Evaluation Of Xiashihezi Ⅲ Gas Reservoir Deliverability In Daniudi Gas Field

Evaluation of gas well at home and abroad reasonable deliverability is the main production well deliverability testing.The analysis of gas well deliverability wells are absolute open flow.When fratured gas well in low permeability ags reservoir is tested by conventional productivity test,the formation pressure is commonly not in pseudo-steady state.With short test time,the measured flow rate is great,the bottom-hole flowing pressure is high,the absolute open flow is little larger than practical and other characteristics.This paper discusses the advantages and disadvantages of analysis of the conventional method of gas well deliverability; Daniudi gas well field have industrial deliverability after fracturing;For the evaluation of gas well deliverability capacity after fracturing, the paper selected modified isochronal test and single point test.With analysis the characteristics of XiashiheziⅢgas reservois such as the structure of reservoir, physical property, reservoir heterogeneity and so on,we have a comprehensive awareness to the characteristics of XiashiheziⅢgas reservois; On the basis of dynamic analysis of single well in single gas well of H3 reservoir,the paper does classification of gas deliverability according to the size of gas deliverability: high capacity well(daily output>2×10~4m~3/d) middle capacity well (1×10~4m~3/d<daily output<2×10~4m~3/d),low producing well(daily output<1×10~4m~3/d). To analysis of the characteristics of the various stages of production,the paper finish the indication such as gas productivity index, production proration ratio,unit falloff of gas production and so on.Factors affecting the production capacity can be roughly divided into the engineering factors and geological factors: the geological factors such as median value radius, sedimentary facies and so on; the engineering factors such as producing energy, fracture, producing pressure drop and so on. From the production curve of XiashiheziⅢgas reservoir,the paper realize the characteristics of high capacity well such as slowly pressure declining,more stable gas production,low water producition;In the production process high capacity well can carry the liquid from the bottom hole. Middle capacity well is widely distributed,the absolute open flow is higher and in general 5-8×10~4m~3/d,such gas well is stable in the production process,but in the individual the time tubing casing pressure difference is larger,that maybe be caused by liquid of the bottom hole.Through the drainage measures such as bubble drainage,the gas well can take normal production.Low producing well is widely distributed, the absolute open flow is in general 1-4×10~4m~3/d, an average of the absolute open flow is 3×10~4m~3/d. Low producing well has poor capacity of liquid carrying,and it need to take strong drainage measures.Unit falloff of gas production of high capacity well is greater than the middle producing well and low producing well, the casing pressure of low producing well down fastest. The production proration of high capacity well is 1/9, it is reasonable; Production proration of middle capacity well is 1/6; Production proration of low producing well is 1/4-1/7,and the production is relatively high, drop of pressure is stable and the production proration is reasonable.The results of this research have the guiding significance to the achievement of sustained stableing of the gas reservior, and to improve the development technologies level of the gas reservoir.