基于启动压力梯度的低渗含水气藏渗流规律研究
|
摘要
以苏里格气田某低渗致密气藏储层岩样为例,通过室内气驱水两相渗流物理模拟实验研究,发现高含水饱和度的低渗储层启动压力梯度效应明显,流体呈非达西渗流,气井开采中后期容易出现水锁现象;根据气相启动压力梯度变化规律,建立其考虑渗透率和含水饱和度影响的数学表征预测模型,这对于相邻区块或岩性及孔隙结构接近的储层均具有较好的适用性。
Taking a rock sample of a low permeability tight gas reservoir in the Sulige gas field as an example,a physical simulation experiment of gas flooding two-phase seepage is carried out.The results indicate that threshold pressure gradient effect which water saturation is high in low permeability reservoirs with is very obvious,the fluid is non-Darcy seepage,and the water lock phenomenon is easy to occur in the middle and late stages of gas well mining.According to the change law of gas phase threshold pressure gradient,a gas threshold pressure gradient prediction model with math expression based on permeability and water saturation is established,which has good applicability to adjacent areas or reservoirs with similar lithology and pore structure.
Taking a rock sample of a low permeability tight gas reservoir in the Sulige gas field as an example,a physical simulation experiment of gas flooding two-phase seepage is carried out.The results indicate that threshold pressure gradient effect which water saturation is high in low permeability reservoirs with is very obvious,the fluid is non-Darcy seepage,and the water lock phenomenon is easy to occur in the middle and late stages of gas well mining.According to the change law of gas phase threshold pressure gradient,a gas threshold pressure gradient prediction model with math expression based on permeability and water saturation is established,which has good applicability to adjacent areas or reservoirs with similar lithology and pore structure.
引文
[1]胡勇,郭长敏,徐轩,等.砂岩气藏岩石孔喉结构及渗流特征[J].石油实验地质,2015,37(3):390-393.
[2]喻建,马捷,路俊刚,等.压汞—恒速压汞在致密储层微观孔喉结构定量表征中的应用[J].石油实验地质,2015,37(6):789-795.
[3]冯文光.天然气非达西低速不稳定渗流[J].天然气工业,1986,6(3):41-48.
[4]刘高波,刘荣和,冯文光,等.低渗透气藏非达西渗流研究[J].大庆石油地质与开发,2007,26(1):65-67.
[5]李传亮,朱苏阳.再谈启动压力梯度[J].岩性油气藏,2013,25(4):1-5.
[6]章星,杨胜来,张洁,等.致密低渗气藏启动压力梯度实验研究[J].特种油气藏,2011,18(5):103-104,134,141.
[7]郭平,徐永高,陈召佑,等.对低渗气藏渗流机理实验研究的新认识[J].天然气工业,2007,27(7):86-88.
[8]ZHU W,SONG H,HUANG X,et al. Pressure charac-teristics and effective deployment in a water-bearingtight gas reservoir with low-velocity non-Darcy flow[J]. Energy&Fuels,2011,25(3):1111-1117.
[9]刘晓旭,胡勇,李宁,等.低渗砂岩气藏气体特殊渗流机理实验研究与分析[J].特种油气藏,2007,14(1):80-83.
[10]刘善华,廖伟,周辉,等.新场须家河组气藏气水两相渗流启动压力梯度实验研究[J].石油地质与工程,2011,25(6):115-117.
[11]Miller R J,Low P F. Threshold gradient for waterflow in clay systems[J]. Soil Science Society of A-merica Proceedings,1963,27(6):606-609.
[12]朱维耀,宋洪庆,何东博,等.含水低渗气藏低速非达西渗流数学模型及产能方程研究[J].天然气地球科学,2008,19(5):685-689.
[13]郑小敏,成志刚,林伟川,等.致密砂岩气藏启动压差与可动水变化规律实验研究[J].测井技术,2014,38(1):33-38.
[14]吕恒宇.大牛地气田大47-大70井区山西组储层特征研究[D].成都理工大学,2013.
[15]黄亮,石军太,杨柳,等.低渗气藏启动压力梯度实验研究及分析[J].断块油气田,2016,23(5):610-614.
[16]徐轩,胡勇,田姗姗,等.低渗致密气藏气相启动压力梯度表征及测量[J].特种油气藏,2015,22(4):78-81.
[17]朱华银,付大其,卓兴家,等.低渗气藏特殊渗流机理实验研究[J].天然气勘探与开发,2009,32(3):39-41.
[18]徐轩,王继平,田姗姗,等.低渗含水气藏非达西渗流规律及其应用[J].西南石油大学学报(自然科学版),2016,38(5):90-96.
[2]喻建,马捷,路俊刚,等.压汞—恒速压汞在致密储层微观孔喉结构定量表征中的应用[J].石油实验地质,2015,37(6):789-795.
[3]冯文光.天然气非达西低速不稳定渗流[J].天然气工业,1986,6(3):41-48.
[4]刘高波,刘荣和,冯文光,等.低渗透气藏非达西渗流研究[J].大庆石油地质与开发,2007,26(1):65-67.
[5]李传亮,朱苏阳.再谈启动压力梯度[J].岩性油气藏,2013,25(4):1-5.
[6]章星,杨胜来,张洁,等.致密低渗气藏启动压力梯度实验研究[J].特种油气藏,2011,18(5):103-104,134,141.
[7]郭平,徐永高,陈召佑,等.对低渗气藏渗流机理实验研究的新认识[J].天然气工业,2007,27(7):86-88.
[8]ZHU W,SONG H,HUANG X,et al. Pressure charac-teristics and effective deployment in a water-bearingtight gas reservoir with low-velocity non-Darcy flow[J]. Energy&Fuels,2011,25(3):1111-1117.
[9]刘晓旭,胡勇,李宁,等.低渗砂岩气藏气体特殊渗流机理实验研究与分析[J].特种油气藏,2007,14(1):80-83.
[10]刘善华,廖伟,周辉,等.新场须家河组气藏气水两相渗流启动压力梯度实验研究[J].石油地质与工程,2011,25(6):115-117.
[11]Miller R J,Low P F. Threshold gradient for waterflow in clay systems[J]. Soil Science Society of A-merica Proceedings,1963,27(6):606-609.
[12]朱维耀,宋洪庆,何东博,等.含水低渗气藏低速非达西渗流数学模型及产能方程研究[J].天然气地球科学,2008,19(5):685-689.
[13]郑小敏,成志刚,林伟川,等.致密砂岩气藏启动压差与可动水变化规律实验研究[J].测井技术,2014,38(1):33-38.
[14]吕恒宇.大牛地气田大47-大70井区山西组储层特征研究[D].成都理工大学,2013.
[15]黄亮,石军太,杨柳,等.低渗气藏启动压力梯度实验研究及分析[J].断块油气田,2016,23(5):610-614.
[16]徐轩,胡勇,田姗姗,等.低渗致密气藏气相启动压力梯度表征及测量[J].特种油气藏,2015,22(4):78-81.
[17]朱华银,付大其,卓兴家,等.低渗气藏特殊渗流机理实验研究[J].天然气勘探与开发,2009,32(3):39-41.
[18]徐轩,王继平,田姗姗,等.低渗含水气藏非达西渗流规律及其应用[J].西南石油大学学报(自然科学版),2016,38(5):90-96.