Research On High-efficiency Development Technologies Of Chang 7 Shale Oil Of Block A In Ordos Basin

Major breakthroughs have been made in conventional oil and gas exploration and shale oil and gas exploration in the Ordos Basin,especially tight oil and gas and shale oil and gas have huge resource potential.Current research hotspot and focus is how to use advanced technology and reliable mining plan to utilize these resources efficiently.This article takes Chang7 shale oil of Block A of the Ordos Basin as the research object,and explores efficient development methods for shale oil in response to its low oil recovery rate,low single well productivity,and low recovery rate.Testing methods such as casting thin sections and scanning electron microscopy has been used to study reservoir characteristics,like petrological characteristics,reservoir characteristics,fracture characteristics,fluid properties,physical properties and seepage characteristics.Using the method of experiment,production data analysis and numerical simulation,the development methods of water injection,water flood stimulation,air foam flooding,CO₂flooding,serial energy replenishment fracturing and infill horizontal wells were evaluated and optimized,and the reservoir reconstruction parameters were optimized.And then draw the following conclusions.Low porosity,low permeability,compactness and brittleness are the characteristics of Chang 7 shale oil in Area A,determineting its development approach.The artificial fracture percolation system is produced by fracturing reform,which can increase movable oil and fracture control reserves.There is serious degassing,insufficient energy phenomenon and complex fracture systems in the developed area,causing the poor adaptability of water and gas flooding.So the main means of increasing oil production of the developed area is developing infill horizontal wells in areas rich in remaining oil and well spacing.The main production increasing directions of undeveloped area are as follows.Arrange reasonable well pattern in geological sweet spot in order to promote single well control reserves.Optimize fracturing parameters to create more complex fracture systems.In this way,the volume of fracture seepage can be increased.Set reasonable shut-in time after fracturing and add appropriate amount of oil displacement agent to improve imbibition diffusion effect.Controlling reasonable flowing pressure and production parameters can reduce formation degassing and prolong the driving time of matrix elastic drive.