SoCalGas – Well Seal and Isolation Proceess

SoCalGas – Well Seal and Isolation Proceess


SoCalGas has made significant progress towards
completing a rigorous Two-Phase Well Testing Procedure of every well at our
Aliso Canyon Storage Facility. Wells that have completed Phase-One testing
and are awaiting subsequent actions must be approved as mechanically sealed and isolated
from the natural gas storage reservoir. The required process to mechanically seal
the well begins with the tubing and packer in place and the casing cement bond confirmed. A metal wire called a slickline is used to
lower a mechanical plug down the tubing. When the mechanical plug reaches the appropriate
depth, it is activated, locking it in place, and sealing the well from the natural gas
storage reservoir. A sliding sleeve door attached to the tubing is opened, allowing fluid to be pumped from the tubing
into the casing, filling and further sealing the well. In addition to being mechanically sealed,
each well is filled with fluid so that the hydrostatic pressure is greater than the pressure
of the natural gas storage reservoir, reinforcing the well’s isolation. With the fluid now in place, a pressure test is conducted on the well, witnessed, and approved by DOGGR. For added safety, continuous pressure monitoring
of the tubing and casing are conducted until the well begins Phase-Two testing or is permanently
plugged and taken out of service. This required process to mechanically seal
and isolate the well from the reservoir pressure offers a sound approach to maintaining the
ongoing safety of the field while in operation. SoCalGas is committed to the safety of our customers, our employees, and the communities we serve.

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