深层低渗透油藏大幅提高水驱采收率开发实践

Development Practice of Improving Water-Flooding Recovery in Deep Low Permeability Reservoir

王场油田潜43油组是江汉盆地潜江组含油面积与地质储量最大的一个低渗透油藏,埋藏深、油层薄、物性差。通过不断深化地质认识,依托大型压裂、深抽配套、高压注水、水平井等工艺技术进步,实施细分层调整与精细注水开发,油藏在产量大幅递减后又重新实现了大幅上产与稳产,标定采收率提高了10.65个百分点,2014年底达到44.05%,实现了低渗透油藏的高效开发,为同类型油藏提高采收率提供了借鉴。

In Qianjiang formation of Jianghan basin, Oian43 oil formation of Wangchang Oilfield is a low--permeability reservoir which has the largest oil--bearing area and geological reserves with characteristics of deep burial, thin oil bed and poor properties. By constantly deepening geological knowledge, relying on the progress of technologies such as massive fracturing, a complete deep pumping, high--pressure water injection as well as horizontal wells, and im- plementing fine separate--layer adjustment and fine separate--layer water--flooding, substantially increasing oil production and stable field has been achieved under the condition of sharply decreasing yield. Calibration recovery ratio has raised 10. 65 percent points, reaching 44. 05% by the end of 2014. The realization of high--efficient development of low--permeability reservoir provides the reference for enhancing oil recovery of reservoirs of the same type.