Optimization Of Horizontal Well Multi-stage Fracturing And Productivity Evaluate In X Tight Oil Reservoir

Horizontal well multi-stage fracturing is to realize the economic and efficient development of tight oil reservoir core technology.The completion has important significance in the improvement of production rate per well and the incensement of economic benefits.Based on the geological characteristics of reservoirs,this paper analyzes the factors influencing the completion of tight oil reservoirs by means of comprehensive geology,engineering requirements and domestic and foreign literatures.Based on the theory of fiuzzy mathematics,this paper studies the completion optimization and software development,Based on the method of volumetrie source method,the initial production capacity of different completion technology in evaluation period is evaluated according to the law of decreasing capacity of the research block.On the basis of considering the completion cost,using the technical and economic evaluation method to quantitatively evaluate the merits of these completion processes,thus determining the most suitable completion process.Mainly in the following aspects:(1)Optimization of well completion on the basis of fuzzy theory.On the basis of borehole wall stability analysis,on the basis of fuzzy theory,comprehensive multi-factor evaluation model is set up,forming a set of horizontal segmentation based on fuzzy mathematical analysis completion method optimization comprehensive evaluation method.(2)Deliverability evaluate based on Volumetric source model.The volumetric source model assumes that the source has a certain volume,removes the possibility of the existence of singularity,and also removes the assumption that the point source model does not consider the flow in the source,which improves the calculation efficiency and ensures the accuracy.A case calculation was carried out for a specific well.The results showed that the productivity evaluation results of the established volumetric source model were highly consistent with the actual productivity.(3)Production decline law analysis and dynamic data analysis.Single well production decline law was analyzed,and the production decline form was defined,and the basis and relevant decline parameters were provided for the optimal capacity evaluation of subsequent completion methods.The dynamic data analysis method was used to analyze the dynamic data of each single well in the target block,and the effective permeability and fracture semi-length in the reconstructed area were calculated to provide effective fracture parameters in line with the actual situation of each single well for the prediction of single well production model.(4)Comprehensive optimization of well completion.Forming a set of horizontal segmentation based on fuzzy mathematical analysis completion method optimization comprehensive evaluation method,at the same time,establish the economic evaluation model of horizontal well fracturing completion way for dense target oil characteristics,combined with the well productivity and economy analysis,the well completion method optimization of target block.(5)Optimization of multi-cluster perforation parameters in well cementing.Based on the principle of clustering and limiting current,several clusters of perforation are divided in each segment,and the number and diameter of holes are controlled in each perforation cluster to achieve the generation of fracture in horizontal Wells during fracturing.(6)Case analysis:a case calculation was carried out for a specific well.Segmental fracturing of perforation with pumping bridge plug was optimized.In combination with optimization of multi-cluster perforation parameters in well cementing,the productivity specific well is higher than that of adjacent wells.