Abstract
Because of the complex shape sand bodies of Sulige Gas Field, gas well controlled reserves is low, and reservoir pressure drop fast, it is very hard to accurately forecast gas well deliverability. Based on the study of characteristics of sand bodies, four superimposed sand models and a two-region seepage model are put forward. Using the material balance method of natural water drive gas reservoir and cumulative production methods to calculate dynamic reserve of near wellbore I and distant wellbore II and cumulative gas invaded volume from distant wellbore II. Boundary reservoir pressure was calculated by the iteration in different production periods, and the deliverability model was established based on gas deliverability equation of pseudo-stationary flow in gas well of complex shape sand bodies and small-scale reserve in Sulige Gas Field. The model considers not only distribution characteristics of reservoir pressure in different seepage modes, but also fast dropping of reservoir pressure. The application shows that the result is accurate, the mean error being below 10 % and the model can meet the requirement of the project.
Highlights
The calculation of gas well deliverability is the major part of gas reservoir development and management (Yin et al 2007)
Boundary reservoir pressure was calculated by the iteration in different production periods, and the deliverability model was established based on gas deliverability equation of pseudo-stationary flow in gas well of complex shape sand bodies and small-scale reserve in Sulige Gas Field
Based on the special mining model and field data, Li et al (2007) used regression method to put forward the empirical equation of gas well deliverability, which could only be used in early production period (Li et al 2007)
Summary
The calculation of gas well deliverability is the major part of gas reservoir development and management (Yin et al 2007). Abstract Because of the complex shape sand bodies of Sulige Gas Field, gas well controlled reserves is low, and reservoir pressure drop fast, it is very hard to accurately forecast gas well deliverability. Boundary reservoir pressure was calculated by the iteration in different production periods, and the deliverability model was established based on gas deliverability equation of pseudo-stationary flow in gas well of complex shape sand bodies and small-scale reserve in Sulige Gas Field.
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