Abstract: On the view of different construction interface and different type of remaining oil distribution in thick formations of extra-high water cut period in Lamadian Oilfield,three kinds of fine inner potential excavation technology for thick oil formation were presented.The first one is the fine division water injection and plugging in a long rubber packer with a seal length of 1~3 meters.This packer can be used to jam the thin barrier and neighbour borehole.The thickness of construction interface jammed by this packer is 0.2 meter.The second one is the inner hydraulic slotting perforation technology.This technology is characterized by high accuracy for positional control and no quaking for slotting.The operation of this technology has no damage to the thin interbed and cement sheath.The barrier thickness is minimized to 0.2 meter.The third one is the inner positional balance fracturing technology.Six kinds of string can be used to protect the construction interface.The construction interface of 0.4 meter in thickness was tested.The three kinds of fine potential excavation technology were all used in large scale and became the new mode for inner potential excavation of the thick formation in the extra-high water cut period.

Key words: Lamadian Oilfield, extra-high water cut period, thick formation, remaining oil distribution, water injection technology, mechanical water shut off technology, hydraulic slotting, positional balance fracturing

摘要： 针对喇嘛甸油田特高含水期厚油层不同结构界面的情况和剩余油分布的类型,提出了种厚油层精细挖潜的采油工艺:①长胶筒封隔器细分注水、堵水工艺,胶筒长1～m,封卡薄隔层及附近的炮眼,封卡结构界面厚度为0.2m;②层内水力割缝射孔工艺,该工艺定位控制精度高,割缝无震动,对薄夹层及水泥环不产生损伤,试验的最小隔层厚度达到0.2m;③层内定位平衡压裂工艺,利用6种工艺管柱,可保护上、中、下结构界面及压裂层上、下结构界面,实施的结构界面厚度达到0.4m.这种精细挖潜工艺均得到了应用,对特高含水期厚油层挖潜有较好效果.

关键词: 喇嘛甸油田, 特高含水期, 厚油层, 剩余油分布, 注水工艺, 机械堵水工艺, 水力割缝, 定位平衡压裂