why tight reservoirs has negative skin ?

[kochichiro]

Well, I’ll have a little different answer. In many cases, after drilling operations such reservoirs do not flow naturally, because they are completely plugged. Therefore, drilling team run several acid stimulations to get stable rate. From my experience I know that in Russia such operations in many cases are performed silently to cover inappropriate drilling conditions.

[Tejaswy]

From my experience I know that in Russia such operations in many cases are performed silently to cover inappropriate drilling conditions.

That does not make any sense, what does in appropriate drilling conditions have anything to do with Acid stimulation?

[vinomarky]

I think he was conveying that when the Drilling group fill the hole with overbalanced mud and damage the well, they may try to acid stimulate to recover some of the lost productivity, but avoid telling anyone for fear of repercussions