A WAX INHIBITION SOLUTION TO PROBLEMATIC FIELDS: A CHEMICAL REMEDIATION PROCESS

Abstract

Wax crystallization and deposition during production can lead to severe pipeline and flow line restrictions. Over time, the build-up of wax will reduce the internal diameter and eventually block the line or well. Remediation is normally performed by mechanical pigging or through solvent washes or hot oiling. All have their advantages and limitations. Wax inhibitors/dispersants and anti-sticking agents are an effective solution to remediate the deposition problem. These chemicals can act as either crystal modifiers, or products that reduce the rate of wax build-up on pipe walls. A novel and generic wax dispersant and anti-sticking agent has been developed and tested, which has proven to be effective at retarding the deposition mechanism significantly. The chemical is a synergistic blend of ionic surfactants, which has an ability to absorb onto bare surfaces of tubings and equipment making them oleophobic. The unique properties of the chemical in preventing waxes from adhering to surfaces and success of the experimental findings will be described. Interactions of the product with wax crystal shape and size will be presented, and interference with other chemical additives will be addressed. Preliminary results suggest that an eight times reduction in wax deposition can potentially be achieved.

ACKNOWLDEGMENTS

The authors wish to thank Dr W.H. Breuer & Dr C.P. Herold, Cognis—Germany for technical support and performing experimental studies. Additional thanks go to Technical University of Denmark, Deptartment of Chemical Engineering.

Notes

^*Gas condensate