What is Primary Well Control?

Primary Well Control is hydrostatic pressure provided by drilling fluid more than formation pressure but less than fracture gradient while drilling. If hydrostatic pressure is less than reservoir pressure, reservoir fluid may influx into wellbore. This situation is called “Loss Primary Well Control”.

Not only is hydrostatic pressure more than formation pressure, but also hydrostatic pressure must not exceed fracture gradient. If mud in hole is too heavy, it will cause a broken wellbore, you will face with loss circulation problem (may be partially lost or total lost circulation). When fluid is losing into formation, mud level in well bore will be decreased that will result in reducing hydrostatic pressure. For the worst case scenario, you will lose the primary well control and wellbore influx or kick will enter into wellbore.

Typically, slightly overbalance of hydrostatic pressure over reservoir pressure is normally desired. You must keep in mind about the basic of maintaining primary well control that you must maintain hole with drilling fluid that will be heavy enough to overbalance formation pressure but not fracture formations.

Reference book: Well Control Books

Please follow and like us:
0

Related Post

Directional Drilling Handout from Texas AM I would like to share very useful Power Point slide in the topic of directional drilling which is belong to Texas A&M university, USA. Directio...
Adjusted maximum allowable shut-in casing pressure You calculate the maximum initial shut-in casing pressure (MISICP) based on the original mud weight before you start drilling ahead. Once you drill de...
Baker Hughes To Cut Pay In Effort To Avoid More Jo... Houston-based Baker Hughes Inc. plans to begin a temporary furlough program for some employees. “In response to challenging industry conditions, Bake...
What is Tertiary Well Control? Can you imagine if primary and secondary well control are failed? Well is flowing all the time so how can we deal with this situation? For this situat...

About DrillingFormulas.Com

Working in the oil field and loving to share knowledge.
Tagged . Bookmark the permalink.

4 Responses to What is Primary Well Control?

  1. Pingback: What is Secondary Well Control?‎

  2. Ehis Oribhabor says:

    Like to know if there is a training or course available wireline operations from your end.
    Thanks
    Ehis

  3. Gokul sharma says:

    Well control is most important of drilling session whatever we use the instrument which is used for drilling but starting of any problem our first focus must be primary well controll

Leave a Reply

Your email address will not be published. Required fields are marked *