疏松砂岩油藏深部稳砂体系配方设计与应用

针对油藏充填砂的治理,研制了一种新型的防膨抑砂剂NTW-1。室内性能评价表明,防膨抑砂剂具有防膨和抑砂能力,其效果分别优于目前常用的其它抑砂剂或粘土稳定剂的平均水平10.5%和65.6%,同时现场使用简便、成本较低。根据油藏出砂机理,提出了“深部稳砂”新观点,以合成的防膨抑砂剂NTW-1为基础,研究了“深部稳砂”新体系配方,现场应用表明,与常规措施相比,该体系增强了充填砂与骨架砂间的结合力,阻止了深部充填砂的运移,缩小了出砂空间,防砂成功率和有效期分别提高了8.8%和37.3%,单井增油平均提高了46.2%。

Design and Application of Deep Sand Firming Formula in Unconsolidated Sandstone

The backing sand can affect oil production by entering the borehole with formation fluid during the development of unconsolidated sandstone.In view of the backing sand problem,we developed a new antiswe-lling and sand inhibiting agent NTW-1.In-door evaluation of the performance indicated that it had both antiswelling and sand inhibiting abilities and a better effect than other common sand inhibiting agents and clay inhibitors by 10.5% and 65.6% in average,and it could be used easily and economically in the field.A new idea of deep sand firming was proposed according to reservoir sanding mechanism,and a new formula developed on the basis of the composite agent NTW-1.The system could enhance the binding force between backing sand and framework sand,and inhibit the migration of deep backing sand,and reduce sanding room.The success rate and life of sand controlling were enhanced by 8.8% and 37.3%,respectively,and the oil production rate was increased by 46.2%.