珠江口盆地难采储层工业化试采矿场实践——以陆丰凹陷LFC13-1油田α层为例

A field practice of industrial production test for hard-to-exploit reservoirs in Pearl River Mouth basin:a case of α interval in LFC 13-1 oilfield,Lufeng depression

制约LFC13-1油田α层开发的主要因素是储层渗透率低、天然产能低、过去的采油工艺及开发过程中水动力场不平衡等。2006年开始对α层进行工业化试采,并通过多种尝试最终取得了成功。文中总结了α层工业化试采矿场实践中的认识与经验:①通过转变开采方式和井型,提高了α层产能;②逐步上提完井层位,充分利用底水能量,变底水驱为类边水驱,增大了α层的波及效率;③利用"海恩斯跳跃"增进原油从α层远井地带向近井地带的渗流;④"过流产层"保障了规模动用α层的经济效益;⑤试采井泵型由少级数、低扬程、大排量向多级数、高扬程、小排量转变,提高了泵效,有效克服了启动压力的影响。α层初步整体动用方案预测结果显示经济效益显著。α层工业化试采实践对本海域同类难采储层的开发具有指导意义。

The main factors to restrain α interval development in LFC13-1 field are its lower permeability and natural productivity,the traditional production technology and the imbalanced hydrodynamic system during its development.An industrial production test of α interval commenced in 2006,and has resulted in the final success by several attempts.The cognition and experiences summarized from this field practice of industrial production test are： ①The productivity of α interval can be increased by changing the production types and well patterns;②Its swept efficiency can be improved by gradually reducing the well completion depth to make full use of the bottom water energy and to change the bottom-water drive into a pseudo-edge-water drive;③Haines jumps are used to enhance oil flow from the distant to nearby positions to wellbores within α interval;④The economic benefits to develop α interval on an industrial scale can be assured by the pass-flow pays;⑤ The transformation of ESP types in production test wells from less stages,lower pump heads and higher flow rates to more stages,higher pump heads and lower flow rates can improve the pump efficiency and effectively overcome the impact of start-up pressure.A preliminary estimation of the overall development plan for α interval has indicated significant economic benefits.This field practice of industrial production test is meaningful to guiding hydrocarbon development of similar hard-to-exploit reservoirs in this offshore area.