35results about How to "High breaking voltage" patented technology

The invention relates to a high voltage direct current breaker with multiple fractures and a tandem type. The breaker comprises a multi-fracture breaker, an oscillation loop and a dissipative element. The multi-fracture breaker includes a plurality of single-phase breakers and fractures of all the single-phase breaker are in series connection through connection buses; the multi-fracture breaker is respectively in parallel connection with the oscillation loop and the dissipative element through the connection buses; and a fracture of each the single-phase breaker is respectively in parallel connection with an RC equalizer circuit. According to the invention, fractures of a plurality of single-phase breakers are in series connection so as to form a multi-fracture tandem structure; effects of high drop-out voltage, heavy drop-put current and short drop-out time and the like are realized; and demands of ultra-high voltage and extra-high voltage direct current power transmission projects can be completely met. In addition, the oscillation loop in the invention is used for generating oscillation currents; the dissipative element is used for absorbing line energy and restricting overvoltages after currents are switched off; and the RC damping circuit is used for improving equalizing voltages between fractures of all the single-phase breakers.

The invention relates to a soil-phase-free oil-based drilling fluid. The soil-phase-free oil-based drilling fluid is prepared from the following raw materials in percentage by weight: 50-85 percent of base oil, 5-30 percent of CaCl2 saline, 1-4 percent of composite type emulsifier G326-HEM, 1-5 percent of filtrate reducer G328, 0.5-3 percent of alkalinity conditioning agent, 0.5-3 percent of tackifier, 0.2-2 percent of viscosifier and the balance of barite. According to the soil-phase-free oil-based drilling fluid, the demulsification voltage is higher than 800V, and the temperature resistance of higher than 180 DEG C is achieved; the formula is simple, the field operation and maintenance are convenient, and the soil-phase-free oil-based drilling fluid has good rheological property in the absence of a wetting agent under the condition of high density; the system is widely applicable to the base oil and can be used in mineral oil or gaseous oil; and a novel method is provided for lowering the well leakage loss of the oil-based drilling fluid, the cost of the drilling fluid is also remarkably lowered, good economic and social benefits are obtained, and thus the soil-phase-free oil-based drilling fluid is worthy of popularization and application.

The invention provides a plant oil-based drilling fluid and a preparation method thereof. The plant oil-based drilling fluid comprises plant oil, a saline solution and a treating agent, wherein the volume ratio of the plant oil to the saline solution is (80:20) to (95:5); the treating agent comprises an emulsifier, a wetting agent, organic soil and a filtrate reducer. Based on 100mL of plant oil and saline solution, the content of the emulsifier is 2.5-3.5g, content of the wetting agent is 0.5-0.8g, the content of the organic soil is 0.5-2g and content of the filtrate reducer is 3-5g; the density of the drilling fluid is 0.88-1.6g/cm<3>. As the selected base oil is plant oil in the natural biologic chain, the plant oil-based drilling fluid provided by the invention can be biodegraded and further has the advantages of good emulsion stability, low high-temperature and high-pressure filter loss and good water-resisting, soil-resisting, salt calcium-resisting and gypsum pollution-resisting capacities.

The present invention discloses an apparatus and a method for online maintenance of a valve regulated sealed lead acid storage battery. According to the present invention, the backward battery in the storage battery pack is repaired by using a semi-offline technology, cyclic charging, pulse charging, low current trickle charging and other ways; and with the method of the present invention, the storage battery can not depart from the online backup status, the backward storage battery is subjected to maintenance by using the charging device of the user and the loading, and the occurrence of the phenomenon that the severe overcharge is generated during the storage battery pack so as to cause the storage battery dehydration can be avoided by using the semi-offline mode so as to prolong the service life of the storage battery.

The invention discloses a high-temperature-resistant oil-base drilling fluid emulsifier which is prepared by reacting the following components in parts by weight: 9-12 parts of polyolefin, 1-3 parts of maleic anhydride, 18-22 parts of xylene, 3-5 parts of polyethylene polyamine, 2-4 parts of polyethyleneglycol and 1-3 parts of octyl phenol polyethenoxy ether. The invention also discloses a preparation method of the emulsifier. The emulsifier has better emulsifying effect on the water-in-oil drilling fluid system which uses diesel and white oil as continuous phases, has superhigh high-temperature resistance, can keep high emulsion-breaking voltage of the oil-base drilling fluid at the high temperature of 200 DEG C or so, and can enduringly ensure the emulsifying stability, rheological property and pollution resistance of the oil-base drilling fluid.

The invention discloses a high-temperature emulsifier applied to oil-based drilling fluids and a preparation method of the high-temperature emulsifier, and belongs to the technical field of petroleumdrilling fluids. The high-temperature emulsifier comprises, by mass, 10-45% of fatty acid amide, 30-60% of oxidized fatty acid, 10-30% of Malay acidized tall oil fatty acid, 5-20% of rheological property regulators and 10-30% of mineral oil. The total percentage of the raw materials is 100%. The preparation method includes mixing the fatty acid amide with the oxidized fatty acid, the Malay acidized tall oil fatty acid, the rheological property regulators and the mineral oil, stirring the raw materials at the temperature of 60 DEG C for 1-2 hours of reaction, and discharging the mixture to obtain the high-temperature emulsifier. The high-temperature emulsifier has the advantages of high temperature resistance, high demulsification voltage, low filter loss, capability of stabilizing a drilling fluid system, low adding amount, convenience and effectiveness in use, convenience in popularization and application, and the like. The preparation method has the advantages of simple procedure andstep, convenience in production and greatly reduced production cost.

The invention discloses a well cementation flushing fluid for oil-based drilling fluid as well as a preparation method and a use method of the well cementation flushing fluid. The well cementation flushing fluid comprises fresh water, a nonionic surfactant I, a nonionic surfactant II, a normal salt cosolvent and an acidic salt cosolvent, wherein the nonionic surfactant I is a fatty alcohol-polyoxyethylene ether nonionic surfactant, and the nonionic surfactant II is a nonylphenol polyoxyethylene ether nonionic surfactant; the nonionic surfactant II has good emulsifying property, and an hydrophilic base end is easily adsorbed on the surfaces of an oil-water interface, a sleeve and a well wall; the non-ionic surfactant I is used as a main agent of the flushing fluid, has good wettability, foamability, detergency and emulsifying power, has relatively high degreasing capacity, hard water resistance, is easy to biodegrade and has good compatibility; the normal salt cosolvent and the acidic salt cosolvent are used for assisting dissolution of the two nonionic surfactants, and meanwhile, the elution capacity of the well cementation flushing fluid on drilling fluid and oil-based mud cake isenhanced; safety is high, the formula is simple, cost is low, and environment friendliness is achieved.

The invention provides a high-temperature-resistant ultrahigh-density oil-based drilling fluid and a preparation method thereof. The high-temperature-resistant ultrahigh-density oil-based drilling fluid comprises a base fluid and a weight adjusting agent. The base fluid comprises the following components in percentage by mass: 15-35% of base oil, 0.05-1.50% of a tackifier, 0.05-1.50% of a suspension enhancer, 1.05-13% of an emulsifier, 20-75% of lime, 1-10% of a filtrate reducer, 1-10% of a bridge plugging agent and 0.05-3% of a wetting agent. The weight adjusting agent comprises a calcium chloride aqueous solution and a weighting agent. The weighting agent comprises barite, micro-manganese ore powder and micro-ilmenite powder. The oil-based drilling fluid has the characteristics of high temperature resistance, high density, strong stability and excellent rheological property, and can meet the development requirements of ultrahigh-pressure and ultrahigh-temperature stratums.

The invention relates to the technical field of oil-based spacer fluid, and particularly relates to oil-based spacer fluid for well cementation and cementing and a preparation method thereof. The oil-based spacer fluid for well cementation and cementing comprises a weighting material, a wetting agent, organic soil, oil, a suspending agent, a dispersing agent, a polymer fluid loss agent, an emulsifying agent and water. The preparation method comprises the five steps, a first mixture, a second mixture and a third mixture are sequentially obtained, and finally, the oil-based spacer fluid for wellcementation and cementing is obtained. By adjusting the oil-water ratio of the spacer fluid, pollution of the oil-based drilling fluid is reduced, and finally the purposes of simplifying cementing construction, improving the success rate and reducing the cost in the oil-based drilling fluid environment are achieved. According to the invention, oil is adopted as a main mixed liquid, and the interface wettability of the oil after being mixed with the oil-based drilling fluid and cement paste is changed under the combined action of the oil and the matched additives and emulsifiers, so that the technical indexes such as compatibility, stability and density of the oil-based drilling fluid, the spacer fluid and the cement paste are improved, and the technical requirements of well cementation and cement injection can be met.

The invention provides a preparation method of an emulsifier. The emulsifier is prepared from C4-C10 amino-containing carboxylic acid, C2-C10 dibasic acid, C3-C18 aliphatic amine and C12-C18 monobasicacid through a reaction. The emulsifier with a dendritical structure is prepared from the specific raw materials, the heat resisting property of the emulsifier can reach 220 DEG C, the emulsifier hasbetter emulsion stability and stability ratio, flowability of a drilling fluid can be improved by the emulsifier, demulsification voltage can be increased, and site operation demands can be met better. The invention further provides the emulsifier prepared with the method and an oil-based drilling fluid containing the emulsifier.

The invention discloses an emulsifier for an oil-based drilling fluid. The emulsifier is prepared from the following raw materials in parts by weight: 40-50 parts of an emulsifier base solution, 25-30parts of an anti-fouling emulsion and 10-15 parts of white oil, an emulsifier base solution is prepared in the preparation process; the emulsifier base solution takes tall oil fatty acid as a raw material, converts carboxyl in the tall oil fatty acid into acyl chloride under the action of triphosgene, reacts with ammonia to amidate the tall oil fatty acid; furthermore, bis (1, 5-cyclooctadiene) nickel is used as a catalyst, a carbon-nitrogen bond on amide is cut off and methanol is taken as a nucleophilic reagent, the tall oil fatty acid is further esterified after amidation to obtain an emulsifier base solution, the emulsifier base solution is further treated to obtain the emulsifier, after the emulsifier is mixed with the oil-based drilling fluid, the demulsification voltage of an oil-based system can be increased, and the emulsifier also has a relatively strong anti-pollution effect, greatly improves the temperature resistance of the oil-based system, and is stable in performance and simple to use.

The invention relates to a preparation method of an inert dilution agent for an oil-based drilling fluid. According to the technical scheme, the preparation method comprises the following steps that 1, low-viscosity synthetic base oil is added in a beaker with a stirrer and a thermometer, and a reaction is carried out at the 50-90 DEG C for 3-6 hours, and then heating is stopped; 2, an emulsifyingagent is added into the reactor in the step 1, and stirring is conducted 3-6 hours; 3, a filtrate reducer, a wetting agent, an alkalinity regulating agent and a calcium chloride water solution are mixed in a ratio and then added into the reactor in the step 1, and stirring is conducted for 6-8 hours; 4, the mixture in the reactor is stirred at a high speed, a reaction is carried out at the temperature of 50-90 DEG C for 3-6 hours, cooling is conducted until to the room temperature, an emulsion is formed, and the emulsion is the inert dilution agent for the oil-based drilling fluid. The preparation method has the advantages that under the condition that the inhibitive ability and the shear thinning performance of the oil-based drilling fluid are not changed, the plastic viscosity can be reduced, and the drilling fluid obtained before and after addition of the inert dilution agent cannot affect construction safety even in the construction process.

The present invention relates to a water-in-oil releasing liquid and a production method thereof. The production method sequentially comprises: (1) preparing raw materials, wherein the raw materials comprise, by weight, 200 parts of water, 680 parts of diesel oil, 10-20 parts of oleic acid, 20-25 parts of slaked lime, 20-30 parts of a wetting reversion agent dodecyl trimethyl ammonium bromide, 60-70 parts of a solid emulsifier SN-1, 10-20 parts of an anti-sloughing agent FT-1, 20-30 parts of a fast penetrant T, and 20-65 parts of barium sulfate; and (2) pouring the diesel oil into a high speed stirring tank, adding the solid emulsifier SN-1 under the 20000 rpm stirring condition to stir for 15-20 min, adding the water, stirring for 20-30 min so as to make oil and water be completely emulsified, sequentially adding the oleic acid, the slaked lime, the anti-sloughing agent FT-1, the wetting reversion agent and the barium sulfate, stirring, finally adding the fast penetrant T, and stirring for 30-40 min so as to obtain the water-in-oil releasing liquid.

The invention discloses a ceramic insulating shell of a contactor, a relay, a circuit breaker and a switch, and particularly relates to a device ceramic insulating shell which has a strong arc ablation resistance, can be welded in a metallized and sealed manner, and has the functions of high dielectric strength, high breakdown voltage, high temperature resistance, acid and alkali resistance, highstrength and the like. The shell and the structure are applied to an electric control device, the on-off voltage direct current of the traditional electric control device can reach 600VDC or above, the alternating current of the traditional electric control device can reach 800VAC or above, and the safety and environmental adaptability indexes of the device can be greatly improved.