Combining natural and synthetic fibers as fillers to improve Ghana's Portland cement for oil wells

Solomon Asante-Okyere, Kelvin Ofori Ayisi, Gabriel Osborne Osae Darko
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Abstract

Cementing is a crucial operation in the oil and gas industry, where Portland cement is commonly used. However, locally produced Portland cement in Ghana falls short of meeting the rigorous standards required for oil well cementing. The study examined the effects of adding coconut fiber and fiberglass to the cement slurry to improve its rheological and compressive strength properties. The free fluid content, rheological properties, and compressive strength of the filler incorporated in local Portland cement slurries were monitored. The outcome of the experimental procedures indicates that incorporating these fibers significantly enhances the mechanical performance of the cement, with a marked increase in compressive strength values ranging from 6.31 MPa (0 % fibers) to 14.60 MPa (1.25 % coconut fiber and 1.25 % fiber glass) which meets the API requirement for an oil well. The rheological properties indicated an increased plastic viscosity ranging from 58 mPa s (0 % fibers) to 91.5 mPa s (1.25 % coconut fiber and 1.25 % fiberglass) and decreased yield point ranging from 31.36 pa (0 % fiber) to 22.74 pa (1.25 % coconut fiber and 1.25 % fiberglass). The free fluid content decreased from 1.39 % (0 % fiber) to 0.75 % (1.25 % coconut fiber and 1.25 % fiberglass). Therefore, this research highlights the potential of natural and synthetic fibers to enhance the performance of local Portland cement, contributing to efficient and a more cost effective cementing solutions in the oil and gas industry in Ghana.
结合天然纤维和合成纤维作为填料,改进加纳油井用波特兰水泥
固井在油气行业是一项至关重要的作业,通常使用波特兰水泥。然而,加纳当地生产的波特兰水泥达不到油井固井所需的严格标准。研究了在水泥浆中加入椰子纤维和玻璃纤维对水泥浆流变学和抗压强度的影响。监测了掺入当地波特兰水泥浆料的填料的自由流体含量、流变性能和抗压强度。实验结果表明,加入这些纤维显著提高了水泥的力学性能,抗压强度值显著提高,从6.31 MPa(0%纤维)到14.60 MPa(1.25%椰子纤维和1.25%玻璃纤维),达到了油井的API要求。流变学性能表明,塑料粘度从58 mPa s(0%纤维)增加到91.5 mPa s(1.25%椰子纤维和1.25%玻璃纤维),屈服点从31.36 pa(0%纤维)到22.74 pa(1.25%椰子纤维和1.25%玻璃纤维)下降。游离液含量由1.39%(0 %纤维)降至0.75%(1.25%椰子纤维和1.25%玻璃纤维)。因此,这项研究强调了天然纤维和合成纤维在提高当地波特兰水泥性能方面的潜力,为加纳的石油和天然气行业提供了高效且更具成本效益的固井解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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