GAPS® Identifies Gas Source to Diagnose Crossflow from Nearby Well, Saving $150,000

Identify the source of gas to enable effective remediation of leaks in an onshore gas-storage well.

The Weatherford team met with the operator to discuss the extent of their potential vent-flow problems and their remediation plans, which initially involved perforating and squeezing multiple intervals along the length of the wellbore.
Weatherford wireline logging personnel ran the vent flow repair service to accurately diagnose the downhole source of gas migration. Their suite of logs included: the C-THRU compact through-casing evaluation service to identify fluids behind casing; GAPS geophone array production survey for acoustically locating gas or water leaks: and the SBT sector bond tool, to measure the quality of the cement bond.
The team showed the operator where GAPS logging measurements revealed that the source of gas migration was actually crossflow from a nearby well. Gas from the offset well was entering the adjacent gas-storage wellbore above the surface casing.
To confirm the source of the gas, the wireline crew ran the vent flow repair service in the offset well. The resulting logs showed a deep gas source feeding a shallow sand that cross-flowed over to the original well.

Identification of the gas source enabled the operator to perform a single intervention in the offset well, which solved the gas migration problem for both wells.
Quick economical identification of the vent-flow source allowed efficient remediation and abandonment of the well.
The vent flow repair service saved an estimated $150,000 by preventing additional repair attempts in the wrong well.

Details

Location

Kentucky, USA

Well Type

Gas storage well

Deviation

Vertical

Casing Size

4-1/2 in.

Total Depth

574 ft (175 m)

Products/Services

MARS™