7results about How to "High viscosity retention" patented technology

The present application provides a kind of injection well volume low shear polymer injection device and its use method, the device includes first electric valve, buffer device, second electric valve, energy accumulator and third electric valve, pipeline A is the input main line of polymer solution, the inlet and outlet of the first electric valve are connected with pipeline A and the buffer device respectively, the inlet and outlet of the second electric valve are connected with the buffer device and the energy accumulator respectively, the inlet of the third electric valve is connected with the buffer device, and the outlet is connected with pipeline B leading to wellhead device, the buffer device and the energy accumulator indirectly regulate the speed of polymer liquid by regulating the flow of buffer liquid.The injection well volume low shear polymer injection device and its use method can be used in oilfield injection well ground flow, realize low shear injection of polymer solution from main line to wellhead, and has important significance for improving polymer solution viscosity retention rate and improving oil displacement effect.

The application discloses a loose sandstone oil reservoir intelligent layered polymer injection pipe column and a construction method, the polymer injection pipe column comprises at least two layered polymer injection units connected through oil pipes, the layered polymer injection unit comprises a layered packer and an intelligent adjusting injection device, the intelligent adjusting injection device is arranged below the layered packer, and the intelligent adjusting injection device is internally provided with anti-adsorption gravel; at least two levels of intelligent adjusting injection devices are arranged in one layered polymer injection unit, and the filling coefficients of the anti-adsorption gravels in each level of intelligent adjusting injection devices are different. The application discloses the idea of abandoning the polymer flow regulation of the current throttling unit, and innovatively adopts the pre-filling technology with different filling coefficients to regulate the flow, so that the viscosity retention rate is not affected by the machining precision, and the viscosity retention rate is relatively high.

This invention relates to the field of water-soluble polymer materials technology, and discloses a comb-shaped ternary polymer and its preparation process. The polyacrylamide is polymerized from a backbone monomer, anionic monomer, comb-shaped macromolecular monomer, and optional functional reinforcing monomers under the action of a redox and azo-based composite initiation system. The preparation process includes solution preparation and neutralization, deoxygenation and temperature control, adiabatic polymerization, and post-treatment steps, employing a control strategy combining low-temperature initiation and adiabatic temperature rise polymerization. This invention effectively overcomes the defects of traditional linear polymers—low viscosity retention and poor shear resistance—in high-temperature and high-salt environments by introducing comb-shaped side chains to create a steric hindrance effect. The resulting product possesses ultra-high molecular weight, low water-insoluble content, and excellent solubility, exhibiting excellent salt-resistant thickening advantages and mechanical stability, meeting the oil displacement requirements of harsh reservoir environments.

This invention provides an amphoteric crosslinking agent, a copolymer flow modifier, its preparation method, and its application. The invention prepares a multi-carboxyl amphoteric crosslinking agent, which is obtained by polymerizing an enamide monomer, a sulfonic acid monomer, an alkyl methacrylate, and the amphoteric crosslinking agent. The copolymer flow modifier provided by this invention is a hydrophobic crosslinking type high-temperature resistant flow modifier with a temperature resistance up to 240℃, a NaCl salt concentration resistance up to 15%, and a viscosity retention rate of over 80%. It exhibits excellent rheological properties after high-temperature aging and has broad application prospects in the field of high-temperature water-based drilling fluids.

The application discloses a layered sand prevention and polymer injection integrated pipe column and a construction method, relates to the technical field of oil exploitation, and the pipe column comprises a downhole pipe column and a control pipe column. The downhole pipe column comprises a layered sand prevention and polymer injection unit. The layered sand prevention and polymer injection unit comprises a positioning cylinder, an adjustable sand prevention and injection device, a blockage removal injection device and layered packers. The control pipe column comprises a positioning tool and a repeatedly switchable tool. The positioning tool can be positioned with the positioning cylinder, and the repeatedly switchable tool can control and regulate the adjustable sand prevention and injection device and the blockage removal injection device. The application realizes sand prevention and polymer injection integration through the adjustable sand prevention and injection device. The application realizes downhole efficient regulation through the positioning tool and the repeatedly switchable tool.

This invention relates to the field of cellulose ether modification technology, specifically to a low-ash composite modified sodium carboxymethyl cellulose and its preparation method. The preparation method includes: acidifying, alcoholizing, washing, resodiumizing, and purifying sodium carboxymethyl cellulose to obtain a low-ash precursor; reacting the low-ash precursor with sodium 2,3-epoxypropylene-1-sulfonate in a reaction medium composed of isopropanol and water, followed by reaction with propylene oxide to obtain an intermediate containing carboxymethyl, sulfonyl, and hydroxypropyl groups; subsequently reacting the intermediate with amino-modified β-cyclodextrin and purifying it; and then reacting it with formaldehyde and 1-adamantane isonitrile without the addition of free cyclodextrin inclusion agents to obtain low-ash composite modified sodium carboxymethyl cellulose. The resulting product has the characteristics of low ash content, low chloride ion residue, low water insoluble matter, salt resistance, hard water resistance, and good rheological stability after thermal aging, making it suitable as a filtration reducer for water-based drilling fluids.

The application relates to an anion crosslinking salt-resistant polyacrylamide and a preparation method thereof, raw materials of the oil phase and the water phase are used in the preparation method, the oil phase raw materials comprise Span 80, Tween 80 and white oil, the water phase raw materials comprise monomers and auxiliaries, the monomers comprise acrylamide and 2-acrylamide-2-methylpropanesulfonic acid. The stable three-dimensional network structure is constructed through the synergy of ternary monomers and moderate crosslinking, the product has high viscosity retention rate under high mineralization, excellent temperature resistance and shear resistance, fast dissolving speed, strong sand suspending capacity, and is suitable for the fracturing construction requirement of deep high-temperature high-salt oil and gas reservoirs.