留17断块低渗透油藏高效开发配套技术研究

留17断块为留西油田主力油藏,属非常典型的多层低孔低渗透油藏.自1983年投入开发以来,由于井网不适应、井距大等原因,导致水井吸水能力差,油井见效状况差,油藏能量保持水平低,采油速度仅0.8%,采出程度3.94%,开采效果差.针对以上问题,油藏先后采用了裂缝综合研究、整体加密调整、注采系统调整、压裂及重复压裂、解除油层污染等调整措施,油藏开发效果明显改善,采油速度提高到1.92%.目前油藏标定采收率30.7%,油藏采出程度已达20.9%,实现了低渗透油藏的高效开发.为同类型油藏的合理开发提供借鉴.

Effectively development technology for low permeability reservoir in fault block Liu 17

Fault block Liu 17 is the main reservoir of Liuxi Oil Field, and is a typical reservoir with multilayer, low porosity and low permeability. The reservoir has poor production effect since 1983, such as low water injection capacity in injection wells, poor response in oil wells and ineffective maintenance of reservoir energy. The production rate is only 0. 8% while re-serve recovery is 3.94% because of the improper well pattern and large well spacing. To solve the problems above, some measures have been taken successively in the reservoir, such as synthesized fracture research, integrated infill adjustment, in-jection-production system adjustment, multiple fracturing, reservoir pollution relieving, etc. As a result, the reservoir devel-opment effect has obviously improved and production rate has increased to 1.92%. At present, calibrated recovery of the reser-voir is 30. 7% and recovery has reached 20.9%. Effectively development of low permeability reservoir has been realized and provides reference for the proper development of such kinds of reservoirs.