边底水油藏火驱注气速度室内实验研究

火驱技术已成为边底水油藏吞吐开发中后期重要接替开发方式。为了解决边底水油藏由于水体存在热效率低、火线前缘温度低及拓展慢的问题,以辽河油田J9块为研究对象,利用火驱一维物模装置,研究了边底水油藏火驱过程注气速度对燃烧温度、火线推进速度、压力的影响。实验结果表明:水侵油藏火驱过程注气速度越大,增压作用越明显,模型压力由0.049 MPa升到0.49 MPa,火线前缘温度最高达到858℃。对于边底水油藏实施火驱技术开发,维持燃烧的最低注气速度较原始油藏火驱高,至少为8 L/min即注气强度为288 m³/(m·d)。火驱过程采用变速注气方式,适当加大注气强度满足边底水侵入油藏对热量的需求,实现火线前缘温度稳定,保证火线稳步推进。研究结果可为同类油藏开发方案优化设计提供指导和借鉴。

Laboratory experimental research of gas injection rate of fire floodingin the edge and bottom water reservoir

Fire flooding technology has become an important alternative development mode in the middle and late period of huff and puff development of edge and bottom water reservoir.In order to solve the problem of low thermal efficiency of edge and bottom water reservoir,low temperature and slow expansion of front edge of fire line,this paper takes J9 block of Liaohe Oilfield as the research object,and studies the influence of gas injection speed on combustion temperature,fire line propulsion speed and pressure in the process of fire drive by using one-dimensional physical model device of fire drive.The experimental results show that the larger the injection velocity and the more obvious the pressurization effect,the higher the model pressure is from 0.049 MPa to 0.49 MPa,and the highest temperature of the front of the fire line is 858℃.For the edge and bottom water reservoir,the minimum gas injection rate to maintain combustion is higher than that of the original reservoir,which is at least 8 L/min,that is,the gas injection intensity is 288 m ³/(m·d).In the process of fire floodinge,variable speed gas injection is adopted,and the gas injection intensity is properly increased to meet the heat demand of edge and bottom water invasion reservoir,so as to realize the temperature stability of the front edge of the fire line and ensure the steady progress of the fire line.The research results provide guidance and reference for the optimization design of this kind of reservoir development plan.