Review of shale oil and gas recoverable estimation based on decline analysis
At present,there is a lack of comprehensive and in-depth understanding of the seepage characteristics of unconventional oil and gas reservoirs,and there are still considerable uncertainties in the analysis and prediction of production data of shale oil and gas wells.By analyzing the characteristics of the main links in the assessment of shale oil and gas recoverable capacity,the following conclusions are drawn:1)The flow stage diagnosis of shale oil and gas wells is very important,which can effectively reduce the risk of subsequent decline analysis to predict recoverable volume.The change of production state of shale oil and gas wells has a significant impact on recoverable production.2)Based on the typical production curve established on the basis of the production and recoverable capacity prediction of producing wells,the reasonable selection of sample wells and the statistical comparison of recoverable capacity directly affect the rationality of recoverable capacity of undeveloped blocks.3)Inter-well pressure channeling interference has a great impact on the recoverable capacity of old and new wells,so it is necessary to conduct in-depth research on the matching between well spacing and fracturing scale.Because fracture conductivity and effective permeability decrease with the decrease of pressure and inter-well interference,the combination of decline analysis and numerical simulation is an effective method to evaluate the recoverable capacity of shale oil and gas.
shale oil & gas wellsdevelopment phaserecoverabledecline analysisuncertainty
万方数据
维普
