应用科技
應用科技
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YING YONG KE JI
2015年
2期
58-60,74
,共4页
郑继龙%翁大丽%苗钰琦%陈平%宋志学%李娟
鄭繼龍%翁大麗%苗鈺琦%陳平%宋誌學%李娟
정계룡%옹대려%묘옥기%진평%송지학%리연
氮气%驱替实验%水气交替%低渗油藏%BZ25-1油田%采收率
氮氣%驅替實驗%水氣交替%低滲油藏%BZ25-1油田%採收率
담기%구체실험%수기교체%저삼유장%BZ25-1유전%채수솔
nitrogen%displacement experiment%water-gas alternation%low-permeability reservoir%BZ25-1 Oilfield%oil recovery
BZ25-1油田沙二段储层经过长期注水开发,已进入高含水开发后期,水驱采收率偏低。通过分析气水交替注入提高采收率的作用机理,在物模实验研究的基础上提出采用N2水交替注入实现BZ25-1油田沙二段储层的挖潜控水。实验结果表明,N2水交替注入采收率较单纯水驱采收率提高3.63%。受渗透率非均质性的影响,注入水主要进入高渗透层驱油,并很快从高渗透层突破且含水上升快。注N2综合采收率较水驱略低,主要是N2从高渗透层突破后,降低了低渗透层的驱油效率。 N2水交替驱在一定程度上能改善流度比,降低渗透率非均质性带来的影响,增加驱油效率。
BZ25-1油田沙二段儲層經過長期註水開髮,已進入高含水開髮後期,水驅採收率偏低。通過分析氣水交替註入提高採收率的作用機理,在物模實驗研究的基礎上提齣採用N2水交替註入實現BZ25-1油田沙二段儲層的挖潛控水。實驗結果錶明,N2水交替註入採收率較單純水驅採收率提高3.63%。受滲透率非均質性的影響,註入水主要進入高滲透層驅油,併很快從高滲透層突破且含水上升快。註N2綜閤採收率較水驅略低,主要是N2從高滲透層突破後,降低瞭低滲透層的驅油效率。 N2水交替驅在一定程度上能改善流度比,降低滲透率非均質性帶來的影響,增加驅油效率。
BZ25-1유전사이단저층경과장기주수개발,이진입고함수개발후기,수구채수솔편저。통과분석기수교체주입제고채수솔적작용궤리,재물모실험연구적기출상제출채용N2수교체주입실현BZ25-1유전사이단저층적알잠공수。실험결과표명,N2수교체주입채수솔교단순수구채수솔제고3.63%。수삼투솔비균질성적영향,주입수주요진입고삼투층구유,병흔쾌종고삼투층돌파차함수상승쾌。주N2종합채수솔교수구략저,주요시N2종고삼투층돌파후,강저료저삼투층적구유효솔。 N2수교체구재일정정도상능개선류도비,강저삼투솔비균질성대래적영향,증가구유효솔。
After long-time water-flooding exploitation , BZ25-1 oilfield has entered the later stage of high-water-cut exploitation and the water drive recovery efficiency is rather low .Based on the analysis of the oil recovery enhance-ment mechanism by means of water-alternating-gas injection , and physical model experiment , this paper put for-ward the method of adopting N 2-alternating-water injection for achieving high-water-cut production of BZ 25-1 oil-field.The experimental results show that , compared with the pure water-flooding oil recovery , the oil recovery real-ized by N2-alternating-water injection may increase by 3.63%.Due to the influence of anisotropy of permeability , the injected water mainly enters the oil layer with high permeability and quickly breaks through the oil layer with high permeability , and the water cut rises rapidly .Because the N 2 reduces the oil displacement efficiency of low permeable formation when it breaks through the oil layer with high permeability , the recovery efficiency after injec-ting the N2 is lower than injecting water.N2-alternating-water flooding can improve mobility ratio , reduce the effects of heterogeneity of the permeability and increase oil displacement efficiency .