可循环泡沫钻井完井液防地层污染数值模拟

Numerical Simulation of Preventing Formation Contamination About the Circulating Foam Drilling and Completion Fluid

在现场施工中难以观察可循环泡沫钻井完井液的井下情况,为模拟其对地层的保护机理,建立了合理的地层孔隙简化模型,对可循环泡沫钻井完井液在井下如何防止地层污染的流场规律进行数值模拟分析,模拟结果表明可循环泡沫钻井完井液的气泡可以进入地层,有效地阻止了钻井液组分进入地层伤害储层,并随着孔隙尺寸不同而具有较好的适应性。在现场试验中也证实了可循环泡沫钻井完井液能够很好地保护油气层、防止储层受损伤。

It is difficult to observe the circulating foam drilling and completion fluid underground in actual production. In order to simulate the hydrocarbon reservoir protection mechanism, a reasonable strata simplified model of pore is established to analyze how to prevent formation contamination under the bottomhole circulating foam drilling and completion fluid with the numerical simulation. Results show that the air bubble of circulating foam drilling and completion fluid can go into the formation, and effectively prevent the drilling fluid from getting into the formation and damaging the reservoir. Furthermore, by testing in the site, it is proved that the circulating foam drilling completion fluid can be used to protect the reservoir rock and reduce the formation damage.