New Interpretation Methods Of Well Testing And Their Applications In Nanpu Sag

Since the first DST test of this block in 1980s k,after nearly thirty years of development,well testing technology has become an important part of supporting technology in oil and gas exploration and development in this block.But the traditional well test interpretation method is difficult to meet some difficulties such as calculating parameters of the low permeability reservoir and so on.The precision and accuracy of the interpretation results can not be guaranteed,and the application scheme based on well testing technology can not be formed.In order to solve the problem that the traditional method can not solve,this paper uses the method of small signal extraction to solve the problem that the low permeability reservoir can not solve the formation parameters,uses deconvolution method to correct the error caused by incorrect stacking,uses variable input method to correct the error caused by plug flow.With the above methods,this paper makes a review on the well testing data of clastic rock reservoir in this block and improves the precision and accuracy of interpretation results.Based on the above review,this paper summarizes four types of different types of clastic rock reservoir in this block:medium-high permeability reservoir,low permeability reservoir,extremely low permeability reservoir and pressure attenuation reservoir,and describes the characteristics of each of the four types of reservoir.In this paper,the number and distribution of four types of reservoirs in this block,and the skin factor of the four reservoirs are analyzed.And then the effects of formation modification of the four types of reservoir are analyzed.According to the results of the classification and statistics,this paper put forward the selection criteria based on well testing data for formation modification,and the application of this criteria in the block,illustrated the feasibility of the criteria.At last,this paper put forward the plan based on well testing technology to predict and evaluate effects of the formation of the block,and gave examples of the application of the scheme in Nanpu sag.