CLOSED HOLE CIRCULATION DRILLING

The overall process of pressurized mud-cap drilling is described by the term Closed Hole Circulation Drilling (CHCD).

The drilling of a sour, high-pressure fractured reservoir displays complex and hazardous well control situations. For example, while drilling the carbonate reservoir, multiple fractures encountered results in severe lost circulation followed by hydrocarbon influx into the well-bore.

Severe and uncontrollable lost circulation in the target reservoir prompts the use of special practices and equipment; thereby enhancing the safety and efficiency in the development drilling of the field.

A rotating control device (RCD) is employed to drill ahead blind (no fluid returns) by pumping a sacrificial fluid (water) down the drillpipe. Simultaneously, a pressurized mud-cap on the annulus with weighted oil based mud OBM controlls hydrocarbon influx. The overall process of pressurized mud-cap drilling is described by the term Closed Hole Circulation Drilling (CHCD).

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