大牛地气田压裂水平井合理动态配产优化研究
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摘要
大牛地气田压裂水平井现有配产方法存在定产降压期配产气量远高于临界携液气流量、定压降产期配产气量低于临界携液气流量等问题,导致气井在生产过程中出现产量和压力递减快或井筒积液、水淹,严重影响了产水气井生产效果。考虑水平井有限导流、多段压裂缝间干扰及水平段变质量流特征,建立了压裂水平井气水两相温度、压力和产能耦合预测模型,评价表明,模型预测水平井流入流出生产动态与实际较吻合。以此为基础提出压裂水平井合理动态配产,即下限值取临界携液气流量值,上限值取流入流出曲线法与无阻流量法得到的合理产气量最小值,并给出了DPS-5井合理配产范围为1.76×10~4m~3/d～2.56×10~4m~3/d,对现场生产具有一定指导意义。
The existing proration method of fractured horizontal wells in Daniudi gasfield had problems,such as proration in the period of fixed production and declined pressure exceeding critical liquid-carrying gas flow rate,which lead to production and pressure rapidly declining,and proration in the period of fixed pressure and declined production below critical liquid-carrying gas flow rate,which couldn't reach the liquid-carrying potential and affected production results seriously.Therefore,based on the characteristics of finite conductivity,interference among multiple fractures and variable mass flow in horizontal wells,a new predicted coupling model of fractured horizontal wells was proposed to study the performance of gas and water temperature,pressure and production.The computational program showed that the predicted result of the gas inflow and outflow performance was excellently consistent with the practical example.Based on the new method,the rational dynamic proration of fracturing horizontal wells in Daniudi gasfield are proposed,which the lower limiting value was proposed to take critical liquid-carrying gas flow rate,and the upper limit value to take minimum value from the gas inflow and outflow curve and open flow potential method.Also it gave out the proration range 1.76×10~4m~3/d～2.56×10~4m~3/d of DPS-5 well,which played a guiding role in the actual production.
The existing proration method of fractured horizontal wells in Daniudi gasfield had problems,such as proration in the period of fixed production and declined pressure exceeding critical liquid-carrying gas flow rate,which lead to production and pressure rapidly declining,and proration in the period of fixed pressure and declined production below critical liquid-carrying gas flow rate,which couldn't reach the liquid-carrying potential and affected production results seriously.Therefore,based on the characteristics of finite conductivity,interference among multiple fractures and variable mass flow in horizontal wells,a new predicted coupling model of fractured horizontal wells was proposed to study the performance of gas and water temperature,pressure and production.The computational program showed that the predicted result of the gas inflow and outflow performance was excellently consistent with the practical example.Based on the new method,the rational dynamic proration of fracturing horizontal wells in Daniudi gasfield are proposed,which the lower limiting value was proposed to take critical liquid-carrying gas flow rate,and the upper limit value to take minimum value from the gas inflow and outflow curve and open flow potential method.Also it gave out the proration range 1.76×10~4m~3/d～2.56×10~4m~3/d of DPS-5 well,which played a guiding role in the actual production.
引文
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[15]周瑞立,周舰,罗懿,等.低渗产水气藏携液模型研究与应用[J].岩性油气藏,2013,25(4):123-128.
[2]Jemert T A,H Selseng.Permeability function describes core permeability in stress-sensitive rocks[J].Oil&Gas Journal,1998,(12):60-63.
[3]补成中,邓团,李洪玺,等.苏里格气田压裂井合理配产研究[J].天然气勘探与开发,2009,32(4):37-39.
[4]Hegre Mukherjee.A Parametric Comparison of Hori-zontal and Vertical Well Performance[J].SPE 1892,1991.
[5]GUO B.A Simple and Rigorous IPR Equation for Vertical and Horizontal Wells Intersecting Long Fractures[J].JCPT,1999,38(7).
[6]郎兆新,张丽华,程林松.压裂水平井产能研究[J].石油大学学报:自然科学版,1994,18(2):43-46.
[7]Hujun Li.A New Method to Predict Performance of Fractured Horizontal Wells[J].SPE 37051,1996.
[8]Eveas R.D.Production forecasting and Economia Evaluation of Horizontal Wells Completed in Naturally Fractured Reservoirs[J].JCPT,1998,37(6).
[9]程林松,郎兆新,等.分支水平井产能的研究[J].石油学报,1995,16(2):95-98.
[10]Hagedorn A R,Brown K E. Experimental Study of Pressure Gradients Occurring during Continuous Two-phase Flow in Small-diameter Vertical Conduits[J].JPT,1965,(4):475-484.
[11]Beggs H D,Brill J P.A Study of Two Phase Flow in Inclined Pipes[J].JPT,1973.
[12]李颖川,等.采油工程(第二版)[M].北京:石油工业出版社,2009.
[13]周舰,罗懿,李颖川,等.大牛地水平井临界携液气流量计算模型[J].重庆科技学院学报(自然科学版),2013,15(2):67-71.
[14]周舰,王志彬,罗懿,等.高气液比气井临界携液气流量计算新模型[J].断块油气田,2013,20(6):775-778+796.
[15]周瑞立,周舰,罗懿,等.低渗产水气藏携液模型研究与应用[J].岩性油气藏,2013,25(4):123-128.