A method and system for identifying edge water intrusion in heavy oil reservoirs

Abstract

The invention discloses a method and system for identifying edge water invasion of heavy oil reservoirs, wherein the method comprises: acquiring reservoir development data; performing well logging response analysis according to the reservoir development data to obtain well logging response data; analyzing oil well production characteristics according to the reservoir development data to obtain oil well production characteristic data; collecting oil well produced water, performing salinity analysis on the oil well produced water to obtain produced water salinity; analyzing water breakthrough time according to the structural position of the production well and the distance between the production well and edge water to obtain water breakthrough time of the production well; analyzing formation pressure changes after edge water invasion occurs in the heavy oil reservoir to obtain formation pressure data; identifying the layer, time and plane distribution range of the reservoir edge water invasion according to the well logging response data, oil well production characteristic data, produced water salinity, water breakthrough time of the production well and formation pressure data.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum development, and in particular to a method and system for identifying edge water intrusion in a heavy oil reservoir. Background Art

[0002] Most heavy oil reservoirs are edge water reservoirs. With the continuous development of the reservoirs, the formation pressure gradually decreases, and the edge water continues to invade the reservoirs. Therefore, the identification and detailed description of the edge water invasion of the reservoirs are the key factors affecting the further effective development of heavy oil reservoirs.

[0003] In the prior art, the development methods of heavy oil reservoirs mainly include steam stimulation, steam drive, SAGD, steam-assisted gravity drainage and fire drive. Among them, these development mechanisms are to inject high-temperature steam or air into the reservoir through a steam injection well so that the crude oil is oxidized and burned inside the reservoir to generate heat energy, and the viscosity of the underground crude oil is reduced through heat exchange so that it flows to the wellhead for production. In the reservoir engineering design, each heavy oil thermal recovery method must consider avoiding edge water of more than 150m to prevent edge water from invading the reservoir and causing the reservoir to be flooded and scrapped. Therefore, the identification of edge water intrusion in heavy oil reservoirs is particularly important.

[0004] At present, no technical solution for effectively identifying edge water intrusion in heavy oil reservoirs has been proposed in the prior art. Summary of the invention

[0005] The present invention proposes a method and system for identifying edge water invasion of heavy oil reservoirs. By utilizing the changing characteristics and laws of parameters such as logging response, production well fluid volume, produced water salinity, water breakthrough time of production wells, and formation pressure, a scheme for effectively identifying the stratum, time, and plane distribution range of edge water invasion of oil reservoirs is established. This method can effectively identify edge water invasion of heavy oil reservoirs and lay a foundation for potential tapping, adjustment, and transformation of development methods of heavy oil reservoirs.

[0006] In a first aspect of an embodiment of the present invention, a method for identifying edge water intrusion in a heavy oil reservoir is provided, the method comprising:

[0007] Obtaining reservoir development data;

[0008] Performing well logging response analysis based on the reservoir development data to obtain well logging response data;

[0009] Analyze the oil well production characteristics according to the oil reservoir development data to obtain oil well production characteristic data;

[0010] Collecting produced water from the oil well, performing mineralization analysis on the produced water from the oil well, and obtaining the mineralization of the produced water;

[0011] Analyze the water breakthrough time according to the structural position of the production well and the distance between the production well and the edge water to obtain the water breakthrough time of the production well;

[0012] Analyze the formation pressure changes after edge water invasion in heavy oil reservoirs and obtain formation pressure data;

[0013] Based on the logging response data, oil well production characteristic data, produced water salinity, water breakthrough time of production wells and formation pressure data, the layer, time and plane distribution range of reservoir edge water invasion are identified.

[0014] In a second aspect of an embodiment of the present invention, a system for identifying edge water intrusion in a heavy oil reservoir is provided, the system comprising:

[0015] A data acquisition unit, used for acquiring reservoir development data;

[0016] A well logging analysis unit, used for performing well logging response analysis based on the reservoir development data to obtain well logging response data;

[0017] An oil well production analysis unit, used for analyzing oil well production characteristics according to the oil reservoir development data to obtain oil well production characteristic data;

[0018] A mineralization analysis unit is used to collect produced water from the oil well, perform mineralization analysis on the produced water from the oil well, and obtain the mineralization of the produced water;

[0019] The water breakthrough time analysis unit is used to analyze the water breakthrough time according to the structural position of the production well and the distance between the production well and the edge water, and obtain the water breakthrough time of the production well;

[0020] The formation pressure analysis unit is used to analyze the formation pressure changes after edge water invasion occurs in heavy oil reservoirs and obtain formation pressure data;

[0021] The edge water intrusion identification unit is used to identify the layer, time and plane distribution range of the edge water intrusion of the reservoir based on the logging response data, oil well production characteristic data, produced water salinity, water breakthrough time of the production well and formation pressure data.

[0022] In a third aspect of an embodiment of the present invention, a computer device is proposed, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements a method for identifying edge water intrusion in a heavy oil reservoir when executing the computer program.

[0023] In a fourth aspect of an embodiment of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, a method for identifying edge water intrusion in a heavy oil reservoir is implemented.

[0024] The method and system for identifying edge water invasion of heavy oil reservoirs proposed by the present invention obtain reservoir development data; perform logging response analysis based on the reservoir development data to obtain logging response data; analyze oil well production characteristics based on the reservoir development data to obtain oil well production characteristic data; collect oil well produced water, perform salinity analysis on the oil well produced water to obtain produced water salinity; analyze water breakthrough time based on the structural position of the production well and the distance between the production well and edge water to obtain water breakthrough time of the production well; analyze formation pressure changes after edge water invasion occurs in the heavy oil reservoir to obtain formation pressure data; identify the layer, time and plane distribution range of edge water invasion of the reservoir based on logging response data, oil well production characteristic data, produced water salinity, water breakthrough time of the production well and formation pressure data, and the identification result is comprehensive, low-cost and effective, laying a solid foundation for potential tapping, adjustment and transformation of development methods of edge water heavy oil reservoirs, and providing reference for similar reservoir development. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 The present invention is a flowchart of a method for identifying edge water intrusion in a heavy oil reservoir according to an embodiment of the present invention.

[0027] Figure 2 It is a schematic diagram of well location distribution in a well area according to a specific embodiment of the present invention.

[0028] Figure 3A and Figure 3B They are respectively schematic diagrams of playback curves of Well 014-223 before and after water invasion according to a specific embodiment of the present invention.

[0029] Figure 4 It is a schematic diagram of a typical water invasion well production curve according to a specific embodiment of the present invention.

[0030] Figure 5 It is a schematic diagram of the production curve of the 11-24C well in the low part of the structure of a specific embodiment of the present invention.

[0031] Figure 6 It is a schematic diagram of the production curve of the 012-23C2 well at the structural high point of a specific embodiment of the present invention.

[0032] Figure 7 It is a schematic plan view of block pressure distribution according to a specific embodiment of the present invention.

[0033] Figure 8It is a schematic diagram of the architecture of a system for identifying edge water intrusion in heavy oil reservoirs according to an embodiment of the present invention.

[0034] Fig. 9 It is a schematic diagram of the structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The principles and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0036] Those skilled in the art will appreciate that the embodiments of the present invention may be implemented as a system, device, apparatus, method or computer program product. Therefore, the present disclosure may be specifically implemented in the following forms, namely: complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0037] According to an embodiment of the present invention, a method and system for identifying edge water intrusion in a heavy oil reservoir are proposed.

[0038] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0039] Figure 1 FIG. 1 is a flow chart of a method for identifying edge water intrusion in a heavy oil reservoir according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0040] Step S101, obtaining reservoir development data;

[0041] Step S102, performing well logging response analysis based on the reservoir development data to obtain well logging response data;

[0042] Step S103, analyzing the oil well production characteristics according to the oil reservoir development data to obtain oil well production characteristic data;

[0043] Step S104, collecting produced water from the oil well, and performing a mineralization analysis on the produced water from the oil well to obtain the mineralization of the produced water;

[0044] Step S105, analyzing the water breakthrough time according to the structural position of the production well and the distance between the production well and the edge water to obtain the water breakthrough time of the production well;

[0045] Step S106, analyzing the formation pressure change after edge water invasion occurs in the heavy oil reservoir to obtain formation pressure data;

[0046] Step S107, identifying the layer, time and plane distribution range of reservoir edge water invasion based on logging response data, oil well production characteristic data, produced water salinity, water breakthrough time of production wells and formation pressure data.

[0047] In order to explain the above-mentioned identification method of edge water intrusion in heavy oil reservoirs more clearly, each step is explained in detail below.

[0048] Step S101:

[0049] Obtain reservoir development data.

[0050] Step S102:

[0051] Analyze the formation water content and ion concentration value in the original oil layer according to the reservoir development data, and obtain the oil layer resistivity and the flushing zone resistivity according to the formation water content and ion concentration value;

[0052] The microelectrode resistance value is obtained according to the resistivity of the flushing zone, and the change of the natural potential is obtained according to the electromotive force generated by the diffusion of ion concentration. The changes of the oil layer resistivity, microelectrode resistance value and natural potential are sorted out to obtain the logging response data.

[0053] Specifically, with the continuous development of the main body of the edge water reservoir, the internal pressure of the reservoir continues to decrease, causing the edge water to invade the main body of the reservoir under the action of formation pressure, and the oil in the original rock pores and throats is replaced by formation water, resulting in a continuous increase in the formation water content in the original oil layer and an increase in ion concentration. Due to the conductivity of ions, the resistivity of the original oil layer is greatly reduced, and the resistivity of the flushing zone is also reduced, resulting in a significant decrease in the resistance of the microelectrode curve; at the same time, the generation of natural potential is determined by the electromotive force generated by ion diffusion. The increase in ion concentration significantly increases the electromotive force generated by diffusion, so the amplitude difference of the natural potential increases significantly.

[0054] Step S103:

[0055] According to the reservoir development data, the liquid production and oil production are obtained;

[0056] According to the liquid production and oil production, the ratio of the mobility of formation water to that of heavy oil is obtained as the production characteristic data of the oil well.

[0057] Among them, as the reservoir development stage continues to deepen, the internal pressure of the reservoir gradually decreases, and the edge water continues to invade the main body of the reservoir under the action of external pressure. After being produced by the production wells, the bottom hole pressure of the oil wells is supplemented due to the invasion of edge water, which increases the liquid volume. The mobility ratio (K / μ) of formation water and heavy oil is very different. The flow rate of formation water is much greater than the flow rate of crude oil, so that water is mainly present in the produced fluid. The greater the viscosity of the heavy oil reservoir, the higher the water content of the produced fluid, until it is all water.

[0058] Step S104:

[0059] Collect water samples at the first sampling time point and the second sampling time point of the oil well, and perform mineralization analysis to obtain the mineralization of produced water;

[0060] The produced water mineralization is compared to obtain a produced water mineralization change value, and the nature of the produced water is determined, wherein the nature of the produced water is formation water, steam condensate, or a mixture of the above.

[0061] Among them, the mineralization of oil well produced water is close to that of formation water, and much higher than that of injected steam water (the injected high-temperature steam water has a very low mineralization after treatment), and is analyzed as formation water.

[0062] Step S105:

[0063] Analyze the water breakthrough time according to the structural position of the production well and the distance between the production well and the edge water to obtain the water breakthrough time of the production well;

[0064] The advancement process of production of the production well and edge water intrusion is constructed according to the water breakthrough time of the production well, and the characteristics of edge water intrusion are obtained.

[0065] Among them, according to the structural position of the production well and the distance from the edge water, the edge water invades faster in the low part of the structure and close to the edge water, and the production well sees water earlier. The edge water invades later in the relatively high part of the structure and far from the edge water, and the production well sees water later. The water emergence time is generally shown as a process of advancing from the low part of the structure to the high part.

[0066] Step S106:

[0067] Compare the formation pressure of production wells in the early stage of development with the formation pressure after edge water invasion to obtain the formation pressure change;

[0068] According to the formation pressure change, a corresponding relationship between the structural position and the formation pressure change is established to obtain formation pressure data.

[0069] Among them, after edge water invasion occurs in heavy oil reservoirs, the edge water continuously replenishes the pressure lost in the original formation due to fluid production from the edge of the reservoir to the main part, and the formation pressure drop gradually increases from the low part to the high part of the structure.

[0070] Step S107:

[0071] By using the changing characteristics and laws of parameters such as logging response, production well fluid volume, produced water salinity, water breakthrough time of production wells, and formation pressure, the characteristics of edge water invasion in heavy oil reservoirs can be judged and described, and the stratum, time, and plane distribution range of edge water invasion in reservoirs can be effectively identified.

[0072] It should be noted that, although the operations of the method of the present invention are described in a specific order in the above embodiments and the accompanying drawings, this does not require or imply that the operations must be performed in the specific order, or that all the operations shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0073] In order to explain the above-mentioned method for identifying edge water intrusion in heavy oil reservoirs more clearly, a specific embodiment is described below. However, it should be noted that this embodiment is only for better illustrating the present invention and does not constitute an improper limitation to the present invention.

[0074] The following is a detailed explanation of the identification method of edge water intrusion in heavy oil reservoirs by taking a fire drive block in Jinzhou Oil Production Plant of Liaohe Oilfield as an example.

[0075] The oil layer of the block is buried at a depth of 900 to 1060 meters. The overall structure of the top surface of the building is a monocline structure inclined to the southeast. It has the characteristics of long oil-bearing well sections, many oil layers, thin single layer thickness, and poor sand body continuity in the vertical direction. It is a typical deep layered heavy oil edge water reservoir. The current development method to be adopted is fire drive mining. In order to clarify the degree of edge water invasion of each oil layer, it is urgent to establish an edge water invasion identification method to determine the edge water invasion location.

[0076] Step S01, logging response analysis:

[0077] refer to Figure 2 , is a schematic diagram of the well area and well location distribution of a specific embodiment of the present invention. Figure 2 As shown, Well 014-223 located in the edge water area was drilled in 1997 and is in the original reservoir state. The resistivity of the interpreted layers 10 and 11 corresponding to Group I is 80-100Ω·m. The natural potential curve is mainly characterized by low amplitude and relatively straightness, with a small amplitude difference. The resistivity of the microelectrode curve is generally 5-8Ω·m.

[0078] After the huff-and-puff development in this area, due to the close distance to the edge water, the internal pressure of the reservoir decreased due to the huff-and-puff, and the edge water invaded the main area of ​​the reservoir. In 2018, the Jin 45-014-Geng 223 well, which was implemented at a distance of 30m from the well, showed obvious water flooding in the interpretation layers 10 and 11 in Group I, which were equivalent to the original well (interpretation layers 10 and 11 in well 014-223). The resistivity dropped sharply to only 20-30Ω·m, and the natural potential curve showed an obvious positive abnormal amplitude difference. The resistance value of the microelectrode was significantly reduced (the resistance value was 3-5Ω·m). The playback curves of well 014-223 before and after water invasion are shown in the following figure: Figure 3A and Figure 3BAs shown in the figure, the line segments A and B marked in the figure are comparison marking lines, and the comparison table of logging responses before and after water invasion is shown in Table 1.

[0079] Table 1 Comparison of logging responses before and after water invasion

[0080]

[0081] Step S02, oil well production characteristics analysis:

[0082] The production characteristics of the oil well 015-21 were analyzed. Well 015-21 was put into production in the floor oil layer in March 1998, with a perforation section of 954.5-992.4m, 23.7m / 11 layers, and a daily oil production of 3t, daily liquid production of 20t, and a water content of 85% before water invasion. Since March 2002, the edge water began to gradually invade, and the daily oil production dropped to less than 1t, the daily liquid production was about 50t and remained stable, and the water content was close to 100%. Compared with the production characteristics before water invasion, the daily oil production decreased or disappeared, the daily liquid production increased significantly and was stable, and the water content increased to or close to 100%. Figure 4 The following is a typical water invasion well production curve.

[0083] Step S03, formation water mineralization analysis:

[0084] The formation water mineralization of Well 015-21 was analyzed. The formation water type of Yulou oil layer is NaHCO3 type, and the total mineralization is 1960mg / L on average. Before the edge water invasion in August 2002, the water samples of Well 015-21 were analyzed and the total mineralization was 1030mg / L, which was much lower than the original formation water mineralization. This was because the steam mineralization injected by the steam huff-and-puff production of this well was very low, and the formation water was desalinated and diluted by the injected water. In October 2003, the water samples of this well were analyzed again, and the total mineralization was 1820mg / L. The formation water mineralization increased significantly, close to the original formation water mineralization. The reason is that with the continuous invasion of the edge water of the reservoir, the formation water is continuously replenished from the outside of the reservoir to the inside (Table 2).

[0085] Table 2 Analysis of formation water mineralization in Well 015-21

[0086]

[0087]

[0088] Step S04, analysis of water breakthrough time of production wells:

[0089] The water breakthrough time of Well 11-24C and Well 012-23C was analyzed. Well 11-24C and Well 012-23C are two production wells in the Yulou oil layer, 90 meters apart. Well 11-24C is located in the lower part of the structure, buried 1,000 meters at the top of the Yulou, and Well 012-23C is located in the higher part of the structure, buried 980 meters at the top of the Yulou.

[0090] Since 1991, the daily oil production of Well 11-24C in the lower part of the structure has decreased, the daily liquid production has increased significantly, and the water content has exceeded 90%, which is a typical feature of edge water invasion. With the continued production of the oil well and the continuous advancement of edge water, the daily oil production of Well 012-23C in the higher part of the structure has decreased since 1998, and the daily liquid production and water content have increased significantly, which is a typical feature of edge water invasion. Figure 5 As shown in the figure, it is the production curve of well 11-24C in the low part of the structure. Figure 6 Shown is the production curve of well 012-23C2 at the high part of the structure.

[0091] Step S05, formation pressure analysis:

[0092] At the beginning of development, the original formation pressure of the Yulou oil layer in this block was 9.7Mpa. As the mining time increases, the pressure is constantly changing. According to the collected data, the formation pressure in the low part of the edge structure is greater than 4Mpa, and the formation pressure drop is relatively small. The formation pressure gradually decreases toward the high part of the structure. The formation pressure in the high part of the structure in the main area is only 1-2Mpa, and the formation pressure drop is large. The formation pressure drop gradually increases from the low part of the structure to the high part. The reason is that after the edge water invasion occurs in the heavy oil reservoir, the energy of the reservoir is replenished. From the edge of the reservoir to the main part, from the low part of the structure to the high part of the structure, the edge water continuously replenishes the energy lost by the original formation due to fluid production. Figure 7 The figure shows a plan view of the pressure distribution in the block.

[0093] Step S06, based on the data analyzed in the above steps, identify the stratum, time and plane distribution range of edge water invasion in heavy oil reservoirs; the identification result has the advantages of comprehensiveness, low cost and effectiveness, laying a solid foundation for potential tapping, adjustment and transformation of development methods of edge water heavy oil reservoirs, and providing reference for the development of similar oil reservoirs.

[0094] After introducing the method of the exemplary embodiment of the present invention, next, refer to Figure 8 A system for identifying edge water invasion in a heavy oil reservoir according to an exemplary embodiment of the present invention is introduced.

[0095] The implementation of the identification system for edge water invasion of heavy oil reservoirs can refer to the implementation of the above method, and the repeated parts will not be repeated. The term "module" or "unit" used below can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0096] Based on the same inventive concept, the present invention also proposes a system for identifying edge water intrusion in heavy oil reservoirs, such as Figure 8 As shown, the system includes:

[0097] A data acquisition unit 810 is used to acquire reservoir development data;

[0098] A well logging analysis unit 820, configured to perform well logging response analysis based on the reservoir development data to obtain well logging response data;

[0099] An oil well production analysis unit 830 is used to analyze oil well production characteristics according to the oil reservoir development data to obtain oil well production characteristic data;

[0100] The mineralization analysis unit 840 is used to collect produced water from the oil well, perform mineralization analysis on the produced water from the oil well, and obtain the mineralization of the produced water;

[0101] The water breakthrough time analysis unit 850 is used to analyze the water breakthrough time according to the structural position of the production well and the distance between the production well and the edge water, so as to obtain the water breakthrough time of the production well;

[0102] The formation pressure analysis unit 860 is used to analyze the formation pressure change after edge water invasion occurs in the heavy oil reservoir to obtain formation pressure data;

[0103] The edge water intrusion identification unit 870 is used to identify the layer, time and plane distribution range of the edge water intrusion of the reservoir based on the logging response data, oil well production characteristic data, produced water salinity, water breakthrough time of the production well and formation pressure data.

[0104] In one embodiment, the well logging analysis unit 820 is specifically used for:

[0105] Analyze the formation water content and ion concentration value in the original oil layer according to the reservoir development data, and obtain the oil layer resistivity and the flushing zone resistivity according to the formation water content and ion concentration value;

[0106] The microelectrode resistance value is obtained according to the resistivity of the flushing zone, and the change of the natural potential is obtained according to the electromotive force generated by the diffusion of ion concentration. The changes of the oil layer resistivity, microelectrode resistance value and natural potential are sorted out to obtain the logging response data.

[0107] In one embodiment, the oil well production analysis unit 830 is specifically used for:

[0108] According to the reservoir development data, the liquid production and oil production are obtained;

[0109] According to the liquid production and oil production, the ratio of the mobility of formation water to that of heavy oil is obtained as the production characteristic data of the oil well.

[0110] In one embodiment, the mineralization analysis unit 840 is specifically used for:

[0111] Collect water samples at the first sampling time point and the second sampling time point of the oil well, and perform mineralization analysis to obtain the mineralization of produced water;

[0112] The produced water mineralization is compared to obtain a produced water mineralization change value, and the nature of the produced water is determined, wherein the nature of the produced water is formation water, steam condensate, or a mixture of the above.

[0113] In one embodiment, the water breakthrough time analysis unit 850 is specifically used for:

[0114] The advancement process of production of the production well and edge water intrusion is constructed according to the water breakthrough time of the production well, and the characteristics of edge water intrusion are obtained.

[0115] In one embodiment, the formation pressure analysis unit 860 is specifically used for:

[0116] Compare the formation pressure of production wells in the early stage of development with the formation pressure after edge water invasion to obtain the formation pressure change;

[0117] According to the formation pressure change, a corresponding relationship between the structural position and the formation pressure change is established to obtain formation pressure data.

[0118] It should be noted that, although several modules of the identification system for edge water invasion of heavy oil reservoirs are mentioned in the above detailed description, such division is only exemplary and not mandatory. In fact, according to an embodiment of the present invention, the features and functions of two or more modules described above can be embodied in one module. Conversely, the features and functions of one module described above can be further divided into multiple modules to be embodied.

[0119] Based on the above invention concept, Fig. 9 As shown, the present invention also proposes a computer device 900, including a memory 910, a processor 920, and a computer program 930 stored in the memory 910 and executable on the processor 920, wherein the processor 920 implements the aforementioned method for identifying edge water intrusion in heavy oil reservoirs when executing the computer program 930.

[0120] Based on the aforementioned inventive concept, the present invention proposes a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the aforementioned method for identifying edge water intrusion in a heavy oil reservoir is implemented.

[0121] The method and system for identifying edge water invasion of heavy oil reservoirs proposed by the present invention obtain reservoir development data; perform logging response analysis based on the reservoir development data to obtain logging response data; analyze oil well production characteristics based on the reservoir development data to obtain oil well production characteristic data; collect oil well produced water, perform salinity analysis on the oil well produced water to obtain produced water salinity; analyze water breakthrough time based on the structural position of the production well and the distance between the production well and edge water to obtain water breakthrough time of the production well; analyze formation pressure changes after edge water invasion occurs in the heavy oil reservoir to obtain formation pressure data; identify the layer, time and plane distribution range of edge water invasion of the reservoir based on logging response data, oil well production characteristic data, produced water salinity, water breakthrough time of the production well and formation pressure data, and the identification result is comprehensive, low-cost and effective, laying a solid foundation for potential tapping, adjustment and transformation of development methods of edge water heavy oil reservoirs, and providing reference for similar reservoir development.

[0122] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0123] The present invention is described with reference to flowcharts and / or block diagrams of methods and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0124] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0125] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0126] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for identifying edge water intrusion in a heavy oil reservoir, characterized in that: The method includes: Obtaining reservoir development data; Performing well logging response analysis based on the reservoir development data to obtain well logging response data; Analyze the production characteristics of the oil well according to the oil reservoir development data to obtain the production characteristic data of the oil well; Collecting produced water from the oil well, performing mineralization analysis on the produced water from the oil well, and obtaining the mineralization of the produced water; Analyze the water breakthrough time according to the structural position of the production well and the distance between the production well and the edge water to obtain the water breakthrough time of the production well; Analyze the formation pressure changes after edge water invasion in heavy oil reservoirs and obtain formation pressure data; According to the logging response data, oil well production characteristic data, produced water salinity, water breakthrough time of production wells and formation pressure data, the layer, time and plane distribution range of reservoir edge water invasion are identified; Wherein, performing logging response analysis according to the reservoir development data to obtain logging response data includes: Analyze the formation water content and ion concentration value in the original oil layer according to the reservoir development data, and obtain the oil layer resistivity and the flushing zone resistivity according to the formation water content and ion concentration value; The microelectrode resistance value is obtained according to the resistivity of the flushing zone, and the change of the natural potential is obtained according to the electromotive force generated by the diffusion of ion concentration, and the changes of the oil layer resistivity, the microelectrode resistance value and the natural potential are sorted out to obtain the logging response data; The oil well production characteristics are analyzed according to the oil reservoir development data to obtain the oil well production characteristic data, including: According to the reservoir development data, the liquid production and oil production are obtained; According to the liquid production and oil production, the ratio of formation water to heavy oil mobility is obtained as oil well production characteristic data; The produced water from the oil well is collected, and the produced water is analyzed for mineralization to obtain the produced water mineralization, including: Collect water samples at the first sampling time point and the second sampling time point of the oil well, and perform mineralization analysis to obtain the mineralization of produced water; Comparing the mineralization of the produced water to obtain a change value of the mineralization of the produced water, and judging the nature of the produced water, wherein the nature of the produced water is formation water, steam condensate water, or a mixture of the formation water and steam condensate water; Among them, the water breakthrough time is analyzed according to the structural position of the production well and the distance between the production well and the edge water, and the water breakthrough time of the production well is obtained, including: According to the water breakthrough time of the production well, the production and edge water invasion progress of the production well is constructed to obtain the characteristics of edge water invasion; the water breakthrough time is shown as a process of advancing from the low part of the structure to the high part; Among them, the formation pressure changes are analyzed after edge water invasion occurs in heavy oil reservoirs, and the formation pressure data are obtained, including: Compare the formation pressure of production wells in the early stage of development with the formation pressure after edge water invasion to obtain the formation pressure change; According to the formation pressure change, a corresponding relationship between the structural position and the formation pressure change is established to obtain the formation pressure data; after the edge water invasion occurs in the heavy oil reservoir, the edge water continuously replenishes the pressure lost by the original formation due to fluid production from the edge of the reservoir to the main part, and the formation pressure drop gradually increases from the low part to the high part of the structure.

2. A system for identifying edge water intrusion in heavy oil reservoirs, characterized in that: The system includes: A data acquisition unit, used for acquiring reservoir development data; A well logging analysis unit, used for performing well logging response analysis based on the reservoir development data to obtain well logging response data; An oil well production analysis unit, used for analyzing oil well production characteristics according to the oil reservoir development data to obtain oil well production characteristic data; A mineralization analysis unit is used to collect produced water from the oil well, perform mineralization analysis on the produced water from the oil well, and obtain the mineralization of the produced water; The water breakthrough time analysis unit is used to analyze the water breakthrough time according to the structural position of the production well and the distance between the production well and the edge water, and obtain the water breakthrough time of the production well; The formation pressure analysis unit is used to analyze the formation pressure changes after edge water invasion occurs in heavy oil reservoirs and obtain formation pressure data; The edge water invasion identification unit is used to identify the layer, time and plane distribution range of the edge water invasion of the reservoir based on the logging response data, oil well production characteristic data, produced water salinity, water breakthrough time of the production well and formation pressure data; Wherein, the well logging analysis unit is specifically used for: Analyze the formation water content and ion concentration value in the original oil layer according to the reservoir development data, and obtain the oil layer resistivity and the flushing zone resistivity according to the formation water content and ion concentration value; The microelectrode resistance value is obtained according to the resistivity of the flushing zone, and the change of the natural potential is obtained according to the electromotive force generated by the diffusion of ion concentration, and the changes of the oil layer resistivity, the microelectrode resistance value and the natural potential are sorted out to obtain the logging response data; Wherein, the oil well production analysis unit is specifically used for: According to the reservoir development data, the liquid production and oil production are obtained; According to the liquid production and oil production, the ratio of formation water to heavy oil mobility is obtained as oil well production characteristic data; Wherein, the mineralization analysis unit is specifically used for: Collect water samples at the first sampling time point and the second sampling time point of the oil well, and perform mineralization analysis to obtain the mineralization of produced water; Comparing the mineralization of the produced water to obtain a change value of the mineralization of the produced water, and judging the nature of the produced water, wherein the nature of the produced water is formation water, steam condensate water, or a mixture of the formation water and steam condensate water; Wherein, the water breakthrough time analysis unit is specifically used for: According to the water breakthrough time of the production well, the production and edge water invasion progress of the production well is constructed to obtain the characteristics of edge water invasion; the water breakthrough time is shown as a process of advancing from the low part of the structure to the high part; Wherein, the formation pressure analysis unit is specifically used for: Compare the formation pressure of production wells in the early stage of development with the formation pressure after edge water invasion to obtain the formation pressure change; According to the formation pressure change, a corresponding relationship between the structural position and the formation pressure change is established to obtain the formation pressure data; after the edge water invasion occurs in the heavy oil reservoir, the edge water continuously replenishes the pressure lost by the original formation due to fluid production from the edge of the reservoir to the main part, and the formation pressure drop gradually increases from the low part to the high part of the structure.

3. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method of claim 1 is implemented.

4. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method of claim 1 is implemented.

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