厚层稠油油藏直平组合火驱优化

In-situ combustion optimization of vertical and horizontal wells combination for heavy oil reservoirs with thick layer

赵睿智 陈明贵 高飞 程海清 宋杨 喻高明 2

长江大学石油工程学院，湖北 武汉 430100 国家能源稠（重）油开采研发中心，辽宁 盘锦 124010 中国石油辽河油田分公司，辽宁 盘锦 124010

School of Pertoleum Engineering, Yangtze University, Wuhan 430100, China National Energy Heavy Oil R&D Center, Panjin 124010, China Liaohe Oilfield Company, PetroChina, Panjin 24010, China

文中根据辽河油田G3区块火驱试验区地质油藏特征、火驱实验数据，运用油藏工程、数值模拟及分析化学方法，建立了包含4相7组分火驱反应动力学方程，并拟合物理模拟结果及实际生产动态，确定方程配平系数、指前因子、活化能、焓变值等关键参数，建立了该区块火驱油层数值模型。同时，对影响直平组合火驱开发效果的水平井与直井的位置、水平井在油层内的纵向位置、水平段长度、注空气强度及水平井排液量等关键参数进行了优化设计。研究结果表明：该区域水平井部署在油层中部位置、水平段合理长度为280~300 m、合理注空气速度在1.0×104~1.5×104 m3/d、水平井采液速度为50~70 m3/d时，水平井及其所在井组产量稳定，采出程度较高，开发效果较好。研究结果对该区域直平组合火驱方案设计及相似油田同类方案设计具有指导意义。

Based on the geological reservoir characteristics and experimental data of the in-situ combustion in Block G3 of Liaohe Oilfield, reservoir engineering, numerical simulation and analytical chemistry methods are applied in this paper. Firstly, a 4-phase 7-component in-situ combustion reaction kinetic equation is established and used to fit the physical simulation results and actual production. Then the key parameters such as the equation balance coefficient, pre exponential factor, activation energy, and enthalpy change value are determined and an in-situ combustion numerical model of the block is established. Finally, the key parameters which affect the development performance of the in-situ combustion with the combination of vertical and horizontal well such as the position of horizontal wells and vertical wells, the vertical position of horizontal wells in the reservoir, the length of horizontal sections, the intensity of air injection, and the discharge volume of horizontal wells are optimized. The research results show that the horizontal well and the well group have stable production and high degree of production, and have achieved good development performances when the horizontal wells in this area are deployed in the middle of the reservoir structure, a reasonable length of the horizontal well is 280-300 m, a reasonable air injection rate is 10,000-15,000 m3/d. The research results have guiding significance for the scheme design of the in-situ combustion with the combination of vertical and horizontal well in this area and the similar scheme design of similar oilfields.

10.6056/dkyqt202002019