(CN109236253) Method for displacing remaining oil with microbial activation oil pool and cross-linked polymer 机翻标题: 暂无翻译,请尝试点击翻译按钮。

源语言标题
(CN109236253) Method for displacing remaining oil with microbial activation oil pool and cross-linked polymer
公开号/公开日
CN109236253CN109236253 / 2020-07-072019-01-18
申请号/申请日
CN201811040945 / 2018-09-07
发明人
ZHANG ZHONGZHIZHANG ZHIYONGLUO YIJINGSUN SHANSHAN;
申请人
CHINA UNIVERSITY OF PETROLEUM (BEIJING);
主分类号
IPC分类号
E21B-043/22
摘要
(CN109236253) The invention discloses a method for displacing remaining oil with a microbial activation oil pool and a cross-linked polymer. According to the method, a profile control system is injected into a first slug of an injection well along a reservoir water drive mainstream line, and then a microbial activating agent is injected into the slug unremittingly; according to the above mode, the profile control system and the microbial activating agent are injected into 3-5 slugs in order; water injection continues to be carried out for 3 months at water injection speed lower than 50% of original water injection speed; and a micro cross-linked polymer solution is injected into the slug for oil driving. The method for displacing the remaining oil with the microbial activation oil pool and the cross-linked polymer solves the problem that remaining oil, especially attic oil near an existing oil pool is difficult to drive, improves the liquidity of the remaining oil, and improves the oil recovery ratio.
机翻摘要
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地址
代理人
(CN109236253B) HAN JINGMAN ; AN, TIAN, ZHANG & PARTNERS Reg. Nb: 11339 SUN XIAOBIN ; AN, TIAN, ZHANG & PARTNERS Reg. Nb: 11339
代理机构
;
优先权号
2018CN-1040945
主权利要求
(CN109236253) 1.一种微生物活化油藏及交联聚合物驱替剩余油的方法,其特征在于,包括如下步骤:   (1)在注入井第一段塞沿油藏水驱主流线注入调剖体系,再不间断在该段塞内注入微生物激活剂;   (2)依步骤(1)的方式,依序注入3-5个段塞;   (3)以低于原来50%的注水量继续注水3个月;   (4)向段塞内注入微胶联聚合物溶液进行驱油;   所述调剖体系总用量为高渗透层孔隙体积的0.55-0.6PV,所述微生物激活剂的总用量为0.25-0.3PV;   所述步骤(1)中在第一段塞注入调剖体系1,其为高等强度延缓交联调剖体系,其由聚合物、交联剂及延缓剂组成,所述聚合物浓度0.25-0.3%,交联剂浓度0.1-0.11%,延缓剂浓度0.045-0.05%,所述调剖体系1注入量为高渗透层孔隙体积的0.15-0.2PV,该步骤注入微生物激活剂1,其用量为高渗透层孔隙体积的0.05-0.1PV;   所述调剖体系1是由浓度为0.25-0.3%的部分水解聚丙烯酰胺与柠檬酸铝按质量比30:1交联反应制成;   所述步骤(2)中在第二段塞注入调剖体系2,其为中等强度延缓交联调剖体系,其由聚合物、交联剂及延缓剂组成,所述聚合物浓度0.18-0.2%,交联剂浓度0.09-0.1%,延缓剂浓度0.025-0.03%,所述调剖体系2的注入量为高渗透层孔隙体积的0.05-0.1PV,该段塞注入微生物激活剂2,其用量为高渗透层孔隙体积的0.045-0.05PV;   所述步骤(2)中在第三段塞注入调剖体系3,其为中等强度延缓交联调剖体系,其注入量为高渗透层孔隙体积的0.05-0.1PV,该段塞注入微生物激活剂3,其用量为高渗透层孔隙体积的0.045-0.05PV;   所述步骤(2)共注入四个段塞的调剖体系和微生物激活剂,在第四段塞注入调剖体系4,其为高等强度延缓交联调剖体系,其注入量为高渗透层孔隙体积的0.15-0.2PV,该段塞注入微生物激活剂4,其用量为高渗透层孔隙体积的0.05-0.1PV。 2.根据权利要求1所述的一种微生物活化油藏及交联聚合物驱替剩余油的方法,其特征在于,所述微生物激活剂的浓度经过侯选油藏内源微生物培养获得,其按质量配比为:0.35%~0.38%的玉米浆干粉、0.45%~0.5%的(NH4)2HPO4、0.25%~0.3%的NaNO3,其余为水,油藏内源微生物浓度大于104-105个/mL。 3.根据权利要求1所述的一种微生物活化油藏及交联聚合物驱替剩余油的方法,其特征在于,所述步骤(4)中的微胶联聚合物溶液为浓度为0.1-0.15%的部分水解聚丙烯酰胺和浓度为0.026-0.035%乙酸铬溶液配制而成。 4.根据权利要求3所述的一种微生物活化油藏及交联聚合物驱替剩余油的方法,其特征在于,所述微胶联聚合物溶液的注入量为油藏孔隙体积的0.4-0.45PV。
法律状态
GRANTED
专利类型码
BA
国别省市代码
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