Research And Application Of Heavy Oil Hard-to-recovery Reserve Layer Division Development Technology Of Lengjiabu Oilfield

hard-to-recovery reserves in Liaohe Oilfield are in a large scale at present.Assessment on hard-to-recovery reserves is becoming more and more important for increasingly difficult productivity construction and continuous stable production of Liaohe Oilfield.It is significant to resolve hard-to-recovery difficulties,break through development bottlenecks of hard-to-recovery reserves,improve crude output,and achieve rational and effective utilization of hard-to-recovery reserves for stable production of Liaohe Oilfield.This topic deeply analyzes blocks of typical hard-to-recovery reserves in Lengjiabao oilfield and formulates detailed and effective technical countermeasures based on influence factors of hard-to-recovery reserves with different characteristics,to perform overall deployment and division development technology research and application.Depression block 83 is in a complex structure and has poor seismic data.Tectonic characteristics of this block can be meticulously described through seismic data volume preferential selection and seismic data full 3-D trace;effective reservoir strata are not clearly known.Therefore,"Four Natures" of a reservoir stratum is reestablished,effective thickness standards are set up,and favorable individual reservoirs are preferentially selected;to resolve problems of thin block reservoirs and big development difficulties,horizontal well is used to perform overall deployment and division development based on detailed tracking of favorable individual reservoirs;a reservoir stratum with fine lithology can easily produce sand.A grabble packed sand control technology is preferentially selected to assist in development of hard-to-recovery reserves.In cold block 1,to resolve problems of a complex structure and a deep buried reservoir,well-log and seismic data is used to implement block structure and individual reservoir tracking;since the overall block producing degree is low,a fine-layered capacity implementation policy is used;to resolve problems of a large target-stratum oil quality difference and a poor vertical well development effect,horizontal well is used to perform division development in different modes.Based on comprehensive research and field implementation,effective use of hard-to-recovery reserves is realized and a number of research results are obtained.(1)For hard-to-recovery reserves with different characteristics,a development breakthrough can be realized though overall deployment of horizontal well and division development using different research techniques.(2)Implement a "four natures" relationship finely,reestablish oil reservoir new standards,and develop fine research on favorable individual reservoirs,economically and effectively using hard-to-recovery reserves.(3)Well-log and seismic combination is used to effectively carry out complex structure,accurately track favorable individual reservoirs,and lay a solid foundation for division development of hard-to-recovery reserves.(4)Layered fine capacity implementation and assessment on individual reservoir development potential help assist in favorable individual reservoir selection and provide basis for division development.(5)A grabble packed sand control technology is used to effectively perform sand prevention,provides new ideas and directions for sand prevention in similar reservoirs,and provides technological support for thin-layer heavy oil reservoirs.This topic studies and uses a division development technology in hard-to-recovery reserves,realizes development breakthrough of hard-to-recovery reserves,improves block crude output,has great significance to stable production of Lengjiabao oilfield,and guides effective development of similar reserves in Liaohe Oilfield.