摘要
针对油水层复杂、渗透率高、含水上升快的陆9K1h油藏,在室内通过筛选增粘能力和抗剪切能力较强的疏水缔合聚合物作为调剖用凝胶主剂,采用酚醛类作为交联剂,研制的凝胶体系(AP-BC)表观黏度可达11×104mPa.s,并具有较好的稳定性;经多孔介质剪切后凝胶成胶时间延长50%,胶体强度降低小于10%,稳定性更好,老化5个月未见脱水现象;在相同渗透性的油、水饱和的填砂管实验中,AP-BC凝胶更易封堵水层。由于陆9K1h油藏具有底水、薄层的特点,因此采用了"垫+调+堵"多段塞深部封堵的工艺,通过逐渐提高弱凝胶的强度,促使高强度堵剂得到合理的放置,实现对高渗透大孔道的封堵作用,提高注水开发的波及效果。现场试验表明,7个井组中,对应油井在调剖后第2个月到第6个月期间见到了明显增油效果。
According to 9K1h reservoir with complex oil/water layers,high permeability and fast water cut increasing,hydrophobic associating polymer with strong viscosity increasing and anti-shearing capacity is screened out as main agent and phenol-formaldehyde is used as crosslinking agent.Thus,a weak gel is developed.The strength of AP-BC gel is up to 11×104 mPa·s.After porous media shearing,the gelation time is prolonged by 50% and the strength of the gel is reduced by 10%,and the stability of the gel is much better.The dehydration phenomenon is not observed after 5 months.An experiment using two sand packs in parallel connection is conducted and the two sand packs with the same permeability which is saturated with oil and water respectively.The results show that this gel is more likely to block water layer.According to the 9 K1h reservoir with bottom water and thin formation,multi-slug in-depth plugging technology is utilized,which includes gradually improve the strength and puts the gel with high strength in suitable allocation.High capacity channels can be plugged by using this technology so that displacing efficiency of water flooding can be improved.Field test shows that obvious oil increasing effect is realized by applying profile control in oil wells from second month to sixth months.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第4期134-137,共4页
Journal of Southwest Petroleum University(Science & Technology Edition)
关键词
疏水缔合聚合物
弱凝胶
稳定性
封堵能力
合理放置
hydrophobic associating polymer
weak gel
stability
plugging capacity
suitable allocation
