油水过渡带薄浅层特稠油微生物开发技术——以准噶尔盆地西缘春风油田为例
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摘要
为了改善准噶尔盆地西缘春风油田油水过渡带薄浅层特稠油开采效果,以油水过渡带P6-P48井为例,开展了微生物采油技术研究。P6-P48井蒸汽吞吐开采初期由于边水侵入造成高含水关井,分析认为其油藏条件适合采用微生物冷采技术。根据P6-P48井油样组成,筛选内源微生物菌种芽孢杆菌XJZ2-1、假单胞菌XJZ3-1、迪茨氏菌Z4M8-2,外源微生物菌种芽孢杆菌SLG5B10-17,营养液及激活剂。根据近井地带处理半径,设计微生物注入方案,2014年9月注入微生物菌液+营养液及激活剂865 m3后关井反应166 d,2015年3月15日开井生产,至2016年4月30日已生产405 d,产油3 464 t。微生物采油后50℃脱气原油黏度下降了58%,采出液中检测出了注入的活菌,且数量较多,表明注入菌菌种适应地层条件并生长繁殖。与16口蒸汽吞吐的邻井相比,微生物采油有效期长且具有更好的经济效益。微生物采油用于P6-P49和P6-P47井也取得较好的效果。
To improve the production effect of oil-water transitional zone in thin-shallow extra heavy oil reservoirs of Chunfeng Oilfield in western marginal area of the Junggar Basin,microbial enhanced oil recovery was studied taking the P6-P48 well of the oil-water transitional zone as an example.In the early stage of steam stimulation,the P6-P48 well was shut-in due to high water cut caused by edge water incursion,and analysis showed that its reservoir conditions are suitable for microbial cold production technology.According to the P6-P48 well oil sample composition,the study screened indigenous microbe strain of bacillus XJ2-1,aeruginosa XJ3-1,Dietz's bacteria Z4M8-2,inoculating microbes strain of bacillus SLG5B10-17,nutrient solution,and activator;and designed microbial injection scheme according to near borehole zones treatment radius.In September 2014,865 m3 of microbial bacterial liquid,nutrient solution and activator was injected and the well was shut in for 166 d of reaction time.The well-hole was opened to produce in March 15,2015,and has produced 405 d until April 30,2016,producing oil 3 464 t.The 50 ℃ degassing crude oil viscosity was decreased by 58% after microbial enhanced oil recovery,and the injected live bacteria was found in produced fluid,with more quantity,indicating that the injected bacteria are adaptive and has reproduced in formation condition.Compared with 16 adjacent wells of steam soaking,microbial enhanced oil recovery has long valid period and better economic benefit.Microbial enhanced oil recovery also got good results in the P6-P49 and P6-P47 wells.
To improve the production effect of oil-water transitional zone in thin-shallow extra heavy oil reservoirs of Chunfeng Oilfield in western marginal area of the Junggar Basin,microbial enhanced oil recovery was studied taking the P6-P48 well of the oil-water transitional zone as an example.In the early stage of steam stimulation,the P6-P48 well was shut-in due to high water cut caused by edge water incursion,and analysis showed that its reservoir conditions are suitable for microbial cold production technology.According to the P6-P48 well oil sample composition,the study screened indigenous microbe strain of bacillus XJ2-1,aeruginosa XJ3-1,Dietz's bacteria Z4M8-2,inoculating microbes strain of bacillus SLG5B10-17,nutrient solution,and activator;and designed microbial injection scheme according to near borehole zones treatment radius.In September 2014,865 m3 of microbial bacterial liquid,nutrient solution and activator was injected and the well was shut in for 166 d of reaction time.The well-hole was opened to produce in March 15,2015,and has produced 405 d until April 30,2016,producing oil 3 464 t.The 50 ℃ degassing crude oil viscosity was decreased by 58% after microbial enhanced oil recovery,and the injected live bacteria was found in produced fluid,with more quantity,indicating that the injected bacteria are adaptive and has reproduced in formation condition.Compared with 16 adjacent wells of steam soaking,microbial enhanced oil recovery has long valid period and better economic benefit.Microbial enhanced oil recovery also got good results in the P6-P49 and P6-P47 wells.
引文
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[3]王学忠,王金铸,乔明全.水平井、氮气及降黏剂辅助蒸汽吞吐技术:以准噶尔盆地春风油田浅薄层超稠油为例[J].石油勘探与开发,2013,40(1):97-102.WANG Xuezhong,WANG Jinzhu,QIAO Mingquan.Horizontal well,nitrogen and viscosity reducer assisted steam huff and puff technology:Taking super heavy oil in shallow and thin beds,Chunfeng Oilfield,Junggar Basin,NW China,as an example[J].Petroleum Exploration and Development,2013,40(1):97-102.
[4]张春英,孟凡儒,石梅,等.大庆油田微生物提高采收率的矿场试验[J].石油学报,1995,16(1):88-95.ZHANG Chunying,MENG Fanru,SHI Mei,et al.A pilot EOR test by in-situ microorganism fermentation in Daqing Oilfield[J].Acta Petrolei Sinica,1995,16(1):88-95.
[5]计秉玉.国内外油田提高采收率技术进展与展望[J].石油与天然气地质,2012,33(1):111-117.JI Bingyu.Progress and prospects of enhanced oil recovery technologies at home and abroad[J].Oil&Gas Geology,2012,33(1):111-117.
[6]路俊刚,王力,陈世加,等.准噶尔盆地三台油气田原油菌解气特征及成因[J].石油勘探与开发,2015,42(4):425-433.LU Jungang,WANG Li,CHEN Shijia,et al.Features and origin of oil degraded gas of Santai field in Junggar Basin,NW China[J].Petroleum Exploration and Development,2015,42(4):425-433.
[7]郭斌,吴晓磊,钱易.提高微生物可培养性的方法和措施[J].微生物学报,2006,46(3):504-507.GUO Bin,WU Xiaolei,QIAN Yi.Approach for increasing the culturability of microorganisims[J].Acta Microbiologica Sinica,2006,46(3):504-507.
[8]杨承志,楼诸红.微生物采油的地质基础及筛选标准[J].石油勘探与开发,1997,24(2):69-72.YANG Chengzhi,LOU Zhuhong.Screening standards and geological bases for microbial enhanced oil recovery[J].Petroleum Exploration and Development,1997,24(2):69-72.
[9]雷光伦.微生物采油技术的研究与应用[J].石油学报,2001,22(2):56-61.LEI Guanglun.The research and application of microbial enhanced oil recovery[J].Acta Petrolei Sinica,2001,22(2):56-61.
[10]穆龙新,王瑞峰,吴向红.苏丹地区砂岩油藏衰竭式开发特征及影响因素[J].石油勘探与开发,2015,42(3):347-351.MU Longxin,WANG Ruifeng,WU Xianghong.Development features and affecting factors of natural depletion of sandstone reservoirs in Sudan[J].Petroleum Exploration and Development,2015,42(3):347-351.
[11]冯庆贤,郭海莉,倪方天.本源微生物驱油技术研究与应用[J].特种油气藏,2001,8(4):84-86.FENG Qingxian,GUO Haili,Ni Fangtian.Study and application of indigenous microbial enhancement of oil recovery[J].Special Oil&Gas Reservoirs,2001,8(4):84-86.