Study On Evaluation Method Of Tight Oil EUR Calibration Well

Tight reservoir is a very important and potential unconventional oil and gas resource,but because of its complex reservoir formation mechanism,high content of interstitial materials,low porosity and low permeability,the production increase effect of tight reservoir is limited and the evaluation model is not perfect.In view of the above problems,the method to determine the standard of tight reservoir EUR calibration well is established,and on this basis,the life cycle evaluation method of tight reservoir EUR calibration well is studied.Based on the comprehensive analysis of geological factors,production time and production system,the production data of tight oil wells are screened.Combined with the characteristics of well test curve,the method of selecting EUR scale wells in tight reservoir is formed.By using this method,the production performance of 80 wells is evaluated.The results show that 6 wells meet the EUR scale well standard.By describing the properties of underground reservoir,the main factors of production capacity are analyzed By using well test evaluation and other means,the characteristics of EUR scale wells in tight reservoir are analyzed,and the main control factor analysis method affecting production is formed.The application results of 40 wells show that permeability and fracture number are the main factors,and the higher permeability and fracture number,the higher productivity.The results show that it is very difficult to judge the end time of the control boundary flow by using the production dynamic analysis method,determine the method of using the seepage theory to divide the life cycle,and establish the corresponding production prediction model to analyze the factors affecting the production capacity.The application results of 30 wells show that 6 wells have been out Now there are three life cycles,the remaining 24 wells are in the second life cycle;the average elastic recovery rate is 2.1%,and the recovery rate is low,the main reason is that the formation energy supply is weak,so the formation energy needs to be supplemented.