Primary Well Control
Definition - What does Primary Well Control mean?
Primary Well Control is the hydrostatic pressure induced while drilling which is more than the formation pressure but less than the fracture gradient. It prevents an influx of formation liquid into the wellbore. In order to provide sufficient pressure, it uses mud weight. The technique is used in variant operations related to the oil and gas industry like well workover, well completions and drilling. It is important to understand well-control principles and procedures so as to monitor potential blowouts properly.
Petropedia explains Primary Well Control
Primary Well Control should be maintained properly while tripping, drilling and circulating on the bottom. The main causes of loss of primary control are insufficient fluid density, failures to fill the hole correctly and swabbing. The main aim of using this well control method is to carry out all the operations safely without any detrimental effects to the atmosphere. To achieve this goal, Primary Well Control should be maintained at all times. However, offshore drilling operations are more difficult to handle as compared to onshore operations. If the hole of drilling fluid is not maintained then it causes loss in Primary Well Control that affects the fracture formation.