Abstract

It is commonly seen that water accumulation and near wellbore damage leads to the loss of production. This phenomenon had also been observed in many gas fields in Germany. Five years ago foam & scale inhibitor batch (FSIB) technique was applied but it remained successful only in few fields as only fluid pumping with chemicals was the part of this technique.

Foam & scale inhibitor squeeze (FSIS), a novel technique was developed that involves natural gas pumping along with chemicals. It has been done by using high pressure mobile natural gas compressor. This technique is based on several steps during which foam water as based along with additives (like scale inhibitors, chelating agent etc.) comingled with natural gas are being pumped in the well. In final step compressed natural gas is also bullheaded to displace the pumped chemicals in to the formation.

FSIS has been successfully applied to bring water flooded and damage wells (with no production) back to production. Many targets can be achieved in one job by applying this technique like: removal of water in near wellbore region, cleaning from scales, well kick-off to production in quick time after treatment (due to comingled and displaced gas and reduced hydrostatic pressure), less down time, economy and no effect of produced gas quality.

This report would elaborate the difference between the two techniques Foam & scale inhibitor Batch (FSIB) and Foam & scale inhibitor squeeze (FSIS). Job procedure and benefits associated with these techniques will also be presented along field results.

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