西南石油大学学报(自然科学版) ›› 2001, Vol. 23 ›› Issue (6): 34-37.DOI: 10.3863/j.issn.1000-2634.2001.06.11

• 石油工程 • Previous Articles     Next Articles

A STUDY OF HORIZONTAL WELL PRODUCTIVITY IN RESERVOIRS WITH TOP AND BOTTOM DRAINAGE BOUNDARIES

GUO Xiao1 ZHAI Yu-yang2.   

  1. (Southwest Petroleum Inst, Nanchong Sichuan 637001,China)
  • Received:2001-03-26 Revised:1900-01-01 Online:2001-12-20 Published:2001-12-20

Abstract:

Conformal transformation is an effective method used to solve problems of 2D steady-state flow. By applying conformal transformation, horizontal well 3D flow is simplified into vertical radial and horizontal radial flows. A formula of horizontal well productivity for reservoirs with top and bottom drainage boundaries is derived. In addition, the effect of eccentricity and formation anisotropies on horizontal well productivity is analyzed. The results show that eccentricity has minor influence on horizontal well productivity: when δ/h is less than 3%, Qv/Qv0is no more than 5%. The influence of anisotropies on horizontal well productivity is related to the relative level of horizontal and vertical flow resistance forces: when horizontal resistance force is greater than vertical one, the productivity decreases with increased kv/kh; when horizontal resistance force is smaller than vertical one, the productivity increases with decreased kv/kh.

Key words: horizontal well, conformal transformation, drainage boundaries, productivity

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