Significant improvement in production from horizontal, multilateral wells, has been realized through the application of Specific Enzyme Breaker (SEB) technology, for the removal of natural starch polymers used in drilling operations. This new treatment allows the placement of a fluid to remove polymeric mud damage at the cessation of drilling operations for each multi-lateral section, which could not otherwise be re-entered for clean-up and effective stimulation during completion of the well.
This paper includes a study of multi-lateral wells treated with Starch Specific Enzyme Breakers and provides a comparison with offset wells in the same field which have been treated conventionally with acids. The field data presented shows Starch Specific Enzyme Breakers to be effective in degrading filter cake laid down by starch based muds and in removing polymer filtrate damage. Results also show that, compared to wells treated with acid alone, the effects of soaking with a Specific Enzyme Breaker followed by a small acid treatment, will provide significant improvements in overall stimulation performance.
This new treatment provides an effective means of removing mud polymer damage from horizontal and multilateral open hole completions, that would otherwise be left in place by conventional stimulation treatments. The removal of this polymeric damage allows acid treatments to be optimized for the stimulation of the reservoir rather than for removal or by-passing of mud damage.
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