property parameter, and fluid property parameter comprising:
according to
Calculating the total efficiency eta of the electric submersible plunger pump well system;
and determining a third curve according to the corresponding relation between the pressure difference delta P of the pump outlet and the inlet of different pumps and the total efficiency eta of the electric submersible plunger pump well system.
7. An electrical submersible plunger pump well production characteristic determining apparatus, the apparatus comprising:
the acquisition module is used for acquiring the fixed attribute parameters of the pump, the fixed attribute parameters of the oil pipe and the fluid attribute parameters;
the acquisition module is used for changing the pressure difference of the pump outlet and the pump inlet and acquiring the variable attribute parameters of the pump corresponding to the pressure difference of the pump outlet and the pump inlet respectively;
and the determining module is used for determining the production characteristics of the electric submersible plunger pump well according to the pump outlet and inlet pressure difference, the pump fixed attribute parameter, the pump variable attribute parameter, the oil pipe fixed attribute parameter and the fluid attribute parameter which are acquired by the acquiring module and the acquiring module.
8. The apparatus of claim 7, wherein the determining module is configured to:
and determining a production characteristic curve of the electric submersible plunger pump well according to the pump outlet and inlet differential pressure, the pump fixed attribute parameter, the pump variable attribute parameter, the oil pipe fixed attribute parameter and the fluid attribute parameter.
9. The apparatus of claim 8,
the fixed attribute parameters of the pump comprise plunger stroke, plunger cross-sectional area, plunger eccentricity, plunger length, clearance ratio, pump diameter, pump clearance, pump theoretical displacement, pump valve seat hole area and resistance coefficient of fluid flowing through a valve ball;
the oil pipe fixed attribute parameters comprise the total length of the oil pipe column, the elastic modulus of the material of the oil pipe column and the cross-sectional area of the wall of the oil pipe column;
the fluid property parameters comprise the density of the fluid, the kinematic viscosity of the fluid, the volume coefficient of the fluid and the viscosity of the fluid;
the pump variable attribute parameters include a gas-to-liquid ratio within the pump, a displacement into the pump barrel, an average speed of the plunger, and a number of strokes of the plunger.
10. The apparatus of claim 9, wherein the production profile for the electric submersible plunger pump well comprises a first profile relating pump outlet inlet differential pressure to actual displacement of the pump, the determination module configured to:
according to
Calculating the stroke loss e caused by the elastic expansion of the oil pipet(ii) a According to Sp＝S-etCalculating the effective stroke S of the plungerp(ii) a According to
Calculating the stroke loss influence coefficient etaS；
According to
Calculating the degree of pump filling etaC；
According to
Calculating the leakage q between the plunger bushingsloss(ii) a According to
Calculating pump loss influence coefficient etaq；
According to
Calculating the influence coefficient eta of the fluid volume compression effectB；
According to ηV＝ηSηCηqηBCalculating the pumping efficiency etaV；
According to Q ═ QtηVCalculating the actual displacement Q corresponding to the pump outlet and inlet pressure difference delta P;
determining a first curve according to the corresponding relation between the pressure difference delta P of the pump outlet and the inlet and the actual displacement Q;
wherein f ispIs the plunger cross-sectional area, in m2(ii) a E is the elastic modulus of the tubing string material, and the unit is Pa; f. ofiIs the cross-sectional area of the tubing string wall in m2(ii) a L is the total length of the tubing string and is m; s is the plunger stroke in m; k is a clearance ratio; r is the gas-liquid ratio in the pump; d is the pump diameter and the unit is m; h is the pump clearance in m; epsilon is the eccentricity of the plunger; v kinematic viscosity of fluid in m2S; density of rho fluid in kg/m3(ii) a length of the plunger, in m; u is the average speed of the plunger and has the unit of m/s; qpump_inIs the displacement into the pump barrel in m3S; b is the volume coefficient of the fluid; qtIs the theoretical displacement of the pump.
11. The apparatus of claim 10, wherein the production profile for the electric submersible plunger pump well comprises a second profile relating pump out inlet differential pressure to motor output power, the determining module configured to:
according to NeCalculating the effective power N of the motore；
According to
Calculating the hydraulic loss power NLoss_H；
According to NLoss_V＝ΔPqlossCalculating the volumetric loss power NLoss_V；
According to
Calculating mechanical loss power NLoss_M；
According to Nout＝Ne+NLoss_H+NLoss_V+NLoss_MCalculating the output power N of the motorout；
According to the pressure difference delta P of the pump outlet and the inlet and the output power N of the motoroutDetermining a second curve according to the corresponding relation;
where ζ is the coefficient of resistance to fluid flow through the valve ball; a is the area of the valve seat hole of the pump valve and the unit is m2(ii) a n is the number of strokes of the plunger in min-1(ii) a μ is the viscosity of the fluid in Pa · s.
12. The apparatus of claim 11, wherein the production profile for the electric submersible plunger pump well comprises a third profile relating pump out inlet differential pressure to overall efficiency of the electric submersible plunger pump well system, the determination module configured to:
according to
Calculating the total efficiency eta of the electric submersible plunger pump well system;
and determining a third curve according to the corresponding relation between the pressure difference delta P of the pump outlet and the inlet of different pumps and the total efficiency eta of the electric submersible plunger pump well system.
13. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 6 when executing the computer program.
14. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 6.
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