WS17-2低渗砂砾岩油藏注水/注气长岩心驱替效果评价及方案优选
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摘要
岩心实验分析证实WS17-2低渗砂砾岩油藏储层具有微观非均质性强和水敏性强等特点,实施注水开发能否取得预期效果是开发方式选择的重要问题。分别采用短岩心拼接组合而成的组合长岩心、岩屑充填压实填砂管长岩心、组合全直径长岩心三种形式长岩心模型,开展了WS17-2油田流三段低渗砂砾岩油藏地层高温高压条件下注海水、注伴生气开发效果物理模拟及评价。结果表明,三种长岩心模型在水驱时均表现出较强的水敏伤害,导致注水压力过大;短岩心拼接模型和组合全直径模型注海水时均表现出突破较快,突破后驱油能力弱,提压效果差,最终采出程度低等特征,且驱油效果低于填砂管长岩心模型;相同长岩心模型下,注海水与注伴生气最终采出程度接近,但相同的注入量下注海水效果更好;海水驱后转注气驱可有效利用注入气的增溶膨胀、抽提、降黏、低张力作用,使原油采出程度在水驱基础上增加8~16个百分点;转注伴生气效果好于干气。实验结果可为此类海上低渗砂砾岩油藏的开发提供技术参考。
Core experiment analysis shows that low permeability glutenite reservoir of WS17-2 oilfield has the characteristics ofstrong microscopic heterogeneity and water sensitivity, accordingly, whether water flooding can achieve expected effects is an im-portant criterion for selecting development schemes. This paper adopts three kinds of long core models, such as short core splicedlong core model, core debris filled and compacted sand-filled long core model, and spliced full-diameter long core model, carriesout physical simulation and evaluation of development effects by sea water and associated gas injection under high temperature andpressure of Liu-3 low permeability glutenite reservoir in WS17-2 oilfield. The results show that, the three long core models behavestrong water sensitive damage during water flooding, which causes big injection pressure, and in addition, during the injection ofsea water, short cores spliced model and spliced full-diameter core model break through very fast and then have low oil displace-ment ability, poor raise pressure effects, and low final recovery efficiency, furthermore, its displacement efficiency is lower thanthat of sand filled long core model. In the same long core model, the final recovery rates of sea water flooding and gas flooding areclose, however, in the same injection rate, the final recovery rates of sea water flooding is better. In the scenario of sea water flood-ing and then gas flooding, the advantages of gas injection such as expanding oil, extracting oil, reducing viscosity and low interfa-cial tension can be fully taken, thereby increasing oil recovery rate by 8 to 16 percentages on the basis of water flooding, and in ad-dition, the effects of converting associated gas are apparently better than converting dry gas. The results can provide technical refer-ences for the development of such offshore low permeability glutenite reservoir.
Core experiment analysis shows that low permeability glutenite reservoir of WS17-2 oilfield has the characteristics ofstrong microscopic heterogeneity and water sensitivity, accordingly, whether water flooding can achieve expected effects is an im-portant criterion for selecting development schemes. This paper adopts three kinds of long core models, such as short core splicedlong core model, core debris filled and compacted sand-filled long core model, and spliced full-diameter long core model, carriesout physical simulation and evaluation of development effects by sea water and associated gas injection under high temperature andpressure of Liu-3 low permeability glutenite reservoir in WS17-2 oilfield. The results show that, the three long core models behavestrong water sensitive damage during water flooding, which causes big injection pressure, and in addition, during the injection ofsea water, short cores spliced model and spliced full-diameter core model break through very fast and then have low oil displace-ment ability, poor raise pressure effects, and low final recovery efficiency, furthermore, its displacement efficiency is lower thanthat of sand filled long core model. In the same long core model, the final recovery rates of sea water flooding and gas flooding areclose, however, in the same injection rate, the final recovery rates of sea water flooding is better. In the scenario of sea water flood-ing and then gas flooding, the advantages of gas injection such as expanding oil, extracting oil, reducing viscosity and low interfa-cial tension can be fully taken, thereby increasing oil recovery rate by 8 to 16 percentages on the basis of water flooding, and in ad-dition, the effects of converting associated gas are apparently better than converting dry gas. The results can provide technical refer-ences for the development of such offshore low permeability glutenite reservoir.
引文
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[2]昝灵,王顺华,张枝焕,等.砂砾岩储层研究现状[J].长江大学学报:自然版,2011,8(3):63-66.
[3]胡复唐.砂砾岩油藏开发模式[M].北京:石油工业出版社,1997:21-25.
[4]杨丽娟,乔俊,王天福,等.胜坨地区下降盘沙四上亚段沉积储层特征研究[J].油气藏评价与开发,2015,5(2):7-10.
[5]罗明高.碎屑岩储层结构模态的定量模型[J].石油学报,1991,12(4):27-38.
[6]Patzek T W.Verification of a complete pore network simulator of drainage and imbibition[J].SPE-71310-PA,2001,6(2):144-156.
[7]Rogers J P.New reservoir model from an old oil field:Garfield conglomerate pool,Pawnee County,Kansas[J].Aapg Bulletin,2007,91(10):1349-1365.
[8]魏漪.砂砾岩油藏注水开发模式研究[D].北京:中国石油大学,2006.
[9]王洋,王建,徐宁蔚.苏北低渗透注水开发油田开发效果评价[J].油气藏评价与开发,2011,1(5):34-39.
[10]刘云利.夏9井区特低渗砂砾岩高含水期油藏治理研究与应用[J].中国石油和化工标准与质量,2014,34(2):203-203.
[11]李士伦,孙雷,郭平,等.再论我国发展注气提高采收率技术[J].天然气工业,2006,26(12):30-34.
[12]刘玉明,孙雷,杨凯雷,等.WZ11-7海上低渗油田保压开采驱替方式实验评价研究[J].油气藏评价与开发,2014,4(5):34-39.
[13]孙宝泉,孙宁.人造填砂模型在稠油高温相对渗透率实验中的应用[J].新疆石油天然气,2011,7(3):66-67.
[14]王进安,袁广均,张军,等.长岩心注二氧化碳驱油物理模拟实验研究[J].特种油气藏,2004,8(2):75-78.
[15]朱玉双,曲志浩,蔺方晓,等.油层受水敏伤害时水驱油渗流特征[J].石油学报,2004,25(2):59-64.