密闭取心三相流体饱和度半解析校正方法
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摘要
密闭取心是获取油藏饱和度的重要手段,但是在岩心上提过程中,由于受到岩心和流体的弹性能变化以及降压脱气作用,含油饱和度存在一定的损失,需要对其实验室测定值进行校正。利用油、气、水三相分流量的原理和稳定逐次替代方法,建立了半解析饱和度校正模型,通过将降压过程微元化,完整地计算了岩心在上提过程中的流体饱和度变化过程。利用孤东油田密闭取心资料,通过与数值模拟对比,最大误差仅为1. 62%,验证了建立的饱和度校正模型的准确性。该研究为判断油藏水淹状态、提高油藏开发水平,提供了重要的依据。
Pressure coring is considered as an important means to obtain reservoir saturation. The elastic rock-fluid change,depressurization and degassing generally results in a certain loss of oil saturation during the lifting process.It is necessary to correct the laboratory measured oil saturation. A semi-analytical saturation correction model was established on the basis of the oil-gas-water three-phase fractional flow principle and steady successive substitution. The whole fluid saturation changing performance during core lifting process was completely calculated through micronizing the depressurization process. The pressure coring data in Gudong Oilfield was compared with numerical simulation and the maximum relative error is 1. 62%,which verified the validity of fluid saturation correction model.This research could provide certain reference for the reservoir flooding evaluation and improve development performance.
Pressure coring is considered as an important means to obtain reservoir saturation. The elastic rock-fluid change,depressurization and degassing generally results in a certain loss of oil saturation during the lifting process.It is necessary to correct the laboratory measured oil saturation. A semi-analytical saturation correction model was established on the basis of the oil-gas-water three-phase fractional flow principle and steady successive substitution. The whole fluid saturation changing performance during core lifting process was completely calculated through micronizing the depressurization process. The pressure coring data in Gudong Oilfield was compared with numerical simulation and the maximum relative error is 1. 62%,which verified the validity of fluid saturation correction model.This research could provide certain reference for the reservoir flooding evaluation and improve development performance.
引文
[1]任杰,唐敬,陈彬,等.应用产剖资料确定非均匀水淹层剩余油饱和度[J].大庆石油地质与开发,2017,36(3):137-140.
[2]惠威,贾昱昕,程凡,等.苏里格气田东部盒8储层微观孔隙结构及可动流体饱和度影响因素[J].油气地质与采收率,2018,25(5):10-16.
[3]梁尚斌.多轮次压降试井求取含油饱和度研究[J].特种油气藏,2016,23(5):82-85.
[4]王晓强,吴承美,李文波,等.多方法水淹层综合识别技术及效果评价[J].新疆石油天然气,2016,12(4):78-82.
[5]李虎成,田宗强,王小勇,等.密闭取心技术在疏松地层的成功应用[J].中国高新科技,2017,1(8):61-63.
[6]李佩武,王建军.密闭取心技术在超深井元坝123井应用[J].钻采工艺,2016,39(6):91-93.
[7]李伟强,尹太举,邓智浩,等.萨尔图油田北二西区密闭取心井水洗特征[J].油气地质与采收率,2016,23(1):101-106.
[8]马力宁,李江涛,华锐湘,等.保压取心储层流体饱和度分析方法---以柴达木盆地台南气田第四系生物成因气藏为例[J].天然气工业,2016,36(1):83-87.
[9]焦霞蓉,江山,杨勇,等.油藏工程方法定量计算剩余油饱和度[J].特种油气藏,2009,16(4):48-50.
[10]易贵华,易明,谢勇,等.密闭取心技术[J].新疆石油天然气,2008,4(4):46-50.
[11]王丽忱,甄鉴,张露.钻井取心技术现状及进展[J].石油科技论坛,2015,34(2):44-50.
[2]惠威,贾昱昕,程凡,等.苏里格气田东部盒8储层微观孔隙结构及可动流体饱和度影响因素[J].油气地质与采收率,2018,25(5):10-16.
[3]梁尚斌.多轮次压降试井求取含油饱和度研究[J].特种油气藏,2016,23(5):82-85.
[4]王晓强,吴承美,李文波,等.多方法水淹层综合识别技术及效果评价[J].新疆石油天然气,2016,12(4):78-82.
[5]李虎成,田宗强,王小勇,等.密闭取心技术在疏松地层的成功应用[J].中国高新科技,2017,1(8):61-63.
[6]李佩武,王建军.密闭取心技术在超深井元坝123井应用[J].钻采工艺,2016,39(6):91-93.
[7]李伟强,尹太举,邓智浩,等.萨尔图油田北二西区密闭取心井水洗特征[J].油气地质与采收率,2016,23(1):101-106.
[8]马力宁,李江涛,华锐湘,等.保压取心储层流体饱和度分析方法---以柴达木盆地台南气田第四系生物成因气藏为例[J].天然气工业,2016,36(1):83-87.
[9]焦霞蓉,江山,杨勇,等.油藏工程方法定量计算剩余油饱和度[J].特种油气藏,2009,16(4):48-50.
[10]易贵华,易明,谢勇,等.密闭取心技术[J].新疆石油天然气,2008,4(4):46-50.
[11]王丽忱,甄鉴,张露.钻井取心技术现状及进展[J].石油科技论坛,2015,34(2):44-50.