The UNG type gas booster injection units

The UNG gas booster injection unit is designed to carry out in-well and in- tubing operations using gas, which is inflammable and safe in hydrocarbon environment including such operations as:

• well development after drilling and workover
• pressure testing of pipelines including trunk pipelines with inert gas
• conducting geophysical researches or casings pressure testing
• lowering of liquid level in wells for the purpose of fluid influx stimulation and production intensification
• well cleanup from sand and free propane after hydraulic fracturing of the formation (HFF)
• tailing-in and casing cementing using liquid-gas mixtures including foams
• aeration and gassing of cleansing fluids during well drilling and workover
• injection and pumping out of fluids and liquid-gas mixtures.

The UNG unit consists of the following compression stages:

• the first stage is a screw compressor “Storm” manufactured by Borets that is driven by a deck engine model D-245 providing compression of the ambient air up to 174-218 psi (1.2-1.5 MPa)
• the second stage is a gas booster pump that additionally compresses explosion proof gas after the gas generator or uses gas from an external source.

There is safety gas generation system between the stages in which diesel fuel is mixed with compressed air and then the mixture is burnt out. Safety inert gas is a product of combustion of this mixture.

Performance specifications of UNG units

Advantages of the UNG gas booster injection unit:

• low power consumption
• multifunctional operation: all UNG units can inject gas, gassy fluid or foam depending on requirements
• generality on operating environment: the UNG unit can work on its own source of inert gas or from an   external source with the supply of gas or liquid-gas mixture and foam. The UNG units can be used not only  for producing and pumping in of inert mixtures but also as gas pumping units fr during repairs of main gas   pipelines
• wide capabilities to adjust the capacity of the unit in different operating modes
• compact size
• high cross-country capability (the unit can be mounted on a four wheel drive chassis of an “Ural” (wheel   arrangement 6õ6 or 8õ8) or “KAMAZ” (wheel arrangement 6õ6)
• reliable work in different climatic conditions - from the Arctic to the Kazakhstan prairies
• safety in operation: UNG has been certified by the State Technical Inspection of the Russian Federation and   has the Certificate of Conformity and Permit for operation.

The UNGA type nitrogen diaphragm gas booster injection units

The nitrogen diaphragm gas booster injection unit type UNGA is designed to carry out in-well and in-tubing operations using compressed nitrogen or other gas, which is inflammable and safe in hydrocarbon environments including such operations as:

• test of parts of main gas pipelines with gas from existing strings and other pipe-lines using air, nitrogen or gas
• well development after drilling and workover
• pressure testing of pipelines including main pipelines with inert gas
• conduct geophysical research or casing pressure testing
• well cleanup from sand and free proppant after hydraulic fracturing of the formation (HFF)
• aeration and gassing of cleansing fluids during well drilling and workover
• removal of moisture from gas wells.

The UNGA unit supplies only nitrogen and consists of two compression stages - a gas distribution module (diaphragm type device) and a compressed air preparation system. The first stage
consists of Borets screw compressor type “Storm”. The second stage consists of booster system designed by Borets.

The main advantage of the UNGA unit is the utilization of a reliable system of compressed air preparation before the diaphragm device. This preparation system consists of an adsorption dryer and a secondary filtration system for oil retention. The design of the processing system prevents rupture of diaphragms at below zero ambient temperatures.
All nitrogen diaphragm units have the capability to adjust capacity by changing the rotation speed of the drive mechanisms.

Using the nitrogen diaphragm units it is possible to manufacture nitrogen diaphragm systems capable to provide supply of nitrogen or various inactive gases from an external source, liquid-gas mixture or foam for performing of any in-well and in-tubing operations.

Performance specifications of UNG units