The swelled clay shrinkage property and inhibition of microcosmic migration in pores of quaternary ammonium salt cationic polymer

Abstract

In the low permeability and high water-sensitive reservoir, water injection may induce the clay minerals hydration swelling and dispersing migration, which are the main factors for formation damages. Sodium montmorillonite, which is easier to hydrate in water than other clay minerals, is usually used to analyze the hydration of clays. A quaternary ammonium salt cationic polymer was synthesized and used as a clay stabilizer. The stability of sodium montmorillonite by interaction with the quaternary ammonium salt cationic polymer was studied, and the swelled clay shrinkage property of the quaternary ammonium salt cationic polymer was also analyzed and assessed by using the XRD, ESEM and visual micro-lithography model from microcosmic points. The results show that the interplanar spacing of hydration swelling sodium montmorillonite observed by XRD decreased as the quaternary ammonium salt cationic polymer infiltrated into the clay and replaced exchangeable cations. ESEM observations show that the sodium montmorillonites were wrapped by quaternary ammonium salt cationic polymer because of the network structure, which could make the size of the hydration swelling sodium montmorillonites smaller. The visual microlithography models confirmed that the clays were wrapped by the quaternary ammonium salt cationic polymer. The hydration swelling and dispersing migration were thus inhibited. Considering the experimental results, this quaternary ammonium salt cationic polymer can play a significant effect on the inhibition of clay hydration swelling and dispersing migration.

Preparation of a Cationic Hyperbranched Polymer for Inhibiting Clay Hydration Swelling in the Process of Oilfield Waterflooding

“…In clay minerals, Mt is a main composition to lead to clay hydration swelling, and thus inhibiting Mt hydration swelling is an effective way to reduce water sensitivity damage to the low-permeability reservoirs. , Clay inhibitors can reduce water sensitivity damage to the low-permeability reservoirs . At present, clay inhibitors mainly include inorganics that are mainly salts, acids and alkalis, cationic surfactants, and organic cationic polymers . It is worth noting that organic cationic polymers can form a multipoint and irreversible adsorption for clay particles and thus have an excellent inhibition ability.…”

“…7 At present, clay inhibitors mainly include inorganics that are mainly salts, acids and alkalis, cationic surfactants, and organic cationic polymers. 8 It is worth noting that organic cationic polymers can form a multipoint and irreversible adsorption for clay particles and thus have an excellent inhibition ability. However, cationic polymers are usually high-molecular-weight linear polymers with easily entangled chains, which are easily adsorbed on the pore wall of reservoirs.…”

Design and Study of a Novel Thermal-Resistant and Shear-Stable Amphoteric Polyacrylamide in High-Salinity Solution

“…Acrylamide copolymer containing SSS is expected to exhibit remarkable anti-shearing property and temperature resistance [ 22 ]. The cationic monomer, acryloxyethyl trimethyl ammonium chloride (DAC), can inhibit the hydration swelling ability of clay minerals, and its bulky side chains can boost the salinity tolerance and shear-stability [ 34 ]. Furthermore, both SSS and DAC are cheap and undergo copolymerization actively.…”