CN114718527B - Sinking pressure control method and device, computer equipment and storage medium - Google Patents
Sinking pressure control method and device, computer equipment and storage medium Download PDFInfo
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- CN114718527B CN114718527B CN202110013266.XA CN202110013266A CN114718527B CN 114718527 B CN114718527 B CN 114718527B CN 202110013266 A CN202110013266 A CN 202110013266A CN 114718527 B CN114718527 B CN 114718527B
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000006073 displacement reaction Methods 0.000 claims abstract description 103
- 239000012530 fluid Substances 0.000 claims abstract description 94
- 239000003129 oil well Substances 0.000 claims abstract description 86
- 230000001105 regulatory effect Effects 0.000 claims abstract description 14
- 230000001276 controlling effect Effects 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims description 92
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- 238000004590 computer program Methods 0.000 claims description 22
- 230000015654 memory Effects 0.000 claims description 18
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- 238000005086 pumping Methods 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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Abstract
The embodiment of the application discloses a sinking pressure control method, a sinking pressure control device, computer equipment and a storage medium, and belongs to the technical field of oil reservoir development. The method comprises the following steps: determining a sink pressure difference between the true sink pressure and the target sink pressure; determining the output displacement amplitude of the submersible screw pump required to be regulated to reach the target sinking pressure according to the inner diameter of the sleeve, the outer diameter of the oil pipe, the fluid density and the sinking pressure difference value; determining the operation frequency amplitude of the submersible screw pump required to be adjusted according to the current real operation frequency, the real output displacement and the output displacement amplitude of the submersible screw pump; and adjusting the operating frequency of the submersible screw pump according to the operating frequency amplitude. According to parameters such as the real sinking pressure, the inner diameter of the sleeve, the outer diameter of the oil pipe, the fluid density, the real operating frequency, the real output displacement and the like, the target operating frequency which is required to be regulated for the oil well to reach the expected sinking pressure is accurately determined, and the accuracy of controlling the sinking pressure of the oil well can be improved.
Description
Technical Field
The embodiment of the application relates to the technical field of oil reservoir development, in particular to a sinking pressure control method, a sinking pressure control device, computer equipment and a storage medium.
Background
The submersible screw pump well is an oil extraction mode in which a downhole motor is used for driving a screw pump to lift fluid to the ground. In the production process, the output displacement and the supply condition of the submersible screw pump and whether the submersible screw is normal can be judged according to the sinking pressure at the liquid suction port of the submersible screw pump. The sinking pressure refers to the pressure generated between the working fluid level in the annular space of the oil jacket and the liquid suction port of the submersible screw pump during oil extraction of the submersible screw pump. Too high sinking pressure can lead to production efficiency reduction, and too low sinking pressure can lead to well stopping, influencing production progress.
In the related art, in order to maintain the rationality of the sinking pressure when the submersible screw pump is in the well, the developer adjusts the rotation speed of the submersible screw pump according to experience to control the sinking pressure. But because the estimation is based on subjective experience, the accuracy of controlling the sinking pressure is low.
Disclosure of Invention
The embodiment of the application provides a sinking pressure control method, a sinking pressure control device, computer equipment and a storage medium, which can improve the accuracy of controlling the sinking pressure. The technical scheme is as follows:
In one aspect, there is provided a sinking pressure control method, the method comprising:
determining a sink pressure difference between the true sink pressure of the well and the target sink pressure;
determining the output displacement amplitude of the submersible screw pump which is required to be regulated by the oil well to reach the target sinking pressure according to the inner diameter of the casing in the oil well, the outer diameter of the oil pipe, the fluid density and the sinking pressure difference value;
determining the operation frequency amplitude of the submersible screw pump required to be adjusted according to the current real operation frequency, the real output displacement and the output displacement amplitude of the submersible screw pump;
And adjusting the operating frequency of the submersible screw pump according to the operating frequency amplitude.
Optionally, before determining the differential between the true sink pressure and the target sink pressure for the well, the method further comprises:
Acquiring current real oil production, oil production parameters, target oil production and real sinking pressure of the oil well, wherein the oil production parameters are used for representing the oil production capacity of the oil well under unit production pressure difference;
according to the actual oil production, the oil production parameters, the target oil production and the actual sinking pressure, the target sinking pressure is determined by adopting the following formula:
Wherein P m is the target sinking pressure, Q 1 is the actual oil yield, Q m is the target oil yield, J is the oil extraction parameter, and P 1 is the actual sinking pressure.
Optionally, before determining the differential between the true sink pressure and the target sink pressure for the well, the method further comprises:
Acquiring the fluid density, the working fluid level depth and the liquid suction port depth of the liquid suction port of the submersible screw pump in the oil well;
Determining the true sinking pressure at the liquid suction port according to the fluid density, the working fluid level depth and the liquid suction port depth by adopting the following formula:
P1＝(H1-H2)·ρ·g
Wherein P 1 is the true sinking pressure, H 1 is the liquid suction opening depth, H 2 is the working fluid level depth, ρ is the fluid density, and g is gravity acceleration.
Optionally, the determining the output displacement amplitude of the submersible screw pump required to be adjusted by the oil well to reach the target sinking pressure according to the internal diameter of the casing in the oil well, the external diameter of the oil pipe, the fluid density and the sinking pressure difference value comprises:
the output displacement amplitude is determined using the following equation:
wherein W t is the output displacement amplitude, P c is the sinking pressure difference, D is the casing inner diameter, D is the oil pipe outer diameter, ρ is the fluid density, pi is the circumference ratio, g is the gravitational acceleration.
Optionally, the determining the operation frequency amplitude of the submersible screw pump to be adjusted according to the current real operation frequency, the real output displacement and the output displacement amplitude of the submersible screw pump includes:
the operating frequency amplitude is determined using the following formula:
Wherein F t is the operating frequency amplitude, W t is the produced displacement amplitude, F 1 is the true operating frequency, and W 1 is the true produced displacement.
Optionally, the adjusting the operating frequency of the submersible screw pump according to the operating frequency amplitude includes:
If the real sinking pressure is larger than the target sinking pressure, the operation frequency of the submersible screw pump is adjusted upwards by the operation frequency amplitude;
and if the real sinking pressure is smaller than the target sinking pressure, the operating frequency of the submersible screw pump is adjusted downwards by the operating frequency amplitude.
Optionally, the adjusting the operating frequency of the submersible screw pump according to the operating frequency amplitude includes:
determining a target operating frequency of the submersible screw pump required by the oil well to reach the target sinking pressure according to the real operating frequency and the operating frequency amplitude;
And adjusting the operating frequency of the submersible screw pump to the target operating frequency.
Optionally, the adjusting the submersible screw pump to the target operating frequency includes:
acquiring the highest frequency threshold value of the submersible screw pump;
And if the target operating frequency is not greater than the highest frequency threshold, adjusting the operating frequency of the submersible screw pump to the target operating frequency.
Optionally, the method further comprises:
If the target operating frequency is greater than the highest frequency threshold, determining that the highest frequency threshold is not less than the target submersible screw pump of the target operating frequency;
and replacing the submersible screw pump with the target submersible screw pump.
Optionally, the adjusting the submersible screw pump to the target operating frequency includes:
acquiring the lowest frequency threshold value of the submersible screw pump;
And if the target operating frequency is not smaller than the minimum frequency threshold value, adjusting the operating frequency of the submersible screw pump to the target operating frequency.
Optionally, the method further comprises:
and if the target operating frequency is less than the minimum frequency threshold, incorporating the produced-displacement amplitude of fluid into the well.
In another aspect, there is provided a sink pressure control device, the device comprising:
The sinking pressure difference determining module is used for determining the sinking pressure difference between the real sinking pressure of the oil well and the target sinking pressure;
the output displacement amplitude determining module is used for determining the output displacement amplitude of the submersible screw pump which is required to be regulated by the oil well to reach the target sinking pressure according to the inner diameter of the casing in the oil well, the outer diameter of the oil pipe, the fluid density and the sinking pressure difference value;
The operation frequency amplitude determining module is used for determining the operation frequency amplitude of the submersible screw pump required to be adjusted according to the current real operation frequency, the real output displacement and the output displacement amplitude of the submersible screw pump;
and the operating frequency adjusting module is used for adjusting the operating frequency of the submersible screw pump according to the operating frequency amplitude.
Optionally, the apparatus further comprises:
The first parameter acquisition module is used for acquiring the current real oil production, oil production parameters, target oil production and the real sinking pressure of the oil well, wherein the oil production parameters are used for representing the oil production capacity of the oil well under unit production pressure difference;
The target sinking pressure determining module is used for determining the target sinking pressure according to the real oil production, the oil production parameter, the target oil production and the real sinking pressure by adopting the following formula:
Wherein P m is the target sinking pressure, Q 1 is the actual oil yield, Q m is the target oil yield, J is the oil extraction parameter, and P 1 is the actual sinking pressure.
Optionally, the apparatus further comprises:
the second parameter acquisition module is used for acquiring the fluid density, the working fluid level depth and the liquid suction port depth at the liquid suction port of the submersible screw pump in the oil well;
The true sinking pressure is determined by adopting the following formula according to the fluid density, the working fluid level depth and the liquid suction port depth, and the true sinking pressure at the liquid suction port is determined:
P1＝(H1-H2)·ρ·g
Wherein P 1 is the true sinking pressure, H 1 is the liquid suction opening depth, H 2 is the working fluid level depth, ρ is the fluid density, and g is gravity acceleration.
Optionally, the output displacement amplitude determining module includes:
The output displacement amplitude determining unit is used for determining the output displacement amplitude by adopting the following formula:
wherein W t is the output displacement amplitude, P c is the sinking pressure difference, D is the casing inner diameter, D is the oil pipe outer diameter, ρ is the fluid density, pi is the circumference ratio, g is the gravitational acceleration.
Optionally, the operating frequency amplitude determining module includes:
An operation frequency amplitude determining unit for determining the operation frequency amplitude using the following formula:
Wherein F t is the operating frequency amplitude, W t is the produced displacement amplitude, F 1 is the true operating frequency, and W 1 is the true produced displacement.
Optionally, the operation frequency adjusting module includes:
A first adjusting unit for adjusting the operating frequency of the submersible screw pump upward by the operating frequency amplitude if the true sinking pressure is greater than the target sinking pressure;
and the second adjusting unit is used for adjusting the operating frequency of the submersible screw pump downwards by the operating frequency amplitude if the real sinking pressure is smaller than the target sinking pressure.
Optionally, the operation frequency adjusting module includes:
The target operating frequency determining unit is used for determining the target operating frequency of the submersible screw pump required by the oil well to reach the target sinking pressure according to the real operating frequency and the operating frequency amplitude;
and the operating frequency adjusting unit is used for adjusting the operating frequency of the submersible screw pump to the target operating frequency.
Optionally, the operation frequency adjusting unit is configured to:
acquiring the highest frequency threshold value of the submersible screw pump;
And if the target operating frequency is not greater than the highest frequency threshold, adjusting the operating frequency of the submersible screw pump to the target operating frequency.
Optionally, the apparatus further comprises:
the screw pump determining module is used for determining that the highest frequency threshold is not smaller than the target submersible screw pump of the target operating frequency if the target operating frequency is larger than the highest frequency threshold;
and the screw pump replacement module is used for replacing the submersible screw pump with the target submersible screw pump.
Optionally, the operation frequency adjusting unit is configured to:
acquiring the lowest frequency threshold value of the submersible screw pump;
And if the target operating frequency is not smaller than the minimum frequency threshold value, adjusting the operating frequency of the submersible screw pump to the target operating frequency.
Optionally, the apparatus further comprises:
a fluid incorporation module for incorporating the produced displacement amplitude of fluid within the well if the target operating frequency is less than the minimum frequency threshold.
In another aspect, a computer device is provided, the computer device comprising a processor and a memory, the memory storing at least one computer program, the at least one computer program being loaded and executed by the processor to implement the operations performed in the sink pressure control method as described in the above aspect.
In another aspect, there is provided a computer readable storage medium having stored therein at least one computer program loaded and executed by a processor to implement the operations performed in the sink pressure control method as described in the above aspect.
In another aspect, a computer program product or a computer program is provided, the computer program product or the computer program comprising computer program code stored in a computer readable storage medium, the computer program code being loaded and executed by a processor to implement the operations performed in a sink pressure control method as described in the above aspects.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
According to the method, the device, the computer equipment and the storage medium provided by the embodiment of the application, the target operating frequency required to be regulated for the oil well to reach the desired sinking pressure is accurately determined according to parameters such as the actual sinking pressure, the inner diameter of the casing, the outer diameter of the oil pipe, the fluid density, the actual operating frequency, the actual output displacement and the like, and the accuracy of controlling the sinking pressure of the oil well can be improved. .
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a sinking pressure control method provided by an embodiment of the application;
FIG. 2 is a flow chart of another method of controlling sink pressure provided by an embodiment of the present application;
FIG. 3 is a schematic illustration of the submergence height in an annulus of an oil jacket provided in accordance with an embodiment of the present application;
FIG. 4 is a schematic diagram of controlling sinking pressure according to an embodiment of the present application;
FIG. 5 is a schematic view of a sinking pressure control device according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a sinking pressure control device according to an embodiment of the application;
fig. 7 is a schematic structural diagram of a terminal according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a server according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the following detailed description of the embodiments of the present application will be given with reference to the accompanying drawings.
It is to be understood that the terms "first," "second," and the like, as used herein, may be used to describe various concepts, but are not limited by these terms unless otherwise specified. These terms are only used to distinguish one concept from another.
The execution main body of the embodiment of the application is a computer device, optionally, the computer device is a terminal, and the terminal is a portable, pocket-sized, hand-held terminal of various types, such as a mobile phone, a computer, a tablet computer and the like. Optionally, the computer device is a server, and the server may be a server, or a server cluster formed by a plurality of servers, or a cloud computing service center.
Fig. 1 is a flowchart of a sinking pressure control method according to an embodiment of the application. Referring to fig. 1, the method includes:
101. Determining a sink pressure difference between the true sink pressure of the well and the target sink pressure;
102. Determining the output displacement amplitude of the submersible screw pump which is required to be regulated by the oil well to reach the target sinking pressure according to the internal diameter of the casing in the oil well, the external diameter of the oil pipe, the fluid density and the sinking pressure difference value;
103. determining the operation frequency amplitude of the submersible screw pump required to be adjusted according to the current real operation frequency, the real output displacement and the output displacement amplitude of the submersible screw pump;
104. and adjusting the operating frequency of the submersible screw pump according to the operating frequency amplitude.
According to the method provided by the embodiment of the application, the target operating frequency required to be regulated for the oil well to reach the desired sinking pressure is accurately determined according to parameters such as the actual sinking pressure, the inner diameter of the casing, the outer diameter of the oil pipe, the fluid density, the actual operating frequency, the actual output displacement and the like, and the accuracy of controlling the sinking pressure of the oil well can be improved.
Optionally, before determining the sink pressure difference between the true sink pressure and the target sink pressure for the well, the method further comprises:
Acquiring current real oil production, oil production parameters, target oil production and real sinking pressure of an oil well, wherein the oil production parameters are used for representing the oil production capacity of the oil well under unit production pressure difference;
according to the actual oil production, the oil production parameters, the target oil production and the actual sinking pressure, the following formula is adopted to determine the target sinking pressure:
Wherein P m is the target sinking pressure, Q 1 is the actual oil yield, Q m is the target oil yield, J is the oil production parameter, and P 1 is the actual sinking pressure.
Optionally, before determining the sink pressure difference between the true sink pressure and the target sink pressure for the well, the method further comprises:
Acquiring the density of fluid in an oil well, the depth of a working fluid level and the depth of a liquid suction port at the liquid suction port of a submersible screw pump;
According to the fluid density, the working fluid level depth and the liquid suction port depth, the following formula is adopted to determine the real sinking pressure at the liquid suction port:
P1＝(H1-H2)·ρ·g
Wherein P 1 is the true sinking pressure, H 1 is the liquid suction opening depth, H 2 is the working fluid level depth, ρ is the fluid density, g is the gravitational acceleration.
Optionally, determining the output displacement amplitude of the submersible screw pump to be adjusted for the oil well to reach the target sink pressure according to the difference value of the inner diameter of the casing, the outer diameter of the oil pipe, the fluid density and the sink pressure in the oil well comprises:
the output displacement amplitude is determined using the following formula:
Wherein W t is the output displacement amplitude, P c is the sinking pressure difference, D is the inner diameter of the sleeve, D is the outer diameter of the oil pipe, ρ is the fluid density, pi is the circumference ratio, and g is the gravitational acceleration.
Optionally, determining the operation frequency amplitude of the submersible screw pump required to be adjusted according to the current real operation frequency, the real output displacement and the output displacement amplitude of the submersible screw pump comprises:
the operating frequency amplitude is determined using the following formula:
wherein F t is the operating frequency amplitude, W t is the output displacement amplitude, F 1 is the true operating frequency, and W 1 is the true output displacement.
Optionally, adjusting the operating frequency of the submersible screw pump according to the operating frequency amplitude includes:
if the real sinking pressure is larger than the target sinking pressure, the operation frequency of the submersible screw pump is adjusted upwards to the operation frequency amplitude;
And if the real sinking pressure is smaller than the target sinking pressure, the operating frequency of the submersible screw pump is adjusted downwards by the operating frequency amplitude.
Optionally, adjusting the operating frequency of the submersible screw pump according to the operating frequency amplitude includes:
Determining the target operating frequency of the submersible screw pump required by the oil well to reach the target sinking pressure according to the actual operating frequency and the operating frequency amplitude;
and adjusting the operating frequency of the submersible screw pump to a target operating frequency.
Optionally, adjusting the submersible screw pump to a target operating frequency includes:
acquiring the highest frequency threshold value of the submersible screw pump;
And if the target operating frequency is not greater than the highest frequency threshold, adjusting the operating frequency of the submersible screw pump to the target operating frequency.
Optionally, the method further comprises:
if the target operating frequency is greater than the highest frequency threshold, determining that the highest frequency threshold is not less than the target submersible screw pump of the target operating frequency;
And replacing the submersible screw pump with the target submersible screw pump.
Optionally, adjusting the submersible screw pump to a target operating frequency includes:
acquiring the lowest frequency threshold value of the submersible screw pump;
and if the target operating frequency is not less than the lowest frequency threshold, adjusting the operating frequency of the submersible screw pump to the target operating frequency.
Optionally, the method further comprises:
if the target operating frequency is less than the minimum frequency threshold, a production displacement amplitude of fluid is incorporated into the well.
Fig. 2 is a flowchart of a sinking pressure control method according to an embodiment of the application. The execution subject of the embodiment of the application is computer equipment. Referring to fig. 2, the method includes:
201. the computer device determines the true sink pressure of the well.
The submersible screw pump well is an oil extraction mode in which a downhole motor is used for driving a screw pump to lift fluid to the ground. In the production process, the output displacement and the supply condition of the submersible screw pump and whether the submersible screw is normal can be judged according to the sinking pressure at the liquid suction port of the submersible screw pump. The sinking pressure refers to the pressure generated between the working fluid level in the annular space of the oil jacket and the liquid suction port of the submersible screw pump during oil extraction of the submersible screw pump. The distance from the liquid level to the liquid suction port is called the sinking height, and the sinking pressure refers to the pressure generated by fluid at the sinking height.
FIG. 3 is a schematic view of a sinking height in an annular space of an oil jacket, as shown in FIG. 3, in the production process of an electric submersible screw pump well, fluid in the well supplied by a stratum is lifted upwards along an oil pipe by a suction port under the power supplied by a downhole motor and a downhole screw pump, a certain liquid level height is formed in the annular space of the oil jacket, the highest position of the liquid level is a working fluid level, the distance between the working fluid level and the suction port of the downhole screw pump is called sinking height, and the pressure formed by the sinking height is called sinking pressure.
The sinking height determines the sinking pressure of the liquid suction port of the electric submersible screw pump, and the sinking pressure is too high, so that the production potential of an oil well is not exerted; the sinking pressure is too low, so that the pumping efficiency of the screw pump is reduced, the bottom hole pressure is reduced rapidly, and the well stopping risk exists during oil well production, so that the sinking pressure in the well is controlled by adjusting the displacement of the electric submersible screw pump and supplementing the water mixing method, and the pumping efficiency of the submersible screw pump is ensured to be stable. For controlling the sinking pressure, the computer device first determines the true sinking pressure of the well, i.e. the current sinking pressure.
In one possible implementation, where a sink pressure monitor is provided in the well, the computer device determines the sink pressure in the well directly from the sink pressure monitor.
In one possible implementation, the computer device may determine the sink pressure by testing the working fluid level depth of the well and the suction port at the suction port of the submersible screw pump without a sink pressure monitor. The method comprises the steps that the computer equipment obtains the density of fluid in an oil well, the depth of a working fluid level and the depth of a liquid suction port at the liquid suction port of the submersible screw pump, and then the following formula is adopted to determine the real sinking pressure at the liquid suction port according to the density of the fluid, the depth of the working fluid level and the depth of the liquid suction port:
P1＝(H1-H2)·ρ·g
Wherein P 1 is the true sinking pressure, H 1 is the liquid suction opening depth, H 2 is the working fluid level depth, ρ is the fluid density, g is the gravitational acceleration.
The difference between the depth of the liquid suction port and the depth of the working fluid level is the distance between the liquid suction port and the working fluid level, namely the sinking height, and the sinking pressure is the pressure generated by the gravity of the fluid in the well. The computer device thus obtains the fluid density of the fluid in the well, determining the product of the sinking height, the fluid density and the acceleration of gravity as the sinking pressure.
202. The computer device determines a target sink pressure for the well.
The target sinking pressure is a reasonable sinking pressure which is expected to be achieved, and the computer equipment can control the sinking pressure of the oil well to the target sinking pressure after determining the target sinking pressure of the oil well.
In one possible implementation manner, after the oil well is put into the electric submersible screw pump, the flow pressure in the shaft can change gradually along with production, when the stratum supply capacity and the displacement of the submersible screw pump are balanced, the oil well production tends to be stable, and at the moment, the current oil extraction parameter of the oil well can be obtained by adjusting the displacement of the oil well and the change of the working fluid level, and the oil production capacity of the oil well under unit production pressure difference is obtained, for example, the oil production parameter is the unit production pressure difference and the oil production under unit thickness. Wherein the oil recovery parameter can be expressed by the following formula:
Where J is the oil extraction parameter, Q 1 is the current true oil production, Q 2 is the oil production after adjusting the displacement of the screw pump, P 1 is the current true sink pressure, and P 2 is the sink pressure after adjusting the displacement of the screw pump. Wherein, Q 1 and Q 2 are daily oil production of the oil well.
According to the above formula, if the displacement of the screw pump is adjusted to make the daily oil yield of the oil well reach the target oil yield, the target sinking pressure required for reaching the target oil yield can be determined through the real oil yield, the oil production parameter, the target oil yield and the real sinking pressure, so that the computer equipment obtains the current real oil yield, the oil production parameter, the target oil yield and the real sinking pressure of the oil well, and then the following formula is adopted to determine the target sinking pressure according to the real oil yield, the oil production parameter, the target oil yield and the real sinking pressure:
Wherein P m is the target sinking pressure, Q 1 is the actual oil production, Q m is the target oil production, namely the daily oil production when the target sinking pressure is maintained in the oil well, J is the oil production parameter, and P 1 is the actual sinking pressure.
In another possible implementation, the computer device may also employ the method of step 201 described above to determine the target sink pressure based on the distance between the suction port and the working fluid level. In order to maintain the well-in sink pressure at the target sink pressure, the screw pump is required to maintain the target sink height. For example, the target sinking height is 200-300 m, that is, the height difference between the liquid suction port and the working fluid level of the electric submersible screw pump is controlled to be 200-300 m, and the density of the oil-water mixed fluid in the well is 900-1000kg/m 3, so that the target sinking pressure is 1.8-3×10 6 Pa.
203. The computer device determines a sink pressure differential between the true sink pressure of the well and the target sink pressure.
The computer device determines a sink pressure differential, which is the magnitude of the sink pressure to be adjusted to achieve the target sink pressure differential. Wherein the true sink pressure may be greater than the target sink pressure, the sink pressure in the well needs to be controlled to decrease to achieve the target sink pressure. The true sink pressure may also be greater than the target sink pressure, and the sink pressure in the well needs to be controlled to be increased to achieve the target sink pressure.
204. The computer equipment determines the output displacement amplitude of the submersible screw pump which is required to be regulated by the oil well to reach the target sinking pressure according to the internal diameter of the casing in the oil well, the external diameter of the oil pipe, the fluid density and the sinking pressure difference value.
The production displacement of the submersible screw pump is determined according to the pressure condition of the well before the submersible screw pump is lowered into the well. However, in the dynamic production process, the amount of fluid supplied in the well is affected by various factors such as lifting capacity of the submersible screw pump, production pressure difference, water injection effect degree, stratum permeability and the like. Therefore, in order to ensure stable production of the oil well, the output displacement of the submersible screw pump can be further adjusted in order to adjust the sinking pressure in the oil well to reach the target sinking pressure. The change in the displacement of the submersible screw pump results in a change in the sinking level and hence the sinking pressure in the well. The larger the output displacement of the submersible screw pump is, the smaller the sinking height in the oil well is, and the lower the sinking pressure in the oil well is. The smaller the output displacement of the submersible screw pump, the larger the sinking height in the oil well, the larger the sinking pressure in the oil well.
Since the sink pressure is related to the weight of the fluid in the well, the weight of the fluid is related to the fluid density, the inside diameter of the casing in the well and the outside diameter of the tubing, the computer device obtains the inside diameter of the casing in the well, the outside diameter of the tubing and the fluid density, and determines the output displacement amplitude of the submersible screw pump to be adjusted for the well to reach the target sink pressure based on the inside diameter of the casing in the well, the outside diameter of the tubing, the fluid density and the sink pressure difference.
In one possible implementation, the computer device determines the produced displacement amplitude using the following formula:
Wherein W t is the output displacement amplitude, P c is the sinking pressure difference, D is the inner diameter of the sleeve, D is the outer diameter of the oil pipe, ρ is the fluid density, pi is the circumference ratio, and g is the gravitational acceleration. Wherein, P c is the absolute value of the difference between P m and P 1 in the above step 202.
205. The computer equipment determines the operation frequency amplitude of the submersible screw pump required to be adjusted according to the current real operation frequency, the real output displacement and the output displacement amplitude of the submersible screw pump.
The output displacement of the submersible screw pump can be adjusted by adjusting the rotation speed of the submersible screw pump, and the rotation speed of the submersible screw pump is determined by the operation frequency of the submersible screw pump. The output displacement of the submersible screw pump is smaller as the operation frequency of the submersible screw pump is smaller. Therefore, the computer equipment can determine the operation frequency amplitude of the submersible screw pump which needs to be adjusted according to the current real operation frequency, the real output displacement and the output displacement amplitude of the submersible screw pump.
In one possible implementation, the computer device determines the operating frequency amplitude using the following formula:
Wherein F t is the operating frequency amplitude, W t is the output displacement amplitude, F 1 is the true operating frequency, and W 1 is the true output displacement. In the adjustment, if the output displacement of the submersible screw pump is increased, the operating frequency of the submersible screw pump is adjusted upwards, and if the output displacement of the electric submersible screw pump is reduced, the operating frequency of the submersible screw pump is required to be adjusted downwards.
206. The computer device adjusts the operating frequency of the submersible screw pump according to the operating frequency amplitude.
The computer equipment determines the operating frequency amplitude of the submersible screw pump to be regulated, and adjusts the operating frequency of the submersible screw pump according to the operating frequency amplitude, so that the output displacement of the submersible screw pump is regulated, and the sinking pressure in the oil well reaches the target sinking pressure. Wherein the computer device is a device deployed in a surface control system, so that the operating frequency of the downhole submersible screw pump can be adjusted by the computer device in the surface control system.
In one possible implementation, if the true sink pressure is greater than the target sink pressure, the computer device adjusts the operating frequency of the submersible screw pump upward by an operating frequency amplitude; if the true sink pressure is less than the target sink pressure, the computer device adjusts the operating frequency of the submersible screw pump downward by an operating frequency amplitude.
If the real sinking pressure is larger than the target sinking pressure, the sinking pressure in the oil well needs to be controlled to be reduced, the output displacement of the submersible screw pump needs to be increased in order to reduce the sinking pressure, and the operating frequency of the submersible screw pump needs to be increased in order to increase the output displacement of the submersible screw pump, so that the operating frequency of the submersible screw pump needs to be adjusted upwards in order to control the oil well to reach the target sinking pressure.
If the real sinking pressure is smaller than the target sinking pressure, the sinking pressure in the oil well needs to be controlled to be increased, the output displacement of the submersible screw pump needs to be reduced in order to increase the sinking pressure, the operating frequency of the submersible screw pump needs to be reduced in order to reduce the output displacement of the submersible screw pump, and therefore the operating frequency of the submersible screw pump needs to be adjusted downwards in order to control the oil well to reach the target sinking pressure.
In another possible implementation, the computer device determines a target operating frequency of the submersible screw pump required for the oil well to reach the target sink pressure based on the actual operating frequency and the operating frequency amplitude, and adjusts the operating frequency of the submersible screw pump to the target operating frequency. If the real sinking pressure is larger than the target sinking pressure, determining the sum of the real operating frequency and the operating frequency amplitude as the target operating frequency; if the true sink pressure is less than the target sink pressure, the difference of the true operating frequency minus the operating frequency amplitude is determined as the target operating frequency.
Optionally, the computer device obtains a highest frequency threshold of the submersible screw pump, and adjusts the operating frequency of the submersible screw pump to the target operating frequency if the target operating frequency is not greater than the highest frequency threshold. If the target operating frequency is greater than the maximum frequency threshold, the computer device determines that the maximum frequency threshold is not less than the target submersible screw pump of the target operating frequency, and replaces the current submersible screw pump with the target submersible screw pump.
When the formation pressure is high and the fluid supplied at the bottom of the well is very sufficient, if the target operating frequency is greater than the highest frequency threshold, the maximum output displacement of the underground submersible screw pump is smaller, and the output displacement required for reaching the target sinking pressure cannot be met, even if the operating frequency of the submersible screw pump is adjusted to the highest frequency threshold, the actual sinking pressure of the oil well is still greater than the target sinking pressure, so that the production potential of the oil well cannot be fully exerted. Therefore, the computer equipment redetermines the target submersible screw pump with the highest frequency threshold value not smaller than the target operating frequency, replaces the current submersible screw pump with the target submersible screw pump, and then adjusts the operating frequency of the target submersible screw pump to the target operating frequency, thereby meeting the production requirement.
Optionally, the computer device obtains a lowest frequency threshold of the submersible screw pump, and adjusts the operating frequency of the submersible screw pump to the target operating frequency if the target operating frequency is not less than the lowest frequency threshold. If the target operating frequency is less than the minimum frequency threshold, a production displacement amplitude of fluid is incorporated into the well.
In order to ensure that the underground unit of the submersible screw pump can carry heat generated by the motor through pumped fluid during operation, the unit is prevented from being burnt out due to overhigh temperature, and therefore the lowest operating frequency of the submersible screw pump, namely the lowest frequency threshold, is limited during the operation of the submersible screw pump. In the case of very low formation pressure in production, if the target operating frequency is less than the minimum frequency threshold, even if the operating frequency of the submersible screw pump is adjusted to the minimum frequency threshold, the true dip pressure of the well will still be less than the target dip pressure. If the operation frequency of the submersible screw pump is adjusted to the target operation frequency by the forced running, the downhole submersible screw pump is stopped, and the production of the oil well is abnormal. Thus, the computer device causes the sink pressure in the well to reach the target sink pressure by incorporating a production displacement amplitude of fluid in the well.
The liquid mixed in the oil well is water, optionally, water produced by the oil well in the oil extraction process, or other types of liquid, which is not limited in the embodiment of the application.
FIG. 4 is a schematic diagram of controlling the sinking pressure according to an embodiment of the present application, as shown in FIG. 4, in production, the operating frequency of the submersible screw pump in the well may be adjusted by a computer device in the ground control system, so as to control the sinking pressure to be the target sinking pressure, and when the lowest frequency threshold value also fails to meet the target sinking pressure, water is poured into the annular space of the oil casing, so as to ensure that the target sinking pressure is reached in the oil well.
According to the method provided by the embodiment of the application, the target operating frequency required to be regulated for the oil well to reach the desired sinking pressure is accurately determined according to parameters such as the actual sinking pressure, the inner diameter of the casing, the outer diameter of the oil pipe, the fluid density, the actual operating frequency, the actual output displacement and the like, and the accuracy of controlling the sinking pressure of the oil well can be improved.
And according to the dynamic change of the oil extraction capacity of the submersible screw pump in the oil well, the running frequency of the submersible screw pump is adjusted, or water is poured into the annular space of the oil sleeve, so that the submersible screw pump well is guaranteed to be in high-efficiency production, the oil extraction efficiency of the submersible screw pump is improved, and the phenomenon that the oil well stops production due to too low sinking pressure in production is avoided.
And moreover, the accuracy of controlling the sinking pressure of the oil well is improved, so that the sinking pressure of the oil well is controlled within a reasonable range, and the submersible screw pump can fully exert production potential, improve oil extraction efficiency and ensure production stability in the production process.
Fig. 5 is a schematic structural diagram of a sinking pressure control device according to an embodiment of the application. Referring to fig. 5, the apparatus includes:
a sink pressure difference determining module 501 for determining a sink pressure difference between a true sink pressure of the well and a target sink pressure;
The output displacement amplitude determining module 502 is configured to determine, according to the casing inside diameter, the tubing outside diameter, the fluid density and the sink pressure difference value in the oil well, the output displacement amplitude of the submersible screw pump that needs to be adjusted for the oil well to reach the target sink pressure;
an operation frequency amplitude determining module 503, configured to determine an operation frequency amplitude of the submersible screw pump to be adjusted according to a current real operation frequency, a real output displacement and an output displacement amplitude of the submersible screw pump;
An operating frequency adjustment module 504 for adjusting the operating frequency of the submersible screw pump according to the operating frequency amplitude.
According to the device provided by the embodiment of the application, the target operating frequency required to be regulated for the oil well to reach the desired sinking pressure is accurately determined according to parameters such as the actual sinking pressure, the inner diameter of the casing, the outer diameter of the oil pipe, the fluid density, the actual operating frequency, the actual output displacement and the like, and the accuracy of controlling the sinking pressure of the oil well can be improved.
Optionally, referring to fig. 6, the apparatus further includes:
A first parameter obtaining module 505, configured to obtain a current actual oil production, an oil production parameter, a target oil production, and an actual sinking pressure of the oil well, where the oil production parameter is used to represent an oil production capacity of the oil well under a unit production pressure difference;
the target sinking pressure determining module 506 is configured to determine the target sinking pressure according to the actual oil production, the oil production parameter, the target oil production and the actual sinking pressure by adopting the following formula:
Wherein P m is the target sinking pressure, Q 1 is the actual oil yield, Q m is the target oil yield, J is the oil production parameter, and P 1 is the actual sinking pressure.
Optionally, referring to fig. 6, the apparatus further includes:
The second parameter obtaining module 507 is configured to obtain a fluid density, a working fluid level depth, and a liquid suction port depth at a liquid suction port of the submersible screw pump in the oil well;
the true sinking pressure determination 508 is configured to determine the true sinking pressure at the suction port according to the fluid density, the working fluid level depth, and the suction port depth by using the following formula:
P1＝(H1-H2)·ρ·g
Wherein P 1 is the true sinking pressure, H 1 is the liquid suction opening depth, H 2 is the working fluid level depth, ρ is the fluid density, g is the gravitational acceleration.
Optionally, referring to fig. 6, the produced displacement amplitude determination module 502 includes:
the output displacement amplitude determining unit 5021 is configured to determine the output displacement amplitude by using the following formula:
Wherein W t is the output displacement amplitude, P c is the sinking pressure difference, D is the inner diameter of the sleeve, D is the outer diameter of the oil pipe, ρ is the fluid density, pi is the circumference ratio, and g is the gravitational acceleration.
Optionally, referring to fig. 6, the operating frequency amplitude determining module 503 includes:
an operation frequency amplitude determination unit 5031 for determining an operation frequency amplitude using the following formula:
wherein F t is the operating frequency amplitude, W t is the output displacement amplitude, F 1 is the true operating frequency, and W 1 is the true output displacement.
Optionally, referring to fig. 6, the operating frequency adjustment module 504 includes:
a first adjusting unit 5041 for adjusting the operating frequency of the submersible screw pump upward by an operating frequency amplitude if the true sinking pressure is greater than the target sinking pressure;
A second adjusting unit 5042 for adjusting the operating frequency of the submersible screw pump down in the operating frequency amplitude if the true sink pressure is less than the target sink pressure.
Optionally, referring to fig. 6, the operating frequency adjustment module 504 includes:
a target operating frequency determining unit 5043 for determining a target operating frequency of the submersible screw pump required for the oil well to reach the target sinking pressure according to the actual operating frequency and the operating frequency amplitude;
An operating frequency adjusting unit 5044 for adjusting the operating frequency of the submersible screw pump to a target operating frequency.
Alternatively, referring to fig. 6, an operating frequency adjusting unit 5044 for:
acquiring the highest frequency threshold value of the submersible screw pump;
And if the target operating frequency is not greater than the highest frequency threshold, adjusting the operating frequency of the submersible screw pump to the target operating frequency.
Optionally, referring to fig. 6, the apparatus further includes:
A screw pump determination module 509 configured to determine a target submersible screw pump having a highest frequency threshold that is not less than the target operating frequency if the target operating frequency is greater than the highest frequency threshold;
the screw pump replacement module 510 is configured to replace the submersible screw pump with the target submersible screw pump.
Alternatively, referring to fig. 6, an operating frequency adjusting unit 5044 for:
acquiring the lowest frequency threshold value of the submersible screw pump;
and if the target operating frequency is not less than the lowest frequency threshold, adjusting the operating frequency of the submersible screw pump to the target operating frequency.
Optionally, referring to fig. 6, the apparatus further includes:
A fluid incorporation module 511 for incorporating a produced displacement amplitude of fluid into the well if the target operating frequency is less than the minimum frequency threshold.
Any combination of the above optional solutions may be adopted to form an optional embodiment of the present application, which is not described herein.
It should be noted that: in the sinking pressure control device provided in the above embodiment, only the division of the above functional modules is used for illustration, and in practical application, the above functional allocation may be performed by different functional modules according to needs, that is, the internal structure of the computer device is divided into different functional modules, so as to perform all or part of the functions described above. In addition, the sinking pressure control device and the sinking pressure control method provided in the above embodiments belong to the same concept, and specific implementation processes thereof are detailed in the method embodiments, which are not repeated here.
The embodiment of the application also provides a computer device, which comprises a processor and a memory, wherein at least one computer program is stored in the memory, and the at least one computer program is loaded and executed by the processor to realize the operation executed in the sinking pressure control method of the embodiment.
In one possible implementation, the computer device is provided as a terminal. Fig. 7 shows a block diagram of a terminal 700 according to an exemplary embodiment of the present application. The terminal 700 may be a portable mobile terminal such as: a smart phone, a tablet computer, an MP3 player (Moving Picture Experts Group Audio Layer III, motion picture expert compression standard audio plane 3), an MP4 (Moving Picture Experts Group Audio Layer IV, motion picture expert compression standard audio plane 4) player, a notebook computer, or a desktop computer. Terminal 700 may also be referred to by other names of user devices, portable terminals, laptop terminals, desktop terminals, etc.
The terminal 700 includes: a processor 701 and a memory 702.
Processor 701 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and the like. The processor 701 may be implemented in at least one hardware form of DSP (DIGITAL SIGNAL Processing), FPGA (Field-Programmable gate array), PLA (Programmable Logic Array ). The processor 701 may also include a main processor and a coprocessor, wherein the main processor is a processor for processing data in an awake state, and is also called a CPU (Central Processing Unit ); a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 701 may be integrated with a GPU (Graphics Processing Unit, image processor) for rendering and drawing of content required to be displayed by the display screen. In some embodiments, the processor 701 may also include an AI (ARTIFICIAL INTELLIGENCE ) processor for processing computing operations related to machine learning.
Memory 702 may include one or more computer-readable storage media, which may be non-transitory. The memory 702 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in memory 702 is used to store at least one computer program for execution by processor 701 to implement the sink pressure control method provided by the method embodiments of the present application.
In some embodiments, the terminal 700 may further optionally include: a peripheral interface 703 and at least one peripheral. The processor 701, the memory 702, and the peripheral interface 703 may be connected by a bus or signal lines. The individual peripheral devices may be connected to the peripheral device interface 703 via buses, signal lines or a circuit board. Optionally, the peripheral device comprises: at least one of radio frequency circuitry 704, a display screen 705, and a power supply 706.
A peripheral interface 703 may be used to connect I/O (Input/Output) related at least one peripheral device to the processor 701 and memory 702. In some embodiments, the processor 701, memory 702, and peripheral interface 703 are integrated on the same chip or circuit board; in some other embodiments, either or both of the processor 701, the memory 702, and the peripheral interface 703 may be implemented on separate chips or circuit boards, which is not limited in this embodiment.
The Radio Frequency circuit 704 is configured to receive and transmit RF (Radio Frequency) signals, also referred to as electromagnetic signals. The radio frequency circuitry 704 communicates with a communication network and other communication devices via electromagnetic signals. The radio frequency circuit 704 converts an electrical signal into an electromagnetic signal for transmission, or converts a received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 704 includes: antenna systems, RF transceivers, one or more amplifiers, tuners, oscillators, digital signal processors, codec chipsets, subscriber identity module cards, and so forth. The radio frequency circuitry 704 may communicate with other terminals via at least one wireless communication protocol. The wireless communication protocol includes, but is not limited to: the world wide web, metropolitan area networks, intranets, generation mobile communication networks (2G, 3G, 4G, and 5G), wireless local area networks, and/or WiFi (WIRELESS FIDELITY ) networks. In some embodiments, the radio frequency circuit 704 may further include NFC (NEAR FIELD Communication) related circuits, which is not limited by the present application.
The display screen 705 is used to display a UI (User Interface). The UI may include graphics, text, icons, video, and any combination thereof. When the display 705 is a touch display, the display 705 also has the ability to collect touch signals at or above the surface of the display 705. The touch signal may be input to the processor 701 as a control signal for processing. At this time, the display 705 may also be used to provide virtual buttons and/or virtual keyboards, also referred to as soft buttons and/or soft keyboards. In some embodiments, the display 705 may be one and disposed on the front panel of the terminal 700; in other embodiments, the display 705 may be at least two, respectively disposed on different surfaces of the terminal 700 or in a folded design; in other embodiments, the display 705 may be a flexible display disposed on a curved surface or a folded surface of the terminal 700. Even more, the display 705 may be arranged in a non-rectangular irregular pattern, i.e. a shaped screen. The display 705 may be made of LCD (Liquid CRYSTAL DISPLAY), OLED (Organic Light-Emitting Diode) or other materials.
The power supply 706 is used to power the various components in the terminal 700. The power source 706 may be alternating current, direct current, disposable or rechargeable. When the power source 706 comprises a rechargeable battery, the rechargeable battery may be a wired rechargeable battery or a wireless rechargeable battery. The wired rechargeable battery is a battery charged through a wired line, and the wireless rechargeable battery is a battery charged through a wireless coil. The rechargeable battery may also be used to support fast charge technology.
Those skilled in the art will appreciate that the structure shown in fig. 7 is not limiting of the terminal 700 and may include more or fewer components than shown, or may combine certain components, or may employ a different arrangement of components.
In another possible implementation, the computer device is provided as a server. Fig. 8 is a schematic structural diagram of a server according to an embodiment of the present application, where the server 800 may have a relatively large difference due to different configurations or performances, and may include one or more processors (Central Processing Units, CPUs) 801 and one or more memories 802, where at least one computer program is stored in the memories 802, and the at least one computer program is loaded and executed by the processors 801 to implement the methods provided in the above-described method embodiments. Of course, the server may also have a wired or wireless network interface, a keyboard, an input/output interface, and other components for implementing the functions of the device, which are not described herein.
Server 800 may be used to perform the steps performed by the server in the sink pressure control method described above.
The embodiment of the application also provides a computer readable storage medium, in which at least one computer program is stored, the at least one computer program being loaded and executed by a processor to implement the operations performed in the sinking pressure control method of the above embodiment.
Embodiments of the present application also provide a computer program product or a computer program comprising computer program code stored in a computer readable storage medium, the computer program code being loaded and executed by a processor to implement the operations performed in a sink pressure control method as described in the above aspects.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the above storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The foregoing is merely an alternative embodiment of the present application and is not intended to limit the embodiment of the present application, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the embodiment of the present application should be included in the protection scope of the present application.
Claims (14)
1. A method of controlling a sinking pressure, the method comprising:
determining a sink pressure difference between the true sink pressure of the well and the target sink pressure;
determining the output displacement amplitude of the submersible screw pump which is required to be regulated by the oil well to reach the target sinking pressure according to the inner diameter of the casing in the oil well, the outer diameter of the oil pipe, the fluid density and the sinking pressure difference value;
determining the operation frequency amplitude of the submersible screw pump required to be adjusted according to the current real operation frequency, the real output displacement and the output displacement amplitude of the submersible screw pump;
And adjusting the operating frequency of the submersible screw pump according to the operating frequency amplitude.
2. The method of claim 1, wherein prior to determining the sink pressure difference between the true sink pressure and the target sink pressure for the well, the method further comprises:
Acquiring current real oil production, oil production parameters, target oil production and real sinking pressure of the oil well, wherein the oil production parameters are used for representing the oil production capacity of the oil well under unit production pressure difference;
according to the actual oil production, the oil production parameters, the target oil production and the actual sinking pressure, the target sinking pressure is determined by adopting the following formula:
Wherein P m is the target sinking pressure, Q 1 is the actual oil yield, Q m is the target oil yield, J is the oil extraction parameter, and P 1 is the actual sinking pressure.
3. The method of claim 1, wherein prior to determining the sink pressure difference between the true sink pressure and the target sink pressure for the well, the method further comprises:
Acquiring the fluid density, the working fluid level depth and the liquid suction port depth of the liquid suction port of the submersible screw pump in the oil well;
Determining the true sinking pressure at the liquid suction port according to the fluid density, the working fluid level depth and the liquid suction port depth by adopting the following formula:
P1＝(H1-H2)·ρ·g
Wherein P 1 is the true sinking pressure, H 1 is the liquid suction opening depth, H 2 is the working fluid level depth, ρ is the fluid density, and g is gravity acceleration.
4. The method of claim 1, wherein said determining the production displacement amplitude of the submersible screw pump to be adjusted for the well to achieve the target sink pressure based on the inside diameter of the casing, the outside diameter of the tubing, the fluid density, and the sink pressure differential within the well comprises:
the output displacement amplitude is determined using the following equation:
wherein W t is the output displacement amplitude, P c is the sinking pressure difference, D is the casing inner diameter, D is the oil pipe outer diameter, ρ is the fluid density, pi is the circumference ratio, g is the gravitational acceleration.
5. The method of claim 1, wherein said determining the operating frequency amplitude of the submersible screw pump to be adjusted based on the current actual operating frequency of the submersible screw pump, the actual production displacement, and the production displacement amplitude comprises:
the operating frequency amplitude is determined using the following formula:
Wherein F t is the operating frequency amplitude, W t is the produced displacement amplitude, F 1 is the true operating frequency, and W 1 is the true produced displacement.
6. The method of claim 1, wherein said adjusting the operating frequency of the submersible screw pump in accordance with the operating frequency amplitude comprises:
If the real sinking pressure is larger than the target sinking pressure, the operation frequency of the submersible screw pump is adjusted upwards by the operation frequency amplitude;
and if the real sinking pressure is smaller than the target sinking pressure, the operating frequency of the submersible screw pump is adjusted downwards by the operating frequency amplitude.
7. The method of claim 1, wherein said adjusting the operating frequency of the submersible screw pump in accordance with the operating frequency amplitude comprises:
determining a target operating frequency of the submersible screw pump required by the oil well to reach the target sinking pressure according to the real operating frequency and the operating frequency amplitude;
And adjusting the operating frequency of the submersible screw pump to the target operating frequency.
8. The method of claim 7, wherein said adjusting the operating frequency of the submersible screw pump to the target operating frequency comprises:
acquiring the highest frequency threshold value of the submersible screw pump;
And if the target operating frequency is not greater than the highest frequency threshold, adjusting the operating frequency of the submersible screw pump to the target operating frequency.
9. The method of claim 8, wherein the method further comprises:
If the target operating frequency is greater than the highest frequency threshold, determining that the highest frequency threshold is not less than the target submersible screw pump of the target operating frequency;
and replacing the submersible screw pump with the target submersible screw pump.
10. The method of claim 7, wherein said adjusting the operating frequency of the submersible screw pump to the target operating frequency comprises:
acquiring the lowest frequency threshold value of the submersible screw pump;
And if the target operating frequency is not smaller than the minimum frequency threshold value, adjusting the operating frequency of the submersible screw pump to the target operating frequency.
11. The method according to claim 10, wherein the method further comprises:
and if the target operating frequency is less than the minimum frequency threshold, incorporating the produced-displacement amplitude of fluid into the well.
12. A sink pressure control device, the device comprising:
The sinking pressure difference determining module is used for determining the sinking pressure difference between the real sinking pressure of the oil well and the target sinking pressure;
the output displacement amplitude determining module is used for determining the output displacement amplitude of the submersible screw pump which is required to be regulated by the oil well to reach the target sinking pressure according to the inner diameter of the casing in the oil well, the outer diameter of the oil pipe, the fluid density and the sinking pressure difference value;
The operation frequency amplitude determining module is used for determining the operation frequency amplitude of the submersible screw pump required to be adjusted according to the current real operation frequency, the real output displacement and the output displacement amplitude of the submersible screw pump;
and the operating frequency adjusting module is used for adjusting the operating frequency of the submersible screw pump according to the operating frequency amplitude.
13. A computer device comprising a processor and a memory, wherein the memory has stored therein at least one computer program that is loaded and executed by the processor to implement the operations performed in the sink pressure control method of any one of claims 1 to 11.
14. A computer readable storage medium, characterized in that at least one computer program is stored in the computer readable storage medium, which is loaded and executed by a processor to realize the operations performed in the sink pressure control method according to any one of claims 1 to 11.
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