试井解释在油井压裂效果评价中的应用

On Well Test Interpretation in Well Fracturing Effect Evaluation

压裂是一项油气层改造的重要进攻性措施之一,通过压裂提高近井地带储层的渗透率,提高地层流体的渗流能力,达到增产增效的目的。现场生产中压裂效果评价主要利用动态分析法,该方法的局限性在于不能从工艺或地层上对无效井进行分析,无法对工艺改进或深入认识储层提供可靠依据。而试井资料可有效对比措施前后流体曲线特征、流压、表皮系数、采液指数等的变化情况,对压裂后油井的效果评价更具有客观性,有利于指导后期措施选井。

High yield and high efficiency can be achieved by well fracturing, which contributes to increasing permea- bility of near--wellbore reservoir stratum and filtration capacity of formation fluid. In site production, fracturing effect is evaluated mainly by means of dynamic analysis method, which cannot analyze the invalid well based on tech- nology or stratum so that reliable evidences cannot be provided for technology reform or deeper stratum understand- ing. Well test information can help compare effectively before--measures fluid curve, flowing pressure, skin factor and fluid production index with after--measures ones so that the effect evaluation on fractured wells is more objec- tive, in favor of guiding measure--based well selection in later period.