渤南油田义941块低渗透油藏高效开发技术

Highly efficient development technology of low permeability reservoir in Yi941 block of Bonan oilfield

渤南油田义941块油藏物性差,非均质性强,开发难度比较大。在总结渤南低渗透油田开发经验的基础上,针对身油藏特点采取了小井距、一套井网逐层上返、早期注水等开发技术;对开发过程中暴露出的油层污染、受效油井含水上升快等问题进行深入研究,实施了水力压裂、复合酸酸化、大炮弹重复补孔和不稳定注水等技术措施,充分发挥了油藏的生产潜能,获得了较好的控水稳油效果,实现了义941块高速高效开发。

Reservoir in Yi491 block in Bonan oilfield has poor poroperm characteristics and strong heterogeneity, thus development is very difficult. Based on experiences a-chieved in development of Bonan low permeability oilfield and in view of reservoir characteristics, several development technologies are applied, such as small well spacing,putting pay zones into production layer - by - layer upward and early water injection. Reservoir damage and rapid increase of water cut in response oil wells are thoroughly studied. Hydraulic fracturing, acidization with composite acid, repeat reperforating and unsteady water injection are carried out to tap the production potential of reservoirs. Water cut is effectively controlled and oil production is effectively stabilized, realizing highly effective development of Yi 941 block.