CN113051698B - Method and system for determining closing time of intermittent gas well - Google Patents
Method and system for determining closing time of intermittent gas well Download PDFInfo
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Abstract
The invention provides a method and a system for determining the closing time of an intermittent gas well. The method for determining the well opening and closing time of the gas well comprises the following steps: generating casing pressure recovery coefficients of the current intermittent gas well according to the pre-acquired parameters of the current intermittent gas well; and determining the optimal well closing time of the current interval-opened gas well according to the casing pressure recovery coefficient of the current interval-opened gas well, the casing pressure of the current interval-opened gas well and the optimal well closing time standard chart corresponding to the current interval-opened gas well type. The invention can further give full play to the productivity of the intermittent gas well and improve the well opening time rate and the yield of the intermittent gas well.
Description
Technical Field
The invention relates to the technical field of gas reservoir engineering, in particular to a method and a system for determining the closing time of an intermittent gas well.
Background
The tight sandstone gas reservoir plays a significant role in natural gas reserves and is one of important resources for rapid development of natural gas. 5363A Su Lige gas field is a typical tight sandstone gas reservoir, the reservoir is tight, the heterogeneity is strong, with the continuous deepening of the development, the number of gas wells increases year by year, the low-yield gas well accounts for more than 60% and the proportion increases year by year. Most low producing gas wells are produced using an open system because they cannot be produced continuously. The reasonable intermittent production system can improve the well production time of the intermittent production gas well and give full play to the productivity of the gas well. The conventional method for determining the working time of the intermittent gas well mainly comprises a test method and a simulation method, wherein the test method is long in period, and the single well is regularly dispersed, so that the productivity of the intermittent gas well is influenced; the single-well mechanism model of the simulation method is difficult to actually depict an actual reservoir, the theoretical research result is difficult to accord with the reality, and the exertion of the capacity of the intermittent gas well is difficult to guarantee in the application process; both methods have certain limitations and have certain restrictions on the exertion of the production energy of the intermittent gas well. At present, the positioning of an intermittent gas well by each gas production unit in a Changqing gas area is different, so that great difference exists in the aspect of optimizing the intermittent system of the intermittent gas well; meanwhile, because the number of the spaced gas wells is large, each gas production unit mostly adopts an empirical method for the system of the spaced gas wells, the rationality of the gas production unit is not evaluated, and the method also has certain influence on the development of the productivity of the spaced gas wells.
Disclosure of Invention
The embodiment of the invention mainly aims to provide a method and a system for determining the well closing time of an interval-opened gas well, so as to give full play to the productivity of the interval-opened gas well and improve the well opening time rate and the yield of the interval-opened gas well.
In order to achieve the above object, an embodiment of the present invention provides a method for determining a well closing time of an intermittent gas well, including:
generating casing pressure recovery coefficients of the current interval-opened gas well according to the pre-acquired parameters of the current interval-opened gas well;
and determining the optimal well closing time of the current interval-opened gas well according to the casing pressure recovery coefficient of the current interval-opened gas well, the casing pressure of the current interval-opened gas well and the optimal well closing time standard chart corresponding to the current interval-opened gas well type.
An embodiment of the present invention further provides an abnormal energy interference attenuation system, including:
the casing pressure recovery coefficient unit is used for generating a casing pressure recovery coefficient of the current interval-opened gas well according to the pre-acquired current interval-opened gas well parameters;
and the first optimal well closing time unit is used for determining the optimal well closing time of the current interval-opened gas well according to the casing pressure recovery coefficient of the current interval-opened gas well, the casing pressure of the current interval-opened gas well and an optimal well closing time standard chart corresponding to the type of the current interval-opened gas well.
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 be run on the processor, wherein the processor executes the computer program to realize the step of the method for determining the open-close time of the gas well.
The embodiment of the invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to realize the steps of the method for determining the open-shut gas well closing time.
According to the method and the system for determining the open-top gas well closing time, the casing pressure recovery coefficient of the current open-top gas well is generated according to the current open-top gas well parameter which is obtained in advance, and then the optimal closing time of the current open-top gas well is determined according to the casing pressure recovery coefficient of the current open-top gas well, the casing pressure of the current open-top gas well and the optimal closing time standard chart corresponding to the current open-top gas well type, so that the productivity of the open-top gas well is further brought into full play, and the opening time rate and the yield of the open-top gas well are 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 will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for determining the time to close a gas well in a first embodiment of the present invention;
FIG. 2 is a flow chart of a method for determining the time to close a gas well in a second embodiment of the present invention;
FIG. 3 is a pressure recovery curve for an interval gas well;
FIG. 4 is a graph of the relationship between the well shut-in time and the recovery degree under different casing pressures when the casing pressure recovery coefficient a =0.8 of the interval gas well with poor reservoir physical properties in the embodiment of the invention;
FIG. 5 is a graph of the relationship between the shut-in time and the recovery degree under different casing pressures when the casing pressure recovery coefficient a =0.5 of the liquid accumulation interval open gas well in the embodiment of the invention;
FIG. 6 is a graph of the relationship between the shut-in time and the recovery degree at different casing pressures when the casing pressure recovery coefficient a =0.5 of a natural decreasing interval open gas well in the embodiment of the invention;
FIG. 7 is a chart of the optimal shut-in time criteria for opening a gas well between reservoir property differences in an embodiment of the invention;
FIG. 8 is a chart of the optimal shut-in time criteria for an effusion interburden gas well in an embodiment of the invention;
FIG. 9 is a graphical representation of the optimal shut-in time criteria for a natural diminishing interval gas well in an embodiment of the present invention;
fig. 10 is a block diagram of the structure of the intermediate gas well shut-in time determination system in the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be embodied as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
In view of the fact that the open-cut gas well closing time determined in the prior art influences the development of the open-cut gas well productivity, the embodiment of the invention provides a method for determining the open-cut gas well closing time, so that the optimal closing time is determined, the open-cut gas well productivity is further fully exerted, and the open-cut time rate and the open-cut gas well yield are improved. The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for determining the time to close an intermediate gas well according to a first embodiment of the present invention. As shown in fig. 1, the method for determining the open-interval gas well closing time includes:
s101: and generating casing pressure recovery coefficients of the current intermittent gas well according to the pre-acquired parameters of the current intermittent gas well.
Wherein, the current interval gas well parameters comprise: casing pressure, yield, natural gas dynamic viscosity, natural gas volume coefficient, reservoir permeability, reservoir effective thickness, natural gas relative density, average temperature of a static gas column of a shaft and average deviation coefficient of the static gas column of the shaft.
In specific implementation, the volume coefficient of the natural gas is obtained by the following method:
establishing a natural gas volume coefficient model; and inputting the acquired natural gas pressure parameter and the acquired natural gas temperature parameter into a natural gas volume coefficient model to obtain a natural gas volume coefficient.
Wherein the natural gas pressure parameters include: pressure at standard conditions, bottom hole pressure deviation factor, and initial bottom hole pressure. The natural gas temperature parameters include: bottom hole temperature and temperature at standard conditions.
The natural gas volume coefficient model is as follows:
B＝PscZiTi/pwsTsc；
wherein B is the volume coefficient of natural gas, PscIs the pressure under standard conditions, ZiAs a coefficient of bottom hole pressure deviation，TiIs the bottom hole temperature, pwsAt initial bottom hole pressure, TscIs the temperature under standard conditions.
S102: and determining the optimal well closing time of the current interval opened gas well according to the casing pressure recovery coefficient of the current interval opened gas well, the casing pressure of the current interval opened gas well and the optimal well closing time standard chart corresponding to the current interval opened gas well type.
In one embodiment, S102 includes: acquiring a plurality of sleeve pressure and optimal well closing time relation curves corresponding to sleeve pressure recovery coefficients from an optimal well closing time standard chart corresponding to the current open-top gas well type; determining a relation curve between casing pressure corresponding to the casing pressure recovery coefficient of the current interval-opened gas well and the optimal well closing time; and taking the optimal well closing time corresponding to the casing pressure of the current interval-opened gas well in the relation curve of the casing pressure and the optimal well closing time as the optimal well closing time of the current interval-opened gas well.
The main body of execution of the method for determining the closing time of the intermittent gas well shown in the figure 1 can be a computer. As can be seen from the flow shown in fig. 1, in the method for determining the open-top gas well shut-in time of the open-top gas well according to the embodiment of the invention, the casing pressure recovery coefficient of the current open-top gas well is calculated according to the parameters of the current open-top gas well, and then the optimal open-top time of the current open-top gas well is determined according to the optimal open-top time standard chart corresponding to the type of the current open-top gas well, the casing pressure recovery coefficient of the current open-top gas well and the casing pressure, so that the productivity of the open-top gas well is further fully exerted, and the open-top time and the yield of the open-top gas well are improved.
Fig. 2 is a flowchart of a method for determining the time to close an intermediate gas well according to a second embodiment of the present invention. As shown in fig. 2, before executing S101, the method further includes:
s201: and generating a relation curve of the well closing time and the recovery degree according to the well closing time and the casing pressure recovery degree under the casing pressure corresponding to the casing pressure recovery coefficient of each intermittent gas well.
The types of the intermittent gas wells are various, and the number of casing pressure recovery coefficients and the number of casing pressure are both multiple. Types of open gas wells may include: intermittent gas wells with poor physical properties of reservoirs, intermittent gas wells with accumulated liquid and intermittent gas wells with natural decrement.
S202: and determining the optimal well closing time under casing pressure corresponding to the casing pressure recovery coefficient of each intermittent gas well according to the relation curve of the well closing time and the recovery degree and the corresponding optimal recovery degree of the intermittent gas well.
S203: establishing an optimal well closing time standard chart of the corresponding intermittent gas well according to the optimal well closing time; the optimal well shut-in time standard chart comprises a relation curve of casing pressure and optimal well shut-in time corresponding to casing pressure recovery coefficients.
In one embodiment, S101 includes: establishing a casing pressure recovery coefficient model;
and inputting the current intermittent gas well parameters into a casing pressure recovery coefficient model to obtain a casing pressure recovery coefficient.
In one embodiment, the casing pressure recovery coefficient model is as follows:
wherein a is casing pressure recovery coefficient, q is yield, mu is natural gas dynamic viscosity, B is natural gas volume coefficient, K is reservoir permeability, h is reservoir effective thickness, and gamma isgIs the relative density of the natural gas,
is the average temperature of the wellbore gas still column,
and the average deviation coefficient of the static gas column of the shaft is obtained.
In specific implementation, the yield q can be an average value of the yields in a continuous production time period before closing the well; the natural gas dynamic viscosity mu can adopt a gas field average value, the reservoir permeability K can be obtained through a logging interpretation parameter, the reservoir effective thickness h can be obtained through the logging interpretation parameter, and the natural gas relative density gamma can be obtainedgThe average temperature of gas field and static gas column of well bore can be used
The average temperature of the original stratum and the average deviation coefficient of a static gas column of a shaft can be adopted
And the compression coefficient can be obtained according to a chart query.
The derivation process of the calculation formula of the casing pressure recovery coefficient is as follows:
FIG. 3 is a pressure recovery curve for an open gas well. As shown in FIG. 3, the abscissa of FIG. 3 is time in days (d); the ordinate is pressure in megapascals (MPa). As can be seen from fig. 3, the correlation between the casing pressure recovery curve and the bottom hole pressure recovery curve is good, and the bottom hole pressure can be analyzed instead of analyzing the casing pressure.
As shown in FIG. 3, assume that a well is producing at a constant production q for a period of time tpAfter closing the well, the bottom hole pressure (initial bottom hole pressure) p can be established when the well is closedwsThe equation of (c):
pws＝A′lnΔt+B′；
wherein p iswf(tp) Is tpBottom hole pressure at time, Δ t is shut-in time (recovery time), φ is porosity, CtTo synthesize the compression factor, rwIs the radius of the bottom hole and S is the skin factor.
Initial bottom hole pressure pwsAnd the sleeve pressure pcThe relation between the two is;
by combining the two equations, a relational expression of the sleeve pressure and the recovery time can be obtained:
pc＝alnΔt+b；
the specific process of the invention is as follows:
1. and generating a relation curve of the well closing time and the recovery degree according to the well closing time and the casing pressure recovery degree corresponding to the casing pressure recovery coefficient of each intermittent gas well.
Fig. 4 is a graph of the relationship between the well shut-in time and the recovery degree at different casing pressures when the casing pressure recovery coefficient a =0.8 of the gas well opened during the reservoir physical property difference in the embodiment of the invention. Fig. 5 is a graph of the relationship between the shut-in time and the recovery degree at different casing pressures when the casing pressure recovery coefficient a =0.5 of the liquid accumulation interval open gas well in the embodiment of the invention. Fig. 6 is a graph of the relationship between the shut-in time and the recovery degree at different casing pressures when the casing pressure recovery coefficient a =0.5 of the naturally decreasing interval open gas well in the embodiment of the invention. As shown in fig. 4-6, the abscissa of fig. 4-6 is time in days (d); the ordinate is the degree of recovery in percent (%).
2. And determining the optimal well closing time under casing pressure corresponding to the casing pressure recovery coefficient of each intermittent gas well according to the relation curve of the well closing time and the recovery degree and the corresponding optimal recovery degree of the intermittent gas well.
In specific implementation, the optimal recovery degree of each open gas well is different, and the corresponding recovery degree of each open gas well with the pressure recovery rate of 0.01MPa/d (namely the quotient of casing pressure and well closing time) can be taken as the optimal recovery degree of the open gas well; and the well closing time corresponding to the optimal recovery degree is the optimal well closing time.
As shown in fig. 4, the optimal recovery degree of the gas well opened between reservoir physical property differences is 85%, the corresponding optimal shut-in time is 6 days when the casing pressure is 8MPa, and the corresponding optimal shut-in time is 12 days when the casing pressure is 4 MPa; as shown in fig. 5, the optimal recovery degree of the liquid accumulation interval open gas well is 90%, the corresponding optimal shut-in time is 3 days when the casing pressure is 10MPa, and the corresponding optimal shut-in time is 7 days when the casing pressure is 6 MPa; as shown in fig. 6, the optimal recovery degree of the natural diminishing interval-opened gas well is 95%, the optimal shut-in time corresponding to the casing pressure of 5MPa is 9 days, and the optimal shut-in time corresponding to the casing pressure of 3MPa is 13 days.
3. Establishing an optimal well closing time standard chart of the corresponding intermittent gas well according to the optimal well closing time; the optimal well shut-in time standard chart comprises a relation curve of casing pressure and optimal well shut-in time corresponding to casing pressure recovery coefficients.
FIG. 7 is a chart of the optimal shut-in time criteria for developing a gas well between reservoir property differences in an embodiment of the present invention. FIG. 8 is a chart of the optimal shut-in time criteria for an effusion intervallic gas well in an embodiment of the invention. FIG. 9 is a graphical representation of the optimal shut-in time criteria for a natural diminishing interval gas well in an embodiment of the present invention. As shown in fig. 7-9, the abscissas of fig. 7-9 are both casing pressures in megapascals (MPa); the ordinate is the optimal shut-in time in days (d).
4. And inputting the obtained natural gas pressure parameter and the obtained natural gas temperature parameter into a natural gas volume coefficient model to obtain the natural gas volume coefficient.
5. And generating casing pressure recovery coefficients of the current intermittent gas well according to the pre-acquired parameters of the current intermittent gas well.
Wherein the casing pressure p in the current interval-opened gas well parametercWith initial bottom hole pressure pwsThe relationship of (a) to (b) is as follows:
pws＝1.27pc+0.29。
for example, a single well of a tight sandstone gas reservoir is put into production in 2008, and is currently in the interval stage, which is a natural diminishing interval gas well. The well has a dynamic viscosity of 0.000015m for natural gas2S; the reservoir permeability K is 0.0003D; the effective thickness h of the reservoir is 6m; bottom hole temperature Ti403.15K; natural gas relative density gammagIs 0.6; temperature T under standard conditionssc293.15K; pressure P under standard conditionsscIs 0.101MPa; the yield q is 2000m3D; casing pressure pc5MPa, bottom hole pressure deviation coefficient Zi0.95, average temperature of wellbore gas column
348.15K, average deviation coefficient of static gas column in well bore
Is 1.
From this, the natural gas volume coefficient B was 0.0198, and the casing pressure recovery coefficient a =0.3.
6. And determining the optimal well closing time of the current interval-opened gas well according to the casing pressure recovery coefficient of the current interval-opened gas well, the casing pressure of the current interval-opened gas well and the optimal well closing time standard chart corresponding to the current interval-opened gas well type.
For example, the standard chart of the optimal shut-in time corresponding to the natural diminishing spaced gas well is shown in fig. 9. And inquiring the optimal well closing time corresponding to the casing pressure of 5MPa when the a =0.3, and obtaining the optimal well closing time of the natural degressive interval-opened gas well as 9 days. With the implementation of the invention, the yield of the naturally degressive interval-opened gas well after the well is opened is increased by 2.05 times.
In summary, according to the method for determining the open-interval gas well shut-in time of the embodiment of the invention, the casing pressure recovery coefficient of the current open-interval gas well is generated according to the current open-interval gas well parameter which is obtained in advance, and then the optimal shut-in time of the current open-interval gas well is determined according to the casing pressure recovery coefficient of the current open-interval gas well, the casing pressure of the current open-interval gas well and the optimal shut-in time standard chart corresponding to the current open-interval gas well type, so that the productivity of the open-interval gas well is further brought into full play, and the open-interval gas well time and the yield of the open-interval gas well are improved. By implementing the method, the well opening time rate of the intermittent gas well is improved by nearly 10%, and the accumulated gas production is improved by 3%.
Based on the same inventive concept, the embodiment of the invention also provides a system for determining the well closing time of the intermittent gas well, and as the problem solving principle of the system is similar to that of the method for determining the well closing time of the intermittent gas well, the implementation of the system can refer to the implementation of the method, and repeated parts are not described again.
Fig. 10 is a block diagram of the structure of the intermediate gas well shut-in time determination system in the embodiment of the invention. As shown in fig. 10, the open-cut gas well closing time determining system includes:
the casing pressure recovery coefficient unit is used for generating a casing pressure recovery coefficient of the current interval-opened gas well according to the pre-acquired current interval-opened gas well parameters;
and the first optimal well closing time unit is used for determining the optimal well closing time of the current interval opened gas well according to the casing pressure recovery coefficient of the current interval opened gas well, the casing pressure of the current interval opened gas well and an optimal well closing time standard chart corresponding to the current interval opened gas well type.
In one embodiment, the method further comprises the following steps:
the curve generating unit is used for generating a relation curve of the well closing time and the recovery degree according to the well closing time and the casing pressure recovery degree under the casing pressure corresponding to the casing pressure recovery coefficient of each intermittent gas well;
the second optimal well closing time unit is used for determining the optimal well closing time under casing pressure corresponding to the casing pressure recovery coefficient of each type of the open gas well according to the relation curve of the well closing time and the recovery degree and the corresponding optimal recovery degree of the open gas well;
the standard chart establishing unit is used for establishing a corresponding optimal well closing time standard chart of the intermittent gas well according to the optimal well closing time; the optimal well shut-in time standard chart comprises a relation curve of casing pressure and optimal well shut-in time corresponding to casing pressure recovery coefficients.
In one embodiment, the first optimal shut-in time unit is specifically configured to:
acquiring a plurality of casing pressure and optimal well shut-in time relation curves corresponding to casing pressure recovery coefficients from an optimal well shut-in time standard chart corresponding to the current open gas well type;
determining a relation curve between casing pressure corresponding to the casing pressure recovery coefficient of the current interval-opened gas well and the optimal well closing time;
and taking the optimal well closing time corresponding to the casing pressure of the current interval-opened gas well in the relation curve of the casing pressure and the optimal well closing time as the optimal well closing time of the current interval-opened gas well.
To sum up, the open gas well shut-in time determining system of the embodiment of the invention firstly generates the casing pressure recovery coefficient of the current open gas well according to the current open gas well parameter obtained in advance, and then determines the optimal shut-in time of the current open gas well according to the casing pressure recovery coefficient of the current open gas well, the casing pressure of the current open gas well and the optimal shut-in time standard chart corresponding to the current open gas well type, so as to further give full play to the productivity of the open gas well and improve the open gas well time and yield of the open gas well.
An embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor may implement all or part of the contents of the method for determining a gas well opening/closing time when executing the computer program, for example, the following contents may be implemented when the processor executes the computer program:
generating casing pressure recovery coefficients of the current intermittent gas well according to the pre-acquired parameters of the current intermittent gas well;
and determining the optimal well closing time of the current interval-opened gas well according to the casing pressure recovery coefficient of the current interval-opened gas well, the casing pressure of the current interval-opened gas well and the optimal well closing time standard chart corresponding to the current interval-opened gas well type.
To sum up, the computer equipment of the embodiment of the invention generates the casing pressure recovery coefficient of the current spaced gas well according to the pre-acquired current spaced gas well parameter, and then determines the optimal well closing time of the current spaced gas well according to the casing pressure recovery coefficient of the current spaced gas well, the casing pressure of the current spaced gas well and the optimal well closing time standard chart corresponding to the current spaced gas well type, so as to further give full play to the productivity of the spaced gas well and improve the well opening time rate and the yield of the spaced gas well.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, may implement all or part of the contents of the method for determining a time to open a gas well, for example, when the processor executes the computer program, the following contents may be implemented:
generating casing pressure recovery coefficients of the current interval-opened gas well according to the pre-acquired parameters of the current interval-opened gas well;
and determining the optimal well closing time of the current interval-opened gas well according to the casing pressure recovery coefficient of the current interval-opened gas well, the casing pressure of the current interval-opened gas well and the optimal well closing time standard chart corresponding to the current interval-opened gas well type.
To sum up, the computer-readable storage medium of the embodiment of the invention generates the casing pressure recovery coefficient of the current spaced gas well according to the pre-acquired current spaced gas well parameter, and then determines the optimal well closing time of the current spaced gas well according to the casing pressure recovery coefficient of the current spaced gas well, the casing pressure of the current spaced gas well and the optimal well closing time standard chart corresponding to the current spaced gas well type, so as to further give full play to the productivity of the spaced gas well and improve the well opening time rate and the yield of the spaced gas well.
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.
Those of skill in the art will further appreciate that the various illustrative logical blocks, units, and steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate the interchangeability of hardware and software, various illustrative components, elements, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present embodiments.
The various illustrative logical blocks, or units, or devices described in connection with the embodiments disclosed herein may be implemented or performed with a general purpose processor, a digital signal processor, an Application Specific Integrated Circuit (ASIC), a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, a storage medium may be coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC, which may be located in a user terminal. In the alternative, the processor and the storage medium may reside in different components in a user terminal.
In one or more exemplary designs, the functions described above in connection with the embodiments of the invention may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media that facilitate transfer of a computer program from one place to another. Storage media may be any available media that can be accessed by a general purpose or special purpose computer. For example, such computer-readable media can comprise, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store program code in the form of instructions or data structures and that can be read by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Additionally, any connection is properly termed a computer-readable medium, and, thus, is included if the software is transmitted from a website, server, or other remote source via a coaxial cable, fiber optic cable, twisted pair, digital Subscriber Line (DSL), or wirelessly, e.g., infrared, radio, and microwave. Such discs (disk) and disks (disc) include compact disks, laser disks, optical disks, DVDs, floppy disks and blu-ray disks where disks usually reproduce data magnetically, while disks usually reproduce data optically with lasers. Combinations of the above may also be included in the computer-readable medium.
Claims (4)
1. A method for determining the well closing time of a gas well is characterized by comprising the following steps:
generating casing pressure recovery coefficients of the current intermittent gas well according to the pre-acquired parameters of the current intermittent gas well;
determining the optimal well closing time of the current interval-opened gas well according to the casing pressure recovery coefficient of the current interval-opened gas well, the casing pressure of the current interval-opened gas well and the optimal well closing time standard chart corresponding to the current interval-opened gas well type;
wherein, still include:
generating a relation curve of the well closing time and the recovery degree according to the well closing time and the casing pressure recovery degree under the casing pressure corresponding to the casing pressure recovery coefficient of each intermittent gas well;
determining the optimal well closing time under casing pressure corresponding to the casing pressure recovery coefficient of each intermittent gas well according to the relation curve of the well closing time and the recovery degree and the corresponding optimal recovery degree of the intermittent gas well;
establishing an optimal well closing time standard chart of the corresponding intermittent gas well according to the optimal well closing time; the optimal well shut-in time standard chart comprises a relation curve of casing pressure and optimal well shut-in time corresponding to casing pressure recovery coefficients;
wherein determining the optimal shut-in time for the current spaced-open gas well comprises:
acquiring a plurality of casing pressure and optimal well shut-in time relation curves corresponding to casing pressure recovery coefficients from an optimal well shut-in time standard chart corresponding to the current open gas well type;
determining a relation curve between casing pressure corresponding to the casing pressure recovery coefficient of the current intermittent gas well and the optimal well closing time;
taking the optimal well closing time corresponding to the casing pressure of the current interval-opened gas well in the relation curve of the casing pressure and the optimal well closing time as the optimal well closing time of the current interval-opened gas well;
wherein the current interval gas well parameters comprise: natural gas volume factor; the method for determining the well closing time of the intermittent gas well further comprises the following steps:
establishing a natural gas volume coefficient model;
inputting the obtained natural gas pressure parameter and natural gas temperature parameter into the natural gas volume coefficient model to obtain a natural gas volume coefficient;
the method for generating the casing pressure recovery coefficient of the current intermittent gas well according to the pre-acquired current intermittent gas well parameters comprises the following steps:
establishing a casing pressure recovery coefficient model;
and inputting the current interval open gas well parameters into the casing pressure recovery coefficient model to obtain the casing pressure recovery coefficient.
2. An open gas well shut-in time determination system, comprising:
the casing pressure recovery coefficient unit is used for generating the casing pressure recovery coefficient of the current interval-opened gas well according to the pre-acquired current interval-opened gas well parameters;
the first optimal well closing time unit is used for determining the optimal well closing time of the current interval-opened gas well according to the casing pressure recovery coefficient of the current interval-opened gas well, the casing pressure of the current interval-opened gas well and an optimal well closing time standard chart corresponding to the type of the current interval-opened gas well;
wherein the system further comprises:
the curve generating unit is used for generating a relation curve of the well closing time and the recovery degree according to the well closing time and the casing pressure recovery degree under the casing pressure corresponding to the casing pressure recovery coefficient of each intermittent gas well;
the second optimal well closing time unit is used for determining the optimal well closing time under casing pressure corresponding to the casing pressure recovery coefficient of each open gas well according to the relation curve of the well closing time and the recovery degree and the corresponding optimal recovery degree of the open gas well;
the standard chart establishing unit is used for establishing a corresponding optimal well closing time standard chart of the intermittent gas well according to the optimal well closing time; the optimal well closing time standard chart comprises a relation curve of casing pressure and optimal well closing time corresponding to the casing pressure recovery coefficient;
wherein the first optimal shut-in time unit is specifically configured to:
acquiring a plurality of casing pressure and optimal well shut-in time relation curves corresponding to casing pressure recovery coefficients from an optimal well shut-in time standard chart corresponding to the current open gas well type;
determining a relation curve between casing pressure corresponding to the casing pressure recovery coefficient of the current intermittent gas well and the optimal well closing time;
taking the optimal well closing time corresponding to the casing pressure of the current interval-opened gas well in the relation curve of the casing pressure and the optimal well closing time as the optimal well closing time of the current interval-opened gas well;
wherein the current interval gas well parameters comprise: natural gas volume factor; the method for determining the well closing time of the intermittent gas well further comprises the following steps:
establishing a natural gas volume coefficient model;
inputting the obtained natural gas pressure parameter and natural gas temperature parameter into the natural gas volume coefficient model to obtain a natural gas volume coefficient;
the method for generating the casing pressure recovery coefficient of the current intermittent gas well according to the pre-acquired current intermittent gas well parameters comprises the following steps:
establishing a casing pressure recovery coefficient model;
and inputting the current interval open gas well parameters into the casing pressure recovery coefficient model to obtain the casing pressure recovery coefficient.
3. 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 for determining the open-hole gas well shut-in time of claim 1 when executing the computer program.
4. A computer-readable storage medium on which a computer program is stored, wherein the computer program, when executed by a processor, implements the method for determining the shut-in time of a gas well according to claim 1.
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