海上特高含水老油田挖潜策略与措施——以珠江口盆地陆丰凹陷LFD13-1油田为例

Some strategical measures to tap the potential in offshore mature oilfields with extra-high water cut:a case of LFD13-1 field in Lufeng depression,Pearl River Mouth basin

珠江口盆地大部分油田已进入特高含水开发后期,综合含水率高,采油速度下降,剩余油分布零散,加密井网难度大,需要探索新的开发策略和工艺技术以实现油田的可持续开发。以陆丰凹陷LFD13-1油田为例,总结了海上特高含水老油田挖潜策略和措施:通过"纵向上层系转移"提高整个块状油砂体的垂向波及效率;通过非均匀井网加密开采分布零散的剩余油;通过水平分支井及MRC技术增大油井泄油面积、增强横向导流能力;通过自流注水补充地层能量方式建立有效注采系统提高单井产能;加大冲洗强度,通过换大泵提液等措施进一步提高油田整体采收率;积极寻找替代资源,实现老油田滚动开发。这些开发策略和措施的探索与实践,对海上同类特高含水期老油田的开发具有借鉴意义。

Due to being in the late development stage with extra-high waler cut, mosl oilfields in Pearl River Mouth Basin are characterized by oil- production rate decline, scattering dislribulionof remaining oil and difficult infill development, so it is urgent to seek new development strategy and technology for their sustainable production. Tak- ing LFD13-1 oilfield in Lufeng depression as a study case, some strategical measures to tap the production potential in offshore mature oilfields with extra-high water cut were summarized. （1） to improve the vertical sweep efficiency within a whole massive sandbody by ＂ vertical payzone transferring＂; （2） to exploit the remaining oil in scattering distribution through non-uniform infill- ing wells; （3） to increase the downhole oil-drain- age area and the lateral fluid transmissivity by drilling horizontally lateral wells and using MRC technique; （4） to build an effective in）ection-pro-duction system and improve the single-well produc- tivity in a mode of dump injection and formation- energy supplementation; （5） to enhance further the recovery factor of oilfields by taking some ap- proaches to increasing flushing intensity, such as lifting liquids with higher-power pumps; （6） to seek actively the backup resources and achieve a roiling development in the mature oilfields. These strategical measures may veloping similar offshore water cut. provide reference for de- oilfields with extra-high