80 results about "Reservoir modelling" patented technology

A method for estimating and/or reducing uncertainty in reservoir models of potential petroleum reservoirs comprises receiving the results of a stochastic seismic inversion, and transforming the inversion data into a form suitable for reservoir modelling and flow simulations, while honoring inter-property and inter-layer correlations in the inversion data as well as measured well data and other geological constraints.

The invention stimulates the production of an oil reservoir by carrying out a sequence of steps of constructing a flow simulator from physical data measured in the oil reservoir; determining a first analytical model relating the production of the reservoir as a function of time by taking account of parameters having an influence on the production of the reservoir, the first model best adjusting to a finite number of production values obtained by the reservoir simulator; selecting at least one new production value, this new value being obtained by the reservoir simulator; and determining a second model by adjusting the first model so that the second model interpolates the new production value.

A CO₂ sequestration site is evaluated by incorporating a consistent petrophysical framework having uncertainties expressed in the form of probability density functions of wellbore measurements, by systematically propagating the uncertainties in generating probability density functions or cumulative distribution functions of the parameters used in a reservoir simulation, by using the reservoir simulation to transform the first set of parameters into output variables with uncertainties, and by using the output variables and uncertainties to generate an answer product from which uncertainty levels of performance metrics can be ascertained.

A method producing full field radial grid (called here Radial-X Grid) for more accurate and efficient reservoir simulation and improving simulation work flow. The Radial-X Grid method produces both aerial and vertical gridding to divide a reservoir structure into simulation grid cells. The aerial gridding is performed by 1) specifying a reservoir boundary (including faults) and well locations; 2) distributing a set of concentric circles around each well location; 3) determining the circle-circle and circle-boundary intersection locations of these circles; 4) forming the aerial grid by selecting circles, arc segments of intersecting circles and radial lines which connect the ends of these arc segments to the corresponding well center; 5) and forming additional grid lines by selecting the connecting lines of two wells if their circles intersect, adding additional radial lines to certain wells, and connecting end points of certain selected arc segments. Thus, the aerial boundary of each individual grid cell is formed from elements selected from the group of arc segment, well radial line, reservoir boundary, connection line of well to well, arc segment end to arc segment end. The vertical gridding is performed by casting the aerial grid vertically downwardly through all the layers defined in the reservoir structure. The Radial-X Grid method is advantageous for petroleum reservoir simulation applications because it is easy to use, runs fast, produces no grid orientation effect, provides efficient use of grid cells, provides precision modeling and provides better reservoir boundary and fault conformance.

Systems and methods for dynamically developing a wellbore plan with a reservoir simulator. The systems and methods develop a plan for multiple wellbores with a reservoir simulator based on actual and potential reservoir performance.

The invention discloses a test simulating device for improving a recovery rate of coal bed methane by injecting carbon dioxide. The test simulating device for improving the recovery rate of the coal bed methane by injecting the carbon dioxide comprises a coal reservoir simulating system, a gas injecting system, a fracture simulating carbon dioxide injecting system, a carbon dioxide absorbing device and a data collection and control system, wherein the coal reservoir simulating system is used for simulating the conditions of pressure and temperature of a coal reservoir, the gas injecting system is used for injecting methane gas or helium gas into the coal reservoir simulating system, the fracture simulating carbon dioxide injecting system is used for injecting high-pressure liquid into the coal reservoir simulating system, enabling the coal reservoir simulating system to simulate the degree of development of fractures, and injecting the carbon dioxide into the coal reservoir simulating system, the carbon dioxide absorbing device is used for absorbing the carbon dioxide exhausted by the coal reservoir simulating system, and the data collection and control system is used for collecting data and carrying out process control. The test simulating device for improving the recovery rate of the coal bed methane by injecting the carbon dioxide is capable of simulating the real conditions of the coal reservoir, simulating on-spot fracturing and the process of pump injection of the carbon dioxide, simulating effects of improvement of the recovery rate of the coal bed methane by injecting different volumes of the carbon dioxide according to different degrees of the development of the fractures and different conditions of the coal reservoir, and achieving an optimal carbon dioxide injection volume aiming at a specific coal reservoir.

Larger, expandable high performance computing (HPC) clusters which are of different generations and performance speeds are provided for reservoir simulation. This provides scalability and flexibility for running computation-intensive reservoir simulation jobs on HPC machines. Availability of larger numbers of processors in a processor pool makes simulation of giant models possible and also reduces fragmentation when multiple jobs are run. A hardware performance based domain decomposition is performed which results in computation load balancing. The reservoir domain is decomposed efficiently to reduce communication overhead. Adaptive detection of the available mix of computation resources is performed, and reservoir simulation decomposition methodology adjusts the distribution of load based on the available hardware and different processor generation resources to minimize the reservoir simulation runtime.

A method is disclosed, which is practiced by a reservoir simulator, for simulating a reservoir and generating a set of simulation results, the simulation results including a framework, the framework further including a plurality of grid cells, comprising: generating one or more static and dynamic regions within the grid cells of the framework of the simulation results, the static and dynamic regions each having region values, wherein the region values of the static regions cannot be allowed to change dynamically, and wherein the region values of the dynamic regions can be allowed to change dynamically.

A device for observing transportation of a propping agent in a fracturing process of a coal reservoir comprises a coal reservoir simulating system, a confining pressure loading system, a fracturing fluid pumping-in system, a data acquiring and analyzing system and a waste treatment system, wherein the fracturing fluid pumping-in system is connected with a liquid inlet of the coal reservoir simulating system; and the waste treatment system is connected with a liquid outlet of the coal reservoir simulating system. For solving the problems that distribution conditions of a fractured propping agent in fracture channels of coal beds are unclear under different fracturing operational discharge capacity, propping agent concentration, liquid levels and fracture development of the coal reservoir, and field fracturing design cannot be guided effectively, a visualized device which simulates transportation and laying of the propping agent in a fracturing process under different fracture development degrees of the coal reservoir and different pumping-in diameters is designed. By the device, the laying condition of the propping agent fractured under different conditions can be observed clearly, so that experimental basis can be provided for field fracturing design.

The invention provides a large-scale natural gas hydrate formation and decomposition geological environment simulation system. The large-scale natural gas hydrate formation and decomposition geological environment simulation system comprises a natural gas hydrate reservoir simulation cavity, a stratum temperature control system, a gas-liquid injection system, an exploitation well system, a production system, a pressure sensor, a displacement sensor and an information acquisition control system; the gas-liquid injection system is in communication with the bottom of a cavity; the exploitation well system is arranged inside the cavity; the production system is connected with the output end of the exploitation well system; the output end of the production system is connected with the input endof the gas-liquid injection system; the pressure sensor is arranged in a simulation layer; the displacement sensor is arranged in the simulation layer; and the information acquisition control systemis electrically connected with the pressure sensor, a temperature control device, the gas-liquid injection system, the production system and the displacement sensor. The invention further provides a simulation method, in-situ geological stratification construction of the natural gas hydrate reservoir in the sea area is achieved, the geological environment system simulation requirement in the large-scale natural gas hydrate forming and decomposing process is met, and the defect that a small-scale simulation system is difficult to achieve pressure gradient changes in a real natural gas hydrate reservoir is overcome.

The invention discloses a simulation method and device for stripping and transporting hydrate reservoir sediment during depressurization. The simulation device comprises a reservoir simulation module,a supply module, a pressure control module, a temperature control module and a recovery module. The reservoir simulation module is used for loading loose deposits, forming a hydrate reservoir and observing a sediment stripping initiation process and comprises a microscopic visual module, a pure radial flow reservoir simulation module and a non-radial flow reservoir simulation module. The influences of the different streamline patterns and a hydrate distribution law on the initiation and migration process of hydrate reservoir sands are considered, hydrate reservoirs under different hydrate saturations and different hydrate distribution patterns are prepared through the reservoir, that the hydrate is in an undecomposed state in a subsequent sand production mechanism analysis experiment is guaranteed, a critical pressure drop condition of sand production and an sand production pattern evolution law are discussed, and a technical support is provided for the prediction of a sand productionlaw in an actual production well.

An embodiment includes a method for use by at least one machine learning classifier. The method comprises the machine learning classifier obtaining one or more recent results from at least one geomechanical simulation; the machine learning classifier comparing the recent results to stored historical data; and, based on the comparing, the machine learning classifier deciding at least one reservoir model for use by at least one reservoir simulation.

The invention is a method of constructing an optimized mesh for reservoir simulation in a subterranean formation useful for exploration in exploitation of oil deposits. At an instant T of the reservoir simulation, a size function is estimated, characterizing the initial mesh representative of the subterranean formation being studied. Next the flow of the fluids within the formation at this instant T is simulated by use of a reservoir simulator and of the initial mesh. An optimized size function is thereafter computed by use of the size function estimated on the initial mesh and of at least one parameter deduced from the reservoir simulation. And finally, an optimized mesh is constructed by modifying the initial mesh as a function of the optimized size function.

The invention discloses a three-dimensional heterogeneous oil-reservoir multi-well-pattern mode water flooding physical simulation experiment device. The three-dimensional heterogeneous oil-reservoirmulti-well-pattern mode water flooding physical simulation experiment device comprises a reservoir simulation system, an injection system and an experimental measurement system, wherein the injectionsystem and the experimental measurement system are separately connected with the reservoir simulation system. The reservoir simulation system comprises an experiment box, an insulating filter screen and a measurement electrode. The insulating filter screen is detachably arranged to divide the experiment box into multiple layers; the injection system comprises an injection pump, an oil-and-water storage tank, a pressure gauge and a multiported valve, wherein the injection pump, the oil-and-water storage tank, the pressure gauge and the multiported valve are connected in sequence; the oil-waterstorage tank is connected with each layer of the experiment box through the multiported valve and an injection pipeline; and the experimental measurement system comprises a multi-channel resistance measurement instrument and a flow measurement system, wherein the multi-channel resistance measurement instrument is connected with the measuring electrode, and the flow measurement system is connectedwith each layer of the experiment box through discharging pipelines. According to the three-dimensional heterogeneous oil-reservoir multi-well-pattern mode water flooding physical simulation experiment device, multi-layer filling and leveling degree is ensured, the development of an interlayer can be more accurately simulated, the oil-and-water production can be measured in layers under the simulated multi-well-pattern mode, and the resistance is measured in real time to obtain the saturation distribution.

A method for operating an oil deposit based on a technique of positioning wells to be drilled is disclosed. Based on a grid representative of the petrophysical properties of a subterranean formation through at least one well is drilled, a reservoir simulation is performed up to a time for which production of the formation being studied is to be predicted. Then, attributes are selected that are representative of the flows in the formation and a classification of these attributes is performed. Then, a quality indicator is computed for each of the classes and at least one class is selected such that its quality indicator is greater than a first threshold.

Machine, computer readable medium, program code, and computer-implemented methods for performing a reservoir simulation with well completion and reservoir grid data quality assurance, are provided. An exemplary embodiment can include a data quality analyzing machine having memory containing data quality analyzing instructions configured to simulate a reservoir model with automated well completion and reservoir grid data quality assurance.

Computer system performance is improved during reservoir simulation runs where heterogeneous rock formations suffer from convergence problems. Convergence problems are affected by accurate determination of pressure distribution for reservoir simulation, which is very complex when properties or attributes of reservoir rock formations are heterogeneous. In heterogeneous reservoir rock formations, pressure distribution is affected over three dimensions by variations of rock permeability and porosity. The difficulty in convergence of the simulation runs results in increased computer operation and processing time and consequent computer usage costs. Improved determination of pressure distribution in heterogeneous rock formations permits acceptable initial pressure measures for pressure determination during reservoir simulation and to reduce convergence problems with existing reservoir simulation.

The invention discloses a reservoir simulation unit and a CO2 dissolution distribution evaluation device and method thereof, and belongs to the technical field of oilfield development. The reservoir simulation unit comprises a container capable of being closed; a partition communication component is arranged in the container and divides the container into a sand filling chamber and a bottom water chamber, and the sand filling chamber and the bottom water chamber are communicated through the partition communication component; the sand filling chamber is located on the upper portion of the bottom water chamber; and a plurality of injection and production openings are formed in the container wall, corresponding to the area where the sand filling chamber is located, of the container at different heights. The reservoir simulation unit and the CO2 dissolution distribution evaluation device and method thereof are suitable for CO2 gas injection dissolution evaluation and can effectively meet the experimental requirements for gas injection dissolution evaluation of N2, CO2+ N2 composite gas, flue gas and the like.