Preparation of Nanoparticle Calcium Carbonate and Study of Its Use in Water Base Drilling Fluids
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摘要: 为了改善水基钻井液流变和滤失性能,采用表面原位聚合法制备了阴离子聚丙烯酰胺(APAM)表面修饰的碳酸钙纳米颗粒(CaCO3/APAM),并将其用于改善水基钻井液性能。对CaCO3/APAM结构进行了红外光谱(FTIR)、扫描电镜(SEM)等表征。流变和滤失实验表明,纳米颗粒的加入有效地提高了水基钻井液在低剪切速率下的黏度,钻井液剪切稀释性能得到提高。在80℃下,添加1% CaCO3/APAM的水基钻井液流性指数为0.72,动切力为0.45 Pa,滤失量为22.2mL,与基浆相比有显著改善。钻井液耐盐滤失表明,当盐浓度为1%时,添加1% CaCO3/APAM使钻井液滤失量降低了21.2%。滤饼微观形貌分析显示纳米颗粒通过填充于滤饼微孔隙中提高了滤饼致密性,使得滤失量下降。Abstract: To improve the rheology and filtration property of water base drilling fluids, a nanoparticle calcium carbonate surface modified with anionic polyacrylamide (APAM), CaCO3/APAM, has been prepared through surface in-situ polymerization. The CaCO3/APAM was characterized using FTIR and SEM to determine its molecular structures. In laboratory experiment, a water base drilling fluid treated with CaCO3/APAM had increased viscosity at low shear rate, indicating that the addition of CaCO3/APAM is helpful in improving the shear-thinning property of water base drilling fluids. At 80℃, a water base drilling fluid treated with 1% CaCO3/APAM had flow index of 0.72, yield point of 0.45 Pa and filter loss of 22.2 mL, three properties that were better than those of the base fluid. Addition of 1% CaCO3/APAM in a water base drilling fluid containing 1% salt reduced the filter loss of the drilling fluid by 21.2%. Analysis of the micro-structure of the mud cake showed that the nanoparticles, by filling into the spaces among the particles forming the mud cakes, improved the compactness of the mud cakes, thereby reducing the filter loss of the mud.
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Key words:
- Water base drilling fluid /
- Nanoparticle calcium carbonate /
- Rheology /
- Filter loss /
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