CN107246900B - Method and device for determining oil-water interface position - Google Patents
Method and device for determining oil-water interface position Download PDFInfo
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Abstract
The embodiment of the application discloses a method and a device for determining the position of an oil-water interface. The method comprises the following steps: acquiring pressure measurement data at a plurality of water layer pressure measurement point positions and pressure measurement data at a plurality of oil layer pressure measurement point positions in a target layer section of a region to be measured; the target layer section comprises: an oil layer and an aqueous layer; the pressure measurement data includes: actually measured pressure and depth of the stratum; determining a target hydrostatic pressure gradient according to the initial hydrostatic pressure gradient set and the pressure measurement data at the positions of the multiple water layer pressure measurement points; determining pressure measuring reference surface pressure corresponding to the target layer section according to the target hydrostatic pressure gradient and pressure measuring data at the positions of the water layer pressure measuring points; and determining the oil-water interface position of the target layer section according to the pressure measuring reference surface pressure, the target hydrostatic pressure gradient and pressure measuring data at the pressure measuring point positions of the oil layers. The accuracy of the determined oil-water interface position may be improved.
Description
Technical Field
The application relates to the technical field of petroleum exploration and development, in particular to a method and a device for determining the position of an oil-water interface.
Background
The determination of the oil-water interface position is one of the core problems of oil-gas reservoir scale estimation and reserve calculation. There are many methods for determining the oil-water interface in the prior art, and the pressure-depth method is one of the common methods.
The pressure-depth method mainly comprises the following steps: acquiring formation actual measurement pressure at different stratum depths in a target interval; wherein the target interval comprises an oil layer and a water layer; according to the stratum actual measurement pressure at different stratum depths, drawing a relation graph of the stratum depth and the stratum actual measurement pressure to obtain a stratum depth-stratum actual measurement pressure profile, and then performing straight line fitting regression on data points on the stratum depth-stratum actual measurement pressure profile to obtain an oil layer pressure gradient line and a water layer pressure gradient line.
The inventor finds that at least the following problems exist in the prior art: for a target interval with a heavy oil reservoir, the difference between the oil density and the water density is small, and the small difference may be close to the measurement precision of a pressure measurement tool, which may cause the slopes of the obtained oil layer pressure gradient line and the water layer pressure gradient line to be close, so that the position of the oil-water interface in the target interval is difficult to accurately determine.
Disclosure of Invention
An object of the embodiments of the present application is to provide a method and an apparatus for determining a position of an oil-water interface, so as to improve accuracy of the determined position of the oil-water interface.
In order to solve the above technical problem, an embodiment of the present application provides a method and an apparatus for determining an oil-water interface position, which are implemented as follows:
a method of determining a location of an oil-water interface, comprising:
acquiring pressure measurement data at a plurality of water layer pressure measurement point positions and pressure measurement data at a plurality of oil layer pressure measurement point positions in a target layer section of a region to be measured; the target layer section comprises: an oil layer and an aqueous layer; the pressure measurement data includes: actually measured pressure and depth of the stratum;
determining a target hydrostatic pressure gradient according to the initial hydrostatic pressure gradient set and the pressure measurement data at the positions of the multiple water layer pressure measurement points;
determining pressure measuring reference surface pressure corresponding to the target layer section according to the target hydrostatic pressure gradient and pressure measuring data at the positions of the water layer pressure measuring points;
and determining the oil-water interface position of the target layer section according to the pressure measuring reference surface pressure, the target hydrostatic pressure gradient and pressure measuring data at the pressure measuring point positions of the oil layers.
In a preferred embodiment, the determining a target hydrostatic pressure gradient according to the initial hydrostatic pressure gradient set and the pressure measurement data at the plurality of water layer pressure measurement point positions includes:
and determining the target hydrostatic pressure gradient by adopting a trial and error method according to the initial hydrostatic pressure gradient set and the pressure measurement data at the positions of the plurality of water layer pressure measurement points.
In a preferred embodiment, the determining the target hydrostatic pressure gradient by using a trial and error method according to the initial hydrostatic pressure gradient set and the pressure measurement data at the plurality of water layer pressure measurement point positions includes:
determining residual pressure at the positions of the water layer pressure measuring points corresponding to the initial hydrostatic pressure gradient according to the formation measured pressure and the formation depth in the pressure measuring data at the positions of the water layer pressure measuring points and the initial hydrostatic pressure gradient in the initial hydrostatic pressure gradient set;
determining a fitting straight line of the residual pressure in the water layer corresponding to the initial hydrostatic pressure gradient according to the residual pressure at the positions of the water layer pressure measuring points and the depth of the stratum;
calculating residual pressure variances at the plurality of water layer pressure measuring point positions corresponding to the hydrostatic pressure gradient values; obtaining a residual pressure fitting straight line and a residual pressure variance correspondingly by using an initial hydrostatic pressure gradient, and obtaining a plurality of residual pressure fitting straight lines and a plurality of residual pressure variances correspondingly by using the initial hydrostatic pressure gradient set;
taking an initial hydrostatic pressure gradient as the target hydrostatic pressure gradient, which satisfies the following conditions: in the obtained fitting straight lines, the angle formed by the residual pressure fitting straight line and the residual pressure vertical line, which are obtained corresponding to the initial hydrostatic pressure gradient, is the minimum; or, in the obtained plurality of residual pressure variances, the initial hydrostatic pressure gradient is smallest corresponding to the obtained residual pressure variance.
In a preferred embodiment, when an included angle formed by a residual pressure fitting straight line and a residual pressure vertical line, which are correspondingly obtained by at least two initial hydrostatic pressure gradients in the initial hydrostatic pressure gradient set, is the same as and the smallest, the initial hydrostatic pressure gradient with the smallest residual pressure variance, which is correspondingly obtained by the at least two initial hydrostatic pressure gradients, is used as the target hydrostatic pressure gradient.
In a preferred embodiment, when residual pressure variances obtained by corresponding multiple initial hydrostatic pressure gradients in the initial hydrostatic pressure gradient set are the same and the smallest, the initial hydrostatic pressure gradient with the smallest included angle formed by a residual pressure fitting straight line and a residual pressure vertical line, which are obtained by corresponding multiple initial hydrostatic pressure gradients, is used as the target hydrostatic pressure gradient.
In a preferred embodiment, the determining, according to the target hydrostatic pressure gradient and the pressure measurement data at the plurality of water layer pressure measurement points, the pressure measurement reference surface pressure corresponding to the target interval includes:
determining target residual pressures corresponding to the plurality of water layer pressure measuring points respectively according to the target hydrostatic pressure gradient and the pressure measuring data at the plurality of water layer pressure measuring points;
and taking the average value of the target residual pressures corresponding to the positions of the plurality of water layer pressure measurement points as the pressure of the pressure measurement reference surface.
In a preferred embodiment, the determining the oil-water interface position of the target interval according to the pressure measurement reference surface pressure, the target hydrostatic pressure gradient and the pressure measurement data at the plurality of oil layer pressure measurement point positions includes:
determining target residual pressures corresponding to the multiple oil layer pressure measurement points respectively according to the measured formation pressure and the formation depth in the pressure measurement data at the multiple oil layer pressure measurement points and the target hydrostatic pressure gradient;
determining a target fitting straight line of the residual pressure in the oil layer according to the target residual pressure and the stratum depth which respectively correspond to the positions of the plurality of oil layer pressure measuring points;
and determining the oil-water interface position of the target layer section according to the target fitting straight line of the residual pressure in the oil layer and the pressure of the pressure measuring reference surface.
In a preferred embodiment, the determining the oil-water interface position of the target interval according to the target fitting straight line of the residual pressure in the oil reservoir and the pressure of the pressure measurement reference surface includes:
determining a target fitting straight line of the residual pressure in the water layer according to the pressure of the pressure measuring reference surface;
and taking the stratum depth corresponding to the intersection point of the residual pressure target fitting straight line in the oil layer and the residual pressure target fitting straight line in the water layer as the oil-water interface position of the target layer section.
In a preferred embodiment, the determining a target fitting straight line of the residual pressure in the water layer according to the pressure of the pressure measurement reference surface includes:
establishing a coordinate system with residual pressure as a horizontal coordinate and formation depth as a vertical coordinate;
and taking the vertical line with the residual pressure in the coordinate system as the pressure of the pressure measuring reference surface as the target fitting straight line of the residual pressure in the water layer.
An apparatus for determining a location of an oil-water interface, the apparatus comprising: the device comprises a pressure measurement data acquisition module, a target hydrostatic pressure gradient determination module, a pressure measurement reference surface pressure determination module and an oil-water interface position determination module; wherein,
the pressure measurement data acquisition module is used for acquiring pressure measurement data at a plurality of water layer pressure measurement point positions and pressure measurement data at a plurality of oil layer pressure measurement point positions in a target layer section of the region to be measured; the target layer section comprises: an oil layer and an aqueous layer; the pressure measurement data includes: actually measured pressure and depth of the stratum;
the target hydrostatic pressure gradient determining module is used for determining a target hydrostatic pressure gradient according to the initial hydrostatic pressure gradient set and the pressure measurement data at the plurality of water layer pressure measurement point positions;
the pressure measurement reference surface pressure determination module is used for determining pressure measurement reference surface pressure corresponding to the target layer section according to the target hydrostatic pressure gradient and the pressure measurement data at the plurality of water layer pressure measurement point positions;
and the oil-water interface position determining module is used for determining the oil-water interface position of the target layer section according to the pressure measuring reference surface pressure, the target hydrostatic pressure gradient and pressure measuring data at the pressure measuring point positions of the oil layers.
In a preferred embodiment, the pressure measurement reference surface pressure determining module includes: the device comprises a water layer residual pressure determining module and a reference surface pressure determining module; wherein,
the water layer residual pressure determining module is used for determining target residual pressures corresponding to the plurality of water layer pressure measuring points respectively according to the target hydrostatic pressure gradient and the pressure measuring data at the plurality of water layer pressure measuring points;
and the reference surface pressure determining module is used for taking the average value of the target residual pressures corresponding to the pressure measurement point positions of the plurality of water layers as the pressure of the pressure measurement reference surface.
In a preferred embodiment, the oil-water interface position determining module includes: the device comprises an oil layer residual pressure determining module, a fitting straight line determining module and an interface position determining module; wherein,
the oil layer residual pressure determining module is used for determining target residual pressures corresponding to the multiple oil layer pressure measuring points respectively according to the measured formation pressure and the formation depth in the pressure measuring data at the multiple oil layer pressure measuring points and the target hydrostatic pressure gradient;
the fitting straight line determining module is used for determining a target fitting straight line of the residual pressure in the oil layer according to the target residual pressure and the stratum depth which respectively correspond to the positions of the plurality of oil layer pressure measuring points;
and the interface position determining module is used for determining the oil-water interface position of the target layer section according to the residual pressure target fitting straight line in the oil layer and the pressure of the pressure measuring reference surface.
The embodiment of the application provides a method and a device for determining the position of an oil-water interface, which can acquire pressure measurement data at the positions of a plurality of water layer pressure measurement points and pressure measurement data at the positions of a plurality of oil layer pressure measurement points in a target layer section of a region to be measured. And determining a target hydrostatic pressure gradient according to the initial hydrostatic pressure gradient set and the pressure measurement data at the plurality of water layer pressure measurement point positions. And determining the pressure measuring reference surface pressure corresponding to the target layer section according to the target hydrostatic pressure gradient and the pressure measuring data at the positions of the water layer pressure measuring points. And determining the oil-water interface position of the target layer section according to the pressure measuring reference surface pressure, the target hydrostatic pressure gradient and pressure measuring data at the pressure measuring point positions of the oil layers. For the target interval with the heavy oil reservoir, the method can accurately obtain the intersection point position of the residual pressure target fitting straight line in the oil layer and the residual pressure target fitting straight line in the water layer according to the determined pressure measuring reference surface pressure, so that the accuracy of the determined oil-water interface position of the target interval can be improved.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a flow chart of an embodiment of a method of determining a location of an oil-water interface according to the present application;
FIG. 2 is a schematic diagram of a fitted straight line of residual pressure and formation depth corresponding to a target hydrostatic pressure gradient in an embodiment of the present application;
FIG. 3 is a block diagram of an embodiment of the apparatus for determining the location of an oil-water interface according to the present application;
FIG. 4 is a block diagram of a pressure determination module of a pressure measurement reference plane in an embodiment of the apparatus for determining an oil-water interface position according to the present disclosure;
FIG. 5 is a block diagram of an oil-water interface position determining module according to an embodiment of the present disclosure.
Detailed Description
The embodiment of the application provides a method and a device for determining the position of an oil-water interface.
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
FIG. 1 is a flow chart of an embodiment of a method for determining a location of an oil-water interface according to the present application. As shown in fig. 1, the method for determining the position of the oil-water interface includes the following steps:
step S101: and acquiring pressure measurement data at a plurality of water layer pressure measurement point positions and pressure measurement data at a plurality of oil layer pressure measurement point positions in a target layer section of the region to be measured.
The area to be measured can be the whole oil field area or a part of the area in the oil field. The target interval may form a single trap. A heavy oil reservoir is accumulated in the trap. The target interval may comprise: an oil layer and an aqueous layer. The pressure between the oil and water layers can be communicated without an additional barrier liquid layer between the two layers.
And the depths of the stratums at the positions of the water pressure measuring points in the target interval are different. And the depths of the stratums at the positions of a plurality of oil layer pressure measuring points in the target layer section are also different.
The pressure measurement data may include: the measured pressure and depth of the formation. The manometric data may be acquired by drilling and data acquisition.
Step S102: and determining a target hydrostatic pressure gradient according to the initial hydrostatic pressure gradient set and the pressure measurement data at the positions of the multiple water layer pressure measurement points.
A section of a work area may form a single trap. Within the trap may be accumulated a reservoir. In the interval, the remaining pressure at a formation depth is the difference between the measured pressure of the formation at the formation depth and the hydrostatic pressure at the formation depth. Wherein the residual pressure at different formation depths is the same, i.e., is a constant, in the water layer of the interval. In the reservoir of the interval, the residual pressure at any formation depth is greater than the constant, and the farther from the oil-water interface position, the greater the residual pressure. The constant is generally the pressure at the manometric reference surface corresponding to the interval. The remaining pressure at a pressure measurement point location in the interval can be generally expressed by the following equation:
Pr＝P-Pw＝P-Gwh (1)
in the formula (1), PrRepresents the residual pressure in pounds per square inch (psi) at the pressure measurement point location, and P represents the measured formation pressure in psi at the pressure measurement point locationwIndicates the hydrostatic pressure at the location of the pressure measurement point in psi, GwDenotes the hydrostatic pressure gradient, Gw＝0.1450377ρwg，ρwThe water density in grams per cubic centimeter (g/cm) of the formation state3) And g represents the gravitational acceleration and has a value of 9.78 meters per second squared (m/s)2) 0.1450377 is a unit conversion factor between the PSI unit system and the MPA unit system.
And determining a target hydrostatic pressure gradient according to the initial hydrostatic pressure gradient set and the pressure measurement data at the plurality of water layer pressure measurement point positions. The set of initial hydrostatic pressure gradients may be a preset set of hydrostatic pressure gradient values.
In one embodiment, the target hydrostatic pressure gradient may be determined by a trial and error method according to the initial set of hydrostatic pressure gradients and the manometry data at the plurality of water layer manometry point locations. Specifically, according to an initial hydrostatic pressure gradient in the initial hydrostatic pressure gradient set, and the formation measured pressure and the formation depth in the pressure measurement data at the multiple water layer pressure measurement point positions, the remaining pressure at the multiple water layer pressure measurement point positions corresponding to the initial hydrostatic pressure gradient may be determined. And determining a fitting straight line of the residual pressure in the water layer corresponding to the initial hydrostatic pressure gradient according to the residual pressure at the positions of the water layer pressure measurement points and the depth of the stratum. A residual pressure variance at the plurality of water gage pressure point locations corresponding to the hydrostatic pressure gradient value may be calculated. Thus, a residual pressure fitting straight line and a residual pressure variance are correspondingly obtained by one initial hydrostatic pressure gradient, and a plurality of residual pressure fitting straight lines and a plurality of residual pressure variances can be correspondingly obtained by the initial hydrostatic pressure gradient set. An initial hydrostatic pressure gradient satisfying the following condition may be taken as the target hydrostatic pressure gradient: and in the obtained fitting straight lines, the angle of an included angle formed by the residual pressure fitting straight line and the residual pressure vertical line, which are obtained correspondingly to the initial hydrostatic pressure gradient, is the minimum. And forming a coordinate system by taking the residual pressure at the position of the water layer pressure measurement point as an abscissa and the formation depth as an ordinate. The remaining pressure vertical line may be a vertical line parallel to the ordinate in the coordinate system.
Further, the residual pressure at the plurality of water pressure measuring point positions corresponding to the initial hydrostatic pressure gradient can be calculated by using the formula (1).
In another embodiment, when an included angle formed by a fitting straight line of residual pressure corresponding to at least two initial hydrostatic pressure gradients in the initial hydrostatic pressure gradient set and a vertical line of residual pressure is the same as and the smallest, the initial hydrostatic pressure gradient corresponding to the at least two initial hydrostatic pressure gradients with the smallest variance of residual pressure may be used as the target hydrostatic pressure gradient.
In another embodiment, an initial hydrostatic pressure gradient satisfying the following condition may be taken as the target hydrostatic pressure gradient: and in the obtained plurality of residual pressure variances, the initial hydrostatic pressure gradient is corresponding to the minimum obtained residual pressure variance.
In another embodiment, when residual pressure variances corresponding to a plurality of initial hydrostatic pressure gradients in the initial hydrostatic pressure gradient set are the same and minimum, the initial hydrostatic pressure gradient with the minimum included angle formed by the residual pressure fitted straight line corresponding to the plurality of initial hydrostatic pressure gradients and the residual pressure vertical line may be used as the target hydrostatic pressure gradient.
Step S103: and determining the pressure measuring reference surface pressure corresponding to the target layer section according to the target hydrostatic pressure gradient and the pressure measuring data at the positions of the water layer pressure measuring points.
Specifically, according to the target hydrostatic pressure gradient and the pressure measurement data at the plurality of water layer pressure measurement point positions, target residual pressures corresponding to the plurality of water layer pressure measurement point positions respectively may be determined. The average value of the target residual pressures corresponding to the plurality of water layer pressure measurement point positions may be used as the pressure measurement reference surface pressure.
Step S104: and determining the oil-water interface position of the target layer section according to the pressure measuring reference surface pressure, the target hydrostatic pressure gradient and pressure measuring data at the pressure measuring point positions of the oil layers.
And determining target residual pressures corresponding to the positions of the oil layer pressure measuring points respectively according to the measured formation pressure and the formation depth in the pressure measuring data at the positions of the oil layer pressure measuring points and the target hydrostatic pressure gradient. And determining a target fitting straight line of the residual pressure in the oil layer according to the target residual pressure and the stratum depth which respectively correspond to the positions of the plurality of oil layer pressure measuring points. And determining the oil-water interface position of the target layer section according to the target fitting straight line of the residual pressure in the oil layer and the pressure of the pressure measuring reference surface.
In one embodiment, the oil-water interface position of the target interval is determined according to the target fitting straight line of the residual pressure in the oil layer and the pressure of the pressure measuring reference surface. Specifically, the residual pressures at different stratum depths in the water layer are the same and are the pressure of the pressure measuring reference surface, and according to the pressure of the pressure measuring reference surface, a target fitting straight line of the residual pressure in the water layer can be determined. The depth of the formation corresponding to the intersection point of the residual pressure target fitting straight line in the oil layer and the residual pressure target fitting straight line in the water layer can be used as the oil-water interface position of the target interval.
In one embodiment, a target fit straight line of residual pressure in the water layer is determined according to the pressure of the pressure measuring reference surface. Specifically, a coordinate system may be established with residual pressure as abscissa and formation depth as ordinate. The perpendicular line, in which the residual pressure in the established coordinate system is the pressure of the pressure measuring reference surface, can be used as the target fitting straight line of the residual pressure in the water layer.
For example, fig. 2 is a schematic diagram of a fitted straight line of residual pressure and formation depth corresponding to a target hydrostatic pressure gradient in the embodiment of the present application. In fig. 2, the abscissa is the residual pressure and the ordinate is the formation depth. The formation depth corresponds to the residual pressure one to one. As shown in fig. 2, the pressure measurement reference surface pressure corresponding to the interval of interest is the average value of the residual pressure at a plurality of pressure measurement point positions in the water layer, i.e. 854.07 psi. Thus, the target fit straight line for residual pressure in the water layer is a perpendicular line with residual pressure of 854.07psi parallel to the ordinate. And taking the stratum depth corresponding to the intersection point of the residual pressure target fitting straight line in the oil layer and the vertical line as the oil-water interface position of the target layer section, namely the position with the stratum depth of 533.3 m. Therefore, for the target interval with the heavy oil reservoir, based on the determined pressure measuring reference surface pressure, the intersection point position of the residual pressure target fitting straight line in the oil reservoir and the residual pressure target fitting straight line in the water reservoir can be accurately obtained, and the oil-water interface position of the target interval can be accurately determined.
According to the method for determining the position of the oil-water interface, pressure measurement data at a plurality of water layer pressure measurement points and pressure measurement data at a plurality of oil layer pressure measurement points in the target layer section of the region to be measured can be obtained. And determining a target hydrostatic pressure gradient according to the initial hydrostatic pressure gradient set and the pressure measurement data at the plurality of water layer pressure measurement point positions. And determining the pressure measuring reference surface pressure corresponding to the target layer section according to the target hydrostatic pressure gradient and the pressure measuring data at the positions of the water layer pressure measuring points. And determining the oil-water interface position of the target layer section according to the pressure measuring reference surface pressure, the target hydrostatic pressure gradient and pressure measuring data at the pressure measuring point positions of the oil layers. For the target interval with the heavy oil reservoir, the method can accurately obtain the intersection point position of the residual pressure target fitting straight line in the oil layer and the residual pressure target fitting straight line in the water layer according to the determined pressure measuring reference surface pressure, so that the accuracy of the determined oil-water interface position of the target interval can be improved.
FIG. 3 is a block diagram of an embodiment of the present invention for determining the position of an oil-water interface. As shown in fig. 3, the oil-water interface position device may include: the device comprises a pressure measurement data acquisition module 100, a target hydrostatic pressure gradient determination module 200, a pressure measurement reference surface pressure determination module 300 and an oil-water interface position determination module 400.
The pressure measurement data acquisition module 100 may be configured to acquire pressure measurement data at multiple water layer pressure measurement points and pressure measurement data at multiple oil layer pressure measurement points in a target interval of the region to be measured; the target interval may comprise: an oil layer and an aqueous layer; the pressure measurement data may include: the measured pressure and depth of the formation.
The target hydrostatic pressure gradient determining module 200 may be configured to determine a target hydrostatic pressure gradient according to the initial hydrostatic pressure gradient set and the pressure measurement data at the multiple water layer pressure measurement point positions.
The pressure measurement reference surface pressure determining module 300 may be configured to determine the pressure measurement reference surface pressure corresponding to the target interval according to the target hydrostatic pressure gradient and the pressure measurement data at the multiple water layer pressure measurement point positions.
The oil-water interface position determining module 400 may be configured to determine the oil-water interface position of the target interval according to the pressure measurement reference surface pressure, the target hydrostatic pressure gradient, and the pressure measurement data at the multiple oil layer pressure measurement point positions.
FIG. 4 is a block diagram of a pressure measurement reference surface pressure determination module according to an embodiment of the present disclosure. As shown in fig. 4, the pressure measurement reference surface pressure determination module 300 of fig. 3 may include: a water layer residual pressure determination module 310 and a reference surface pressure determination module 320.
The water layer residual pressure determining module 310 may be configured to determine, according to the target hydrostatic pressure gradient and the pressure measurement data at the multiple water layer pressure measurement point positions, target residual pressures corresponding to the multiple water layer pressure measurement point positions, respectively.
The reference surface pressure determining module 320 may be configured to use an average value of the target residual pressures corresponding to the plurality of water layer pressure measurement points as the pressure measurement reference surface pressure.
FIG. 5 is a block diagram of an oil-water interface position determining module according to an embodiment of the present disclosure. As shown in fig. 5, the oil-water interface position determining module 400 in fig. 3 may include: a reservoir residual pressure determination module 410, a fitted straight line determination module 420, and an interface position determination module 430.
The oil layer residual pressure determining module 410 may be configured to determine, according to the measured formation pressure and the formation depth in the pressure measurement data at the multiple oil layer pressure measurement point positions, and the target hydrostatic pressure gradient, target residual pressures corresponding to the multiple oil layer pressure measurement point positions, respectively.
The fitting straight line determining module 420 may be configured to determine a target fitting straight line of the residual pressure in the oil layer according to the target residual pressure and the formation depth respectively corresponding to the multiple oil layer pressure measurement point positions.
The interface position determining module 430 may be configured to determine an oil-water interface position of the target interval according to the pressure measurement reference surface pressure and the target fit straight line of the residual pressure in the oil reservoir.
The embodiment of the device for determining the position of the oil-water interface corresponds to the embodiment of the method for determining the position of the oil-water interface, so that the embodiment of the method can be realized, and the technical effect of the embodiment of the method can be achieved.
In the 90 s of the 20 th century, improvements in a technology could clearly distinguish between improvements in hardware (e.g., improvements in circuit structures such as diodes, transistors, switches, etc.) and improvements in software (improvements in process flow). However, as technology advances, many of today's process flow improvements have been seen as direct improvements in hardware circuit architecture. Designers almost always obtain the corresponding hardware circuit structure by programming an improved method flow into the hardware circuit. Thus, it cannot be said that an improvement in the process flow cannot be realized by hardware physical modules. For example, a Programmable Logic Device (PLD), such as a Field Programmable Gate Array (FPGA), is an integrated circuit whose Logic functions are determined by programming the Device by a user. A digital system is "integrated" on a PLD by the designer's own programming without requiring the chip manufacturer to design and fabricate a dedicated integrated circuit chip 2. Furthermore, nowadays, instead of manually making an integrated Circuit chip, such Programming is often implemented by "logic compiler" software, which is similar to a software compiler used in program development and writing, but the original code before compiling is also written by a specific Programming Language, which is called Hardware Description Language (HDL), and HDL is not only one but many, such as abel (advanced Boolean Expression Language), ahdl (alternate Language Description Language), traffic, pl (core unified Programming Language), HDCal, JHDL (Java Hardware Description Language), langue, Lola, HDL, laspam, hardsradware (Hardware Description Language), vhjhd (Hardware Description Language), and vhigh-Language, which are currently used in most popular applications. It will also be apparent to those skilled in the art that hardware circuitry that implements the logical method flows can be readily obtained by merely slightly programming the method flows into an integrated circuit using the hardware description languages described above.
The controller may be implemented in any suitable manner, for example, the controller may take the form of, for example, a microprocessor or processor and a computer-readable medium storing 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, and an embedded microcontroller, examples of which include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicone Labs C8051F320, the memory controller may also be implemented as part of the control logic for the memory.
Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may thus be considered a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.
From the above description of the embodiments, it is clear to those skilled in the art that the present application can be implemented by software plus necessary general hardware platform. With this understanding in mind, the present solution, or portions thereof that contribute to the prior art, may be embodied in the form of a software product, which in a typical configuration includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory. The computer software product may include instructions for causing a computing device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in the various embodiments or portions of embodiments of the present application. The computer software product may be stored in a memory, which may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium. Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include transitory computer readable media (transient media), such as modulated data signals and carrier waves.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The application is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
While the present application has been described with examples, those of ordinary skill in the art will appreciate that there are numerous variations and permutations of the present application without departing from the spirit of the application, and it is intended that the appended claims encompass such variations and permutations without departing from the spirit of the application.
Claims (12)
1. A method of determining a location of an oil-water interface, comprising:
acquiring pressure measurement data at a plurality of water layer pressure measurement point positions and pressure measurement data at a plurality of oil layer pressure measurement point positions in a target layer section of a region to be measured; the target layer section comprises: an oil layer and an aqueous layer; the pressure measurement data includes: actually measured pressure and depth of the stratum;
determining a target hydrostatic pressure gradient according to the initial hydrostatic pressure gradient set and the pressure measurement data at the positions of the multiple water layer pressure measurement points;
determining pressure measuring reference surface pressure corresponding to the target layer section according to the target hydrostatic pressure gradient and pressure measuring data at the positions of the water layer pressure measuring points;
and determining the oil-water interface position of the target layer section according to the pressure measuring reference surface pressure, the target hydrostatic pressure gradient and pressure measuring data at the pressure measuring point positions of the oil layers.
2. The method for determining the position of the oil-water interface according to claim 1, wherein determining the target hydrostatic pressure gradient according to the initial hydrostatic pressure gradient set and the manometry data at the plurality of water layer manometry point positions comprises:
and determining the target hydrostatic pressure gradient by adopting a trial and error method according to the initial hydrostatic pressure gradient set and the pressure measurement data at the positions of the plurality of water layer pressure measurement points.
3. The method for determining the position of the oil-water interface according to claim 2, wherein the determining the target hydrostatic pressure gradient by using a trial and error method according to the initial set of hydrostatic pressure gradients and the manometry data at the plurality of water layer manometry point positions comprises:
determining residual pressure at the positions of the water layer pressure measuring points corresponding to the initial hydrostatic pressure gradient according to the formation measured pressure and the formation depth in the pressure measuring data at the positions of the water layer pressure measuring points and the initial hydrostatic pressure gradient in the initial hydrostatic pressure gradient set;
determining a fitting straight line of the residual pressure in the water layer corresponding to the initial hydrostatic pressure gradient according to the residual pressure at the positions of the water layer pressure measuring points and the depth of the stratum;
calculating residual pressure variances at the plurality of water layer pressure measuring point positions corresponding to the hydrostatic pressure gradient values; obtaining a residual pressure fitting straight line and a residual pressure variance correspondingly by using an initial hydrostatic pressure gradient, and obtaining a plurality of residual pressure fitting straight lines and a plurality of residual pressure variances correspondingly by using the initial hydrostatic pressure gradient set;
taking an initial hydrostatic pressure gradient as the target hydrostatic pressure gradient, which satisfies the following conditions: in the obtained fitting straight lines, the angle formed by the residual pressure fitting straight line and the residual pressure vertical line, which are obtained corresponding to the initial hydrostatic pressure gradient, is the minimum; or, in the obtained plurality of residual pressure variances, the initial hydrostatic pressure gradient is smallest corresponding to the obtained residual pressure variance.
4. The method according to claim 3, wherein when the included angle formed by the straight line fit of residual pressures corresponding to at least two initial hydrostatic pressure gradients in the set of initial hydrostatic pressure gradients and the vertical line of residual pressures is the same as and the smallest, the initial hydrostatic pressure gradient with the smallest variance of residual pressures corresponding to the at least two initial hydrostatic pressure gradients is taken as the target hydrostatic pressure gradient.
5. The method according to claim 3, wherein when the residual pressure variances corresponding to a plurality of initial hydrostatic pressure gradients in the initial hydrostatic pressure gradient set are the same and minimum, the initial hydrostatic pressure gradient with the minimum included angle formed by the residual pressure fitted straight line corresponding to the plurality of initial hydrostatic pressure gradients and the residual pressure vertical line is taken as the target hydrostatic pressure gradient.
6. The method for determining the position of the oil-water interface according to claim 1, wherein the determining, according to the target hydrostatic pressure gradient and the pressure measurement data at the positions of the pressure measurement points of the water layer, the pressure measurement reference surface pressure corresponding to the target layer section comprises:
determining target residual pressures corresponding to the plurality of water layer pressure measuring points respectively according to the target hydrostatic pressure gradient and the pressure measuring data at the plurality of water layer pressure measuring points;
and taking the average value of the target residual pressures corresponding to the positions of the plurality of water layer pressure measurement points as the pressure of the pressure measurement reference surface.
7. The method for determining the oil-water interface position according to claim 1, wherein determining the oil-water interface position of the target interval according to the manometric reference surface pressure, the target hydrostatic pressure gradient and manometric data at the plurality of oil layer manometric point positions comprises:
determining target residual pressures corresponding to the multiple oil layer pressure measurement points respectively according to the measured formation pressure and the formation depth in the pressure measurement data at the multiple oil layer pressure measurement points and the target hydrostatic pressure gradient;
determining a target fitting straight line of the residual pressure in the oil layer according to the target residual pressure and the stratum depth which respectively correspond to the positions of the plurality of oil layer pressure measuring points;
and determining the oil-water interface position of the target layer section according to the target fitting straight line of the residual pressure in the oil layer and the pressure of the pressure measuring reference surface.
8. The method for determining the oil-water interface position according to claim 7, wherein the determining the oil-water interface position of the target interval according to the target fit straight line of the residual pressure in the oil layer and the pressure of the pressure measuring reference surface comprises the following steps:
determining a target fitting straight line of the residual pressure in the water layer according to the pressure of the pressure measuring reference surface;
and taking the stratum depth corresponding to the intersection point of the residual pressure target fitting straight line in the oil layer and the residual pressure target fitting straight line in the water layer as the oil-water interface position of the target layer section.
9. The method for determining the position of the oil-water interface as claimed in claim 8, wherein the determining the target fit straight line of the residual pressure in the water layer according to the pressure of the pressure measuring reference surface comprises:
establishing a coordinate system with residual pressure as a horizontal coordinate and formation depth as a vertical coordinate;
and taking the vertical line with the residual pressure in the coordinate system as the pressure of the pressure measuring reference surface as the target fitting straight line of the residual pressure in the water layer.
10. An apparatus for determining a location of a water-oil interface, the apparatus comprising: the device comprises a pressure measurement data acquisition module, a target hydrostatic pressure gradient determination module, a pressure measurement reference surface pressure determination module and an oil-water interface position determination module; wherein,
the pressure measurement data acquisition module is used for acquiring pressure measurement data at a plurality of water layer pressure measurement point positions and pressure measurement data at a plurality of oil layer pressure measurement point positions in a target layer section of the region to be measured; the target layer section comprises: an oil layer and an aqueous layer; the pressure measurement data includes: actually measured pressure and depth of the stratum;
the target hydrostatic pressure gradient determining module is used for determining a target hydrostatic pressure gradient according to the initial hydrostatic pressure gradient set and the pressure measurement data at the plurality of water layer pressure measurement point positions;
the pressure measurement reference surface pressure determination module is used for determining pressure measurement reference surface pressure corresponding to the target layer section according to the target hydrostatic pressure gradient and the pressure measurement data at the plurality of water layer pressure measurement point positions;
and the oil-water interface position determining module is used for determining the oil-water interface position of the target layer section according to the pressure measuring reference surface pressure, the target hydrostatic pressure gradient and pressure measuring data at the pressure measuring point positions of the oil layers.
11. The apparatus of claim 10, wherein the pressure reference surface pressure determination module comprises: the device comprises a water layer residual pressure determining module and a reference surface pressure determining module; wherein,
the water layer residual pressure determining module is used for determining target residual pressures corresponding to the plurality of water layer pressure measuring points respectively according to the target hydrostatic pressure gradient and the pressure measuring data at the plurality of water layer pressure measuring points;
and the reference surface pressure determining module is used for taking the average value of the target residual pressures corresponding to the pressure measurement point positions of the plurality of water layers as the pressure of the pressure measurement reference surface.
12. The apparatus of claim 10, wherein the interface location module comprises: the device comprises an oil layer residual pressure determining module, a fitting straight line determining module and an interface position determining module; wherein,
the oil layer residual pressure determining module is used for determining target residual pressures corresponding to the multiple oil layer pressure measuring points respectively according to the measured formation pressure and the formation depth in the pressure measuring data at the multiple oil layer pressure measuring points and the target hydrostatic pressure gradient;
the fitting straight line determining module is used for determining a target fitting straight line of the residual pressure in the oil layer according to the target residual pressure and the stratum depth which respectively correspond to the positions of the plurality of oil layer pressure measuring points;
and the interface position determining module is used for determining the oil-water interface position of the target layer section according to the residual pressure target fitting straight line in the oil layer and the pressure of the pressure measuring reference surface.
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| CN112446065A (en) * | 2019-09-03 | 2021-03-05 | 中国石油天然气集团有限公司 | Oil-water interface depth determination method and system |
| CN113803054B (en) * | 2020-06-11 | 2024-04-09 | 中国石油化工股份有限公司 | Oil-water interface depth determining method and early warning method for preventing production well water channeling |
| CN111811988B (en) * | 2020-07-14 | 2023-05-12 | 中海石油(中国)有限公司 | Method for predicting gas-oil interface in trap based on fluid analysis and application thereof |
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