Gas Diffusion - Its Impact on a Horizontal HPHT Well

机译：气体扩散-对水平高温高压井的影响

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If a HPHT well with oil based mud is left undisturbed for arnperiod, eg. when tripping or logging, methane will diffusernfrom the formation through the mud invaded zone and mudrnfilter cake into the well bore. This can amount to substantialrnquantities and will occur despite an overbalance of mudrnhydrostatic pressure existing. Consequences can be potentialrnwell control problems when circulation is resumed or pipe isrntripped back into the well or degradation of mud propertiesrnincluding loss of weighting material or ‘baryte sag’.

机译：如果将油基泥浆的HPHT井放在井口，则不受干扰。跳井或测井时，甲烷将从地层中扩散穿过泥浆侵入区，滤饼进入井筒。这可以达到相当大的数量，并且尽管存在泥浆静水压力的过度平衡也将发生。当重新开始循环或将管道重新拉回井中或泥浆特性降低（包括称重材料或“ Baryte凹陷”的损失）时，后果可能是井控问题。

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来源
《SPE annual technical conference and exhibition;SPE 2002》|2002年|p.1-6|共6页
会议地点 San Antonio TX(US);San Antonio TX(US)
作者
Nigel D. Bradley; Eric Low; Bjarne Aas; Rolv Rommetveit; Hans F. Larsen;
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正文语种 eng
中图分类石油、天然气加工工业;
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Gas Diffusion - Its Impact on a Horizontal HPHT Well

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