陕北三叠系特低渗透高矿化度油藏聚合物驱油效果分析  

ANALYSIS OF EFFECT OF POLYMER FLOODING IN TRIASSIC EXTRA-LOW PERMEABILITY RESERVOIRS WITH HIGH SALINITY IN NORTHERN SHANXI OILFIELD

作　　者：李永太[1] 温哲豪[2] 

机构地区：[1]西安石油大学石油工程学院 [2]长庆油田第一采油厂

出　　处：《钻采工艺》2007年第3期36-39,共4页Drilling & Production Technology

基　　金：国家"西部开发"科技行动重大攻关计划项目;编号:2005BA901A13

摘　　要：陕北安塞油田已进入中、高含水期的三叠系延长组油藏孔隙度11.00%～13.25%,渗透率(0.96～2.90)×10-3μm2,地层水矿化度89.2g/L,地层原油粘度1.96～2.80mPa.s。低渗透、低压、低产和结垢是原油生产的主要特点。该油田最早投入开发的WY区平均含水率已达76.7%。2005年初选用分子量900×104,浓度300～600mg/L的PAM溶液实施了聚合物驱先导试验。开注聚合物4～7个月后,各试验井组平均含水率下降了4个百分点,日增油累计3.4t。The geologic features of Triassic Yanchang formation in Ansai Oilfieid are extra-low permeability(0.96×10-3～2.90×10-3μm2),extra-low porosity(11.00%～13.25%),high salinity(89850mg/L)etc. Low permeability, low pressure and scaling are main characteristics of crude production. The oilfield development has entered into the medium/high water cut stages. The first polymer flooding injection pilot test has obtained evident effect in the oil reservoirs of C6 Formation of test block of Ansai in 2005. It is shown that the oil production increased from 18.3t/d to 21.7t/d in Wangyao test block, total water cut in the test block can be reduced from 48.8% to 44.8%.

关 键 词：特低渗透油藏 高含盐油藏 聚合物驱油 先导试验 陕北油田 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]