Research On The Optimization On Expansion Of Steam Flooding Test Well And Injection Production Parameters In Jin 91 Block

At present,steam flooding is the main way of heavy oil reservoir development;its core is to improve the injection production reservoir temperature field between wells.With the deepening of steam flooding,the leading edge of the liquid spread gradually expanded the scope,cross well group hot fluid flow due to the different environments can easily occur resulting in uneven onrush occur steam channeling phenomenon.In order to prevent this kind of steam channeling phenomenon occurring among wells,production wells are generally used to reduce the emissions,improve dynamic liquid level and other technical measures.Although these measures may play a role in mitigation,but its drawback is that it will cause the injected steam to exceed the production wells,and spillover to neighboring groups or test blocks,resulting in the dysfunctional relationship of injection and production,steam heat waste and the spillover of crude oil reserves.Based on the above issues and original development well network,we purpose a new location of wells,to make full use of the steam which spillovers to neighboring wells group or test block steam in the process of injection,and improve economic efficiency.The dissertation is based on the background of Liaohe Oilfield,the heavy oil development of block Jin 91.In June 2008,in group I of the northwest fault block of Jin 91,we launched a steam flooding pilot test,which undergoing 3 months of thermal communication stage.In September 2008,the production wells inside the test area gradually had efficiency and then reached its peak.In order to expand the geographic scope of steam in high production test wells,we make use of anti-nine wells and high intensity of steam injection for four years,resulting in the case of steam energy spillovering in some of the well groups.In June 2012,the test blocks entered into the late of steam drive in the development stage to reduce the injection of steam,but the steam spill energy area expanded and the scope has reached 167 m.The above descriptions of the problem indicates that,for the well pattern of anti-nine in the test areas,the production-injection ratio is lower,steam channeling is serious,and the oil and gas ratio is less than the limit of economic development,so it is thought that there is a big problem in pilot test block in the late period of steam development.We need to change the development mode,and usie reasonable well arrangement in the upcoming expansion test area of the development to extend the production time of block.In connection with the problems of anti-nine well pattern in pilot test areas,such as energy spillover,steam channeling and other issues,this paper takes advantage of Petrel geological modeling software make to fine geological modeling for Jin 91 block,and uses heavy CMG simulation software for production history matching.For the problems of test block,based on the innovations of anti-nine well pattern,we proposed the adjustment well pattern of anti-nine vacuate,small and large back-shaped.Using numerical simulation software for the choose and contrast of well pattern of anti-nine,anti-nine vacuate,small and large back-shaped well groups,we obtained the results that,for the small back-shaped well group,it can appropriately reduce the oil production rate adjusting by the inside and outside wells,and it also has a higher production-injection ratio,and can control the direction and speed of vapor diffusion.It is thought to be more in line with the expansion of the production requirements of steam flooding.Using innovative steam flooding methods of physical simulation experiment,we optimized and validated the parameters of production and development,and eventually obtained that,for small back-shaped well pattern,and inside wells by intermittently switching,it has a high recovery and can improve the utilization of the steam,and has a high degree of recovery and lower production rate.The achievements of this thesis can solve the steam spillover problems oil field gas injection in the process of steam injection,and provide the technical basis and theoretical support for the application of successful expanded of test areas by steam flooding and the promotion of innovative well patterns...