Abstract:
With current demand for gas at historic peak, any decrease in production due to deposits of scale within tubing is the most troublesome for any E&P company. Statistically 28% of time it is the scale in well that hinders producing it at optimum rate. \"Carbonate\" and Sulfate scales are most common of mineral scales that firm in wells. Carbonate scales are generally tackled by wellbore cleanout with acid or by using scale inhibitors to slowdown scale deposition process but none of these solutions solve the problem on permanent basis. Sulfates scales are generally very hard to remove through acid fob and usually chemical chelants are used to control sulfate scales. The major production enhancement challenge fined in well ‘X was to permanently mitigate severe scale build up issue in tubing Job optimum production performance. This paper presents how these challenges were faced and overcome by using Clear WELL unit, resulting in stable and continuous production. A scale study was conducted by OMV laboratory in Vienna to identify the scale build up mechanism and solutions for its mitigation. The study confirmed that minor pressure decrease at formation temperature promoted water transfer into the gas phase, if water rate is low compared to gas rate, this can result ill complete evaporation and formation of precipitate leading to scale build up (mainly calcite). To reinstate production, repeated wellbore cleanouts with coiled tubing using diluted HCI (7.50%) were thought to be the temporary solution infighting CaCO3 scales. Clear WELL unit was commissioned at well ‘X x-mas tree, which is currently under pilot testing. It is till electromagnetic device which continuously generates electronic dipole that induces a randomly varying high frequency electric fold throughout the entire piping system. the electric field generated by device forces homogeneous crystal formation in suspension rather than on metal surfaces. Scale crystallizes in suspension and is carried away with gas water mixture During last 5 months of its pilot testing, results achieved so far are promising. Stable and no lost production added a reasonable value to the producing asset and saved huge revenue loss to the company:
Page(s):
425-437
DOI:
DOI not available
Published:
Journal: Proceedings SPE-PAPG Annual Technical Conference, Volume: 0, Issue: 0, Year: 2011