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Basic
Services:
Production activities of PE ‘Poltava Geophysical Works Administration’ are
connected with the organization and execution of industrial perforating and
shooting operations while exploring, prospecting and oil-, gas- and other
minerals field operating, as well as complex interpretation of the geological
and geophysical data on-site.
Public Enterprise ‘Poltava Geophysical Works Administration’ (PGWA), Ministry of
Fuel and Energy of Ukraine – is a service enterprise, which has at its disposal
state-of-the-art technology and practices for the execution of range of
high-performance geophysical investigations (GI) in prospecting boreholes,
exploratory and production wells, as well as in the boreholes of producing well
stock during oil- and gas-field development and gas reservoirs supervision.
Operating the wells on the territory of Dneprovsko-Donetska Depression (DDD) for
more than 30 years, meeting the conditions of every agreement timely and
properly, PE ‘Poltava Geophysical Works Administration’ has found acceptance and
gained well-deserved prestige with its ‘Customers’. Carrying out timely and
competent technical modernization, 10 years ago PE ‘PGWA’ was the first of
similar Ukrainian enterprises to entirely switch over to the usage of
computerized well logging systems in GI and to introduce computer bundled
software instruments for geophysical data processing and interpretation. It gave
an opportunity to increase the efficiency of geophysical investigations
considerably and to enhance the means of rendering better services of higher
quality to the ‘Customers’.
At ‘Customer’s’ will, both graphical presentation data (diagrams and graphs) and
processed measurement data are issued directly on the borehole site using the
methods of section gage logging, cement-bond logging, directional and deviation
survey and impulse neutron-neutron logging (INNL).
In case of production need immediately after the measuring, the data received
can be transferred through international satellite communication channels to the
GI data processing and interpretation centre of Poltava GWA in order to speed up
the decision-making as to the specific well. After the processing and
interpretation, the GI data is transferred through communication channels
(modem) straight to the ‘Customer’.
Efficient discovery of pay horizons is provided by the available and accurate
perforating technique performances:
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tubing perforation under pressure;
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pressure drawdown perforation through the tubing in sealed wellhead by wireline
pressure-control equipment ULG 65 õ 35 (ÓËÃ 65 õ 35);
-
perforation while tubing pressure drawdown, which allows to put a well on
production immediately without pulling the tubing.
Various types of state-of-the-art perforating systems and jet charges are used
for the perforation:
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Ukrainian manufacture – ZP-1-67-150 (ÇÏ-1-67-150);
-
Russian Manufacture – ZPKO-89-200 (ÇÏÊÎ-89-200); ZPKO -89Å (ÇÏÊÎ-89Å); ZPKS -80
(ÇÏÊÑ-80); PR-43 (ÏÐ-43);
-
German manufacture – ‘Dynamit Nobel’ company – different modifications with high
penetration;
- American
manufacture – ‘Owen’ and ‘Schlumberger’ companies.
The enterprise carries
out different services, such as cement bridging mounting, GI with the aim of
technological well condition supervision, identification and elimination of
drilling tools sticking, spotting of casing and tubing leakage, annular
formation fluids cross-flow, lost circulation gaps, drilling mud perforation,
identification and elimination of other borehole emergencies.
In the act of borehole drilling the enterprise carries out geological
technological investigations, which allow the company to solve technological and
geological problems in the drilling process, to detect promising borehole
cross-section gaps, to assess saturation nature and to prevent gas contamination
of the drilling mud and uncontrolled gas blowout.
The investigations in
the boreholes of producing well stock during oil and gas-field development
supervision are carried out by means of time-domain measurements by impulse
neutron-neutron logging INNL, gamma-ray logging (GRL) and acoustic logging (AL).
Through this work package the following key tasks are performed:
-
current oil-water contact (gas-water contact ) depth in operating horizons is
defined;
- specification and
updating of reservoir beds saturation is carried out;
-
new payout beds with abnormally low resistance, which according to the GI data
were previously defined as water-saturated beds, are explored.
Analysis
of the time-domain measurements by impulse neutron-neutron logging indicates
that this method of the exploration of payout beds with abnormally low
resistance is geologically efficient enough (50%).
The following
equipment is used for GI in development wells during oil- and gas-field
development and gas reservoirs supervision:
-
bundled software instrument AINK-43 (À²ÍÊ-43 ) aimed at dual impulse
neutron-neutron logging in open and cased boreholes, as well as in the boreholes
of producing well stock equipped with tubing, and primary GI data processing;
- borehole equipment AGDK-42-8GKL
(ÀÃÄÊ-42-8ÃÊË ) aimed at field development and production supervision of oil-,
gas- and gas-condensate fields and gas reservoir operations supervision with
simultaneous registration of eight parameters (gamma-ray log, locator, pressure
gauge thermometer, rate-of-flow meter, Water-Holdup Meter, thermal flow-meter);
- computerized unit ‘KS-2 control’
(ÊÑ-2 êîíòðîëü) aimed at gas fields and reservoirs supervision;
-
geophysical lubricating unit ULG-65Õ35 (ÓËÃ-65Õ35) aimed at GI, perforating and
shooting operations in running oil-, gas- and gas-condensate wells through
tubing at field site and in gas reservoirs.
The system of metrological
control by metrological services ensures receiving of reliable geophysical data
as a result of GI as well as ensures its particular accuracy and precision. All
surface borehole equipment is thoroughly tested in the metrological services
from time to time and after every maintenance operation, and borehole equipment
operational capability is checked in a model borehole.
Highly skilled
specialists of the control-interpretation crew use state-of-the-art computer
technologies and software to supervise quality of geophysical investigations of
the boreholes as well as data processing and interpretation.
PE ‘PGWA’ is consistently carrying out technical re-equipment and improvement of
enterprise technical potential and supplies making the best of conversion
potential of the Ukrainian defence establishment and other enterprises.
Poltava geophysical works administration is willing to collaborate on mutually
beneficial terms with everyone interested in our activities irrespective of
geographical location of operation site.
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