扶余油田西区X区块精细注水开发实践及认识

A Fine Water-injection Development and Study for the West X Block in Fuyu Oilfield

扶余油田油藏受构造控制,为中孔中低渗储层,非均质性严重,目前已进入高含水开发后期,为了更好挖潜剩余油,针对开发矛盾,在西区X区块开展了精细注水开发试验,分东西部采取不同投产投注方式,开展多种周期注水方式,区块各开发指标均有所改善,稳产效果好。研究表明:水井加密实现了层系细分,增加油井平面受效方向,提高了井网对单砂体的控制程度,降低了层间干扰,提高水驱控制程度及波及体积;研究区平面剩余油分布零散,纵向上主要分布于主力层中,且主要集中于顶部,底部水洗严重;层间结构界面及薄泥质夹层具有遮挡作用,能够有效地控制油层吸水状况,从而控制纵向剩余油分布。

The oil deposit of Fuyu Oilfield is controlled by the structure.The reservoir with serious heterogeneity is medium porosity and medium-low permeability.At present,it has entered the late stage of high water development.For the development contradiction,to be better discovering remaining oil,a fine water-injection development test was carried out in the west X block.The west X block was divided into eastern and western parts and adopted different ways of putting it into production and betting.The various periodic water injection methods were carried out.Each development index of the block has been improved and the stable output effect is good.Research shows that the encrypted water-injection wells have realized stratigraphic subdivision and increased the effect direction of the oil well plane.It improved the control degree of well pattern to single sand body,reduced inter-layer interference and improved the control degree and swept volume of water drive.The remaining oil is distributed scattered in the study area.In the longitudinal direction,it is mainly distributed in the main layer,and mainly focused on the top.The bottom layer is badly washed.Interlayer structure interface and thin argillaceous interlayer have shielding effect.It can effectively control the water absorption condition of the oil layer thereby control that distribution of longitudinally remaining oil.