库车山前致密砂岩凝析气藏高效低伤害压裂改造技术
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摘要
库车山前致密砂岩凝析气藏兼具低渗致密气藏与凝析气藏的特点,储层物性差,水锁强,在一定温压条件下,地层易发生反凝析现象,造成油锁伤害;且地层伊/蒙混层及丝片状、毛发状伊利石含量高,水敏性强。这些特点成为储层改造的难点。对于低渗致密凝析气藏,目前常规压裂技术设计与施工工艺普遍缺乏针对性,压裂效果差。为此,根据该区块特点,采用自生热增能压裂液,优化黏土稳定剂、防液锁剂、防乳破乳剂等关键添加剂的配方,并对压裂设计、返排工艺进行优化,现场实施效果良好,实现了对该储层的高效低伤害改造。
The tight sandstone condensate gas reservoir in Kuqa foreland has features of poor reservoir property,strong water lock damage,high content of illite-smectite mixed-layer mineral and filamentous hair-like illite,and strong water sensitivity. Because of small difference between formation pressure and dew point pressure,paraffin precipitation is occurred in production testing,which causes retrograde condensation and fluid-blocking damage. This will bring a great challenge to reservoir stimulation. At present,the fracturing technology for such complex gas reservoirs is not mature.Based on the features of study reservoir,by using in-situ generating heat and increasing energy fracturing fluid,screening on key additives of clay stabilizer,water blocking prevention agent,demulsifier,etc.,and optimizing the design of fracturing and the flowback technology,it has been realized high efficiency and low damage stimulation of reservoir.
The tight sandstone condensate gas reservoir in Kuqa foreland has features of poor reservoir property,strong water lock damage,high content of illite-smectite mixed-layer mineral and filamentous hair-like illite,and strong water sensitivity. Because of small difference between formation pressure and dew point pressure,paraffin precipitation is occurred in production testing,which causes retrograde condensation and fluid-blocking damage. This will bring a great challenge to reservoir stimulation. At present,the fracturing technology for such complex gas reservoirs is not mature.Based on the features of study reservoir,by using in-situ generating heat and increasing energy fracturing fluid,screening on key additives of clay stabilizer,water blocking prevention agent,demulsifier,etc.,and optimizing the design of fracturing and the flowback technology,it has been realized high efficiency and low damage stimulation of reservoir.
引文
[1]薛洪刚.LFS低渗致密凝析气藏渗流及储层伤害研究[D].西南石油大学,2017:1-2.
[2]BENNION DB,THOMAS FB.Formation damage issues impacting the productivity of low permeability,low Initial water saturation gas producing formations[J].Journal of Energy Resources Technology,2005,127(3):240-247.
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[4]蔡卓林,王佳,林铁军,等.新型类泡沫压裂液体系的研究及应用[J].钻采工艺,2013,36(3):97-100.
[5]张绍彬,叶仲斌,陈洪,等.地下自动发泡的新型类泡沫压裂液研究及现场应用[J].钻采工艺,2008,31(3):103-105.
[6]宋燕高,王兴文,慈建发,等.线性自生热泡沫压裂液研制及其在油井中的应用[J].精细石油化工进展,2010,11(11):6-9.
[7]彭轩,刘蜀知,蔡长宇,等.高凝油油藏自生热压裂井筒温度场计算模型[J].石油学报,2003,24(4):69-72.
[8]李小刚,谢信捷,杨兆中,等.特低渗凝析气藏复合解堵技术应用[J].油气藏评价与开发,2017,7(3):44-49.
[9]刁素,尹琅,栗铁峰,等.凝析气藏压裂测试新技术[J].大庆石油地质与开发,2016,35(1):86-88.
[10]肖丽仙,杜建芬,郭平,等.凝析气藏反凝析污染研究[J].断块油气田,2009,16(4):102-104.
[2]BENNION DB,THOMAS FB.Formation damage issues impacting the productivity of low permeability,low Initial water saturation gas producing formations[J].Journal of Energy Resources Technology,2005,127(3):240-247.
[3]沈海超,胡晓庆.非均质低渗凝析气藏压裂后低效原因分析及改进措施研究[J].特种油气藏,2012,19(2):116-119.
[4]蔡卓林,王佳,林铁军,等.新型类泡沫压裂液体系的研究及应用[J].钻采工艺,2013,36(3):97-100.
[5]张绍彬,叶仲斌,陈洪,等.地下自动发泡的新型类泡沫压裂液研究及现场应用[J].钻采工艺,2008,31(3):103-105.
[6]宋燕高,王兴文,慈建发,等.线性自生热泡沫压裂液研制及其在油井中的应用[J].精细石油化工进展,2010,11(11):6-9.
[7]彭轩,刘蜀知,蔡长宇,等.高凝油油藏自生热压裂井筒温度场计算模型[J].石油学报,2003,24(4):69-72.
[8]李小刚,谢信捷,杨兆中,等.特低渗凝析气藏复合解堵技术应用[J].油气藏评价与开发,2017,7(3):44-49.
[9]刁素,尹琅,栗铁峰,等.凝析气藏压裂测试新技术[J].大庆石油地质与开发,2016,35(1):86-88.
[10]肖丽仙,杜建芬,郭平,等.凝析气藏反凝析污染研究[J].断块油气田,2009,16(4):102-104.
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