高30断块油藏S/P二元复合驱室内实验研究

Lab test of S/P EOR technology in the reservoir of fault block Gao 30

黄小会 李华斌 程柯扬 田小兰 乔林

Huang Xiaohui Li Huabin Cheng Keyang Tian Xiaolan Qiao Lin

成都理工大学油气藏地质及开发工程国家重点实验室, 四川成都 610059

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Techology, Chengdu 610059

针对高30断块砂岩油藏,筛选和评价了表面活性剂/聚合物(S/P)二元复合驱油体系。结果表明,表面活性剂CDS-1在有效浓度(0.025%~0.300%)低而宽的范围内,体系与原油的界面张力可降到能大幅度提高驱油效率的10-2mN/m数量级;当疏水缔合聚合物HNT201-3浓度为1 250 mg/L、CDS-1浓度为0.05%时,体系在地层条件下的表观黏度可达72.37 mPa°s。在模拟油层渗透率及非均质变异系数的岩心上,注入0.30 PV二元复合体系及0.10 PV聚合物保护段塞时,可比水驱提高采收率20.91%OOIP。

Surfactant/polymer (S/P) systems are screened and evaluated at 90℃ in the reservoir of fault block Gao 30 in Huabei oilfield in this paper.The results indicate that the interfacial tension between the chemical solution and crude oil could be lowered to the magnitude of 10-2 mN/m of which residual oil saturation could be obviously reduced, as surfactant CDS-1 active concentration ranged from 0.025% to 0.300%.Apparent viscosity of the chemical solution could be 72.37 mPa°s if 1 250 mg/L hydrophobically associating polymer HNT201-3 is added into 0.05% CDS-1 connate.Results of core displacement test, whose reservoir permeability and heterogeneous variation coefficient are identical with those of the reservoir, show that the oil recovery could be increased by 20.91% OOIP than water flood when 0.30 PV chemical slug size and 0.10 PV polymer buffer are injected into Dy nasty-Parson Cores.

https://doi.org/10.3969/j.issn.1008-2336.2010.01.072