Optimization Of Thermal Recovery Technology After Waterflooding To Ordinary Heavy Oil Reservoirs

Ordinary heavy oil is mainly refers to the viscosity of50-10000, relative density greaterthan0.92crude oil. For most of the water drive development of heavy oil reservoirs, theultimate recovery of water flooding heavy oil is low. Therefore it is necessary to make athorough discussion about the necessity and feasibility of thermal recovery after waterflooding. On the basis of the actual reservoir parameters, using numerical simulation method,we study water drive turns to thermal development influence recovery, reservoirfactors,development factors and well trajectory factors. We obtained ordinary heavy oilreservoirs in four development mode recovery prediction formula.Economic indicators is the important basis for reservoir development, combined with thedynamic economic evaluation method and numerical reservoir simulation we put forward thethermal development economic limit evaluation method of heavy oil reservoir water, make amore practical layouts, this paper concluded the relationship of different reservoir static anddevelopment limit and oil prices, and then we can consult reservoir effective thickness limit,crude oil viscosity limit, reservoir permeability limit, initial oil saturation line, thermalrecovery time limit, injection temperature limit, steam dryness limit layouts, combing with theoil prices, we can concluded the economic development index of different water drive turns tothermal development way of heavy oil reservoirs.In the later period of the development of heavy oil reservoir water drive the effect is poor,combing with numerical simulation and reservoir engineering, we can find out the remainingoil distribution law and problems of well pattern optimization methods of later Water drivereservoir turns to thermal recovery. Improve the thermal effect in comprehensiveconsideration of the development.In heavy oil reservoir water drive turns to thermal development, joining the applicationof horizontal wells can improve the development effect and the oil well production comparedwith pure vertical well development. We use five point well network as basic pattern,combined with horizontal wells and vertical wells, researching for the numerical simulation ofheavy oil reservoir water drive turns to thermal combination pattern shape, determining thewell spacing of water flooding turns to thermal under horizontal+vertical development wayand choosing the most reasonable well pattern under numerous combination pattern schemes, providing theoretical basis for water drive turns to thermal combination hole pattern.