High-efficiency development technology for interbedded shale oil in terrestrial lake basin of national demonstration project
One typical inland depression freshwater lake basin shale oil was generated in stratum Chang 7 in Ordos Basin,with huge resource potential.Along with the development,the reservoir enters the stage of stable yields.While the supporting technical policies and management tools for stable production of the reservoir are relatively absent,resulting in dissatisfied production.In view of the disadvantage such as few management personnel in Qingcheng oilfield,through digitalization construction,such functions as on-line data recording,pipeline leakage monitoring,on-line monitoring of equipment operation and alarming of abnormal working conditions have realized,and the intelligent management mode for shale oil has been shaped.In response to the characteristics of dense reservoir,strong heterogeneity and development difficulty in Chang 7 reservoir,the application of technologies including carbon dioxide pre-fracturing and precise staged acidizing,as well as the implementation of policies such as single-well,platform and reservoir differentiated management,have promoted the integration of geological engineering and reservoir differentiated management.Aiming at the characteristics of high output and large gas volume of single wells of Chang7 shale oil,the company innovates the mode of station deployment on large platforms,and explores the ground construction mode for shale oil from large platforms to joint stations by means of skid-mounting,integration and digital intelligence,to achieve the purpose such as comprehensive utilization of oil,gas and water,resource sharing of the whole system,efficient integration of multi functions and intelligent control of the whole process.After the promotion and application of the above technologies,the production parameters of Chang 7 shale oil in Qingcheng oilfield have gradually been improved.The natural decline of shale oil horizontal wells drops to 15.9%from 16.6%.The formation deliverability is sufficient,with stable flow-to-saturation ratio(1.0～1.2).In addition,the individual well production rate has achieved a significant increase compared to 2022 and the complete cost has been reduced to USD 51.33 $/bbl,which has realized economies of scale development.The key technologies for efficient development based on exploration and research have boosted the economic production of Qingcheng shale oil,and also play leading role in economic development of land facies shale oil in China.
interbedded shale oilunconventional oil and gasexploration and developmentengineering technologydigital transformationgeoengineering integrationreservoir modificationstandardised platforms
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