CN115126456A - Condensate gas reservoir gas injection parameter optimization method and device - Google Patents
Condensate gas reservoir gas injection parameter optimization method and device Download PDFInfo
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Abstract
The application belongs to the technical field of oil and gas development, and particularly provides a condensate gas reservoir gas injection parameter optimization method and device, wherein a separator degassed oil sample and a well casing gas sample in a condensate gas reservoir environment are collected to prepare a condensate oil sample; performing analog simulation on the condensate gas reservoir environment based on the condensate oil sample, and performing multiple times of dry gas injection treatment on a simulation environment obtained by analog simulation; recording the oil-gas state of the simulation environment before and after each injection treatment, and constructing a corresponding relation between the injection treatment times and the oil-gas state; and determining the dry gas injection times of the condensate gas reservoir environment according to the corresponding relation. The scheme provided by the invention solves the problems of complex operation process and inaccurate parameters of gas injection parameter determination according to actual operation experience, improves the acquisition efficiency and accuracy of optimal gas injection times, and improves the dredging effect of an oil-gas seepage channel.
Description
Technical Field
The invention relates to the technical field of oil and gas development, in particular to a condensate gas reservoir gas injection parameter optimization method and device.
Background
After hydrocarbon gas under the conditions of high temperature and high pressure in the underground depth is produced to the ground, liquid petroleum can be condensed due to the reduction of temperature and pressure, the liquid light oil is condensate oil, and the gas reservoir is a condensate gas reservoir. Condensate gas reservoirs containing high-saturation condensate oil accumulate in a near-wellbore area, so that oil and gas seepage channels are easily blocked, and the oil and gas production efficiency is seriously influenced. How to solve the problem that the condensate gas reservoir blocks an oil-gas seepage channel so as to avoid influencing the normal operation of an oil-gas well becomes an important subject facing the oil-gas exploitation industry.
At present, dry gas without condensate oil is generally adopted in the industry as an injection agent of a condensate gas reservoir to dredge a near-wellbore region oil gas seepage channel, wherein gas injection into the condensate gas reservoir firstly needs to determine gas injection parameters, particularly gas injection times.
However, the gas injection parameters of the existing method are usually determined according to the practical gas injection operation experience, not only the operation process is complicated, but also the determined parameters are inaccurate, and the dredging efficiency of the oil-gas seepage channel is seriously influenced.
Disclosure of Invention
The invention provides a condensate gas reservoir gas injection parameter optimization method and device, which can be used for obtaining the optimal gas injection times in a condensate gas reservoir simulation environment, avoiding the problems of complex operation process and inaccurate parameters when determining the gas injection times according to actual operation experience, and improving the dredging efficiency of an oil-gas seepage channel.
In a first aspect, an embodiment of the present invention provides a condensate gas reservoir gas injection parameter optimization method, including:
collecting a separator degassed oil sample and a well casing gas sample in a condensate gas reservoir environment to prepare a condensate oil sample;
performing analog simulation on the condensate gas reservoir environment based on the condensate oil sample, and performing multiple times of dry gas injection treatment on a simulation environment obtained by analog simulation;
recording the oil-gas state of the simulation environment before and after each injection treatment, and constructing a corresponding relation between the injection treatment times and the oil-gas state;
and determining the dry gas injection times of the condensate gas reservoir environment according to the corresponding relation.
In an alternative embodiment, the simulation of the condensate gas reservoir environment based on the condensate oil sample includes:
performing a constant volume failure experiment on a condensate oil sample based on an oil-gas reservoir fluid physical property analysis method to obtain simulation environment parameters;
and constructing a simulation environment of the condensate gas reservoir according to the simulation environment parameters.
Further, the simulated environmental parameters include maximum condensate saturation, condensate volume, and ambient pressure.
In an alternative embodiment, the injection processing of the dry gas is performed any one of a plurality of times of injection processing of the dry gas into a simulation environment obtained by simulation, and the injection processing includes:
injecting dry gas into the simulation environment until the volume of the condensate oil sample in the simulation environment is within a preset volume range;
when the condensate oil sample in the simulation environment is fully mixed with the injected dry gas, carrying out environmental pressure adjustment on the current simulation environment;
and analyzing the components of the condensate oil sample and the mixed gas in the simulation environment with the environment pressure adjusted to obtain the saturation of the condensate oil sample and the oil content and the gas content of the mixed gas.
In an alternative embodiment, the oil-gas state comprises the volume of the condensate sample before and after the environmental pressure is regulated, the saturation of the condensate sample, and the oil content and the gas content of the mixed gas.
In an optional embodiment, the determining, according to the correspondence, the number of times of dry gas injection into the condensate gas reservoir environment includes:
acquiring a condensate oil state in the condensate gas reservoir environment; wherein the condensate condition includes condensate saturation and condensate volume;
and determining the optimal dry gas injection times from the corresponding relation according to the condensate oil state, so as to perform dry gas injection treatment on the condensate gas reservoir environment.
In a second aspect, an embodiment of the present invention provides a condensate gas reservoir gas injection parameter optimization apparatus, including: the device comprises acquisition equipment, a PVT analyzer, injection equipment, analysis equipment and computing equipment;
the collecting device is used for collecting a separator degassed oil sample and a well casing gas sample in a condensate gas reservoir environment to prepare a condensate oil sample;
the PVT analyzer is used for performing simulation on the condensate gas reservoir environment based on the condensate oil sample;
the injection equipment is used for performing multiple times of dry gas injection treatment on a simulation environment obtained by simulation;
the analysis equipment is used for analyzing the components of the condensate oil sample and the mixed gas in the simulation environment for adjusting the environmental pressure;
the computing equipment is used for recording the oil-gas state of the simulation environment before and after each injection treatment, and establishing the corresponding relation between the injection treatment times and the oil-gas state; and determining the dry gas injection times of the condensate gas reservoir environment according to the corresponding relation.
In an optional embodiment, the PVT analyzer is specifically configured to perform a constant volume depletion experiment on a condensate sample based on an oil and gas reservoir fluid physical property analysis method to obtain a simulated environmental parameter; and constructing a simulation environment of the condensate gas reservoir according to the simulation environment parameters.
In an optional embodiment, the injection device is specifically configured to inject dry gas into the simulation environment until the volume of the condensate sample in the simulation environment reaches a preset volume range; and when the condensate oil sample in the simulation environment is fully mixed with the injected dry gas, adjusting the environmental pressure of the current simulation environment.
In an alternative embodiment, the computing device is specifically configured to obtain a condensate state in the condensate gas reservoir environment; wherein the condensate condition comprises condensate saturation and condensate volume; and determining the optimal dry gas injection times from the corresponding relation according to the condensate oil state, so as to perform dry gas injection treatment on the condensate gas reservoir environment.
The invention provides a condensate gas reservoir gas injection parameter optimization method and a device, wherein a separator degassed oil sample and a well casing gas sample under a condensate gas reservoir environment are collected to prepare a condensate oil sample; performing analog simulation on the condensate gas reservoir environment based on the condensate oil sample, and performing multiple times of dry gas injection treatment on a simulation environment obtained by analog simulation; recording the oil-gas state of the simulation environment before and after each injection treatment, and constructing a corresponding relation between the injection treatment times and the oil-gas state; and determining the dry gas injection times of the condensate gas reservoir environment according to the corresponding relation. Compared with the prior art, the scheme provided by the invention can be used for performing analog simulation on the actual condensate gas reservoir environment so as to ensure the similarity between the simulation environment and the actual environment, so that the data obtained by gas injection treatment is more accurate, the oil-gas state is obtained by performing dry gas injection treatment on the simulation environment for multiple times, the corresponding relation between the injection treatment times and the oil-gas state is established, the optimal gas injection times are determined according to the corresponding relation, the optimal gas injection times are obtained in the condensate gas reservoir simulation environment, the problems of complex operation process and inaccurate parameters in determining the gas injection times according to actual operation experience are solved, and the dredging efficiency of an oil-gas seepage channel is improved.
It should be understood that what is described in the summary above is not intended to limit key or critical features of embodiments of the invention, nor is it intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a scenario architecture upon which the present disclosure is based;
FIG. 2 is a flow chart of a condensate gas reservoir gas injection parameter optimization method provided by an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a condensate gas reservoir gas injection parameter optimization device according to an embodiment of the present disclosure.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more complete and thorough understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
In the operation process of the oil-gas well, if a condensate gas reservoir with high saturation is accumulated in a near wellbore area, the oil-gas seepage passage is blocked, the flowing performance of oil gas is influenced, and the productivity of the oil-gas well is reduced.
At present, a plurality of oil and gas wells adopt a method of injecting dry gas into a condensate gas reservoir to dredge an oil and gas seepage channel, when the oil and gas seepage channel is blocked, a large amount of dry gas is injected into the condensate gas reservoir to extract and displace condensate oil in the condensate gas reservoir, so that the saturation of the condensate oil in the condensate gas reservoir is reduced, the oil and gas flowing performance of a near-well zone is improved, and the aim of dredging the oil and gas seepage channel is fulfilled,
however, the gas injection parameters of the existing method are usually determined according to the experience of actual gas injection operation, and the method needs a large amount of actual operation to determine the gas injection parameters, so that not only is the operation process complicated, but also the determined parameters are inaccurate, and the dredging efficiency of the oil-gas seepage channel is seriously influenced.
In order to solve the problems, the inventor researches and discovers that the operation process of the method for determining the gas injection parameters by adopting a large amount of actual operation is too complex and the determined gas injection parameters are inaccurate, so that the actual condensate gas reservoir environment can be simulated to obtain a simulated environment, the simulated environment is similar to the actual environment as much as possible, a plurality of gas injection experiments are carried out in the simulated environment, and the gas injection times for injecting the actual condensate gas reservoir environment are determined according to the experimental data obtained by each gas injection experiment. Therefore, the condensate gas reservoir gas injection parameter optimization method provided by the invention can be used for performing simulation on the actual condensate gas reservoir environment to ensure the similarity between the simulation environment and the actual environment, so that the data obtained by gas injection treatment is more accurate, the oil gas state is obtained by performing dry gas injection treatment on the simulation environment for multiple times, the corresponding relation between the injection treatment times and the oil gas state is established, the optimal gas injection times are determined according to the corresponding relation, the optimal gas injection times are obtained under the condensate gas reservoir simulation environment, the problems of complex operation process and inaccurate parameters when the gas injection times are determined according to actual operation experience are solved, and the dredging efficiency of an oil gas seepage channel is improved.
Fig. 1 is a schematic diagram of a scenario architecture on which the present disclosure is based, and as shown in fig. 1, a scenario architecture on which the present disclosure is based may include a condensate gas reservoir gas injection parameter optimization apparatus 1 and a gas injection apparatus 2.
Wherein, condensate gas reservoir gas injection parameter optimization equipment 1 is the set of all equipment that can simulate actual condensate gas reservoir environment, includes: PVT analyzers, injection pumps, separators, gas chromatographs, computing equipment, etc., which are not subject to any particular limitation herein, may be used to perform the condensate gas reservoir gas injection parameter optimization methods described in the various embodiments described below.
The gas injection apparatus 2 is a collection of all apparatuses capable of performing a gas injection process into the condensate gas reservoir, including a gas injection pump, a back pressure pump, and the like, and is not limited in any way.
Particularly, condensate gas deposit gas injection parameter optimizing apparatus 1 can with 2 communication connection of gas injection equipment, send the gas injection parameter that analog simulation obtained to gas injection equipment 2, gas injection equipment 2 carries out the gas injection according to the gas injection parameter of receiving to the condensate gas deposit and handles, dredges obstructed oil gas seepage flow passageway.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Example one
Fig. 2 is a flowchart of a condensate gas reservoir gas injection parameter optimization method according to an embodiment of the present disclosure, and as shown in fig. 2, an implementation subject of the embodiment is a condensate gas reservoir gas injection parameter optimization apparatus, and the condensate gas reservoir gas injection parameter optimization method according to the embodiment of the present disclosure includes:
and S21, collecting a separator degassed oil sample and a well casing gas sample under the condensate gas reservoir environment to prepare a condensate oil sample.
The condensate gas reservoir is an important special oil gas reservoir type between an oil reservoir and a natural gas reservoir, the condensate gas reservoir exists in a gas form at the original formation temperature and pressure, the formation pressure is continuously reduced in the development process, heavy hydrocarbon in the condensate gas reservoir can be subjected to phase change, condensate oil is separated out from the formation, and a gas-liquid two-phase is formed.
Because the operation process of injecting gas in the actual condensate gas reservoir environment is very complicated, simulation of the condensate gas reservoir environment is performed in the embodiment to simplify the operation process, and the condensate oil sample is required to be prepared to simulate the condensate oil in the actual environment when simulation of the condensate gas reservoir environment is performed.
In this embodiment, the separator degassed oil sample and the well casing gas sample in the actual condensate gas reservoir environment are collected as raw materials for configuring the condensate oil sample, the two samples can be mixed in a special device according to a specific ratio to obtain the condensate oil sample, and the condensate oil sample can be used for simulating the actual condensate gas reservoir environment.
For example, the formation temperature of a condensate reservoir of an oil and gas well is 140.6 ℃, the dew point pressure is 55.4MPa, and the condensate content is 533g/m3, a condensate sample is prepared for the condensate reservoir of the oil and gas well, a separator degassing oil sample and a well casing gas sample under the environment of the condensate reservoir are collected and configured according to the condensate content of 533g/m3, the formation temperature of 140.6 ℃, and the dew point pressure of 55.4MPa, so as to obtain the condensate sample.
And S22, performing simulation on the condensate gas reservoir environment based on the condensate oil sample, and performing multiple dry gas injection treatment on the simulation environment obtained by simulation.
Because the simulation of the condensate gas reservoir environment requires not only a condensate oil sample but also simulation environment parameters, the simulation environment of the condensate gas reservoir can be constructed, and gas injection parameters are determined by injecting gas into the simulation environment.
In this embodiment, after the condensate sample is configured, the condensate sample is processed according to an oil and gas reservoir fluid physical property analysis method, a simulation environment parameter is determined, a simulation environment of the condensate gas reservoir is further constructed according to the simulation environment parameter, and finally, dry gas injection processing is performed on the constructed simulation environment of the condensate gas reservoir for multiple times, so as to determine a corresponding relationship between gas injection times and a gas injection effect, and thus determine optimal gas injection times.
And S23, recording the oil-gas state of the simulation environment before and after each injection treatment, and constructing the corresponding relation between the injection treatment times and the oil-gas state.
The oil gas state refers to oil sample information and gas sample information in a simulation environment, and can reflect the effect of gas injection treatment.
In this embodiment, the oil-gas state after the previous gas injection treatment is the oil-gas state before the next gas injection treatment, and the corresponding oil-gas state can be obtained for the simulated environment gas injection treatment every time.
And S24, determining the dry gas injection frequency of the condensate gas reservoir environment according to the corresponding relation.
After the injection frequency reaches a certain number, the state of the condensate gas reservoir tends to be stable, the dredging effect of the oil gas seepage channel cannot be improved even if gas injection is continued, and the dredging effect of the oil gas seepage channel reaches the best at the moment, so that the optimal dry gas injection frequency needs to be determined.
In this embodiment, the oil-gas state in the actual condensate gas reservoir environment is obtained, the corresponding oil-gas state in the simulation environment is determined through conversion with the simulation environment, and the dry gas injection frequency corresponding to the optimal gas injection effect is determined from the correspondence between the injection frequency and the oil-gas state, so as to perform gas injection treatment on the actual condensate gas reservoir environment.
The embodiment provides a condensate gas reservoir gas injection parameter optimization method, which comprises the steps of collecting a separator degassed oil sample and a well casing gas sample in a condensate gas reservoir environment to prepare a condensate oil sample; performing analog simulation on the condensate gas reservoir environment based on the condensate oil sample, and performing multiple times of dry gas injection treatment on a simulation environment obtained by analog simulation; recording the oil-gas state of the simulation environment before and after each injection treatment, and constructing a corresponding relation between the injection treatment times and the oil-gas state; and determining the dry gas injection times of the condensate gas reservoir environment according to the corresponding relation. The condensate gas reservoir gas injection parameter optimization method provided by the embodiment can perform simulation on an actual condensate gas reservoir environment to ensure the similarity between a simulation environment and the actual environment, so that the data obtained by gas injection processing is more accurate, an oil-gas state is obtained by performing dry gas injection processing for multiple times in the simulation environment, a corresponding relation between the injection processing times and the oil-gas state is established, and then the optimal gas injection times are determined according to the corresponding relation, so that the optimal gas injection times are obtained in the condensate gas reservoir simulation environment, the problems of complex operation process and inaccurate parameters of determining the gas injection times according to actual operation experience are avoided, and the dredging efficiency of an oil-gas seepage channel is improved.
On the basis of the above embodiment, in order to accurately simulate and simulate the actual condensate gas reservoir environment, in an optional implementation manner, the condensate gas reservoir gas injection parameter optimization device uses an oil and gas reservoir fluid physical property analysis method to process a condensate oil sample so as to simulate an oil and gas state in the actual condensate gas reservoir environment and obtain corresponding environmental parameters to construct a simulated environment of the condensate gas reservoir, so that the simulated environment is as similar as possible to the actual environment, and the accuracy of data obtained from the simulated environment is ensured.
Because the constant volume failure experiment is performed for simulating the exploitation process that the hydrocarbon storage space of the condensate gas reservoir is kept unchanged and gradually reduced in pressure, the state of the condensate gas reservoir blocking an oil-gas seepage channel can be simulated through the constant volume failure experiment, and the simulation environment parameters at the moment are obtained.
In the embodiment, after the condensate oil sample is configured, the condensate gas reservoir gas injection parameter optimization device performs a constant volume failure experiment on the condensate oil sample based on a physical property analysis mode of an oil and gas reservoir fluid to obtain a simulation environment parameter; and constructing a simulation environment of the condensate gas reservoir according to the simulation environment parameters.
Wherein the simulation environment parameters comprise maximum condensate saturation, condensate volume and environment pressure.
For example, the configured condensate sample is placed in a first container, a constant volume depletion experiment is performed in the first container, the process that the formation pressure is simulated to be reduced continuously, the phase change of heavy hydrocarbon in a condensate gas reservoir occurs, and the condensate is separated out in the formation is simulated, and finally the maximum condensate saturation is 23.231%, the condensate volume is 122.068ml, and the environmental pressure is 30.936 MPa. And adding a condensate oil sample into the second container according to the maximum condensate oil saturation of 23.231% and the condensate oil volume of 122.068ml, and adjusting the pressure in the second container to the environmental pressure of 30.936MPa, so that the condensate gas reservoir environment is simulated in the second container to obtain a simulated environment.
It should be noted that the first container and the second container may be PVT cartridges, and are not limited herein.
On the basis of a simulation environment obtained by simulation, dry gas injection treatment in an actual condensate gas reservoir environment can be simulated by injecting dry gas into the simulation environment for multiple times, and composition analysis is performed on mixed gas after the dry gas is injected to determine the effect of gas injection treatment, wherein the dry gas injection mode to the simulation environment every time is the same.
That is, after the dry gas is injected into the simulation environment, the composition analysis of the mixed gas is required to determine the effect of the injected dry gas.
Specifically, after a simulation environment of a condensate gas reservoir is constructed, any one of a plurality of times of dry gas injection processes is performed on the simulation environment obtained by simulation, and the injection processes include: injecting dry gas into the simulation environment until the volume of the condensate oil sample in the simulation environment is within a preset volume range; when the condensate oil sample in the simulation environment is fully mixed with the injected dry gas, adjusting the environmental pressure of the current simulation environment; and analyzing the components of the condensate oil sample and the mixed gas in the simulation environment with the environment pressure adjusted to obtain the saturation of the condensate oil sample and the oil content and the gas content of the mixed gas.
For example, the preset volume range is 1.1-1.3 times of the volume of the condensate, and is as close to 1.2 times as possible, dry gas is injected into the simulation environment for the first time, so that the volume of the condensate sample in the simulation environment is from 122.068ml to 146.246ml, the environmental pressure is changed from 30.936MPa to 38.670MPa, the condensate sample in the simulation environment and the injected dry gas are fully mixed, the environmental pressure is restored from 38.670MPa to 30.936MPa, the condensate sample and the mixed gas in the simulation environment with the regulated environmental pressure are subjected to composition analysis, and the saturation of the condensate sample is 21.831%, and the oil content of the mixed gas is 0.085g and the gas content of 5094ml are obtained. And (4) repeatedly performing dry gas injection, pressure regulation and component analysis according to the same mode to obtain the saturation of the condensate oil sample and the oil content and the gas content of the mixed gas after multiple gas injection treatments.
Because the oil-gas state information can reflect the gas injection treatment effect, and the oil-gas state comprises the volume of the condensate sample before and after the environmental pressure is adjusted, the saturation of the condensate sample, and the oil content and the gas content of the mixed gas, the incidence relation between the gas injection effect and the injection treatment frequency can be better determined by establishing the corresponding relation between the injection treatment frequency and the oil-gas state.
In this embodiment, the oil-gas state of the simulation environment before and after each injection processing is recorded, the correspondence between the number of injection processing and the oil-gas state is established according to the data recorded in the foregoing steps, the content and format of the correspondence are not fixed, and the correspondence between the data can be correctly represented.
For example, 5 times of dry gas injection is performed in the simulation environment, the oil-gas state of the simulation environment before and after 5 times of injection treatment is recorded, table 1 is constructed, table 1 is a table of correspondence between the number of injection treatment times and the oil-gas state in the simulation environment, and as shown in table 1, the relationship between the number of injection treatment times and the oil-gas state in the simulation environment can be determined according to table 1.
TABLE 1
Wherein the condensate density is 0.7529g/cm3, the expansion calculation formula is (sample volume after injection-sample volume after discharge)/sample volume after discharge, and the produced gas-oil ratio calculation formula is gas production/(oil production/condensate density).
After the corresponding relation between the injection treatment times and the oil gas state is established, the dry gas injection times to the condensate gas reservoir environment can be determined according to the corresponding relation.
In this embodiment, a condensate state in the condensate reservoir environment is obtained; wherein the condensate condition comprises condensate saturation and condensate volume; and determining the optimal dry gas injection times from the corresponding relation according to the condensate oil state, so as to perform dry gas injection treatment on the condensate gas reservoir environment.
For example, the condensate saturation and the condensate volume in an actual condensate gas reservoir environment are obtained, and the condensate sample saturation and the condensate volume in the corresponding simulation environment are 23.231% and 122.068ml through conversion with the simulation environment, and from the correspondence between the number of injection treatments and the oil gas state shown in the foregoing table 1, it can be found that the condensate saturation and the produced gasoline ratio have already become stable compared with the 4 th and 5 th injection treatments, and the number of dry gas injections corresponding to the optimal gas injection effect is determined to be 4.
The embodiment provides a condensate gas reservoir gas injection parameter optimization method, which determines simulation environment parameters through a constant volume depletion experiment so as to perform simulation on the environment when a condensate gas reservoir blocks an oil-gas seepage channel; the method comprises the steps of performing dry gas injection treatment on a simulation environment obtained by simulation for multiple times, performing composition analysis on condensate oil samples and mixed gas in the simulation environment, recording the oil-gas state of the simulation environment before and after each injection treatment, and constructing the corresponding relation between the injection treatment times and the oil-gas state to determine the corresponding relation between the injection treatment times and the gas injection effect, thereby determining the optimal dry gas injection times of the actual condensate gas reservoir environment, achieving the optimal gas injection times under the condensate gas reservoir simulation environment, avoiding the problems of complex operation process and inaccurate parameters of gas injection times determined according to actual operation experience, and improving the dredging efficiency of an oil-gas seepage channel.
Corresponding to the gas injection parameter optimization method of the condensate gas reservoir in the foregoing embodiment, fig. 3 is a schematic structural diagram of a gas injection parameter optimization apparatus of a condensate gas reservoir provided in an embodiment of the present disclosure, and as shown in fig. 3, the gas injection parameter optimization apparatus of the condensate gas reservoir of the present embodiment includes: an acquisition device 31, a PVT analyzer 32, an injection device 33, an analysis device 34, and a calculation device 35;
the collecting device 31 is used for collecting a separator degassed oil sample and a well casing gas sample in a condensate gas reservoir environment to prepare a condensate oil sample.
In this embodiment, the collecting device 31 is a professional device capable of collecting an oil sample and a gas sample from the condensate gas reservoir environment, such as a sampling bottle, and the collected oil sample and gas sample are used to configure the condensate oil sample to construct the condensate gas reservoir simulation environment.
The PVT analyzer 32 is configured to perform simulation on the condensate gas reservoir environment based on the condensate oil sample.
In this embodiment, a condensate gas reservoir environment is simulated in a PVT cylinder of the PVT analyzer 32, the PVT cylinder simulates an oil-gas channel, a condensate oil sample prepared by the collection device 31 is processed, for example, the condensate oil sample is processed through a constant volume failure experiment, the processed condensate oil sample is input into the PVT cylinder to simulate the condensate gas reservoir, and finally, a condensate gas reservoir simulation environment is constructed.
The injection device 33 is configured to perform multiple dry gas injection processes on a simulation environment obtained by simulation.
In this embodiment, the injection device 33 is a device capable of injecting dry gas into the PVT analyzer 32, such as an injection pump, and the injection device 33 performs a plurality of times of dry gas injection processes into a simulation environment to observe the state of the condensate sample before and after the injection of the dry gas.
The analysis device 34 is used for analyzing the components of the condensate oil sample and the mixed gas in the simulation environment for adjusting the ambient pressure.
In the present embodiment, the analysis device 34 is a device capable of analyzing the components of the condensate and the mixed gas, such as a separator, a gas meter, and a gas chromatograph, and the analysis device 34 analyzes the components of the condensate and the mixed gas after each gas injection to determine the effect of each gas injection.
The computing device 35 is configured to record the oil-gas state of the simulation environment before and after each injection processing, and construct a correspondence between the number of injection processing times and the oil-gas state; and determining the dry gas injection times of the condensate gas reservoir environment according to the corresponding relation.
In this embodiment, the computing device 35 is a device with storage and calculation functions, such as a computer, a server, and the like, the computing device 35 records the oil-gas state of the simulation environment before and after each injection process, and constructs a corresponding relationship between the number of injection processes and the oil-gas state, and the determined corresponding relationship is used to determine the relationship between the gas injection effect and the gas injection number, so as to determine the optimal gas injection number.
Optionally, the PVT analyzer 32 is specifically configured to perform a constant volume depletion experiment on a condensate oil sample based on an oil and gas reservoir fluid physical property analysis method to obtain a simulation environment parameter; and constructing a simulation environment of the condensate gas reservoir according to the simulation environment parameters.
Optionally, the injection device 33 is specifically configured to inject dry gas into the simulation environment until the volume of the condensate sample in the simulation environment reaches a preset volume range; and when the condensate oil sample in the simulation environment is fully mixed with the injected dry gas, adjusting the environmental pressure of the current simulation environment.
Optionally, the analysis device 34 is specifically configured to perform component analysis on the condensate sample and the mixed gas in the simulation environment with the environmental pressure adjusted, so as to obtain the saturation of the condensate sample and the oil content and the gas content of the mixed gas.
Optionally, the computing device 35 is specifically configured to obtain a condensate state in the condensate gas reservoir environment; wherein the condensate condition comprises condensate saturation and condensate volume; and determining the optimal dry gas injection times from the corresponding relation according to the condensate oil state so as to perform dry gas injection treatment on the condensate gas reservoir environment.
Specifically, firstly, the collecting device 31 collects a separator degassed oil sample and a well casing gas sample in a condensate gas reservoir environment, prepares a condensate oil sample, processes the condensate oil sample by using the PVT analyzer 32 to perform a constant volume failure experiment to obtain simulation environment parameters (maximum condensate saturation, condensate volume and environment pressure), cleans the PVT analyzer 32, inputs the condensate oil sample with the maximum condensate saturation into the PVT analyzer 32, adjusts the pressure in the PVT analyzer 32 to the environment pressure to construct a condensate gas reservoir simulation environment, then the injecting device 33 injects dry gas into the simulation environment until the volume of the condensate oil sample in the simulation environment reaches a preset volume range, adjusts the environment pressure of the current simulation environment when the condensate oil sample in the simulation environment and the injected dry gas are fully mixed, the analysis device 34 performs component analysis on the condensate sample and the mixed gas in the simulation environment with the environment pressure adjusted, so as to obtain the saturation of the condensate sample and the oil content and the gas content of the mixed gas, finally, the calculation device 35 records the oil-gas state of the simulation environment before and after each injection treatment (the volume of the condensate sample before and after the environment pressure is adjusted, the saturation of the condensate sample, and the oil content and the gas content of the mixed gas), constructs the corresponding relationship between the injection treatment times and the oil-gas state, and after the corresponding relationship is constructed, the calculation device 35 determines the optimal dry gas injection times from the corresponding relationship according to the condensate state in the condensate reservoir environment, so as to perform the dry gas injection treatment on the condensate reservoir environment.
The embodiment of the disclosure provides a condensate gas reservoir gas injection parameter optimization device, which is characterized in that a collection device collects a separator degassed oil sample and a well casing gas sample under a condensate gas reservoir environment to prepare a condensate oil sample; performing simulation on the condensate gas reservoir environment by a PVT analyzer based on the condensate oil sample; the gas injection processing equipment performs multiple times of dry gas injection processing on a simulation environment obtained by simulation; the computing equipment records the oil-gas state of the simulation environment before and after each injection treatment, and establishes the corresponding relation between the injection treatment times and the oil-gas state; and determining the dry gas injection times of the condensate gas reservoir environment according to the corresponding relation. The condensate gas reservoir gas injection parameter optimization device that this embodiment provided, can carry out analog simulation to the condensate gas reservoir environment of reality, with the similarity of guaranteeing simulation environment and actual environment, make the data that the gas injection was handled and is obtained more accurate, and obtain the oil gas state through carrying out many times dry gas injection processing to simulation environment, establish the corresponding relation between number of times that the injection was handled and the oil gas state, and then confirm the optimal gas injection number of times according to the corresponding relation, the problem that the operation process that has solved and has confirmed the gas injection parameter according to actual work experience is complicated and the parameter is inaccurate, the efficiency and the rate of accuracy of obtaining of the optimal gas injection number of times have been improved, the mediation effect of oil gas seepage flow passageway has been improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A condensate gas reservoir gas injection parameter optimization method is characterized by comprising the following steps:
collecting a separator degassed oil sample and a well casing gas sample in a condensate gas reservoir environment to prepare a condensate oil sample;
performing analog simulation on the condensate gas reservoir environment based on the condensate oil sample, and performing multiple times of dry gas injection treatment on a simulation environment obtained by analog simulation;
recording the oil-gas state of the simulation environment before and after each injection treatment, and constructing a corresponding relation between the injection treatment times and the oil-gas state;
and determining the dry gas injection times of the condensate gas reservoir environment according to the corresponding relation.
2. The method of claim 1, wherein the simulating the condensate gas reservoir environment based on the condensate oil sample comprises:
performing a constant volume failure experiment on a condensate oil sample based on an oil-gas reservoir fluid physical property analysis method to obtain a simulation environment parameter;
and constructing a simulation environment of the condensate gas reservoir according to the simulation environment parameters.
3. The method of claim 2, wherein the simulated environmental parameters include maximum condensate saturation, condensate volume, and ambient pressure.
4. The method according to claim 1, wherein any one of a plurality of dry gas injection processes is performed for a simulation environment obtained by simulation, the injection process including:
injecting dry gas into the simulation environment until the volume of the condensate oil sample in the simulation environment is within a preset volume range;
when the condensate oil sample in the simulation environment is fully mixed with the injected dry gas, adjusting the environmental pressure of the current simulation environment;
and analyzing the components of the condensate oil sample and the mixed gas in the simulation environment with the environment pressure adjusted to obtain the saturation of the condensate oil sample and the oil content and the gas content of the mixed gas.
5. The method of claim 1, wherein the hydrocarbon state comprises a volume of the condensate sample, a saturation of the condensate sample, and an oil content and a gas content of the gas mixture before and after the conditioning of the ambient pressure.
6. The method of claim 1, wherein said determining a number of dry gas injections into the condensate gas reservoir environment based on the correspondence comprises:
acquiring a condensate oil state in the condensate gas reservoir environment; wherein the condensate condition includes condensate saturation and condensate volume;
and determining the optimal dry gas injection times from the corresponding relation according to the condensate oil state, so as to perform dry gas injection treatment on the condensate gas reservoir environment.
7. The condensate gas reservoir gas injection parameter optimizing device is characterized by comprising the following components: the device comprises acquisition equipment, a PVT analyzer, injection equipment, analysis equipment and computing equipment;
the collecting device is used for collecting a separator degassed oil sample and a well casing gas sample in a condensate gas reservoir environment to prepare a condensate oil sample;
the PVT analyzer is used for performing simulation on the condensate gas reservoir environment based on the condensate oil sample;
the injection equipment is used for performing multiple times of dry gas injection treatment on a simulation environment obtained by simulation;
the analysis equipment is used for analyzing the components of the condensate oil sample and the mixed gas in the simulation environment with the environment pressure adjusted;
the computing equipment is used for recording the oil-gas state of the simulation environment before and after each injection treatment, and establishing the corresponding relation between the injection treatment times and the oil-gas state; and determining the dry gas injection times of the condensate gas reservoir environment according to the corresponding relation.
8. The device according to claim 7, wherein the PVT analyzer is specifically used for performing a constant volume depletion experiment on a condensate sample based on a hydrocarbon reservoir fluid physical property analysis method to obtain a simulation environmental parameter; and constructing a simulation environment of the condensate gas reservoir according to the simulation environment parameters.
9. The apparatus according to claim 7, wherein the injection device is configured to inject dry gas into the simulated environment until the volume of the condensate sample in the simulated environment reaches a predetermined volume range; and when the condensate oil sample in the simulation environment is fully mixed with the injected dry gas, adjusting the environmental pressure of the current simulation environment.
10. The apparatus according to claim 7, wherein the computing device is specifically configured to obtain a condensate condition in the condensate reservoir environment; wherein the condensate condition comprises condensate saturation and condensate volume; and determining the optimal dry gas injection times from the corresponding relation according to the condensate oil state so as to perform dry gas injection treatment on the condensate gas reservoir environment.
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