| QK17-2油田注N2-WAG提高采收率可行性实验研究 |
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| 引用本文： | 王长权,孙雷,任延涛,石立红,潘毅.QK17-2油田注N2-WAG提高采收率可行性实验研究[J].海洋地质译丛,2010(3):64-67,77. |
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| 作者姓名： | 王长权 孙雷 任延涛 石立红 潘毅 |
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| 作者单位： | [1]西南石油大学,四川成都610500 [2]中海油田服务股份有限公司,天津塘沽300452 [3]四川大学,四川成都610065 |
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| 摘 要： | 气水交替驱（WAG）是增加油田水驱后的波及体积和减弱气驱过程因油气黏度差异而产生的气体指进现象的有效方法。QK17-2油田为注水开发油田,目前油田综合含水率已超过80%,已经进入开发中后期的高含水时期。针对QK17-2油田水驱后面临高含水、产油量下降的问题,通过地层流体相态实验、注N2膨胀实验、细管实验、长岩心驱替实验,研究注水后再注N2-WAG可进一步提高采收率的可行性。结果表明,单纯注N2效果不佳,注N2-WAG采收率较单纯水驱采收率提高4.46%~6.24%,而长岩心驱替在带倾角条件下注N2-WAG采收率较单纯水驱提高11%~12.58%,可见由油藏高点注N2-WAG采收率将有明显提高。
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| 关 键 词： | 提高采收率 注氮气 气水交替驱 机理研究 |
Feasibility laboratory study on EOR by nitrogen-water alternate injection flooding in QK17-2 Oilfield |
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| Authors: | Wang Changquan Sun Lei Ren Yantao Shi Lihong Pan Yi |
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| Institution: | 1.Southwest Petroleum University,Chengdu 610500,2.Oilfield Services Ltd.,CNOOC,Tanggu 300452;3.Sichuan University,Chengdu 610065) |
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| Abstract: | Water alternating gas flooding（WAG） is the effective way to increase the swept volume after waterflooding and weaken the fingering phenomenon generated by the viscosity difference.QK17-2 is a waterflooding oil field.It＇s total water cut was more than 80 percent,which enters high water content period of mid-late development.QK17-2 oilfield faces the problems of high water content and low oil yield after waterflooding.In order to solve these problems,laboratory experiments have been carried out,including the phase state of formation fluid,nitrogen injection expansion,slim tube and long core displacement experiment.Through the results of experiments,the feasibility of EOR by N2WAG after waterflooding was analyzed.It turned out that the effect of N2-WAG is the best,followed by waterflooding while the effect of nitrogen injection is the worst.The recovery of N2-WAG without dip angle and with dip angle is increased by 4.46%～6.24% and 11%～12.58% respectively than waterflooding.It is concluded that the recovery of N2-WAG with dip angle is the highest. |
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| Keywords: | EOR nitrogen injection WAG mechanism study |
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