3results about How to "Good viscosity increase" patented technology

The application discloses an integrated composite acid emulsion applied to fracturing fluid and acid liquid and a preparation method thereof, and belongs to the technical field of oil and gas field exploitation. The preparation steps of the emulsion are as follows: S1, organic solvent and composite emulsifier are mixed, stirred, dispersed and uniformly distributed to obtain an oil phase; S2, quaternary ammonium salt unsaturated monomer, sodium benzenesulfonate unsaturated monomer, methacryloyloxyethyl phosphate and a complexing agent are added into water, mixed uniformly and adjusted to have a pH value of 7-9 to obtain an aqueous phase; S3, under the condition of stirring, the aqueous phase is added dropwise into the oil phase to form a water-in-oil emulsion; S4, after nitrogen is passed through the water-in-oil emulsion to remove oxygen, an initiator is added, the temperature is increased to 40-60 DEG C, and stirring reaction is carried out for 4-8 h to obtain the integrated composite acid emulsion. The composite acid emulsion prepared by the inverse emulsion polymerization method has the characteristics of strong thickening, high resistance, high temperature resistance, crosslinking and on-line viscosity change when applied to water and acid liquid, and is an integrated composite acid thickening agent emulsion suitable for fracturing fluid and acid liquid.

The present application relates to oil and gas field chemical auxiliary technical field, disclose a kind of high-temperature resistant hyperbranched viscosifying self-generating acid, preparation method and application thereof, the viscosifying self-generating acid of the present application is prepared by iteration reaction with maleic anhydride and polyhydroxy alcohol and / or polyhydroxy alcohol amine as raw material, and the viscosifying self-generating acid obtained by preparation is hyperbranched molecule, and its molecule has hyperbranched structure inside.The hyperbranched viscosifying self-generating acid of the present application is hyperbranched structure, without additional thickening agent when using, itself has thickening function, with excellent viscosifying performance, and preparation process is simple, yield is high and cost is low.And, as acidizing fluid still has good self-generating acid ability under superhigh temperature, especially suitable for acid fracturing reconstruction of superhigh temperature reservoir.

The application discloses an online mixing-free variable-viscosity high-resistance-slowing acid, and provides an online mixing-free variable-viscosity high-resistance-slowing acid system, wherein the performance of acid liquid can be changed by changing the adding amount of the agent, and the acid liquid does not need to be prepared in advance. The film-forming agent can form an adsorption film on the surface of rock, and the adsorption film blocks the contact between H+ and rock, thereby slowing the acid-rock reaction rate. The application also has multiple composite slow-down performances, and combines the characteristics of foam slow-down acid and gelling slow-down acid. Through the thickening and slowing down of the multiple-effect agent and the blocking and slowing down of the film-forming agent, the acid-rock reaction rate is greatly reduced under the double slow-down effect of the two. In addition to the good thickening effect, the application also has excellent resistance-reducing performance, and one agent is used for multiple purposes to reduce the adding amount and type of the additive. Meanwhile, the resistance-reducing rate of the system reaches more than 85%, which is much higher than the 70% of the traditional system.