Pipeline Management & Maintenance.

Hi everybody,

The water production lines were pigged from the water collection manifold at the CPF Plant towards each well site.

Each line at the manifold is equipped with a blind flange. Each line will be isolated and depressurized and an isolation ball valve will be installed that will allow connection of the mobile launcher. At each well site, the end of each line is equipped with a blind flange. Each line will be isolated and depressurized and an isolation ball valve will be installed that will allow connection of the mobile receiver.

As a minimum, the following pigs are used for each pig run of water supply lines:

- Proover pig.

- Bi Di pig.

-Bi Di brush pig.

We have used firstly the mechanical pig run in order to get the maximum debris collection and progressively we check the cleanup degree of internal pipeline.

The chemicals used for the water source lines cleaning will be 15% HCl mineral acid, neutralizer, and high viscosity pick up gel.

The second stage, we used chemical pig train (HCL solution) which carries solids and any residual from the pipe wall HCL will penetrate iron sulphide, iron oxides, mineral deposits, & sand to break up dense deposits.

The pig train velocity is constant at a speed of no more that 0.3m/second to allow sufficient contact time for the chemical to penetrate and remove solids.

The objective of these runs is to progressively clean the line to remove scales & corrosion debris.

Regarding all Photos of each run pig on receiver, it is clear that water source well is suffered by bacteria/H2s Corrosion Problem (see attached photos).

Is it sufficient this pig procedure as defined or shall we biocide treatment added in order to kill bacteria along the pipeline?

I appreciate a quick answer and thanks a lot in advice.

Best regards,