文13西油藏构建分类储层井网研究及应用

Research on setting up classified reservoir well pattern and its application in west Wen 13 reservoir

以深层高压低渗为特点的文13西油藏高含水后期井网不完善,二、三类层在弹性能量释放后得不到有效水驱动用,开发效果呈变差趋势。针对开发中存在的问题,通过基础地质研究,充分认识不同类型储层剩余油潜力及分布类型,通过室内实验和矿场试验,积极探索储层水驱开发效果及规律。在此基础上,依托集成配套工艺技术的攻关及应用,重新构建与开发特点相适应的分类储层注采井网。通过缩小井距、压缩层段,合理控制层间渗透率级差,建立了二、三类层有效的水驱体系,通过井点优化抽稀,拉大井距,进一步提高了一类层水驱波及效率。实践表明,通过针对性的措施调整,油藏水驱动用程度提高,生产形势好转,采收率提高。针对该油藏所进行的有益探索对同类油藏的开发具有一定的借鉴意义。

As far as the western Wen 13 reservoir is concerned, which is characterized by deep low permeability reservoir with high pressure, Class Ⅱ and Class Ⅲ reservoirs can not be effectively produced by waterflooding after natural energy release and therefore the development effect is getting worse because of the imperfect well pattern resulted fi＇om the factors such as great well spacing, rough reservoir classification and serious well condition damage at last high water cut stage. Aiming at the existent problems in the development, the potential and distribution of residual oil in different types of reservoirs are sufficiently recognized based on the basic geological research, and the waterflooding effect and regulation are also investigated through the laboratory experiment and fiehd experiment. The injection-production well pattern of classified reservoir fitting for development features are rebuilt up by the study and application of combined techniques. The effective waterflooding system of Class Ⅱ and Class Ⅲ reservoirs is set up by reducing well spacing and decreasing productive sections to make the interlayer permeability differences reasonable, and the waterflooding efficiency is enhanced for Class I reservoir by optimizing well spots and enlarging well spacing. The development practice indieates that the waterflooding producing degree of reservoir is improved with a good production condition and enhanced oil recovery, after corresponding and effective measure adjustments. The beneficial researc, h for the reservoir can give an active reference to the development of similar reservoirs.