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
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