48 results about "Potential curves" patented technology

The invention provides a method and device for measuring the original thickness of a longshore bar in the ancient lake. The method comprises the steps that the distribution range of the longshore bar is determined according to a deposition distribution map of an ancient deposition period, and a well tie profile map of the longshore bar is drawn; a natural potential curve of the well tie profile map is divided into multiple sub-units; the area corresponding to the sub-units meeting a standard curve is used as the longshore bar in a specific period, wherein the standard curve is determined according to the hydrodynamic process of forming the longshore bar and lithofacies codes; the thickness of the longshore bar in the specific period is calculated; decompaction correction is conducted on the thickness of the longshore bar in the specific period, and the original thickness of the longshore bar in the specific period is obtained. Support is provided for obtaining of accurate ancient wind power existing when the longshore bar of the ancient lake forms.

The invention provides a method and device for conducting reservoir prediction through correction acoustic well logging curves. The method comprises steps of collecting well bypass materials, acoustic well logging curves and original density curves; determining an object function in accordance with well bypass materials, acoustic well logging curves and original density curves; collecting original natural potential curves or original natural gamma curves; determining a new object function in accordance with original natural potential curves or original natural gamma curves, original longitudinal wave velocity curves, original density curves and well bypass materials; setting the annealing temperature; determining corrected acoustic well logging curves in accordance with the corrected object target; and conducting reservoir prediction in accordance with corrected acoustic well logging curves. By the aid of the simulated annealing algorithm, the correction is conducted through acoustic well logging curves, synthetic records which are matched with well bypass are obtained, the important basic data are provided for multiplicity reduction and inversion accuracy improvement of sequential model inversion, and the accuracy of the reservoir prediction is improved further.

The invention provides a lithium ion battery positive material, a lithium ion battery positive electrode containing the positive material, and a battery containing the positive material. The positive material comprises a lithium iron phosphate positive active material and iron phosphate, and the primary particle size of the iron phosphate is not lower than 20mum. The over-discharge resistance capability of the battery made of the positive material comprising large-granule iron phosphate and the lithium iron phosphate positive active material is excellent; and after cells made in the invention discharge to 2.0V, the cells continuously discharge to near 0V, the decrease trend of a positive electrode potential curve tends to stability, the rise of a negative electrode potential curve is not too high (generally not higher than 1.5V), and the above two potential curves become closer or intersect at 0V. Over-discharge is prevented, the safety of the monomer cells is guaranteed, and the low-potential-energy or uncharged safe transport is realized.

The invention discloses a model generation method and device, and a lithology identification method and device. The model generation method comprises the steps of obtaining a training data set, wherein the training data set comprises multiple groups of instances, each group of instances comprises at least one piece of logging data and a data label, the at least one piece of logging data comprisesany one or more of a natural gamma curve, a natural potential curve, resistivity and a borehole diameter of the target area, and the data label is used for labeling lithology of the at least one pieceof logging data corresponding to different stratum depths; training a pre-constructed model by using the training data set to obtain a trained model, wherein the trained model is used for identifyinglithology of different stratum depths of the to-be-detected area. High automation of data processing and intellectualization of lithology identification can be achieved, the lithology identificationspeed and precision are improved, the labor intensity of interpreters is relieved, and the requirements for practical experience and professional technical knowledge of the interpreters are lowered.

The utility model provides a constant energy charging method for the lead-acid battery and a related charger, which converts the AC voltage into the DC voltage, and then into a lower voltage which is adapted with the charging voltage of the battery, the battery is charged in a manner of controlled intermittent impulse and constant energy. The control process of the constant energy is that: the charging current and the voltage of the battery is detected and analyzed, and then the charging potential is changed automatically according to the normal potential curve for the electrochemical reaction of the charged battery. The utility model has the advantages that implementing the automatically self adaptive control of the charging process with a simple circuit and low cost, reducing the mechanical stress from the twinkling fluctuation on the charging voltage, preventing the plates of the battery from being damaged, and prolonging the service life of the lead-acid battery significantly.

The invention provides a fluvial facies log facies rapid interpretation method and a fluvial facies three-dimensional sedimentary facies model deterministic modeling method. The fluvial facies three-dimensional sedimentary facies model deterministic modeling method comprises the steps of based on single layer interpretation data of each well, firstly performing log facies identification by using thickness and oil bearing property data and then performing log facies rapid correction based on the shape, amplitude and top/bottom contact relations of a natural gamma or natural potential curve of each single layer; by using the synthetic seismogram calibration technology, determining the seismic horizon corresponding to each single layer and extracting the corresponding root mean square attributes in a certain time window of the seismic horizons; by using the obtained log facies of each single layer and the corresponding root mean square attribute of each single layer, drawing a fluvial facies sedimentary facies map; inputting the sedimentary facies boundaries of fluvial facies river channels in the digital sedimentary facies map into geologic modeling software and establishing a three-dimensional sedimentary facies model by directly using the assignment method. The log facies interpretation is more efficient and rapid and sedimentary facies maps are more accurate; nondeterminacy of sedimentary facies models caused by random modeling is prevented; sedimentary facies models established by using the method can be used for constraining three-dimensional geologic model modeling such as porosity and permeability.

The invention discloses a fitting method of open circuit potential curves of electrode materials for lithium ion batteries. The fitting method of open circuit potential curves of electrode materials for lithium ion batteries includes the following steps that (1) a hyperbolic tangent function y = tanh (x) and a exponential function y = exp(x) is selected as the basic form of a open circuit potential curve fitting mathematical function; (2) the stepwise fitting process of the open circuit potential curve is started and the turning section of each platform is fitted into the form of hyperbolic tangent function and the sharp change section of each voltage is fitted into the form of exponential function; (3) the hyperbolic tangent function and the exponential function are summed up and a total fitting function and its total fitting curve are obtained, and the total fitting curve is subtracted with the target open circuit potential curve and a fitting error curve is gotten; (4) the fitting error curve is fitted again by using the hyperbolic tangent and the exponential function, so as to optimize the fitting result and reduce the fitting error until satisfying the demand of fitting precision. The fitting open circuit potential curves has the advantages of making the function more accurate and making the simulation effect more effective.

The invention discloses a continental clastic rock four-phase-in-one depositional microfacies discrimination method comprising the following steps: A, using earthquake data to determine a stratum reflection structure; B, using a nature potential curve to calculate logging curve forms; C, using rock core data to analyze bedding structures; D, using lamina data to determine a granularity combinationform; E, combining earthquake, logging, rock core and lamina information so as to identify depositional microfacies. The method can combine the earthquake, logging, rock core and lamina information to identify depositional microfacies; the method gradually increase the geology resolutions from macroscopic to microscopic, thus making up limits of using single data to identify depositional microfacies, more accurately identify the depositional microfacies, and providing technical supports for oil gas exploration.

The invention relates to a synthetic focusing method capable of inducing polarization well logging. According to the synthetic focusing method, nine annular electrodes are embedded in a columniform insulating rod to form an electrode system, wherein two pairs of monitor electrodes and two pairs of shielding electrodes are symmetrically arranged with a main electrode in the center; the electrodes are short-circuit mutually; a well logging is divided into a plurality of split fields to supply power separately, and corresponding split field inducing polarization potential of the split fields and a secondary potential attenuation curve after power-off are recorded; split field secondary potential is equivalent to the split field inducing polarization potential to obtain an inducing polarization potential curve during power supplying of the split field; and then polarization total field potential is synthesized by means of an electric field superposition principle and equipotential focusing synthetic conditions to obtain the attenuation curve of primary potential, inducing polarization total field potential and the secondary potential, a specific resistance and polarizability well logging curve after focusing. The synthetic focusing method has the advantages that the detection depth of the method reaches 2.4m, while the layering capability reaches 0.5m; and meanwhile, the method can reduce influences on inducing polarization well logging caused by boreholes, wall rocks and invaded zones, thereby increasing both the layering capability and measuring precision.

The invention relates to a grounding resistance short-distance measurement method and system with a compensation correction function and belongs to the technical field of resistance measurement. The system comprises an alternating-current signal source I, an ampere meter I, a voltmeter I, an alternating-current signal source II, an ampere meter II, a voltmeter II, a current electrode, an auxiliarycurrent electrode and a double-pole double-throw switch; the alternating-current signal source I is connected in series with the ampere meter I, and then the alternating-current signal source I and the ampere meter I are connected in parallel with the voltmeter I, so that a circuit I is formed; the alternating-current signal source II is connected in series with the ampere meter II, and then thealternating-current signal source II and the ampere meter II are connected in parallel with the voltmeter II, so that a circuit II is formed; the circuit I and the circuit II are connected through thedouble-pole double-throw switch; the ampere meter I and the voltmeter I are connected with the current electrode; and the ampere meter II and the voltmeter II are connected with the auxiliary currentelectrode. When the grounding resistance of a grounding grid is measured, the problems of long paying-off distance, high safety risk and large working difficulty of a conventional long-distance method are effectively overcome. The ground potential curve superposition curves of two grounding bodies into which reverse current is injected is corrected, so that measurement precision is improved.

A method and system for constructing logging parameters reflecting reservoir productivity are disclosed and the method comprises the following steps of 1) setting left and right scales of a natural gamma curve and a natural potential curve on a log curve for a target reservoir segment; 2) calculating an overlap difference ci of each depth point i in the target reservoir segment; and 3) accumulating the porosity ap of the target reservoir segment when ci is less than c0. The invention, aiming at the difficulty of logging evaluation productivity, designs a method for constructing parameters capable of reflecting reservoir productivity by using the natural gamma, natural potential and logging interpretation porosity data, and is simple in process, easy to operate and good in practical application effect.

The invention provides a hard electrode combined logging instrument for logging a drill well. The logging instrument comprises a current-return electrode, an emission electrode and an electronic circuit; the logging instrument is capable of realizing one-time well descending, thus being capable of performing the measurement on data of an electrode system; the electronic circuit comprises a power supply circuit, a measurement amplification circuit, a scale circuit, a power control circuit and a communication interface circuit. The logging instrument provided by the invention has the beneficial effect of being capable of measuring a conventional curve required by a user, and also measuring a potential curve and a gradient curve simultaneously by one-time well descending under the control of a telemetry instrument.

The invention discloses a method and a system for detecting the position of a drilled hole in a roadway. The method comprises the following steps that a first power supply electrode is arranged in theposition, exposed to the ground, of the drilled hole, and a second power supply electrode is buried in the ground surface with a first preset distance from the drilled hole, wherein the first power supply electrode is used for supplying power to the drilled hole; a first measurement electrode and a second measurement electrode are arranged in the roadway, wherein the first measurement electrode is used for measuring potential values in different positions in the roadway, and the second measurement electrode serves as an infinite electrode; the potential values of a plurality of position points in the roadway are measured, and a potential curve is generated according to the potential values of the position points and the positions of the position points in a roadway direction; and the position, corresponding to the maximum value of the potential values in the potential curve, in the roadway direction is determined, so that the corresponding position of the drilled hole in the roadway direction is determined. According to the method, the position of the drilled hole in front can be detected in the roadway, so that the convenience is provided for underground coal mine construction.

A battery characteristic simulating control method is characterized in that a battery model is equivalent to a voltage source series internal resistance form, and the battery simulating output voltageis the sum of the battery internal potential and the internal resistance voltage drop. According to the actually measured charge-discharge data of the battery, a curve of the charge-discharge state of charge and the battery terminal voltage is obtained. Based on the curve, a battery internal potential curve is fitted, wherein the horizontal and vertical coordinates of the curve are the state of charge and the internal potential of the battery respectively. During control, the battery capacity is determined by the integration of the real-time current of the battery with time, the real-time state of charge of the battery is calculated, and the internal potential of the battery is obtained by looking up a table. The equivalent internal resistance of the battery is obtained by dividing the charge-discharge voltage drop corresponding to the same state of charge by the double battery current. The simulating output voltage of the battery is given as the DC voltage of a control circuit, and closed-loop control is performed in cooperation with the real-time port voltage. Finally the output DC bus voltage of the control circuit is equal to the real-time port voltage of the simulated battery.