164 results about "Core test" patented technology

The invention belongs to the field of technical research on oil and gas reservoir development and particularly relates to a method for physically simulating sectional hydrofracture of different well types of perforated well shafts. The method comprises the following steps of: (1) processing a simulated shaft and arranging bullet holes on the well wall of the simulated shaft; (2) prefabricating the simulated shaft in the step (1) into an artificial core test sample and developing a hydrofracture physical simulation experiment by utilizing a true triaxial hydrofracture device system; and (3) observing fracture initiation and extension forms of hydraulic fractures at the positions of the bullet holes on the well wall of the simulated shaft by the hydrofracture physical simulation experiment in the step (2). According to the method, aiming at geological development blocks with different reservoir structures, different well types and fracture processes can be selected to carry out effective indoor simulation evaluation research; and the theoretical foundation is provided for design and scheme optimization of the hydrofracture process of conventional or unconventional dense oil and gas reservoirs and complex oil-gas blocked deposits.

The invention relates to a method for testing flow conductivity of self-supported cracks in riverfrac treatment. The method comprises the steps of: manufacturing a core test piece which satisfy closed state of the crack wall surface after pressure relief return of riverfrac treatment, drilling a phi 50*100 mm cylindrical test piece, enabling the cylindrical test piece to be orthogonal with a pre-formed scratch, splitting the pre-formed scratch to manufacture a tensile fracture type crack wall surface, dislocating the crack wall surface, smoothly grinding the end surface of the core test pieceto obtain a non-proppant non-engaged crack wall surface combination; then testing the flow conductivity of the crack, putting the manufactured core test piece into a core clamping system, simulating formation stress and temperature, setting and sending a control instruction, enabling each system to work and feed back signals, and finally, collecting the test results and calculating the flow conductivity of self-supported crack in the riverfrac treatment. The method in the invention can really reflect the tensile fracture and shear slip process of the riverfrac treatment, and reduce the process to a pressure and temperature environment under the ground to test the flow conductivity; and the test method is achievable.

The invention discloses a method for distinguishing a reservoir fluid type by adopting resistivity data, relating to the technological field of petroleum and gas logging, geology and core test analysis. The method comprises the following steps of: a. logging by utilizing core data scales and accurately calculating reservoir shale content, rock constituent and porosity; b. eliminating the influence of rock characters and the porosity on resistivity; c. utilizing a core test to obtain the parameters of m, a, n and b reflecting a pore structure, calculating the resistivity lower limit RR of an air layer and eliminating the influence of the pore structure on the resistivity; and d. distinguishing the reservoir fluid type by comparing a deep-induction and deep- lateral resistivity value RT andthe resistivity lower limit RR of the air layer obtained in the step c. The invention eliminates the influence of non-fluid factors of the rock characters, the porosity, the pore structure and the like on the resistivity, and maintains and utilizes the response characteristics of fluids with different resistivities so as to greatly enhance the coincidence rate for distinguishing the reservoir fluid type.

The invention discloses a method for judging the reservoir fluid type of a difference between density porosity and neutron porosity and relates to the technical fields of oil and gas logging and geology and core test analysis. The method comprises the following steps: 1) accurately calculating the shale content, the rock composition, the density porosity and the neutron porosity of a reservoir bycore data calibrating logging and logging data environmental correction; 2) removing the influence of factors of lithology, well diameter and mud invasion on density and neutron data; and 3) establishing standards for judging the reservoir fluid type by utilizing the response difference of the density and the neutron data to gas and formation water and by comparing the values of the density porosity and the neutron porosity. When the invention judges the reservoir fluid type by utilizing the density and the neutron data, non-fluid influencing factors, such as lithology, borehole conditions, mud invasion and the like are removed, therefore, influence features of different fluids to the density and the neutron data can be truly reflected, and the coincidence rate for judging the reservoir fluid type can be enhanced to above 90 percent from the existing 70 percent.

The invention discloses a method for judging the fluid type of a reservoir through an acoustic porosity-neutron porosity differential, which relates to the technical field of oil and gas logging, geology and core test analysis. The method comprises the following steps: 1) accurately calculating shale content, rock compositions, acoustic porosity and neutron porosity of the reservoir through core data calibration logging and logging data environment correction; 2) excluding the influence of factors such as lithology, borehole diameter and mud invasion on an acoustic transit time and neutron data; and 3) establishing a standard for judging the fluid type of the reservoir by comparing the magnitude of the acoustic porosity and the neutron porosity and using the response difference of the acoustic transit time and the neutron data to the gas and formation water. In the method, non-fluid influence factors such as the lithology, borehole conditions, mud invasion and the like are excluded when the fluid type of the reservoir is judged, so the characteristics of the influence of different fluids on the acoustic transit time and the neutron data can be grasped truly, and the coincidence rate of judging the fluid type of the reservoir is improved from 70 percent currently to over 90 percent.

A system and method for modeling technology to predict accurately water-oil relative permeability uses a type of artificial neural network (ANN) known as a Generalized Regression Neural Network (GRNN) The ANN models of relative permeability are developed using experimental data from waterflood core test samples collected from carbonate reservoirs of Arabian oil fields Three groups of data sets are used for training, verification, and testing the ANN models Analysis of the results of the testing data set show excellent correlation with the experimental data of relative permeability, and error analyses show these ANN models outperform all published correlations

A memory unit is described that has a controller coupled to a memory core through an interface circuit. The interface circuit has a test data input that receives test data from the controller. The interface circuit also has a system data input that receives data from a system. The interface circuit has a data output that is coupled to a data input of the memory core.

The invention discloses a method and a device for generating a test case, which are used for increasing the coverage on a core test scene so as to improve the efficiency for controlling fault leakage. The method comprises the following steps: combining test factors contained in a test class, and generating a plurality of test factor combinations; for each test factor combination, determining the priority of the test factor combination according to the attribute of each test factor in the test factor combination, and classifying the test factor combination into a set of the corresponding priority according to the priority of the test factor combination; selecting a corresponding quantity of test factor combinations from the set according to the test phase, the test coverage or the task cycle of the current test; and generating a test case based on the selected test factor combinations. By using the technical scheme, the coverage on a core test scene can be increased, and the efficiency for controlling fault leakage can be improved.

The invention discloses a three-dimensional multilayered multi-well fracturing prop crack real-time monitoring experimental system and method. The experimental system comprises a core test specimen, acore clamping device, a fully-three-dimensional multilayered stress loading device, a fracturing pumping-in device, a crack expansion real-time monitoring device and a control device. The invention provides the three-dimensional multilayered multi-well fracturing prop crack real-time monitoring experimental system and method, under the conditions that three-directional stress is applied, and twohorizontal directions are layered stresses, the core specimen which includes a plurality of shafts simulates hydraulic fracturing and sand supporting, by crack initiation on fracturing cracks and real-time and quantitative monitoring and later interpretation on crack induction stress of an expansion process, crack initiation of three-dimensional multilayered multi-well fracturing prop cracks and quantified description of the expansion process are realized, and the laying state of a propping agent in the cracks can be obtained.

The invention discloses a logging evaluation method suitable for a shale gas reservoir geological model, comprising following steps: building a prediction geological model and reservoir fracture pattern of a shale gas target interval area; determining a logging curve and basis for the logging curve to identify a fracture; confirming geological characteristic information of a horizontal well segment; restoring a geological model according to a variation relation between the geological characteristic information of the horizontal well segment and the horizontal well logging curve in connection with the prediction geological model; inspecting the reservoir fracture pattern and the restored geological model according to other drilling core tests near the horizontal well as well as shale gas production and testing results of a shale gas target interval. The method uses the logging information to restore the reservoir geological model, drilling risk is avoided, the accuracy for horizontal well trajectory design and target layer drilling catching is improved with cost saving; the method is applicable to shale horizontal well development and the development of other types of horizontal wells and is highly operable.

The invention discloses a nonvolatile memory IP core test and verify exploitation system, which comprises a power supply module used for providing power supply for each module in the system; a NVM IP core which is an object to be tested, to be exploited and to be verified; a BIST circuit which is connected to the NVM IP core and is used for testing the NVM IP; a host computer which has test software used for controlling the BIST circuit to operate various tests; a FPGA which is connected to the NVM IP core and is used for exploiting the NVM IP core; a FPGA configuration circuit which is connected to a FPGA chip and is used for downloading and writing of a FPGA digital logic; and a FPGA peripheral circuit which is used for connecting to the FPGA chip and is used for displaying and debugging. The nonvolatile memory IP core test and verify exploitation system integrates test, exploitation and verification as one body, the NVM IP core exploitation, exploitation and verification by the client is substantially accelerated, and the time and the cost of NVM IP core client flow sheet can be saved.

The invention discloses a method for improving the recovery ratio of normal heavy oil reservoirs in water-flooding development, comprising the steps of (1) preparing microgel and water to be 1000-3000mg/l of solution; (2), preparing surfactants and water to be 2000-3000mg/l of solution; and (3), filling a microgel solution slug and a surfactant solution slug from a water well, wherein the microgel is copolymer of acrylic amide and methylene diacrylamide; the surfactant is alkylbenzene sulfonate surfactant. In the invention, based on the characteristic of strong anisotropy of the water-flooding developed reservoirs, the method fully uses a movable microgel profile control action mechanism and a surfactant oil-displacing action mechanism in a composite system through a filled composite microgel profile control system, so that the method can improve the anisotropy in reservoir stratums and among reservoir stratums, solve a fingering condition, increase water-displacing waves and volumes and improve the displacement efficiency, thereby drastically improving the oil recovery; indoor core tests show that the total recovery ratio is up to 80-90%.

The invention discloses a testing device for the expansion coefficient of cement concrete for the road surface. The testing device comprises a water trough, a temperature detector, a linear differential displacement sensor and a data acquisition instrument, wherein the water trough can be used for placing a testing bracket and a cement concrete test piece; the temperature detector is buried in the cement concrete test piece and can be used for testing the temperature in the surface of the cement concrete test piece and the water temperature in the water trough; the linear differential displacement sensor is fixedly arranged at the upper end of the testing bracket and is connected with the upper end face of the cement concrete test piece to be tested; the data acquisition instrument is connected with the temperature sensor and the linear differential displacement sensor respectively. The invention further discloses a testing method using the testing device. According to the testing device and the testing method, the thermal expansion coefficient of a prepared test piece and a road surface field coring test piece can be determined rapidly so as to provide calculation and analysis evidences to road surface designing, performance judgment and service life predication.

The invention relates to an on-line monitoring system and a monitoring method for cold water in a convertor station. The system comprises a sampling system, a constant temperature system, a data acquisition and analysis system and a transmission system, wherein the sampling system is used for acquiring circulating water from a main circulating pipeline of the cold water in the convertor station, wherein the circulating water is used as sampling water; the constant temperature system is used for keeping the temperature of sensors of a measurement system within constant temperature; the data acquisition and analysis system is used for arranging all the sensors in the sampling water in the constant temperature system, transmitting information acquired by the sensors to a data analysis system through transmission lines and performing operational analysis; and the transmission system is used for transmitting results of the data acquisition and analysis system to a remote client through a network. The on-line monitoring system and the monitoring method have the following advantages that: a core test module can be replaced and the quantity of the sensors can be increased according to specific test content; and manual intervention is not required, various indexes of the cold water in the convertor station can be regularly monitored in real time, and the basis of establishing the optimal operating conditions of a circulation system of the cold water in the convertor station is provided.

The invention relates to a failure testing system for embedded logic cores in a system on chip, which is a circuit added for perfecting testability of the system on chip. The circuit thereof is composed of a testing access channel set, n testing loops, n logic core testing control units, a logic core testing control bus and a logic core testing selection control unit, wherein n is number of the logic cores in the system on chip. The invention can comprehensively test and access each deeply embedded logic core in the system on chip, and can guarantee mutual separation and effective control of each logic core in testing process. The circuit has simple structure and is applied to various systems on chip constructed by using embedded logic core design method.

The invention relates to an LED manufacturing technology which discloses a method for processing an LED rack for an LED bare core test and comprises a die attach and die bonding technology, a reeling and forming technology following the die attach and die bonding technology and a trimming technology; the reeling and forming technology comprises the following steps of: reeling a core wire between an upper rack tendon and a bowl cup, connecting a first electrode-pin with a second electrode-pin of each rack unit by the core wire and connecting the rack units in series, then applying epoxy resin on the core wire for curing and forming; and then carrying out the trimming technology. Compared with the prior art and with regards to the parameters of a LED chip, the LED manufacturing technology can be used to conduct a photoelectric test on an LED light with a bare core; therefore, the related parameters of the LED chip obtained are more accurate, which facilitates the research on LED chips.

The invention discloses a method for detecting cement dosage in a core test sample of a cement mixing pile, which comprises the following steps: directly mixing a field in-situ soil sample with water content without major changes into cement slurry with the same water-cement ratio during field construction, and preparing the test sample into the standard cylindrical test sample with unconfined compressive strength; placing the test sample in same-level in-situ plain soil for extrusion, sealing and maintenance after molding; carrying out EDTA titration after achieving the preset age, obtaining an attenuation law curve of consumption of disodium EDTA along with the age, and establishing standard curves in all the ages according to the attenuation law curve; and determining the consumption of EDTA in the sample, checking the cement dosage from the standard curve, and finally obtaining the cement dosage in the core test sample of the cement mixing pile. The method has simple operation, accurate detection result, good stability and good repeatability.

The invention relates to a displacement sensor test frock for electro hydraulic servovalve which includes a valve core test seat (7), a displacement measuring adjusting part(10), an iron core stem casing (6)and a fixed end cover (4)for the displacement sensor. The iron core stem casing (6) is arranged in the valve core test seat (7) and one end of the iron core stem casing is provided with an offsetting spring(5). The end cover (4) is connected with the iron core stem casing (6) and a displacement sensor loop (1) through a bolt. The displacement measuring adjusting part (10) is positioned andfixed by a bolt (9) and the valve core test seat (7) is fixed on a valve core test seat (8) with a bolt (11). The invention can better detect the linearity, the yield value and the changing range of the displacement sensor, and can detect the changing range, the linearity and the yield value of the feedback circuit voltage of a built-in amplifier matched with an electric feedback type servovalve,thereby being convenient for the debugging of the servovalve greatly, reducing the developing period and saving the developing cost.

The embodiment of the invention provides a pressurizing constant temperature control device and a core test system. The core test system comprises a CT (computerized tomography) scanner (1), a core holder (2), an injection pump (3), and the pressurizing constant temperature control device (4). The pressurizing constant temperature control device (4) comprises a motor (410), a gear set (420), a first circulating pump (431), a second circulating pump (432), a first temperature sensor (491), a second temperature sensor (492), a temperature control device (440), one-way valves (451-454), and an annular pressure pump (470). The two circulating pumps with opposite operational directions are used as a double power device, so that the problem that baking ovens and like products cannot be used to perform constant temperature control to core flooding experiments using the CT scanner in the prior art is solved.

The invention provides a method and a device for predicting rock drillability of a wildcat well before drilling. The method includes: picking up layer velocities of different layers of wildcat well rocks by the aid of a seismic velocity spectrum for the wildcat well rocks to be drilled; performing correlation analysis by the aid of the layer velocities of the different layers of the wildcat well and other drilled rocks, and selecting a certain drilled well with a rock structure similar to the wildcat well; training a feedforward BP (back-propagation) neural network according to seismic data and core test data of rocks of the selected drilled well to establish a model for predicting the rock drillability of the wildcat well before drilling; and predicting the rock drillability of the wildcat well by the aid of the trained feedforward BP neural network and the layer velocities of the different layers of the wildcat well rocks. By the aid of the method and the device, the relationship between each layer velocity and the rock drillability can be found, important data can be provided for reasonably selecting drilling modes, drill bit types and designed drilling parameters, drilling speed can be increased, and drilling cost can be reduced.

The invention relates to a laminated core testing device for testing laminated cores in a generator. To this end, the laminated core testing device comprises an exciting winding, which is situated parallel to a rotation axis of the generator and which is connected to a secondary alternating current generator, and comprises an infrared image acquisition device, which is designed for acquiring infrared recordings. Said secondary alternating current generator has a controllable frequency converter, and the secondary alternating current generator, at a frequency ranging from 400 to 600 Hz, provides, in a single-phase manner, an output of 200 kW with a controllable output voltage ranging from 0 to 3.0 kV.

A device test architecture and interface is provided to enable efficient testing embedded cores within devices. The test architecture interfaces to standard IEEE 1500 core test wrappers and provides high test data bandwidth to the wrappers from an external tester. The test architecture includes compare circuits that allow for comparison of test response data to be performed within the device. The test architecture further includes a memory for storing the results of the test response comparisons. The test architecture includes a programmable test controller to allow for various test control operations by simply inputting an instruction to the programmable test controller from the external tester. The test architecture includes a selector circuit for selecting a core for testing. Additional features and embodiments of the device test architectures are also disclosed.