ARCO阿拉斯加有限公司针对普鲁德霍湾油田三叠纪Ivishak砂岩构造、地层、沉积以及流体分布的复杂性,运用水平井和一种新的提高采收率方法采出了未动用或未波及储量。Ivishak砂岩油藏大部分是断块中的孤立构造,面积100多英亩,储量由于钻常规井而有一定损失,这是因为排油面积小和气体快速锥进。90°水平井或鱼钩状井筒增大了生产砂岩层的接触面积。1992年至1996年间,结合新的钻井和地质导向技术初次钻井成功率提高2倍。混相注入剂增产处理(MIST)工艺,提高水平井采油量上百万桶。在一个MIST项目中,1口水平井从现有的水淹井网钻进,当井筒沿弧线钻进到注入井和外沿生产井之间时,井筒靠近油藏底部达到了最大驱油效率。混相注入剂一直注到井的末端,形成气泡推动油向生产井移动。充分注入后,射孔井眼被塞满,然后在靠近井筒底部再次射孔。通过连续注气,使气挤入井眼,在最接近井眼的部位再射孔,注水后的油就从油藏中驱替出来。截至发稿时,3口水平井中采用EOR方法增产原油超过了1·3MMSTB,模拟预测每口井增产原油超过一百万桶。 ARCO Alaska Co., Ltd. In response to the complexity of Triassic Ivishak sandstone formations, formations, sediments and fluid distribution in the Prudhoe Bay field, horizontal wells and a new method of enhanced oil recovery have been used to extract unused or undiscovered reserves . Most of the Ivishak sandstone reservoirs are isolated structures in fault blocks with an area of ​​more than 100 acres. Reserves have been lost due to drilling of conventional wells due to the small drainage area and rapid gas coning. A 90 ° horizontal well or a hooked well increases the contact area of ​​the production sandstone. Between 1992 and 1996, the success rate of primary drilling combined with new drilling and geosteering techniques was tripled. Mixed-phase Injector Production Enhancement (MIST) process increases millions of barrels of horizontal well production. In a MIST project, a horizontal well was drilled from an existing flooded well and when the wellbore was curved along the arc between the injection well and the peripheral production well, the wellbore approached the bottom of the reservoir to achieve maximum flooding efficiency . The mixed-phase injectant is injected into the end of the well to form bubbles that push the oil to move to the production well. After full injection, the perforated wellbore is filled and then perforated again near the bottom of the wellbore. By continuously injecting gas, the gas is forced into the wellbore and re-perforated at the site closest to the wellbore. The flooded oil is displaced from the reservoir. At the time of writing, EOR was used to increase crude oil production in the three horizontal wells by more than 1.3MSTB. The simulation predicts that more than one million barrels of crude oil will be produced per well.