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EXPERT APPRAISAL OF UGSF WELLS INDUSTRIAL SAFETY
Arkady A. Engibaryan (“Gazprom PKhG” LLC)
“Gazprom PKhG” LLC operates 21 underground gas storage situated at 25 storage
facilities, 17 of them being constructed in depleted gas reservoirs and 8 – in water-bearing
At the beginning of 2010 the stock of its rented and owned wells without regard to the
abandoned and special-purpose wells comprised 3755 units, with 2601 of them being
production wells and 1154 – observation wells of all kind.
The primary purposes of well industrial safety expert appraisal are as follows: evaluation of
UGSF wells technical condition and their operational suitability in a specified UGSF mode;
determination of safe well operational lifetime on the basis of complex researches;
determination of residual well lifetime; extension of residual well lifetime.
It is proposed that operational expert appraisal of well technical condition indices should
be conducted within the frames of 4 groups:
bore hole and bottom hole formation zone;
tubing-casing and behind the casing annular space;
wellhead zone and wellhead equipment.
Each of the considered indices or criteria indicating a well component condition is given its
numerical score on a ten-point scale basis with a total score being subsequently
calculated. This total score makes it possible to objectively evaluate the technical condition
of an item subject to expert appraisal.
In 2009 industrial safety expert appraisal was carried out at 7 “Gazprom PKhG” LLC
storages. The total number of wells subject to industrial safety expert appraisal amounted
to 108 (of 159).
Poor condition of cement behind the casing strings or inter-string pressure may cause safe
well lifetime reduction.
If the expert appraisal of a well industrial safety reveals pressure strength margin absence
as well as casing or flow string defects such wells are considered to be extremely
hazardous in the context of technogenic formations and surface gas seeps possible
accumulation in the form of springs or gas pockets.
The optimal complex of technical diagnostics has been worked out including magnetic
pulse inspection, gamma-gamma density method, acoustic thickness measurement,
cement bond logging, thermal logging, pulse neutron-neutron logging.
“GAZPROM PKhG” LLC AS A CORE UNDERGROUND GAS
STORAGE ENTERPRISE. ORGANIZATION AND OPERATION
Garry S. Golod (“Gazprom PKhG” LLC)
“Gazprom PKhG” LLC, a core Gazprom JSC underground gas storage subsidiary, was
founded in 2007 by means of UGSF-related assets allotment from gas transport enterprise
structures with their subsequent consolidation into the newly formed “GAZPROM PKhG”
LLC company. The process in question took place within the frames of Gazprom JSC
internal corporate management system restructuring aimed at cost optimization by
individual kinds of activities – transportation and underground storage of gas.
The current organizational structure of the company comprises 21 branch including
19 manufacturing enterprises, with 3 branches being in a formative stage. “Gazprom
PKhG” LLC operates 21 underground gas storages (25 gas storage facilities) with their
active construction capacity exceeding 65.0 billion cubic meters. Due to the fact that UGSF
14 has already been under operation for more than 30 years, the company’s management
team deems its necessary to insure safe and sustainable operation of all the gas storage
process systems and equipment on the basis of their retooling, modernization and
production capacities technical condition maintenance at an appropriate level.
Solution to the abovementioned problem cannot be found without the industrial safety
system development. In order to meet the acting Russian Legislation requirements the
system of industrial safety insurance has been created and implemented in the company,
with industrial safety expert appraisal and technical diagnostics of UGSF process
equipment and technical facilities being its main constituents.
The results of the work carried out in the field of industrial safety expert appraisal and
technical diagnostics make it possible to obtain reliable information on the actual (current)
technical condition of the facilities; these results constitute the basis for their optimal
operation modes planning, as well as for determining the scope and terms of repair and
During a comparatively short period of “Gazprom PKhG” LLC existence it has been proved
that this core company is effective from both technological reliability and economic
sustainability standpoint. Alongside with these, gas transport and underground storage
tariffs have become more “transparent”, which has had a positive impact on the gas
market liberalization and facilitated independent suppliers’ access to the Unified gas
supply system facilities.
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