Synthesis and Application of Silicon Scale Inhibitor SY-KD Under the ASP Flooding System†

doi:10.7503/cjcu20130894

Abstract

Abstract:

By analyzing silica scale formation mechanism under the alkaline/surfactant/polymer(ASP) floo-ding system, we designed and synthesized a new type of scale inhibitor SY-KD. SY-KD inhibitor is a complex mixture that made by the polymer(CAABS) which is copolymerized by acrylic acid(AA) and p-methyl allyl oxybenzene sulfonate(MBS) & 2-phosphate-1,2,4-tricarboxylic acid(PBTC). The carboxyl functional groups of SY-KD can link to the orthosilicic acid molecules or its dimer acid through hydrogen bonding interactions, since the molecular chain of SY-KD’s steric effect would prevent further polymerization that the orthosilicic acid molecules or its dimer acid form silica dioxide. Laboratory experiments studies have shown that SY-KD is a good inhibitor for ASP flooding, each component of SY-KD can achieve the silicon scale inhibition ability mainly through the polymerization inhibition, the adsorption and dispersion, and the dissolution of insoluble SiO₂. Field tests have shown that SY-KD scale inhibitor delays the average pump detection period of scaled wells from about 50 d to 300 d.

Key words: Alkaline/surfactant/polymer(ASP), Silicon scale, Scale inhibitor

CLC Number:

O647
O631

TrendMD:

CHENG Jiecheng, WANG Qingguo, ZHOU Wanfu, LI Su, CHENG Tiexin, ZHOU Guangdong. Synthesis and Application of Silicon Scale Inhibitor SY-KD Under the ASP Flooding System^†[J]. Chem. J. Chinese Universities, 2014, 35(2): 332.

Figures/Tables 11

Fig.1 Data of silicon content changes with time in ASP aqueous soaked rockThe rocks were taken from the wells: a. South 5-21-P34; b. North 1-55-E66.

Fig.2 Data of silicon ions changes during ASP aqueous driving corea. Central sampling; b. bottom sampling.

Fig.3 IR spectrum of CAABS

Fig.4 Renderings of CAABS static resistance SiO2 scaleConcentration of CAABS/(mg·L-1): a. 0; b. 50; c. 100; d. 200.

Fig.5 Schematic diagram of interaction between CAABS and silicic acid dimer

Fig.6 IR spectra of SY-KD and Na2SiO3 system a. CAABS+Na2SiO3; b. CAABS.

Fig.7 IR spectra of CAABS and insoluble SiO2 mixed systemsa. CAABS; b. SiO2+CAABS; c. SiO2.

Fig.8 Dissolved silicon content of various amounts of PBTCConcentration of PBTC/(mg·L-1): a. 0; b. 200; c. 2500; d. 5000; e. 7500; f. 10000.

Fig.9 Results of SY-KD and conventional inhibitor resistance to silicaa—d. Concentration of SY-KD are 0, 50, 100, 200 mg/L; e. concentration of HEDP is 200 mg/L; f. concentration of PBTC is 200 mg/L.

Fig.10 Fouling of plus(A) and unregulated(B) scale inhibitor screens in La 9-AS2711 wells

Fig.11 SEM image(A) and EDAX pattern(B) of the scaled sample in La 9-AS2711 well

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