稠油油藏水平井火驱技术风险与对策探讨

发布时间：2018-05-16 13:30

  本文选题：水平井火驱 + 稠油　； 参考：《特种油气藏》2017年06期

【摘要】：针对新疆油田风城重18井区稠油油藏水平井火驱出现气窜、井底高温、氧气超标等问题,运用稠油燃烧理论方程,研究了水平井火驱技术存在的风险。利用自主研制的三维火驱物理模拟实验装置,通过室内实验研究了不同直井水平井距离、注采参数对水平井火驱稳定燃烧的影响,并给出了最佳调控参数。研究表明:预热阶段形成均匀的蒸汽腔和泄油通道,点火初期保持燃烧前缘结焦带和"油墙"连续封闭且形成超覆燃烧特征,是水平井火驱稳定燃烧的重要条件。通过上部射孔方式增加直井与水平井垂直距离,实现初期超覆燃烧;现场注气速度为4 000 m~3/d、生产压差为1 MPa左右时,可保持注采平衡,防止气窜。通过调控,风城重18井区空气油比降至1 000 m~3/m~3,水平井段温度控制在200℃左右,成功避免了水平井的气窜,实现了水平井火驱的稳定驱油,为稠油油藏开发提供了新的技术手段。
[Abstract]:Aiming at the problems of gas channeling, high temperature at the bottom of the well and oxygen exceeding the standard in the horizontal well flooding of heavy oil reservoir in Fengcheng heavy 18 well area of Xinjiang Oilfield, the risk of horizontal well fire flooding technology is studied by using the heavy oil combustion theory equation. The effects of horizontal well distance and injection-production parameters on the steady combustion of horizontal flooding in horizontal wells were studied by laboratory experiments using a three dimensional physical simulation device developed by ourselves, and the optimal control parameters were given. The results show that the formation of uniform steam cavity and oil discharge channel in preheating stage, the continuous sealing of coking zone and "oil wall" at the initial stage of ignition and the formation of overburning characteristics are the important conditions for stable combustion of horizontal well fire drive. The vertical distance between vertical well and horizontal well is increased by the way of upper perforation, and initial overburning is realized. When the field gas injection velocity is 4 000 mm2 / 3 / d and the production pressure difference is about 1 MPa, the injection-production balance can be kept and gas channeling can be prevented. Through adjustment and control, the air / oil ratio in Fengcheng heavy 18 well area is reduced to 1 000 mm3 / mm3, and the temperature of horizontal well section is controlled at about 200 鈩，

本文编号：1896991