Ahmed Abdulmalek, Mahmoud Ahmed Abdulhamid, Elkatatny Salaheldin
College of Petroleum Engineering & Geosciences, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
ACS Omega. 2020 Dec 9;5(50):32341-32348. doi: 10.1021/acsomega.0c04261. eCollection 2020 Dec 22.
Silica flour is one of the most commonly used material in cementing oil wells at high-temperature conditions of above 230 °F to prevent the deterioration in the strength of the cement. In this study, replacement of the silica flour with the granite waste material at which an inexpensive and readily available material in cementing oil-wells is evaluated. Four cement samples with various amounts of silica flour and granite powder were prepared in this work. The effect of including the granite waste instead of silica flour in the cement elastic, failure, and petrophysical properties after curing the samples at 292 °F and 3000 psi was examined. The results revealed that replacement of the silica flour with 40% by weight of cement (BWOC) optimized the cement performance and confirmed that this concentration of granite could be used as an alternative to the silica flour in oil-well cementing. This concertation of granite slightly improved the elastic properties of the cement. It also improved the cement compressive and tensile strengths by 5.7 and 39.3%, respectively, compared to when silica flour is used. Replacement of the silica flour with 40% BWOC of granite waste also reduced the cement permeability by 64.7% and porosity by 17.9%.
硅粉是在230°F以上的高温条件下固井油井时最常用的材料之一，用于防止水泥强度下降。在本研究中，评估了用花岗岩废料替代硅粉，花岗岩废料是固井油井中一种廉价且容易获得的材料。这项工作制备了四个含有不同量硅粉和花岗岩粉的水泥样品。研究了在292°F和3000 psi下固化样品后，用花岗岩废料代替硅粉对水泥弹性、破坏和岩石物理性质的影响。结果表明，用40%重量比的水泥（BWOC）的花岗岩废料替代硅粉可优化水泥性能，并证实该浓度的花岗岩可作为油井固井中硅粉的替代品。这种浓度的花岗岩略微改善了水泥的弹性性能。与使用硅粉时相比，它还分别将水泥的抗压强度和抗拉强度提高了5.7%和39.3%。用40% BWOC的花岗岩废料替代硅粉还使水泥渗透率降低了64.7%，孔隙率降低了17.9%。
