陆9井区薄层底水油藏水驱油规律研究

陆梁油田陆9井区由于受低幅度构造影响,成藏过程中单层(砂层厚度5～10m)未被充满,造成所有的油井同一层内形成上油下水的分布特点。油藏开发初期采用反九点面积注水井网开发,目前已进入中高含水期,采出程度为20%左右,为了挖掘剩余油潜力,应用油藏数值模拟结合实钻穿层井验证方法对薄层底水油藏水驱油规律进行了研究。研究结果表明,陆9井区薄层底水油藏水驱特征为底部水淹型,剩余油呈船底形状分布规律。

Law of Waterflooding in Thin Reservior with Bottom Water Wellblock Lu9

Cretaceous Hutubihe Formation in Wellblock Lu9 of Luliang Oilfield belonged to the sandstone reservoir with high permeability and thin beds and bottomwater. The obvious characteristics different with others included single layers (sand 5~10 m thick) were not filled during the reservoir formation influenced by low-amplitude structure, by which the distribution of upper oil and lower water in the same layer was induced in all the wells. At the initial stage of development, a reverse nine-spot pattern was used for development, it was at the stage of middle and high water content, recovery percent was about 20%. For the purpose of tapping the potential of remaining oil, the law of waterflooding in thin reservoirs with bottom water is studied by using numerical simulation in combination with drilled well proving. The result shows that the characters of thin reservoirs with bottom water in Wellblock Lu9 were water out on the bottom, the distribution of remaining oil is ship-bottom type.