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Photos b

y: Geir Ov

Titlestad & Sebastian  Sik



Applicable for DH5R and DH7a
15000 psi (1000 bar) equipment
BQ string pressure rating is 5700 psi (395 bar)
NQ string pressure rating is 4500 psi (313 bar)

Well Housing

HSE summary

All well activities so fare in the project has been performed to an acceptable HSE standard. There have been a few 
reportable incidents and two of those have included first aid treatment. Neither of these two incidents that included 
first aid treatments resulted in any permanent injuries or sick leave. All reported incidents have been analysed, dis-
cussed and resulted in recommended improvements.

The unexpected amount of gas present in some of the wells required high attention and preventive arrangement was 
incorporated. Risk reducing actions related to the gas were implemented for the wells activities. 
The equipment supplied for pumping and cement services was “North Sea” equipment and certified for offshore use. 
The equipment that was supplied locally was manufactured and designed to be utilized in the arctic environment. 
There have not been any abnormal risks related to operate the equipment since the equipment has been maintained 
properly and in good shape.

All personnel were well experienced and understood their roles and responsibilities. When starting new operations 
and activities kick-off and pre-job meetings with involved personnel were undertaken. Throughout the activities 
there have been established clear and good communications which significantly have helped to minimize and keep 
the associated risk at acceptable level. 

For each well program a risk matrix was made and issued. The risk matrix was discussed in the kick-off meetings. The 
reportable incidents and examples of


risk matrix are enclosed in the attachments (see Appendix).

Due to the gas and pressure in three of the wells there have been taken some required actions and established rou-
tines around how to check and inspect these wells. The following actions and routines have been introduced: 



Install well house over each well


Install/make ventilation in top and bottom of the well houses


Mark the well houses with sign saying – danger gas under pressure and all open fire are strictly forbidden


Mark the well houses with reflectors


Establish routines to inspect the pressure and the wells for leakage  routinely.


Check that the ventilation is not covered (with snow)


Verify that there is no gas in the well houses – use gas detection device


Check that the signs and reflectors are properly fasten and visible


Establish plans for how to handle leakage and how to secure and plug the wells.

Status and securing

After all well activities, the wells that contained gas were shut-in with a plug valve and blind cap with pressure gauge. The picture 
below shows how the well DH7a was left and secured after finalized test program. A similar well head setup was mounted on 
Dh5R. The wells were under supervision for longer periods before they were plugged.

A picture below shows the well house or “pyramid” that protects the well head. All wells (that are not plugged and abandoned) in 
the well-park are covered with these well houses.

Photo By: Cathy Braathen

Adding Salt to the drilling solution 2012