环保水基钻井液用聚合物M-TSP的合成与性能评价

Synthesis and Performance Evaluation of Polymer M-TSP for Environment-friendly Water-based Drilling Fluids

孙 欢 陈 华 贾彦强

SUN Huan，CHEN Hua，JIA Yanqiang

针对环保水基钻井液在应用中存在流变性能不理想、滤失量较高、稳定性较差、与常规添加剂配伍性差和滤液对储层伤害较大的问题，以马来酸酐、罗望子胶（TSP）和三乙胺为主要原料制得天然可生物降解聚合物改性罗望子胶（M-TSP），在质量分数为4.5%的膨润土悬浮液中加入不同浓度的M-TSP得到聚合物膨润土悬浮液，研究了M-TSP膨润土悬浮液的流变性、稳定性、滤失性、配伍性及对岩心的伤害程度。研究表明：膨润土悬浮液中添加质量分数1.0%的M-TSP后悬浮液的流变性较好，且M-TSP能显著提升膨润土的静态悬浮能力。膨润土悬浮液中添加质量分数1%的M-TSP与常规的环保钻井液添加剂具有良好的配伍性；M-TSP加量为1.0%时，质量分数为4.5%的膨润土悬浮液的初滤时间为121 s，30 min的滤失量为1.7 mL，起到明显的降滤失作用；M-TSP对砂岩岩心的伤害率仅有2.06%~3.23%，能最大程度减少对储层的伤害。合成的M-STP可应用于环保钻井液钻井工程。

Aimed at the problems of non-ideal rheological property，high filtration，insufficient stability，poor compatibility with conventional additives，great damage of filtrate to reservoir permeability in the application of environment-friendly water-based drilling fluids，a natural biodegradable polymer-modified tamarind seed polysaccharide（M-TSP）was prepared using maleic anhydride，tamarind seed polysaccharide（TSP）and triethylamine as main raw materials. M-TSP was added to the bentonite suspension with mass fraction of 4.5% to obtain polymer bentonite suspension，the rheological property，stability，filtration，compatibility，and damage to the core of polymer bentonite suspension were carried out. The results showed that the bentonite suspension added with 1% M-TSP had good rheological property and stability. bentonite suspension added with 1% M-TSP had good compatibility with the conventional additives of environment-friendly drilling fluids. when adding 1% M-TSP，the initial filtration time of the polymer bentonite suspension was 121 s and the filtration was only 1.7 mL within 30 min，showing good filtration loss performance. The damage rate of M-TSP to sandstone core was only 2.06%— 3.23%，indicating that M-TSP had less damage to core. The M-STP is promising to be applied in environment-friendly water-based drilling engineering.

10.19346/j.cnki.1000-4092.2021.01.003