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Oil Field Services

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 Oilfield scale is a major problem in the oil and gas industry once wells start to produce water. The deposition of scale can block the near well bore area, production tubing, valves and chokes and can result in reduced oil production and health and safety issues due to the ineffective operation of the valves and chokes. 

In sub-sea production environments it is crucial for the wells to be protected against scale deposition to maintain healthy oil production and for the downhole safety valve (DHSV) to be fully operational at all times.  To prevent scale from forming in the system, a chemical inhibitor must be injected continuously and/or by periodic batch squeeze treatments. In most cases, scale prevention through chemical inhibition is the preferred method of maintaining well productivity.  Scale inhibitor squeeze treatments provide one of the most common and efficient methods for preventing the formation of carbonate and sulphate scales in the near wellbore and topside facilities of production wells

An essential part of any scale squeeze management strategy for any oilfield is the capability to accurately and precisely determine the residual scale inhibitor concentration in the produced fluids.  This data in combination with ion analysis, suspended solids, well productivity index and functionality of downhole safety valves is essential to determine the lifetime efficiency of scale squeeze treatments.
Vitas possess unique expertise for developing novel methodology for the
determination of various chemicals used in offshore oil production.  A comprehensive set og tools including advanced
mass spectrometry is used to solve a variety of analytical challenges. Typical sample matrices are high salinity
produced water, cooling or heating media or seawater.

Actives like polymeric scale inhibitors (SIs), phosphonates and corrosion inhibitors can be quantified down to sub ppm levels alone or in the presence of similar chemicals. Our methods allow efficient monitoring of low levels of residual scale inhibitor without turning of the topside addition of Sis. The ultra-low detection levels allows for lower Minimum Inhibitor Concentrations ( MIC), postponed re squeezing and thus massive cost savings. The very specific methods also allows monitoring individual Sis from different wells in water from co-mingling streams or tiebacks. 


Emerging 4th Generation Analytical Technology for the Individual Analysis of Multiple Families of Co-mingled Scale Inhibitors in Deepwater Wells(Link)

Society of Petroleum Engineers

Individual Analysis of Mixed Polymeric Scale Inhibitors In Co-mingled Subsea And Deepwater Environments By Mass Spectrometry

NACE International 2012