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 preparation method of an organic rheology modifying agent for full-oil-based drilling fluid. The preparation method comprises the following steps: 1) reacting polybasic fatty acid or ester of the polybasic fatty acid with hydroxyalkyl-substituted amine at 130 to 150 DEG C, wherein the hydroxyalkyl-substituted amine reacts with half of the carboxyl groups or carboxylic esters of the polybasic fatty acid or the ester of the polybasic fatty acid based on the rate of charge; and 2) reacting the reaction product in step 1) with organic polyamine at 150 to 170 DEG C, wherein the organic polyamine completely reacts with the amidation-free carboxyl or carboxylic ester in step 1) based on the rate of discharge. The organic rheology modifying agent prepared by the preparation method disclosed by the invention is in a gel structure with a certain strength, and can effectively improve the suspension property and thixotropy of the oil-based drilling fluid, thus the drilling liquid which is high in shear thinning performance and yield value, low in gel strength and low in plastic viscosity can be generated.

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 device and a method for testing the rheologic property of coal mine filling slurry. The device comprises an outer cylinder, an inner cylinder, a fixing plate, a torque sensor, bolts and a connecting rod; the inner cylinder is arranged inside the outer cylinder; grooves I are formed in the upper edge of the outer cylinder; the fixing plate and the grooves I in the opening of the outer cylinder are clamped mutually; a groove II is formed in the fixing plate; the opening of the inner cylinder is positioned in the arc-shaped groove II in the fixing plate; the torque sensor is arranged in a fixing clamping groove in the fixing plate, and connected with the fixing clamping groove through the bolts; a variable speed motor is arranged in the torque sensor; the upper end of the connecting rod are connected with a small-scale motor and the torque sensor; the lower end of the connecting rod is positioned in the middle of the inner cylinder; the length of the connecting rod is adjustable; a resistance piece is arranged at the lower end of the connecting rod, and is in contact with the slurry inside the inner cylinder. According to the device, through the resistance piece connected by using different ways, slurry rheologic parameters at different height positions can be measured at different speeds, so that the accurate measurement of the yield stress and the plastic viscosity of the slurry and the homogeneity assessment on the slurry can be realized.

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 stable multiple phase emulsion of the O1 / W / O2 type with high proportions of the primary O1 / W emulsion. The new emulsions have an emulsifier-free primary oil-in-water phase consisting of a viscoplastic aqueous gel containing the finely distributed inner oil droplets together with a gelling agent, wherein the thixotropic primary oil-in-water phase has a yield point in the range from 20 to 100 Pa and a plastic viscosity of 0.01 to 0.1 Paxs and contains at least one lipophilic agent in the primary oil; and a secondary oil phase in which the primary oil-in-water phase is present together with a lipophilic emulsifier; and wherein the proportion of the inner oily phase is from 10 to 35 % by weight relative to the total weight of the emulsion. The higher proportions of the inner oily phase render possible higher proportions of organic sun protection agents with simultaneous avoidance of skin irritations.

A wellbore servicing composition comprising a metal oxide, a soluble salt and a viscosifier wherein the viscosifier comprises a quaternary amide, a quaternary amide ester, or combinations thereof. A wellbore servicing composition comprising magnesium oxide, a chloride or phosphate salt and a quaternary material. A wellbore servicing composition comprising magnesium oxide, magnesium chloride, and a quaternary material wherein the quaternary material comprises a quaternary amide, a quaternary amide ester or combinations thereof and wherein the quaternary material is present in an amount of from about 0.05 wt. % to about 5 wt. % and a plot of the composition's plastic viscosity as a function of the amount of quaternary material is about linear.

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.

The invention discloses a low air-entraining viscosity reducing polycarboxylic water reducer which is formed by free radical polymerization of an alkyl phosphotriester mixture, TPEG and unsaturated carboxylic acid under the action of an initiator and a chain transfer agent. By introducing an alkyl phosphotriester monomer containing two double bonds to a main chain, molecules of the obtained polycarboxylic water reducer are of heterocyclic multibranched structures, so that the thickness of a polycarboxylic water reducer adsorption layer is increased, the plastic viscosity of concrete can be remarkably reduced, and meanwhile, by introducing the phosphotriester structure into the molecules of the polycarboxylic water reducer, the foaming property of the obtained polycarboxylic water reducer can be effectively improved and the air entraining property thereof can be reduced. The low air-entraining viscosity reducing polycarboxylic water reducer prepared by the invention is low in dosage and high in water reducer rate, the air entraining property of the low air-entraining viscosity reducing polycarboxylic water reducer can be reduced, the strength and durability of the concrete are improved while the viscosity of high grade concrete is remarkably reduced, and the raw materials are low in cost, the reaction condition is mild, and the low air-entraining viscosity reducing polycarboxylic water reducer is suitable for being popularized and applied.

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 invention provides an invert-emulsion drilling fluid, which comprises basic oil, brine, an emulsifier, a wetting agent, lipophilic colloid, a fluid loss additive, a shearing potentiator, an alkalinity conditioning agent, and a weighting agent. The invert-emulsion drilling fluid has the characteristics of low funnel viscosity and plasticity viscosity, and high dynamic shearing force and static shearing force; the yield point / plastic viscosity ratio is more than or equal to 0.30, the drilling fluid can sustain a temperature as high as 200 DEG C, so the drilling fluid is suitable for being used in a high temperature deep well, and a plurality of oils such as diesel oil, white oil, gas-liquefied oil, and the like can be used to carry out construction. Solved are the technical problems that the funnel viscosity and plasticity viscosity of the conventional invert-emulsion drilling fluid system are too high, and the dynamic shearing force and the static shearing force are too low.

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 relates to a site construction preparation method for a coal bed methane fuzzy-ball drilling fluid. The site construction preparation method comprises the following steps: sequentially adding 5-8 parts by weight of a ball-fuzzy agent, 2-5 parts by weight of a ball mass agent and 1-2 parts of a ball containing agent into 400 parts by weight of clear water, and continually performing stirring for at least 30 min to obtain a fuzzy-ball drilling fluid; utilizing a liquid densimeter to measure the density value of the fuzzy-ball drilling fluid, and utilizing a six-speed rotary viscometer to measure the fuzzy-ball drilling fluid so as to obtain the apparent viscosity, the plastic viscosity, the yield value and the dynamic shear force ratio and to obtain the coal bed methane fuzzy-ball drilling fluid. The invention aims to provide the site construction preparation method for the coal bed methane fuzzy-ball drilling fluid, which is simple in site construction, low in formation damage, good in coal bed well wall stabilizing effect and strong in leakage prevention and control capability and can effectively solve the problems of severe coal bed collapse, much loss of the drilling fluid and the like in the coal bed gas drilling operation process.

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 relates to a plugging agent for high-sulfur-content gas wells, belonging to the technical field of chemical products for water plugging and channel sealing in oil-gas wells. The plugging agent for high-sulfur-content gas wells is prepared by mixing the following components in percentage by mass: 40-55% of high-sulfur-resistance Grade-G cement, 13-18% of silicon powder, 1.5-3% of micro silicon, 8-11% of carboxylated styrene-butadiene latex, 0.1-0.3% of defoaming agent, 1.5-3% of stabilizer, 1-2.2% of expanding agent, 1-2.2% of dispersing agent, 1.5-2.2% of retarder and 17.4-18.1% of water. The plastic viscosity of the plugging agent at 89 DEG C is 20 mPa.s or below, so the plugging agent can be smoothly pumped into the downhole through a continuous oil pipe in the high-sulfur-content gas well; and the compression strength before and after the set cement corrosion of the plugging agent is respectively greater than 25 MPa, the permeability before and after the corrosion is respectively less than 1.2*10<-6> mu m<2>, and thus, the plugging agent implements long-term residence in the stratum and satisfies the requirements for water plugging for high-sulfur-content gas wells.

The invention discloses a method used for measuring cement mortar rheological parameters. According to the method, mortar plastic viscosity mu and yield stress tau<0> are calculated based on a formula 1 and a formula 2 respectively; dispersion degree K is measured via a method disclosed in GB 50119-2013 <concrete additive application technical standards>; the total time T<total> of 800ml cement mortar falling is measured via following steps: the outlet of a funnel is blocked firstly, 1000ml of mortar is prepared via stirring, and is delivered into an upper loading barrel, then the outlet is unblocked so as to realize free falling of the mortar into a lower material receiving measuring cylinder, and the total time T<total> of 800ml cement mortar falling is recorded using a second chronograph. According to the method, no DV is needed to record the whole experiment process; data processing is simplified; detection results can be obtained conveniently and rapidly; and it is more beneficial for popularization and application in engineering field. The measuring results of the method are not influenced by the size of sand particles of mortar; mortar using amount of each time is small; and both manpower and material resources are saved.

The invention specifically relates to an additive composition applicable to viscosity reduction of an oil-based drilling fluid and application thereof, and the oil-based drilling fluid and application thereof. The additive composition is a double block copolymer which is composed of a block A and a block B, wherein the block A is composed of a constitutional unit as shown in a formula (1) which is described in the specification and has a number-average molecular weight of 1500 to 10000, and the block B is composed of a constitutional unit as shown in a formula (2) which is described in the specification. The double block copolymer can be used as a viscosity reducer for the oil-based drilling fluid, especially as a viscosity reducer for a high-density clay-free oil-based drilling fluid; and the double block copolymer can greatly reduce the apparent viscosity and plastic viscosity of the oil-based drilling fluid in high-temperature high-pressure strata while guaranteeing proper shearing force, so drilling speed can be conveniently accelerated and difficulty in well drilling can be reduced.

The invention discloses a modified polymer acids shear-enhancing agent for oil-based drilling fluids and a preparation method thereof. The modified polymer acids shear-enhancing agent for oil-based drilling fluids is composed of the following ingredients: polymer acids, polyethylene-polyamine and primary amine, wherein molar ratio of polymer acids to polyethylene-polyamine monomer is 1.8-2:0.9-1.1; and molar weight of primary amine is the same as molar weight of the polyethylene-polyamine monomer. The Modified polymer acids shear-enhancing agent for high-temperature oil-based drilling fluids is formed by a dehydration polycondensation reaction. The shear-enhancing agent belongs to a low-molecular-weight polymer shear-enhancing agent, and has strong shear-enhancing ability. By the use of the shear-enhancing agent, plastic viscosity is not affected, and ratio of dynamic shear force of drilling fluids can be effectively raised. A stable molecular structure also endows the shear-enhancing agent with strong high temperature resistance.

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.