70results about How to "High drag reduction rate" patented technology

A drag reduction superhydrophobic coating and a preparation method thereof belong to the technical field of functional nanometer material application. A base of the drag reduction superhydrophobic coating adopts electroless metal deposition technique, a precious metal micro-nanometer binary grading composite structure is constructed on the base and decorated by a low surface energy material, a water static contact angle of the coating is larger than 150 degrees, and a rolling angle is smaller than 5 degrees. The drag reduction superhydrophobic coating is used for a model with motive power by itself, running speed of the model is obviously increased, and drag reduction rate is as high as 20%. The drag reduction superhydrophobic coating has good corrosivity resistance and can resist corrosion of strong acid and strong base solutions. The drag reduction superhydrophobic coating has repairability, and the preparation method can enable hydrophobicity of damaged areas to be rapidly recovered in a short period. The preparation method of the drag reduction superhydrophobic coating is simple, short in preparation period, and high in drag reduction rate.

The invention discloses a slippery water fracturing fluid with ultra-low interfacial tension with crude oil after degradation. The slippery water fracturing fluid is prepared from an ultra-low interfacial tension drag reducer, a demulsify-cleanup additive, a clay stabilizer and a degrading agent. A preparation method of the slippery water fracturing fluid comprises steps as follows: 0.02%-0.10% in percentage by mass of the ultra-low interfacial tension drag reducer, 0.1%-0.2% in percentage by mass of the demulsify-cleanup additive and 0.3% in percentage by mass of the clay stabilizer are added to every ton of water, the agents are mixed to form a homogeneous solution, and 0.08% of the degradation agent is added from a mixing tank of blending equipment during construction. Additives of the slippery water fracturing fluid are all liquid phase, and the slippery water fracturing fluid can be quickly dispersed in water, have good salt tolerance, are not easily affected by the content of bacteria in a fluid preparation solution and have a stable drag reduction effect under the construction displacement of 6-20 m<3>/min; when applied to improvement of low-permeability oil and gas reservoirs, the slippery water fracturing fluid can reduce the interfacial tension between a gel breaking liquid and crude oil and reduce string and construction friction, helps production of the crude oil, increases of the yield of the crude oil and can be prepared repeatedly from backflow fracturing fluids.

The invention discloses an acrylamide copolymer, and a preparation method and an application thereof. The acrylamide copolymer contains a constitutional unit A, a constitutional unit B, a constitutional unit C and a constitutional unit D, wherein the constitutional unit A is a constitutional unit represented by formula (1) and/or a constitutional unit represented by formula (2), the constitutional unit B is one or more of constitutional units represented by formula (3), formula (4), formula (5) and formula (6) respectively, the constitutional unit C is a constitutional unit represented by formula (7) and/or a constitutional unit represented by formula (8), and the constitutional unit D is a constitutional unit represented by formula (9) and/or a constitutional unit represented by formula (10); and the viscosity average molecular weight of the acrylamide copolymer is 2,000,000-25,000,000. The acrylamide copolymer has the advantages of high drag reduction rate, high heat and salt resistance, good high-shear resistance, good water solubility, good compatibleness with clay inhibitors (alcohol), and small damages to the stratum.

The invention relates to the preparation of organic macromolecule compounds and the technical field of pipeline systems, in particular to a method for preparing a poly alpha-olefin drag reduction agent suspension. A solvent comprises 15-45 percent of poly alpha olefin particles, 5-15 percent of long carbon chain amide, 50-60 percent of solvent, 1-5 percent of surface active agent, 0.1-2 percent of thickening agent, and 10-20 percent of suspending agent and stabilizing agent according to the proportion when the total weight of the solvent is 100, and long carbon chain amide powder particles are fully contacted in the solvent containing at least one surface active agent and emulsified at a certain temperature, and the alpha-olefin drag reduction agent suspension is obtained by adding ground poly alpha-olefin particles with super high molecular weight and at least one of a surface active agent, a suspending agent, a stabilizing agent and a dispersing agent into the emulsified solvent. The suspension prepared by the method has long storage cycle, high content of poly alpha-olefin particles, large drag reduction rate, and low transportation and preparation costs.

The invention discloses a preparation method for oil soluble drag reducer, which is characterized in that high purity an alpha-olefin material is obtained through implementing absorption and distillation pretreatment on alpha-olefin mixture; a Ziegler-Natta catalyst is added for prepolymerization to lead the viscosity of a liquid to be capable of preventing the catalyst from sinking; then polymerization reaction is implemented under a lower temperature between 10 DEG C between zero and 0 DEG C and finished until a conversion rate of monomer reaches 95 percent; then a drag reducing polymer is cut and a dispersing agent is added; then the drag reducing polymer is frozen by liquid nitrogen and is crushed to a granularity of 129 meshes under a low temperature; then the dispersing agent is dispersed, and the drag reducing polymer is mixed with a thickening agent and an aqueous surfactant liquid to prepare a finished product of stable drag reducer suspension. The drag reducing polymer copolymerized through the preparation method has high molecular weight, is easy to crush under low temperature, has fast solution velocity, is not adhered on the wall of an oil pipeline and has high drag reducing rate.

The invention relates to the technical field of drag reduction agents, and provides a poly-alpha-olefin drag reduction agent and a preparation method thereof. The poly-alpha-olefin drag reduction agent comprises alpha-olefin, solvent, a Ziegler-Natta catalyst and gas, wherein the gas is ethylene or propylene gas. The preparation method comprises the following steps: adding the Ziegler-Natta catalyst into the alpha-olefin and solvent in a nitrogen gas protective atmosphere, performing polymerization reaction on the long-chain olefin part, then introducing the ethylene or propylene gas, and performing binary copolymerization reaction to obtain the poly-alpha-olefin drag reduction agent. Thus, the poly-alpha-olefin drag reduction agent has the characteristics that the ethylene or propylene gas raw material is less prone to self polymerization in the reaction and is cheap and accessible, and the obtained poly-alpha-olefin drag reduction agent is high in drag reduction rate; and the production cost is lowered, and the shearing resistance is improved.

The invention provides a bionic centrifugal pump blade. A bionic structure is arranged on the back side of the blade and comprises a plurality of lines of spherical pits. Each line of spherical pits are arranged in the width direction of the blade. The start position of the bionic structure is arranged at the position 1/3L away from the inlet edge of the blade, wherein L is the length of the blade. When the bionic centrifugal pump blade works, low-speed fluid forms vortexes, and the vortexes accumulate in the spherical pits. The bionic centrifugal pump blade lowers the corresponding flow losscaused by wall shear stress, improves the work efficiency of an impeller and prolongs the service life of the blade. Meanwhile, it is only needed to arrange the bionic structure in the middle of the back face of the blade, the shaping area of the bionic structure is small, so that the machining amount is reduced, machining is facilitated, and cost is lowered.

The invention relates to an acrylamide series terpolymer, a preparation method, and applications thereof. The acrylamide series terpolymer comprises a structural unit A, a structural unit B, and a structural unit C, wherein the structural unit A comprises a structural unit represented by the formula (1), the structural unit B comprises a structural unit represented by the formula (2), and the structural unit C comprises a structural unit represented by the formula (3). The acrylamide series terpolymer improves the solubility of the terpolymer in alcohol and clay inhibitor, has high drag reduction efficiency under a high salinity condition when the terpolymer is used as a drag reducer, and has a very good drag reducing effect in a pH range from 4 to 10.

The invention discloses an acrylamide copolymer and a preparation method and application thereof. The acrylamide copolymer contains a structural unit A and a structural unit B, wherein the structural unit A is a structural unit shown as a formula (1) and/or a structural unit shown as a formula (2); the structural unit B is a structural unit shown as a formula (3) and/or a formula (4); the viscosity-average molecular weight of the acrylamide copolymer is 4,000,000-20,000,000. The acrylamide copolymer provided by the invention has high drag reduction efficiency, high shear resistance, high salt tolerance and high compatibility with clay inhibitors and bactericides. The formula (1), the formula (2), the formula (3) and the formula (4) are shown in the specification.

The invention relates to the technical field of fracturing fluids, and discloses a drag reducer and a preparation method thereof as well as a slickwater fracturing fluid and application. The drag reducer contains a structural unit as shown in a formula (1) and a structural unit as shown in a formula (2) or a formula (3), m ranges from 20000 to 28000, n1 ranges from 90 to 130, and n2 ranges from 50 to 80; and the weight-average molecular weight of the drag reducer is 1.5 million to 2 million. The slickwater fracturing fluid has good temperature resistance and shear resistance, and has a better drag reduction effect.

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 the field of oilfield chemistry, and discloses nano-silica, a nano-composite slick water fracturing fluid and a preparation method and application thereof.The preparation method of the nano-silica comprises the steps that 1, silicate ester, ethyl alcohol and water are subjected to a first reaction in the presence of acid, and an intermediate product system is obtained; and (2) carrying out a second reaction on the intermediate product system and dicarboxyl polyethylene glycol, and freeze-drying the obtained product to obtain the nano silicon dioxide. The nano-silica, a drag reducer, a discharge aiding agent, an anti-swelling agent and water are prepared into the nano-composite slickwater fracturing fluid with a specific formula, and the slickwater fracturing fluid has fracturing sand-carrying performance and imbibition oil discharge performance, and is high in drag reduction rate and excellent in temperature resistance and shear resistance.

The invention provides a novel drag reducer for fracturing and particularly relates to a drag reducer for fracturing fluid in petroleum fracturing construction. Adding a small quantity of novel drag reducer for fracturing in the fluid can reduce flow resistance in the turbulence state. A drag reduction rate can be up to 79.5% and can still keep at 79.4% after 5 hours' high-strength shearing. The novel drag reducer for fracturing is suitable for long-distance transportation.

The invention discloses an integrated piezoelectric vibration resistance reducer capable of being embedded in the wall face, and belongs to the technical field of fluid vibration resistance reducing. The problems that an existing resistance reducer is complex in structure, large in occupied space, difficult in control and poor in universality are solved. The integrated piezoelectric vibration resistance reducer is technically characterized in that the head and the tail of an underwater vehicle are in a conical shape, the middle portion is in a cylindrical shape, piezoelectric vibration resistance reducer bodies are specifically embedded in the middle portion and the tail of the underwater vehicle and each comprises a resistance reducer cavity and a piezoelectric vibrator; the piezoelectric vibrator of each piezoelectric vibration resistance reducer body comprises a copper sheet, a piezoelectric plate or a piezoelectric stack I or a piezoelectric stack II and a wire, wherein the copper sheet is placed in the middle of the corresponding resistance reducer cavity, the copper sheet and the corresponding resistance reducer cavity are installed in a sealed manner, and the top end of the piezoelectric plate or the piezoelectric stack I or the piezoelectric stack II is in glue joint with the copper sheet and located below the copper sheet; and an auxiliary hole is formed in each resistance reducer cavity and used for guiding-out of the wire of the corresponding piezoelectric vibrator. The integrated piezoelectric vibration resistance reducer is used for reducing the fluid contact wall face friction resistance and delaying boundary layer separation during sailing of the underwater vehicle, and pressure difference resistance is reduced.

The invention provides a fracturing fluid sand-carrying agent and a slickwater drag reducer based on a thermal tackifying emulsion polymer, and the thermal tackifying emulsion polymer is applied to the process of increasing the yield of petroleum and natural gas through hydraulic fracturing and is used for preparing the fracturing fluid sand-carrying agent or the slickwater drag reducer on site. The thermal tackifying emulsion polymer is obtained by polymerizing a temperature-sensitive macromolecule, an anionic monomer and an acrylamide monomer, and the temperature-sensitive macromolecule is apolyoxyethylene-polyoxypropylene-polyoxyethylene triblock polymer. According to the invention, the defects that a conventional fracturing fluid system needs to be dissolved and crosslinked in advance, and the fluid preparation process is tedious are overcome, and meanwhile, the defect that the sand carrying performance or the drag reduction efficiency of a traditional fracturing fluid or the slickwater drag reducer becomes poor due to thermal thinning is overcome.

The invention discloses an emulsion type anti-wear and anti-drag thickening agent for fracturing and a preparation method thereof, and the preparation method comprises the following steps: 1, preparation of a water phase: successively adding acrylamide and triethanolamine oleic soap into water, and uniformly mixing; step 2, preparing an oil phase, namely adding span 80 into white oil, and then uniformly stirring and mixing; step 3, preparing an emulsion, slowly adding the water phase in the step 1 into the oil phase in the step 2 in a stirring state, and circularly emulsifying for 1-3 times by using a homogeneous emulsification pump after the water phase in the step 1 is completely added into the oil phase in the step 2; and 4, polymerization reaction: putting the emulsion prepared in the step 3 into a reaction kettle with a stirrer, stirring, filling nitrogen for more than 20 minutes, adding an oxidant, heating, and slowly dropwise adding a reducing agent. When the emulsion type anti-wear and anti-drag thickening agent for fracturing is used for preparing a fracturing fluid, the thickening property is good, and the construction friction resistance is low; when used for preparing coiled tubing construction liquid, the lubricating oil has good lubricating property and strong wear resistance.

The invention provides a drag reducer with a pour-point depression function and a preparation method of the drag reducer. The drag reducer comprises components in parts by weight as follows: 147-150 parts of 1-butylene hydrocarbon, 180-185 parts of vinyl acetate, 0.5-1 part of titanium tetrachloride-triethylaluminium, 570-575 parts of n-butyl alcohol and 90-100 parts of an emulsifier OP. According to the drag reducer with the pour-point depression function, the condensation point of crude oil can be effectively reduced, the energy loss in the crude oil flowing process is reduced, energy consumption can be greatly reduced, the pour point of the crude oil is reduced by 10 DEG C, the drag reduction rate is increased by 47.6%, the throughput increase rate is increased by 43.7%, the throughput can be improved, the flow speed is increased, and energy consumption is reduced.

The invention discloses an acrylamide copolymer, a preparation method and an application. The acrylamide copolymer contains a constitutional unit A, a structural unit B, a structural unit C and a structural unit D, wherein, the structural unit A is the structural unit shown in a formula (1), the structural unit B is the structural unit shown in a formula (2), structural unit C is the structural unit shown in a formula (3), and structural unit D is the structural unit shown in a formula (4), and the viscosity average molecular weight of the acrylamide copolymer is 5-15 million. The provided acrylamide copolymer has the advantages of high drag reduction efficiency, high salt tolerance, good high shear-resistance performance, good water solubility, good compatibleness with a clay stabilizing agent and low damage to stratum.

The invention belongs to the technical field of drag-reduction film composition for oil field production increase, and particularly discloses drag-reduction film composition. The drag-reduction film composition is prepared from raw materials as follows: water, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, polyene amine, dimethyl diallyl ammonium chloride and an initiator. The drag-reduction film composition in the scheme has excellent drag-reduction performance, a propping agent is coated with a drag-reduction film by the prepared drag-reduction film composition, and after the propping agent is added to clear water, the drag-reduction film can be rapidly dissolved in the clear water and performs drag-reduction on the clear water.