多功能抗高温防塌剂研究及应用

针对复杂井的井壁稳定问题,开发出一种多功能抗高温防塌剂YFF。通过封堵实验、页岩滚动回收实验、抑制性实验,考察了多功能抗高温防塌剂YFF的性能,并进行了现场应用。实验结果表明,多功能抗高温防塌剂YFF带有正电荷,具有良好的抑制作用和封堵能力,加入2%YFF后,岩屑回收率从35.3%(空白)增至92.5%,1%膨润土的膨胀容由92 mL降至71 mL;抗高温(200℃)降滤失效果好,对钻井液流变性能影响小;加入3%YFF的聚合物钻井液(配方为4%膨润土浆+0.2%Na2CO3+0.2%KPAM絮凝剂+2%降滤失剂SPC+0.5%降滤失剂LV-CMC+3%降滤失剂SMP-1+2%封堵剂FT-1+1%降滤失剂SYP-1)对岩心封堵率达95%以上,且反排后的渗透率恢复率达95%以上。现场应用结果表明,YFF与钻井液具有良好的配伍性,对钻井液的黏度、切力影响不大,能有效稳定井壁及保护储层。

Development and Application of a Multifunctional and Thermally Stable Inhibitor

To solve complicated downhole problems caused by wellbore instability,a thermally stable inhibitor YFF was developed,and the relative properties were investigated through inhibition test,plugging test,moreover,the effect of the field application of YFF was mentioned.The experiment results showed that YFF had positive charge and had a good inhibitory ability and plugging property.After adding 2% YFF,the cutting recovery increased from 35.3%(blank group) to 92.5%;while the expansion volume of 1% bentonite decreased form 92 mL(blank group) to 71 mL.The YFF had very good capacities of depressing the filter loss under high temperature of 200℃,however,which had little effects on rheological property of the drilling fluid.The plugging rate of the core was higher than 95% after treated by the polymer drilling fluid,4% bentonite+0.2% Na2CO3+0.2% flocculants KPAM+2%filtration reducing agent SPC+0.5%filtration reducing agent LV-CMC+3%filtration reducing agent SMP-1+2% plugging agent FT-1+1% filtration reducing agent SYP-1+3%YFF,moreover,the permeability restoration was high up to 95%.The field application indicated that YFF had good cooperation with the drilling fluids,as a result,wellbore stability and reservoir protection was realized by adding YFF.