CN111236934B - Method and device for determining flooding level - Google Patents
Method and device for determining flooding level Download PDFInfo
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Abstract
The application provides a method and a device for determining a flooding level, wherein the method comprises the following steps: acquiring a conventional logging curve of a target layer position of a target encryption well, a nuclear magnetic resonance spectrum T2 spectrum and a target flooding level determination model, wherein the target flooding level determination model comprises the following steps: the corresponding relation between the residual oil index and the flooding level of the target horizon of the target block where the target encryption well is located; calculating the residual oil index of the target horizon of the target encryption well based on the conventional logging curve and the nuclear magnetic resonance spectrum T2 spectrum; and determining a model according to the residual oil index of the target position of the target encryption well and the target flooding level, and determining the flooding level of the target position of the target encryption well. The method can effectively improve the determination precision of the flooding level of the target horizon, and lays an important foundation for further improving the oil field recovery efficiency.
Description
Technical Field
The application relates to the technical field of nuclear magnetic resonance logging reservoir evaluation, in particular to a method and a device for determining a flooding level.
Background
In recent years, most developed oil fields generally enter a double-high development stage with high water content and high extraction degree, but a large amount of residual oil still exists underground, so that well patterns of many oil fields are encrypted for better performing residual oil excavation, and accurate evaluation of the flooding level of an encrypted well is an important basis for further improving the oil field recovery efficiency.
At present, evaluation methods of a water flooded layer are mainly divided into two types: the evaluation method is based on the comparison of a new well and an old well for evaluating a flooded layer by an electric method, and the evaluation method is based on various new well logging technologies for evaluating the flooded layer. After reservoir flooding development, the resistivity of the reservoir is changed mainly by two changes, namely, the oil saturation changes after flooding, and the oil saturation is reduced after most reservoirs are flooded; and secondly, the property of the formation water is changed, because the property of the injected water is difficult to keep stable all the time, the water with different mineralization degrees is injected into the formation, so that the mineralization degree of the mixed solution of the formation water is difficult to determine.
In oil and gas recovery technology, new methods for resistivity analysis of water flooding experiments and resistivity calculation of mixed liquid, which are made by Zhang Heng, in 2018, in 1 month, a dynamic mixed conducting model of a water flooded layer is provided through different water flooding experiments, so that the solution of the mixed liquid of stratum water in the water flooding process is realized. Compared with a parallel conductive model and a variable-multiple substance balancing method, the method is closer to the actual stratum water flooding rule, but still requires injected water with the mineralization degree of 10000mg/L, and requires the property of the injected water to be kept unchanged in the water flooding process. However, in the actual development process, the mineralization degree of the injected water is not a definite numerical value, some well zones have complex injection conditions that clean water is injected in the early stage and produced water is reinjected or the clean water and the produced water are mixed and injected in the later stage, and the evaluation accuracy of the flooded layer is low due to the fact that an equation of a fixed injection condition is different from the actual condition.
In the 'logging technology' of 2004, showa works on the research and application of 'method for evaluating a water flooded layer by nuclear magnetic resonance logging', it is mentioned that the water signal diffusion upper limit of a T2 spectrum is determined by a water layer by using an enhanced diffusion shift spectrum method of different echo intervals, the residual oil saturation of the water flooded layer is obtained by integrating T2 spectrums of nuclear magnetic logging, and the identification of the water flooded layer is realized in a research work area. However, this method requires that a water layer must be present in the target zone, and the nuclear magnetic resonance calculated oil saturation is actually the flushing zone oil saturation, which is lower than the actual reservoir oil saturation, resulting in low accuracy of evaluation of the flooded layer.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the application provides a method and a device for determining a flooding level, and aims to solve the problem that in the prior art, the evaluation accuracy of a flooding layer is low.
The embodiment of the application provides a method for determining a flooding level, which comprises the following steps: acquiring a conventional logging curve of a target layer position of a target encryption well, a nuclear magnetic resonance spectrum T2 spectrum and a target flooding level determination model, wherein the target flooding level determination model comprises the following steps: the corresponding relation between the residual oil index and the flooding level of the target horizon of the target block where the target encryption well is located; calculating the residual oil index of the target horizon of the target encryption well based on the conventional logging curve and the nuclear magnetic resonance spectrum T2 spectrum; and determining a model according to the residual oil index of the target position of the target encryption well and the target flooding level, and determining the flooding level of the target position of the target encryption well.
In one embodiment, the target flooding level determination model is established by: acquiring a conventional logging curve of a target layer position of a reference encryption well in a target block, a nuclear magnetic resonance shift spectrum T2 spectrum and core data, wherein the core data comprises water washing degree data of the target layer position of the reference encryption well; determining the residual oil index of the target horizon of the target encryption well by using a conventional logging curve and a nuclear magnetic resonance spectrum T2 spectrum of the target horizon of the reference encryption well; and establishing a target flooding level determination model according to the residual oil index and the rock core data of the target horizon of the reference encrypted well.
In one embodiment, calculating a residual oil index of a target horizon of a target infill well from a conventional log and a nuclear magnetic resonance spectroscopy T2 spectrum comprises: judging whether a water layer exists in a target layer of the target encryption well or not based on the conventional logging curve; under the condition that a water layer exists in the target layer position of the target encryption well, determining the water signal diffusion upper limit of the target layer position of the target encryption well by utilizing a nuclear magnetic resonance spectrum T2 spectrum; and calculating the residual oil index of the target horizon of the target encrypted well according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum.
In one embodiment, after determining whether a water layer is present in the target horizon according to the conventional well log, the method further comprises: under the condition that the water layer does not exist in the target layer of the target encryption well, determining the water signal diffusion upper limit of the target layer of the target encryption well by performing a rock core nuclear magnetic resonance spectrum shift experiment on the target layer of the target encryption well; and calculating the residual oil index of the target horizon of the target encrypted well according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum.
In one embodiment, determining the upper limit of water signal diffusion of the target horizon of the target infill well by performing a core nuclear magnetic resonance spectroscopy experiment on the target horizon of the target infill well comprises: taking a core in a target layer of a target encryption well; performing a nuclear magnetic resonance spectrum shift experiment on the rock core to obtain a nuclear magnetic resonance spectrum T2 spectrum of the rock core under a saturated water state and a nuclear magnetic resonance spectrum T2 spectrum of the rock core under a saturated oil state; and determining the water signal diffusion upper limit of the target horizon of the target encryption well according to the nuclear magnetic resonance shift spectrum T2 spectrum in the saturated water state and the nuclear magnetic resonance shift spectrum T2 spectrum in the saturated oil state.
In one embodiment, calculating the residual oil index of the target horizon of the target infill well according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum comprises calculating the residual oil index of the target horizon of the target infill well according to the following formula:
wherein S isoIFor encrypting wells for the purposeThe residual oil index of the target horizon, m is the total number of points in a nuclear magnetic resonance shift spectrum T2 spectrum, n is the number of points corresponding to the upper limit of water signal diffusion, T2iFor each point corresponding T2 spectral amplitude.
In one embodiment, the signal acquisition condition corresponding to the spectrum of the nuclear magnetic resonance shift spectrum T2 satisfies at least one of the following conditions: the measurement waiting time is greater than or equal to 12s, the long echo interval is greater than or equal to 3.6ms, the short echo interval is less than or equal to 0.9ms, and the constant gradient magnetic field of the measuring instrument is greater than 10 Gs/cm.
An embodiment of the present application further provides a device for determining a flooding level, including: the acquiring module is used for acquiring a conventional logging curve of a target layer of the target encryption well, a nuclear magnetic resonance spectrum T2 spectrum and a target flooding level determining model, wherein the target flooding level determining model comprises: the corresponding relation between the residual oil index and the flooding level of the target horizon of the target block where the target encryption well is located; the calculation module is used for calculating the residual oil index of the target layer position of the target encryption well based on the conventional logging curve and the nuclear magnetic resonance spectrum T2 spectrum; and the determining module is used for determining a model according to the residual oil index of the target position of the target encryption well and the target flooding level, and determining the flooding level of the target position of the target encryption well.
An embodiment of the present application further provides a computer device, which includes a processor and a memory for storing processor-executable instructions, where the processor executes the instructions to implement the steps of the flooding level determination method in any of the above embodiments.
Embodiments of the present application also provide a computer-readable storage medium, on which computer instructions are stored, and when executed, the instructions implement the steps of the flooding level determination method described in any of the above embodiments.
In the embodiment of the application, a pre-established target flooding level determination model may be obtained, where the model includes a correspondence between a residual oil index of a target horizon of a target block where a target encryption well is located and a flooding level, the residual oil index of the target horizon of the target encryption well may be calculated based on a conventional logging curve and a nuclear magnetic resonance spectrum T2 spectrum, and then the flooding level of the target horizon of the target encryption well may be determined according to the residual oil index of the target horizon of the target encryption well and the target flooding level determination model. The method can obtain the flooding level of the target position of the target encryption well based on the nuclear magnetic resonance spectrum shift T2 spectrum, the conventional logging curve and the target flooding level determination model, and the pre-established target flooding level determination model is a model established based on actual measurement data, is not influenced by the injected water property and the injection history, and has high accuracy, so that the method can effectively improve the determination accuracy of the flooding level of the target position, and lays an important foundation for further improving the oil field recovery efficiency. In addition, the method is simple to apply, and when the evaluation of the water flooded layer is carried out, after the water flooded level determination model of the target layer of the target block is obtained, the water flooded layer evaluation can be realized in other wells only by nuclear magnetic resonance spectrum shifting logging. Moreover, the method has strong applicability, and can be used for water flooding level evaluation in ultra-low permeability reservoirs, mixed wetting reservoirs and hydrophilic reservoirs. By means of the scheme, the technical problem that the existing flooded layer is low in evaluation accuracy is solved, and the technical effect of effectively improving the evaluation accuracy of the flooded layer is achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this application, and are not intended to limit the application. In the drawings:
fig. 1 shows a flow chart of a flooding level determination method in an embodiment of the present application;
fig. 2 is a graph illustrating a nuclear magnetic resonance shift spectrum experiment result in a core saturated water state obtained through a core nuclear magnetic resonance shift spectrum experiment in an embodiment of the present application;
fig. 3 is a graph illustrating a nuclear magnetic resonance shift spectrum experiment result in a core saturated oil state obtained through a core nuclear magnetic resonance shift spectrum experiment in an embodiment of the present application;
FIG. 4 shows a schematic representation of a section of a description of the xx well waterflood core of an ultra-low permeability reservoir in an embodiment of the present application;
FIG. 5 shows a schematic representation of evaluation results of xx well flooding levels of a research area ultra-low permeability reservoir in an embodiment of the present application;
fig. 6 shows a schematic diagram of a flooding level determining apparatus in an embodiment of the present application;
fig. 7 shows a schematic diagram of a computer device in an embodiment of the application.
Detailed Description
The principles and spirit of the present application will be described with reference to a number of exemplary embodiments. It should be understood that these embodiments are given solely for the purpose of enabling those skilled in the art to better understand and to practice the present application, and are not intended to limit the scope of the present application in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As will be appreciated by one skilled in the art, embodiments of the present application may be embodied as a system, apparatus, device, method or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
The embodiment of the application provides a method and a device for determining a flooding level. Fig. 1 shows a flow chart of a flooding level determination method in an embodiment of the present application. Although the present application provides method operational steps or apparatus configurations as illustrated in the following examples or figures, more or fewer operational steps or modular units may be included in the methods or apparatus based on conventional or non-inventive efforts. In the case of steps or structures which do not logically have the necessary cause and effect relationship, the execution sequence of the steps or the module structure of the apparatus is not limited to the execution sequence or the module structure described in the embodiments and shown in the drawings of the present application. When the described method or module structure is applied in an actual device or end product, the method or module structure according to the embodiments or shown in the drawings can be executed sequentially or executed in parallel (for example, in a parallel processor or multi-thread processing environment, or even in a distributed processing environment).
Specifically, as shown in fig. 1, a method for determining a flooding level provided by an embodiment of the present application may include the following steps:
and S101, obtaining a conventional logging curve, a nuclear magnetic resonance shift spectrum T2 spectrum and a target flooding level determination model of a target horizon of a target encryption well.
The encryption well is obtained by re-encrypting the well pattern on the basis of the original well pattern according to the condition of the underground residual oil area or the dead oil area, so that oil in the residual oil area or the dead oil area is produced as much as possible. The target encrypted well is the encrypted well to be studied and may be any encrypted well in the block to be studied. Horizons, i.e., stratigraphic horizons, refer to a particular location in the stratigraphic sequence. The target horizon is a horizon to be researched and can be any horizon in an encrypted well to be researched. That is, the target horizon for the target infill may be a horizon in the infill well under study for which a flooding level is to be determined.
The conventional well log may include at least one of: resistivity logging curve, well diameter curve, natural potential curve, natural gamma curve, sound wave time difference curve and the like. For example, the target infill may be logged by a conventional logging method to obtain a conventional log of the target horizon of the target infill. Conventional logging methods may include at least one of the following logging methods: electrical, radioactive, and sonic logging methods, among others. A natural gamma curve, a natural potential curve, a well diameter curve, a resistivity logging curve, a sound wave time difference curve and a porosity curve can be obtained by a conventional logging method, and a formation dip angle and a natural gamma energy spectrum can also be obtained under the condition of complex formation. The obtained conventional well logging curve can be stored in a server, and the conventional well logging curve of the target horizon of the template encrypted well can be obtained from the server.
Wherein the nuclear magnetic resonance shift spectrum T2 spectrum is a nuclear magnetic resonance shift spectrum transverse relaxation time spectrum. The nuclear magnetic resonance spectrum T2 spectrum of the target horizon of the target encrypted well can be obtained by performing a nuclear magnetic resonance spectrum shift experiment on the target encrypted well. The obtained nuclear magnetic resonance spectrum T2 spectrum can be stored in a server, and a nuclear magnetic resonance spectrum T2 spectrum of the target horizon of the target encrypted well can be obtained from the server.
The target flooding level determination model may include: and the corresponding relation between the residual oil index and the flooding level of the target horizon of the target block where the target encryption well is located. The target flooding level determination model is suitable for evaluating a flooding layer of a target layer of any encrypted well positioned in a target block. The target flooding level determination model can be established in advance according to actual measurement data, and can accurately and conveniently reflect the corresponding relation between the flooding level and the residual oil index. The pre-established target flooding level determination model may be stored in a server, and the target flooding level determination module may be acquired from the server.
And S102, calculating the residual oil index of the target layer position of the target encryption well based on the conventional logging curve and the nuclear magnetic resonance spectrum T2 spectrum.
Specifically, after obtaining the conventional log and the nmr shift spectrum T2 spectrum of the target horizon of the target infill well, the remaining oil index of the target horizon of the target infill well may be calculated based on the conventional log and the nmr shift spectrum T2 spectrum. Wherein the residual oil index is a parameter for characterizing the amount of oil remaining in the target horizon of the target infill well. The higher the remaining oil index, indicating more remaining oil in the reservoir, the lower the water cut in the reservoir and the lower the degree of flooding. The lower the remaining oil index, indicating less remaining oil in the reservoir, the higher the water cut in the reservoir and the higher the degree of flooding.
And S103, determining a model according to the residual oil index of the target position of the target encryption well and the target flooding level, and determining the flooding level of the target position of the target encryption well.
Wherein, the flooding level is the flooding degree of the flooding layer. The water flooded layer is a reservoir formed by a series of changes of physical properties and electrical properties of a reservoir layer due to flooding oil or edge and bottom water propulsion and different degrees of water flooding of an oil layer. For example, the flooding levels may include: no flooding, low flooding, medium flooding and high flooding. For another example, the flooding levels may include: primary flooding, secondary flooding, tertiary flooding and quaternary flooding. And the water content corresponding to the first-stage flooding is greater than that corresponding to the second-stage flooding, the water content corresponding to the second-stage flooding is greater than that corresponding to the third-stage flooding, and the water content corresponding to the third-stage flooding is greater than that corresponding to the fourth-stage flooding. Because the target flooding level determination model comprises the corresponding relation between the residual oil index and the flooding level, after the residual oil index of the target position of the target encryption well is obtained, the flooding level of the target position of the target encryption well can be determined according to the residual oil index and the target flooding level determination model obtained through calculation.
The method in the embodiment can obtain the flooding level of the target position of the target encryption well based on the nuclear magnetic resonance spectrum shift T2 spectrum, the conventional logging curve and the target flooding level determination model, and the pre-established target flooding level determination model is a model established based on actual measurement data, is not influenced by injection water properties and injection history, and is high in accuracy, so that the method can effectively improve the determination accuracy of the flooding level of the target position, and lays an important foundation for further improving the oil field recovery efficiency. In addition, the method is simple to apply, and when the evaluation of the water flooded layer is carried out, after the water flooded level determination model of the target layer of the target block is obtained, the water flooded layer evaluation can be realized in other wells only by nuclear magnetic resonance spectrum shifting logging. Moreover, the method has strong applicability, and can be used for water flooding level evaluation in ultra-low permeability reservoirs, mixed wetting reservoirs and hydrophilic reservoirs.
In some embodiments of the present application, the target flooding level determination model may be established by: acquiring a conventional logging curve of a target layer position of a reference encryption well in a target block, a nuclear magnetic resonance shift spectrum T2 spectrum and core data, wherein the core data comprises water washing degree data of the target layer position of the reference encryption well; determining the residual oil index of the target horizon of the target encryption well by using a conventional logging curve and a nuclear magnetic resonance spectrum T2 spectrum of the target horizon of the reference encryption well; and establishing a target flooding level determination model according to the residual oil index and the rock core data of the target horizon of the reference encrypted well.
Wherein the reference encrypted well may be another encrypted well located within the target block than the target encrypted well. A conventional log and a nmr shift spectrum T2 spectrum of the target horizon of the reference encrypted well within the target block may be obtained using a similar method as described above for obtaining a conventional log of the target horizon of the target encrypted well.
The core is a cylindrical rock sample taken out of a hole by using an annular core drill or other coring tools according to the requirements of geological exploration work or engineering. The core data may include various data related to the core. In this embodiment, the core data may include water washing level data of a target horizon of the reference infill, for example, the water washing levels of a plurality of depth sections of the target horizon may be included. Wherein, the washing degree refers to the degree that the rock core is displaced by injected water in the oil field water injection development process, can generally be divided into three grades: strong water washing, medium water washing and weak water washing. In the development process of the oil field, the water flooding development effect of the water flooding development oil field can be preliminarily evaluated by analyzing the water washing characteristics, the water washing degree and the influence factors of various oil layers. The degree of washing may also be referred to as a flooding degree or a flooding level.
The residual oil index of the target horizon of the target infill well may be determined using a conventional log and a nuclear magnetic resonance shift spectrum T2 spectrum of the target horizon of the reference infill well. Then, according to the residual oil index of the target position of the reference encryption well and the water washing degree data of the target position of the reference encryption well, the corresponding relation between the residual oil index and the water flooding level (namely, the water washing degree data) can be determined, namely, a target water flooding level determination model is established.
Through the method, a flooding level determination model of the target layer of the target block can be established, and the model is suitable for evaluating the flooding level of the target layer of the target encryption well in the target block. The target flooding level determination model is established according to the residual oil index and the core data of the reference encryption well of the target block, so that the corresponding relation between the flooding level of the target layer of the target block and the residual oil index can be accurately represented, the influence of the injected water property and the injection history can be avoided, and the flooding level of the target layer of the target encryption well can be accurately determined based on the target flooding level determination model.
In some embodiments of the present application, calculating the remaining oil index of the target horizon of the target infill well based on the conventional log and the nuclear magnetic resonance spectroscopy T2 spectrum may include: judging whether a water layer exists in a target layer of the target encryption well or not based on the conventional logging curve; under the condition that a water layer exists in the target layer position of the target encryption well, determining the water signal diffusion upper limit of the target layer position of the target encryption well by utilizing a nuclear magnetic resonance spectrum T2 spectrum; and calculating the residual oil index of the target horizon of the target encrypted well according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum.
Specifically, whether a water layer exists in the target horizon of the target infill well can be judged based on the conventional well log. Under the condition that the water layer exists in the target layer position of the target encryption well, the nuclear magnetic resonance shift spectrum T2 spectrum of the target layer position of the target encryption well can be directly utilized to determine the water signal diffusion upper limit of the target layer position of the target encryption well. In particular, the water layer in the target horizon of the target infill may be spaced at a long echo interval TELThe upper limit of the lower T2 signal is determined as the upper limit of diffusion T of the water signal2DW. After the water signal diffusion upper limit of the target position of the target encryption well is obtained, the residual oil index of the target position of the target encryption well can be calculated according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum. By the method, whether a water layer exists in the target horizon or not can be determined according to a conventional logging curve, and under the condition that the water layer exists, the nuclear magnetic resonance shift spectrum T2 spectrum is directly used for determining the water signal diffusion upper limit, so that the residual oil index is calculated.
In some embodiments of the present application, after determining whether a water layer is present in the target horizon according to the conventional well log, the method may further include: under the condition that the water layer does not exist in the target layer of the target encryption well, determining the water signal diffusion upper limit of the target layer of the target encryption well by performing a rock core nuclear magnetic resonance spectrum shift experiment on the target layer of the target encryption well; and calculating the residual oil index of the target horizon of the target encrypted well according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum.
Specifically, when it is determined that the water layer does not exist in the target layer of the target encrypted well, the water signal diffusion upper limit cannot be directly determined according to the nuclear magnetic resonance shift spectrum T2 spectrum of the target layer of the target encrypted well. In this case, the upper limit of water signal diffusion of the target horizon of the target infill may be determined by performing a core nmr shift spectrum experiment on the target horizon of the target infill. And then, calculating the residual oil index of the target horizon of the target encrypted well according to the water diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum. Through the mode, under the condition that the water layer does not exist in the target layer of the target encryption well, the water signal diffusion upper limit can be determined through carrying out a rock core nuclear magnetic resonance spectrum shift experiment on the target layer, so that the residual oil index is determined, and the residual oil index of the target layer can be determined under the condition that the water layer does not exist in the target layer.
Further, in some embodiments of the present application, determining the upper limit of water signal diffusion of the target horizon of the target infill well by performing a core nmr shift spectrum experiment on the target horizon of the target infill well may include: taking a core in a target layer of a target encryption well; performing a nuclear magnetic resonance spectrum shift experiment on the rock core to obtain a nuclear magnetic resonance spectrum T2 spectrum of the rock core under a saturated water state and a nuclear magnetic resonance spectrum T2 spectrum of the rock core under a saturated oil state; and determining the water signal diffusion upper limit of the target horizon of the target encryption well according to the nuclear magnetic resonance shift spectrum T2 spectrum in the saturated water state and the nuclear magnetic resonance shift spectrum T2 spectrum in the saturated oil state.
Specifically, the upper diffusion limit of the water signal can be obtained by performing core nuclear magnetic shift spectroscopy on the target horizon of the target infill well. A nuclear magnetic resonance shift spectrum T2 spectrum of the rock core in a saturated water state is obtained by taking the rock core in a target layer of a target encryption well, washing oil and salt, saturating the aqueous solution of the formation with the rock core, and measuring the T2 spectrum. And then, simulating oil with the same viscosity under the formation condition prepared by crude oil, binding the water state by oil-drive water, and measuring the nuclear magnetic resonance spectrum T2 spectrum of the bound water state to obtain the nuclear magnetic resonance spectrum T2 spectrum of the rock core under the saturated oil state. Then, the upper diffusion limit of the water signal can be determined according to the nuclear magnetic resonance shift spectrum T2 spectrum of the rock core in a saturated water state and the nuclear magnetic resonance shift spectrum T2 spectrum of the rock core in a saturated oil state.
Referring to fig. 2 and 3, fig. 2 and 3 respectively show graphs of the nmr shift spectrum experiment results in a core saturated water state and a core saturated oil state obtained by the nmr shift spectrum experiment in an embodiment of the present application. Specifically, under the condition of a fixed gradient magnetic field with the intensity of 18Gs/cm, nuclear magnetic resonance shift spectrum T2 spectrums of a sample in a saturated water state and a residual oil state are respectively measured, and the measurement results are shown in FIGS. 2 and 3. The measurement conditions were: echo spacing TE0.2ms, 0.6ms, 3.6ms, and 12s latency. The measured nuclear magnetic resonance shift spectrum T2 spectrums in the saturated water state and the saturated oil state can be stored in the server, and the nuclear magnetic resonance shift spectrum T2 spectrums in the saturated water state and the saturated oil state can be obtained from the server. Then, the nuclear magnetic resonance shift spectrum T2 spectrum in the saturated water state and the nuclear magnetic resonance shift spectrum T2 spectrum in the saturated oil state are identified, and the upper limit of the water signal diffusion is 50 ms.
Specifically, as can be seen from fig. 2, the core saturated water state simulates a water layer, and the echo interval T is increasedEAt 3.6ms, the T2 spectrum is shifted forward and no signal is present after 50ms on the nmr shift spectrum T2 spectrum. As can be seen from FIG. 3, the core oil drives water to a confined water state to simulate an oil layer at an echo interval TEAt 3.6ms, the T2 spectrum is shifted forward, but after 50ms on the nmr shift spectrum T2 spectrum, there is still a small peak, which is the signal of the oil. In summary, the upper limit of the spread of the water signal in this state is 50 ms. Reservoir development bottom water of target infill well, water layer at echo interval TEThe water signal diffusion upper limit of the core experiment is verified by moving to the water signal diffusion upper limit within 3.6 ms. Through the mode, the water signal diffusion upper limit of the target layer position of the target encryption well can be determined through a rock core nuclear magnetic resonance spectrum shift experiment.
In other embodiments, in the case that it is determined that the water layer does not exist in the target layer of the target infill well, the upper limit of water signal diffusion may also be determined by the nmr log of the adjacent well with the water layer. The determination of the water signal diffusion upper limit through the nuclear magnetic resonance logging curve of the water layer in the adjacent well means that the water signal diffusion upper limit determined according to the nuclear magnetic resonance shift spectrum T2 spectrum of the target layer position of the adjacent encrypted well can be determined as the water signal diffusion upper limit of the target layer position of the target encrypted well under the condition that the water layer exists in the adjacent encrypted well according to the conventional logging curve of the target layer position of the encrypted well adjacent to the target encrypted well. That is, the upper water signal diffusion limit of the target horizon of the adjacent encrypted well in which the water layer exists may be determined as the upper water signal diffusion limit of the target horizon of the target encrypted well. By the aid of the method, the water signal diffusion upper limit of the target layer position of the target encryption well can be conveniently and quickly determined, and further the residual oil index of the target layer position of the target encryption well is determined.
In some embodiments of the present application, calculating the residual oil index of the target horizon of the target infill well according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum includes calculating the residual oil index of the target horizon of the target infill well according to the following formula:
wherein S isoIThe residual oil index of a target horizon of a target encryption well is shown, m is the total point number in a nuclear magnetic resonance shift spectrum T2 spectrum, n is the point number corresponding to the upper limit of water signal diffusion, T2iFor each point corresponding T2 spectral amplitude. The total points in the nuclear magnetic resonance shift spectrum T2 spectrum refer to the total sampling points. The number of points corresponding to the upper limit of the water signal diffusion is the serial number of the corresponding sampling point of the upper limit of the water signal diffusion in the spectrum of the nuclear magnetic resonance shift spectrum T2. Through the method, the residual oil index of the target horizon of the target encryption well can be determined according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum.
In some embodiments of the present application, the signal acquisition condition corresponding to the T2 spectrum satisfies at least one of the following conditions: the measurement waiting time is greater than or equal to 12s, the long echo interval is greater than or equal to 3.6ms, the short echo interval is less than or equal to 0.9ms, and the constant gradient magnetic field of the measuring instrument is greater than 10 Gs/cm.
Specifically, in order to make the shift spectrum of the target layer of the target encryption well obvious, when the T2 signal is acquired, the signal acquisition condition may be set to satisfy at least one of the following conditions: the measurement waiting time is greater than or equal to 12s, the long echo interval is greater than or equal to 3.6ms, the short echo interval is less than or equal to 0.9ms, and the constant gradient magnetic field of the measuring instrument is greater than 10 Gs/cm.
The above method is described below with reference to a specific example, however, it should be noted that the specific example is only for better describing the present application and is not to be construed as limiting the present application.
In this particular embodiment, the flooding level determination method may include the following steps.
And 2, determining the upper diffusion limit of the water signal according to the conventional logging data and the nuclear magnetic resonance shift spectrum T2 spectral logging data. Specifically, the presence of a water layer is determined based on conventional well log data. If the water layer is judged to exist, the water layer is positioned at the long echo interval TELThe lower T2 signal upper limit is defined as the water signal upper limit of diffusion T2DW. Under the condition that the target horizon is judged to be free of the water layer, the diffusion upper limit T of the obtained water signal can be determined through a nuclear magnetic resonance logging curve of the adjacent well with the water layer or a rock core nuclear magnetic resonance shift spectrum experiment2DW. Specifically, determining the upper diffusion limit T of the water signal through a rock core nuclear magnetic resonance spectrum shift experiment2DWThe method includes the steps that a plunger sample core is required to be taken at a target layer, after oil washing and salt washing, the core saturates a stratum water solution and measures a nuclear magnetic resonance shift spectrum T2 spectrum, then oil and oil drive water binding water state is simulated by crude oil with the same viscosity under the stratum condition, and a nuclear magnetic resonance shift spectrum T2 spectrum of the bound water state is measured. A nuclear magnetic resonance shift spectrum T2 spectrum of the core in a saturated water state (e.g., as shown in fig. 2) and a nuclear magnetic resonance shift spectrum T2 spectrum of the core in a saturated oil state (e.g., as shown in fig. 3) can be obtained. Determining the upper diffusion limit T of the water signal through a nuclear magnetic resonance shift spectrum T2 spectrum under two states2DW. Wherein, the diffusion upper limit T of the water signal is obtained through a rock core nuclear magnetic resonance spectrum shift experiment2DWIn the time, the constant gradient magnetic field of the measuring instrument needs to be larger than 10Gs/cm (the larger the constant gradient magnetic field is, the more obvious the shift spectrum is), and other measuring parameters are consistent with the underground nuclear magnetic logging.
And 3, calculating the residual oil index by utilizing a nuclear magnetic resonance shift spectrum T2 spectrum logging curve and the water signal diffusion upper limit. After the upper limit of water signal diffusion in the region of interest is determined in the above step, it can be formulated according to the formula
The residual oil index can be calculated, wherein m is the total point of the nuclear magnetic resonance shift spectrum T2 spectrumThe number n is the point number corresponding to the upper limit of water signal diffusion, T2iFor each point corresponding T2 spectral amplitude. Referring to fig. 5, a schematic diagram of evaluation results of xx well flooding levels of a research area ultra-low permeability reservoir in an embodiment of the application is shown. The remaining oil index calculations for the study interval are shown in the second right to left column of fig. 5.
And 4, scaling different residual oil indexes into different flooding levels by using coring description data, so as to realize the quantitative evaluation of the flooding levels based on the nuclear magnetic resonance shift spectrum. In a research area xx well, the water washing degree of the closed coring of the encryption well is described according to the judgment standard of SY/T5366-2000 technical requirements of coring data of oil and gas development wells, as shown in Table 1.
TABLE 1
Referring to fig. 4, a core description section of xx well waterflood of an ultra-low permeability reservoir in a study area is shown. Combining the core description profile with the residual oil index obtained based on the nuclear magnetic resonance shift spectrum T2 spectrum, the flooding level evaluation criterion (i.e. flooding level determination model) can be determined, as shown in Table 2.
TABLE 2
| Water flooded grade | Low (un) water logging | Well water logging | High water logging |
| Index of remaining oil | >0.15 | 0.1～0.15 | <0.1 |
And 5, for the encrypted wells which are in the same zone and are only used for measuring nuclear magnetic shift spectrum logging, determining the water flooding level of the encrypted wells which are in the same zone and are only used for measuring nuclear magnetic shift spectrum logging by calculating the residual oil index of the encrypted wells and utilizing the residual oil index and the water flooding level evaluation standard established in the step 4. The method is used for detecting 4 inspection wells, and the coincidence rate condition is good.
The method in the embodiment can establish the flooding level determination model based on the conventional logging curve, the nuclear magnetic resonance shift spectrum T2 spectrum and the rock core description data, and the model is not influenced by the injected water property and the injection history, so that the accuracy of the evaluation of the flooding layer can be effectively improved, and an important foundation is laid for further improving the oil field recovery efficiency. The method is simple to apply, when the flooded layer is evaluated, only the water signal diffusion upper limit of the block is determined, the flooded layer evaluation standard is determined by combining the data described by the rock core, and the flooded layer evaluation can be realized in other wells only by nuclear magnetic resonance spectroscopy logging. In addition, the method has strong applicability, and can be used for water flooding level evaluation in ultra-low permeability reservoirs, mixed wetting reservoirs and hydrophilic reservoirs.
Based on the same inventive concept, the embodiment of the present application further provides a water flooding level determining apparatus, as described in the following embodiments. Because the principle of the device for determining the flooding level to solve the problem is similar to the method for determining the flooding level, the implementation of the device for determining the flooding level can refer to the implementation of the method for determining the flooding level, and repeated parts are not described again. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated. Fig. 6 is a block diagram of a structure of a flooding level determining apparatus according to an embodiment of the present application, as shown in fig. 6, including: an acquisition module 601, a calculation module 602, and a determination module 603, which are described below.
The obtaining module 601 is configured to obtain a conventional logging curve of a target horizon of a target encryption well, a nuclear magnetic resonance spectrum T2 spectrum, and a target flooding level determination model, where the target flooding level determination model includes: and the corresponding relation between the residual oil index and the flooding level of the target horizon of the target block where the target encryption well is located.
The calculation module 602 is configured to calculate a residual oil index of a target horizon of a target infill well based on a conventional log and a nuclear magnetic resonance spectroscopy T2 spectrum.
The determining module 603 is configured to determine a model according to the remaining oil index of the target layer of the target encryption well and the target flooding level, and determine the flooding level of the target layer of the target encryption well.
In some embodiments of the present application, the target flooding level determination model may be established by: acquiring a conventional logging curve of a target layer position of a reference encryption well in a target block, a nuclear magnetic resonance shift spectrum T2 spectrum and core data, wherein the core data comprises water washing degree data of the target layer position of the reference encryption well; determining the residual oil index of the target horizon of the target encryption well by using a conventional logging curve and a nuclear magnetic resonance spectrum T2 spectrum of the target horizon of the reference encryption well; and establishing a target flooding level determination model according to the residual oil index and the rock core data of the target horizon of the reference encrypted well.
In some embodiments of the present application, the calculation module may be specifically configured to: judging whether a water layer exists in a target layer of the target encryption well or not based on the conventional logging curve; under the condition that a water layer exists in the target layer position of the target encryption well, determining the water signal diffusion upper limit of the target layer position of the target encryption well by utilizing a nuclear magnetic resonance spectrum T2 spectrum; and calculating the residual oil index of the target horizon of the target encrypted well according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum.
In some embodiments of the present application, the calculation module may be further specifically configured to: after whether a water layer exists in a target layer position is determined according to a conventional logging curve, determining the water signal diffusion upper limit of the target layer position of a target encryption well by performing a rock core nuclear magnetic resonance spectrum shift experiment on the target layer position of the target encryption well under the condition that the water layer does not exist in the target layer position of the target encryption well; and calculating the residual oil index of the target horizon of the target encrypted well according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum.
In some embodiments of the present application, determining the upper limit of water signal diffusion of the target horizon of the target infill well by performing a core nmr shift spectrum experiment on the target horizon of the target infill well may include: taking a core in a target layer of a target encryption well; performing a nuclear magnetic resonance spectrum shift experiment on the rock core to obtain a nuclear magnetic resonance spectrum T2 spectrum of the rock core under a saturated water state and a nuclear magnetic resonance spectrum T2 spectrum of the rock core under a saturated oil state; and determining the water signal diffusion upper limit of the target horizon of the target encryption well according to the nuclear magnetic resonance shift spectrum T2 spectrum in the saturated water state and the nuclear magnetic resonance shift spectrum T2 spectrum in the saturated oil state.
In some embodiments of the present application, calculating the residual oil index of the target horizon of the target infill well according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum may include calculating the residual oil index of the target horizon of the target infill well according to the following formula:
wherein S isoIThe residual oil index of a target horizon of a target encryption well is shown, m is the total point number in a nuclear magnetic resonance shift spectrum T2 spectrum, n is the point number corresponding to the upper limit of water signal diffusion, T2iFor each point corresponding T2 spectral amplitude.
In some embodiments of the present application, the signal acquisition condition corresponding to the T2 spectrum satisfies at least one of the following conditions: the measurement waiting time is greater than or equal to 12s, the long echo interval is greater than or equal to 3.6ms, the short echo interval is less than or equal to 0.9ms, and the constant gradient magnetic field of the measuring instrument is greater than 10 Gs/cm.
From the above description, it can be seen that the embodiments of the present application achieve the following technical effects: the flooding level of the target position of the target encryption well can be obtained based on a nuclear magnetic resonance shift spectrum T2 spectrum, a conventional logging curve and a target flooding level determination model, and the pre-established target flooding level determination model is a model established based on actual measurement data, is not influenced by injection water properties and injection history, is high in accuracy, can effectively improve the determination accuracy of the flooding level of the target position, and lays an important foundation for further improving the oil field recovery efficiency. In addition, the method and the device are simple to apply, and when the evaluation of the water flooded layer is carried out, after the water flooded level determination model of the target layer of the target block is obtained, the water flooded layer evaluation can be realized in other wells only by nuclear magnetic resonance spectrum-shifting logging. Moreover, the method and the device have strong applicability, and can be used for water flooding level evaluation in ultra-low permeability reservoirs, mixed wetting reservoirs and hydrophilic reservoirs.
The embodiment of the present application further provides a computer device, which may specifically refer to a schematic structural diagram of a computer device based on the flooding level determination method provided in the embodiment of the present application shown in fig. 7, where the computer device may specifically include an input device 71, a processor 72, and a memory 73. Wherein the memory 73 is configured to store processor-executable instructions. The processor 72, when executing the instructions, performs the steps of the flooding level determination method described in any of the embodiments above.
In this embodiment, the input device may be one of the main apparatuses for information exchange between a user and a computer system. The input device may include a keyboard, a mouse, a camera, a scanner, a light pen, a handwriting input board, a voice input device, etc.; the input device is used to input raw data and a program for processing the data into the computer. The input device can also acquire and receive data transmitted by other modules, units and devices. The processor may be implemented in any suitable way. For example, the processor may take the form of, for example, a microprocessor or processor and a computer-readable medium that stores computer-readable program code (e.g., software or firmware) executable by the (micro) processor, logic gates, switches, an Application Specific Integrated Circuit (ASIC), a programmable logic controller, an embedded microcontroller, and so forth. The memory may in particular be a memory device used in modern information technology for storing information. The memory may include multiple levels, and in a digital system, the memory may be any memory as long as it can store binary data; in an integrated circuit, a circuit without a physical form and with a storage function is also called a memory, such as a RAM, a FIFO and the like; in the system, the storage device in physical form is also called a memory, such as a memory bank, a TF card and the like.
In this embodiment, the functions and effects of the specific implementation of the computer device can be explained in comparison with other embodiments, and are not described herein again.
The present application further provides a computer storage medium based on the flooding level determination method, where the computer storage medium stores computer program instructions, and the computer program instructions, when executed, implement the steps of the flooding level determination method in any of the above embodiments.
In this embodiment, the storage medium includes, but is not limited to, a Random Access Memory (RAM), a Read-Only Memory (ROM), a Cache (Cache), a Hard Disk Drive (HDD), or a Memory Card (Memory Card). The memory may be used to store computer program instructions. The network communication unit may be an interface for performing network connection communication, which is set in accordance with a standard prescribed by a communication protocol.
In this embodiment, the functions and effects specifically realized by the program instructions stored in the computer storage medium can be explained by comparing with other embodiments, and are not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the embodiments of the present application described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different from that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, embodiments of the present application are not limited to any specific combination of hardware and software.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the application should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the pending claims along with the full scope of equivalents to which such claims are entitled.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and it will be apparent to those skilled in the art that various modifications and variations can be made in the embodiment of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A method for determining a flooding level, comprising:
acquiring a conventional logging curve of a target horizon of a target encryption well, a nuclear magnetic resonance spectrum T2 spectrum and a target flooding level determination model, wherein the target flooding level determination model comprises: the corresponding relation between the residual oil index and the flooding level of the target horizon of the target block where the target encryption well is located;
calculating a residual oil index of a target horizon of the target encrypted well based on the conventional logging curve and the nuclear magnetic resonance spectrum T2 spectrum;
determining a model according to the residual oil index of the target position of the target encryption well and the target flooding level, and determining the flooding level of the target position of the target encryption well;
calculating the residual oil index of the target horizon of the target encryption well according to the conventional logging curve and the nuclear magnetic resonance spectrum T2 spectrum, wherein the calculation comprises the following steps:
judging whether a water layer exists in a target layer of the target encrypted well or not based on the conventional well logging curve;
under the condition that the water layer does not exist in the target layer of the target encryption well, determining the water signal diffusion upper limit of the target layer of the target encryption well by performing a rock core nuclear magnetic resonance spectrum shift experiment on the target layer of the target encryption well;
calculating the residual oil index of the target horizon of the target encryption well according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum;
calculating the residual oil index of the target horizon of the target encryption well according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum, wherein the step of calculating the residual oil index of the target horizon of the target encryption well according to the following formula comprises the following steps:
wherein S isoIThe residual oil index of the target horizon of the target encryption well is shown, m is the total number of points in the nuclear magnetic resonance shift spectrum T2 spectrum, n is the number of points corresponding to the upper diffusion limit of the water signal, T2iFor each point corresponding T2 spectral amplitude.
2. The method of claim 1, wherein the target flooding level determination model is established by:
acquiring a conventional logging curve, a nuclear magnetic resonance shift spectrum T2 spectrum and core data of a target horizon of a reference encryption well in the target block, wherein the core data comprises water washing degree data of the target horizon of the reference encryption well;
determining the residual oil index of the target horizon of the target encryption well by using the conventional logging curve and the nuclear magnetic resonance shift spectrum T2 spectrum of the target horizon of the reference encryption well;
and establishing the target flooding level determination model according to the residual oil index of the target horizon of the reference encrypted well and the rock core data.
3. The method of claim 1, wherein calculating the residual oil index of the target horizon of the target infill well from the conventional log and the T2 nmr spectrum comprises:
judging whether a water layer exists in a target layer of the target encrypted well or not based on the conventional well logging curve;
under the condition that a water layer exists in the target layer position of the target encryption well, determining the water signal diffusion upper limit of the target layer position of the target encryption well by utilizing the nuclear magnetic resonance shift spectrum T2 spectrum;
and calculating the residual oil index of the target horizon of the target encryption well according to the water signal diffusion upper limit and the nuclear magnetic resonance shift spectrum T2 spectrum.
4. The method of claim 1, wherein determining the upper limit of water signal diffusion of the target horizon of the target infill well by performing a core nuclear magnetic resonance spectroscopy experiment on the target horizon of the target infill well comprises:
taking a core in a target horizon of the target encrypted well;
performing a nuclear magnetic resonance spectrum shift experiment on the rock core to obtain a nuclear magnetic resonance spectrum shift T2 spectrum of the rock core under a saturated water state and a nuclear magnetic resonance spectrum shift T2 spectrum of the rock core under a saturated oil state;
and determining the water signal diffusion upper limit of the target layer position of the target encryption well according to the nuclear magnetic resonance shift spectrum T2 spectrum in the saturated water state and the nuclear magnetic resonance shift spectrum T2 spectrum in the saturated oil state.
5. The method according to claim 1, wherein the signal acquisition condition corresponding to the nuclear magnetic resonance shift spectrum T2 spectrum satisfies at least one of the following conditions: the measurement waiting time is greater than or equal to 12s, the long echo interval is greater than or equal to 3.6ms, the short echo interval is less than or equal to 0.9ms, and the constant gradient magnetic field of the measuring instrument is greater than 10 Gs/cm.
6. A flooding level determining apparatus, comprising:
the acquiring module is used for acquiring a conventional logging curve of a target layer of a target encrypted well, a nuclear magnetic resonance spectrum T2 spectrum and a target flooding level determining model, wherein the target flooding level determining model comprises: the corresponding relation between the residual oil index and the flooding level of the target horizon of the target block where the target encryption well is located;
a calculation module, configured to calculate a residual oil index of a target horizon of the target infill well based on the conventional logging curve and the nuclear magnetic resonance spectrum T2 spectrum;
the determining module is used for determining a model according to the residual oil index of the target position of the target encryption well and the target flooding level, and determining the flooding level of the target position of the target encryption well;
wherein the calculation module is specifically configured to:
judging whether a water layer exists in a target layer of the target encrypted well or not based on the conventional well logging curve;
under the condition that the water layer does not exist in the target layer of the target encryption well, determining the water signal diffusion upper limit of the target layer of the target encryption well by performing a rock core nuclear magnetic resonance spectrum shift experiment on the target layer of the target encryption well;
calculating the residual oil index of the target horizon of the target encryption well according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum;
calculating the residual oil index of the target horizon of the target encryption well according to the water signal diffusion upper limit and the nuclear magnetic resonance spectrum T2 spectrum, wherein the step of calculating the residual oil index of the target horizon of the target encryption well according to the following formula comprises the following steps:
wherein S isoIThe residual oil index of the target horizon of the target encryption well is shown, m is the total number of points in the nuclear magnetic resonance shift spectrum T2 spectrum, n is the number of points corresponding to the upper diffusion limit of the water signal, T2iFor each point corresponding T2 spectral amplitude.
7. A computer device comprising a processor and a memory for storing processor-executable instructions that, when executed by the processor, implement the steps of the method of any one of claims 1 to 5.
8. A computer-readable storage medium having stored thereon computer instructions, which when executed by a processor, implement the steps of the method of any one of claims 1 to 5.
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