摘要
从3种有机酸铬中选择一种烯基多元羧酸铬为交联剂,用于交联大庆油田三元复合驱油体系,制备弱凝胶调驱剂。以阻力系数(RF)特别是残余阻力系数(RRF)作为性能参数筛选调驱剂各组分的用量,得到了基本配方(以g/L计)如下:HPAM(M=1.2×107,HD=25%)0.9+交联剂(有效成分50%)0.18+表面活性剂(ORS41)3+碱(NaOH)8+稳定剂0.2,用大庆某三元复合驱试验区污水(矿化度3824mg/L)配液,其RRF值为清水(矿化度890mg/L)弱凝胶的～45%。基本配方弱凝胶45℃下7天时粘度18.3mPa·s,RF值81.2,RRF值8.2,随时间而减小,120天时分别为12.8mPa·s,66.1和7.3;油水界面张力仍在10-3mN/m数量级,只比常规三元复合体系略高;体系中表面活性剂在油砂上的静态吸附量为0.495mg/g油砂,比常规三元复合体系的相应值(0.462mg/g油砂)略高;岩心流动实验中测得的表面活性剂滞留量(0.067和0.070mg/g岩心)也高于常规三元复合体系的相应值(0.054和0.059mg/g岩心)。若用Na2CO3代替NaOH,则碱剂浓度可由6～8g/L提高到8～10g/L。表8参4。
A chromium unsaturated polycarboxylate is selected from 3 organic acid chromium salts as crosslinker for ASP combinational flooding solution to prepare weak gel profiling/displacing agent. According to the determinations of resistance factor (RF) and residual resistance factor (RRF) the use levels of ingredients in gelling solutions are optimized and a basic formula is obtained as follows: HPAM (M=1.2×10~7, HD=25%), 0.90 g/L; crosslinker (containing 50% active substances), 0.18 g/L; surfactant ORS41, (3.0 g/L); alkaline NaOH, 8.0 g/L; stabilizer, 0.20 g/L in recycled produced water of salinity 3 824 mg/L from an ASP combinational flood experimental area in Daqing. The RRF value of the formulated basic weak gel is of ～45% of that for the same gel in fresh water (salinity 890 mg/L). The basic weak gel formed at 45℃ in 7 days has viscosity 18.3 mPa·s, RF value 81.2, and RRF value 8.2 and these characteristics, decreasing wioh time, acount in 120 days 12.8 mPa·s, 66.1, and 7.3, respectively. For the basic gel, the interfacial tension has magnitude of 10^(-3) mN/m and slightly higher than that for the standard ASP solution. The static adsorption of surfactant ORS41 on reservoir sand from the basic gel is of 0.495 mg/g sand, a value slightly higher than that from the standard ASP solution (0.462 mg/g sand). The retention of ORS41 in reservoir cores determined in core flow experiments of the basic gel, being of (0.067) and 0.070 mg/g core, is higher in some extent than that of the standard ASP solution (0.054 and 0.059 mg/g core). Replacing NaOH by Na_2CO_3 leads to raising alkaline concentration in the basic formula from 6.0—8.0 to 8.0—(10.0 g/L).
出处
《油田化学》
CAS
CSCD
北大核心
2004年第1期61-63,71,共4页
Oilfield Chemistry
关键词
表面活性剂
HPAM/Cr^+3弱凝胶
调驱剂
聚合物溶液
调剖技术
驱油技术
alkaline/surfactant/polymer(AS) flooding solution
alkaline/surfactant/crosslinked polymer gel
weak gel
profiling/oil displacing agent
formulations
performance properties
Daqing oil fields
