4results about How to "Increased hydrodynamic volume" patented technology

The invention relates to a branched ultrahigh-salt and ultrahigh-temperature resistant polyacrylamide polymer as well as a preparation method and application thereof. The preparation method comprises the following steps: obtaining the polyacrylamide polymer with a branched structure by adopting a reducing agent octamethylpentaethylenehexamine; the branched polymer has a larger hydrodynamic volume and a denser intermolecular network structure, has better shear resistance, and can obtain a higher resistance factor and a higher residual resistance factor in a porous medium; and the problems of polymer molecule curl and obvious solution viscosity reduction caused by the electrostatic shielding effect can be weakened under the high-salt condition.

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.

The water-soluble polymer thickening agent is obtained by neutralizing functional modified polyether and glacial acetic acid, and the functional modified polyether is prepared from the following raw materials: mixed long-chain alkyl glycidyl ether and common polyether in a molar ratio of 1: (1.1-1.2); the addition amount of the aluminum isopropoxide is 0.03-0.05% of the sum of the mass of the mixed long-chain alkyl glycidyl ether and the mass of the common polyether. The invention also provides a preparation method of the water-soluble polymer thickening agent. The preparation method comprises the following steps: (1) preparing mixed long-carbon-chain alkyl glycidyl ether; (2) preparing common polyether; (3) preparing functional modified polyether; and (4) preparing the water-soluble polymer thickening agent. The invention aims to prepare a thickening agent which is relatively strong in bond energy and stable in chemical performance, so that the thickening agent can stably play a role at a relatively high temperature and in a relatively harsh pH environment, and is slightly influenced by pH and temperature.

The invention provides an integrated variable-viscosity polymer thickening agent and a preparation method thereof. The integrated variable-viscosity polymer thickening agent is specifically prepared from the following raw materials: acrylamide, N-benzyl-N-methacryloyloxy-N, N-dimethylamino ammonium chloride, docosyl polyoxyethylene ether methacrylate, azobis (isobutylamidine hydrochloride) and solvent deionized water. The prepared thickening agent has a good thickening effect, is resistant to high temperature, shear and salt, can be used as a drag reducer at a low concentration, and can be used as a thickening agent at a high concentration. The thickening agent prepared by the invention can be operated under the conditions of high temperature and high salinity, and has good compatibility with stratum. According to the invention, the polymer with large relative molecular mass, high cationic degree and good stability is obtained. The preparation equipment is simple in process, relatively low in price, easy to operate, less in pollution and easy for industrial production.