Infilling Method of Well Pattern Suitable to Imbibition Oil Recovery for Fractured and Extralow-Permeability Oil Reservoirs in Daqing Oilfield

摘要

In view of the features of the remaining oil after a periodrnof production since secondary infilling adjustment of waterrnflooding development oil field, that is, low quality, unbalancedrnplanar distribution and high vertical dispersal, study on tertiaryrninfilling adjustment optimized well spacing has been carriedrnout . The study has solved the problems of reasonable wellrnspacing density, injector-producer distance, injectionproductionrnsystem, how to locate wells near old injector array,rnand how to adjust and integrate with the original well pattern,rnwith the tertiary recovery well pattern and with the injectionproductionrnsystem. The overall strategy and optimized wellrnspacing method for tertiary infilling adjustment have beenrnbrought forward consisting of reasonable well location regionrndivision →balanced well spacing →well by well scanningrn→local adjustment →step by step implementation. The studyrnhas a wide guidance for the tertiary infilling adjustment ofrnother blocks to find practical, feasible and effectivernapproaches.