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984results about How to "Reduce permeability" patented technology

Artificial foaming-oil huff and puff oil production method for heavy oil reservoir

The invention provides an artificial foaming-oil huff and puff oil production method for a heavy oil reservoir. The method comprises the following steps: filling aqueous solution of foaming oil accelerant and nitrogen into the heavy oil reservoir, wherein the foaming oil accelerant comprises a foaming oil accelerant A, a foaming oil accelerant B and a foaming oil accelerant C of which the mass ratio is 1:1:1; soaking for 1 to 5 days; opening a well to produce oil in a certain production differential pressure range and stopping producing oil when the single-well daily oil production reaches single-well economic limit; repeating the step 1 to the step 3 and stopping production until the single-well cyclic oil production reaches cyclic economic limit, wherein the heavy oil reservoir has a reservoir thickness of over 2m, reservoir permeability of over 10*10<-3> mu<m2>, a reservoir temperature of lower than 120 DEG C, viscosity of crude oil of over 50mPas, oil saturation of over 30 percent and water saturation of over 50 percent. According to the artificial foaming-oil huff and puff oil production method for the heavy oil reservoir, which is provided by the invention, the viscosity of crude oil can be reduced and elastic energy of fluid can be increased so as to increase single-well productivity and a recovery ratio of an oil field.
Owner:PETROCHINA CO LTD

Experimental device researching influence of formation water with high degree of mineralization on CO2 flooding

The invention provides an experimental device researching influence of formation water with a high degree of mineralization on CO2 flooding. The experiment device comprises a gas cylinder, a core holding unit and a gas-liquid separating device. The gas cylinder is connected to a piston container, the top of the piston container is connected to a back-pressure valve and a pressure gage, the bottom of the piston container is connected to an ISCO pump, the pressure gage is connected to the core holding unit, the outlet end of the core holding unit is connected to the gas-liquid separating device, and the gas-liquid separating device is connected to an upper computer through a gas flowmeter. The back-pressure valve is connected to the back-pressure valve, the side face of the core holding unit is connected to a circular pressing pump and the suction lift is high, the outlet of the core holding unit is connected to the back-pressure valve, and the back-pressure valve is connected to a back-pressure pump. The designed device can compare changes of core permeability after and before CO2 flooding, porosity, pore structures, contents of core minerals, surface shapes of the cores, masses of the core and the recovery rates and research influence of CO2 flooding on reservoir physical property and development parameters.
Owner:ZHEJIANG OCEAN UNIV

Cotton seedling raising transplantation method

The invention relates to a method for transplanting cotton seedlings. The method comprises three steps of preparation of a matrix, sowing and transplanting sequentially. Step 1, cotton stalks, rape stalks, corn stalks, soybean stalks or wheat straws are crushed, added with a nitrogenous fertilizer, and mixed with human excrement or livestock and poultry manure bio-fertilizer or other fertilizers to obtain a mixture which is treated to obtain a prepared material, then the prepared material is sun-dried or baked, added with a fungicide and bagged for spare use; step 2, the prepared cotton stalk matrix or the matrixes prepared from other stalks are filled in a seedling raising aperture disk or flatly spread on a plastic film laid on the ground as a seedbed, seeds are sown, watered and covered with an agricultural film, and seedlings are raised under heat insulation condition; step 3, an antitranspirant and a rooting agent are applied before transplanting; the taken seedlings are bound, put in the watered rooting agent solution for root soaking, and then taken out and put in a watered gel containing a water retention agent to dip the roots; when in transplantation, the water retention agent is applied to planting furrows; after transplantation, the seedlings are covered with soil, and irrigated with adequate water for fixing the roots. The method is characterized by high seedling survival rate, stable effect, short rejuvenation period, low cost and environmental protection.
Owner:操宇琳

Method and device for detecting corrosion of component with permeability magnetic material protective layer

InactiveCN101520435ALow permeabilityIncreased penetration depthMaterial magnetic variablesPhysicsUltrasound attenuation
The invention provides a method for detecting the corrosion of a component with a permeability magnetic material protective layer. The method comprises the following steps: the permeability magnetic material protective layer is magnetized to be saturated or deeply saturated, a reference area and a area to be detected are selected on the surface of a detected component, pulsed eddy current sensors are arranged on the protective layers of the two areas, the square-wave exciting is applied to exciting coils of the pulsed eddy current sensors, the attenuation curve of the induced voltage in the detecting coils of pulsed eddy current sensors is measured after the level of square waves is reduced to the low level, and the difference between the attenuation curves of the induced voltage in the two areas is compared, thus the corrosion condition of the area to be detected relative to the reference area can be further distinguished. The invention also provides a device for realizing the method, which comprises a pulsed eddy current sensor, a square-wave signal exciting circuit, a signal processing circuit, an A/D conversion circuit and a computer which are connected in sequence, wherein the pulsed eddy current sensor is provided with a magnetization unit. The invention improves the sensitivity of corrosion detection of the component with the permeability magnetic material protective layer and is suitable for detecting the corrosion of the component on-line without dismounting the protective layer and the cladding layer.
Owner:HUAZHONG UNIV OF SCI & TECH

Sample introduction device and method

InactiveUS20140331744A1Reduced discriminationHeating rates and programmes can be varied widelySamplingComponent separationGas analysisGas phase
The present invention relates to an injector for use in gas phase analytical systems and methods comprising a metal housing, provided with a carrier gas inlet, a split outlet, a column outlet of the injector, a sample inlet, a liner, and a heater device comprising at least one coil for radio frequency inductive heating the housing with a predetermined temperature program and for providing a predetermined spatial temperature profile in the injector. The injector according to the invention allows performing gas phase analyses, especially GC analyses with reduced discrimination. Advantages of heating with a heater device comprising a coil for inductive heating include a homogeneous heating profile of the housing including parts connected thereto, with heating rates that can be varied widely. A further advantage is that the injector can be operated as a conventional S / SL injector at a predetermined temperature, or as PTV injector or thermal desorption injector with certain predetermined temperature programs. The invention also relates to a process of making an injector according to the invention, and to a process of refitting an existing S / SL injector. The invention further concerns a gas analytical system comprising an injector according to the invention, and to a process of analysing a sample with such gas analytical system.
Owner:DSM IP ASSETS BV

Anti-paste and anti-graffiti fluorocarbon coating and use method thereof

ActiveCN101629049AIncrease crosslink densityImprove the compactness of the paint filmPolyurea/polyurethane coatingsChemistryHardness
The invention relates to an anti-paste and anti-graffiti fluorocarbon coating which is prepared by mixing a component A and a component B in a proportion of OH/NCO=1:(1.0-1.1), wherein the component A comprises the following components in percentage by weight: 50-65 percent of FEVE fluororesin, 1-3 percent of modified polydimethylsiloxane resin containing hydroxide radicals, 8-15 percent of butyl acetate, 15-25 percent of propylene glycol methyl ether acetate, 0.2-0.4 percent of defoaming agent and 0.1-0.3 percent of flatting agent; and the component B is prepared by mixing 80 parts of IPDI isocyanate curing agent or GDI multifunctional isocyanate curing agent by weight and 20 parts of anhydrous butyl acetate by weight. The coating has high film crosslinking density and hardness, low surface tension, extremely strong permeability resistance and excellent anti-paste and anti-graffiti performance, and intractable oil pen graffiti can also be easily and completely wiped out. The coating also has excellent wear-resistant, scouring resistant and weather resistant properties and is suitable for long-term outdoor use. The coating can be painted and can also be sprayed after being diluted by adding 10-20 percent of PMA or polyurethane coating diluent.
Owner:SHENZHEN GRANDLAND ENVIRONMENTAL COATING CO LTD

Axial friction welding process method of high-nitrogen austenitic stainless steel and non-magnetic drill collar

InactiveCN108907447AAchieve weldingGuaranteed normal work requirementsTubular articlesHollow articlesFriction weldingNon magnetic
The invention relates to an axial friction welding process method of a high-nitrogen austenitic stainless steel and non-magnetic drill collar and belongs to the field of preparation of oil-gas drilling tools. The method comprises the application steps: workpieces made from high-nitrogen austenitic stainless steel are clamped into a friction welding machine, then, workpieces in a clamp of a rotating end and a clamp of a moving end are welded, the workpiece of the moving end moves towards the workpiece of the rotating end when welding is started, at this time, the workpiece of the rotating end starts to rotate, the workpiece of the rotating end and the workpiece of the moving end start to produce heat due to friction under the action of frictional pressure after contact, rotation is stoppedwhen a friction amount of deformation reaches a set value, upset forging is started, upset forging pressure is applied to the workpieces along the axial direction of the workpieces and is maintained,and a workpiece is taken out after the upset forging pressure is unloaded, thereby obtaining the non-magnetic drill collar. According to the method, the non-magnetic drill collar is processed and repaired by an axial friction welding method, so that the problems, i.e., material waste, relatively high cost and relatively low production efficiency of the existing processing methods are improved, andthe problem that a failed drill collar is difficult to repair is solved.
Owner:SHANDONG UNIV

High-manganese non-magnetic steel containing niobium and preparation method thereof

A high-manganese non-magnetic steel containing niobium and a preparation method thereof belong to the technical field of non-magnetic steel production. Components of the high-manganese non-magnetic steel containing niobium comprises, by mass percent, 10 to 15 % of Mn, 0.8 to 1.2 % of C, 0.3 to 0.5 % of Si, less than 0.008 % of P, less than 0.005 % of S, 0.01 to 0.02 % of Nb, and the balance being Fe. The preparation method comprises steps of smelting, forging, hot rolling, water toughening, and water quenching after the hot-rolled plate is kept in a heating furnace for 15 minutes at 1000 DEG C. The method is advantageous in that the high manganese steel is pre-deformed by using a rolling method, thereby being capable of refining grain size and improving organization and performance, and a finished product has tensile strength of 900 to 1100 MPa, elongation percentage of 50 to 60%, Rockwell hardness of 15 to 22 HRC and magnetic permeability of less than 1.0002. According to the invention, the non-magnetic steel is superior in magnetic, mechanical and processing properties, and the method is simple in production, low in economic cost, and is applicable in the fields of mechanical production and transportation, such as nonmagnetic structural members and nonmagnetic molds used for magnetic shielding in large and medium-sized transformer oil tanks, train tracks, etc.
Owner:UNIV OF SCI & TECH BEIJING

MIM manufacturing process for weak-magnetism 17-4PH material part

ActiveCN108380888AControl Nitriding DepthControl the nitriding depth to meet the magnetic requirementsTransportation and packagingMetal-working apparatusNitrogenRoom temperature
The invention discloses an MIM manufacturing process for a weak-magnetism 17-4PH material part. The MIM manufacturing process comprises the following technological steps of: preparing an MIM injection-molded blank; degreasing; sintering; and discharging, wherein in a sintering process, the temperature is increased from the room temperature to 550-650 DEG C at a temperature rise speed of 3-3.5 DEGC/min in negative-pressure sintering; the temperature is increased from 550-650 DEG C to 950-1050 DEG C at a temperature rise speed of 3.8-4.5 DEG C/min in vacuum sintering; the temperature is increased from 950-1050 DEG C to 1270-1300 DEG C at a temperature rise speed of 2-2.5 DEG C/min in partial-pressure sintering; in a first-stage cooling process, the temperature is reduced from 1270-1300 DEGC to 1050-1150 DEG C; in a first-stage cooling temperature-maintaining process, the temperature is maintained for 60 min to 360 min at 1050-1150 DEG C, and nitrogen is charged; in a second-stage cooling process, the temperature is reduced from 1050-1150 DEG C to 550-650 DEG C; and in a third-stage forced cooling process, the temperature is reduced from 550-650 DEG C to 70 DEG C or lower in a forced cooling manner. A product manufactured by the manufacturing method disclosed by the invention is high in dimensional accuracy, high in strength, good in weak magnetism and corrosion resistance, andsmaller than 1.2H/M in magnetic conductivity.
Owner:QUJING ZHONGMING TECH
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