Kick in killed wells

[jogtt]

Hi,

I would be grateful if anybody could help me shed light on the situations below, suggested for a WO operation, where the well fluid column presumably remains under static conditions:

1. Is it possible to get a kick in a petroleum well once it is killed if an hydrostatic eqiulibrium/ overbalanced pressure situation is achieved using a heavier killing fluid than those in the reservoir? I understand that due to difference in densities, lighter fluids will tend to migrate towards the top of the fluid column in the well in the long term.

2. On the other hand, How is it possible to get a kick in a well with lost circulation?
For killing mud to be force into the formation an overbalance pressure between the well fluid column and the reservoir pressure must exist. As killing fluid is injected into the formation (with no killing fluid being replaced), at some point that overbalanced situation will become a perfect hydrostatic condition as the fluid level in the well diminishes.Hence no matter the fractures/cavities/vugs in the reservoir -apparently filled with fluids-, no fluid can be forced from the well into the formation -assuming no pressure disturbance due to swabbing, surging, etc. is taking place-.

Many thanks in advance.

[Tafuti]

Unlike drilling, in WO situation you have the well cased and perforated. In most cases, you have one formation to work with one pressure gradient. If the well is killed and static you will not have gas migration uphole.
If you have losses into formation, then you have to take action. Depending on well configuration and the objective of WO, this might include use of LCM, temporarily isolating the zone with plug, cementing, or in some severe cases working with total losses (you give the well whatever it can drink to maintain the fluid column).