High Pressure

A lack of data and models for corrosion and scale at extreme temperature (250°C) and pressure (1700 bar) encountered in deepwater development increases the economic, environmental, and human safety risks of production.  The oil and gas industry has spent years understanding scale, corrosion and fluid properties, generally up to about 150°C (302°F) and 7,000 psig to 10,000 psig, with very limited work being done at higher temperature and pressure conditions. Often, the upper limits of testing are related to equipment limitations or safety concerns both of which have been addressed at Tomson Technologies.

 

Tomson Technologies’ preliminary testing suggests that there are new classes of chemicals that do not perform well as inhibitors at conventional temperature and pressure values, but at temperature greater than about 175°C (347°F), they become effective scale inhibitors.  Similarly, at the higher temperature and pressure values many of the scale inhibitors that work well at lower temperature values appear to be limited in effectiveness. Tomson Technologies continuously performs research to systematically discover new classes of scale and corrosion inhibitors.

 

Similarly, for modeling the literature is mostly related to these lower pressure and temperature conditions. Many universally accepted theoretical frameworks such as Peng-Robinson equation of state (EOS) models and Pitzer activity coefficients are reaching their prediction limits and new expanded industry-applied predictive software like ScalePREDICT is needed.

 

Finally, little is known about the rate of scale formation or corrosion in any of these conditions, and virtually nothing is known about the stability and effect of scale and corrosion inhibitors at these regimes. The critical interplay of scale and corrosion inhibitors with specific metallurgies is also unknown and is continuously studied at Tomson Technologies, as this interplay is a key variable in well design, production, and inhibition.

 
Tomson Technologies expertise on HPHT conditions is applicable in many fields such as:

  • Scale prediction and prevention
  • Solubility studies
  • Scale dissolvers
  • Chemical stability
  • Squeeze performance
  • Corrosion
  • Material selection
  • New class of application chemicals

 
Tomson Tech’s in house lab setup can hold pressure of 25,000 psi and over 250°C simultaneously. In house capabilities include inhibitor squeeze research, flow-through apparatus for scale solubility, corrosion and kinetic studies at HPHT. Autoclave electrochemical tests at 3,000 psig and up to 300°C. Intact core flow through experimental setup with variable diameter and length at HPHT and other apparatus.
 

Tomson Technologies performs extensive research and modeling at extreme temperatures and pressures to represent deep-water conditions. Tomson Tech models and experimental work help production companies:

  • Maintain efficient production,
  • Prevent corrosion and scale,
  • Understand pressure and temperature limits for prediction,
  • Extend the range of existing models, and
  • Predict scale and corrosion modeling.
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