25 results about "Drag reducing agent" patented technology

The application discloses a polymer drag-reducing agent injection type hydrofoil, and belongs to the technical field of polymer drag-reducing agents of underwater vehicles. The application solves the problem that there is no drag-reducing agent injection structure capable of stably outputting polymer drag-reducing agents and capable of adhering to the surface of a drag-reducing part of an underwater vehicle. One end of a steady flow cavity is communicated with a solution storage box in the underwater vehicle through a discharge channel, a cover plate is parallel and slidingly inserted on a main body of the hydrofoil, the lower surface of the cover plate is adhered to the upper surfaces of a plurality of fairing plates, and the outer surface of one end of the cover plate and the inner wall surface of one end of the steady flow cavity form an injection channel. The steady flow cavity has a steady flow effect on the solution, so that the stable output of the polymer solution is realized; the flow state of the polymer solution is adjusted through the fairing plates, so that the polymer solution flows stably; the polymer solution flows out to the surface of the hydrofoil through the injection channel, the frictional resistance generated during sailing is reduced, and the sailing performance of the underwater vehicle is improved.

The application relates to the field of turbulent flow control in fluid mechanics and discloses a natural gas drag-reducing agent atomization injection indoor circulation system. The system is composed of a natural gas drag-reducing agent atomization device and an indoor circulation pipeline; the natural gas drag-reducing agent atomization device comprises a shell, a conical jet cylinder and a gas-liquid mixing cavity; a conical jet cylinder and a nozzle are arranged in the shell; the nozzle can be automatically adjusted within an angle range of 20-80 degrees according to the natural gas conveying flow; a blade support plate cuts the mixed drag-reducing agent to atomize the drag-reducing agent again; the particle size of the atomized drag-reducing agent ranges from 20 to 40 microns; square magnet blocks are evenly arranged on the outer wall of the indoor circulation pipeline; the number of the square magnet blocks is 114; the length of each square magnet block is 200 mm, the width is 80 mm, and the thickness is 50 mm. The application utilizes the comprehensive effect of jet flow, cutting and electromagnetic field to enhance the atomization and adhesion effect of the drag-reducing agent; the drag-reducing effect of the drag-reducing agent atomization injection is evaluated based on control variables; and the result can be applied to the drag-reducing conveying of a natural gas long-distance pipeline.

This invention relates to the field of cement slurry technology for oil and gas field cementing, and discloses a low-friction, salt-resistant, high-density oil well cement slurry and its preparation method. The low-friction, salt-resistant, high-density oil well cement slurry comprises the following components, added per 100 parts by weight of cement: 35-110 parts weighting agent, 0-15 parts fine aggregate, 1.5-5 parts fluid loss reducing agent, 0-1 part retarder, 0.5-3 parts drag reducing agent, and 0.2-0.6 parts defoamer; the density is 2.0-2.10 g / cm³. 3 The salt-resistant, low-temperature, anti-channeling, and tough cement slurry provided by this invention is based on a low-friction, high-density cement slurry system with iron ore powder weighting. The thickening time is adjustable, and the overall performance is good. It can maintain good performance under high temperature, high pressure, and high salt conditions.

The application discloses an antifouling and antibacterial drag reduction agent and a preparation method and application thereof. The antifouling and antibacterial drag reduction agent comprises double-charge modified organic nanoparticles, nanocarbon materials and polydimethylsiloxane, and is prepared through the following steps: providing double-charge modified organic nanoparticles; dispersing the double-charge modified organic nanoparticles and the nanocarbon materials in a mixed solvent to obtain a nanosolution; mixing the nanosolution with polydimethylsiloxane and fully stirring to obtain the antifouling and antibacterial drag reduction agent. The organic nanoparticles and the nanocarbon materials are cooperated to generate a multi-level nanostructure, and the multi-level nanostructure is cooperated with low-surface-energy polydimethylsiloxane to form super-hydrophobic nanomaterial, so that the drag reduction performance is improved, and the double-charge groups on the surface of the organic nanoparticles have antifouling and antibacterial effects.

The application discloses slick water and a preparation method thereof, and belongs to the technical field of downhole working fluid. Raw materials for preparing the slick water include modified nano silicon dioxide 1-3 parts by weight, a drag reduction agent 0.05-0.2 parts by weight, a fluorine-containing surfactant 0.01-0.02 parts by weight, a cleanup agent 0.01-0.05 parts by weight, a clay stabilizer 0.1-0.5 parts by weight and water 100-110 parts by weight. The provided slick water has good reservoir protection and reservoir wetting reverse characteristics by using modified nano silicon dioxide, long-branched polyacrylamide, the fluorine-containing surfactant and other additives. The application is suitable for slick water fracturing systems of hydraulic fracturing.

The present application relates to the technical field of foam cementing of oil and gas wells, and discloses a carbon dioxide corrosion-resistant foam cement slurry and a preparation method thereof. The raw material composition comprises cement, siliceous material, corrosion-resistant material, toughening and expanding material, fluid loss additive, retarder, drag reducing agent, foaming agent, foam stabilizer and water in terms of mass parts. The required amount of cement, siliceous material and corrosion-resistant material is mixed to obtain a solid phase material. The required amount of water is added with the fluid loss additive, retarder and drag reducing agent in sequence, and stirred respectively. Then, the foaming agent and foam stabilizer are added in sequence, and stirred uniformly to obtain a slurry preparation liquid. Finally, the solid phase material is added into the slurry preparation liquid and stirred to obtain the carbon dioxide corrosion-resistant foam cement slurry. The present application can reduce the permeability of cement stone, reduce the corrosion channeling passage, improve the compressive strength, toughness, cementing strength and corrosion resistance of low-density cement stone, and realize efficient CO2 storage and cyclic reinjection, which is green and environmentally friendly.

This invention relates to the field of oilfield chemistry, and discloses a fracturing fluid drag-reducing agent composition, its preparation method, and its application. The drag-reducing agent composition comprises cis-15-tetracosenoic acid and a polymer; the polymer comprises polymer A and polymer B, polymer A comprising structural unit A from formula (1), and polymer B comprising structural unit B from formula (2); formula (1); formula (2); wherein R1 is substituted or unsubstituted C 12 -C 20 R1 is an alkyl group; R2 is an unsubstituted C1-C4 alkyl group; X is selected from positive integers from 6 to 14; R3 is H or a C1-C3 alkyl group. The drag-reducing agent composition can maintain drag-reducing performance and improve oil recovery over a wide temperature range.

The application provides a high-temperature and high-density cementing slurry and a preparation method thereof, which comprises the following components in parts by weight: 100 parts of oil well cement, 35-60 parts of silicon powder, 63-162 parts of weighting agent, 1-3 parts of microsilica, 3-6 parts of organic-inorganic grafted suspension stabilizer, 4-6 parts of fluid loss additive, 3-7 parts of retarder, 3-5 parts of drag reducing agent, 0.1-0.5 parts of defoaming agent and 58-67 parts of fresh water. The cementing slurry provided by the application can maintain good stability at 100-200 DEG C (BHCT, bottom hole circulating temperature), can effectively eliminate free fluid, does not affect cementing slurry preparation and cementing, has small fluid loss, and has a smooth thickening curve without core covering at high temperature, so that the cementing construction requirement can be met, and the application prospect is good.

This application relates to the field of petroleum extraction technology, specifically disclosing an ultrafine particle suspension and its preparation process. The ultrafine particle suspension comprises the following raw materials: anionic polyacrylamide, a compound co-solvent, sodium alkylnaphthalene sulfonate, thiourea, and water; the compound co-solvent is a complex of urea and acetamide. The ultrafine particle suspension obtained by this application has a minimum dissolution time of 30 seconds, improving the dissolution rate, and achieves a maximum viscosity retention rate and drag reduction rate of 96.0% and 83.9%, respectively, enhancing the dissolution effect. As a drag-reducing agent for fracturing, it not only has a high drag reduction rate but also a high dissolution rate and effect. Furthermore, after standing for 30 days, it exhibits good properties without stratification, demonstrating high stability. It can be used immediately upon collection, is easy to inject, and is suitable for drilling environments with limited space.

The utility model provides a kind of fracturing fluid mixing and preparing system, it is related to fracturing fluid mixing technical field, including vibrating screen and conveying mechanism, the vibrating screen has accommodating cavity and is equipped with the feed inlet and discharge port being communicated with the accommodating cavity, the accommodating cavity is used to accommodate material, the discharge port is at least two and interval arrangement in the outer circumferential surface of vibrating screen, and the discharge particle size of any two discharge ports is different;The conveying mechanism is used to convey storage cylinder, and the storage cylinder is used to contain material.The utility model can automatically screen drag-reducing agent and temporary plugging agent, to collect drag-reducing agent and temporary plugging agent of different particle size range, realize the convenient material preparation before fracturing fluid mixing, so different specifications of fracturing fluid preparation requirement can be satisfied.

The present application relates to the technical field of organic drag reducer optimization, and discloses a prediction method and system for the friction coefficient of an organic drag reducer, which fuses experimental data and predicted theoretical data as the reference output for the initial neural network model training, fully considers the molecular structure of the organic drag reducer, the structural properties of the organic drag reducer under external force, and the combination characteristics of the organic drag reducer and the surface coating, constructs the organic drag reducer-surface structure descriptor as the input for the model training, and guarantees the prediction accuracy of the target neural network training model; and then realizes high-throughput automatic prediction of the friction coefficient through the constructed target neural network training model, effectively improving the prediction efficiency of the friction coefficient of the organic drag reducer.

The invention discloses nano hydrophobic modified graphene oxide as well as a preparation method and application thereof, the nano hydrophobic modified graphene oxide comprises graphene oxide and a hydrophobic group grafted on the graphene oxide, and the hydrophobic group is derived from alkoxy silane; the mass ratio of the alkoxy silane to the graphene oxide is (10-12): 1. According to the invention, the hydrophobic group derived from alkoxy silane is grafted on the graphene oxide, so that the obtained nano hydrophobic modified graphene oxide has excellent adsorption performance, relatively strong water flow scouring resistance and relatively small blockage negative effect, and can be used as a nano drag reducer for low-permeability reservoirs to realize drag reduction and yield increase of oilfield exploitation.

This invention discloses a high-temperature resistant, viscosity-modifying integrated fracturing fluid drag-reducing agent and its preparation method. The drag-reducing agent comprises the following components by weight: 30-45 parts by weight of a thickener, 49-67 parts by weight of a suspension, 0.5-2.0 parts by weight of a demulsifier and drainage aid, and 1.0-3.0 parts by weight of a clay stabilizer. The thickener is polymerized from acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, sodium p-styrenesulfonate, and octadecyl methacrylate. The drag-reducing agent provided by this invention has a molecular structure based on the supramolecular aggregation principle, forming a high-molecular polymer containing a large number of strongly hydrophilic groups and a small number of hydrophobic carbon chains. Under low dosage conditions, the polymer exhibits a linear discrete distribution, resulting in a highly efficient drag-reducing effect. Under high dosage conditions, the polymer molecular chains form a highly viscoelastic three-dimensional network structure through hydrophobic association, thereby giving the fracturing fluid strong temperature and shear resistance and sand-suspending capacity.

The application relates to a salt-resistant non-plant glue powder drag-reducing agent and a preparation method and application thereof. The drag-reducing agent comprises acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, N-(4-hydroxy-3-methoxybenzyl) acrylamide, a functional monomer R and proper amount of water, and the mass fraction ratio of the acrylamide, the 2-acrylamide-2-methylpropanesulfonic acid, the N-(4-hydroxy-3-methoxybenzyl) acrylamide and the functional monomer R is 50-85:10-20:5-10:5-15. The designed drag-reducing agent is composed of the basic structure of polymer molecules by introducing the monomer with a sulfonic acid group and a rigid side group and acrylamide, and the existence of the functional monomer effectively improves the tackiness, temperature resistance and mineralization resistance of the polymer.

This invention relates to the field of polymer compound preparation technology, specifically to a multi-component copolymer, its preparation method, and its applications. The multi-component copolymer comprises a first structural unit derived from a first polymeric monomer and a second structural unit derived from a second polymeric monomer, with a molar ratio of the first to the second structural unit of 20-100:1. The first polymeric monomer is a water-soluble vinyl monomer, and the second polymeric monomer contains carbon-carbon double bonds and β-keto ester groups. This multi-component copolymer can be used as a drag-reducing agent, and during its use as a drag-reducing agent, it can achieve controlled degradation of the main chain under the temperature conditions of shallow and medium-depth shale oil reservoirs, degrading the macromolecular polymer into smaller molecular fragments and avoiding the blockage and damage to reservoir pore throats caused by polymer residues.

The application relates to the technical field of cement paste, and is an early-strength low-density fly ash multi-element multi-scale plugging cement paste and a preparation method thereof. The early-strength low-density fly ash multi-element multi-scale plugging cement paste raw material comprises G-grade oil well cement, fly ash, artificial glass microbeads, microsilica powder, a drag-reducing agent, a fluid loss reducer, a retarder, a defoaming agent, a reinforcing agent, water and a composite plugging agent. The early-strength low-density fly ash multi-element multi-scale plugging cement paste has a wide density range, a small density difference between upper and lower parts, good stability, high compressive strength, can significantly reduce the risk of collapse of a water-sensitive formation caused by immersion of filtrate, reduces damage to an oil and gas layer, can quickly form a solid plugging barrier, can meet the plugging operation requirements of low-pressure easy-leakage wells and malignant leakage wells, and improves plugging quality and efficiency.

The application relates to the technical field of reaction kettles, and discloses a drag-reducing agent production device for well cementing and a production method thereof. The drag-reducing agent production device comprises a production reaction kettle, a reaction inner tank coaxially and nested in the production reaction kettle, four auxiliary stirring mechanisms uniformly and fixedly arranged at the top of the production reaction kettle, the four auxiliary stirring mechanisms being rotationally symmetrically distributed along the axis of the production reaction kettle, the hoisting end of each auxiliary stirring mechanism being fixedly connected with the outer wall of the reaction inner tank, and a four-way dynamic hoisting support structure being formed; each auxiliary stirring mechanism comprises an external box, a winch motor assembly, a weight sensor, a winch reel and a hoisting cable group, the external box is fixedly arranged at the top outer side of the production reaction kettle, and the winch motor assembly and the weight sensor are fixedly installed in the external box; the four winch motor assemblies are controlled to alternately tighten the hoisting cable, so that the reaction inner tank is alternately tilted in multiple directions during stirring.

The implementations described herein generally refer to a drag-reducing agent (DRA) for improving the flow of crude oils with a high asphaltene content through pipelines. The DRA is a terpolymer with a glass transition temperature (Tg) of 6 degrees Celsius or lower. The terpolymer consists of a first monomer, a second monomer, and a third monomer. The first and second monomers are selected based on the glass transition temperatures of their corresponding homopolymers. The glass transition temperature of the homopolymer formed with the first monomer is at least 120 degrees Celsius higher than the glass transition temperature of the homopolymer formed with the second monomer. The DRA composed of the terpolymer formed with the second monomer produces softer, less solids due to the terpolymer's lower glass transition temperature.The pump handles softer solids more easily to keep the injection system clean.

The application relates to the technical field of petroleum additives, in particular to a shear-resistant crude oil drag reducer and a preparation method thereof. The shear-resistant crude oil drag reducer prepared by the application is a polymer with diphenylmethane 4,4'-diisocyanate, 2-(dimethylamino) ethyl acrylate, methylsulfonic acid-2-propargyl-1-alcohol, vinyl acetate, acryloyl chloride and methyl methacrylate as polymerization monomers. The polymer system has a hyperbranched structure by introducing a terminal hydroxyl polyether ester polyol. Compared with conventional crude oil drag reducers, the shear-resistant crude oil drag reducer has the advantages of strong shear resistance, low use concentration and better drag reduction effect. In addition, the preparation method adopts a solidification-first and hydrolysis-later process, and the product has stable performance.

The invention relates to the technical field of petroleum and geothermal energy development, in particular to thermal insulation cement paste suitable for a geothermal well and a preparation method and application of the thermal insulation cement paste. According to the cement paste, high-sulfate-resistance oil well cement with different granularities is adopted as a base material, an organic heat insulation material and a hollow heat insulation material are adopted as heat insulation materials, meanwhile, a reinforcing material, an admixture, a fluid loss agent, a retarder, a drag reducer and a defoaming agent are compounded, the density of the prepared cement paste is 1.80-1.90 g / cm < 3 >, the 48d compressive strength is larger than or equal to 30 MPa, and the heat conductivity coefficient is smaller than or equal to 0.5 W / (m.k). The thickening time is 120-300 min, the water loss is smaller than or equal to 50 mL, the geothermal well cementing requirement can be met, and the performance is more excellent.

This application provides a polymer brush, its preparation method, and its application in fluid drag reduction. The preparation method includes: preparation of an initiator layer; preparation of a PNIPAM brush: under a nitrogen atmosphere, N-isopropylacrylamide, pentamethyldiethylenetriamine, and acrylic acid are added to a mixed solvent of methanol and deionized water, and then cuprous bromide is added to obtain a polymerization reaction solution. A substrate material coated with an initiator layer is immersed in the polymerization reaction solution to perform a SI-ATRP reaction, and a PNIPAM brush is obtained on the surface of the substrate material. Preparation of a DM-PNIPAM brush: 4-dimethylaminobutamine and an activator are dissolved in N,N-dimethylformamide to obtain a modified solvent. The substrate material grafted with the PNIPAM brush is immersed in the modified solvent and reacted to obtain the polymer brush, i.e., the DM-PNIPAM brush. The polymer brush provided by this application improves its stability and durability as a drag-reducing agent in fluid drag reduction.

The application discloses a kind of hydrophobic drag reducer and preparation method thereof, belong to downhole working fluid technical field.Effective component of the raw material of the drag reducer made in the application, by weight fraction, includes: acrylamide 15~20 parts, acrylic acid 10~15 parts, 2-acrylamide-2-methylpropane sulfonic acid 2~3 parts, modified nanosilica 1~2 parts, initiator A 0.1~0.5 parts, chelating agent 0.5~1 parts, white oil 30~40 parts, sorbitan oleate 4~6 parts, polyoxyethylene sorbitol oleic acid ester 1~2 parts and initiator B 1~2 parts.The drag reducer of the application can reverse the wettability of rock surface to hydrophobicity, under the action of capillary force, water is difficult to enter reservoir pore, reduce the degree of shale reservoir hydration expansion, at the same time, increase the flowback rate of fracturing fluid.The application is suitable for drag reducer in shale oil and gas exploration and development.