考虑水平段长度与储层倾角的边水气藏见水时间预测新模型
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摘要
目前,广泛应用于边水气藏见水时间的计算模型主要是基于直井且忽略储层倾角推导而来,未综合考虑水平井水平段长度与储层倾角对计算模型的影响,随着气藏开发中水平井应用的不断增多,地层复杂性不断增大,现有模型的计算结果必然误差较大。针对这一问题,基于流体力学和气水两相渗流理论,在考虑水平段长度、储层倾角等因素的情况下,利用水平井渗流模型得到压力场分布,通过舌进速度反演见水时间,推导出倾斜地层条件下边水气藏水平井见水时间预测新模型,并进行了敏感性分析。现场实例计算分析表明,新模型的计算结果相对误差小于10%,相比于常用计算模型,精度提高了20%~29%。敏感性分析表明,见水时间与水平段长度呈线性关系,水平段长度每增加10 m,见水时间增加230 d;见水时间与储层倾角基本属二次抛物线关系,储层倾角小于5°时影响并不显著,在储层倾角大于5°时见水时间增长迅速。研究成果对于边水气藏水平井的高效开发与合理配产具有一定的指导意义。
Current popular models for calculating water breakthrough time are established based on vertical wells without considering the influences of horizontal section length and dip angles on water coning. With the increasing of horizontal well and formation complexity in gas reservoir development,the current popular models cannot accurately predict the water breakthrough time of these wells. In order to solve the problem,based on fluid dynamics and seepage theory,a new mathematical model considering horizontal section length and dip angles was established based on the physical model and combining the pressure distribution and water-coning velocity formula. It is indicated from the case calculation analysis that the calculation error of this new model is less than 10%,which accuracy is 20% ~ 29% higher than those of current popular models. And it is shown from sensitivity analysis that the water breakthrough time is in linear relation with horizontal section length. The water breakthrough time increases 230 d for every 10 m. Furthermore,the water breakthrough time is basically in quadratic parabola relationship with dip angle. When dip angle is less than 5°,the factor is not apparent. When dip angle is more than 5°,the breakthrough time increases rapidly. The research results can provide necessary technical supports for high-efficiency development of gas reservoirs with edge water.
Current popular models for calculating water breakthrough time are established based on vertical wells without considering the influences of horizontal section length and dip angles on water coning. With the increasing of horizontal well and formation complexity in gas reservoir development,the current popular models cannot accurately predict the water breakthrough time of these wells. In order to solve the problem,based on fluid dynamics and seepage theory,a new mathematical model considering horizontal section length and dip angles was established based on the physical model and combining the pressure distribution and water-coning velocity formula. It is indicated from the case calculation analysis that the calculation error of this new model is less than 10%,which accuracy is 20% ~ 29% higher than those of current popular models. And it is shown from sensitivity analysis that the water breakthrough time is in linear relation with horizontal section length. The water breakthrough time increases 230 d for every 10 m. Furthermore,the water breakthrough time is basically in quadratic parabola relationship with dip angle. When dip angle is less than 5°,the factor is not apparent. When dip angle is more than 5°,the breakthrough time increases rapidly. The research results can provide necessary technical supports for high-efficiency development of gas reservoirs with edge water.
引文
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2张烈辉,严谨,李允,等.考虑凝析油析出时的底水凝析气藏见水时间预测新方法.天然气工业,2004;24(7):74-75Zhang Liehui,Yan Jin,Li Yun,et al.New method to predict condensing effect on water breakthrough in condensate reservoirs with bottom water.Natural Gas Industry,2004;24(7):74-75
3王会强,李晓平,杨琪,等.底水气藏见水时间预测方法.新疆石油地质,2007;28(1):92-93Wang Huiqiang,Li Xiaoping,Yang Qi,et al.A prediction of water breakthrough time in gas reservoirs with bottom water.Xinjiang Petroleum Geology,2007;28(1):92-93
4赵新智,朱圣举.低渗透带隔板底水油藏油井见水时间预测.石油勘探与开发,2012;39(4):471-474Zhao Xinzhi,Zhu Shengju.Prediction of water breakthrough time for oil wells in low-permeability bottom water reservoirs with barrier.Petroleum Exploration and Development,2012;39(4):471-474
5黄全华,陆云,付云辉,等.考虑非达西效应的底水气藏见水时间预测方法.科学技术与工程,2016;16(14):137-139Huang Quanhua,Lu Yun,Fu Yunhui,et al.An approach to predict water breakthrough time of gas reservoirs with bottom water in consideration of non-Darcy flow.Science Technology and Engineering,2016;16(14):137-139
6 Sobocinski D P,Cornelius A J.A correlation for predicting water coning time.Journal of Petroleum Technology,1965;17(5):594-600
7 Kuo M C T.A simplified method for water coning predictions.SPEAnnual Technical Conference and Exhibition.San Francisco:Society of Petroleum Engineers,1983:1-14
8王会强,李晓平,吴锋,等.边水气藏气井见水时间预测方法.特种油气藏,2008;15(4):73-74Wang Huiqiang,Li Xiaoping,Wu Feng,et al.Prediction of water breakthrough time in gas reservoirs with edge water.Special Oil and Gas Reservoirs,2008;15(4):73-74
9吴克柳,李相方,张公涛,等.考虑反凝析的边水凝析气藏见水时间预测新方法.科学技术与工程,2011;11(19):4574-4577Wu Keliu,Li Xiangfang,Zhang Gongtao,et al.A novel approach to predict water breakthrough time in gas condensate reservoir with edge water considering retrograde condensation.Science Technology and Engineering,2011;11(19):4574-4577
10杨芙蓉,樊平天,贺静,等.边水气藏高产气井见水时间预测方法.科学技术与工程,2013;13(29):8745-8747Yang Furong,Fan Pingtian,He Jing,et al.An approach to predict water breakthrough time in high gas rate wells of gas reservoirs with edge water.Science Technology and Engineering,2013;13(29):8745-8747
11汪周华,王子敦,邓丹,等.考虑重力及气体非达西效应影响的边水气藏边水突破时间预测模型.石油钻采工艺,2016;38(2):210-215Wang Zhouhua,Wang Zidun,Deng Dan,et al.Model for prediction of edge-water breakthrough time in reservoirs with edge water with consideration to effects of gravity and non-Darcy effect of gases.Oil Drilling&Production Technology,2016;38(2):210-215
12李元生,杨志兴,藤赛男,等.考虑储层倾角和水侵的边水气藏见水时间预测研究.石油钻探技术,2017;45(1):91-96Li Yuansheng,Yang Zhixing,Teng Sainan,et al.A novel method for predicting the timing of water breakthrough in edge water gas reservoirs by considering reservoir dip and water invasion.Petroleum Drilling Techniques,2017;45(1):91-96
13李涛,袁舟,陈伟,等.气藏水平井边水突破时间预测.断块油气田,2014;21(3):341-343Li Tao,Yuan Zhou,Chen Wei,et al.Prediction on water breakthrough time of horizontal well in gas reservoir with edge water.Fault-Block Oil&Gas Field,2014;21(3):341-343
2张烈辉,严谨,李允,等.考虑凝析油析出时的底水凝析气藏见水时间预测新方法.天然气工业,2004;24(7):74-75Zhang Liehui,Yan Jin,Li Yun,et al.New method to predict condensing effect on water breakthrough in condensate reservoirs with bottom water.Natural Gas Industry,2004;24(7):74-75
3王会强,李晓平,杨琪,等.底水气藏见水时间预测方法.新疆石油地质,2007;28(1):92-93Wang Huiqiang,Li Xiaoping,Yang Qi,et al.A prediction of water breakthrough time in gas reservoirs with bottom water.Xinjiang Petroleum Geology,2007;28(1):92-93
4赵新智,朱圣举.低渗透带隔板底水油藏油井见水时间预测.石油勘探与开发,2012;39(4):471-474Zhao Xinzhi,Zhu Shengju.Prediction of water breakthrough time for oil wells in low-permeability bottom water reservoirs with barrier.Petroleum Exploration and Development,2012;39(4):471-474
5黄全华,陆云,付云辉,等.考虑非达西效应的底水气藏见水时间预测方法.科学技术与工程,2016;16(14):137-139Huang Quanhua,Lu Yun,Fu Yunhui,et al.An approach to predict water breakthrough time of gas reservoirs with bottom water in consideration of non-Darcy flow.Science Technology and Engineering,2016;16(14):137-139
6 Sobocinski D P,Cornelius A J.A correlation for predicting water coning time.Journal of Petroleum Technology,1965;17(5):594-600
7 Kuo M C T.A simplified method for water coning predictions.SPEAnnual Technical Conference and Exhibition.San Francisco:Society of Petroleum Engineers,1983:1-14
8王会强,李晓平,吴锋,等.边水气藏气井见水时间预测方法.特种油气藏,2008;15(4):73-74Wang Huiqiang,Li Xiaoping,Wu Feng,et al.Prediction of water breakthrough time in gas reservoirs with edge water.Special Oil and Gas Reservoirs,2008;15(4):73-74
9吴克柳,李相方,张公涛,等.考虑反凝析的边水凝析气藏见水时间预测新方法.科学技术与工程,2011;11(19):4574-4577Wu Keliu,Li Xiangfang,Zhang Gongtao,et al.A novel approach to predict water breakthrough time in gas condensate reservoir with edge water considering retrograde condensation.Science Technology and Engineering,2011;11(19):4574-4577
10杨芙蓉,樊平天,贺静,等.边水气藏高产气井见水时间预测方法.科学技术与工程,2013;13(29):8745-8747Yang Furong,Fan Pingtian,He Jing,et al.An approach to predict water breakthrough time in high gas rate wells of gas reservoirs with edge water.Science Technology and Engineering,2013;13(29):8745-8747
11汪周华,王子敦,邓丹,等.考虑重力及气体非达西效应影响的边水气藏边水突破时间预测模型.石油钻采工艺,2016;38(2):210-215Wang Zhouhua,Wang Zidun,Deng Dan,et al.Model for prediction of edge-water breakthrough time in reservoirs with edge water with consideration to effects of gravity and non-Darcy effect of gases.Oil Drilling&Production Technology,2016;38(2):210-215
12李元生,杨志兴,藤赛男,等.考虑储层倾角和水侵的边水气藏见水时间预测研究.石油钻探技术,2017;45(1):91-96Li Yuansheng,Yang Zhixing,Teng Sainan,et al.A novel method for predicting the timing of water breakthrough in edge water gas reservoirs by considering reservoir dip and water invasion.Petroleum Drilling Techniques,2017;45(1):91-96
13李涛,袁舟,陈伟,等.气藏水平井边水突破时间预测.断块油气田,2014;21(3):341-343Li Tao,Yuan Zhou,Chen Wei,et al.Prediction on water breakthrough time of horizontal well in gas reservoir with edge water.Fault-Block Oil&Gas Field,2014;21(3):341-343