Type of Operation

Description

Drilling

While drilling in the lateral section of a horizontal well, a trip is required to change out a failed BHA component. The crew failed to fill the hole and neglected trip volumes. With the BHA was across the stack, the well started flowing and the annular failed to seal. The well blew out for several weeks while a relief well was drilled.

Drilling

While drilling ahead below a shallow set surface casing shoe of unknown integrity, flow was observed. The well was shut-in and the driller’s method used to circulate the influx out. During the circulation, water broached the surface at multiple locations adjacent to the drilling site. Surface flow continued for 10 days while cement plugs were set to isolate the water flow and squeeze the shoe.

Completion

While performing hydraulic fracturing operations through production casing the production and intermediate casing fail. Surface pressure readings indicate that the well is flowing up the production casing, through a breach in casing strings and into a shallow zone. Remediation with coiled tubing including cementing and a dynamic kill were necessary to isolate the leak and kill the well.

Workover

Following several months of initial production, a well is filled with brine in order to install a tubing string. While running in the hole with tubing, a sand bridge is encountered and the well begins to flow. The BOP is closed but the well flows through the tubing and the crew is unable to stab a valve onto the tubing. The well is killed the following day by pumping heavy brine down the annulus.