| At present,the daqing oil field,in the period of 40 million tons of "stable" key "to fill gas oil,natural gas rapid production" is one of the most effective way to oilfield stable yield.But the glutenite 26.4 billion reserves(begin submit reserves)in 1998,has been due to the low single-well production,stable ability difference can’t use.Shahe sub compact glutenite resource in more than 260 billion,is the main target zone 3 100 billion.Has the exploration for more than 10 years,has been no breakthrough.Factors of dense glutenite reservoir development difficulty is mainly: one is buried depth,density of low permeability glutenite reservoir,reservoir lateral variation is fast,accurate dessert area is difficult find glutenite reservoir,gas well production is low,stable yield,poor ability of conventional horizontal well fracturing reserve range is limited,there is no development effective way to increase production capacity;The second is camp four glutenite reservoir vertical well and horizontal well pressure increase after the effect is not ideal,is gravel block shattered jams seam,fracturing construction difficulties,difficult problem to effectively transform reservoir.So in order to further improve the degree of dense deep glutenite of daqing oil field using whole,expand this kind of reservoir exploitation degree,improve the development effect,increase production,reduce costs,the need for suitable for low permeability reservoir fracturing of branch horizontal well completion technology research to increase production.The main research idea is first according to reservoir characteristics,through the evaluation of favorable choice blocks,deploy branch horizontal Wells,the formation of safe and effective,the production cycle longer well completion string and well control reserves increase.Second is according to the practical drilling in rock formations and completion situation,developing period of hierarchical scale fracturing process test.Through the research,has formed a "phased" effective reservoir prediction technology,drilling tool optimization combination,completion tools reentrant and sealing,completion and fracturing techniques,double branch well fracturing optimization design method,drilling and well completion,volume key technology such as fracturing integrated operation mode.After completion of the experiment,formation of the branch horizontal well stimulation can be preliminary meet the needs of the low permeability reservoir development effectively. |
