Synthesis, characterization, and working mechanism of a synthetic high temperature (200°C) fluid loss polymer for oil well cementing containing allyloxy‐2‐hydroxy propane sulfonic (AHPS) acid monomer

Abstract

A polymer comprising of 2-acrylamido-2-methyl propane sulfonic acid, N, N-dimethyl acrylamide, allyloxy-2-hydroxy propane sulfonic acid (AHPS), acrylic acid, and N, N-methylene bisacrylamide was synthesized by aqueous free radical copolymerization and tested as high temperature performing fluid loss additive (FLA) in oil well cement. Successful incorporation of AHPS was confirmed and characteristic properties of the copolymer were determined using size exclusion chromatography. The FLA showed excellent water retention in cement at 200 C/70 bar. At this temperature, polymer structure changed from branched to linear and hydrodynamic size decreased by $50%, thus indicating potential fragmentation, while performance remained unaffected by these alterations. The FLA copolymer does not viscosify cement slurries which is advantageous in high temperature well cementing. The working mechanism of the AHPS-based copolymer was found to rely on reduction of filtercake permeability which is caused by a voluminous coprecipitate of the FLA with tartaric acid retarder, mediated by Ca 2þ ions.

Influence of an ionic liquid on rheological and filtration properties of water-based drilling fluids at high temperatures

“…Currently, the conventional approach for controlling the rheology and filtration of WBMs in deep drilling is to use water-soluble biopolymers or synthetic polymers as additives. However, there are inherent shortcomings of such polymers, which are either thermally degraded or generate a very high viscosity during filtration control at high temperature (Tiemeyer and Plank, 2013;Dias et al, 2015;Wan et al, 2011;Oyewole et al, 2013;Audibert et al, 1999;Kelessidis et al, 2007). The control of rheology and filtration of hightemperature WBMs remains a key technical problem, and high-temperature tolerating water-based drilling fluids are urgently required in drilling engineering (Han et al, 2014;Kelessidis et al, 2007;Alimohammadi et al, 2013).…”

Temperature-Induced Changes in the Solved Conformation of Cement Fluid Loss Polymers and the Consequences for Their Performance

“…The forpolymer of 2-acrylamido-tertiary-butyl sulfonic acid, allyloxy-2-hydroxy propane sulfonic acid (AHPS), N, N-dimethylacrylamide and acrylic acid (AA) was synthesized via aqueous free radical copolymerization according to a method described in the literature (Tiemeyer 2013). The chemical structure of the forpolymer is shown in Fig.…”

“…To overcome this gap, recently a graft copolymer composed of humic acid, ATBS, NNDMA and acrylic acid (AA) exhibiting high effectiveness at and above 150°C was proposed (Salami 2012). Even higher temperature stability (up to 200°C) was achieved with a forpolymer synthesized from ATBS, AHPS, NNDMA and acrylic acid utilizing N, N-methylene bisacrylamide (NNMBA) as crosslinking agent (Tiemeyer 2013).…”

Preparation and performance of AMPS/AA/DMAA/SA copolymer as a filtrate reducer for oil well cementing

“…Tiemeyer et al . reported a synthetic polymer based on allyloxy‐2‐hydroxy propane sulfonic acid which exhibits excellent fluid loss performance . Salami et al .…”

“…13 Tiemeyer et al reported a synthetic polymer based on allyloxy-2-hydroxy propane sulfonic acid which exhibits excellent fluid loss performance. 14 Salami et al described a graft copolymer which comprised side chains connected to the backbone by aqueous free radical copolymerization. The backbone was humic acid, and the lateral terpolymer chains contained the monomers of sodium 2-acrylamido-2-methylpropane sulfonate, N,N-dimethyl acrylamide, and acrylic acid.…”