砂砾岩油藏水平井选择性堵水剂研究及矿场试验
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1.中国石油勘探开发研究院;2.青海油田钻采工艺研究院;3.青海油田采油二厂

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中国石油天然气股份有限公司重大科技专项《柴达木盆地建设高原大油气田勘探开发关键技术研究与应用》(2016E-01)


The Research and Oilfield Trial of Horizontal Well Selective Water Shutoff Agent in Glutenite Oil Reservoir
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    摘要:

    昆北油田砂砾岩储层厚度大,平面、层间、层内非均质性强,开发初期水平井就表现出产量递减大、含水上升快的特点,迫切需要治水。基于昆北砂砾岩油藏特征及开发生产特点,合成了丙烯酰胺(AM)-2-丙烯酰胺基-2-甲基丙磺酸(AMPS)-二甲基二烯丙基氯化铵(DMDAAC)三元共聚物水平井选择性堵水剂。用流变力学实验考察了堵水剂的注入性能,用填砂管堵水模拟实验考察了堵水剂的选择性。填砂管实验表明,堵水后注入压力提高了6.06倍,水驱封堵率为83.5%,油驱封堵率为20%,具有显著的油水选择性。在室内实验研究和矿场生产特征研究的基础上,在昆北油田开展了6口水平井堵水矿场试验,取得了显著增油降水效果。

    Abstract:

    The Kunbei glutenite reservoir has thick layer and strong heterogeneity in plane, interlayer and intralayer. In the early stage of development, the horizontal well production yield decreases and water cut rises rapidly. Horizontal wells are in urgent need of water control. Based on the characteristics of Kunbei reservoir and production, Acrylamide (AM)-2-acrylamido-2-methylpropanesulfonic acid (AMPS)-dimethyldiallylammonium chloride (DMDAAC) terpolymer selective water shutoff agent for horizontal wells was synthesized. The injection performance of water shutoff agent was investigated by rheological mechanics experiment, and the selectivity of water shutoff agent was investigated by core plugging simulation experiment. The core experiment shows that the injection pressure is increased by 6.06 times after water plugging, the water flooding plugging rate is 83.5%, and the oil displacement plugging rate is 20%, which has remarkable oil-water selectivity.On the basis of laboratory experiment and well performance, the oilfield trials of water shutoff for 6 horizontal wells have been carried out in Kunbei Oilfield. The remarkable effect of increasing oil and reducing water has been gained.

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  • 收稿日期: 2020-10-29
  • 最后修改日期: 2021-02-02
  • 录用日期: 2021-02-21
  • 在线发布日期: 2021-12-24
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