巨厚层砂砾岩底水油藏注水开发研究

雷64块为块状砂砾岩底水油藏,油层巨厚,最厚可达200 m,储量丰度大.在油藏天然能量、储层特征分析和应用解析公式、数模方法对注水开发采收率变化、采液和采油指数变化趋势、注水方式、注采井网、见水时间研究的基础上,认为雷64块应该采用两套层系、人工注水开发.下层系以注底水层为主,在局部底水与油层之间隔层较发育的部位,进行层内注水.与潜山油藏不同,块状砂砾岩油藏仍具有层状特性,实际工作中需要认真分析隔层因素,在实施两套层系、正方形井网210 m井距的情况下,注采井距成为影响注水开发效果的主要因素.采用分采合注,将因部分注采井距达到150 m而大大加速水淹水窜,影响开发效果.

Water-flood Recovery in Huge Pay layer Botton Water Reservoir

Reservoir Lei64 is a sand-conglomerate bottom water reservoir, with huge thick pay layer and plentiful reserves abundance. Natural energy, the pay layer characteristic ,the oil reserve recovery factor improved,IPR changing trend, waterflood pattern as well as breakthrough time was analyzed and studied by analytics formula and reservoir simulation in the paper. It was advised that the Reservoir L64 should adopt two sets of develop layers and waterflood recovery. Water should be injected in bottom water in lower layer. Different from the antiquity hidden mountain reservoir, a sand-conglomerate reservoir still have the layer characteristic, needing the earnest analysis interlayer. Under the situation of two sets of development layers, exact 210 meters square pattern, the produce-inject well spacing becomes the main factor influencing waterflood development result.