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Background: Typically, the casing stops short of the storage
well roof. However, it is not uncommon for various circumstances (roof collapse,
erosion, etc.) to result in the casing extending into the cavern. Historically,
this has resulted in an unknowable amount of petroleum product being trapped
between the bottom of the casing and the roof. Without an accurate measurement
of the volume of trapped product, it is difficult to determine whether efforts
to recover the trapped product will be cost effective.
Our customer’s story: A large cavern owner was faced with
just such a dilemma–trying determine whether it was cost-effective to perforate
the casing based on the amount of product trapped. Prior survey tools were
unable to accurately survey the cavern roof through the brine/product interface.
Gearhart-Sonasearch was called in and the Cavern Surveyor 07 survey team
successfully measured the storage well, accurately ensonifying the cavern roof
through the brine/product interface, as well as the 8 5/8" pipe string at 616'
and 13 3/8 casing/product interface at 604'. The Cavern Surveyor 07 Volume
Capacity Report shows a product volume of 15,140.976 barrels of product trapped
between the roof of the cavern at 591' and the 604' product interface. Given
accurate, timely and unambiguous data, the cavern owner was able to make the
decision to perforate the casing with confidence, recovering sufficient trapped
product for a positive return on investment.
For more information on the
Cavern Surveyor 07
or to locate an Authorized Sales
Representative in your area, please contact SONASEARCH at (425) 883-1984 or
info@sonasearch.com.
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SONASEARCH
