稠油油藏聚驱后采出液脱水用破乳剂

Demulsifier for Dehydrating Heavy Crude Oil from Flowing Gel Flooded Blocked Reservoir Ze-70

泽70断块稠油油藏实施可流动聚合物凝胶驱后，采出液脱水困难，使用一种常规聚驱后采出液破乳剂，加量1000mg／L，60℃时脱水率只有30％，脱出水含油最高达20％。研制了由30％～70％多亚乙基多胺起始嵌段聚醚，25％～65％TDI扩链的酚醛树脂起始嵌段聚醚及0．05％～2％N-乙基全氟辛基磺酰胺聚氧乙烯醚组成、干剂含量为45％～65％的水基破乳剂。给出了制备两种嵌段聚醚的原料配方。按基本配方制备的破乳剂样品，有3种在55℃下加量100mg／L时，对泽70断块混合原油样的90min脱水率分别为96．3％、958％、95．3％，脱出水清，油水界面齐；改变加量（30～150mg／L）在50℃考察脱水性能，求得最佳加量为100mg/L，此加量的3种破乳剂90min脱水率分别为96．4％、95．3％、94、2％。将有效物含量55％的第一种破乳剂投入现场试应用，加量80mg／L时脱水原油含水小于0．2％，脱出污水含油小于50mg／L。表2参1。

A flowing gel flood project was started in heavy and viscous oil blocked reservoir Ze-70, Huabei, and led to serious difficulties in oil-water separation of produced fluid by a standard demulsifier for produced fluid of postpolymerflooded reservoirs： the dehydration rate （DR） at dosage 1.0 g/L at 60℃ was as low as 30% and the oil content in separated produced water was as high as 20%. A water base demulsifier containing 45--65 % active substances, which composed of 30--70 % polyethylenepolyamine initiated blockpolyether, 25--65% phenolic resine initiated block-polyether, chain extended by TDI, and 0.05--2% N-ethyl perfloroocthyl sulfoamide polyoxyethylene, is developed and the starting materials recipes for preparing these block-polyethers are presented. Of 13 demulsifier samples prepared by using the basic recipes, 3 samples in dehydrating Ze-70＇s mixed crude oil at dosage 100 mg/L and at 55℃ give the highest values of DR in 90 min： 96.3%, 95.8%, and 95.3%, respectively, high quality separated water, and sharp oil/water interfaces; their optimal dosage appears to be 100 mg/g as shown in dehydrating the same crude oil at 50℃ with varying demulsifier dosage 30-150 mg/L, in which the highest values of DR in 90 min, 96.4% ,95.3%, and 94.2%, are obtained at dosage 100 mg/L. The first demulsifier, containing 55 % active substances, is chosen and put into a field trial, which leads to following results at dosage 80 mg/L： water cut of separated crude oil 〈0.2% ; oil content in separated water 〈 50 mg/L.