85results about How to "Shear resistant" patented technology

The invention provides association-type non-crosslinking fracturing fluid and a preparation method thereof. The association-type non-crosslinking fracturing fluid is prepared from hydrophobic modified partial hydrolytic polyacrylamide and derivatives of the hydrophobic modified partial hydrolytic polyacrylamide serving as active ingredients, a gel breaker, potassium chloride, an optional surface active agent and water, wherein each of the molecular structures of the hydrophobic modified partial hydrolytic polyacrylamide and the derivatives of the hydrophobic modified partial hydrolytic polyacrylamide contains acrylamide monomer unit, at least one biparental unsaturated monomer unit and at least one an anion alkene unsaturated monomer unit. As the molecular structure of a thickening agent contains a biparental monomer unit, a reversible super-molecule network can be formed in an aqueous solution through intermolecular hydrophobic association, and the high viscosity and the suspending power required by the fracturing fluid can be obtained without needing chemical crosslinking. The association-type non-crosslinking fracturing fluid based on the thickening agent has the characteristics of simple composition, low residue content, low damage, low friction, shear resistance, temperature resistance and salt resistance and can turn into a new generation of fracturing fluid system for replacing guanidine gum and fracturing fluid thereof.

The invention discloses a high-temperature-resistant polymer thickening agent for an oil field fracturing fluid as well as a preparation method and application of the thickening agent. The preparation method of the thickening agent comprises the following step: polymerizing acrylamide, other olefin monomers, an initiating agent and a chain transfer agent in an aqueous solution by virtue of a solution process, wherein the weight ratio of acrylamide to the other olefin monomers to water is (10-20):(6-18):(62-84); and the other olefin monomers are selected from one or more, preferably two or three, of anionic olefin monomers, cationic olefin monomers or non-ionic olefin monomers. According to the high-temperature-resistant polymer thickening agent disclosed by the invention, free radicals are generated by using an aqueous solution catalyst process so as to ensure that the monomers are subjected to ternary polymerization or quaternary polymerization to form the anionic high molecular polyacrylamide polymer with the molecular weight of 4,000,000-8,500,000. After the thickening agent is crosslinked with a crosslinking agent, the thickening agent can be used for tolerating high temperature of more than 210 DEG C, and has the advantages of good crosslinked gel elasticity, strong sand carrying capacity, anti-shearing performance, salt resistance, no residues and the like.

The invention discloses a thickener of water-based breakdown fluid, which is polymerized by acrylamide monomer and other olefin monomer through interval method, wherein the interval method puts allocated monomer into reacting container, which is heat to polymerize through catalyzing, heating by microwave and irradiating by ultraviolet.

The invention belongs to instant guar gum and a preparation method thereof. The instant guar gum is prepared from the following raw materials in parts by weight: 20-80 parts of guar gum raw powder, 10-25 parts of propylene oxide, 4-10 parts of chloroacetic acid, 5-10 parts of hydrochloric acid with mass concentration of 20 percent, 150-200 parts of solvent alcohol, 8-20 parts of alkali liquor with concentration of 10 percent, 150-200 parts of water, 20-50 parts of hydrophobic modification material and 1000 parts of washing medium, wherein the solvent alcohol is any one of methanol, ethanol, ethylene glycol or isopropyl alcohol; the hydrophobic modification material is any one of bromododecane, bromohexadecane or bromooctadecane; the washing medium is any one of isopropyl alcohol, methanol or ethanol. According to the instant guar gum and the preparation method thereof, a step of taking hydroxypropyl guar gum out in oil field fracturing construction is not needed, a reaction process is saved, and pollution and waste caused by post-treatment of the reaction process are reduced.

The present invention provides an instant water-in-oil resistance-reducing agent and a preparation method thereof. The resistance-reducing agent is synthesized by inverse emulsion polymerization. In particular, the preparation method comprises the steps of dissolving a water-soluble monomer into an aqueous phase; dispersing the monomer into a nonpolar liquid to form a water-in-oil emulsion by an emulsifier while stirring, wherein an initiator performs initiation to carry out a polymerization reaction; basic composition of an aqueous phase is acrylamide, methacrylate and 2-acrylamide-2-methylpropanesulfonic acid; and basic composition of an oil phase is white oil and a mixed surfactant. The water-in-oil resistance-reducing agent synthesized by the preparation method is an ivory emulsion liquid which is a high molecular polymer; the agent has good stability and a certain degree of fluidity, and can be directly used and rapidly dissolved in water. By using the resistance-reducing agent to prepare a slippery water fracturing fluid, the agent has the characteristics of small dosage, high temperature resistance, salt resistance and shearing resistance; the agent is suitable for an online continuous mixing technological process; the resistance-reducing rate can reach 69.6%; and damage to a reservoir is very low.

The invention relates to an autoslack remigration pearlgel water plugging control agent which belongs to oil-field injection well water plugging control agent. The chemical water plugging control agent applied to effectively control the contained water when the oil field enters the middle-late phase, has come into the phase of large-dose deep water plugging control. The performance of gel deep water-plugging control agent of chromium gel/complex-ion polymer/resin used in present technology is more excellent than common polyacrylamides gel and acrylamide monomer gel, but the lower remigration, high-deformability and delayed crosslinking can not satify the requirements, so the invention obtains the glue by adopting salt resistance polymer, temperature-resistance polypropeneamino solution with concentration of 0.05-0.4 %, 0.02-0.2 % flocculant, 0.2-0.8 % modified mylar crosslinker, and 0.01-0.1 % cellulose ether disperser, with 60-90 DEG reaction temperature of the prepared solution and 7.2-8.0 of pH value. The gel can be remigrated, have properties of dilatability, high viscoelasticity and delayed crosslinking, and the intensity can be adjusted. The said glue can form gel when injected into the well for 5-7 days, then the gel breaks up after 30 days and remigrates to the deep ground layer to plug the ground layer.

The present invention discloses a photo-stabilization type lubricating grease, which comprises, by weight, 75-92 parts of a base oil, 5-20 parts of a fatty acid soap thickener, 0.1-2 parts of an antioxidant, 0.01-2 parts of a light stabilizer, and 0.1-2 parts of an anti-rust agent, wherein the components are matched under a certain condition according to the ratio to obtain the photo-stabilization type lubricating grease. According to the present invention, the added functional additive does not affect the product structure, wherein the specific performance is that the consistency (cone penetration) and the strength limit of the product are not changed significantly; and with the addition of the light stabilizer, the photo-stabilization type lubricating grease of the present invention has the light stability, wherein the appearance of the lubricating grease is essentially the same before and after the illumination, and the product meets a variety of lubricating requirements.

The invention discloses a preparation method of composite modified starch. The preparation method comprises the following steps: (1) blending a starch slurry: uniformly stirring water, an expansion inhibitor and native starch to obtain the starch slurry; (2) performing an etherification reaction: adding an etherifying agent to carry out the etherification reaction; (3) performing a crosslinking reaction: adding a crosslinking agent, and carrying out the reaction to reach a desired viscosity; (4) adjusting the pH value of a reaction solution obtained after the crosslinking reaction in step (3)with an inorganic acid solution, adding an esterification agent, carrying out a reaction for 3 h, and then terminating the reaction to obtain the composite modified starch; ad (5) washing and dehydrating the composite modified starch prepared in step (4), and carrying out drum drying to obtain the product. The composite modified starch of the invention is obtained by etherification, the crosslinking reaction and the esterification reaction of the native starch, and the single product can meet the application requirements without being combined with other starches. The preparation method of thecomposite modified starch of the invention has the advantages of easily controlled process conditions, easiness in realization of large-scale industrial production, easiness in operation, and strongpracticability.

The invention discloses a forming construction method of a long-spiral pore-forming pile-slab-pile supporting and anti-seepage continuous wall. The continuous wall is formed in a manner that a long-spiral drilling high-pressure jetting cemented soil composite concrete pile slab composite pile is taken as a construction main body and pile-slab-pile crossed construction and combination in different sequences is carried out. The forming construction method comprises the following steps that Step one, construction preparation is carried out; Step two, pile foundation construction and pore-forming are carried out, high-pressure jetting cement paste slab forming hole construction, and press grouting pile slab concrete construction are carried out, concrete is subjected to press grouting to reach the elevation of a pile top, then first plain concrete pile slab construction is accomplished; Step three, a second plain concrete pile slab is coaxially connected and constructed according to a designed pile space, and after second plain concrete pile slab construction is accomplished, the construction of a pile-slab-pile supporting and anti-seepage continuous wall structural unit is accomplished; and Step four, the pile slab construction of the next unit is carried out according to the operational procedures above, then the complete pile-slab-pile supporting and anti-seepage continuous wall is formed. According to the forming construction method of the long-spiral pore-forming pile-slab-pile supporting and anti-seepage continuous wall, stand-alone construction is realized, the equipment investment is low, the energy consumption is low, and the cost is saved.

The invention relates to a densifier for aqueous fracturing fluid and a preparation method thereof. The densifier for aqueous fracturing fluid comprises the following components in parts by weight: 15-25 parts of acrylamide, 5-10 parts of methacrylamide, 30-80 parts of sodium 2-acrylamide-2-methylacrylsulfonate, 5-10 parts of acrylic acid, 0.1-1 part of complexing agent, 0.1-1 part of chain transfer agent, 0.1-1 part of initiator, and 20-50 parts of deionized water. The densifier for aqueous fracturing fluid prepared by the method does not need purifying, and has a simple preparation technology. The densifier has good solubility and high shear resistance. The aqueous fracturing fluid prepared by the densifier has good sand carrying capacity, has less harm to the bottom layer, has no residues, and can be used as a substitute for sesbania gum and guar gum.

The invention discloses a nano-composite initiator which comprises at least one of composite compounds as shown in a formula I in the specification. The invention further discloses a thickening agent for the fracturing fluid, and application of the thickening agent in preparation of the fracturing fluid, wherein the raw materials of the thickening agent comprise the nano-composite initiator. The thickening agent for the fracturing fluid provided by the invention has the characteristics of rapid dissolution, high temperature resistance and good sand-carrying property, can form a high-temperature fracturing fluid system which is efficient in performance and convenient to use on site, and can meet the application requirements of a large-scale hydraulic fracturing construction process.

The invention discloses a rotating speed control device for a turbogenerator based on a magnetorheological material and a control method and belongs to the field of rotating speed control of fuze turbogenerators. The rotating speed control device for the turbogenerator based on the magnetorheological material comprises an upper cover, an internal cylinder, a shell, a base, a magnet exciting coil and the magnetorheological material. A pedestal is formed by the upper cover, the internal cylinder, the shell and the base. The internal cylinder is filled with the magnetorheological material which is used as an actuating element for rotating speed control. The upper cover, the shell and the base are all made of metal magnetic conductive materials. The internal cylinder is made of a non-magnetic conductive material. The invention also discloses a rotating speed control method based on negative voltage feedback for controlling the rotating speed control device for the turbogenerator based on the magnetorheological material. According to the device and the method, the rotating speed control of the fuze turbogenerator can be realized, and the device and the method have the following advantages that (1) the influence of the rotating speed control device on the rotating speed of the turbogenerator at a low wind speed section is reduced; and (2) the stability of the structure of the turbogenerator at a high wind speed section is improved.

The invention discloses a grout injection type waterproof high-viscoelasticity modified asphalt pavement mixture and a preparation method thereof. The grout injection type waterproof high-viscoelasticity modified asphalt pavement mixture comprises a matrix asphalt mixture and a grouting material, wherein the matrix asphalt mixture is filled with the grouting material. The matrix asphalt mixture is a skeleton-gap type high-viscoelasticity modified asphalt mixture which is compacted to have the gap rate of 18%-22%, and the skeleton-gap type high-viscoelasticity modified asphalt mixture is prepared from, by weight, 100 parts of aggregate, 4.2-5.2 parts of high-viscoelasticity modified asphalt and 3.7-4.7 parts of filler; the grouting material is prepared from, by weight, 100 parts of grout injection material and 34-36 parts of water, and the grout injection material is a high-elasticity-modulus nanometer grouting material.

The invention relates to application of sclerotium rolfsii scleroglucan fermentation broth as an oil field drilling fluid treatment agent. The sclerotium rolfsii scleroglucan fermentation broth can be used in a stratum environment with a temperature of less than 130 DEG C, a mineralization degree of less than 20000 mg/L, and a pH value in a range of 1-12, overcomes adverse factors that current biopolymer products are poor in temperature resistance and easy to be influenced by the mineralization degree and the pH value of stratum, and is wider in application range, and stronger in capacity of resisting harsh stratum conditions.

The invention discloses an inspection chamber peripheral backfilling method and application thereof and relates to the technical field of municipal road construction. The inspection chamber peripheralbackfilling method comprises the steps of adding a geogrid per backfilling of 40-70 cm thick backfilling material, and repeating until backing filling is complete. The technical problem is alleviatedthat driving comfort and safety of a vehicle on a road are affected by high proneness of inspection chamber periphery to settling 1 to 2 years after construction of inspection chamber peripheral backfilling, which is due to the reasons that, for instance, compactness decreases, excavation depth of the inspection chamber is too great, and the construction period is unable to wait for natural settling occurred after foundation pit backfilling. Geogrids are added during backfilling, so that strength and overall stability of terrain at the periphery of the inspection chamber are improved, soil settling around the inspection chamber is controlled, road pavement flatness is guaranteed, and driving comfort and safety of a vehicle on a road are improved.

The invention relates to the field of buildings and civil engineering, in particular to a flexible base layer bituminous road surface. The problem that in the relative technology, the road condition quality is poor is solved. The flexible base layer bituminous road surface comprises a surface layer, a base layer, a cushion layer and an earth base which are sequentially arranged from top to bottom. The surface layer comprises a bituminous concrete surface layer body, a bituminous macadam surface layer body and a bituminous injecting gravel surface layer body; the base layer is at least formed by evenly mixing a bituminous mixture, bituminous injecting macadam and ABS particles; the cushion layer comprises a grading macadam layer body which forms a dense structure by mixing macadam of different particle diameters and being subjected to compaction; the thickness of the flexible base layer bituminous road surface is gradually reduced in the direction from the middle of the flexible base layer bituminous road surface to the two sides in the width direction; and the flexible base layer bituminous road surface further comprises first reinforcing column bodies, first unchoking pipes and second unchoking pipes, wherein the first reinforcing column bodies and the first unchoking pipes are arranged between the earth base and the cushion layer, and the second unchoking pipes are arranged on the base layer. The flexible base layer bituminous road surface can be well used under the long-time and high-load condition.

The invention discloses a preparation method for sago starch modified by xanthan gum, relating to a preparation method for starch, and solving the problems of bad shear capability and acid-resisting capability, and insolubility in cold water, of the present sago starch. The preparation method comprises the following specific steps of: (1) pouring 50 g of xanthan gum in 6000 g of pure water, and rapidly stirring for 10-15 minutes to form a uniform system; (2) adding 5000 g of sago starch in the xanthan gum uniformly dispersed system, and stirring to dissolve; and (3) performing a pre-gelatinization procedure on the solution above in conditions comprising a starch concentration of 14-14.5 Baume degrees, a pipeline pressure of 6.5-7.0 kg, and a rotational speed of 600 r/m, crushing and sieving, and then obtaining the finished product. The modified sago starch produced by the method disclosed by the invention has the properties of being soluble in cold water, shear-resistant, acid-resistant, etc. The preparation method disclosed by the invention is applied to the fields of food, medicine and cosmetic.

The invention discloses a drag reducer for fracturing and a preparation method thereof. The drag reducer for fracturing consists of, in percentage by mass, 10%-30% of a water-soluble monomer, 5%-35% of water, 30%-65% of base oil, 5%-30% of an emulsifier, 1%-3% of an electrolyte with a salting-out effect and 0.001%-0.1% of an initiator. Under the initiation of the initiator, a water-in-oil system formed by an aqueous phase solution and an oil phase solution is subjected to a reversed-phase microemulsion polymerization reaction. According to the invention, the drag reducer for a fracturing fluidis synthesized by adopting a reversed-phase emulsion polymerization mode; the fracturing fluid is a water-soluble polymer with a small amount of hydrophobic groups on a hydrophilic macromolecular chain, and the solution has special thickening and shearing-resistant effects due to the specific amphiphilic molecular structure of the fracturing fluid; and the drag reducer has the advantages of highdrag reduction rate, strong compatibility, shearing resistance, low friction resistance, low damage and wide application range.

The invention relates to a digital video watermarking method based on one-dimensional wavelet transform, belonging to the technical fields of video signal processing and multimedia signal processing, and comprising the steps: 1) watermarked image preprocessing, adopting a scrambling conversion technique to disarrange the space positions of pixels, leading videos loaded with watermark to have shearing capability, and strengthening the security of a watermarking algorithm; 2) one-dimensional wavelet transform, taking two continuous frames from an original video sequence to carry out one-dimensional wavelet transform; 3) embedding watermark, embedding watermark into each branch block with low frequency frame obtained in the step (1), and realizing the real-time embedding of the watermark; and 4) detecting watermark, taking two continuous frames from the watermark to be detected to carry out one-dimensional wavelet transform, carrying out block dividing operation to the obtained low frequency frames, and conducting watermark extraction according to an embedded algorithm. In the invention, the complexity of embedding and extracting watermarks is greatly reduced, and the embedding and the extraction of the watermarks can be carried out in real time, the efficiency is improved, and simultaneously the attack to the frame rearrangement has obvious robustness.

The invention relates to an additive and a method for improving the anti-shearing performance of an alcohol-base crude oil drag-reducing agent. The method comprises the following preparation steps of: 1, slowly adding titanate into a breaker containing butyl cellosolve or isooctyl alcohol, and completely mixing the materials; 2, continuously adding nonionic surfactants into the breaker, and stirring the materials for use; 3, adding anionic surfactants into the solution in the second step, and stirring the materials for use; 4, adding zwitterionic surfactants into the solution in the third step, and performing stirring to obtain the additive provided by the invention. The additive has the beneficial effects that the mutual effects between polymers and anti-shearing auxiliary agent molecules, auxiliary agent molecules, the auxiliary agent molecules and alcohol are used for solving the problem of irreversible degradation of macromolecular chains under the shearing effect. The additive provided by the invention has the advantages that the rigidity of polymer molecular chains is enhanced through the micelle reversible change and molecular entanglement effect, the anti-shearing performance of the crude oil drag-reducing agent is effectively improved, and the injection application cost is reduced.