66results about How to "Wide range of particle size distribution" patented technology

Disclosed are a gel plugging slurry for well drilling, a preparation method of the plugging slurry, and a slug plugging method. The gel plugging slurry comprises water, a specialty gel, a bridging material, a jointing material and a filling material, in amounts of 1-15 parts by weight of the specialty gel, 8-20 parts by weight of the bridging material, 20-40 parts by weight of the jointing material and 25-45 parts by weight of the filling material based on 100 parts by weight of water. The gel plugging slurry has a short wait-on-cement time at rest, exhibits a rapid effect, and can quickly form a structure at fractures in a leakage formation; and the bridging material, the jointing material and the filling material can effectively plug various fractures that vary widely in width. In the slug plugging method, a packer is lowered to pack a well bore, so as to ensure that the plugging slurry can accurately reach the leakage formation and to enhance plugging efficiency.

The invention discloses a hard compound reinforcing bridging agent comprising the following materials in parts by weight: 30-40 parts of shell powder, 15-30 parts of calcium carbonate, 30-40 parts of natural hard rubber and 20-30 parts of natural hard fiber. A preparation method comprises the following step: uniformly mixing and stirring the materials in parts by weight at normal temperature and pressure. The hard compound reinforcing bridging agent is prepared by compounding elastic plugging materials with a certain rigidity according to a scientific mixing proportion, and rigid solid granules with different granule diameters enter leaking cracks, leaking pores and leaking passages in the plugging construction process and play bridging and supporting roles in the leaking cracks, the leaking pores and the leaking passages with different sizes. The invention has high supporting capability and plugging characteristic, wide using range, and the like and is widely applied to leakage prevention and plugging technologies of oil and geological exploration.

The invention relates to water absorption resin for well repair and leaking stoppage. The water absorption resin is prepared by the following synthesis steps of: a, mixing 10 to 15 percent of 2-acrylamide-2-methylpropanesulfonic acid, 30 to 45 percent of acrylamide, 0.2 to 0.5 percent of N,N-methylenebisacrylamide and deionized water in a weight ratio with stirring to form a mixture, wherein the stirring time is 5 to 10 minutes and the stirring temperature is 30 to 50 DEG C; b, putting the prepared mixture into a polymerization reaction kettle, stirring the mixture, introducing nitrogen for 30 minutes to displace air in the polymerization reaction kettle, simultaneously heating the polymerization reaction kettle to the temperature of between 40 and 50 DEG C, then adding 0.03 to 0.08 weight percent of persulfate initiator into the mixture, performing polymerization reaction on the mixture to generate the water absorption resin, and preserving heat for at least 6 hours after the polymerization reaction starts; and c, drying the prepared water absorption resin at the temperature of not more than 120 DEG C for 24 hours till complete drying, and crushing the dried water absorption resin into granules with a diameter of 0.5 to 40 millimeters to obtain the water absorption resin for well repair and leaking stoppage.

The invention relates to a device and process for manufacturing a positive / negative electrode material of a lithium battery. The device consists of a feeder, a fluidized bed mixer, a gas-solid separator, a spiral continuous feeding reaction device preheating section, a spiral continuous feeding reaction device reacting section, and a cooling device. The process for manufacturing the positive / negative electrode material of the lithium battery comprises the following steps of: firstly feeding raw materials for manufacturing the positive / negative electrode material of the lithium battery into the fluidized bed mixer through the feeder, fully mixing and then separating by the gas-solid separator, sequentially entering the spiral continuous feeding reaction device preheating section and the spiral continuous feeding reaction device reacting section, heating and reacting to generate the positive / negative electrode material of the lithium battery, and then entering the cooling device to be cooled, finally discharging the positive / negative electrode material of the lithium battery from a product outlet. The device and process provided by the invention can be used for continuously manufacturing the positive / negative electrode material of the lithium battery efficiently with low energy consumption.