低渗水驱油藏水平井见水后产能研究新方法

doi:10.3969/j.issn.1673-8926.2015.03.020

Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (3): 127-132.doi: 10.3969/j.issn.1673-8926.2015.03.020

New method for productivity study of horizontal well after water breakthrough in low permeability water flooding reservoir

YUAN Lin¹,LIXiaoping¹,LI Songcen²

1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ， Southwest Petroleum University ， Chengdu 610500 ， China ；
2. Gas Production Plant ， Puguang Branch ， Zhongyuan Oilfield Company ， Sinopec ， Dazhou 636155 ， Sichuan ， China

Online:2015-05-26 Published:2015-05-26

Abstract

Abstract:

During the development of low permeability water flooding reservoir with horizontal well, water breakthrough is an important factor to restrict the production. Based on the Joshi theory of productivity of horizontal well, this paper simplified 3D flow of horizontal well into two 2D flows; considering the startup pressure gradient, used conformal mapping method to obtain productivity formulas in two 2D flow planes respectively; combined with the flow characteristics of oil-water two phase during non-piston-like displacement in water flooding reservoir, eventually obtained a new production formula of horizontal well in low-permeability water flooding reservoir. Through case study and comparison, the results calculated by new formula and single-phase productivity formula of horizontal well are more than the actual output, but the result calculated by new formula has a small relative error with actual output, only of 2.94%. It demonstrates that the new formula has a high degree of accuracy and is very practical. The study will provide a new method for predicting the production after water breakthrough of horizontal well in low permeability water flooding reservoir.

Key words: low permeability reservoir, developing with water flooding, horizontal well, oil-water two phase, productivity of oil well

YUAN Lin, LIXiaoping, LI Songcen . New method for productivity study of horizontal well after water breakthrough in low permeability water flooding reservoir[J].Lithologic Reservoirs, 2015, 27(3): 127-132.

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