非均质底水气藏水平井井筒流量及压力剖面研究

doi:10.3969/j.issn.1673-8926.2014.05.023

Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (5): 124-128.doi: 10.3969/j.issn.1673-8926.2014.05.023

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Study on the flow rate and pressure profile of horizontal well in heterogeneous gas reservoir with bottom water

YUAN Lin¹， LI X iaoping¹， ZHANG Lu²， LIU Bin¹， WANG Wenbin³

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University， Chengdu 610500， China； 2. CNOOC Energy Technology & Services Limited， Tianjin 300452， China； 3. Pilot Production Laboratory of Natural Gas Research Institute， Southwest Oil and Gas Field， Luzhou 610213， Sichuan， China

Online:2014-10-20 Published:2014-10-20

Abstract

Abstract:

During the developing the heterogeneous gas reservoir with bottom water, the distribution of different permeability along the wellbore
will be an important factor which influences the flow rate profile and pressure profile. Based on the theory of seepage flow of horizontal well in
heterogeneous gas reservoir with bottom water, this paper used infinitesimal method to divide the heterogeneous formation into several homogeneous formations, established the coupling model between formation and wellbore,which considered the variable mass flow in the wellbore, and established the semi-analytic model of flow rate profile and pressure profile of horizontal well in gas reservoir with bottom water.Case study shows that the flow rate profile presents different fluctuation as the changing distribution of permeability along the wellbore, the larger the value of K_h_max/K_h_minis, the larger the fluctuation range will be, meanwhile during drilling, if wellbore has drilled many high permeability formations, the production of horizontal well will be higher; near the toe and heel of horizontal well, the distribution of permeability has no influence on pressure profile, while in the middle of the wellbore, the larger the number of high permeability formation is, the greater the pressure drop in the wellbore will be and vice versa; the pressure drop along the total wellbore is very smaller,just 10^-4MPa, so during well testing, thepressure gage should only put at the heeling of the wellbore.

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YUAN Lin， LI Xiaoping， ZHANG Lu， LIU Bin， WANG Wenbin. Study on the flow rate and pressure profile of horizontal well in heterogeneous gas reservoir with bottom water[J].Lithologic Reservoirs, 2014, 26(5): 124-128.

References

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