复杂断块油藏构造破碎,难以形成规则井网,精细的分类型注气(CO2)模式是提升开发效果的关键。以J油田为例,依据现有井网、断块形态及开发方式划分典型类型,优化其注气模式以形成复杂断块油藏分类注气方式选择模板。研究表明,水驱开发窄条带油藏适宜采用底(边)部气水交替方式,而弹性能量开发窄条带则应采用顶部排状注气以发挥重力辅助驱油作用。面积井网油藏则应在原井网条件下实施注气或气水交替开发。对极复杂断块类型,提出“异步吞吐”注气模式,可有效提升其开发效果。该分类注气模式有效指导了J油田注CO2技术应用,获得了良好增油效果,可为其它同类型油藏的注气开发提供借鉴。

Complex fault block reservoirs have broken geological structure and difficulty in forming regular well pattern.Therefore, a gas injection (CO2) model with more precise classification is the key to improve the gas injection effect.Taking oilfield J as an example, this paper divides the typical types of complex fault block according to the existing well pattern, fault block shape and development mode, andthen optimizes the corresponding gas injection method of different reservoir to form the selection template of classified gas injection mode of complex fault block reservoir.The results show that the bottom (edge) gas-water alternations are suitable for the development of narrow-banded reservoir by water flooding,while the top row gas injection should be used for the development of narrow-banded reservoir by natural energy flooding to increase the effect of gravity-assisteddrainage.The areal well pattern reservoir should be developed alternately by gas injection or gas-water injection under the original well pattern.For extremely complex blocks, the gas injection mode of "asynchronous huff and puff" is proposed to effectively improve the development effect.With good oil enhancement and economic benefits, the classified gas injection mode effectively guides the field application of CO2injection technology in oilfield J, and verifies the effectiveness of the classified gas injection mode, which provides basis for decision-making and reference for the gas injection development of other complex fault block reservoirs.