大港滩海复杂断块凝析气藏开发方案研究

大港油田滩海地区断块较多，油藏类型复杂，其中张海5断块为受构造和岩性双重作用控制的带油环凝析气藏。针对这个断块的非均质性较强，平面纵向连通性较差等特点，采用数值模拟方法并结合油藏工程方法对断块凝析气基础性开发的合理井网井距、井型、水平井水平段长度进行了筛选；同时对枯竭式开采、循环注气、水驱等不同驱动方式进行了论证，对比出了最优的驱动方式。通过对先采油后采气、先采气后采油和油气同采的3种不同开采方式开发效果的对比，优选出了适合这2个凝析气藏的合理油气开采顺序。在各种机理研究及驱动方式和开发方式研究的基础上，对这个断块进行了各种预测方案的对比分析，优选出了能够高效高速开采滩海地区凝析气藏的技术方案及对策，并提出了开发建议。

Development Program for Complicated Fault-block Gas Condensate Reservoirs in Dagang Offshore Area

There are a lot of fault blocks and various kinds of reservoirs in the offshore area of Dagang Oilfield. Fault\|block Zhanghai 5 is an oil\|rim gas condensate reservoir controlled by both structure and lithology. Aiming at the serious heterogeneity and poor longitudinal connectivity in plane, numerical simulations combined with reservoir engineering methods are used to select the reasonable well pattern, well space, well types, and horizontal section length for horizontal wells. At the same time, the best drive type is chosen through comparing different drive types, such as depletion production, cyclic gas injecting, water flooding etc. Two reasonable oil and gas production orders suitable for the gas condensate reservoir are optimized by comparing the effects of oil production early and gas production later, gas production early and oil production later, oil and gas production at the same time. On the basis of different studies on mechanisms, drive types and development methods, various prediction programs for this fault block are compared and analyzed. As a result, the technology program and strategy are optimized for developing the gas condensate reservoir in the offshore area with high efficiency, and development suggestions are proposed as well. JP]