Influence of Mosaic Shielding Drilling Fluid Filter Cake on the Cementing Quality of Second Interface and Improvement Method
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摘要: 固井质量的好坏是决定后期开采作业能否顺利进行的关键，钻井过程中形成的滤饼会影响固井二界面的胶结质量，因此通过固井二界面胶结强度的评价方法，分析镶嵌屏蔽钻井液滤饼对固井二界面胶结质量的影响，结合SEM和EDS进一步说明钻井液形成的虚滤饼因为其疏松的凝胶状态导致固井二界面质量降低。针对以上问题，选用脂肪醇聚氧乙烯醚（AEO）、脂肪酸山梨醇酐聚氧乙烯醚60（T60）、聚氧乙烯烷基酚醚（OP）3种渗透剂对镶嵌屏蔽钻井液滤饼进行冲洗，实验结果表明，AEO对镶嵌屏蔽钻井液滤饼的冲洗效果最好，滤饼通过AEO冲洗后，固井二界面胶结强度增大33.34%～166.67%，提高了固井二界面的胶结质量。Abstract: The quality of cementing is the key to decide whether the later mining operation can proceed smoothly. The filter cake formed during drilling will affect the cementing quality of the second interface. Therefore, this paper analyzes the influence of embedded shielding drilling fluid filter cake on the cementing quality of the second interface through the evaluation method of the cementing strength of the second interface. Combined with SEM and EDS, it further shows that the virtual filter cake formed by drilling fluid will reduce the cementing quality of the second interface because of its loose gel state. Aiming at the above problems, this paper selects AEO, T60 and OP as penetrant to flush the filter cake of embedded shielding drilling fluid. The experimental results show that AEO has the best flushing effect on the filter cake of embedded shielding drilling fluid. After the filter cake is flushed by AEO, the cementing strength of the second interface of cementing is increased by 33.34%～166.67%, which greatly improves the cementing quality of the second interface of cementing.
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表 1 油井水泥化学组成
成分 含量/% 成分 含量/% 成分 含量/% CaO 62.070 Al2O3 3.608 K2O 0.675 SiO2 20.494 MgO 1.863 SO3 3.471 Fe2O3 4.071 Na2O 0.250 TiO2 0.262 
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表 2 不同样品的胶结强度结果
岩心 胶结强度/MPa 1 d 3 d 不含钻井液滤饼的岩心 2.10 4.18 附着钻井液滤饼的岩心冲洗前 0.21 0.84 附着钻井液滤饼的岩心冲洗后 0.56 1.12
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