考虑各向异性的蒸汽吞吐效果及见水时间预测

Cyclic steam stimulation effect considering anisotropy and water breakthrough time prediction

曾泉树 汪志明 孙立伟 高清春 唐爱纯

中国石油大学（北京）石油工程学院，北京 102249 中国石油集团长城钻探工程有限公司工程技术研究院，辽宁 盘锦 124000 国家石油天然气管网集团有限公司西气东输分公司，湖南 长沙 410001

针对辽河油田稠油生产井见水时间和综合含水率变化规律认识不清、地层各向异性严重的问题，文中以热力学为基础，以能量守恒方程和油藏工程方法为手段，考虑地层各向异性对热采井热损失和渗流的影响，研究了稠油生产井见水时间和综合含水率的变化规律，建立了考虑各向异性的稠油生产全过程计算模型及见水时间预测模型，在此基础上着重分析了储层渗透率对水平井流入动态的影响，即水平井见水时间和见水后综合含水率的变化情况。研究结果表明：随着垂向渗透率的增大，油井综合含水率和日产水量快速上升；当垂向渗透率和水平方向渗透率的比值从基准值上升为0.5时，油井无水采油期缩短12 d，而总生产周期延长215 d。该研究成果对提高油藏动用程度和保障稠油效益开发具有重要的意义。

Aiming at the problems of unclear variation law of water breakthrough time and comprehensive water cut in heavy oil production wells and serious formation anisotropy in Liaohe Oilfield, based on thermodynamics, energy conservation equation and reservoir engineering method, considering the influence of anisotropy on heat loss and seepage in thermal production wells, this paper studies the variation law of water breakthrough time and comprehensive water cut in heavy oil production wells. The calculation model of the whole production process considering anisotropy and the prediction model of water breakthrough time are established. On this basis, the influence of reservoir permeability on the inflow performance of horizontal wells is emphatically analyzed, that is, the change of water breakthrough time and comprehensive water cut after water breakthrough. The results show that with the increase of vertical permeability, the comprehensive water cut and daily water production of the oil well rise faster. When the ratio of vertical permeability to horizontal permeability rises from the reference value to 0.5, the anhydrous oil production period is shortened by 12 days, and the total production cycle is prolonged by 215 days. The research results are of great significance to improve the reservoir producing degree and ensure the benefit development of heavy oil.

10.6056/dkyqt202203018