172 results about "Plastic viscosity" patented technology

The invention discloses whole-oil synthetic base drilling fluid which mainly comprises following components: base liquid 100 parts, histosol 2-5 parts, viscosity increaser 0.5-3 parts, filtrate reducer 2-5 parts, wetting agent 0.5-2 parts, emulsifier 1-3 parts, calcium oxide 0.5 part and weighting agent 27-180 parts. The invention has the advantages that firstly, the rheological property is good and the plastic viscosity is low, secondly, the anti-temperature performance is good and anti-temperature can reach 150 DEG C, thirdly, the invention is provided with good water loss wall building performance with API filter loss content<5ml and high temperature and high pressure filter loss content <= 10 ml, fourthly, the anti-pollution ability is strong and the anti-poor soil ability and the anti-water invasion ability respectively reach 20%, and fifthly, reservoir has good protective effects and the permeability recovery value is over 85%.

The invention relates to an oil-based drilling fluid for development drilling of a shale gas, and belongs to the technical field of drilling fluids for petroleum drilling engineering. The oil-based drilling fluid is characterized by being prepared from the following components by weight percent: 0.2% to 2% of main emulsifier, 0.1% to 1% of auxiliary emulsifier, 0% to 1.5% of wetting agent, 0.2% to 1.5% of alkalinity regulating agent, 0% to 1.5% of organic soil, 0% to 1.5% of tackifier, 0.2% to 2% of filtrate reducer, 0% to 80% of weighting agent, 0% to 20% of water phase and the balance of oil phase. The oil-based drilling fluid can be used for meeting a special requirement of the shale gas drilling to the drilling fluid, and is good in stability, inhibitory capability and lubricity even under low and high temperatures. The oil-based drilling fluid has the characteristics of high dynamic plastic ratio, low plastic viscosity, wide application range and good economic benefit.

The invention relates to a variable-diameter-tube drilling fluid rheology measuring method which is especially suitable for on-line detections of in situ drilling fluid rheology. The method comprises steps that: a variable-diameter-tube system is composed of 2 to 20 segments of tubules with different diameters, wherein the tubules are connected in series; a stable flow rate is provided for the variable-diameter-tube system by using a constant flow pump and a buffer; current velocities in different diameter segments of the variable-diameter-tube system are calculated according to the flow rate and the cross section areas of the tubules; velocity gradients in different diameter segments are calculated according to the current velocities and diameters of the different diameter segments of the variable-diameter-tube system; pressure losses in different diameter segments of the variable-diameter-tube system are detected by using a differential pressure gauge; shear stress values of the different diameter segments of the variable-diameter-tube system are calculated according to the pressure losses; and rheology parameters such as plastic viscosity, dynamic shearing force, flow pattern index, and consistency coefficient of the measured drilling fluid can be calculated according to the shear stress values under different velocity gradients. With the method provided by the invention, drilling fluid rheology and variation conditions thereof can be measured in real-time without changing the flow rate.

The present invention relates to an edible fat-based shell upon a packaging support having a desired shape that defines a volume therein. One or more walls of consistent thickness are formed directly on the packaging support from an amount of an edible shell-forming composition. The composition includes one or more fats, and has a plastic viscosity of about 10 to 40 Poise and a yield value of about 50 to 250 dynes/cm² prior to forming the shell on the support. The walls of the edible fat-based shell preferably have the shape of a cup, cone, or other open top receptacle and a filling is at least partially retained within therein. Prior to consuming the product, the packaging support is removed. The invention also relates to a method and apparatus that includes a specially designed nozzle for producing the edible fat-based shell.

The invention relates to a water-based drilling fluid for low-temperature formation drilling. The technical solution of the invention is that the water-based drilling fluid is prepared with the following components in parts by weight: 100 parts of water, 0 to 4 parts of mixing soil, 0.1 to 5 parts of flow pattern regulator, 1 to 8 parts of shale inhibitor, 0.05 to 0.5 parts of encapsulating and inhibiting agent, 3 to 10 parts of filtrate reducer, 10 to 40 parts of hydrate inhibitor, 1 to 2 parts of lubricant and 0 to 100 parts of barite. The water-based drilling fluid has the following advantages: (1) the drilling fluid disclosed by the invention has good fluidity under the low temperature of negative 5DEG C, the plastic viscosity is less than or equal to 40mPa.s, and the yield point is less than or equal to 25Pa; (2) the drilling fluid disclosed by the invention has good borehole wall stability and filtration and wall-building properties, the swelling rate of clay can be deceased by about 70 to 90 percent, and the highest shale recovery ratio reaches 88.2 percent (21.1 percent for clean water); the API filtration loss is less than or equal to 5mL; (3) the drilling fluid disclosed by the invention has good hydrate inhibition property, and no hydrate is produced after the drilling fluid is mixed for 16 hours under the conditions of negative 5DEG C and 15MPa; (4) the lubricating coefficient of the drilling fluid disclosed by the invention is less than 0.1, which can meet the requirement of drilling operation.

The invention discloses a concrete viscosity regulator suitable for compatible use with a polycarboxylic acid water reducer and a preparation method thereof; the concrete viscosity regulator comprises the components by the weight percentage: 0.1%-10% of a clay stabilizer, 0.01%-5% of an air-entraining agent, 0.001%-5% of a foam stabilizer, 0.001-10% of a thickener, and 75%-99% of water. The preparation method comprises the steps: firstly, adding water to a stirrer, fully mixing evenly other components, starting up the stirrer, after running smoothly, slowly adding the materials, and thus obtaining the concrete viscosity regulator when the materials are fully dissolved and stirred evenly. With cooperative use of the prepared viscosity regulator with the polycarboxylic acid water reducer, the polycarboxylic acid water reducer can be promoted to be adsorbed on cement particle surfaces to form a water film lubrication layer, a cement slurry steric-hinerance effect and rheological properties (the cement slurry has low plastic viscosity and higher yield stress) are effectively increased, wrapping performance on aggregates is increased while the viscosity of the concrete slurry is reduced, and thus the concrete construction performance is improved.

The invention discloses a preparation method of a thickener used for self-compact concrete. The method comprises the following steps: 1, weighing 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid in proportion, processing to prepare an aqueous solution, and adjusting the pH value to 6.5-7.0; 2, adding a prepared monomer acrylamide solution with the concentration of 25-35% while stirring, uniformly stirring, dumping the obtained mixed solution into a flask, carrying out constant temperature water bath, and introducing nitrogen for protection; and 3, adding an initiator in a dropwise manner when the reaction temperature rises to 30-40DEG C, carrying out heat insulation at 40DEG C, carrying out a stirring reaction for about 1.5-2h, stopping the introduction of nitrogen when reactants are a viscous liquid, and carrying out constant temperature slaking for a period of time to obtain a white transparent colloid which is the thickener. The thickener obtained in the invention is used for preparing the self-compact concrete, has a good water solubility and a good thickening effect, can effectively improve the plastic viscosity of the self-compact concrete, and solves the water segregation and separation problems of the self-compact concrete.

The invention belongs to the technical field of concrete new material in traffic engineering, which particularly relates to a special modifying agent for self-compacting concrete of a high speed railway ballastless track. The special modifying agent is characterized in that the special modifying agent comprises the following components by proportion: 10 to 20 percent of nano silicon dioxide, 25 to 40 percent of modified metakaolin, 20 to 35 percent of ultrafine slag powder, 0.1 to 5 percent of thickening component, 1 to 10 percent of emulsion powder, 3 to 15 percent of zeolite powder, 1 to 3 percent of macromolecule water-absorbing resin, 0 to 1 percent of slow setting component and 10 to 20 percent of expansion component. The special modifying agent has the functions of improving workability and volume stability of self-compacting concrete, can improve the plastic viscosity of concrete mixture on the premise that the flowability of concrete is not reduced, inhibit bleeding and segregation, reduce the contraction distortion, and improve the crack resistance and the bonding strength of concrete.

The invention relates to a tackifying and shear strength improving agent and a preparation method thereof. The tackifying and shear strength improving agent disclosed by the invention is prepared through the steps of reacting dimeric fatty acid and polyethylene polyamine according to the molar ratio, namely 1: (0.4-1.6) of carboxyl to amino in the existence of triethylene glycol monobuthyl ether, wherein the reaction temperature is 140-160 DEG C; keeping the temperature until no water comes off, and then, further reacting for 10-20 minutes to finish the reaction; and removing water generated by the reaction while reacting. A soilless oil-based drilling fluid system with the tackifying and shear strength improving agent is good in suspension property, enhanced in solid-phase and stratum water pollution resistance, little in reservoir damage, increased in system permeability recovery value, stable in performance, strong in inhibiting property, good in lubricating property, low in plastic viscosity and high in temperature resistance up to 260 DEG C.

The invention relates to a low-temperature fresh-water-based fracturing diverting liquid used for coalbed gas and applications thereof. The content of a fluff agent is 0.2-0.5 g per 100 g of water. The content of a nucleating agent is 0.05-0.1 g per 100 g of water. The content of a film forming agent is 0.1-0.3 g per 100 g of water. The content of a ball layer agent is 1.5-1.7 g per 100 g of water. The content of a nucleating agent is 0.03-0.05 g per 100 g of water. The content of an inhibitor is 0.1-0.15 g per 100 g of water. The content of potassium chloride is 2-3 g per 100 g of water. The content of PAC is 0.3 g per 100 g of water. According to the fracturing diverting liquid, the density is 0.85-1.00 g/cm<3>, the pH value is 7-9, plastic viscosity is 45-60 mPa*s, the static seepage loss amount is not more than 10 mL/30 min, the dynamic seepage loss amount is not more than 10 mL/30 min, and the core return permeability is not less than 85%. The fracturing diverting liquid is suitable for well completion of coalbed gas stratums in the Qinshui area.

Among the methods provided is a method of drilling a subterranean well with an invert emulsion fluid comprising: providing an invert emulsion fluid formed by combining components that comprise: an oil-based continuous phase; an aqueous discontinuous phase; and a polar hydrophobic additive that comprises a polar hydrophobe, wherein the polar hydrophobic additive may substantially increases the yield point, the low-shear yield point, or both of the invert emulsion fluid relative to a fluid without a polar hydrophobic additive while limiting the change in the plastic viscosity to no more than about 35% of the change in the property with the largest increase; and placing the invert emulsion fluid in a subterranean formation.

A foam drilling fluid is prepared from, in percentage by mass, 2%-4% of a first foaming agent, 1%-2% of a second foaming agent, 1%-3% of inorganic fibers and the balance of water, wherein dosage of the first foaming agent is the double of that of the second foaming agent. Under the normal-temperature and normal-pressure conditions, the inorganic fibers are dispersed in deionized water for prehydration treatment for 8-12 h, then the first foaming agent and the second foaming agent are added and evenly stirred at 60-80 DEG C, the mixture is foamed at the rotating speed of 5,000-8,000 rpm for 3-5 min, and the foam drilling fluid is prepared. The foam drilling fluid has good foaming capacity, high high-temperature-resistant and anti-pollution capacity, good dynamic yield point, good yield point and plastic viscosity ratio, good suspension property, higher inhibitive ability and proper water loss, can maintain the higher rate of penetration and water and rock carrying capacity in the drilling process and effectively solves the complex problems of wellbore instability, tool sticking, reservoir pollution and the like.

The present invention relates to a method and apparatus for forming an edible fat-based shell upon a packaging support having a desired shape that defines a volume therein. One or more walls of consistent thickness are formed directly on the packaging support from an amount of an edible shell-forming composition. The composition includes one or more fats, and has a plastic viscosity of about 10 to 40 Poise and a yield value of about 50 to 250 dynes/cm² prior to forming the shell on the support. The walls of the edible fat-based shell preferably have the shape of a cup, cone, or other open top receptacle and a filling is at least partially retained within therein. The shells represent another embodiment of the invention. Prior to consuming the product, the packaging support is removed.

The invention discloses a preparation method of a wetting agent used for an oil-based drilling fluid. The method comprises the following steps: mixing and stirring vegetable oil fatty acid and maleic anhydride or fumaric acid or acrylic acid, heating the obtained mixture to 200-220 DEG C, carrying out a reaction for 2-4 h, and cooling the obtained reaction product to 130 DEG C; adding diethylenetriamine, and carrying out heating dehydration until no water is separated out at 260 DEG C; adding the vegetable oil fatty acid with the amount being 1.1-1.25 times the first-time addition amount of the vegetable oil fatty acid, heating the obtained mixture to 220 DEG C, and separating out water until no water can be separated out; and cooling the obtained material to 130 DEG C, adding xylene with the amount being 0.7 times the weight of the first-time addition amount of the vegetable oil fatty acid in order to realize dilution, and carrying out uniform stirring. The high-temperature and high-pressure filter loss of the oil-based drilling fluid using the wetting agent after 260 DEG C high temperature hot rolling for 16 h is 2.2-4.0 ml, the change of the apparent viscosity and the plastic viscosity before and after the hot rolling is small, the oil-based drilling fluid using the wetting agent has good rheological property and low plastic viscosity, facilitates the improvement of the mechanical drilling speed, and after the hot rolling, the emulsification stability is good, and the demulsification voltage is 1000 V or above.

The invention discloses a temperature-sensitive type polymer and a preparation method thereof. According to the preparation method of the polymer, reaction temperature is controlled and salt concentration, pH (Potential of Hydrogen) value and polymer concentration of a polymerization reaction solution are controlled to prepare the temperature-sensitive type polymer with different lower critical solution temperatures (LCST). The temperature-sensitive type polymer is used as a drilling fluid additive and can improve the low-temperature rheological property of water-based drilling fluid; the changes of the plastic viscosity and the apparent viscosity within a range of 0 to 60 DEG C are reduced by 50 percent. A preparation process of the temperature-sensitive type polymer is simple and feasible and the preparation efficiency is high; the temperature-sensitive type polymer has an excellent temperature-sensitive behavior in the deep-water water-based drilling fluid; the low-temperature rheological property of the water-based drilling fluid can be extremely improved, so that the preparation method of the temperature-sensitive type polymer and the temperature-sensitive type polymer prepared by the preparation method have actual application value in a petroleum industry, especially a deep-water well drilling field.

The invention discloses a flow type regulator for oil-based drilling fluid as well as a preparation method thereof. The flow type regulator is prepared by compounding composite modified organic soil and modified thermoplastic elastic resin according to a certain proportion, wherein the composite modified organic soil is formed by performing composite modification on sodium bentonite; and the modified thermoplastic elastic resin is formed by grafting glycidyl methacrylate (GMA) on thermoplastic elastic resin ABMS. Compared with the prior art, the flow type regulator for oil-based drilling fluid, which is provided by the invention, can improve the dynamic shearing force of the oil-based drilling fluid and improve the rheological property of the oil-based drilling fluid on the premise of notimproving the plastic viscosity obviously, and can enhance the suspending property and the rock debris carrying properties of the oil-based drilling fluid.

The invention relates to a viscosity modifying agent suitable for a 3D printing sulphoaluminate cement-based material, and belongs to the technical field of cement viscosity modifying agents. The viscosity modifying agent is prepared from the following components in parts by weight: 5-10 parts of polyethylene glycol, 20-40 parts of oxidized graphene, 10-20 parts of glycerine, 10-20 parts of waterreducing agents, 5-20 parts of starch, and 5-10 parts of quartz powder. The viscosity modifying agent can control the plastic viscosity of the 3D printing cement-based material within the range of 2.4-3.5 Pa.s, and the thixotropic property of the 3D printing sulphoaluminate cement-based material is greatly improved, and the stable control of a 3D printing structure is realized. In addition, the viscosity modifying agent can effectively regulate and control the rheological property of slurry and prolong the coagulation time so as to regulate the 3D printing time and improve the operability of the 3D printing cement-based material.