Effect of Well Trajectory on Production of Horizontal Well
Received date: 2011-05-12
Revised date: 2011-07-15
Online published: 2011-10-10
Drilled horizontal well is not absolutely horizontal,the well trajectory is undulant as wave shape.When the bending degree of wellbore is big,the conventional calculation formulas for horizontal well production would cause great error.It is necessary to further analyze the deliverability characteristics of horizontal well.In this paper,the horizontal well with curved trajectory is approximately regarded as a continuous structure which composed of a series of slant wells.We add two modifying factors of slanted pseudo-skin coefficient and partial penetrated pseudo-skin factor,and set up the slant well production formula for anisotropic reservoir.The production calculated by the slant well production formula is compared with the Joshi′s horizontal well production formula.We also discuss the effect of curved trajectory on horizontal well production.The results show that the curved trajectory can overcome the low vertical permeability and ensure the high production for horizontal well when the anisotropy is strong.The horizontal well production increases with increase of slant angle of curved section.When the reservoir anisotropy is weak,the curved trajectory will reduce the horizontal well production.
Key words: Well trajectory; Horizontal well; Production; Optimization design.
WANG Da-Wei, LI Xiao-Ping . Effect of Well Trajectory on Production of Horizontal Well[J]. Natural Gas Geoscience, 2011 , 22(5) : 926 -930 . DOI: 10.11764/j.issn.1672-1926.2011.05.926
[1]Kamkom R.Modeling Performance of Horizontal,Undulating,and Multilateral Wells[D].Texas:Texas A & M University,2007.
[2]Qi Zhilin,Du Zhimin,Tang Yong,et al.Steady state productivity model of snaky wells[J].Petroleum Exploration and Development,2006,33(1):87-90.[戚志林,杜志敏,汤勇,等.蛇曲井稳态产能计算模型[J].石油勘探与开发,2006,33(1):87-90.]
[3]Kamkom R,Zhu D,Bond A.Predicting Undulating-well Performance[R].SPE 109761,2009.
[4]Rogers E J,Economides M J.The Skin Due to Slant of Deviated Wells in Permeability-Anisotropic Reservoirs[R].SPE 37068,1996.
[5]Zhang Zhenhua,Yan Jienian.Study of formation damage effect on the productivity for directional wells[J].Oil Drill & Production Technology,2001,23(6):40-42.[张振华,鄢捷年.储层损害对大斜度定向井产能影响的计算方法研究[J].石油钻采工艺,2001,23(6):40-42.]
[6]Cinco H,Miller F G,Ramey H J.Unsteady-State Pressure Distribution Created by A Directionally Drilled Well[R].SPE 5131,1975.
[7]Besson J,Aquitaine Elf.Performance of Slanted and Horizontal Wells on an Anisotropic Medium[R].SPE 20965,1990.
[8]Brons F,Marting V E.The Effect of Restricted Fluid Entry on Well Productivity[R].SPE 1322,1961.
[9]Streltsova-Adams T D.Pressure Drawdown in a Well with Limited Flow Entry[R].SPE 7486,1979.
[10]Odeh A S.An Equation for Calculating Skin Factor Due to Restricted Entry[R].SPE 8879,1980.
[11]Papatzacos P.Approximate Partial-penetration Pseudoskin for Infinite-conductivity Wells[R].SPE 13956,1987.
[12]Chen Yuanqian.Comparison and transformation between two unit systems and their application[J].China Offshore Oil and Gas,2010,22(4):243-245.[陈元千.两种单位制的对比、变换与应用[J].中国海上油气,2010,22(4):243-245.]
[13]
[JP2]Fan Zifei,Fang Hongchang,Yu Guofan.A study on design method of optimal horizontal wellbore length[J].Acta Petrolei Sinica,1997,18(1):55-62.[范子菲,方宏长,俞国凡.水平井水平段最优长度设计方法研究[J].石油学报,1997,18(1):55-62.]
[14]Zhang Jing,Hu Yongle,Ran Qiquan,et al.Comprehensive research on the productivity and pressure loss of horizontal well in gas reservoir[J].Natural Gas Geoscience,2010,21(1):157-162.[张晶,胡永乐,冉启全,等.气藏水平井产能及水平段压力损失综合研究[J].天然气地球科学,2010,21(1):157-162.]
[15]Ding Yiping,Li Jianglong,Liu Chuanxi,et al.Optimized horizontal technology in low permeability and heavy oil reservoirs[J].Natural Gas Geoscience,2011,22(3):561-565.[丁一萍,李江龙,刘传喜,等.低渗透稠油油藏水平井优化设计研究[J].天然气地球科学,2011,22(3):561-565.]
[16]Wang Dawei,Li Xiaoping.Optimization principles for horizontal wellbore length[J].Xingjiang Petroleum Gology,2011,32(2):163-166.[王大为,李晓平.水平井水平段长度优化原则[J].新疆石油地质,2011,32(2):163-166.]
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