Study of Effect Factors of Distribution of Remaining Gas in Daniudi HE Ⅲ Gas Reservoir
|School||Chengdu University of Technology|
|Course||Oil and gas field development geology|
|Keywords||HE III gas reservoir Remaining gas distribution Effect factors Reservoir heterogeneity|
Based on the study of structural features and microfacies of Daniudi HE III gas reservoir, through the research on reservoir heterogeneity and reservoir features then combine with the study of production features. We summarize finally the effect factors of distribution of remaining gas.Low porosity and permeability reservoir developed in Daniudi gas field. Single gas well has low production capacity. So it has great difficulty in stabling production. At present we have non- system study on distribution of remaining gas in Daniudi gas field. Taking into account current issues .Our study include: study of structural features, microfacies analysis, reservoir heterogeneity and reservoir features, distribution of remaining gas, effect factors of distribution of remaining gas.Through systematic research has analyzed: Daniudi HE III gas reservoir stream facies have been further broken down into four main microfacies types: beach heart, bed residence, splay, diffuse deposition of river. Between of the gas wells on beach heart and bed residence is the main local of distribution of remaining gas. The gas wells on the sand have well reservoir properties. Natural gas outflows easily. Single well has relatively high production capacity, when the wells have big control reserves; the local between the wells has much remaining gas. Layer Mezzanine changes the way of gas migration, meanwhile their frequency distribution and density distribution impact the law of gas and water flow. So it has great effect on developing wells and affects the distribution of remaining gas further. Because of gas reservoir has much gas layers in vertical, when we develop many gas layers in one well, because of layer heterogeneity and different pressure between the layers, make the non-main production layer has remaining gas. More well density and production time, less distribution of remaining gas. So there has much remaining gas in low well density local. Short production time wells have mucht remaining gas.