Stimulation Technique for MECL Heavy Oil Reservoirs in Colombia
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摘要: 针对哥伦比亚圣湖油田稠油油藏开发进入中后期,存在老井产量递减率大、新井产能不足、热采效果变差、高含水率井增多、增产措施效果不明显等问题,在通过室内试验优选发泡剂和氮气与蒸汽注入比的基础上,对泡沫调剖工艺和氮气辅助蒸汽吞吐工艺进行了优化;通过分析生产情况,制定了适应不同区块的稠油注汽转周最优时机图版;进行了高含水率水平井堵水试验。泡沫调剖8井次,平均单井日增油4.4 t,累计增油4 575 t,预计增油超8 000 t;氮气辅助蒸汽吞吐井11井次,平均单井日增油2.4 t,累计增油3 124 t,预计增油超5 000 t;Girasol区块实施优化转周后,周期递减率由18.5%降至15.0%,三个月累计增油5 680 t;A9井堵水后,含水率由100%降至65%,增油303 t。现场应用结果表明,以上增产技术措施适用于圣湖油田稠油油藏,应用以后存在的问题得到了解决,且增产效果显著。Abstract: As the development of heavy oil reservoirs of Mansarovar Oilfield in Colombia entersits the middle and late stages, some problems have emerged, such as a severe production decline in old wells, the inadequate productivity of new wells, poor thermal recovery effects, increasingly high water cut in wells in the field, and less than ideal stimulation effects.After conducting laboratory tests to select the optimal foaming agent and nitrogen/steam injection ratio, the technologies of foam profile control and nitrogen-assisted steam huff and puff were optimized.Through production analysis, the optimal timing chart of turn cycle steam injection was developed for heavy oil reservoirs in different blocks, and the water shutoff test was practiced in high water-cut horizontal well.For 8 wells with foam profile control, the average single-well oil production was 4.4 t per day, cumulative oil production was 4 575 t, and the total increased oil production was expected be over 8 000 t.For 11 wells with nitrogen assisted steam huff and puff simulation, the average single-well oil production was 2.4 t, cumulative oil production was 3 124 t, and the total increased oil production was expected to be over 5 000 t.In the Girasol Block, the optimal turn cycle steam injection resulted in a diminishing rate of 18.5% to 15% and a three-month cumulative oil increased by 5 680 t.In Well A9 after water plugging, the water cut decreased from 100% to 65%, and oil production increased by 303 t.Field application showed that the simulation technique was applicable for heavy oil reservoirs of MECL and they could yield significant results.
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Keywords:
- heavy oil reservoir /
- stimulation /
- foamer /
- profile control /
- steam soaking Mansarovar Oilfield
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