P(ST-g-ACA)/BT复合降滤失剂的合成与性能

Synthesis and performance of P(ST-g-ACA)/BT composites as filtrate reducing agents

摘要:

以玉米淀粉、丙烯酰胺、2-丙烯酰胺基-2-甲基丙磺酸、二甲基二烯丙基氯化铵和膨润土为原料，采用单体插层原位聚合法制备了一种复合降滤失剂P(ST-g-ACA)/BT。 采用FTIR、XRD、TGA和TEM对其进行表征，对降滤失剂的降滤失性能和流变性能进行了评价，并对其降滤失机理进行了推测。结果表明，该降滤失剂具有“鸡蛋卷”结构和良好的热稳定性。当P(ST-g-ACA)/BT加量为基浆的2%（质量分数）时，淡水基浆中滤失量为4 mL（常温中压），10%盐水基浆中滤失量为22 mL（150 ℃、3.5 MPa），表明降滤失剂能提高水基钻井液的热稳定性、耐盐性和降滤失性。在10%盐水基浆中，与其他降滤失剂相比，P(ST-g-ACA)/BT降滤失效果明显。

Abstract:

A composite filter-loss reducer, P(ST-g-ACA)/BT, was prepared with corn starch, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, diallyl dimethyl ammonium chloride and bentonite by monomer intercalation. The filter-loss reducer was characterized with FTIR, XRD , TGA and TEM, the rheological properties and filtration loss of the filter-loss reducer were evaluated. In addition, the mechanism of fluid loss was presented. The results indicated that the filter-loss reducer possessed a “egg coil ” structure and a good thermal stability. Evaluation of P(ST-g-ACA)/BT in a water base drilling fluid showed that, at 2% (mass fraction) concentration of P(ST-g-ACA)/BT, the filter loss of the fresh water-based drilling fluid is 4 mL(normal temperature and medium pressure). The HTHP filter loss of the 10% salt water-based drilling fluid is 22 mL (150 ℃、3.5 MPa). Evaluation results showed that the filter-loss reducer could improve the properties of the thermal stability, salt tolerance, and fluid loss control of water-based drilling fluids. In the 10% salt water-based drilling fluid, the P(ST-g-ACA)/BT is better than other filter-loss reducers in filtration control.