CN114718531A - Perforation optimization method and device for improving accumulation-surface combination flooding effect of thick-layer sandstone reservoir - Google Patents
Perforation optimization method and device for improving accumulation-surface combination flooding effect of thick-layer sandstone reservoir Download PDFInfo
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Abstract
The invention provides a perforation optimization method and a perforation optimization device for improving a polymer flooding composite effect of a thick-layer sandstone reservoir, wherein the method comprises the following steps: step 1: identifying a distribution rule of residual oil in the thick-layer sandstone oil reservoir; step 2: identifying the distribution characteristics of an internal interlayer and a low physical property section of the thick-layer sandstone reservoir; and step 3: identifying low-efficiency and invalid water circulation, and determining the position of a water flow advantage channel inside the thick-layer sandstone reservoir; and 4, step 4: and (4) optimizing the perforation scheme of the polymer-surfactant combination flooding of the thick-layer sandstone oil reservoir by combining the analysis results in the steps 1-3. The method provided by the invention combines the distribution mode of the residual oil, the distribution characteristics of the interlayer and the low-physical-property section in the thick layer and the identification of the water flow dominant channel, optimizes the perforation, ensures the effect of each well, realizes the effective utilization of the residual oil and further improves the yield of a single well. The method is simple and easy to implement, the effect of polymer flooding can be improved, the cost of the agent is effectively reduced, and the benefit maximization is realized.
Description
Technical Field
The invention relates to a perforation optimization method and a perforation optimization device for improving a polymer flooding effect of a thick-layer sandstone reservoir, and belongs to the technical field of reservoir development.
Background
Most of dilute oil high-permeability sandstone reservoirs in China are developed by water injection, the development stage of dual-purpose high-stage development with high water content, ultrahigh water content and high extraction degree is entered at present, the potential of continuous water flooding is very limited, and a conversion mode is urgently needed to greatly improve the recovery efficiency. Chemical flooding is an important supporting technology for greatly improving the recovery ratio of water-flooding oil reservoirs, and undergoes the development process of polymer flooding, surfactant flooding, alkali flooding, ternary combination flooding and polymer flooding.
In recent years, polymer surface composite flooding pilot test projects are developed in a plurality of oil fields of Daqing, Shengli, Liaohe, Xinjiang and the like, the types of oil reservoirs selected by the test projects belong to thin-layer or medium-thick-layer sandstone oil reservoirs, and the thickness of the oil reservoir is 5-10 m. As is known, the rational perforation method is a prerequisite for ensuring the chemical flooding effect, and the perforation methods adopted by the test blocks are basically the same, namely: under the condition that the upper and lower interlayers of the injection and production wells are well developed, the target layer of the production well is completely ejected, and the injection well only ejects the corresponding communicating layer for injection and production; by applying the perforation mode, a better poly-surface composite flooding effect is obtained, for example, by 7 months in 2020, the stage production degree is 70.4 percent and the water flooding recovery rate is improved by 19.4 percent in J16 Xinglong platform oil layer poly-surface composite flooding industrial test of Liaohe oil field.
The gathering-surface combined flooding test of the thick-layer sandstone reservoir is developed on the basis of the success of the J16 Xinglong platform oil layer gathering-surface combined flooding industrial test in the Liaohe oil field, and belongs to the first case in China. Thick-layer reservoirs have several characteristics: the single-layer thickness is 15-20 m; the intrastratal heterogeneity is strong; in the long-term water injection development process, a water flow dominant channel is formed in the thick layer; in addition, the type of the residual oil is different from that of a thin-layer or medium-thick-layer oil reservoir, two modes of top gravity oil control and interlayer oil control are mainly adopted, no matter the heavy-layer oil reservoir is reverse rhythm, positive rhythm or composite rhythm, after long-term water drive, because the vertical permeability is greater than the horizontal permeability, under the influence of the density difference of oil and water, the strong flooding proportion of the bottom of the oil layer is higher than that of the top of the oil layer, the residual oil at the top is relatively enriched, and meanwhile, a coring well and a logging well also prove that the interlayer and the low physical property section in the heavy layer have a control effect on the residual oil. Compared with a thin-layer or medium-thick-layer oil reservoir, the development difficulty of the thick-layer sandstone oil reservoir at the polymer surface combined flooding is higher, no experience can be followed, and the thick-layer sandstone oil reservoir is in the stage of exploring a reasonable development mode at present.
The practice shows that if the oil reservoir is developed according to a perforation mode of a thin-layer or medium-thick-layer oil reservoir, namely, all target layers of a production well are shot, an injection well is perforated correspondingly, the polymer flooding effect is poor, because the injected medicament can generate a bottom sinking phenomenon in an interlayer and thick layer which is not developed in a low-physical property section and is extracted from the middle lower part of the production well, or the injected medicament can perform low-efficiency and ineffective circulation through a water flow dominant channel, the production well shows that the effect is not obvious or the polymer flooding effect is not effective for a long time, the injection well shows that the apparent resistance coefficient is low, the enlarged wave and volume effect of the medicament is poor, the residual oil is difficult to be effectively displaced, and the perforation mode not only wastes chemical medicaments, but also influences the polymer flooding effect.
Therefore, the novel perforation optimization method and device capable of improving the polymer flooding effect of the thick-layer sandstone reservoir are provided, and dynamic optimization adjustment of the perforation scheme in the early polymer flooding stage and the displacement process can be effectively guided, so that the polymer flooding effect of the thick-layer sandstone reservoir is improved.
Disclosure of Invention
In order to solve the defects and shortcomings, the invention aims to provide a perforation optimization method for improving the poly-surface composite flooding effect of a thick-layer sandstone reservoir.
The invention also aims to provide a perforation optimization device for improving the poly-surface composite flooding effect of the thick-layer sandstone reservoir.
It is also an object of the invention to provide a computer apparatus.
It is still another object of the present invention to provide a computer-readable storage medium.
In order to achieve the above object, the present invention provides a perforation optimization method for improving the poly-surface combination flooding effect of a thick-layer sandstone reservoir, wherein the method comprises:
step 1: identifying a distribution rule of residual oil in the thick-layer sandstone oil reservoir;
step 2: identifying the distribution characteristics of an internal interlayer and a low physical property section of the thick-layer sandstone reservoir;
and step 3: identifying inefficient and ineffective water circulation, and determining the position of a water flow dominant channel inside the thick-layer sandstone reservoir;
and 4, step 4: and (4) optimizing the perforation scheme of the polymer-surfactant combination flooding of the thick-layer sandstone oil reservoir by combining the analysis results in the steps 1-3.
As a specific embodiment of the above method of the present invention, in step 1, the position of the remaining oil inside the thick sandstone reservoir is determined by using logging or core data, so as to preliminarily screen the perforation interval.
In an embodiment of the method of the present invention, the location of the remaining oil inside the thick-layer sandstone reservoir includes a top of an oil layer of the thick-layer sandstone reservoir, an internal interlayer of the thick-layer sandstone reservoir, and/or a low physical property section.
According to the digital model research, the actual production condition of a mine field and core analysis data of a core well, thick-layer sandstone oil is hidden after long-term water drive, the residual oil distribution mode mainly comprises two modes of top gravity oil control and interlayer oil control, the thick-layer sandstone oil reservoir is not only reverse rhythm, positive rhythm or composite rhythm, after long-term water drive, because the vertical permeability is greater than the horizontal permeability, the strong water flooding proportion at the bottom of an oil layer is higher than that at the top of the oil layer due to the influence of the density difference of oil and water, the residual oil at the top is relatively enriched, meanwhile, an interlayer and a low-physical-property section inside the thick-layer sandstone oil reservoir also play a control role in the residual oil, and the residual oil parts are main displacement intervals for polymer surface composite drive.
In a specific embodiment of the above method of the present invention, in step 2, the logging data and the indoor test data and/or dynamic data are used to identify the internal interlayer and the low physical property section of the thick-layer sandstone reservoir.
In an embodiment of the method of the present invention, the dynamic data includes a water absorption profile.
The internal interlayer and the low-physical-property section of the thick-layer sandstone oil reservoir have a packing effect on chemical agents, and are favorable geological conditions for developing polymer flooding. Mine field practices show that when an interlayer and a low-physical-property section in a thick-layer sandstone oil reservoir do not develop, a bottom sinking phenomenon can occur when a medicament is injected in the displacement direction of the production well, and the medicament is produced from the bottom of the production well, so that residual oil on the top is difficult to be effectively displaced. Therefore, the lower limit of the accessible physical property of the chemical agent is determined through indoor test data or production dynamic data, and the interlayer and the low physical property section which have the sealing effect on the chemical agent in the single well are identified by matching with logging data, so that perforation design is carried out on the basis.
As a specific embodiment of the method of the present invention, in step 3, the dynamic monitoring data is used to identify inefficient and ineffective water circulation, and the position of the water flow dominant channel inside the thick-layer sandstone reservoir is determined.
As a specific implementation manner of the method described above, in step 3, if dynamic monitoring data is lacked in the early stage to identify inefficient and ineffective water circulation, data logging is enhanced in the stage of polymer flooding, a water flow dominant channel is found out, perforation is optimized and adjusted in time, and the water flow dominant channel is plugged in time to ensure the polymer flooding effect.
Therefore, the perforation optimization method provided by the invention is not only suitable for making an early perforation scheme of a polymer-surface combination flooding scheme, but also suitable for optimizing and adjusting in the polymer-surface combination flooding process, and provides the direction of perforation optimization and adjustment when the polymer-surface combination flooding has no effect.
Mine practice verifies that the inefficient and ineffective water circulation can be judged on dynamic data, for example, the breakthrough speed of the tracer along a certain direction is obviously higher than that of other directions; the water absorption section and the liquid production section show that the water absorption and liquid production ratio of a certain layer is obviously higher than that of other layers; the content of chloride ions in the produced liquid is basically not changed greatly compared with the water flooding stage; the apparent resistance coefficient of the polymer flooding stage is not obviously changed or even lower than that of the water flooding stage; the production concentration of the production well is high, but the effect of precipitation and oil increase is not seen. These above phenomena combine to determine inefficient, ineffective water circulation.
As a specific embodiment of the above method of the present invention, wherein, for a production well, step 4: and (3) optimizing a perforation scheme of the polymer flooding composite flooding of the thick-layer sandstone reservoir by combining the analysis results in the steps 1-3, wherein the perforation scheme comprises the following steps:
and if an interlayer and/or a low-physical-property section exist in the thick-layer sandstone oil reservoir, jetting a well section with relatively enriched residual oil, but avoiding the interlayer or the low-physical-property section and avoiding a water flow dominant channel, and if no interlayer and low-physical-property section exist in the thick-layer sandstone oil reservoir, jetting the residual oil enriched well section at the top of the thick-layer sandstone oil reservoir.
In the method of the invention, for a production well, if an interlayer and/or a low physical property section exist in a thick-layer sandstone reservoir, residual oil can be enriched in the vicinity of the interlayer and/or the low physical property section, so that a well section with relatively enriched residual oil needs to be ejected in the vicinity of the interlayer and/or the low physical property section, but an interlayer or a low physical property section and a water flow dominant channel need to be avoided. And one skilled in the art can determine the well section with relatively enriched residual oil according to the field operation requirement and the common technical knowledge in the field and finally determine that the well section with relatively enriched residual oil is shot at a specific position near the interlayer and/or the low physical property section.
As a specific embodiment of the above method of the present invention, wherein, for the injection well, step 4: and (3) optimizing a perforation scheme of the polymer flooding composite flooding of the thick-layer sandstone reservoir by combining the analysis results in the steps 1-3, wherein the perforation scheme comprises the following steps:
perforating corresponding to a production well around an injection well, and if an interlayer and/or a low-physical-property section exist in the thick-layer sandstone reservoir, perforating a well section with relatively enriched residual oil, but avoiding the interlayer or the low-physical-property section and avoiding a water flow dominant channel; and if no interlayer and low-physical-property section exists in the thick-layer sandstone reservoir, jetting a residual oil enrichment well section at the top of the thick-layer sandstone reservoir.
In the method of the invention, the injection wells and the production wells around the injection wells are perforated correspondingly to ensure that the injection wells and the production wells around the injection wells are injected and produced correspondingly, and the perforated injection and production well sections are communicated.
The invention solves the problems of unobvious effect of the produced well at the gathering surface combination flooding stage or unobvious effect of gathering for a long time caused by medicament injection sinking, low efficiency and ineffective circulation in the traditional general perforation mode by optimizing the perforation method, further expands the underground swept volume of the injected medicament, effectively displaces the residual oil, effectively improves the yield of the oil well and further improves the recovery ratio of the gathering surface combination flooding.
On the other hand, the invention also provides a perforation optimization device for improving the polymer flooding composite flooding effect of the thick-layer sandstone reservoir, wherein the device comprises:
the distribution rule identification unit of the residual oil in the thick-layer sandstone oil reservoir: the method is used for identifying the distribution rule of residual oil in the thick-layer sandstone reservoir;
the distribution characteristic identification unit of the internal interlayer and the low physical property section of the thick-layer sandstone reservoir: the method is used for identifying the distribution characteristics of the internal interlayer and the low physical property section of the thick-layer sandstone reservoir;
the internal water flow advantage channel position determining unit of the thick-layer sandstone reservoir: the method is used for identifying inefficient and ineffective water circulation and determining the position of a water flow dominant channel inside the thick-layer sandstone reservoir;
the perforation scheme optimization unit of the thick-layer sandstone reservoir poly-surface combined flooding comprises the following steps: the method is used for optimizing the perforation scheme of the polymer flooding combination flooding of the thick-layer sandstone reservoir by combining the distribution rule identification unit of residual oil in the thick-layer sandstone reservoir, the distribution characteristic identification unit of an interlayer and a low physical property section in the thick-layer sandstone reservoir and the analysis result of the water flow dominant channel position determination unit in the thick-layer sandstone reservoir.
In yet another aspect, the present invention further provides a computer device, which includes a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the steps of the perforation optimization method for improving the accumulation table complex flooding effect of the heavy-bed sandstone reservoir.
In still another aspect, the present invention further provides a computer readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the steps of the perforation optimization method for improving the polymer flooding composite flooding effect of the heavy-bed sandstone reservoir.
The perforation optimization method for improving the polymer flooding effect of the thick-layer sandstone oil reservoir firstly identifies the distribution pattern of the residual oil in the thick-layer sandstone oil reservoir, the distribution characteristics of the interlayer and the low-physical-property section in the thick-layer sandstone oil reservoir, determines the position of the water flow advantage channel, and then combines the distribution pattern of the residual oil, the distribution characteristics of the interlayer and the low-physical-property section in the thick-layer sandstone oil reservoir and the identification of the water flow advantage channel to optimize perforation, so that the effect of each well is ensured, the effective use of the residual oil is realized, and the yield of a single well is further improved.
In addition, the perforation optimization method provided by the invention is simple and easy to implement, the effect of polymer flooding can be improved, the medicament cost is effectively reduced, and the benefit maximization is realized.
Drawings
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 will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a process flow diagram of a perforation optimization method for improving the polymer flooding effect of the heavy-bed sandstone reservoir according to the embodiment of the invention.
FIG. 2a is a schematic diagram of the distribution of residual oil in the production well C6-A336 in an embodiment of the present invention.
FIG. 2b is a schematic representation of the remaining oil distribution in the production well 6-AT316 well in an embodiment of the present invention.
FIG. 2c is a schematic representation of the remaining oil distribution for well group 6-A326 in an embodiment of the present invention.
FIG. 3 is a schematic diagram of identifying a low property segment by a water absorption profile in an embodiment of the present invention.
FIG. 4 is a schematic view showing the distribution of the interlayer and the low-physical section in the embodiment of the present invention.
Figure 5 is a plot of injector apparent drag coefficients for a particular embodiment of the present invention.
FIG. 6 is a concentration profile for a production well in an embodiment of the present invention.
FIG. 7a is a production curve for production wells C6-A336 in an embodiment of the present invention.
FIG. 7b is a production curve for a production well 6-AT316 well in an example embodiment of the invention.
FIG. 8a is a graph illustrating the monitoring of chloride ion content in the production well C6-A336 in accordance with an embodiment of the present invention.
FIG. 8b is a graph of chlorine ion content monitoring for a production well 6-AT316 well in an embodiment of the present invention.
Figure 9 is a water absorption profile for an injection well in an embodiment of the present invention.
Figure 10 is a schematic diagram of an optimized perforation scheme for production and injection wells in an embodiment of the present invention.
Fig. 11 is a schematic structural diagram of a perforation optimization device for improving the polymer flooding effect of the thick-layer sandstone reservoir according to the embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present specification, the terms "comprising," "including," "having," "containing," and the like are used in an open-ended fashion, i.e., to mean including, but not limited to. Reference to the description of the terms "one embodiment," "a particular embodiment," "some embodiments," "for example," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. The sequence of steps involved in the embodiments is for illustrative purposes to illustrate the implementation of the present application, and the sequence of steps is not limited and can be adjusted as needed.
The method is characterized in that if a thick-layer sandstone reservoir is developed according to a perforation mode of a thin-layer or medium-layer reservoir, namely, all target layers of a production well are shot, an injection well is correspondingly perforated, and the polymer flooding effect is poor (the reason is that the injection agent can generate a bottom sinking phenomenon in an interlayer and a thick layer with non-developed low-physical-property section and is extracted from the middle lower part of the production well, or the injection agent can perform low-efficiency and ineffective circulation through a water flow dominant channel, the production well shows that the effect is not obvious or the polymer flooding effect is not effective for a long time, the injection well shows that the apparent resistance coefficient is low, the expansion effect and the volume effect of the agent are poor, the residual oil is difficult to be effectively displaced, and the perforation mode not only wastes chemical agents, but also influences the polymer flooding effect). The method comprises the steps of firstly identifying the distribution pattern of the residual oil in the thick-layer sandstone oil reservoir, the distribution characteristics of the interlayer and the low-physical-property section in the thick-layer sandstone oil reservoir, determining the position of a water flow advantage channel, and then combining the distribution pattern of the residual oil, the distribution characteristics of the interlayer and the low-physical-property section in the thick-layer sandstone oil reservoir and the identification of the water flow advantage channel to optimize perforation. The perforation optimization method for improving the polymer flooding effect of the thick-layer sandstone oil reservoir can ensure the effect of each well, realize effective utilization of residual oil and further improve the yield of a single well, is simple and easy to implement, can improve the polymer flooding effect, effectively reduces the medicament cost and realizes the maximization of the benefit.
Fig. 1 is a process flow diagram of a perforation optimization method for improving the polymer flooding effect of a thick-layer sandstone reservoir according to an embodiment of the present invention, and as can be seen from fig. 1, the method includes the following specific steps:
step 1: identifying a distribution rule of residual oil in the thick-layer sandstone oil reservoir;
step 2: identifying the distribution characteristics of an internal interlayer and a low physical property section of the thick-layer sandstone reservoir;
and step 3: identifying inefficient and ineffective water circulation, and determining the position of a water flow dominant channel inside the thick-layer sandstone reservoir;
and 4, step 4: and (4) optimizing the perforation scheme of the polymer-surfactant combination flooding of the thick-layer sandstone oil reservoir by combining the analysis results in the steps 1-3.
In step 1 of one embodiment, logging or core data is used to determine the location of remaining oil within a heavy sandstone reservoir to initially screen the perforated interval.
In an embodiment, the remaining oil locations within the thick-layer sandstone reservoir include a top of a thick-layer sandstone reservoir oil layer, an internal interlayer of the thick-layer sandstone reservoir, and/or a low physical property section.
In step 2 of one embodiment, the logging data and the laboratory test data and/or dynamic data are used to identify internal interbeddings and low physical sections of the thick-layer sandstone reservoir.
In one embodiment, the dynamic data includes a water absorption profile.
In step 3 of an embodiment, the dynamic monitoring data is used to identify inefficient and ineffective water circulation and determine the position of the water flow dominant channel inside the thick-layer sandstone reservoir.
In step 3 of an embodiment, if the early stage lacks dynamic monitoring data to identify inefficient and ineffective water circulation, data logging is enhanced in the meter focusing composite flooding stage, a water flow dominant channel is found out, perforation is optimized and adjusted in time, and the water flow dominant channel is plugged in time, so that the meter focusing composite flooding effect is ensured.
In one embodiment, for a production well, step 4: and (3) optimizing a perforation scheme of the polymer flooding composite flooding of the thick-layer sandstone reservoir by combining the analysis results in the steps 1-3, wherein the perforation scheme comprises the following steps:
and if an interlayer and a low-physical-property section exist in the thick-layer sandstone oil reservoir, jetting a well section with relatively enriched residual oil, but avoiding the interlayer or the low-physical-property section and avoiding a water flow dominant channel, and if no interlayer and low-physical-property section exists in the thick-layer sandstone oil reservoir, jetting a residual oil enriched well section at the top of the thick-layer sandstone oil reservoir.
In one embodiment, for an injection well, step 4: and (3) optimizing a perforation scheme of the polymer flooding composite flooding of the thick-layer sandstone reservoir by combining the analysis results in the steps 1-3, wherein the perforation scheme comprises the following steps:
perforating corresponding to a production well around an injection well, and if an interlayer and/or a low-physical-property section exist in the thick-layer sandstone reservoir, perforating a well section with relatively enriched residual oil, but avoiding the interlayer or the low-physical-property section and avoiding a water flow dominant channel; and if the interior of the thick-layer sandstone oil reservoir has no interlayer and low physical property section, jetting out the residual oil enrichment well section at the top of the thick-layer sandstone oil reservoir.
The perforation optimization method for improving the polymer flooding effect of the thick-layer sandstone reservoir provided by the embodiment of the invention is specifically described by taking a certain layer of J16 Xinglong platform oil layers of the Liaohe oil field as an example.
Selecting a certain layer of J16 Xinglong platform oil layers of the Liaohe oil field to carry out a thick-layer gathering surface composite flooding pilot test, designing 5-injection 10-production in a test area, carrying out perforation optimization on a production well and an injection well in order to ensure the effect of gathering surface composite flooding, selecting two production wells in a typical well group 6-A326 to discuss in detail, wherein the perforation optimization process mainly comprises the following steps:
(1) the digital comprehensive log is used for identifying the residual oil distribution of the oil wells, the residual oil distribution schematic diagrams of the two producing wells and the well group 6-A326 are respectively shown in figures 2 a-2 c, and as can be seen from figures 2 a-2 c, the residual oil of the third 6-A336 well is relatively enriched near the interlayer and the low physical property section, the residual oil of the 6-AT316 well is relatively enriched AT the top of the thick layer and the No. 53 layer, and the residual oil of the 6-A326 well is relatively enriched AT the top of the thick layer and near the interlayer and the low physical property section.
(2) The accurate identification of the interlayer and the low-physical-property segment is a precondition for optimizing perforation, the interlayer can be identified by adopting a conventional method in the field, and the interlayer of a block to which the interlayer belongs is identified by utilizing the relationship between micro-potential, micro-gradient, 0.45m gradient, deep lateral resistivity return value and electrical property of oil-bearing property in each oil field at present.
The interlayer in this example comprises mudstone and siltstone with a permeability of less than 100 mD.
The identification of the low-physical property segment in the embodiment is obtained through the mine practice of a J16 industrial experimental area, and it can be analyzed from the water absorption profile that the segment with the permeability of less than 500mD has little influence on water injection, but has a large influence on the chemical agent, and plays a certain degree of sealing effect on the chemical agent (as shown in fig. 3). The distribution of the interlayers and low physical segments in the examples were characterized using the methods described above (as shown in fig. 4).
(3) Because early dynamic monitoring data of the J16 Xinglong platform thick-layer test area in the Liaohe oil field is relatively lacked, the method is not enough to identify low-efficiency and invalid water circulation and determine the position of a water flow dominant channel, the influence of the aspect is not considered temporarily, and a perforation optimization scheme is directly established. And (3) opening the residual oil enrichment well section, opening the production well 6-A336 well to avoid the interlayer and the low-physical-property section, and opening the residual oil enrichment well section, namely the top of the thick layer and the No. 56 small layer, of the production well 6-AT316 well to avoid the low-physical-property section.
(4) After the development is put into operation, the recording work of dynamic data is enhanced, and the position of the water flow dominant channel is determined by analyzing and identifying inefficient and ineffective water circulation. In the polymer flooding stage, the apparent resistance coefficient of the injection well is equivalent to that of the water flooding stage and has a descending trend (as shown in fig. 5), the production well 6-AT316 shows that the concentration is high, the effect is not achieved for a long time, the content of chloride ions in produced liquid is not obviously changed, the concentration of the production well C6-A336 shows that the concentration is high, the precipitation and oil increasing effects are seen, but the effect time is short, the content of chloride ions in produced liquid is firstly increased and then reduced (as shown in fig. 6, 7a, 7b, 8a and 8 b), and the phenomena all prove that the low-efficiency and ineffective water circulation is achieved, injected fluid is produced from the production well along a water flow dominant channel, and the wave and volume expansion effect is not achieved in a thick layer inside.
And judging the position of the water flow dominant channel by using the water absorption profile, wherein the water absorption proportion of the middle lower part of the injection well reaches more than 90 percent, so that the water flow dominant channel exists in the middle lower part of the thick layer (figure 9), and finally, performing perforation optimization on the extraction well and the injection well, namely plugging the water flow dominant channel in the middle lower part of the thick layer (figure 10).
After optimization and adjustment, the water content of the production well C6-A336 is reduced from 93% to 82%, the stage oil increasing amount is 1271 tons, the water content of the production well C6-AT 316 is reduced from 100% to 86%, and the stage oil increasing amount is 3382 tons, so that the poly-surface combined flooding oil increasing and water reducing effect is obvious.
The above example is only an example of one well group in a Liaohe oilfield J16 Xinglong platform thick layer test area, wherein 13 wells are used for perforation optimization in the test area, the comprehensive water content of the thick layer test area is reduced from 95.8% to 89.9% by 8 months in 2020, and the accumulated oil increase is 10278 tons. The embodiment of the invention shows that the perforation optimization method for the accumulation surface combination flooding of the thick-layer sandstone oil reservoir can improve the accumulation surface combination flooding development effect, save chemical agents and maximize the benefit.
Based on the same inventive concept, the embodiment of the invention also provides a perforation optimization device for improving the polymer flooding effect of the thick-layer sandstone reservoir, and as the principle of solving the problems of the device is similar to the perforation optimization method for improving the polymer flooding effect of the thick-layer sandstone reservoir, the implementation of the device can refer to the implementation of the method, and repeated parts are not repeated. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. The means described in the embodiments below are preferably implemented in hardware, but implementations in software or a combination of software and hardware are also possible and contemplated.
Fig. 11 is a schematic structural diagram of a perforation optimization device for improving the polymer flooding effect of the thick-layer sandstone reservoir according to the embodiment of the present invention. As shown in fig. 11, the perforation optimization device for improving the polymer flooding effect of the thick-layer sandstone reservoir comprises:
the distribution rule recognition unit 1101 of the residual oil in the thick-layer sandstone oil reservoir: the method is used for identifying the distribution rule of residual oil in the thick-layer sandstone reservoir;
the distribution characteristic identification unit 1102 of the internal interlayer and the low physical property section of the thick-layer sandstone reservoir: the method is used for identifying the distribution characteristics of the internal interlayer and the low physical property section of the thick-layer sandstone reservoir;
determining unit 1103 for internal water flow dominant channel of thick-layer sandstone reservoir: the method is used for identifying inefficient and ineffective water circulation and determining the position of a water flow dominant channel inside the thick-layer sandstone reservoir;
the thick-layer sandstone reservoir poly-surface combined flooding perforation scheme optimizing unit 1104: the method is used for optimizing the perforation scheme of the polymer flooding combination flooding of the thick-layer sandstone reservoir by combining the distribution rule identification unit of residual oil in the thick-layer sandstone reservoir, the distribution characteristic identification unit of an interlayer and a low physical property section in the thick-layer sandstone reservoir and the analysis result of the water flow dominant channel position determination unit in the thick-layer sandstone reservoir.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor, wherein the processor executes the computer program to realize the steps of the perforation optimization method for improving the accumulation table composite flooding effect of the thick-layer sandstone reservoir.
The embodiment of the invention also provides a computer-readable storage medium, on which a computer program is stored, wherein the computer program is executed by a processor to implement the steps of the perforation optimization method for improving the accumulation table combination flooding effect of the thick-layer sandstone reservoir.
The perforation optimization method for improving the polymer flooding effect of the thick-layer sandstone oil reservoir provided by the embodiment of the invention is characterized by firstly identifying the distribution pattern of the residual oil in the thick-layer sandstone oil reservoir, the distribution characteristics of the interlayer and the low physical property section in the thick-layer sandstone oil reservoir, determining the position of the water flow advantage channel, and then combining the distribution pattern of the residual oil, the distribution characteristics of the interlayer and the low physical property section in the thick-layer sandstone oil reservoir and the identification of the water flow advantage channel to optimize perforation, so that the effect of each well is ensured, the effective use of the residual oil is realized, and the yield of a single well is improved.
In addition, the perforation optimization method provided by the embodiment of the invention is simple and easy to implement, the effect of polymer flooding can be improved, the medicament cost is effectively reduced, and the benefit maximization is realized.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (12)
1. A perforation optimization method for improving the polymer flooding effect of a thick-layer sandstone reservoir is characterized by comprising the following steps:
step 1: identifying a distribution rule of residual oil in the thick-layer sandstone oil reservoir;
step 2: identifying the distribution characteristics of an internal interlayer and a low physical property section of the thick-layer sandstone reservoir;
and step 3: identifying inefficient and ineffective water circulation, and determining the position of a water flow dominant channel inside the thick-layer sandstone reservoir;
and 4, step 4: and (3) optimizing the perforation scheme of the polymer flooding composite flooding of the thick-layer sandstone reservoir by combining the analysis results in the steps 1-3.
2. The method of claim 1, wherein in step 1, logging or core data is used to determine the location of remaining oil within the heavy sandstone reservoir to initially screen the perforation interval.
3. The method of claim 2, wherein the location of remaining oil within the thick-layer sandstone reservoir comprises a top of a thick-layer sandstone reservoir oil layer, an interior interlayer of a thick-layer sandstone reservoir, and/or a low physical property segment.
4. The method of claim 1, wherein in step 2, logging data and laboratory test data and/or dynamic data are used to identify internal interbeddings and low physical sections of the thick-layer sandstone reservoir.
5. The method of claim 4, wherein the dynamic data comprises a water uptake profile.
6. The method of claim 1, wherein in step 3, the dynamic monitoring data is used to identify inefficient and ineffective water circulation and determine the position of the water flow dominant channel inside the thick-layer sandstone reservoir.
7. The method as claimed in claim 1 or 6, wherein in step 3, if the dynamic monitoring data is lacked in early stage to identify inefficient and ineffective water circulation, the data logging is enhanced in the stage of the polymer flooding, the water flow dominant channel is found out, the perforation is optimized and adjusted in time, and the water flow dominant channel is blocked in time to ensure the polymer flooding effect.
8. The method of any one of claims 1-7, wherein for a production well, step 4: and (3) optimizing a perforation scheme of the polymer flooding composite flooding of the thick-layer sandstone reservoir by combining the analysis results in the steps 1-3, wherein the perforation scheme comprises the following steps:
and if an interlayer and/or a low-physical-property section exist in the thick-layer sandstone oil reservoir, jetting a well section with relatively enriched residual oil, but avoiding the interlayer or the low-physical-property section and avoiding a water flow dominant channel, and if no interlayer and low-physical-property section exist in the thick-layer sandstone oil reservoir, jetting the residual oil enriched well section at the top of the thick-layer sandstone oil reservoir.
9. The method of any one of claims 1-7, wherein for an injection well, step 4: and (3) optimizing a perforation scheme of the polymer flooding composite flooding of the thick-layer sandstone reservoir by combining the analysis results in the steps 1-3, wherein the perforation scheme comprises the following steps:
perforating corresponding to a production well around an injection well, and if an interlayer and/or a low-physical-property section exist in the thick-layer sandstone reservoir, perforating a well section with relatively enriched residual oil, but avoiding the interlayer or the low-physical-property section and avoiding a water flow dominant channel; and if no interlayer and low-physical-property section exists in the thick-layer sandstone reservoir, jetting a residual oil enrichment well section at the top of the thick-layer sandstone reservoir.
10. A perforation optimization device for improving the polymer flooding effect of a thick-layer sandstone oil reservoir is characterized by comprising:
the distribution rule identification unit of the residual oil in the thick-layer sandstone oil reservoir: the method is used for identifying the distribution rule of residual oil in the thick-layer sandstone reservoir;
the distribution characteristic identification unit of the internal interlayer and the low physical property section of the thick-layer sandstone reservoir: the method is used for identifying the distribution characteristics of the internal interlayer and the low physical property section of the thick-layer sandstone reservoir;
the internal water flow advantage channel position determining unit of the thick-layer sandstone reservoir: the method is used for identifying inefficient and ineffective water circulation and determining the position of a water flow dominant channel inside the thick-layer sandstone reservoir;
the perforation scheme optimization unit of the thick-layer sandstone reservoir poly-surface combined flooding comprises the following steps: the method is used for optimizing the perforating scheme of the heavy-layer sandstone reservoir poly-surface combined flooding by combining the distribution rule identification unit of the residual oil in the heavy-layer sandstone reservoir, the distribution characteristic identification unit of the internal interlayer and the low-physical-property section of the heavy-layer sandstone reservoir and the analysis result of the water flow dominant channel position determination unit in the heavy-layer sandstone reservoir.
11. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program implements the steps of the perforation optimization method for improving the poly-epitopic composite flooding effect of a thick-bed sandstone reservoir of claim 1.
12. A computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the perforation optimization method for improving the poly-epitopic composite flooding effect of a thick-bed sandstone reservoir of claim 1.
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