Performance Evaluation and Sand Suppression Mechanism of Chemical Sand Stabilizer for Unconsolidated Sandstone Reservoir
The unconsolidated sandstone reservoir of western oilfields in South China Sea has loose cementation and is easy to produce sand.In the middle and later stage of development,with the in-crease of water content,sensitive minerals will expand,disperse and migrate when encountering wa-ter.The production differential pressure is further increased especially when measures of changing the pump to extract liquid are taken,resulting in sand production and affecting the productivity of oil wells.Relevant experimental research on sand stabilizer ZJ-1 is carried out,and the results show that the system has good sand suppression performance.The particle size of sand sample increases greatly after being treated with sand stabilizer,and the median particle size after being treated with sand stabilizer is 7.3 times that of blank sample;in the sand bed filtration experiment,compared with the blank sample,the filtrate treated with sand stabilizer is much clearer and the turbidity value is much smaller;in the sand filling tube displacement experiment,the sand production before sand stabilizer treatment is higher,and the calculated sand production rate is 3.873%,and the sand pro-duction is lower after sand stabilizer treatment,the calculated sand production rate is 0.045%,meeting sand production requirements of electric pump wells in offshore oil fields.The possible sand suppression mechanism of sand stabilizer ZJ-1 is analyzed and revealed through microscope observa-tion experiment and scanning electron microscope experiment.Relevant research results have impor-tant guiding significance for chemical sand control and stable production of similar reservoirs.
western oilfield in South China Seaunconsolidated sandstone reservoirsand stabiliz-ersand suppression performancesand suppression mechanism
万方数据
维普
