Synthesis and retarder mechanism study of a novel amphoteric composite high temperature-resistant retarder for oil well cement

Abstract

An amphoteric composite polymer (hereinafter referred to as PAADM) as a high temperature-resistant cement retarder was prepared by in situ intercalated polymerization method with 2-crylamido-2-methylpropanesulfonic acid (AMPS), acrylic acid (AA) and two diallyl dimethyl ammonium chloride (DMDAAC) as monomers, and modified montmorillonite as an active polymerization filler. The synthetic composite polymer was characterized by Fourier transform infrared spectroscopy (FT-IR), H nuclear magnetic resonance (H-NMR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The results of the aforementioned characterization showed that the synthesized copolymer (PAADM) has an intercalation/exfoliation composite structure and excellent thermal stability. Performance evaluation evidenced that the cement slurry containing PAADM has good retarding property in the range of 120- 200C, and demonstrated the rapid development of compressive strength under high temperature and low temperature conditions, this property could guarantee that the retarder PAADM could be applied to the construction of deep wells and long interval wells. Moreover, the retarding mechanism of PAADM was studied through calcium binding capacity, adsorption amount, zeta potential, XRD and SEM analysis, and it was found that "adsorption deposition" and "calcium complexation" should be responsible for this retarder delaying the hydration process of cement grains.

High‐temperature resistant copolymer oil well cement retarder: Synthesis, assessment of performance, and mechanism of retardation

“…The peaks at 1555 and 1301 cm −1 are associated amide bands due to the coupling of δ NH and υ CN in the amide, which indicates the presence of amide groups in the polymer molecules. The absorption peak of CS appears at 629 cm −1 , proving that there are temperature‐resistant sulfonic acid groups in the polymer 6,14,18 . The symmetric and asymmetric stretching vibration absorption peaks of CO in the carboxylic acid group appear at 1457 and 1387 cm −1 13,30 .…”

“…The absorption peak of C S appears at 629 cm À1 , proving that there are temperatureresistant sulfonic acid groups in the polymer. 6,14,18 The symmetric and asymmetric stretching vibration absorption peaks of C O in the carboxylic acid group appear at 1457 and 1387 cm À1 . 13,30 The characteristic peaks at 1203 and 1117 cm À1 are, respectively, caused by the stretching vibration of nC O and the asymmetric stretching vibration of C O C in ether.…”

“…In contrast to other kinds of retarders, polymer retarders can be synthesized and designed artificially at the molecular level, and functional groups with superior performance can be introduced into the polymer under the desired formation conditions to enhance its retarding capabilities. [14][15][16] Zhang 17 et al prepared an oil well cement retarder by utilizing an aqueous solution polymerization process with AMPS, acrylamide (AM), and maleic anhydride (MA) as monomers. At 150 C, experiments demonstrate the excellent retarding capability of this retarder.…”

Synthesis of a novel amphoteric copolymer and its application as a dispersant for coal water slurry preparation

“…Such anchoring effects are so strong that the P(SS- co -AA- co -DMDAAC) molecules are adsorbed intensely on the coal surface. Moreover, the COO − groups could combine with metal cations through stable chelate adsorption [ 16 , 30 ], which is also beneficial to adsorption. Consequently, P(SS- co -AA- co -DMDAAC) exhibits superior wetting and adsorbance ability.…”

Occurrence Mechanism of the Abnormal Gelation Phenomenon of High Temperature Cementing Slurry Induced by a Polycarboxylic Retarder

“…Retarder is a necessary additive to guarantee the pumping safety of an oil well cement slurry. Currently, the commonly used oil well cement retarders mainly include lignosulfonates, , hydroxyl carboxylic acids, , organic phosphonates, and 2-acrylamido-2-methylpropanesulfonic acid (AMPS)-based polycarboxylic copolymers. , Among which, the AMPS-based polycarboxylic copolymer retarder is most commonly used in the high temperature cementing due to its excellent thermal resistance and designable molecular structure, which has become a research hotspot for domestic and foreign petroleum workers. ,− At present, the commonly used polycarboxylic retarders are mainly composed of monomers such as AMPS, acrylamide (AM), itaconic acid (IA), maleic acid, organophosphonic acid, and their derivatives, which are synthesized by free radical copolymerization. − This type of retarder achieves the aim of inhibiting the oil well cement hydration at high temperatures through its strong adsorption and complexation behavior. , …”