【摘要】：為拓寬黃原膠的應(yīng)用范圍,采用環(huán)氧丙烷和氯乙酸鈉在醇溶劑中與黃原膠(XG)反應(yīng)制得淡黃色的羧甲基羥丙基黃原膠(CMHPXG)。對(duì)羧甲基羥丙基黃原膠的流變特性(剪切變稀性、黏彈性、觸變性)以及其作為壓裂液的基本性能(攜砂性、耐溫耐剪切性)進(jìn)行了研究。結(jié)果表明,0.5%CMHPXG溶液的表觀黏度比0.5%XG溶液增大了3.35倍,且CMHPXG溶液的彈性模量、黏性模量和觸變環(huán)面積均比XG溶液有顯著的提高。陶粒在CMHPXG溶液的沉降速度遠(yuǎn)小于在XG溶液的沉降速度,攜砂性能得到提高。0.4%XG溶液在30℃的表觀黏度為43.1 mPa·s,而0.4%CMHPXG溶液在120℃、170 s~(-1)下剪切90 min后的保留黏度仍有64 mPa·s,CMHPXG溶液的耐溫耐剪切性能相對(duì)XG有較大程度的提高。XG和CMHPXG溶液的流動(dòng)曲線可用Cross本構(gòu)方程進(jìn)行表征,且模擬值與實(shí)驗(yàn)值吻合良好。相較于黃原膠,羧甲基羥丙基黃原膠的基本性能得到了較大幅度的提高。
[Abstract]:In order to widen the scope of application of xanthan gum, a yellowish carboxymethyl hydroxypropyl xanthan gum (CMHPXG). Was prepared by reaction of propylene oxide and sodium chloroacetate with xanthan gum (XG) in alcohol solvent. The rheological properties (shear thinning, viscoelasticity, thixotropy) of carboxymethyl hydroxypropyl xanthan gum and its basic properties as fracturing fluid (sand carrying property, temperature and shear resistance) were studied. The results show that the apparent viscosity of 0.5%CMHPXG solution is 3.35 times higher than that of 0.5%XG solution, and the elastic modulus, viscosity modulus and thixotropic ring area of CMHPXG solution are significantly higher than that of XG solution. The sedimentation rate of ceramsite in CMHPXG solution is much lower than that in XG solution, and the sand carrying property is improved. The apparent viscosity of 0.4%XG solution is 43.1 mPa / s at 30 鈩，

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