超低渗油藏在线分流酸化增注技术研究与应用
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摘要
酸化是超低渗油藏最有效的增注措施之一,但由于储层物性差、非均质性强等问题,造成目前常规酸化措施普遍具有施工周期长、有效率低、有效作用距离短等不足,且酸化过程中存在指进现象和储层二次伤害。针对这一问题,选取鄂尔多斯盆地环江油田三叠系超低渗油藏为研究对象,提出了在线分流酸化技术,并配套研制了一种多元缓速螯合酸COA-1S和一种新型的水溶性分流剂COA-1P。通过室内评价实验和在线分流酸化模拟实验,发现该技术在缓速性、配伍性、水溶性、螯合能力和暂堵功能等方面均显著优于常规酸化;现场先导性实验结果表明,酸化后剖面吸水均匀程度从28. 5%上升至50. 9%,视吸水指数增加2倍左右,降压增注效果显著;同时,该技术还具有"不停井、不泄压、不动管柱、不返排"的特点,简化了常规分流酸化工序、降低了安全环保风险,是一种能够很好地适应超低渗油藏特征的酸化增注技术。
Acidification is one of the most effective injection stimulation methods in the ultra-low permeability reservoirs.These reservoirs however,are usually characterized with poor physical property and high heterogeneity,leading to an unnecessarily long operation period,low efficiency,and insufficient effectively-operating distance for conventional acidification measures,as well as fluid fingering and secondary damage to the reservoir during the acidizing process. In this regard,we studied the Triassic ultra-low permeability reservoir in the Huanjiang oilfield,Ordos Basin,proposed the online diversion acidizing technology and developed COA-1 S achelating acid system and COA-1 P,a new water soluble diversion agent. After a large number of laboratory experiments,we found that,compared with the conventional acidizing method,this new technology is more retardant,compatible,water-soluble,and better at chelating and temporary blocking. In-situ pilot test has shown that the homogeneity of the water absorption profile has increased from 28. 5% to 50. 9%,that is,the water injectivity index doubled after the implementation of this technology. Meanwhile,its characteristics of "zero well shut-off and depressurization,zero impact on the tubing strings,and zero flow-back",allows this technology to simplify the operation process of diversion and acidification,reduce the risks in security and environment protection,and thus can be recommended as a new acidification technology for stimulating injection of wells in the ultra-low permeability reservoirs.
Acidification is one of the most effective injection stimulation methods in the ultra-low permeability reservoirs.These reservoirs however,are usually characterized with poor physical property and high heterogeneity,leading to an unnecessarily long operation period,low efficiency,and insufficient effectively-operating distance for conventional acidification measures,as well as fluid fingering and secondary damage to the reservoir during the acidizing process. In this regard,we studied the Triassic ultra-low permeability reservoir in the Huanjiang oilfield,Ordos Basin,proposed the online diversion acidizing technology and developed COA-1 S achelating acid system and COA-1 P,a new water soluble diversion agent. After a large number of laboratory experiments,we found that,compared with the conventional acidizing method,this new technology is more retardant,compatible,water-soluble,and better at chelating and temporary blocking. In-situ pilot test has shown that the homogeneity of the water absorption profile has increased from 28. 5% to 50. 9%,that is,the water injectivity index doubled after the implementation of this technology. Meanwhile,its characteristics of "zero well shut-off and depressurization,zero impact on the tubing strings,and zero flow-back",allows this technology to simplify the operation process of diversion and acidification,reduce the risks in security and environment protection,and thus can be recommended as a new acidification technology for stimulating injection of wells in the ultra-low permeability reservoirs.
引文
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[12]马丽萍,张涛,杨立华,等.自转向酸酸化体系的室内研究及现场应用[J].海洋石油,2017,40(3):90-93.Ma Liping,Zhang Tao,Yang Lihua,et al. The laboratory research on self-diverting acidizing and its application in oil field[J]. Offshore Oil,2017,4(3):90-93.
[13] Taylor D,Kumar P S,Fu D,et al. Viscoelastic surfac-tant based selfdiverting acid for enhanced stimulation in carbonate reservoirs[J].SPE82263,2003.
[14]王世彬,王浩儒,郭建春,等.砂岩储层酸化自转向酸研究与应用[J].油田化学,2015,32(4):490-493.Wang Shibin,Wang Haoru,Guo Jianchun,et al. Research and application of self-diverting mud acid in sandstone reservior acidizing[J].Oilfield Chemistry,2015,32(4):490-493.
[2]王香增,张丽霞,李宗田,等.鄂尔多斯盆地延长组陆相页岩孔隙类型划分方案及其油气地质意义[J].石油与天然气地质,2016,37(1):1-7.Wang Xiangzeng,Zhang Lixia,Li Zongtian,et al. Pore type classification scheme for continental Yanchang shale in Ordos Basin and its geological significance[J]. Oil&Gas Geology,2016,37(1):1-7.
[3]陈文,袁学芳,郭建春,等.多氢酸深部分流酸化技术在东河油田的应用研究和效果评价[J].石油与天然气化工,2011,40(3):285-288.Chen Wen,Yuan Xuefang,Guo Jianchun,et al. Application and evaluation on multi-hydro acid deep diversion acidizing technology in Donghe oil-field[J]. Chemical Engineering Oil&Gas,2011,40(3):285-288.
[4]周军良,胡勇,李超,等.渤海A油田扇三角洲相低渗储层特征及物性控制因素[J].石油与天然气地质,2017,38(1):71-78.Zhou Junliang,Hu Yong,Li Chao,et al. Characteristics and controlling factors of fan delta facies low permeability reservoirs in Bohai A oilfield,the Bohai Bay Basin[J]. Oil&Gas Geology,2017,38(1):71-78.
[5]刘欣,赵立强,杨寨,等.不动管柱酸化工艺在渤海油田的应用[J].石油钻采工艺,2004,26(5):47-49.Liu Xin,Zhao liqiang,Yang Zhai,et al. Application of acidizing technology with original production string in Bohai oilfield[J]. Oil Drilling&Production Technology,2004,26(5):47-49.
[6] Fan Y,Economides M J. Fracturing fluid leak off and net pressure behavior in fracture stimulation[J]. SPE29988,1995.
[7]高鹏宇,刘平礼,刘晖,等.水溶性化学微粒分流剂SA-2的实验研究[J].钻井液与完井液,2012,29(3):67-70.Gao Pengyu,Liu Pingli,Liu Hui,et al. Research on water soluble micro-particle diverting agent SA-2[J]. Drilling Fluid and Completion Fluid,2012,29(3):67-70.
[8]刘平礼,刘义刚,赵立强,等.渤海高渗高孔油田酸化分流技术研究及应用[J].西南石油学院学报,2005,27(1):52-56.Liu Pingli,Liu Yigang,Zhao Liqiang,et al. Study and application on acidizing high permeability&high porosity reservoir in Bohai bay Oil-field[J]. Journal of Southwest petroleum institute,2005,27(1):52-56.
[9] Water N,Jairo L,Ataur M,et al. Multilayered reservoir stimulation:Case study of effective acid diversion achieved using the associative polymer treatment diverting agent in Khuff carbonate reservoir wells in saudi Arabia's Ghawar field[J]. SPE123442,2009.
[10]刘平礼,李凤,兰夕堂,等.海上砂岩储层新型自转向酸液体系研究[J].钻采工艺,2017,40(3):90-93.Liu Pingli,Li Feng,Lan Xitang,et al. Development of new self-diverting acid for sandstone reservoirs offshore[J]. Drilling&Production Technology,2017,40(3):90-93.
[11] Liu M,Zhang S,Mou J,et al. Diverting mechanism of viscoelastic surfactant based self-diverting acid and its simulation[J]. Journal of Petroleum Science and Engineering,2013,105:91-99.
[12]马丽萍,张涛,杨立华,等.自转向酸酸化体系的室内研究及现场应用[J].海洋石油,2017,40(3):90-93.Ma Liping,Zhang Tao,Yang Lihua,et al. The laboratory research on self-diverting acidizing and its application in oil field[J]. Offshore Oil,2017,4(3):90-93.
[13] Taylor D,Kumar P S,Fu D,et al. Viscoelastic surfac-tant based selfdiverting acid for enhanced stimulation in carbonate reservoirs[J].SPE82263,2003.
[14]王世彬,王浩儒,郭建春,等.砂岩储层酸化自转向酸研究与应用[J].油田化学,2015,32(4):490-493.Wang Shibin,Wang Haoru,Guo Jianchun,et al. Research and application of self-diverting mud acid in sandstone reservior acidizing[J].Oilfield Chemistry,2015,32(4):490-493.