53results about How to "Low water separation rate" patented technology

The invention discloses coal water slurry prepared by mixing gasified coal with petrochemical wastes. The coal water slurry is prepared from the following components: coal, the petrochemical wastes, additives and water, wherein the mass of the petrochemical wastes accounts for 0-6% of the total mass of the coal water slurry but not zero, and the adding amount of the additives accounts for 0-0.15% of the total mass of the dry coal but not zero. The invention also discloses a slurrying technology of the coal water slurry. The coal water slurry provided by the invention is good in fluidity and stability.

The invention discloses a coal water slurry additive which is composed of 20-40 wt% of water reducing agent, 20-35 wt% of lignosulfonate, 20-35 wt% of inorganic alkali, 2-20 wt% of ethylene glycol, 2-15 wt% of sodium metasilicate pentahydrate and 1-10 wt% of carboxymethyl cellulose. Besides, the invention also discloses application of the coal water slurry additive in preparing a coal water slurry. The coal water slurry additive can promote the disperse phase (coal particles) to be uniformly dispersed in the dispersion medium (water), and can effectively enhance the hydrophilicity of the coal and the electrostatic repulsion among the coal particles. The prepared coal water slurry has the advantages of higher coal content (or concentration), low viscosity, low bleeding rate, high flowability and high stability. Compared with the traditional formula, the coal water slurry additive can lower the slurry making cost by more than 20%.

The invention discloses a non-acid solution high-strength plugging agent, and a preparation method thereof. The non-acid solution high-strength plugging agent is composed of, by weight, 55 to 60 parts of a curing agent, 3 to 5 parts of an activity improving agent, 2 to 3 parts of a mutual solvent, 0.8 to 1 part of a coupling agent, 1 to 2 parts of furan resin, and 1.5 to 3 parts of a dispersant. The non-acid solution high-strength plugging agent is mixed with an appropriate amount water so as to obtain a slurry; water segregation rate is less than 0.5%; breakthrough pressure gradient is larger than 1.0MPa / cm; stemming ratio is larger than 99.9%; and acid corrosion ratio is less than 1%. The non-acid solution high-strength plugging agent both possesses high strength and acid corrosion ratio, and is capable of satisfying high pressure bearing requirements of oil-water wells after plugging. Corrosion ratio of acidic mediums, such as mud acid, hydrochloric acid, nitric acid, and acetic acid, which are commonly used in oil-water well acidizing plugging removal on the non-acid solution high-strength plugging agent is low; acid resistance of the non-acid solution high-strength plugging agent is relatively high; and a technical problem that damage efficacy lose of plugged parts is easily caused by acidic fluids in oil-water well acidizing operation is solved.

The invention provides a high-waterproofness synchronous grouting slurry for submarine shield tunnels. The high-waterproofness synchronous grouting slurry comprises the following components as raw materials in percent by weight: 7.0-9.5% of a cementing material, 14.5-17.5% of ground limestone powder, 2.6-4.2% of sodium-based bentonite, 55-60% of river sand, a waterproofing agent of which the usingamount is 3.0% of that of the cementing material, a water reducing agent of which the using amount is 1.0% of that of the cementing material, hydroxypropyl methyl cellulose of which the using amountis 0.5% of that of the cementing material, polyacrylamide of which the using amount is 0.1% of that of the cementing material, an air entraining agent of which the using amount is 0.03% of that of thecementing material, and the balance of water, wherein the cementing material comprises cement and slaked lime according to a mass ratio of (4.0-5.5):(3.0-4.0). The high-waterproofness synchronous grouting slurry provided by the invention has relatively high waterproofness, relatively high early shear strength and strong seawater seepage resistance, and can provide certain shear resistance, so that the problems of floating of duct pieces and cracking-caused water seepage can be effectively solved and a role in stabilizing the duct piece is played.

The invention relates to a grouting construction process using a GIN grouting method. The method comprises the steps of forming a hole to be grouted, cleaning the hole to be grouted, surveying the hole to be grouted, uniformly dividing a grouting section into a plurality of grouting subdivisions according to a survey result, installing a grouting construction control system, grouting the hole to be grouted through the grouting construction system, controlling the grouting pressure, when each grouting time threshold is reached, adding a grouting pressure increment on the basis of an original grouting pressure to continue grouting, and when the grouting pressure reaches the preset grouting pressure threshold, ending the grouting; by using the technical scheme of the process, the grouting strength value GIN of each grouting subdivision section is controlled by a computer, so that the grouting strength value GIN of the whole hole to be grouted in the grouting process is kept constant, anda perfusion flow rate and a perfusion pressure are always matched, the quality of the grouting construction operation is improved, and the process has the advantages that the construction process is simple, the work efficiency is high, the anti-seepage effect is good and the like.