Study on the boundaries of natural gas drive gas fouling and gas fouling countermeasures
Due to the heterogeneity of offshore oil reservoirs and the strong breakthrough ability of gases,the problem of gas breakthrough in gas injection oil fields has become an inevitable trend.Therefore,in response to the problems of gas breakthrough,low gas injection efficiency,poor development effect,and difficult governance in natural gas flooding,this article takes the Wei-A section of the Weizhou 12-1 oil field as the simulation object,and combines the analysis results of gas breakthrough characteristics to segment the degree of gas breakthrough and clarify the stages of gas breakthrough.Based on the gas oil ratio change discrimination method,the gas oil ratio change rate is analyzed and quantified in detail.The research results indicate that the degree of gas breakthrough in non miscible gases can be divided into six stages based on the rate of change of gas oil ratio(no gas,gas front,gas breakthrough,trace gas production,gas breakthrough stage,severe gas breakthrough).For easily miscible gases,the degree of gas breakthrough can be divided into two stages:stable gas volume and stable increase in gas volume;For efficient development of gas breakthrough blocks,oil well production restrictions can be used to control gas breakthrough and expand the horizontal and vertical ripple effects.This division basis and countermeasure research can provide a theoretical basis for timely adoption of gas breakthrough prevention and control measures on site,and improving the development effects of mixed phase and non mixed phase flooding.
gas tampering characteristicsgas tampering degreegas tampering boundariesprevention and control measuresripple effect
NETL
NSTL
万方数据
维普
