CN114165220A - Method and device for controlling plunger lifting system to open and close well - Google Patents
Method and device for controlling plunger lifting system to open and close well Download PDFInfo
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- CN114165220A CN114165220A CN202010847241.5A CN202010847241A CN114165220A CN 114165220 A CN114165220 A CN 114165220A CN 202010847241 A CN202010847241 A CN 202010847241A CN 114165220 A CN114165220 A CN 114165220A
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- well
- lifting system
- pressure
- plunger lifting
- plunger
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/16—Control means therefor being outside the borehole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/122—Gas lift
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
Abstract
The invention discloses a method and a device for controlling a plunger lifting system to open and close a well, wherein the method comprises the following steps: acquiring the shut-in casing pressure, the shut-in oil pressure and the pipeline back pressure of a plunger lifting system; determining whether to control the plunger lifting system to open the well according to the acquired well closing casing pressure, the well closing oil pressure and the pipeline back pressure as well as the preset correlation among the well closing casing pressure, the well closing oil pressure and the pipeline back pressure; obtaining a measured instantaneous gas production at a wellhead location; calculating the instantaneous critical liquid carrying flow of the plunger lifting system in real time; and when the instantaneous gas production is smaller than the instantaneous critical liquid carrying flow, controlling the plunger lifting system to close the well. The invention can realize the automatic control of the switch well of the plunger lifting system, and compared with the prior art, the invention avoids the problem of gas well production stoppage caused by gas well liquid accumulation due to incorrect selection of the switch well time, and improves the gas production efficiency of the plunger lifting system.
Description
Technical Field
The invention relates to the technical field of gas production processes, in particular to a method and a device for controlling a plunger lifting system to open and close a well.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
The plunger lifting process has the characteristics of high automation degree, low operation cost, environmental protection and the like, is a drainage and gas production process widely applied to low-pressure low-yield gas wells, develops a plunger lifting process field test well, and has the effect of restoring productivity under the condition of well shut-in. At present, the plunger lifting process is mainly realized by a plunger lifting system.
However, the plunger lift system often has problems in operation due to incorrect selection of the timing for opening and closing the well as follows:
1. the problem of incorrect timing selection during well opening: once a compressor on an operation site is stopped, the production of a gas well is greatly influenced, and due to the fact that the back pressure of a pipeline is high, a plunger cannot reach a well head easily after a well is opened, and liquid accumulation at the bottom of the well is caused; 2. the problem of incorrect selection of well shut-in time: because the current plunger lifting process is based on a fixed follow current time, the problem of gas well production drop can be caused when the compressor is stopped in the test process. Due to the fact that the correct shut-in time is not reached, the gas well can not be shut in, bottom hole liquid accumulation is caused easily, the gas well is still in a liquid drainage stage, the shut-in time is up, the gas well is shut in, the liquid accumulation falls back, and the like.
In conclusion, in the operation process of the plunger lifting system, the problem of gas well liquid accumulation caused by incorrect selection of the well opening and closing time often occurs, so that the gas well is stopped, and the gas production efficiency of the plunger lifting system is finally reduced.
Disclosure of Invention
The embodiment of the invention provides a method for controlling a plunger lifting system to open and close a well, which is used for improving the gas production efficiency of the plunger lifting system and comprises the following steps:
acquiring the shut-in casing pressure, the shut-in oil pressure and the pipeline back pressure of a plunger lifting system;
determining whether to control the plunger lifting system to open the well according to the acquired well closing casing pressure, the well closing oil pressure and the pipeline back pressure as well as the preset correlation among the well closing casing pressure, the well closing oil pressure and the pipeline back pressure;
obtaining a measured instantaneous gas production at a wellhead location;
calculating the instantaneous critical liquid carrying flow of the plunger lifting system in real time;
and when the instantaneous gas production is smaller than the instantaneous critical liquid carrying flow, controlling the plunger lifting system to close the well.
The embodiment of the invention also provides a device for controlling the plunger lifting system to open and close the well, which is used for improving the gas production efficiency of the plunger lifting system and comprises:
the information acquisition module is used for acquiring the well closing sleeve pressure, the well closing oil pressure and the pipeline back pressure of the plunger lifting system;
the control well opening module is used for determining whether to control the plunger lifting system to open a well according to the acquired well closing casing pressure, the well closing oil pressure and the pipeline back pressure as well as the preset incidence relation among the well closing casing pressure, the well closing oil pressure and the pipeline back pressure;
the instantaneous gas production measuring module is used for obtaining the measured instantaneous gas production at the wellhead position;
the critical liquid carrying flow calculation module is used for calculating the instantaneous critical liquid carrying flow of the plunger lifting system in real time;
and the well closing control module is used for controlling the plunger lifting system to close the well when the instantaneous gas production is less than the instantaneous critical liquid carrying flow.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the computer program to realize the method for controlling the plunger lifting system to open and close the well.
Embodiments of the present invention also provide a computer-readable storage medium storing a computer program for executing the method for controlling a plunger lift system to open and close a well.
In the embodiment of the invention, well closing sleeve pressure, well closing oil pressure and pipeline back pressure of a plunger lifting system are obtained; determining whether to control the plunger lifting system to open the well according to the acquired well closing casing pressure, the well closing oil pressure and the pipeline back pressure as well as the preset correlation among the well closing casing pressure, the well closing oil pressure and the pipeline back pressure; obtaining a measured instantaneous gas production at a wellhead location; calculating the instantaneous critical liquid carrying flow of the plunger lifting system in real time; when the instantaneous gas production is less than the instantaneous critical liquid carrying flow, the plunger lifting system is controlled to close the well, so that the automatic control of the switch well of the plunger lifting system can be realized, compared with the prior art, the problem that the gas well is stopped because of gas well liquid accumulation caused by incorrect selection of the switch well time is avoided, and the gas production efficiency of the plunger lifting system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 invention, 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 schematic flow chart illustrating a method for controlling a plunger lift system to open and close a well according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating an embodiment of a method for controlling a plunger lift system to open and close a well;
FIG. 3 is a diagram illustrating an embodiment of a method for controlling a plunger lift system to open and close a well;
FIG. 4 is a schematic structural diagram of an apparatus for controlling a plunger lift system to open and close a well according to an embodiment of the present invention;
FIG. 5 is a diagram of an embodiment of an apparatus for controlling a plunger lift system to open and close a well.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Fig. 1 is a schematic flow chart of a method for controlling a plunger lift system to open and close a well according to an embodiment of the present invention, and as shown in fig. 1, the method for controlling a plunger lift system to open and close a well according to an embodiment of the present invention may include the following steps:
step 101: acquiring the shut-in casing pressure, the shut-in oil pressure and the pipeline back pressure of a plunger lifting system;
step 102: determining whether to control the plunger lifting system to open the well according to the acquired well closing casing pressure, the well closing oil pressure and the pipeline back pressure as well as the preset correlation among the well closing casing pressure, the well closing oil pressure and the pipeline back pressure;
step 103: obtaining a measured instantaneous gas production at a wellhead location;
step 104: calculating the instantaneous critical liquid carrying flow of the plunger lifting system in real time;
step 105: and when the instantaneous gas production is smaller than the instantaneous critical liquid carrying flow, controlling the plunger lifting system to close the well.
In the embodiment of the invention, well closing sleeve pressure, well closing oil pressure and pipeline back pressure of a plunger lifting system are obtained; determining whether to control the plunger lifting system to open the well according to the acquired well closing casing pressure, the well closing oil pressure and the pipeline back pressure as well as the preset correlation among the well closing casing pressure, the well closing oil pressure and the pipeline back pressure; obtaining a measured instantaneous gas production at a wellhead location; calculating the instantaneous critical liquid carrying flow of the plunger lifting system in real time; when the instantaneous gas production is less than the instantaneous critical liquid carrying flow, the plunger lifting system is controlled to close the well, so that the automatic control of the switch well of the plunger lifting system can be realized, compared with the prior art, the problem that the gas well is stopped because of gas well liquid accumulation caused by incorrect selection of the switch well time is avoided, and the gas production efficiency of the plunger lifting system is improved.
When the method is specifically implemented, well shut-in casing pressure, well shut-in oil pressure and pipeline back pressure of a plunger lifting system are obtained firstly.
In the embodiment, the well shut-in casing pressure, the well shut-in oil pressure and the pipeline back pressure of the plunger lifting system are obtained through pressure sensors respectively arranged on a well head and a compressor.
In the embodiment, the well closing sleeve pressure, the well closing oil pressure and the pipeline back pressure of the plunger lifting system are obtained, so that the plunger lifting system is controlled to open the well in the subsequent steps.
During specific implementation, after the well closing casing pressure, the well closing oil pressure and the pipeline back pressure of the plunger lifting system are obtained, whether the plunger lifting system is controlled to open a well is determined according to the obtained well closing casing pressure, the obtained well closing oil pressure and the obtained pipeline back pressure as well as the preset correlation among the well closing casing pressure, the obtained well closing oil pressure and the preset pipeline back pressure.
In an embodiment, there are various methods for determining whether to control the plunger lift system to open the well according to the acquired well shut-in casing pressure, well shut-in oil pressure and pipeline return pressure, and the preset correlation relationship between the well shut-in casing pressure, the well shut-in oil pressure and the pipeline return pressure, for example, as shown in fig. 2, the method may include the following steps:
step 201: calculating the load factor of the plunger lifting system according to the acquired well shut-in casing pressure, well shut-in oil pressure and pipeline back pressure as well as the preset correlation among the well shut-in casing pressure, the well shut-in oil pressure and the pipeline back pressure; the load factor is used for determining whether to control the plunger lifting system to open the well;
step 202: and when the load factor is smaller than the preset value, determining to control the plunger lifting system to open the well.
In the above embodiment, the load factor of the plunger lift system can be calculated according to the preset correlation among the shut-in casing pressure, the shut-in oil pressure and the pipeline back pressure. The load factor of the plunger lifting system is calculated quantitatively, accurate calculation for controlling the well opening of the plunger lifting system can be realized, automatic judgment of the well opening time of the plunger lifting system is realized, intelligent control for automatically judging the well opening time of the plunger lifting process is realized, the problem of gas well accumulated liquid production stop caused by ineffective well opening is reduced, and the gas production efficiency of the plunger lifting process is improved finally.
In specific implementation, the method for controlling the plunger lift system to open and close the well provided in the embodiment of the present invention may further include: and when the load factor is larger than or equal to the preset value, acquiring the well closing casing pressure, the well closing oil pressure and the pipeline back pressure again at intervals of a preset time period, recalculating the load factor of the plunger lifting system, and determining to control the plunger lifting system to open the well until the load factor is smaller than a preset numerical value.
In the embodiment, the preset value can be flexibly set according to the requirements of actually controlling the plunger lifting system to open and close the well in different work areas, so that the flexible control of the plunger lifting system to open the well is realized, the adaptability of the method for controlling the plunger lifting system to open and close the well is improved, and the application range is expanded.
In the embodiment, the well closing sleeve pressure, the well closing oil pressure and the pipeline back pressure are obtained again every preset time period, the load factor of the plunger lifting system is recalculated, and the well opening of the plunger lifting system is determined and controlled until the load factor is smaller than a preset numerical value, so that the accurate control of the well opening of the plunger lifting system is realized, and once the load factor is smaller than the preset numerical value, the well opening of the plunger lifting system can be controlled, so that the intelligent control of the plunger lifting process for automatically judging the well opening time is realized.
For example, as summarized by a large amount of field data, a gas well can be successfully opened when the load factor is less than 0.5, otherwise, the gas well may cause bottom hole liquid accumulation after the opening. In this example, the preset value may be 0.5; the preset time period may be 10 minutes. Before the plunger lifting system opens the well, well closing sleeve pressure, well closing oil pressure and pipeline back pressure are read through a pressure sensor arranged in the plunger lifting system, and the load factor is automatically calculated through a load factor calculation program built in the plunger lifting system. And when the load factor is less than 0.5, sending a well opening signal to control the plunger lifting system to open the well. The mode of controlling the plunger lifting system to open the well can comprise the following steps: and controlling the pneumatic membrane valve to open the well. Otherwise, calculating the load factor every 10 minutes, and controlling the plunger lifting system to open the well until the load factor is less than 0.5.
In practice, there are various methods for calculating the load factor of the plunger lift system, for example, the method may include: calculating the load factor of the plunger lifting system according to the following formula:
in the embodiment, the load factor of the plunger lifting system can be calculated according to the obtained well closing casing pressure, the well closing oil pressure and the pipeline back pressure, and further the intelligent control that the plunger lifting process automatically judges the well opening time can be realized through the calculated load factor of the plunger lifting system.
In the embodiment, the formula is set through the use experience of the plunger lifting system in different work areas, so that the automatic judgment of the well opening time of the plunger lifting system is controlled.
When the method is specifically implemented, firstly, the measured instantaneous gas production at the wellhead position is obtained; and secondly, calculating the instantaneous critical liquid carrying flow of the plunger lifting system in real time. And when the instantaneous gas production is smaller than the instantaneous critical liquid carrying flow, controlling the plunger lifting system to close the well.
In embodiments, there are a variety of methods of obtaining the measured instantaneous gas production at the wellhead location, which may include, for example: an instantaneous gas production at a wellhead location measured by a two-phase flow meter pre-installed at the wellhead is obtained.
In the embodiment, in the well opening follow current stage of the plunger lifting system, firstly, the instantaneous gas production at the position of the wellhead is measured by installing the two-phase flow meter at the wellhead, so that the instantaneous gas production at the position of the wellhead can be obtained; and secondly, the instantaneous critical liquid carrying flow of the shale gas well is calculated, so that the control of the plunger lifting system to close the well in the subsequent steps is facilitated.
During specific implementation, after the instantaneous gas production rate at the measured wellhead position is obtained and the instantaneous critical liquid carrying flow of the plunger lifting system is calculated in real time, the plunger lifting system is controlled to close the well when the instantaneous gas production rate is smaller than the instantaneous critical liquid carrying flow.
In the embodiment, when the instantaneous gas production rate measured by the two-phase flow meter is lower than the instantaneous critical liquid carrying flow rate, a well closing signal can be generated and sent to the pneumatic membrane valve of the plunger lifting system, and the pneumatic membrane valve controls the plunger lifting system to close the well after receiving the well closing signal.
In the embodiment, by comparing the instantaneous gas production rate with the instantaneous critical liquid carrying flow rate, the intelligent control of the well closing time of the plunger lifting system can be realized, and the problems of ineffective well closing when the gas well can carry liquid, gas well production stopping caused by untimely liquid carrying and well closing and the like are prevented.
A specific example is given below to illustrate a specific application of the method of the present invention.
Fig. 3 is a specific example of a method for controlling a plunger lift system to open and close a well according to an embodiment of the present invention, and fig. 3 is a plunger lift system to which the method for opening and closing a well according to the embodiment of the present invention is applied. When the plunger lifting system is controlled to open the well, well closing sleeve pressure, well closing oil pressure and pipeline back pressure of the plunger lifting system are obtained; calculating the load factor of the plunger lifting system according to the obtained well shut-in casing pressure, well shut-in oil pressure and pipeline back pressure, and the preset correlation among the well shut-in casing pressure, the well shut-in oil pressure and the pipeline back pressure, for example, by a system program in the figure (a preset load factor calculation program in the plunger lifting system); when the load factor is smaller than a preset value, determining to control the plunger lifting system to open the well, and generating a well opening signal by the well opening signal; sending the well opening signal to a pneumatic membrane valve of a plunger lifting system; and the pneumatic membrane valve controls the plunger lifting system to open the well. When the plunger lifting system is controlled to close a well, firstly, the instantaneous gas production at the position of the well head measured by a two-phase flow meter preset at the well head is obtained; calculating the instantaneous critical liquid carrying flow of the plunger lifting system in real time; when the instantaneous gas production is smaller than the instantaneous critical liquid carrying flow, generating a well closing signal; sending the well closing signal to a pneumatic membrane valve of a plunger lifting system; and the pneumatic membrane valve controls the plunger lifting system to close the well.
Of course, it should be understood that there may be other variations to the above-described process, and all such variations are within the scope of the present invention.
In the embodiment of the invention, well closing sleeve pressure, well closing oil pressure and pipeline back pressure of a plunger lifting system are obtained; determining whether to control the plunger lifting system to open the well according to the acquired well closing casing pressure, the well closing oil pressure and the pipeline back pressure as well as the preset correlation among the well closing casing pressure, the well closing oil pressure and the pipeline back pressure; obtaining a measured instantaneous gas production at a wellhead location; calculating the instantaneous critical liquid carrying flow of the plunger lifting system in real time; when the instantaneous gas production is less than the instantaneous critical liquid carrying flow, the plunger lifting system is controlled to close the well, so that the automatic control of the switch well of the plunger lifting system can be realized, compared with the prior art, the problem that the gas well is stopped because of gas well liquid accumulation caused by incorrect selection of the switch well time is avoided, and the gas production efficiency of the plunger lifting system is improved.
As described above, the embodiment of the invention determines the well opening and closing time by matching the flow meter and the system program on the plunger lifting process and using the calculated load factor, realizes the intellectualization of the plunger lifting system on the basis of automatic control, can greatly reduce the gas well production stop problem caused by untimely well opening and closing, realizes the intelligent control of the plunger lifting process for automatically determining the well opening and closing time, reduces the gas well liquid accumulation production stop problem caused by invalid well opening and closing, improves the gas production efficiency of the plunger lifting process, and really realizes the low-cost and high-efficiency development of the shale gas well.
The embodiment of the invention also provides a device for controlling the plunger lifting system to open and close the well, which is described in the following embodiment. Because the principle of the device for solving the problems is similar to the method for controlling the plunger lifting system to open and close the well, the implementation of the device can refer to the implementation of the method for controlling the plunger lifting system to open and close the well, and repeated parts are not described again.
Fig. 4 is a schematic structural diagram of an apparatus for controlling a plunger lift system to open and close a well according to an embodiment of the present invention, and as shown in fig. 4, an apparatus for controlling a plunger lift system to open and close a well according to an embodiment of the present invention may include:
the information acquisition module 01 is used for acquiring the well closing casing pressure, the well closing oil pressure and the pipeline back pressure of the plunger lifting system;
the well opening control module 02 is used for determining whether to control the plunger lifting system to open a well according to the acquired well closing casing pressure, the well closing oil pressure and the pipeline back pressure as well as the preset correlation among the well closing casing pressure, the well closing oil pressure and the pipeline back pressure;
the instantaneous gas production measuring module 03 is used for obtaining the measured instantaneous gas production at the wellhead position;
the critical liquid carrying flow calculation module 04 is used for calculating the instantaneous critical liquid carrying flow of the plunger lifting system in real time;
and the well closing control module 05 is used for controlling the plunger lifting system to close the well when the instantaneous gas production is less than the instantaneous critical liquid carrying flow.
In one embodiment, the control well opening module is specifically configured to: calculating the load factor of the plunger lifting system according to the acquired well shut-in casing pressure, well shut-in oil pressure and pipeline back pressure as well as the preset correlation among the well shut-in casing pressure, the well shut-in oil pressure and the pipeline back pressure; the load factor is used for determining whether to control the plunger lifting system to open the well; and when the load factor is smaller than a preset value, determining to control the plunger lifting system to open the well.
In an embodiment, the apparatus for controlling a plunger lift system to open and close a well, as shown in fig. 5, according to an embodiment of the present invention, may further include: a repeat calculation module 06 for:
and when the load factor is larger than or equal to the preset numerical value, acquiring the well closing casing pressure, the well closing oil pressure and the pipeline back pressure again at preset time intervals, and recalculating the load factor of the plunger lifting system until the load factor is smaller than the preset numerical value.
In one embodiment, the control well opening module is specifically configured to: calculating the load factor of the plunger lifting system according to the following formula:
in one embodiment, the instantaneous gas production measurement module is specifically configured to: an instantaneous gas production at a wellhead location measured by a two-phase flow meter pre-installed at the wellhead is obtained.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the computer program to realize the method for controlling the plunger lifting system to open and close the well.
Embodiments of the present invention also provide a computer-readable storage medium storing a computer program for executing the method for controlling a plunger lift system to open and close a well.
In the embodiment of the invention, well closing sleeve pressure, well closing oil pressure and pipeline back pressure of a plunger lifting system are obtained; determining whether to control the plunger lifting system to open the well according to the acquired well closing casing pressure, the well closing oil pressure and the pipeline back pressure as well as the preset correlation among the well closing casing pressure, the well closing oil pressure and the pipeline back pressure; obtaining a measured instantaneous gas production at a wellhead location; calculating the instantaneous critical liquid carrying flow of the plunger lifting system in real time; when the instantaneous gas production is less than the instantaneous critical liquid carrying flow, the plunger lifting system is controlled to close the well, so that the automatic control of the switch well of the plunger lifting system can be realized, compared with the prior art, the problem that the gas well is stopped because of gas well liquid accumulation caused by incorrect selection of the switch well time is avoided, and the gas production efficiency of the plunger lifting system is improved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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 intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method of controlling a plunger lift system to open and close a well, comprising:
acquiring the shut-in casing pressure, the shut-in oil pressure and the pipeline back pressure of a plunger lifting system;
determining whether to control the plunger lifting system to open the well according to the acquired well closing casing pressure, the well closing oil pressure and the pipeline back pressure as well as the preset correlation among the well closing casing pressure, the well closing oil pressure and the pipeline back pressure;
obtaining a measured instantaneous gas production at a wellhead location;
calculating the instantaneous critical liquid carrying flow of the plunger lifting system in real time;
and when the instantaneous gas production is smaller than the instantaneous critical liquid carrying flow, controlling the plunger lifting system to close the well.
2. The method of claim 1, wherein determining whether to control the plunger lift system to open the well according to the acquired well shut-in casing pressure, well shut-in oil pressure and pipeline back pressure and the preset correlation relationship between the well shut-in casing pressure, the well shut-in oil pressure and the pipeline back pressure comprises:
calculating the load factor of the plunger lifting system according to the acquired well shut-in casing pressure, well shut-in oil pressure and pipeline back pressure as well as the preset correlation among the well shut-in casing pressure, the well shut-in oil pressure and the pipeline back pressure; the load factor is used for determining whether to control the plunger lifting system to open the well;
and when the load factor is smaller than the preset value, determining to control the plunger lifting system to open the well.
3. The method of claim 2, further comprising:
and when the load factor is larger than or equal to the preset value, acquiring the well closing casing pressure, the well closing oil pressure and the pipeline back pressure again at intervals of a preset time period, recalculating the load factor of the plunger lifting system, and determining to control the plunger lifting system to open the well until the load factor is smaller than a preset numerical value.
4. The method of claim 2, wherein the load factor of the plunger lift system is calculated as follows:
5. the method of claim 1, wherein obtaining a measured instantaneous gas production at a wellhead location comprises:
an instantaneous gas production at a wellhead location measured by a two-phase flow meter pre-installed at the wellhead is obtained.
6. An apparatus for controlling a plunger lift system to open and close a well, comprising:
the information acquisition module is used for acquiring the well closing sleeve pressure, the well closing oil pressure and the pipeline back pressure of the plunger lifting system;
the control well opening module is used for determining whether to control the plunger lifting system to open a well according to the acquired well closing casing pressure, the well closing oil pressure and the pipeline back pressure as well as the preset incidence relation among the well closing casing pressure, the well closing oil pressure and the pipeline back pressure;
the instantaneous gas production measuring module is used for obtaining the measured instantaneous gas production at the wellhead position;
the critical liquid carrying flow calculation module is used for calculating the instantaneous critical liquid carrying flow of the plunger lifting system in real time;
and the well closing control module is used for controlling the plunger lifting system to close the well when the instantaneous gas production is less than the instantaneous critical liquid carrying flow.
7. The apparatus of claim 6, wherein the control well opening module is specifically configured to: calculating the load factor of the plunger lifting system according to the acquired well shut-in casing pressure, well shut-in oil pressure and pipeline back pressure as well as the preset correlation among the well shut-in casing pressure, the well shut-in oil pressure and the pipeline back pressure; the load factor is used for determining whether to control the plunger lifting system to open the well; and when the load factor is smaller than a preset value, determining to control the plunger lifting system to open the well.
8. The apparatus of claim 7, further comprising a repetition calculation module to:
and when the load factor is larger than or equal to the preset numerical value, acquiring the well closing casing pressure, the well closing oil pressure and the pipeline back pressure again at preset time intervals, and recalculating the load factor of the plunger lifting system until the load factor is smaller than the preset numerical value.
9. 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 5 when executing the computer program.
10. 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 5.
Priority Applications (1)
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015101859A1 (en) * | 2013-12-31 | 2015-07-09 | Abb Technology Ltd. | Methods for improved plunger lift operation |
| CN105239967A (en) * | 2015-10-20 | 2016-01-13 | 中国石油天然气股份有限公司 | Automatic control method of plunger gas-lift liquid drainage production of oil-gas well |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015101859A1 (en) * | 2013-12-31 | 2015-07-09 | Abb Technology Ltd. | Methods for improved plunger lift operation |
| CN105239967A (en) * | 2015-10-20 | 2016-01-13 | 中国石油天然气股份有限公司 | Automatic control method of plunger gas-lift liquid drainage production of oil-gas well |
Non-Patent Citations (1)
| Title |
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| 刘华敏等: "涪陵页岩气田柱塞气举工艺研究与应用", 石油钻探技术, vol. 48, no. 3, pages 102 - 107 * |
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