A kind of modified polyacrylamide and its preparation method and polymer mud

Abstract

The invention discloses a modified polyacrylamide, a preparation method thereof and polymer mud, which comprises the following steps: dissolving an emulsifier, sodium α-olefin sulfonate and acrylamide in deionized water to prepare a first solution; Allyl mellitic acid ester is dissolved in deionized water to obtain the second solution; Initiator is dissolved in deionized water to obtain the third solution; Hydrophobic monomer and acrylic acid are dissolved in deionized water to obtain the fourth solution; After the first solution is deoxygenated, the second solution is added dropwise therein, and the temperature is raised to 60-65° C.; the third solution and the fourth solution are added dropwise thereinto and the reaction is continued for 5-6 hours, adjusting After the pH of the system is 7-8, the stirring reaction is continued and purified to obtain a modified polyacrylamide, wherein the process of adding the second solution, the third solution, and the fourth solution dropwise is carried out under the condition of deoxygenation. The modified polyacrylamide prepared by the preparation method has the performance of resisting salt and shearing.

Description

technical field [0001] The invention belongs to the field of pile foundation wall protection materials, and in particular relates to a modified polyacrylamide and a preparation method thereof, and also relates to a polymer mud. Background technique [0002] Bentonite slurry is a suspension system in which clay is dispersed in the form of colloidal particles in a treatment agent solution. Due to its shortcomings such as strong alkalinity, high heavy metal content, and high solid content that cannot be dried naturally, it cannot meet the requirements of on-site civilized construction. In order to solve the many deficiencies of traditional bentonite mud wall materials, more and more technical personnel pay more and more attention to environmentally friendly polymer mud. But by water salinity (Na + , M copies 2+ , Ca 2+ ), the viscosity of the polymer mud is reduced due to the electrostatic interaction of anions and cations, the colloidal structure is destroyed, and the wall ...

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Problems solved by technology

[0004] At present, CN1307280C discloses a polyalcohol biopolymer saturated brine drilling fluid, which is applied to special oil field drilling construction with gypsum-salt layer development, many faults, and complex formation changes, but it has not been studied for high salinity geology

CN107382128A discloses an anti-slump polymer mud powder and its preparation method and application. The polymer mud powder can be applied to water-sensitive geology, but cannot be used under high salinity conditions

The above inventions are all dedicated to improving the quality and efficiency of pile foundation construction, but none of them involve the research on pile foundation construction of high salinity geology. The viscosity of traditional polymer mud will be greatly reduced in 100g / L salinity water quality, and at the same time Under the strong shear of the drilling rig, the viscosity drops even up to 50%, so that the general products cannot play a good role

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