Abstract
The retarding side effect and the compatibility with other additives are the main problems that limit the field application of the synthesized fluid loss control additive (FLCA). The effect of the type and content of carboxylic acid groups on the retarding side effect of FLCA and the compatibility between FLCA and the retarder AMPS-IA synthesized using 2-acrylamido-2-methyl propane sulfonic acid (AMPS) and itaconic acid (IA) was studied in this paper. The type and content of carboxylic acid group have a great influence on the fluid loss control ability, the compatibility with retarder and the retarding side effect of FLCA. FLCA containing IA or maleic acid (MA) shows better compatibility with retarder than FLCA containing acrylic acid, but the retarding side effect of FLCA containing MA is weaker than that of FLCA containing IA. Thus, MA is the most suitable monomer for synthesizing FLCA having good compatibility with retarder AMPS-IA.
Highlights
Well cementing is needed after drilling of every oil and gas well has been completed; good cementing quality is the key to ensure the safe and efficient production of a well in the long term [1 – 4]
AMPS with effective weight over 98%, N,N-dimethylacrylamide (NNDMA) with effective weight over 98%, acrylamide (AM) with effective weight over 98%, itaconic acid (IA) with effective weight over 99%, maleic acid (MA) with effective weight over 99.5%, acrylic acid (AA) with effective weight over 98%, sodium hydroxide (NaOH) with effective weight over 96%, ammonium persulfate (APS) with effective weight over 98%, sodium bisulfite (SOB) with effective weight over 99% and potassium persulfate with effective weight over 99.5% were obtained from Sinopharm Chemical Reagent Co. (Shanghai, China)
API class ‘G’ cement was obtained from Sichuan Jiahua Enterprise (Leshan, China), and the phase composition and physical properties of class ‘G’ cement are presented in table 1
Summary
Well cementing is needed after drilling of every oil and gas well has been completed; good cementing quality is the key to ensure the safe and efficient production of a well in the long term [1 – 4]. The fluid loss control ability of FLCA was impaired when the dispersant was introduced in the cement slurry. The effect of the type and content of the carboxylic acid group on the compatibility was not studied systematically. The retarding side effect of FLCA should be controlled to a very low level as far as possible, which will be convenient for the formula adjustment of the cement slurry in the field application. In order to obtain FLCA showing good compatibility with retarder AMPS-IA and a minimum retarding side effect, it is necessary to understand the effect of the carboxylic acid group on the performance of FLCA. In order to ensure the retarding side effect of FLCA is as low as possible, the influence of the carboxylic acid group on the retarding side effect of FLCA was studied. The results of this research could be very significant for understanding the influence of carboxylic acid groups on the performance of FLCA, to guide the research and development of FLCA and to ensure the correct field application of FLCA
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