CN111894537A - Method and device for exploiting oil field in high water cut period - Google Patents

Method and device for exploiting oil field in high water cut period Download PDF

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CN111894537A
CN111894537A CN201910370752.XA CN201910370752A CN111894537A CN 111894537 A CN111894537 A CN 111894537A CN 201910370752 A CN201910370752 A CN 201910370752A CN 111894537 A CN111894537 A CN 111894537A
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oil
oil field
target
data
layer
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CN111894537B (en
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杨阳
张文旗
王俊文
阎逸群
张原�
吕洲
张萌
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Petrochina Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/20Displacing by water
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B25/00Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/08Obtaining fluid samples or testing fluids, in boreholes or wells
    • E21B49/087Well testing, e.g. testing for reservoir productivity or formation parameters
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A10/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
    • Y02A10/40Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping

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  • Engineering & Computer Science (AREA)
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  • Environmental & Geological Engineering (AREA)
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Abstract

The application provides an oilfield high water cut period exploitation method and device, wherein the method comprises the following steps: the method comprises the steps of obtaining production data of a target oil field, wherein the target oil field is an oil field with the water content exceeding a preset water content threshold value, and a plurality of oil layers exist in the target oil field; determining an oil-water interface of each oil layer in the target oil field according to the production data; substituting the oil-water interface of each oil layer into a pre-constructed geological model of the target oil field to obtain oil-water distribution data of each oil layer in the target oil field; and exploiting the target oil field according to the oil-water distribution data of each oil layer. According to the oil field exploitation method and the oil field exploitation device, the production data of the oil field are obtained, the oil-water distribution data of each oil layer in the oil field are obtained, the oil field is exploited according to the oil-water distribution data of each oil layer, the exploitation cost of the oil field is reduced, and the economic benefit of oil field exploitation is improved.

Description

Method and device for exploiting oil field in high water cut period
Technical Field
The application relates to the technical field of oil and gas development, in particular to a method and a device for exploiting an oil field in a high water cut period.
Background
Oilfield flooding development is an economic and effective development mode with simple operation process, so that the oilfield flooding development is widely adopted by the oilfield. Along with the development of the oil field, the water content continuously rises, and when the water content of the oil field is more than 60%, a high water content period is started. Although many fields are in high water cut periods, the potential of the remaining oil layer is still large, and the remaining oil layer can still be exploited through water drive.
However, in the prior art, the distribution simulation of the residual oil layer in the high water cut period is limited to numerical simulation and physical simulation, and production data is not involved, so that the accuracy of the simulation result is not high, and further, the economic benefit of oil field exploitation in the high water cut period is low due to the adoption of a new exploitation technology.
In view of the above technical problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the application provides a method and a device for exploiting an oil field in a high water cut period, and aims to solve the technical problems that the distribution simulation precision of an oil layer is not high in the prior art, so that the exploitation cost of the oil field is high, and the exploitation economic benefit is low.
In one aspect, a method for exploiting an oil field in a high water cut period is provided, and comprises the following steps:
the method comprises the steps of obtaining production data of a target oil field, wherein the target oil field is an oil field with the water content exceeding a preset water content threshold value, and a plurality of oil layers exist in the target oil field;
determining an oil-water interface of each oil layer in the target oil field according to the production data;
substituting the oil-water interface of each oil layer into a pre-constructed geological model of the target oil field to obtain oil-water distribution data of each oil layer in the target oil field;
and exploiting the target oil field according to the oil-water distribution data of each oil layer.
In one embodiment, the exploiting the target oil field according to the oil-water distribution data of each oil layer comprises:
acquiring water injection effect data, perforation data and profile data of the target oil field;
determining communication data of oil layers in the target oil field, whether an unexploited oil production layer exists or not and the exploitation degree of the exploited oil production layer according to the water injection effect data, the perforation data and the profile data of the target oil field;
and mining the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the mining degree of a mined oil layer.
In one embodiment, the geological model of the target field is constructed as follows, including:
acquiring observation data and coring data of the target oil field;
determining a dephasing characteristic of the target field from the observation data and the coring data;
obtaining a core sample of the target oil field;
determining the reservoir characteristics of the target oil field according to the core sample;
and constructing a geological model of the target oil field according to the sedimentary facies characteristics and the oil reservoir characteristics of the target oil field.
In one embodiment, the exploiting the target oil field according to the oil-water distribution data of each oil layer, the connection data of each oil layer, the existence of an unexplored oil production layer and the exploitation degree of an exploited oil production layer comprises:
determining the exploitation scheme of the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the exploitation degree of an exploited oil production layer;
determining the yield of the mining scheme of the target oil field within a preset year;
and under the condition that the yield rate of the mining scheme of the target oil field in a preset year is larger than a preset yield threshold value, mining the target oil field according to the mining scheme of the target oil field.
In one embodiment, after determining the rate of return for the preset year of the production plan of the target oil field, the method further comprises:
under the condition that the yield rate of the mining scheme of the target oil field in the preset year is determined to be less than or equal to the preset yield threshold, the following steps are repeatedly executed until the yield rate of the mining scheme of the target oil field in the preset year is greater than the preset yield threshold: and adjusting the exploitation scheme of the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the exploitation degree of the exploited oil production layer.
In another aspect, an oilfield high water cut stage production device is provided, comprising:
the system comprises an acquisition unit, a storage unit and a control unit, wherein the acquisition unit is used for acquiring production data of a target oil field, the target oil field is an oil field with the water content exceeding a preset water content threshold value, and a plurality of oil layers exist in the target oil field;
the determining unit is used for determining the oil-water interface of each oil layer in the target oil field according to the production data;
the substitution unit is used for substituting the oil-water interface of each oil layer into a pre-constructed geological model of the target oil field to obtain oil-water distribution data of each oil layer in the target oil field;
and the mining unit is used for mining the target oil field according to the oil-water distribution data of each oil layer.
In one embodiment, the mining unit comprises:
the first acquisition module is used for acquiring water injection effect data, perforation data and profile data of the target oil field;
the first determination module is used for determining the communication data of each oil layer in the target oil field, whether an unexploited oil production layer exists or not and the exploitation degree of the exploited oil production layer according to the water injection effect data, the perforation data and the profile data of the target oil field;
and the mining module is used for mining the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil layer exists or not and the mining degree of the exploited oil layer.
In one embodiment, the substituting unit includes:
the second acquisition module is used for acquiring observation data and coring data of the target oil field;
a second determination module for determining sedimentary facies characteristics of the target oilfield based on the observation data and the coring data;
the third obtaining module is used for obtaining a rock core sample of the target oil field;
the third determining module is used for determining the reservoir characteristics of the target oil field according to the core sample;
and the construction module is used for constructing a geological model of the target oil field according to the sedimentary facies characteristics and the oil reservoir characteristics of the target oil field.
In one embodiment, the mining module comprises:
the first determining submodule is used for determining the exploitation scheme of the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the exploitation degree of the exploited oil production layer;
the second determining submodule is used for determining the yield of the mining scheme of the target oil field within a preset year;
and the mining submodule is used for mining the target oil field according to the mining scheme of the target oil field under the condition that the yield rate of the mining scheme of the target oil field in a preset age is determined to be greater than a preset yield threshold value.
In one embodiment, the second determining sub-module is further configured to:
under the condition that the yield rate of the mining scheme of the target oil field in the preset year is determined to be less than or equal to the preset yield threshold, the following steps are repeatedly executed until the yield rate of the mining scheme of the target oil field in the preset year is greater than the preset yield threshold: and adjusting the exploitation scheme of the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the exploitation degree of the exploited oil production layer.
In yet another aspect, an electronic device is provided, comprising a display screen, a processor, and a memory storing processor-executable instructions, the instructions when executed by the processor implementing the steps of the method of:
the method comprises the steps of obtaining production data of a target oil field, wherein the target oil field is an oil field with the water content exceeding a preset water content threshold value, and a plurality of oil layers exist in the target oil field;
determining an oil-water interface of each oil layer in the target oil field according to the production data;
substituting the oil-water interface of each oil layer into a pre-constructed geological model of the target oil field to obtain oil-water distribution data of each oil layer in the target oil field;
and exploiting the target oil field according to the oil-water distribution data of each oil layer.
In yet another aspect, a computer-readable storage medium is provided having computer instructions stored thereon which, when executed, implement the steps of the method of:
the method comprises the steps of obtaining production data of a target oil field, wherein the target oil field is an oil field with the water content exceeding a preset water content threshold value, and a plurality of oil layers exist in the target oil field;
determining an oil-water interface of each oil layer in the target oil field according to the production data;
substituting the oil-water interface of each oil layer into a pre-constructed geological model of the target oil field to obtain oil-water distribution data of each oil layer in the target oil field;
and exploiting the target oil field according to the oil-water distribution data of each oil layer.
According to the oil field production data acquisition method and device, the production data of the oil field is acquired, the oil-water distribution data of each oil layer in the oil field is obtained in combination with the pre-constructed geological model, the oil field is exploited according to the oil-water distribution data of each oil layer, the problem that the oil field exploitation cost is high due to the fact that simulation of the oil-water distribution data of each oil layer in the oil field is not accurate enough is solved, the exploitation cost of the oil field is reduced, and the technical effect of improving the economic benefit of oil field exploitation is achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this application, and are not intended to limit the application. In the drawings:
FIG. 1 is a schematic flow diagram of a method for producing an oil field in a high water cut phase in an embodiment of the present application;
FIG. 2 is a distribution diagram of the oil zones (oil groups and small layers) of an oil field in an embodiment of the present application;
FIG. 3 is a schematic illustration of the oil-water interface of oil zones in an oil field according to an embodiment of the present disclosure;
FIG. 4 is a thickness distribution diagram of each oil layer in a southern white alkali beach fracture oil field in an example of the present application;
FIG. 5 is a diagram of a dynamic analysis of a certain injection and production well group of an oil field in an embodiment of the present application;
fig. 6 is a schematic structural diagram of an oilfield high water cut stage production device in an embodiment of the application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present application are provided to explain the present application and not to limit the present application.
In the process of oil field exploitation, oil field flooding is an economic and effective exploitation mode, but with continuous exploitation of many old oil fields, the water content of the old oil fields is larger and larger, and under the condition that the water content reaches 60%, the old oil fields enter a high water-content period. However, in the prior art, after the oil field is in a high water cut period, the exploitation potential of the residual oil layer in the oil field is often underestimated, the analysis of the residual oil layer in the oil field in the high water cut period is lacked, only static numerical simulation and physical simulation are considered in establishing the distribution simulation of the residual oil layer, and no production data reflecting the dynamic state of the oil field is involved, so that the precision of the simulation result is poor, and on the basis of the poor simulation result, new technologies such as fracturing and acidizing are adopted to exploit the residual oil layer on a large scale, on one hand, the measures such as fracturing and acidizing only can exploit a small part of the residual oil layer around the oil well, the large-scale exploitation efficiency is not high, improper measures are easy to generate, so that a high-permeability channel is formed, on the other hand, the implementation cost of the new technologies such as fracturing and acidizing is high.
In view of the above problems, the present application provides a method for exploiting an oil field with a high water cut period, which may specifically include the following steps (step S101-step S104), as shown in fig. 1:
step S101, production data of a target oil field is obtained, wherein the target oil field is an oil field with the water content exceeding a preset water content threshold value, and a plurality of oil layers exist in the target oil field.
In order to determine the distribution data of each oil layer in the target oil field, the production data of the target oil field at the initial exploitation stage can be firstly obtained, the target oil field is generally an oil field with a high water cut period and a plurality of oil layers, wherein the oil field with the high water cut period refers to an oil field with a water content exceeding a preset water cut threshold value, and the preset water cut threshold value is generally set to be 60%.
The multiple oil layers in the target oil field can be obtained by finely dividing the target oil field through a sequence stratigraphy theory and combining logging data and core data of the target oil field. The stratigraphic sequence is a subject for studying strata with cause relation in a chronostratigraphic framework with an unconformity or a corresponding unconformity as a boundary, and the oil layer may be an oil layer group (oil group) or a single oil layer (small layer), which is not limited in the present application.
And S102, determining the oil-water interface of each oil layer in the target oil field according to the production data.
After the production data of the target oil field is obtained, the oil-water interface of each oil layer in the target oil field can be determined by combining the logging data of the target oil field. The oil-water interface is a contact surface between the oil layer and the water body formed by the oil layer located at the high part of the oil field and the water body located at the bottom or the edge of the oil field due to the difference adjustment effect of the oil layer and the water body.
And S103, substituting the oil-water interface of each oil layer into a pre-constructed geological model of the target oil field to obtain oil-water distribution data of each oil layer in the target oil field.
The oil-water distribution data reflecting the oil-water distribution condition of each layer in the target oil field can be obtained through simulation by substituting the oil-water interface of each oil layer in the target oil field into the pre-constructed geological model, so as to determine the distribution and the thickness of each oil layer. The geological model is a three-dimensional quantitative random model generated by integrating geological data, logging data, geophysical data and a conceptual model.
Specifically, the geological model of the target oil field may be constructed according to the following steps (step S1-step S5):
and step S1, acquiring the observation data and the coring data of the target oil field.
The observation data of the target oil field can be acquired by a field observation outcrop mode, and the sedimentary facies of the sediments in the target oil field can be analyzed by combining the coring data of the target oil field. Wherein the sedimentary phase is the sum of the environment in which the sediment is produced, the production conditions, and the characteristics thereof.
And step S2, determining sedimentary facies characteristics of the target oil field according to the observation data and the coring data.
And by acquiring the observation data and the coring data, the sedimentary facies characteristics of the target oil field can be analyzed and determined. Where the coring data is data for rock sampling by drilling the formation to understand the geology of the formation, the depofacies characteristics may include, but are not limited to, at least one of: the deposition environment and the source direction, and the analysis process may be manual analysis or analysis by specific simulation software, which is not limited in this application.
And step S3, obtaining a core sample of the target oil field.
In order to quickly and efficiently determine the reservoir characteristics of a target oil field, the reservoir characteristics of the target oil field can be determined by extracting specific data in the coring data as core samples and analyzing the core samples.
And step S4, determining the reservoir characteristics of the target oil field according to the core sample.
After the core sample is obtained, reservoir characteristics of the target oil field may be determined by core observation or laboratory testing, wherein the reservoir characteristics may include, but are not limited to, at least one of: reservoir lithology, pore permeability, oiliness, fluid properties, reservoir sensitivity, and seepage characteristics.
And step S5, constructing a geological model of the target oil field according to the sedimentary facies characteristics and the oil layer characteristics of the target oil field.
And substituting the sedimentary facies characteristics and the oil layer characteristics of the target oil field into simulation software, and simulating and generating a geological model of the target oil field by a technical means of simulation integration. The simulation software may be geological simulation software or seismic exploration virtual simulation software, which is not limited in the present application.
And step S104, mining the target oil field according to the oil-water distribution data of each oil layer.
The oil-water distribution data of each oil layer in the target oil field not only considers the static geological data of the target oil field, but also considers the dynamic production data of the target oil field, and the oil-water distribution condition of the target oil field in actual exploitation can be accurately simulated, so that the exploitation personnel can scientifically and efficiently exploit the target oil field.
Specifically, the step of extracting the target oil field according to the oil-water distribution data of the target oil field may include (step S1-step S3):
and step S1, acquiring water injection effect data, perforation data and profile data of the target oil field.
In the water injection experiment of the target oil field, the water injection effect data of the target oil field can be obtained, the perforation data of the target oil field can be obtained by carrying out perforation treatment on the target oil field, and the profile data of the target oil field can be obtained by carrying out profile test on the oil well of the target oil field. The water injection effect data is data reflecting the oil layer characteristics of the oil field after water injection, and the perforation data is data of the oil field in the perforation construction process.
And step S2, determining the communication data of each oil layer in the target oil field, whether an unexplored oil production layer exists and the exploitation degree of the exploited oil production layer according to the water injection effect data, the perforation data and the profile data of the target oil field.
The dynamic water injection effect data of the target oil field are analyzed to obtain the communication data reflecting the communication condition of each oil layer in the target oil field and whether a water channeling layer exists, the perforation data and the logging data of the target oil field are analyzed to determine whether an unexplored oil layer exists in the target oil field, and the section data of the target oil field is analyzed to determine the exploitation degree of the exploited oil layer in the target oil field.
And step S3, exploiting the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the exploitation degree of the exploited oil production layer.
According to the acquired oil-water distribution data of each oil layer and the communication data of each oil layer, the actual conditions of whether the unexploited oil layer and the exploitation degree of the exploited oil layer exist or not are combined, the exploitation scheme of the target oil field can be comprehensively obtained, and the target oil field is exploited according to the exploitation scheme.
For example, when it is determined that oil-water interfaces in oil-water distribution data of a plurality of oil layers of a target oil field are not the same, it is known that the oil layers are different oil reservoirs, and the oil layers cannot be simultaneously exploited in an exploitation scheme; when the thickness of a certain oil layer in the oil-water distribution data of each oil layer of the target oil field is determined to be too thin and the reserve is determined to be too small, the oil well of the certain oil layer needs to be carefully selected in the mining scheme; when the connectivity of each oil layer of the target oil field is determined to be poor, the oil well pattern needs to be encrypted in the mining scheme; when determining that a water channeling layer exists in a target oil field, the mining scheme needs to block a perforation layer section; when the situation that an unexplored oil layer exists in the target oil field is determined, the unexplored oil layer section needs to be opened or a new oil well net needs to be arranged in the exploitation scheme; when an oil layer with low exploitation degree exists in a target oil field, if the analysis reason is heterogeneity, the exploitation scheme can change the liquid flow direction through oil-water well conversion to reduce the water content so as to improve the exploitation degree, if the arrangement of the oil well net is unreasonable, the exploitation scheme can rearrange the oil well net to perfect the injection-exploitation relation, and if the connectivity of certain single oil layers is poor, the exploitation scheme can be improved through small-scale acidification and fracturing improvement technical means.
Specifically, the process of determining the mining scheme of the target oil field may include the following steps (step S11-step S22):
and step S11, determining the yield of the mining scheme of the target oil field within a preset age.
In order to better determine the economic benefit of the exploitation scheme of the target oil field, an oil field fluid model and a rock physical property model can be established in advance, the established geological model is combined to simulate the actual exploitation process of the target oil field, and after the simulation precision reaches the preset precision, the profitability of the exploitation scheme of the target oil field within the preset year is determined.
And step S22, under the condition that the yield rate of the mining scheme of the target oil field in a preset age is determined to be larger than a preset yield threshold value, mining the target oil field according to the mining scheme of the target oil field.
And after the income condition of the current exploitation scheme of the target oil field within the preset year reaches the expected expectation, the target oil field can be exploited according to the current exploitation scheme. The preset year may be half a year or ten years, and the preset profit threshold may be 10%, which is not limited in the present application.
Specifically, after determining the rate of return within the preset year of the mining scheme of the target oil field, the method may further include: under the condition that the yield rate of the mining scheme of the target oil field in the preset year is determined to be less than or equal to the preset yield threshold, the following steps are repeatedly executed until the yield rate of the mining scheme of the target oil field in the preset year is greater than the preset yield threshold: and adjusting the exploitation scheme of the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the exploitation degree of the exploited oil production layer.
For example, when the recovery rate of the target oil field a in fifteen years of the mining scheme a1 is greater than 12%, the target oil field a is mined according to the mining scheme a1, and when the recovery rate of the target oil field B in fifteen years of the mining scheme B1 is less than 12%, the mining scheme B1 needs to be readjusted according to the oil-water distribution data of each oil layer in the target oil field B until the recovery rate of the target oil field B in fifteen years is greater than 12%.
The above method is described in detail with reference to a specific example of a high water period oil field of Xinjiang as a test area, however, it should be noted that this specific example is only for better illustration of the present application and should not be construed as an undue limitation on the present application.
Taking an oil field with a certain high water cut period in Xinjiang as an example, the process of exploiting the oil field according to an exploitation scheme with high economic benefit can comprise the following steps:
step 1, according to the sequence stratigraphy theory, combining the oil field logging curve and the rock core data to finely divide the oil field into oil layers, comprising the following steps: 3 oil groups (oil layer groups) and 19 small layers (single oil layer), as shown in fig. 2; obtaining observation data through field observation outcrop, analyzing a reservoir deposition environment mainly including a fan delta front edge subphase by combining coring data, wherein the source direction is a northwest direction source; and determining reservoir lithology, pore permeability, oil content, fluid property, reservoir sensitivity, seepage characteristics and the like through core observation and indoor experiments.
And 2, establishing an accurate geological model according to the analysis result of the step 1.
And 3, determining an oil-water interface by combining the production data during initial production of the well and the analysis result of logging data, wherein as shown in FIG. 3, S3-S5 layers are produced in 8251 wells in the initial period, S112-S322 is replenished in 2001, pure oil is produced, S4-S5 is produced in 8252 in the initial period, S112-S322 is replenished in 1999, pure oil is produced, S4-S5 is produced in 8248 in the initial period, S121-S322 is replenished in 2004, high water content is produced in the initial period, S4-S5 is produced in the initial period, S111-S211 is replenished in 2001, high water content is produced in the initial period, and accordingly, the upper oil-water interface is determined to be 1700 m. According to the method, three oil groups are finally found to have three different oil-water interfaces, so that the oil groups are divided into three oil reservoirs from top to bottom, and a layered system is required to be developed.
And 4, analyzing the distribution and thickness of each oil layer in the fracture of the south white alkali beach in the geological model, as shown in figure 4.
Step 5, determining a plurality of main oil layer communication differences among some wells through dynamic analysis of each well group, and further knowing that the main reason is that the injection-production relation is incomplete and a well pattern needs to be encrypted; most wells have water channeling zones S411 causing large amounts of remaining oil in other zones, which need to be plugged as shown in fig. 5; all oil layers of part of well areas are flooded with water, oil-water well conversion is needed, the direction of liquid flow is changed, and a well pattern is adjusted; the upper oil group is not basically exploited, but because the analysis result of the step 4 shows that the upper oil group is thin in thickness and discontinuous in plane distribution, a horizontal well is required for exploitation.
And 6, designing a scheme for water-drive residual oil exploitation according to the analysis result of the step 5, wherein the basic scheme comprises the steps of constructing a high-position limited water injection channeling layer S411, exchanging and converting the flow direction of wells, developing an upper unapplied layer system of a horizontal well, constructing lower oil reservoir well pattern encryption of a low position and an intermediate oil reservoir replacing step.
And 7, establishing an oil reservoir fluid model and a rock physical model by using the analysis result of the step 1, combining a geological model, and carrying out numerical simulation calculation on the scheme of the step 6, wherein the yield within fifteen years is 13.4% and is more than 12% of the expected yield, and then actually exploiting the oil field according to the scheme of the step 6.
Based on the same application concept, the embodiment of the application also provides an oil field high water cut period exploitation device, and the device is described in the following embodiment. Because the principle of solving the problems of the oil field high water cut period exploitation device is similar to that of an oil field high water cut period exploitation method, the implementation of the oil field high water cut period exploitation device can refer to the implementation of the oil field high water cut period exploitation method, and repeated parts are not described again. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated. Fig. 6 is a block diagram of an embodiment of the present disclosure, which shows an apparatus for producing an oil field with a high water cut period, including: the following describes the configuration of the acquisition unit 601, the determination unit 602, the substitution unit 603, and the extraction unit 604.
The acquiring unit 601 is configured to acquire production data of a target oil field, where the target oil field is an oil field with a water content exceeding a preset water content threshold, and multiple oil layers exist in the target oil field;
a determining unit 602, configured to determine an oil-water interface of each oil layer in the target oil field according to the production data;
a substituting unit 603, configured to substitute an oil-water interface of each oil layer into a pre-constructed geological model of the target oil field, so as to obtain oil-water distribution data of each oil layer in the target oil field;
and the mining unit 604 is configured to mine the target oil field according to the oil-water distribution data of each oil layer.
In one embodiment, the production unit 604 may include: the first acquisition module is used for acquiring water injection effect data, perforation data and profile data of the target oil field; the first determination module is used for determining the communication data of each oil layer in the target oil field, whether an unexploited oil production layer exists or not and the exploitation degree of the exploited oil production layer according to the water injection effect data, the perforation data and the profile data of the target oil field; and the mining module is used for mining the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil layer exists or not and the mining degree of the exploited oil layer.
In an embodiment, the substituting unit 603 may include: the second acquisition module is used for acquiring observation data and coring data of the target oil field; a second determination module for determining sedimentary facies characteristics of the target oilfield based on the observation data and the coring data; the third obtaining module is used for obtaining a rock core sample of the target oil field; the third determining module is used for determining the reservoir characteristics of the target oil field according to the core sample; and the construction module is used for constructing a geological model of the target oil field according to the sedimentary facies characteristics and the oil reservoir characteristics of the target oil field.
In one embodiment, the mining module comprises: the first determining submodule is used for determining the exploitation scheme of the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the exploitation degree of the exploited oil production layer; the second determining submodule is used for determining the yield of the mining scheme of the target oil field within a preset year; and the mining submodule is used for mining the target oil field according to the mining scheme of the target oil field under the condition that the yield rate of the mining scheme of the target oil field in a preset age is determined to be greater than a preset yield threshold value.
In an embodiment, the second determining submodule may be further configured to:
under the condition that the yield rate of the mining scheme of the target oil field in the preset year is determined to be less than or equal to the preset yield threshold, the following steps are repeatedly executed until the yield rate of the mining scheme of the target oil field in the preset year is greater than the preset yield threshold: and adjusting the exploitation scheme of the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the exploitation degree of the exploited oil production layer.
According to the oil field production data, the oil-water distribution data of each oil layer in the oil field are acquired, the oil field is exploited according to the oil-water distribution data of each oil layer, the oil-water distribution simulation precision of each oil layer in the oil field is improved, the exploitation cost of the oil field is reduced, and the economic benefit of oil field exploitation is improved.
The embodiment of the application also provides electronic equipment for high water cut period exploitation of the oil field, and the electronic equipment can specifically comprise input equipment, a processor and a memory. The electronic device may be configured to perform the steps of:
step 1, obtaining production data of a target oil field, wherein the target oil field is an oil field with water content exceeding a preset water-containing threshold value, and a plurality of oil layers exist in the target oil field;
step 2, determining an oil-water interface of each oil layer in the target oil field according to the production data;
step 3, substituting the oil-water interface of each oil layer into a pre-constructed geological model of the target oil field to obtain oil-water distribution data of each oil layer in the target oil field;
and 4, mining the target oil field according to the oil-water distribution data of each oil layer.
In this embodiment, the input device may be one of the main apparatuses for information exchange between a user and a computer system. The input device may include a keyboard, a mouse, a camera, a scanner, a light pen, a handwriting input board, a voice input device, etc.; the input device is used to input raw data and a program for processing the data into the computer. The input device can also acquire and receive data transmitted by other modules, units and devices. The processor may be implemented in any suitable way. For example, the processor may take the form of, for example, a microprocessor or processor and a computer-readable medium that stores computer-readable program code (e.g., software or firmware) executable by the (micro) processor, logic gates, switches, an Application Specific Integrated Circuit (ASIC), a programmable logic controller, an embedded microcontroller, and so forth. The memory may in particular be a memory device used in modern information technology for storing information. The memory may include multiple levels, and in a digital system, the memory may be any memory as long as it can store binary data; in an integrated circuit, a circuit without a physical form and with a storage function is also called a memory, such as a RAM, a FIFO and the like; in the system, the storage device in physical form is also called a memory, such as a memory bank, a TF card and the like.
In this embodiment, the functions and effects specifically realized by the electronic device can be explained by comparing with other embodiments, and are not described herein again.
There is also provided in an embodiment of the present application a computer storage medium for high water cut production of an oil field, the computer storage medium storing computer program instructions that, when executed, implement: the method comprises the steps of obtaining production data of a target oil field, wherein the target oil field is an oil field with the water content exceeding a preset water content threshold value, and a plurality of oil layers exist in the target oil field; determining an oil-water interface of each oil layer in the target oil field according to the production data; substituting the oil-water interface of each oil layer into a pre-constructed geological model of the target oil field to obtain oil-water distribution data of each oil layer in the target oil field; and exploiting the target oil field according to the oil-water distribution data of each oil layer.
In the present embodiment, the storage medium includes, but is not limited to, a Random Access Memory (RAM), a Read-Only Memory (ROM), a Cache (Cache), a Hard disk (HDD), or a Memory Card (Memory Card). The memory may be used to store computer program instructions. The network communication unit may be an interface for performing network connection communication, which is set in accordance with a standard prescribed by a communication protocol.
In this embodiment, the functions and effects specifically realized by the program instructions stored in the computer storage medium can be explained by comparing with other embodiments, and are not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the embodiments of the present application described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different from that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, embodiments of the present application are not limited to any specific combination of hardware and software.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the application should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the pending claims along with the full scope of equivalents to which such claims are entitled.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and it will be apparent to those skilled in the art that various modifications and variations can be made in the embodiment of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (12)

1. A method for exploiting an oil field in a high water cut period is characterized by comprising the following steps:
the method comprises the steps of obtaining production data of a target oil field, wherein the target oil field is an oil field with the water content exceeding a preset water content threshold value, and a plurality of oil layers exist in the target oil field;
determining an oil-water interface of each oil layer in the target oil field according to the production data;
substituting the oil-water interface of each oil layer into a pre-constructed geological model of the target oil field to obtain oil-water distribution data of each oil layer in the target oil field;
and exploiting the target oil field according to the oil-water distribution data of each oil layer.
2. The method of claim 1, wherein producing the target field based on the oil and water distribution data for each of the reservoirs comprises:
acquiring water injection effect data, perforation data and profile data of the target oil field;
determining communication data of oil layers in the target oil field, whether an unexploited oil production layer exists or not and the exploitation degree of the exploited oil production layer according to the water injection effect data, the perforation data and the profile data of the target oil field;
and mining the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the mining degree of a mined oil layer.
3. The method of claim 1, wherein constructing the geological model of the target field comprises:
acquiring observation data and coring data of the target oil field;
determining a dephasing characteristic of the target field from the observation data and the coring data;
obtaining a core sample of the target oil field;
determining the reservoir characteristics of the target oil field according to the core sample;
and constructing a geological model of the target oil field according to the sedimentary facies characteristics and the oil reservoir characteristics of the target oil field.
4. The method of claim 2, wherein producing the target field based on the oil and water distribution data for the reservoirs, the connectivity data for the reservoirs, the presence of unexplored zones, and the extent of production from the produced reservoirs comprises:
determining the exploitation scheme of the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the exploitation degree of an exploited oil production layer;
determining the yield of the mining scheme of the target oil field within a preset year;
and under the condition that the yield rate of the mining scheme of the target oil field in a preset year is larger than a preset yield threshold value, mining the target oil field according to the mining scheme of the target oil field.
5. The method of claim 4, further comprising, after determining a rate of return for a preset age of a production scenario for the target field:
under the condition that the yield rate of the mining scheme of the target oil field in the preset year is determined to be less than or equal to the preset yield threshold, the following steps are repeatedly executed until the yield rate of the mining scheme of the target oil field in the preset year is greater than the preset yield threshold: and adjusting the exploitation scheme of the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the exploitation degree of the exploited oil production layer.
6. An oil field high water cut stage exploitation device, comprising:
the system comprises an acquisition unit, a storage unit and a control unit, wherein the acquisition unit is used for acquiring production data of a target oil field, the target oil field is an oil field with the water content exceeding a preset water content threshold value, and a plurality of oil layers exist in the target oil field;
the determining unit is used for determining the oil-water interface of each oil layer in the target oil field according to the production data;
the substitution unit is used for substituting the oil-water interface of each oil layer into a pre-constructed geological model of the target oil field to obtain oil-water distribution data of each oil layer in the target oil field;
and the mining unit is used for mining the target oil field according to the oil-water distribution data of each oil layer.
7. The apparatus of claim 6, wherein the production unit comprises:
the first acquisition module is used for acquiring water injection effect data, perforation data and profile data of the target oil field;
the first determination module is used for determining the communication data of each oil layer in the target oil field, whether an unexploited oil production layer exists or not and the exploitation degree of the exploited oil production layer according to the water injection effect data, the perforation data and the profile data of the target oil field;
and the mining module is used for mining the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil layer exists or not and the mining degree of the exploited oil layer.
8. The apparatus of claim 6, wherein the substituting unit comprises:
the second acquisition module is used for acquiring observation data and coring data of the target oil field;
a second determination module for determining sedimentary facies characteristics of the target oilfield based on the observation data and the coring data;
the third obtaining module is used for obtaining a rock core sample of the target oil field;
the third determining module is used for determining the reservoir characteristics of the target oil field according to the core sample;
and the construction module is used for constructing a geological model of the target oil field according to the sedimentary facies characteristics and the oil reservoir characteristics of the target oil field.
9. The apparatus of claim 7, wherein the production module comprises:
the first determining submodule is used for determining the exploitation scheme of the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the exploitation degree of the exploited oil production layer;
the second determining submodule is used for determining the yield of the mining scheme of the target oil field within a preset year;
and the mining submodule is used for mining the target oil field according to the mining scheme of the target oil field under the condition that the yield rate of the mining scheme of the target oil field in a preset age is determined to be greater than a preset yield threshold value.
10. The apparatus of claim 9, wherein the second determination submodule is further configured to:
under the condition that the yield rate of the mining scheme of the target oil field in the preset year is determined to be less than or equal to the preset yield threshold, the following steps are repeatedly executed until the yield rate of the mining scheme of the target oil field in the preset year is greater than the preset yield threshold: and adjusting the exploitation scheme of the target oil field according to the oil-water distribution data of each oil layer, the communication data of each oil layer, whether an unexplored oil production layer exists or not and the exploitation degree of the exploited oil production layer.
11. An electronic device comprising a display screen, a processor and a memory storing processor-executable instructions that when executed by the processor implement the steps of the method of any of claims 1 to 5.
12. A computer readable storage medium having stored thereon computer instructions which, when executed, implement the steps of the method of any one of claims 1 to 5.
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