Zwitterionic copolymer for controlling fluid loss in Oilwell cementing: Preparation, characterization, and working mechanism

Abstract

The present investigation deals with the problems of unsatisfactory high-temperature resistance, inferior salt tolerance and poor comprehensive performance for the domestic fluid loss additives. In this study, a zwitterionic polymer, 2-acrylamido-2-methylpropanesulfonic acid/diallyldimethylammonium chloride/N,N-dimethylacryl amide/ acrylic acid used as fluid loss agent for oil well cementing, was synthesized by free radical polymerization in aqueous solution with ammonium persulfate and N,N,N 0 ,N 0 -tetramethylethylenediamine as initiator. The optimal synthesis conditions were obtained via singlefactor variable analysis. The compositions, microstructural morphologies, and thermal-stability of polymer were characterized by FT-IR, 1 H NMR, SEM, DTG, and DSC techniques. The results manifested that the synthetic polymer cement slurry exhibited prominent advantages such as excellent fluid loss control capacity, thermal stability (up to 2008C), salt-tolerance (saturated brine) and rheological behavior. Even more strikingly, the zwitterionic polymer showed less impact on hardening cement and accelerated the post compressive strength of set cement, verified through the ultrasonic method. Additionally, the mechanism of fluid loss control was found to rely mainly on improving the filter cake quality and the polymer chemisorptions on the surface of hydrated cement through SEM, permeability and TOC analysis. In consequence, the zwitterionic polymer enhanced the comprehensive properties of cement slurry and had great potential to apply in high temperature and high salinity oil-well cementing. POLYM. ENG. SCI., 57:78-88, 2017.Note: L.O.I is loss on ignition; C 3 S: tricalcium silicate (3CaOÁSiO 2 ); C 2 S: dicalcium silicate (2CaOÁSiO 2 ); C 3 A: tricalcium aluminate (3CaOÁAl 2 O 3 ); C 4 AF: tetra calcium aluminate ferrite (4CaOÁAl 2 O 3 ÁFe 2 O 3 ).

A “three-in-one” strategy based on an on-demand multifunctional fluorescent amphoteric polymer for ecological leather manufacturing: a disruptive wet-finishing technique

“…45 The AC carboxyl group's –OH stretching vibration absorption peak appeared at 3547 cm −1 . Furthermore, there was no unsaturated double bond absorption peak at 1640 cm −1 , 46 indicating that pADD was successfully synthesized.…”

Performance Evaluation of Polycarboxylic Acid Dispersant for Oil Well Cementing

“…Nevertheless, the n and k values of cement slurry with DRPC-1L remain relatively constant. Generally, n can qualitatively indicate the flow capacity of cement slurry, and k represents its consistency [13]. It turns out that the polycarboxylic acid dispersant, DRPC-1L, possesses more excellent fluidity retention capacity than DRS-1S through the change in molecular conformation.…”

Effect of a 2-Acrylamido-2-methylpropanesulfonic Acid-Based Fluid Loss Additive on the Hydration of Oil Well Cement

“…The adsorption ability of different anionic groups on cement particles is SO 3 − < normalC normalO 2 − < v i c false( normalC normalO 2 − false) 2 < normalP normalO 3 2 − . Carboxylic group-containing monomers − and phosphate group-containing monomers , are often used as anchor groups. They have strong adsorption on cement particles and can improve the high temperature resistance of FLA. − The water-soluble polymer FLA containing these groups has a maximum applicable temperature of more than 200 °C. − The adsorption of the FLA on the surface of cement particles will affect cement hydration.…”