魏岗油田高压注水实践与认识

Practice and knowledge on high pressure water injection in Weigang oil field.

河南油区魏岗油田构造复杂，油层较薄，平面物性变化大，储集层流动孔隙小，地下油水渗流阻力大，加上原油的“两高一低”（ 高含蜡、高凝固点、低含硫量） 特点，微观水驱油特征表现出驱替阻力进一步加大，宏观水驱油特征上表现出油田注水启动压力高。该油田采取常压注水方式开采，多数单井很难达到配注要求，区块单元难以达到方案设计的开发效果，采用常温注水开发则必须采用整体高压注水。经过高压注水论证、单井试注、区块高压注水推广及全油田高压注水推广，实现了高凝油藏整体高压注水长期高效开发的目标，创出了河南油区水驱油田中开发指标的“四个第一”（ 稳产年限最长、含水上升最慢、地层压力保持水平最高、存水率下降最缓） ，使整体高压注水开发模式在魏岗油田这种中渗透高凝油藏的水驱开发中取得成功。图４ 表１ 参２（杨堃摘）

Weigang oil field in Henan oil province exhibits an increasing driving resistance in micro displacement of oil by water and a high starting pressure of water injection in macro displacement of oil by water, due to its complex structure, thin layers, big areal variation in petrophysical properties, small flowing pores, high flow resistance to fluid and the “two high one low' oil properties, i.e. high wax content, high pour point and low sulphur content. The normal water injection pressure adopted by the field in the past is hard to meet the injection allocation requirement in many single wells and to reach the development efficiency designed in FDP. When water of normal temperature is injected, overall high pressure of injection must be taken. By way of high pressure water injection demonstration, single well injection test, area and even whole oilfield high pressure water injection spread, the long term high effect development target come true in the high pour point reservoir. Therefore four firsts in water flooding oilfield development norms are created, they are the longest stable yields time, the lowest water cut rising, the highest formation pressure keeping standard and the lowest reducing of water storage rate. Thus the high pressure water injection development type is achieved in the special reservoir of Weigang oil field.