The Development Potential And Production Replacement Technique Of ES3 Reservoir Of Wa38 Block

During the study,the mathematics statistics,the numerical simulation, the physical analogue, the reservoir engineering calculation method etc are used. On Basis of all kinds of monitor data, splitting the production of the flow units, and studying the remaining oil. steam flooding test of S3 oil formation is successful. Through the contrast and optimization of various production replacement technique, the steam flooding will become the mainly production replacement method. Through the comprehensive research, the following mainly result are obtained:(1)The steam huff-n-puff has entered into the production tail, the following development scheme is urgently needed to seek.The seriously watered-out influenced the scale and diversity of replacing development scheme.(2)ES3 heavy oil reservoir grows three kinds of sedimentary facies,which are braided channel,interchannel and frontchannel.The restraining barrier between Ed3 and ES3 mainly distribute in the eastern region and western region where the steam flooding will be adopted to dig the remaining oil.(3) The test of steam-flooding is satisfied.(4)The best development scheme is steam-flooding in no watered-out zone of ES3Ⅰ+Ⅱ,and SAGD in ES3Ⅲreservoir.(5)Have allocated 12 well groups of steam-flooding in ES3Ⅰ+Ⅱoil formation,and 2 horizonal wells in the ES3Ⅲoil layer.The recoverable oil will be increased 56.3×104 t at last and ultimate recovery factor will be growed 14.8%.(6)The project will get a higher economic benefit with 13.2% of IRR and 9614×104yuan of NPV. Now the steam flooding pilot has showed a favorable response.(7)The steam-flooding development is feasible in watered-out region after dropping the pressure.