Novel powder cationic polymer for preventing clay from hydration swelling

Abstract

The invention relates to a novel powder cationic polymer for preventing clay from hydration swelling, and belongs to the technical field of clay hydration swelling prevention in oil-gas field development. The novel powder cationic polymer is prepared from acrylamide, dimethyl diallyl ammonium chloride and methyl acrylyl ethyl trimethyl ammonium chloride as raw materials, and an ammonium persulfate and sodium hydrogen sulfite redox initiation system is adopted to prepare a novel powder cationic polymer solution for preventing clay from hydration swelling through polymerization of solution free radicals, and the cationic polymer solution is further transferred into micro drying equipment to be dried, and is successively further prepared into crude powder and fine powder, thereby obtaining the powder cationic polymer. By adopting the novel powder cationic polymer, a great amount of expensive, combustible or even toxic solvents are not used, separation equipment is not needed, and the problems that to maintain the flowability of a polymer solution, a conventional solution cationic polymer is relatively low in effective concentration, the package and transportation cost can be increased, a raw material holding space is large and the cationic polymer is inadaptive to the space of an ocean marine petroleum exploitation working platform can be solved.

Description

technical field [0001] The invention relates to a novel powdery cationic polymer for preventing clay hydration expansion, which belongs to the technical field of preventing clay hydration expansion during oil and gas field development. Background technique [0002] The hydration expansion of clay minerals can be divided into the following two stages: one is the surface hydration expansion stage: since the silicon-oxygen bonds and hydrogen-oxygen bonds on the surface of the clay crystal surface are polar, they can adsorb polar water molecules. It is the hydration energy of the clay surface that plays a major role. The second is the osmotic hydration expansion stage: a hydration film is formed on the surface of the clay particles, and the distance between clay lattice layers increases, causing swelling and even dispersion. The effect of surface hydration energy on hydration is greatly weakened, and the surface hydration is also over. When the clay is in a low-salinity aqueous...

AI Technical Summary

Problems solved by technology

This drying method has low dehydration strength, long material residence time, uneven granulation during granulation, and very inconsistent feeding speed in the rotary drum, resulting in uneven drying of the product, resulting in poor water solubility and a significant drop in molecular weight, thus affecting product quality. influences

Moreover, the heat exchange efficiency of this kind of drying equipment is low, and the energy consumption is huge, which is not conducive to energy saving.