32 results about "Spontaneous potential" patented technology

A method of measuring characteristics of a geologic formation, using the time, energy and spatial spectra of gamma rays induced by an accelerator, which allows (i) the measurement of the photoelectric absorption (Pe) factor of the formation using a gamma-ray spectrum detected from gamma rays induced in the formation, (ii) the calculation of a neutron porosity of the formation using the gamma-ray spectrum, and (iii) the determination of a bulk density of the formation using the spectroscopic measurements. The Pe factor may be inferred by directly mapping the spectroscopic measurements. The porosity may be calculated by relating the gamma-ray spectrum to a hydrogen content of the formation. The density may be determined by computing a gamma diffusion length of the formation based on the gamma-ray spectrum. In addition to these measurements, the resistivity of the formation and its spontaneous potential may also be measured using an electromagnetic induction system.

Disclosed is a method for calculating a shale content of high and low gamma interaction reservoirs. The method includes step one, influencing correction by means of a logging information environment; step two, calculating the shale content by means of spontaneous potential logging; step three, calculating the shale content by means of resistivity logging; step four, calculating the shale content by means of a compensated neutron-density method; step five, calculating the shale content by means of natural gamma-ray logging; step six, determining the shale content using a minimum value method on the basis of the shale contents calculated by using the previous four methods. According to the method for calculating the shale content of the high and low gamma interaction reservoirs, shale content calculations of a high gamma reservoir and a conventional reservoir are organically integrated, a calculated shale content curve basically overlaps with a shale content analyzed and tested by a lab, and accuracy of calculation of the shale content is greatly increased.

The invention relates to a fracture filling solute transport monitoring test device and method, which are suitable for monitoring and identifying fracture filling medium solute transport. The fracturefilling solute transport monitoring test device comprises a fracture filling model and a monitoring device, wherein the fracture filling model consists of a model main body, a water supply / outlet andflow stabilizing device and a monitoring device. A parallel smooth fracture model main body is filled with river sand to simulate fracture filling, Ag-AgCl electrodes are distributed on the fractures, and the dynamic change of fracture filling spontaneous potential parameters caused by solute transport is detected by the monitoring device to analyze the solute transport state in invisible fractures, so that a basis is laid for monitoring, evaluation and prediction of solute pollution in underground media. The method has the characteristics of high efficiency, convenience and high operability.

The invention provides a method for automatic calculation of a lithological curve by employing a logging curve in geophysical exploration, and belongs to the field of petroleum geophysical exploration. The method includes: (1) loading the logging curve, comprising curves of gamma, spontaneous potential, resistivity, neutron, and neutron lifetime; (2) respectively correcting the five curves, and obtaining corrected curves; (3) respectively reading the maximum GMAXi and the minimum GMINi of the five curves from the corrected curves; (4) calculating the curve shale content relative value Shi; (5) calculating the shale content; (6) calculating the final shale content Vsh; (7) calculating the lithological curve with the combination of the final shale content Vsh obtained by the step (6) and a measured density curve Density; and (8) outputting the lithological curve.

The invention discloses a method for detecting the pore pressure of a high pressure saltwater layer by using log information. In the method, the pore pressure of the high pressure saltwater layer is detected according to measured log information through a relational curve between sedimentary characteristic-based interval transit time, spontaneous potential and natural gamma log response characteristic and the pore pressure of the high pressure saltwater layer, so that scientific basis is provided for determining the density of safe drilling liquid during well design, and occurrence of complexand other terrible accidents in underground of the saltwater layer during the construction can be effectively prevented.

The inkjet head for discharging a water-based ink for inkjet recording is disclosed, the inkjet head including two or more types of metal members used at portions to be brought in contact with the water-based ink, wherein at least two of the two or more types of the metal members are electrically connected, and the two or more types of the electrically connected metal members have spontaneous potentials each of which is measured with a reference electrode Ag / AgCl in the water-based ink and which provide an absolute value of a maximum difference therebetween, the absolute value being not more than 60 mV. An ink jet head is provided, in which any corrosion of a metal member is suppressed.

The invention discloses an evoked potential extracting method based on random gradient adaptive filtering. Potential signals repeatedly stimulated are collected through multiple potential measuring systems and comprise mixed signals of spontaneous potentials, spontaneous potentials obtained after stimulation is applied, and evoked potentials, all the mixed signals are superposed for averaging, and an average mixed signal is obtained; the stimulation application time serves as a starting point of counting of extracting time, a section of signal with the length being N is extracted from the average mixed signal to serve as a first main signal, a signal obtained by delaying the first main signal by one time interval serves as a first reference signal, the first main signal and the first reference signal are input into LMS adaptive filters, and first output signals of all channels are obtained; then, the first output signals serve as second reference signals, a section of spontaneous potential with the length being N serves as a second main signal, the second reference signals and the second main signal are put into the LMS adaptive filters, and evoked potentials of all the channels are obtained. By means of the evoked potential extracting method, the evoked potentials high in quality are obtained under the background that adequate priori knowledge is not available, and the number of repeated stimulation times is effective reduced.

An embodiment of the invention provides a method for acquiring a logging density curve. The method includes the specific steps of acquiring a spontaneous potential curve of a target well and an interval transit time curve thereof; subjecting the spontaneous potential curve and the interval transit time curve to curve fusion computation on the basis of a wavelet transform Mallat algorithm so as to obtain a density coefficient curve of the target well; calculating density data of an area where the target well locates and the density coefficient curve to obtain the density curve of the target well. The method according to the embodiment has the advantages that lithological and physical characteristics contained in the spontaneous potential curve and the interval transit time curve are effectively extracted and are effectively fused by means of wavelet reconstruction based information fusion, and the logging density curve obtained by calculation is higher in precision and is more approximate to an actual density curve.

The invention discloses a goaf hysteresis water inrush early warning system based on a natural potential method and an application method thereof, belonging to the field of coal mine safety technology and engineering. It includes a data acquisition device, a data processing device, an early warning device and a natural potential monitoring device. The natural potential monitoring device includes a reference electrode and at least one measuring electrode. Each measuring electrode is correspondingly connected to a data acquisition card. The data acquisition card is used to measure The potential signal collected by the electrodes is temporarily stored, and a protection device is installed above each data acquisition card; the natural potential in the goaf is monitored in real time through the natural potential monitoring device. The invention can realize the real-time monitoring of the natural potential of the goaf, through data collection and processing, can monitor the groundwater flowing potential signal of the goaf in real time, can effectively warn the delayed water inrush in the goaf, and effectively reduce or prevent the goaf Potential safety hazard of delayed water inrush.

Disclosed is a method for calculating a shale content of high and low gamma interaction reservoirs. The method includes step one, influencing correction by means of a logging information environment; step two, calculating the shale content by means of spontaneous potential logging; step three, calculating the shale content by means of resistivity logging; step four, calculating the shale content by means of a compensated neutron-density method; step five, calculating the shale content by means of natural gamma-ray logging; step six, determining the shale content using a minimum value method on the basis of the shale contents calculated by using the previous four methods. According to the method for calculating the shale content of the high and low gamma interaction reservoirs, shale content calculations of a high gamma reservoir and a conventional reservoir are organically integrated, a calculated shale content curve basically overlaps with a shale content analyzed and tested by a lab, and accuracy of calculation of the shale content is greatly increased.

The wall of each heat exchange tube of a condenser for a car air conditioner is composed of a core material layer, a first brazing material layer covering the outer surface of the core material layer, and a second brazing material layer covering the inner surface of the core material layer. A Zn diffused layer is formed in an outer surface layer portion of the core material layer. The deepest portion of the Zn diffused layer is located at a position 70 to 100 μm deep from an outermost surface of the wall. The Zn concentration of the outermost surface of the wall of the heat exchange tube is 0.55 mass % or higher. The Zn diffused layer includes a high potential portion whose spontaneous potential is at least 41 mV higher than the spontaneous potential at the boundary between the core material layer and the first brazing material layer.

The invention discloses a brain evoked potential signal acquiring method. The brain evoked potential signal acquiring method comprises the following steps: S1, stimulating a brain by a frequency, acquiring waveforms of brain evoked potential signals stimulated every time, and simultaneously acquiring waveforms of randomly generated brain spontaneous potential signals, wherein brain spontaneous potential signals acquired at different times are different; S2, judging whether the wave amplitude of the waveform of an optional brain evoked potential signal in the waveforms of the brain evoked potential signals acquired in the time period is greater than a first set threshold value or not, if the wave amplitude of the waveform of the optional brain evoked potential signal in the waveforms of the brain evoked potential signals acquired in the time period is greater than the first set threshold value, entering the step S3, and if the wave amplitude of the waveform of the optional brain evoked potential signal in the waveforms of the brain evoked potential signals acquired in the time period is not greater than the first set threshold value, entering the step S4; S3, removing waveforms of brain evoked potential signals; S4, successively superposing the brain spontaneous potential signals and the brain evoked potential signals in the time period; and S5, displaying an oscillogram of the brain evoked potential signals. When the waveforms of the brain evoked potential signals are acquired, acquired interference noises, namely the waveforms of the brain evoked potential signals, can be filtered out effectively.

The invention discloses a soft tissue ache detecting and treating device. The device mainly comprises two parts, i.e. a detecting module and a treating module, wherein the detecting module comprises a patch electrode, a pin type electrode, an electrode clamp, an electrode connecting line, an electrode line connector, a detecting main board, an LCD (liquid crystal display) color screen, a waveform adjusting plate, a waveform adjusting knob, a waveform adjusting key and a detecting module power supply switch; the treating module comprises a treating main board, a treating control plate, a treating output plate, a temperature-control pin connecting line and a temperature-control pin. The pin type electrode detects that an electric signal enters a filtration and amplification circuit of the detecting main board through the electrode connecting line, the processed electric signal enters a single chip computer to be further processed, an acquired spontaneous potential which is processed is transmitted to the screen to be subjected to oscillography, a treating temperature parameter on the treating control plate is adjusted, a treating mode switch is turned on, the single chip computer is controlled to output low frequency PWM (Pulse Width Modulation) of, and then the connection / disconnection of a heating and driving control circuit of the temperature-control pin is controlled.

As an aluminum alloy for a microporous hollow material, an aluminum alloy is provided which contains Cu, which is an element having poor grain boundary corrosion resistance, in a reduced amount, can have a nobly kept spontaneous potential, contains a transition metal that does not adversely affect extrudability of the material, and has excellent corrosion resistance and extrudability. An aluminum alloy having a chemical composition comprising, in mass%, 0.05 to 0.20% of Fe, 0.10% or less of Si, 0.15 to 0.32% of Cu, 0.08 to 0.15% of Mn, 0.05% or less of Zr, 0.06 to 0.15% of Ti, 0.03% or less of Cr, and a remainder made up by Al and unavoidable impurities, wherein the amount of a gas in an alloy billet is 0.25 cc / 100 g or less; and a method for producing an aluminum alloy, comprising producing a DC cast billet having the above-mentioned chemical composition by a melt treatment employing proper casting conditions so that the content of a gas in the DC cast billet can be reduced to 0.25 cc / 100 g or less, and then subjecting the DC cast billet to a soaking treatment, wherein the soaking treatment comprises heating the DC cast billet to 550 to 590 DEG C at a rate of 80 DEG C / hour or less, then holding the heated DC cast billet at that temperature for 0.5 to 6 hours, and then holding the resultant product at a temperature falling within the range from 450 to 350 DEG C for 0.5 to 1 hour or cooling the resultant product to 200 DEG C or lower at a cooling rate of 50 DEG C / hour.

The invention discloses a submarine spontaneous potential observation method with transient electromagnetic double trailers and an electric interference correction method. The double trailers of a transient electromagnetic instrument are connected through a relay cable. An electrode cable is bound to the relay cable. A plurality of AgCl non-polarized electrode pairs are arranged on the electrode cable in sequence, and each group of electrode distance is identical. The weak positive buoyancy of the double trailers is applied to flatten the electrode cable to form horizontal observation. The electrode distance is enabled to be constant in the process of observing the spontaneous potential by horizontal towing on the sea floor, the false abnormality of the spontaneous potential caused by the change of the electrode distance can be eliminated, location is performed by the ultra-short baseline and the attitude sensor and the horizontal deflection angle is recorded and the electrode cable is maintained to be level during the towing process. Secondly, compared with the conductivity anomaly detected by the transient electromagnetic instrument, the potential anomaly caused by the bottom current is eliminated. In addition, the morphological method is applied to remove the interference of transient electromagnetic signals, and the filtering effect is improved. The guarantee can be provided for the more accurate observation of the spontaneous potential generated by the seafloor ore body.

Heat exchange tubes of a heat exchanger are formed of an alloy containing Mn (0.2 to 0.3 mass %), Cu (0.1 mass % or less), and Fe (0.2 mass % or less), the balance being Al and unavoidable impurities. A Zn diffused layer is formed in an outer surface layer portion of the peripheral wall of each heat exchange tube. T≦200, 0.57≦A≦1.5, D / T≦0.55, and 0.0055≦A / D≦0.025 are satisfied, where T is the thickness [μm] of the peripheral wall of the heat exchange tube, A is the Zn concentration [mass %] at the outermost surface of the outer surface layer portion, and D is the maximum depth [μm] of the Zn diffused layer. The spontaneous potential of the Zn diffused layer is lower than that of a portion of the peripheral wall located on the inner side of the Zn diffused layer.

A method for surveying and prospecting the blind deposit through the solid tide piezoeffect and natural potential, its steps are as below: a) in the survey area, arrange the non-polarizable electrode according to the gridding method, the buried depth and requirements must be similar with that for natural potential survey method; b) fulfill the twice potential measurement for these arranged electrodes, in which, one measurement is carried out at high solid tide, the other is carried out at the low solid tide; c) calculate the solid tide piezoelectric abnormal constant according to the measured potential results; at the section with blind deposit, the difference between the high solid tide potential and low solid tide potential is very high; at the section without blind deposit, the difference between the high solid tide potential and low solid tide potential is very low. The invention utilizes the piezoeffect principle, combine the piezoeffect caused by the solid tide with the natural potential measurement, it is an effective method for direct surveying the quartz-vein gold and other deposits (with piezoeffect).

The invention discloses a well-logging instrument and a well-logging base nose thereof. The well-logging instrument integrates the functions of a spontaneous potential well-logging instrument, a mud resistivity well-logging instrument and the well-logging base nose, so that the equipment integration level is improved, the well-logging instrument is structurally simplified, and the overall length of the well-logging instrument is decreased. The well-logging base nose comprises an upper joint and a shock absorption portion. The upper joint is used for connecting an upper component of the well-logging instrument. The shock absorption portion gradually contracting from top to bottom is connected on the lower portion of the well-logging instrument and comprises an emitting electrode, an integrated electrode, a first measuring electrode and a second measuring electrode which are insulated mutually, wherein the integrated electrode integrates a spontaneous potential electrode and a receiving electrode, the receiving electrode and the emitting electrode form a measuring electric field, the first measuring electrode and the second measuring electrode are positioned in the measuring electric field so as to obtain mud resistivity according to own resistance, and the spontaneous potential electrode is connected with a ground electrode so as to detect spontaneous potential.

The inkjet head for discharging a water-based ink for inkjet recording is disclosed, the inkjet head including two or more types of metal members used at portions to be brought in contact with the water-based ink, wherein at least two of the two or more types of the metal members are electrically connected, and the two or more types of the electrically connected metal members have spontaneous potentials each of which is measured with a reference electrode Ag / AgCl in the water-based ink and which provide an absolute value of a maximum difference therebetween, the absolute value being not more than 60 mV. An ink jet head is provided, in which any corrosion of a metal member is suppressed.

The invention belongs to the technical fields of geothermal, geophysical electrical exploration and engineering and environmental geophysics research, and relates to a permeability estimation method based on natural potential signal inversion. Including: S1 obtains the underground current density distribution by establishing the hydraulic and electrical coupling model to simulate the forward and inversion response of the underground natural potential signal, uses the collected conductivity constraints to restore the underground potential field, and obtains the permeability distribution according to the potential field; The high-density resistivity data obtained in the field is inverted and processed to obtain the conductivity distribution, combined with the self-potential signal for forward and inversion calculation to restore the underground natural potential field, and estimate the underground permeability distribution information. Compared with the traditional intrusive method, the non-destructive detection technology is used to observe the multi-dimensional (time-space) multi-response parameter information of groundwater in the effective geothermal target area. Coupling multiple electrical parameters to calculate and restore the distribution of permeability, skip the steps of difficult sampling and difficult measurement in traditional problems.

The present invention provides a heat exchanger capable of securing required corrosion resistance while reducing the thickness of heat exchange tubes. The tube wall (30) of the heat exchange tube of the condenser consists of a core material layer (31), a first solder layer (32) covering the outer surface of the core material layer (31), and an inner layer covering the core material layer (31). The second solder layer (33) on the surface is formed. A Zn diffusion layer (34) is formed on the outer surface layer portion of the core material layer (31). The deepest part of the Zn diffusion layer (34) is located at a depth of 70 to 100 μm from the outermost surface of the tube wall (30) of the heat exchange tube. The Zn concentration of the outermost surface of the tube wall (30) of the heat exchange tube is 0.55% by mass or more, and there is a boundary between the core material layer (31) and the first solder layer (32) in the Zn diffusion layer (34). Portion (35) is a high potential portion in which the spontaneous potential is 41 mV or more higher.

The invention discloses an evoked potential extracting method based on random gradient adaptive filtering. Potential signals repeatedly stimulated are collected through multiple potential measuring systems and comprise mixed signals of spontaneous potentials, spontaneous potentials obtained after stimulation is applied, and evoked potentials, all the mixed signals are superposed for averaging, and an average mixed signal is obtained; the stimulation application time serves as a starting point of counting of extracting time, a section of signal with the length being N is extracted from the average mixed signal to serve as a first main signal, a signal obtained by delaying the first main signal by one time interval serves as a first reference signal, the first main signal and the first reference signal are input into LMS adaptive filters, and first output signals of all channels are obtained; then, the first output signals serve as second reference signals, a section of spontaneous potential with the length being N serves as a second main signal, the second reference signals and the second main signal are put into the LMS adaptive filters, and evoked potentials of all the channels are obtained. By means of the evoked potential extracting method, the evoked potentials high in quality are obtained under the background that adequate priori knowledge is not available, and the number of repeated stimulation times is effective reduced.

The invention discloses a ground spontaneous potential data acquiring and processing method based on a small circulation plane multi-electrode synchronization base point. The method comprises the following steps that: a position which has smooth terrain and smaller human interference is selected near a work area to preset a base point, electrodes are arranged by a method that a deep-layer electrode and a shallow-layer electrode are longitudinally arranged; two adjacent measuring lines are divided into a plurality of sections according to the situation of the work area, a plurality of small cycles are formed at a certain section; general measuring point electrodes are arranged on a plane, each measuring point is provided with five electrodes; and a digital multi-channel observation instrument is utilized to synchronously observe a spontaneous potential time sequence of the five electrodes, a spontaneous potential time sequence of the base point is utilized to correct the spontaneous potential time sequences of general measuring points, five spontaneous potential values of each general measuring point can form gradients in three directions and obtain ten gradient values, thereby effectively reducing or partially eliminating the interference of various noises to obtain a reliable and steady spontaneous electric field.

An apparatus for measuring spontaneous potential (SP) of an earth formation includes a downhole tool that is moveable within a borehole by conveyance means. A portion of the conveyance means produces a reference DC potential signal. The tool includes a measurement electrode that produces a potential signal representative of SP of the earth formation. The tool also includes circuitry that measures a differential DC potential signal between the potential signal produced by the measurement electrode and the reference DC potential signal. SP data that characterizes SP of the earth formation is generated based upon the output of such circuitry. In one embodiment for a while-drilling tool, the conveyance means and tool are realized by a drill string with an insulative sleeve that supports the measurement electrode and electrically isolates the measurement electrode from the drill string. Other embodiments for while-drilling tools and tools for tough logging conditions are also described.

The invention discloses a method for detecting the pore pressure of a high pressure saltwater layer by using log information. In the method, the pore pressure of the high pressure saltwater layer is detected according to measured log information through a relational curve between sedimentary characteristic-based interval transit time, spontaneous potential and natural gamma log response characteristic and the pore pressure of the high pressure saltwater layer, so that scientific basis is provided for determining the density of safe drilling liquid during well design, and occurrence of complexand other terrible accidents in underground of the saltwater layer during the construction can be effectively prevented.

An embodiment of the invention provides a method for acquiring a logging density curve. The method includes the specific steps of acquiring a spontaneous potential curve of a target well and an interval transit time curve thereof; subjecting the spontaneous potential curve and the interval transit time curve to curve fusion computation on the basis of a wavelet transform Mallat algorithm so as to obtain a density coefficient curve of the target well; calculating density data of an area where the target well locates and the density coefficient curve to obtain the density curve of the target well. The method according to the embodiment has the advantages that lithological and physical characteristics contained in the spontaneous potential curve and the interval transit time curve are effectively extracted and are effectively fused by means of wavelet reconstruction based information fusion, and the logging density curve obtained by calculation is higher in precision and is more approximate to an actual density curve.

A method for surveying and prospecting the blind deposit through the solid tide piezoeffect and natural potential, its steps are as below: a) in the survey area, arrange the non-polarizable electrode according to the gridding method, the buried depth and requirements must be similar with that for natural potential survey method; b) fulfill the twice potential measurement for these arranged electrodes, in which, one measurement is carried out at high solid tide, the other is carried out at the low solid tide; c) calculate the solid tide piezoelectric abnormal constant according to the measured potential results; at the section with blind deposit, the difference between the high solid tide potential and low solid tide potential is very high; at the section without blind deposit, the difference between the high solid tide potential and low solid tide potential is very low. The invention utilizes the piezoeffect principle, combine the piezoeffect caused by the solid tide with the natural potential measurement, it is an effective method for direct surveying the quartz-vein gold and other deposits (with piezoeffect).