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33 results about "Invasion depth" patented technology
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Visual simulation shale micro-crack plugging capacity test system and method
ActiveCN103485762AIntuitive visual macro analysisImprove general applicabilityConstructionsBorehole/well accessoriesMicroscopic observationMicroscopic scale
The invention relates to a visual simulation shale micro-crack plugging capacity test system and a visual simulation shale micro-crack plugging capacity test method. Displacement evaluation experiment is performed on a single or combined micro-crack rock sample by a solution or a drilling fluid which contains the plugging agents with different concentrations and different types at different experiment conditions, such as pressure differences and times, indexes, such as the invasion depth, are compared, the formation conditions of inner mud cakes in drilling are directly described, and microscopic observation and analysis are performed on percolation substances invade into the micro-cracks by utilizing amplification imaging instruments, such as a high-definition microscope, so that the plugging mechanisms and the effects of various drilling fluid plugging agents and drilling fluids are analyzed and researched intuitively and microscopically, a proper drilling fluid plugging agent is selected preferably, a drilling fluid system formula is optimized, the problem about the experimental conditions that the visual simulation evaluation cannot be performed on shale micro-crack plugging in the past is solved, and a new evaluation experimental research means is provided for related research and production in the technical field of fractured shale strata borehole wall stability in petroleum engineering.
Owner:CHINA PETROLEUM & CHEM CORP +1
Endoscope system
InactiveUS20120190922A1Accurate diagnosisAccurate observationImage enhancementImage analysisImaging conditionPattern matching
An endoscope system is provided in which blood vessels (pits) are extracted from an image captured by an endoscope to perform pattern matching with vascular patterns (pit patterns) associated with the cancer invasion depth and operations such as enhanced display of blood vessels, suggestion of preferred imaging conditions and display for diagnosis support are performed based on the matching result. The endoscope system enables even a less-experienced doctor to correctly diagnose the cancer invasion depth.
Owner:FUJIFILM CORP
Composite type leakage plugging agent for oil-based drilling fluid and preparation method thereof
ActiveCN105368409AGood lipophilic dispersibilityGood dispersionDrilling compositionReduction rateFiber
The invention provides a composite type leakage plugging agent for an oil-based drilling fluid. The composite type leakage plugging agent for the oil-based drilling fluid comprises the raw materials by the weight percentage: 20%-50% of a leakage plugging material, 0.5%-2% of a fiber material, 5%-20% of an oil swelling material, 20%-40% of a lipophilic superfine particle material, and 10%-20% of a lipophilic flaky material. The leakage plugging agent mainly aims at leakage prevention and plugging requirements of permeable formation and fractured leakage formation encountered by an oil-based drilling fluid system during drilling, and the compressive strength can reach 7 MPa for 5 mm cracks; in sand bed evaluation tests, the invasion depth reduction rate is more than 90%. The composite type leakage plugging agent can significantly improve the leakage plugging success rate of the oil-based drilling fluid and enhances the formation bearing ability.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Bearing strength experiment instrument of high-temperature high-pressure mud cake plugging
ActiveCN101109739AEvaluation of closureThe experimental effect is intuitiveBorehole/well accessoriesMaterial analysisSlurryData treatment
The invention provides a tester for the bearing and plugging strength of a mud cake under high temperature and high pressure, which can simulate the static conditions in a well and test the invasion depth of slurry filter liquid, bearing strength of mud cake, plugging and bearing strength against cracks in drilling for oil (gas) wells. The tester essentially comprises a mud-cake performance evaluation and test vessel assembly, a pressure pipe system, a temperature control system, a displacement record system, an automatic cleaning system and a computer data processing system. The tester allows all-sided simulation of the temperature, pressure and stratum features (seepage) under a well, determination the plugging and bearing strength of mud cakes, optimization of drilling fluid, rapid and safe drilling, therefore the tester is of a very wide application prospect.
Owner:CHINA PETROLEUM & CHEM CORP +1
Multifunctional dynamic pollution evaluation device of coalbed drilling fluid
InactiveCN101798917AOvercome the shortcomings of doing it aloneAvoid stress effectsSurveyPermeability/surface area analysisDifferential pressureEngineering
The invention relates to a multifunctional dynamic pollution evaluation device of coalbed drilling fluid, belonging to the technical field of damage evaluation of coalbed methane drilling fluid. The multifunctional dynamic pollution evaluation device comprises a gas booster pump, a triaxial stress coal core gripper, a measuring axial-loading pump, a gas mass flow meter, a computer acquisition board, a mud container, an oven, a precise advection pump, and the like; wherein the gas booster pump is arranged at the left side of the oven; a gas storage tank, the precise advection pump, the measuring axial-loading pump and the gas mass flow meter are arranged at the lower part of the oven; and the triaxial stress coal core gripper and the mud container are arranged in a working space of the oven. The evaluation device can not only simulate the invasion, the invasion depth and the invasion degree of the drilling fluid to a coal bed under the condition of coalbed true triaxial stress, but also simulates the dynamic pollution process of mud in positive differential pressure, negative differential pressure and balanced drilling process and ensures that the coalbed pollution process is integrated with the percolation test process. The invention solves the problem that the conventional evaluation device can not load different axial loads on three axial directions and has the advantages of convenient operation and standardized experimental data.
Owner:CNPC DRILLING RES INST +1
Method for identifying attitude of stratum and inversion method of stratum parameters
ActiveCN107218033AFit closelyStratum occurrence is fast and efficientBorehole/well accessoriesElectricityWell logging
The invention discloses a method for identifying attitude of a stratum and an inversion method of stratum parameters. The methods include the steps of obtaining Well-logging curves on each counter electrode of an electrical imaging device; conducting pre-hierarchy on each composite log to obtain a pre-hierarchy interface location of each Well-logging curve; successively choosing depth segments containing pre-hierarchy interfaces as reference segments, conducting a correlation contrast on the Well-logging curves on other counter electrodes to obtain an effective layer interface of each Well-logging curve; ranking the effective layer interfaces of the Well-logging curves on all counter electrodes by depth, obtaining a stratum interface and calculating attitude information. Further more, based on the stratum hierarchy, a forward model is formed by combining the information of dual laterolog; by inversion, mud invasion depth and specific resistance of invaded zones and undisturbed zones are obtained. The stratum interface extracted by the methods matches with logging images pretty well, the attitude information is more precision, and the stratum parameters obtained by inversion can achieve quantitative description of invasion features of mud.
Owner:CHINA NAT OFFSHORE OIL CORP +1
Electromagnetic propagation resistivity logging joint inversion method based on parallel computing technology
InactiveCN104895561AReduce inversion errorHigh confidence in inversion calculationBorehole/well accessoriesModel parametersElectromagnetic propagation
The invention discloses an electromagnetic propagation resistivity logging joint inversion method based on parallel computing technology. The method comprises following steps of A: loading electromagnetic propagation resistivity logging data; B: performing smooth filtering and automatic layering for logging curves; C: selecting stratum model invasion depth and invasion electrical resistivity according to curve separation degree; D: calculating electromagnetic propagation resistivity logging response of corresponding depth points of measured curved by use of the limited element method based on multinuclear parallel or GPU parallel computing technology; and E: calculating a relative error of the forward simulation response value and measured data, outputting the model value to be the inversion result if the relative error is smaller than a set threshold value, and if not, calculating variable quantity of the model, resetting stratum model parameter, and returning to the step D until outputting the reversion result according to the Marquette iterative algorithm. According to the invention, the method is quick inversion calculating speed, high in precision, suitable for server invasion of mud, and capable of providing technical support for storage layer evaluation and pollution level evaluation of the storage layer.
Owner:CHINA NAT OFFSHORE OIL CORP +1
Method and system for measuring invasion depth of drilling fluid filtrate in reservoir
The invention relates to a method and a system for measuring the invasion depth of a drilling fluid filtrate in a reservoir. The method comprises the following steps: measuring discrete filtration loss in a plurality of time segments; determining relevance between the time and the filtration loss through regression analysis; determining actual invasion volume of the drilling fluid filtrate according to the relevance between the time and the filtration loss; determining theoretical invasion volume according to drilling information; determining the invasion depth according to the actual invasion volume and the theoretical invasion volume. The system comprises a module for determining relevance between filtration loss and time, a module for determining actual invasion volume, a module for determining theoretical invasion volume and a module for determining invasion depth. The method and the system for measuring the invasion depth of the drilling fluid filtrate in the reservoir are simple and practical, and high in operability; in addition, compared with a permeability recovery value method in the prior art, the method has the advantages of excellent reproducibility and high reliability of judging results.
Owner:CHINA NAT OFFSHORE OIL CORP +1
Optical analyzer
An optical analyzer performing analysis excellent in spatial resolution and in invasion depth is provided. The analyzer includes a diagnostic light source section including a seed light source which outputs seed light, and a silica optical fiber to which seed light is input and which generates diagnostic light having a HE11 mode field pattern utilizing a nonlinear optical phenomenon, an irradiation optical system converging the diagnostic light and irradiating a measurement subject with the diagnostic light, an acquisition optical system acquiring object light generated at the measurement subject, a spectrum measurement section receiving the object light and measuring a frequency spectrum of the object light, a storage section storing information of a frequency spectrum of a known substance, and an arithmetic section calculating a correspondence between the frequency spectrum of the object light and the frequency spectrum of the known substance, and analyzing the measurement subject based on the calculation result.
Owner:SUMITOMO ELECTRIC IND LTD
Method for evaluating invasion degree and influence of mud invading into ultra-low-permeability oil layer
ActiveCN109386285AFlow fastIntrusion is commonDesign optimisation/simulationSpecial data processing applicationsMaterial balanceFracture test
The invention relates to a method for evaluating the invasion degree and influence of mud invading into an ultra-low-permeability oil layer. The method includes the steps that according to geologicallogging, experimental analysis, fracturing test mining and other data, on the basis of dynamic analysis, a seepage theory, a material balance principle and combination of dynamic analysis and static analysis, production dynamics of the ultra-low-permeability oil layer are divided into two stages including the initial production stage and the stability stage according to fracturing test mining curve features; the mud invasion degree of the ultra-low-permeability oil layer is determined according to differences of the initial fluid throughput amount of strata, and properties of the oil layer arejudged according to the fluid throughput amount of the strata and the mud invasion depth in combination with quantification of the fracturing curve features; a relationship chart between the resistivity and mud invasion depth of the oil layer is compiled to quantitatively evaluate the mud invasion influence. The invasion volume and invasion radius of a mud filtrate in the ultra-low-permeability oil layer can be determined simply, accurately and quantitatively, correspondingly the mud invasion influence and causes of the low-resistance oil layer are analyzed, the properties of the oil layer are identified and evaluated, and the causes of the low-resistance oil layer are determined.
Owner:XI'AN PETROLEUM UNIVERSITY
Method and apparatus for determining formation water saturation during drilling
Owner:SCHLUMBERGER TECH CORP
Optical analyzer
InactiveUS20090209865A1Improve spatial resolutionDiagnostics using lightRaman scatteringFrequency spectrumSilicon dioxide
An optical analyzer performing analysis excellent in spatial resolution and in invasion depth is provided. The analyzer includes a diagnostic light source section including a seed light source which outputs seed light, and a silica optical fiber to which seed light is input and which generates diagnostic light having a HE11 mode field pattern utilizing a nonlinear optical phenomenon, an irradiation optical system converging the diagnostic light and irradiating a measurement subject with the diagnostic light, an acquisition optical system acquiring object light generated at the measurement subject, a spectrum measurement section receiving the object light and measuring a frequency spectrum of the object light, a storage section storing information of a frequency spectrum of a known substance, and an arithmetic section calculating a correspondence between the frequency spectrum of the object light and the frequency spectrum of the known substance, and analyzing the measurement subject based on the calculation result.
Owner:SUMITOMO ELECTRIC IND LTD
Uterine manipulator capable of achieving accurate positioning
The invention relates to a medical instrument, in particular to a uterine manipulator capable of achieving accurate positioning. The uterine manipulator comprises a uterine lifting cup, a hollow operating rod and a guide rod, wherein the hollow operating rod is connected to the uterine lifting cup and the guide rod is arranged in an inner cavity of the operating rod and is capable of extending out of the uterine lifting cup; the uterine lifting cup is composed of two parts, namely an upper part and a lower part; the lower part is fixedly connected to the operating rod, and the lower part, in the axial direction of the peripheral wall thereof, is provided with a plurality of annular grooves which are spaced from each other; and the upper part includes a plurality of blades which are fixedly connected to the lower part and are spaced from each other in a circumferential direction. By virtue of the plurality of the grooves which are arranged on the uterine lifting cup, a doctor, in a cervical carcinoma lesion resection, can determine the length of vagina to be resected according to the positions of the corresponding grooves, so that a lesion can be accurately and completely resected; in addition, the operating rod is provided with two scales of which one is capable of judging the invasion depth of the operating rod and the other one is capable of judging the length of the guide rod extending into a uterine cavity. Therefore, the uterine manipulator disclosed by the invention can achieve accurate positioning by virtue of the uterine lifting cup, the operating rod and the guide rod.
Owner:THE THIRD XIANGYA HOSPITAL OF CENT SOUTH UNIV
Anti-collapse plugging agent, and preparation method and application thereof
InactiveCN106811182AImprove performanceGood anti-collapse effectDrilling compositionWater basedPolymer science
The invention provides an anti-collapse plugging agent, and a preparation method and application thereof. According to the preparation method of the anti-collapse plugging agent, an inorganic hard monomer is added into a water phase of polymer microspheres synthesized by reversed-phase suspension polymerization, thereby preparing the polymer-microsphere-containing anti-collapse plugging agent. The anti-collapse plugging agent provided by the invention can be directly added into a water-base drilling fluid. The particle size of the polymer microspheres in the anti-collapse plugging agent is 2-300 mu m. The anti-collapse plugging agent provided by the invention has favorable temperature resistance and favorable anti-collapse effect, and can effectively inhibit the hydrous disintegration of clay. The anti-collapse plugging agent has favorable elasticity, can effectively lower the API filter loss and sand bed invasion depth of the drilling fluid, and has favorable plugging effects on pore throats with different shapes and sizes.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Method and system for determining invasion depth of slurry filtrate
ActiveCN109989743AQuickly and accurately know the penetration depthSurveyTime informationBreakthrough time
The invention discloses a method for determining the invasion depth of slurry filtrate. The method comprises the following steps: acquiring a time and conductivity curve graph in a sampling process ofa formation fluid pump; determining oil gas breakthrough time information and pure oil gas stabilization time information of the formation fluid based on the time and conductivity curve graph; establishing a formation fluid volume model according to the oil gas breakthrough time information, the pure oil gas stabilization time information and the known set pumping speed; and determining the invasion depth of the mud filtrate based on the formation fluid volume model.
Owner:CHINA OILFIELD SERVICES
Preparation method of cationic plugging agent for drilling fluid
ActiveCN107501456AEasy accessEffective control of molecular weightDrilling compositionFiltrationEmulsion polymerization
The invention discloses a preparation method of a cationic plugging agent for a drilling fluid. The cationic plugging agent is prepared by emulsion polymerization from raw materials in parts by weight as follows: 30-90 parts of styrene, 5-75 parts of butyl acrylate and 15-75 parts of dimethyl diallyl ammonium chloride. Monomers are initiated by an initiator to be subjected to a polymerization reaction, and the cationic plugging agent with the macromolecular chain is obtained; with addition of a small quantity of the product to the drilling fluid, the filtration loss of the drilling fluid and the invasion depth in the sand bed can be effectively reduced, plugging of underground pore cracks is realized, and drilling safety is guaranteed.
Owner:XUZHOU NORMAL UNIVERSITY
Measuring device for determining invasion depth of mud filtrate
ActiveCN104280326AImprove Intrusion Research CapabilitiesRealistic simulationPermeability/surface area analysisSaline waterElectricity
The invention discloses a measuring device for determining the invasion depth of mud filtrate. The measuring device comprises a simulation wellbore, an invasion chamber and a data collection device, wherein a window is formed in the simulation wellbore; a stratum module is arranged in the invasion chamber; the invasion chamber is tightly connected with the window of the simulation wellbore; the invasion chamber is provided with an electrode; the outlet end of the invasion chamber is provided with a leak-off flow measuring device; the data collection device comprises a data collection controller and a computer; the electrode is connected with the data collection controller; and the data collection controller is connected with the computer. The measuring device has the characteristics of being vivid and visual in simulation degree, high in accuracy, simple to operate and the like; the device is suitable for measurement of mud invasion experiments of the stratum module under the conditions of fresh water mud and salt water mud and research of influences on an electric logging response of a reservoir caused by mud invasion, provides experimental data for building a mud invasion correction model of the logging response of the reservoir, and is of great significance on improvement of domestic mud invasion research capability.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Application of EIF5A2 to preparation of esophageal squamous cell carcinoma prognosis reagent
ActiveCN103468799APromote formationPromote invasionMicrobiological testing/measurementMaterial analysisOxygen deprivationNode metastasis
The invention discloses application of EIF5A2 to preparation of an esophageal squamous cell carcinoma prognosis reagent. Real-time quantitative PCR (Polymerase Chain Reaction) detection data shows that expression of the EIF5A2 in esophageal squamous cell carcinoma tissues is obviously higher than that in corresponding non-tumor tissues. An immunohistochemical data analysis result shows that expression of the EIF5A2 is positively correlated to lymphatic metastasis, the tumor invasion depth and neoplasm staging. Kaplan-Meier analysis shows that a patient overexpressed by the EIF5A2 has poor overall survival (p is less than 0.001). Multivariate analysis also proves that the EIF5A2 is an independent prognostic factor. The EIF5A2 possibly takes important effects in invasion and metastasis of esophageal squamous cell carcinoma. Further experimental data proves that overexpression of the EIF5A2 can be caused by gene amplification and oxygen deprivation; the EIF5A2 can be combined into a promoter region of HIF1a to up-regulate expression of the HIF1a; and the EIF5A2 can induce epithelial-mesenchymal transition conversion and promote angiopoiesis of the esophageal squamous cell carcinoma so as to promote invasion and metastasis of the esophageal squamous cell carcinoma. Knockout of the EIF5A2 can obviously inhibit tumor metastasis and the silent EIF5A2 is expected to be a potential target of esophageal squamous cell carcinoma treatment.
Owner:SUN YAT SEN UNIV CANCER CENT
Gas reservoir density calculation method based on density, neutron and nuclear magnetic resonance logging
ActiveCN108979629AThe calculation result is accurateAccurate and reliable total porosityBorehole/well accessoriesComplex mathematical operationsPorosityNMR - Nuclear magnetic resonance
The invention discloses a gas reservoir density calculation method based on density, neutron and nuclear magnetic resonance logging, comprising the specific steps of S1, acquiring three logging curves, to be specific, applying neutron logging-while-drilling, density logging and nuclear magnetic resonance logging to the same best measurement, and alternatively, applying cable neutron logging, density logging and nuclear magnetic resonance logging to the same measurement, thereby ensuring that an object reservoir under measurement gains time unification and invasion depth approximation; S2, applying an equation that is shown in the description to density logging measurement information; S3, applying an equation that is shown in the description to neutron logging measurement information; S4,applying an equation that is shown in the description to nuclear magnetic resonance logging measurement information; S5, through simultaneous equations of neutron, density and nuclear magnetic resonance, calculating three unknown numbers: true total porosity phi of the gas reservoir, gas saturation (1-S<xo>) and gas reservoir density rho h; S6, outputting calculation results. The method herein helps provide logging evaluation for gas reservoirs, provides precise reliable total porosity, flushed zone gas saturation and gas density, provides improved geological evaluation accuracy, has accuratemodel calculation results and is widely applicable.
Owner:CHINA NAT OFFSHORE OIL CORP +1
Bearing strength experiment instrument of high-temperature high-pressure mud cake plugging
ActiveCN101109739BThe experimental effect is intuitiveStable jobMaterial analysisSlurryData treatment
The invention provides a tester for the bearing and plugging strength of a mud cake under high temperature and high pressure, which can simulate the static conditions in a well and test the invasion depth of slurry filter liquid, bearing strength of mud cake, plugging and bearing strength against cracks in drilling for oil (gas) wells. The tester essentially comprises a mud-cake performance evaluation and test vessel assembly, a pressure pipe system, a temperature control system, a displacement record system, an automatic cleaning system and a computer data processing system. The tester allows all-sided simulation of the temperature, pressure and stratum features (seepage) under a well, determination the plugging and bearing strength of mud cakes, optimization of drilling fluid, rapid andsafe drilling, therefore the tester is of a very wide application prospect.
Owner:CHINA PETROLEUM & CHEM CORP +1
A visual simulation shale micro-fracture plugging ability test system and its test method
ActiveCN103485762BIntuitive visual macro analysisImprove general applicabilityConstructionsBorehole/well accessoriesMicroscopic observationRock sample
The invention relates to a visual simulation shale micro-crack plugging capacity test system and a visual simulation shale micro-crack plugging capacity test method. Displacement evaluation experiment is performed on a single or combined micro-crack rock sample by a solution or a drilling fluid which contains the plugging agents with different concentrations and different types at different experiment conditions, such as pressure differences and times, indexes, such as the invasion depth, are compared, the formation conditions of inner mud cakes in drilling are directly described, and microscopic observation and analysis are performed on percolation substances invade into the micro-cracks by utilizing amplification imaging instruments, such as a high-definition microscope, so that the plugging mechanisms and the effects of various drilling fluid plugging agents and drilling fluids are analyzed and researched intuitively and microscopically, a proper drilling fluid plugging agent is selected preferably, a drilling fluid system formula is optimized, the problem about the experimental conditions that the visual simulation evaluation cannot be performed on shale micro-crack plugging in the past is solved, and a new evaluation experimental research means is provided for related research and production in the technical field of fractured shale strata borehole wall stability in petroleum engineering.
Owner:CHINA PETROLEUM & CHEM CORP +1
Methods, apparatus and products for production of fluids from subterranean formations
Methods, apparatus and products for separating oil and mud filtrate down hole and production of each to the surface via separate tubing, that includes custom engineered drill pipe for which two types of openings called ports have been cut or drilled: production ports and isolation ports. The production port produces formation fluid (normally hydrocarbons) from a perforation. In one non-limiting embodiment, a tube is welded to the inside of the casing at each production port to transmit the formation fluid to the top of the drill pipe section where it is attached to a custom engineered casing collar (described below) designed to allow flow to the next drill pipe section of the device. The isolation port produces mud filtrate from the adjacent borehole wall exterior to the casing, and these isolation ports are arranged in a pattern around each production port to keep mud filtrate in the invaded zone from reaching the production port. The number and placement of the production ports as well as the number, placement and shape of the isolation ports are determined using the information regarding the perforating design and other information such as the filtrate type and estimates of invasion depth as determined by well logs. Packers are set above and below the apparatus to provide an “isolation” chamber to contain the produced filtrate. Tubing through the upper packer will produce the filtrate to the surface via differential pressure or pumping. After the casing has been cemented, the perforating guns in the production ports are fired to begin production of formation fluid.
Owner:WAID MARGARET COWSAR +1
Simulation experiment device for measuring stratum invasion depth of channeling sealing agent and measurement method of simulation experiment device
PendingCN106777471ATrue distributionTrue depthDesign optimisation/simulationSpecial data processing applicationsInjection pressureEngineering
The invention discloses a simulation experiment device for measuring a stratum invasion depth of a channeling sealing agent. The simulation experiment device comprises a hollow cylindrical sleeve, a kettle body which is arranged at the top of the sleeve and is fixedly connected with the sleeve, a base which is arranged at the bottom of the sleeve and is used for supporting and fixing the sleeve, a sand-filled pipe which is arranged in the sleeve along the axial direction of the sleeve, a perforation channel which is arranged between the kettle body and the sand-filled pipe and is used for communicating the kettle body with the sand-filled pipe, a compression module which is arranged in the sand-filled pipe and can slide up and down along the axial direction of the sand-filled pipe, and a jack which is arranged on the base and is used for driving the compression module to slide axially. According to the simulation experiment device, a booster pump is used for boosting inside the kettle body to simulate a process for injecting the channeling sealing agent on site under different pressure and displacement conditions so as to research the influence of the injection pressure and the displacement on the invasion depth of the channeling sealing agent; a test result is high in accuracy. The invention further discloses a measurement method of the simulation experiment device.
Owner:YANGTZE UNIVERSITY
A kind of preparation method of cationic plugging agent for drilling fluid
ActiveCN107501456BEasy accessEffective control of molecular weightDrilling compositionFiltrationEmulsion polymerization
The invention discloses a preparation method of a cationic plugging agent for a drilling fluid. The cationic plugging agent is prepared by emulsion polymerization from raw materials in parts by weight as follows: 30-90 parts of styrene, 5-75 parts of butyl acrylate and 15-75 parts of dimethyl diallyl ammonium chloride. Monomers are initiated by an initiator to be subjected to a polymerization reaction, and the cationic plugging agent with the macromolecular chain is obtained; with addition of a small quantity of the product to the drilling fluid, the filtration loss of the drilling fluid and the invasion depth in the sand bed can be effectively reduced, plugging of underground pore cracks is realized, and drilling safety is guaranteed.
Owner:XUZHOU NORMAL UNIVERSITY
Prediction method of separation depth of open-gate counterweight flow in linear stratified water environment
InactiveCN106017426BReduce human errorWell formedMeasuring open water movementWater resource assessmentTraffic capacityEnvironment water
The invention relates to a method for predicting gate opening type density flow separation depth in a linear stratified water environment. The method includes the following steps that firstly, related topographic data and water density data of a target research area are obtained; secondly, parameters are determined, wherein the parameters include environment water buoyancy frequency, the relative stratification degree of density flow inflow portion environment water, inflow speed of density flow and inflow unit discharge flow of density flow; thirdly, the data obtained in the first step and the data obtained in the second step are substituted into a gate opening type density flow separation depth prediction model (please see the model in the description), and the prediction value of the gate opening type density flow separation depth in the linear stratified water environment is calculated. The method for predicting the gate opening type density flow separation depth in the linear stratified water environment is simple in mode, accurate, efficient and capable of being used for quickly judging the invasion depth of density flow.
Owner:ZHEJIANG UNIV
Measurement of invasion depth while drilling utilizing streaming potential
InactiveUS20120259551A1Electric/magnetic detection for well-loggingSeismology for water-loggingEnvironmental geologyInvasion depth
A system for determining an invasion depth of an invaded zone surrounding a borehole while the borehole is being drilled includes a sensor configured to be disposed in a mud cake formed on a wall of the borehole and configured to measure a property of the mud cake and a computing device configured to receive a measurement from the sensor and determine the invasion depth based on the measurement.
Owner:BAKER HUGHES INC
A palace-lifting device capable of accurate positioning
Owner:THE THIRD XIANGYA HOSPITAL OF CENT SOUTH UNIV
A kit for assisting in judging lymph node metastasis of clinical early endometrial cancer
The invention discloses a kit used for assistant determination of clinical early stage endometrial carcinoma lymphonodus metastasis. The kit comprises a parameter acquisition equipment and a readablecarrier; the parameter acquisition equipment comprises an equipment used for acquiring a plurality of parameters relates to the readable carrier; the readable carrier is used for recording following content in formula I: LogitP=-4.992+1.606*G2+2.375*G3+1.383*C+0.871*H+0.869*F, wherein G is used for representing tumor grading value, C is used for representing serum CA125 concentration value, H is used for representing tumor myometrium invasion depth value, F is used for representing cervical stromal involvement degree value, and P is used for representing clinical early stage endometrial carcinoma lymphonodus metastasis risk of human subjects. The kit is used for assistant determination of clinical early stage endometrial carcinoma lymphonodus metastasis risk of human subjects based on clinically easily available tumor differentiation grading, serum CA125 concentration, tumor myometrium invasion depth, and cervical stromal involvement degree.
Owner:PEOPLES HOSPITAL PEKING UNIV
Novel structural air fryer
ActiveCN103479233BAchieving penetration depthPositioning rotationRoasting apparatusThermal energyDeep frying
The invention relates to a novel structural air fryer. The novel structural air fryer comprises a main body and a central controller which is arranged above the main body; the main body is provided with accommodating space; a grid-shaped rotational roasting cage is arranged inside the accommodating space; a heating device which can supply heat energy for the roasting cage is arranged on the main body. The novel structural air fryer is characterized in that an adjustable deep fryer is arranged under the roasting cage inside the accommodating space. According to the novel structural air fryer, various functions of dry frying, deep frying or less oil frying are achieved by adjusting deep fryer oil immersing depth of food in the roasting cage through the method of adjusting the height of the deep fryer due to the adjustable deep fryer. When the novel structural air fryer is used, moderate oil is injected into the deep fryer, relative height between the deep fryer and the baking cage is adjusted according to requirements such as frying time and taste to achieve adjustment of invasion depth of food in the deep fryer. Accordingly, the novel structural air fryer can be applied to multifunctional air fryer products.
Owner:DEA GENERAL AVIATION HLDG CO LTD
Detection method of erosion depth of free so42- ions on concrete surface
InactiveCN103630533BRapid responseObvious color phenomenonMaterial analysis by observing effect on chemical indicatorSulfatePenetration depth
The invention relates to a kind of concrete surface free SO 4 2‑ Detection method of ion erosion depth. This method is used when the concrete is subjected to external SO 4 2‑ In the case of penetrating erosion, use a special color developer to develop color on the concrete section, and use the color difference to judge the depth of sulfate attack in the concrete. The color development principle of the color developer is through the red precipitation of barium roseate and free SO in concrete 4 2‑ undergoes a displacement reaction to form white BaSO 4 Precipitation, in the concrete section (with SO 4 2‑ A color dividing line appears on the same erosion direction). The advantage of this method is that it is simple and easy to operate, the reaction phenomenon is obvious, and the color boundary formed can be maintained for a long time. It can be used not only for laboratory testing but also for external SO in concrete in engineering use. 4 2‑ On-site detection of penetration depth.
Owner:NANJING TECH UNIV
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