井筒积液反渗吸伤害对低渗低产气井产能的影响研究

The Study of Influencing Factor for Gas Well Productivity in Low Yiedy ang Low Permeability For-Mation for Reverse Imbibition Damage

低产水气井的携液能力有限,易造成井底积液反渗吸伤害。通过井筒积液反渗吸实验研究了反渗吸动态特征,随渗吸进行,含水饱和度升高,平均自吸速度降低,最大含水饱和度达到62.6%~88.4%,渗透率损害率在46.15%~96%,平均为78.4%。本文在实验研究的基础上,计算出反渗吸的伤害深度,并通过不同的产能公式对比了不同反渗吸伤害程度对气井产能的影响。实例计算结果与实验结果保持着一致性,随着含水饱和度的增加,渗透率下降,反渗吸动态表皮系数增大,产能的降幅越来越大。

The low-yielding gas wells producing water have the limited carrying capacity of liquid that cause the liquid loading and reverse imbibition damage.The dynamic reverse imbibition characteristics was studied by the liquid loading and reverse imbibition experiment.With the imbibition progress,water saturation increased;average rate of imbibition decreased;the largest water saturation reached to 62.6%～88.4%.And the permeability damage is 46.15～96%,with an average of 78.4%.based on experimental study,This paper...