WO2012074516A1 - Systems and methods for reducing reservoir simulator model run time - Google Patents
Systems and methods for reducing reservoir simulator model run time Download PDFInfo
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- WO2012074516A1 WO2012074516A1 PCT/US2010/058441 US2010058441W WO2012074516A1 WO 2012074516 A1 WO2012074516 A1 WO 2012074516A1 US 2010058441 W US2010058441 W US 2010058441W WO 2012074516 A1 WO2012074516 A1 WO 2012074516A1
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- reservoir simulator
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/22—Fuzzy logic, artificial intelligence, neural networks or the like
Definitions
- the present invention relates to systems and methods for reducing run time for a reservoir simulator model. More particularly, the present invention relates to reducing run time for a reservoir simulator model using a proxy model based on a neural network.
- a full physics numerical model also referred to as a reservoir simulator model is often used in the oil and gas industry to manage the reservoir and optimize production by determining numerous variables for the reservoir such as, for example, how many wells to drill, where to drill the wells, how to optimally manage water or gas injection, what facilities are needed and when they need to be operational, etc..
- a reservoir simulator model may also be used to manage the reservoir on a day-to-day or month-to-month basis to optimize production.
- the reservoir simulator model is intended to predict future production performance for the reservoir - meaning any numeric output common to numerical reservoir simulator models including production profiles, field and region pressures, bottom hole and top pressures and the like.
- Conventional reservoir simulator models are slow to execute. This problem associated with conventional reservoir simulator models is compounded because the models include hundred to millions of individual equations that must be executed simultaneously in order to execute the full model, which could take hours to days to complete.
- the present invention therefore, meets the above needs and overcomes one or more deficiencies in the prior art by providing systems and methods for generating a fast executing empirical proxy model of a reservoir simulator model.
- the present invention includes a method for reducing reservoir simulator model run time, which comprises: i) selecting each decision variable for a reservoir simulator model; ii) calculating an operational base case for the reservoir simulator model using a computer processor, the operational base case representing production rates or injection rates over a predetermined time period for each decision variable; iii) selecting each time step for the reservoir simulator model; iv) determining values for a distribution at each time step for each decision variable using the operational base case production rates or injection rates; v) selecting a minimum number of cases to generate for the reservoir simulator model, each case representing reservoir simulator model input data; and vi) calculating input data for the reservoir simulator model that is used to reduce the run time for the reservoir simulator model.
- the present invention includes a non-transitory program carrier device tangibly carrying computer executable instructions for reducing reservoir simulator model run time.
- the instructions are executable to implement: i) selecting each decision variable for a reservoir simulator model; ii) calculating an operational base case for the reservoir simulator model using a computer processor, the operational base case representing production rates or injection rates over a predetermined time period for each decision variable; iii) selecting each time step for the reservoir simulator model; iv) determining values for a distribution at each time step for each decision variable using the operational base case production rates or injection rates; v) selecting a minimum number of cases to generate for the reservoir simulator model, each case representing reservoir simulator model input data; and vi) calculating input data for the reservoir simulator model that is used to reduce the run time for the reservoir simulator model.
- FIG. 1 is a flow diagram illustrating one embodiment of a method for implementing the present invention.
- FIG. 2 is a flow diagram illustrating one embodiment of an algorithm for performing step 102 in FIG. 1
- FIG. 3 is a block diagram illustrating one embodiment of a system for implementing the present invention.
- the present invention addresses the use of neural networks to generate or build a proxy model to reduce the run time for a reservoir simulator model. It is difficult to use a reservoir simulator model in fast cycle decision support since these models take a long time to execute. Fluid flow equations, which are the basis of any reservoir simulator model, operate on a homogeneous medium, but the physical structures represented by the reservoir simulator model are inherently heterogeneous. In order to overcome this limitation, the entire reservoir is broken down into individual homogeneous cells (or blocks), which approximate the heterogeneity of the real reservoir. Fluid flow in the reservoir is basically triggered by pressure differences between simulation cells, between a simulation cell and a producer well, or between a simulation cell and an injector well.
- a proxy model is an empirical copy of a particular reservoir simulator model, which is accurate to only a particular limited set of operational regions.
- the proxy model can execute from four to even hundreds of times faster than the reservoir simulator model. Therefore, the proxy model can be used for fast-cycle decision support.
- data In order to construct the empirical proxy model, data must be generated from the reservoir simulator model.
- the proxy model is capable of predicting the gas, water and oil production rates or injection rates for the entire reservoir and also for individual wells given any set of predefined well production and injection targets.
- the proxy model is based on the operational challenge of responding to different constraints for the decision variables (e.g. when to open, close or restrict flow from production and injection wells) in the time frame of the evaluation.
- the proxy model therefore, addresses how to constrain the operational parameters for various decision variables in order to reduce the run time of the reservoir simulator model (/ ' . e. without having to run a full field numerical situation) while maintaining a reasonable representation of the reservoir simulator model.
- FIG. 1 a flow diagram illustrates one embodiment of a method
- the reservoir simulator model input data is calculated.
- the reservoir simulator model input data is represented by multiple cases wherein each case represents a value for all decision variables (e.g. well chokes, etc. that may be manipulated during the asset management decision support workflow) at every time step.
- the collection of cases therefore, represents the full operational range of interest for which the proxy model will be used. In this manner, the number of cases necessary to cover the full operational range of the reservoir simulator model can be reduced while still maintaining a reasonably accurate representation of the reservoir simulator model.
- FIG. 2 a flow diagram illustrates one embodiment of a method
- step 202 the total number of decision variables (n) for the reservoir simulator model are selected using the client interface/video interface described in reference to FIG. 3.
- the decision variables may represent chokes, surfaces pressures, gas lift and the like, which may be manipulated during the asset management decision support workflow.
- an operational base case for the reservoir simulator model is calculated over time by running the reservoir simulator model with the current best operational scenario inputs (e.g. choke settings, timing, etc.).
- the operational base case therefore, represents production rates or injection rates over a predetermined time period - meaning every time step - for each decision variable.
- step 206 the total number of time steps (m) for the reservoir simulator model are selected using the client interface/video interface described in reference to FIG. 3.
- the number of time steps and the time for each time step are selected and may be based on, for example, the base case production rates or injection rates from step 204.
- the production rate for each well can be plotted using the base case production rates or injection rates from step 204. The plot will show a spike in the early time and then a long decay over the life of the well.
- Signal processing theory teaches that between 5 and 12 equally spaced points are needed to describe a decline curve.
- points representing each time step might be selected beginning at the start of the decline and extending to where the production rate flattens in equal increments.
- each time step can be based upon heuristic rules like how often operating scenarios will allow movements of the well chokes or by more complex methods well known in the art.
- Each time step may be represented by hours, days, months, or years, for example.
- values for a distribution are determined at each of the total number of time steps (m) for each of the total number of decision variables (n).
- triangular distribution typically requires three values: a minimum value and a maximum value, which may be selected using the client interface/video interface described in reference to FIG. 3, and a most likely value that may be similarly selected or calculated.
- Each value represents the status of a decision variable at a given time step (t).
- a minimum choke value for example, may be set to a value representing a completely closed position for the choke at time step (t) and the maximum choke value may be set to a value representing a wide open position for the choke at time step (t).
- the most likely value at time step (t) may be selected from the production rates or injection rates in step 204 if each selected time step is identical to each respective time step for the predetermined time period. Alternatively, the most likely value may be calculated in such a way that when the choke movements are shifted from the base case to occur on the time steps selected in step 206, an identical cumulative production rate is calculated by both cases.
- step 209 the minimum number of cases (i.e reservoir simulator model input data) to generate for the reservoir simulator model is selected using the client interface/video interface described in reference to FIG. 3.
- the minimum number of cases must still be ten to one hundred times the number of decision variables selected in step 202.
- the minimum number of cases will be based on the minimum number of cases required to start the process, which may need to be increased depending on the results from step 114.
- the reservoir simulator model input data is calculated using a well known stochastic simulation algorithm such as, for example, Monte Carlo, Orthogonal Array and Latin Hypercube, and the results from steps 206 and 208.
- stochastic simulation algorithm such as, for example, Monte Carlo, Orthogonal Array and Latin Hypercube
- These algorithms are generally "exhaustive" search methods that normally require many thousands of cases of input data for the reservoir simulator model.
- the results from steps 206 and 208 are therefore, used to constrain the reservoir simulator model input data by limiting the number of cases to be equal to or greater than the minimum number of cases selected, with only the number of time steps selected in step 206, and which have values for the distribution calculated in step 208.
- the constrained number of cases generally represents 15-20% of the total number of cases that would otherwise be required using an unconstrained stochastic simulation algorithm.
- the reservoir simulator model input data is represented by (n x m) values for (x) number of cases.
- proxy model data are calculated using the reservoir simulator model input data from step 102 and the reservoir simulator model.
- the reservoir simulator model algorithm processes only the constrained runs determined by step 210 in a batch mode to calculate the proxy model data.
- the proxy model data comprises data that may be used for training (training data), testing (testing data) and validation (validation data).
- the proxy model data may be separated and marked as training data, testing data and validation data as it is calculated or, alternatively, after it is calculated.
- the proxy model data may be separated and marked by any predetermined criteria or randomly.
- step 106 total number of proxy model input variables are selected equal to the total number of decision variables for each time step using the client interface/video interface described in reference to FIG. 3.
- the proxy model architecture is determined using a neural network and the proxy model input variables selected from step 106.
- the neural network is a parallel mathematical structure composed of nodes, which calculate an individual result to be passed on to the other nodes for further processing.
- the proxy model architecture therefore, represents the total number of required nodes, which is determined using techniques well known in the art and the total number of proxy model input variables from step 106. Each nodes requires a value as a coefficient, which is determined by a training activity.
- the proxy model architecture coefficient values are calculated for each node in the proxy model architecture using techniques well known in the art such as, for example, back propagation or an optimization solver subroutine.
- the data used for each coefficient (node) is the training data and the testing data from step 104.
- the neural network is referred to as being trained and represents a proxy model.
- the coefficient values are also often referred to as weights and biases.
- proxy model output data is calculated using the proxy model validation data from step 102 and the proxy model from step 110.
- step 114 the method 100 compares the proxy model output data from step 112 and the proxy model validation data from step 104 to determine if they are equal. If the proxy model output data equals the proxy model validation data, then the method 100 proceeds to step 116. If the proxy model output data does not equal the proxy model validation data, then the method 100 returns to step 102 to recalculate the reservoir simulator model input data using a larger minimum number of cases. In this manner, steps 102-114 are repeated until the proxy model output data is equal to the proxy model validation data.
- step 116 asset performance is forecasted using the trained and validated proxy model.
- the proxy model may be used in a fast- cycle decision process such as, for example, daily forecasting and daily optimization.
- the daily forecasting workflow the current operational settings are run through the proxy model to predict the asset production for a predefined number of years. The operation's team can then determine what needs to be done to modify the status quo using the proxy model in a trial and error manner.
- the desired end state of the asset is set by a user and iteratively uses the proxy model to determine where to set the asset decision variables ⁇ e.g. chokes) to achieve a predefined objective.
- the method 100 has been proven to generate accurate proxy models in 15%-20% of the time that standard exhaustive stochastic simulation algorithms would take.
- the resulting proxy models have also demonstrated accuracy to within 2.5% (see tables 1-3) of conventional reservoir simulator models and can execute the full model in one-quarter of the time that it takes the conventional reservoir simulator model to execute the full model.
- the present invention may be implemented through a computer-executable program of instructions, such as program modules, generally referred to as software applications or application programs executed by a computer.
- the software may include, for example, routines, programs, objects, components, and data structures that perform particular tasks or implement particular abstract data types.
- the software forms an interface to allow a computer to react according to a source of input.
- AssetConnectrM and AssetSolverTM which are commercial software applications marketed by Landmark Graphics Corporation, may be used to implement the present invention.
- the software may also cooperate with other code segments to initiate a variety of tasks in response to data received in conjunction with the source of the received data.
- the software may be stored and/or carried on any variety of memory media such as CD-ROM, magnetic disk, bubble memory and semiconductor memory (e.g., various types of RAM or ROM). Furthermore, the software and its results may be transmitted over a variety of carrier media such as optical fiber, metallic wire and/or through any of a variety of networks such as the Internet. [0034] Moreover, those skilled in the art will appreciate that the invention may be practiced with a variety of computer-system configurations, including hand-held devices, multiprocessor systems, microprocessor-based or programmable-consumer electronics, minicomputers, mainframe computers, and the like. Any number of computer-systems and computer networks are acceptable for use with the present invention.
- the invention may be practiced in distributed-computing environments where tasks are performed by remote-processing devices that are linked through a communications network.
- program modules may be located in both local and remote computer- storage media including memory storage devices.
- the present invention may therefore, be implemented in connection with various hardware, software or a combination thereof, in a computer system or other processing system.
- FIG. 3 a block diagram illustrates one embodiment of a system for implementing the present invention on a computer.
- the system includes a computing unit, sometimes referred to a computing system, which contains memory, application programs, a client interface, a video interface and a processing unit.
- the computing unit is only one example of a suitable computing environment and is not intended to suggest any limitation as to the scope of use or functionality of the invention.
- the memory primarily stores the application programs, which may also be described as program modules containing computer-executable instructions, executed by the computing unit for implementing the present invention described herein and illustrated in FIGS. 1-2.
- the memory therefore, includes a run time reduction module, which enables the methods illustrated and described in reference to FIGS. 1-2 and integrates functionality from the remaining application programs illustrated in FIG. 3.
- the run time reduction module may be used to execute many of the functions described in reference to step 102 in FIG. 1.
- AssetConnectTM may be used, for example, to execute the functions described in reference to steps 104 and 116 in FIG. 1.
- AssetSolverTM may be used, for example, to execute the functions described in reference to steps 108, 110, 112 and 116 in FIG. 1.
- the computing unit typically includes a variety of computer readable media.
- computer readable media may comprise computer storage media.
- the computing system memory may include computer storage media in the form of volatile and/or nonvolatile memory such as a read only memory (ROM) and random access memory (RAM).
- ROM read only memory
- RAM random access memory
- a basic input/output system (BIOS) containing the basic routines that help to transfer information between elements within the computing unit, such as during start-up, is typically stored in ROM.
- the RAM typically contains data and/or program modules that are immediately accessible to and/or presently being operated on by the processing unit.
- the computing unit includes an operating system, application programs, other program modules, and program data.
- the components shown in the memory may also be included in other removable/non-removablc, volatile/nonvolatile computer storage media or they may be implemented in the computing unit through application program interface ("API"), which may reside on a separate computing unit connected through a computer system or network.
- API application program interface
- a hard disk drive may read from or write to non-removable, nonvolatile magnetic media
- a magnetic disk drive may read from or write to a removable, non-volatile magnetic disk
- an optical disk drive may read from or write to a removable, nonvolatile optical disk such as a CD ROM or other optical media.
- removable/non-removable, volatile/non-volatile computer storage media may include, but are not limited to, magnetic tape cassettes, flash memory cards, digital versatile disks, digital video tape, solid state RAM, solid state ROM, and the like.
- the drives and their associated computer storage media discussed above provide storage of computer readable instructions, data structures, program modules and other data for the computing unit.
- a client may enter commands and information into the computing unit through the client interface, which may be input devices such as a keyboard and pointing device, commonly referred to as a mouse, trackball or touch pad.
- Input devices may include a microphone, joystick, satellite dish, scanner, or the like.
- a monitor or other type of display device may be connected to the system bus via an interface, such as a video interface.
- a graphical user interface may also be used with the video interface to receive instructions from the client interface and transmit instructions to the processing unit.
- computers may also include other peripheral output devices such as speakers and printer, which may be connected through an output peripheral interface.
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Priority Applications (9)
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US13/990,753 US10409616B2 (en) | 2010-11-30 | 2010-11-30 | Systems and methods for reducing reservoir simulator model run time |
CN201080070418XA CN103329116A (en) | 2010-11-30 | 2010-11-30 | Systems and methods for reducing reservoir simulator model run time |
MX2013006155A MX2013006155A (en) | 2010-11-30 | 2010-11-30 | Systems and methods for reducing reservoir simulator model run time. |
CA2819334A CA2819334A1 (en) | 2010-11-30 | 2010-11-30 | Systems and methods for reducing reservoir simulator model run time |
AU2010364957A AU2010364957B2 (en) | 2010-11-30 | 2010-11-30 | Systems and methods for reducing reservoir simulator model run time |
PCT/US2010/058441 WO2012074516A1 (en) | 2010-11-30 | 2010-11-30 | Systems and methods for reducing reservoir simulator model run time |
EP10860155.0A EP2646927A4 (en) | 2010-11-30 | 2010-11-30 | Systems and methods for reducing reservoir simulator model run time |
EA201390784A EA201390784A1 (en) | 2010-11-30 | 2010-11-30 | METHOD FOR REDUCING THE TIME OF MODELING THE NATURAL TANK OF HYDROCARBONS |
BR112013013422A BR112013013422A2 (en) | 2010-11-30 | 2010-11-30 | method for reducing the reservoir simulator model execution time, and program-carrying device |
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CN102870087B (en) | 2010-04-30 | 2016-11-09 | 埃克森美孚上游研究公司 | The method and system of fluid limited bulk emulation |
CA2803068C (en) | 2010-07-29 | 2016-10-11 | Exxonmobil Upstream Research Company | Method and system for reservoir modeling |
WO2012015515A1 (en) | 2010-07-29 | 2012-02-02 | Exxonmobil Upstream Research Company | Methods and systems for machine-learning based simulation of flow |
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US8994549B2 (en) * | 2011-01-28 | 2015-03-31 | Schlumberger Technology Corporation | System and method of facilitating oilfield operations utilizing auditory information |
WO2013039606A1 (en) | 2011-09-15 | 2013-03-21 | Exxonmobil Upstream Research Company | Optimized matrix and vector operations in instruction limited algorithms that perform eos calculations |
US10036829B2 (en) | 2012-09-28 | 2018-07-31 | Exxonmobil Upstream Research Company | Fault removal in geological models |
WO2014200669A2 (en) | 2013-06-10 | 2014-12-18 | Exxonmobil Upstream Research Company | Determining well parameters for optimization of well performance |
WO2016004137A1 (en) * | 2014-06-30 | 2016-01-07 | Advantek International Corporation | Slurrification and disposal of waste by pressure pumping into a subsurface formation |
WO2016018723A1 (en) | 2014-07-30 | 2016-02-04 | Exxonmobil Upstream Research Company | Method for volumetric grid generation in a domain with heterogeneous material properties |
EP3213125A1 (en) | 2014-10-31 | 2017-09-06 | Exxonmobil Upstream Research Company Corp-urc-e2. 4A.296 | Methods to handle discontinuity in constructing design space for faulted subsurface model using moving least squares |
WO2016069171A1 (en) | 2014-10-31 | 2016-05-06 | Exxonmobil Upstream Research Company | Handling domain discontinuity in a subsurface grid model with the help of grid optimization techniques |
WO2016115004A1 (en) * | 2015-01-12 | 2016-07-21 | Schlumberger Canada Limited | Automatic timestep adjustment for reservoir simulation |
US20160370772A1 (en) * | 2015-06-22 | 2016-12-22 | Invensys Systems, Inc. | Process optimization using mixed integer nonlinear programming |
EP3559401B1 (en) | 2016-12-23 | 2023-10-18 | ExxonMobil Technology and Engineering Company | Method and system for stable and efficient reservoir simulation using stability proxies |
CA3090095C (en) * | 2018-04-18 | 2023-08-01 | Landmark Graphics Corporation | Methods and systems to determine and optimize reservoir simulator performance in a cloud computing environment |
US20210131260A1 (en) * | 2019-10-31 | 2021-05-06 | Landmark Graphics Corporation | Model parameter reductions and model parameter selection to optimize execution time of reservoir management workflows |
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CN103329116A (en) | 2013-09-25 |
CA2819334A1 (en) | 2012-06-07 |
BR112013013422A2 (en) | 2016-10-11 |
EA201390784A1 (en) | 2013-12-30 |
US10409616B2 (en) | 2019-09-10 |
MX2013006155A (en) | 2014-10-24 |
AU2010364957A1 (en) | 2013-06-13 |
EP2646927A4 (en) | 2016-06-15 |
EP2646927A1 (en) | 2013-10-09 |
US20130338985A1 (en) | 2013-12-19 |
AU2010364957B2 (en) | 2015-04-23 |
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