Oilfield Services

The Oilfield Services of PJSC Ukrnafta (hereinafter – the OFS) incorporates all the Company’s oil servicing units.

The OFS is one of the largest Ukrainian companies providing a full range of services for the oil and gas industry:

cementing
hydraulic fracturing
coiled tubing operations
operations support services
tubing production and repair
test and repair of electric submersible pumps
engineering and well testing
blowout response service

The OFS provides services not only to Ukrnafta but also has more than 60 external customers. We provide services and technological solutions for the duration of field development: ranging from drilling, reservoir assessment to well development and production enhancement.

Our network covers more than 30 facilities located in close proximity to Ukraine's largest oil and gas fields to provide efficient and timely provision of customer services.

The OFS’ driving force is a well-trained and highly experienced personnel and a strong logistical base.

Pressure pumping сementing and acidizing services

The OFS offers the following pressure pumping, cementing and acidizing services:

casing cementing
setting of cement plugs
pressure testing of casing, drilling tools, manifolds, tubing, BOP equipment
borehole cleanout
acid stimulation operations
bottom hole zones treatment
special treatment with salt inhibitors, corrosion, bactericides, special paraffin solvents, etc.
wax prevention and removal
cleanout of sand plugs
isolation of formation water inflows
well killing procedures
transportation of cement
coiled tubing operations
well stimulation with compressor units, cryogenic nitrogen unit, liquid nitrogen
acid fracking
slurry design
coiled tubing jobs

Today, the OFS cementing facilities include 107 cementing pumping units, 2 coiled tubing units, pumping fleet, 4 nitrogen and air compressors, 3 air compression units and 3 nitrogen units.

Since 2017, the OFS has performed 101 operations on casing cementing, set 290 cementing plugs, carried out 191 coiled tubing operations and 37 hydraulic fracturing operations.

Pressure pumping сementing and acidizing services

Hydraulic Fracturing

The OFS performs hydraulic fracturing (fracking) turnkey, namely:

selection of objects for fracking
optimal design of hydraulic fracturing using the latest specialized MFrac Suite 12 software by Baker Hughes a GE Company
engineering and scientific support for preparation of fracturing additives at the well:

water testing
preparation of dispersing medium
linear gel (homogeneous biodegradable system with qualitative structural-rheological, pseudoplastic, technological features and excellent inhibitory properties)

mini-hydraulic fracture tests and hydraulic fracturing in compliance with the design parameters, well testing etc.
hydraulic fracturing operations under Fly Ash Frac technology using bottom ash materials from Ukrainian thermal power plants as a crack filler

The OFS team of PJSC Ukrnafta has an extensive experience in the above-mentioned operations. Since 1996, we have performed more than 440 hydraulic fracturing operations with fracture being fixed in various subsurface properties of the Western and Eastern Oil and Gas Production Regions.

In September 2019, for the first time ever, the OFS successfully carried out a hydraulic fracturing of Eocene sediments of well 85 Strutyn of Dolyna NGVU with fracture being fixed using record-breaking 42 t of the propping agent.

At the end of 2020, the OFS was the first company in Ukraine to apply an alternative Fly Ash Frac technology in hydraulic fracturing with the use of bottom (dry) ash from Ukrainian TPPs and fine frac sands in injection well 241-Dolinska. The results made it possible to increase the well injectivity by 60% in average.

Well Testing

well testing operations
advanced slickline operations
gas-condensate well test analysis
PVT analysis for oil reservoirs
pressure transient analysis using industry standard software KAPPA NET SAPHIR NL

Production services

Production services produce:

tubing
sucker rods
equipment for oilfield arrangements
spare parts for drilling and oilfield equipment
metal structures
rope cargo slings and separate elements for it, lifting beams
tools and equipment for workover
rubber products (made from crude rubber, by vulcanizing in molds)
forgings up to 100 kg

Our bases also offer:

major and routine overhaul of electric motors, generators, power transformers of all types and modifications
repair tubing, drill pipe, heavy weight drill pipe, cross-over subs, etc.
repair of drilling and oilfield equipment of domestic and foreign origin

Electric Submersible Pumps Repair

In 2020, the OFS completed the construction of a modern workshop for repairing electric submersible pumps (ESP) within the Operations Base Pryluky, where now all types of ESP repairs are carried out regardless of their manufacturers, namely:

Receipt control of new equipment and computerized inspection report on:

ESP sections
common sized submersible electric motors (SEM)
common sized seal sections
telemetry systems
electrical submersible cable (ESP cable)
cable extensions
check and drain valves

Repairs (maintenance, medium and major) of:

ESP sections
common sized SEMs
common sized seal sections
electrical submersible cable (ESP cable)
cable extensions
check and drain valves

Testing and after-repair computerized inspection report on:

ESP sections
common sized SEMs
common sized seal sections
telemetry systems
electrical submersible cable (ESP cable)
cable extensions
check and drain valves

Blowout Response Service

preventive inspections of facilities for compliance with blowout response requirements
response to oil and gas blowouts
response to oil and gas showings and related complications
complex emergency repairs in gas explosive environment:

under-pressure running and pulling of pipes
replacement of wellhead valves without killing a well
leakage elimination in wellhead flanged connections
pulling out of hole pipes plugged with sands, hydrates, wax

inspection, repair and pressure test of BOP equipment
installation of BOP equipment
tanks clean-out of bottom sediments
design and production of blowout prevention and response equipment, including:

spools
adaptors
tubing head adaptors
sealing parts (well head strippers, pumping rod sealers, rotating control devices)