TECHNICAL FIELD

The disclosure generally relates to downhole formation production, and more particularly to downhole acid injection to stimulate formation production.

BACKGROUND

Acid is often used to stimulate formation production. Usually a small-scale test can be performed on a formation to test the viability of acid treatment to improve permeability and/or mobility improvement within the formation. However, even small-scale tests can require significant effort and are usually performed with expensive and specialized tubing equipment and transportation methods. Further, a wireline or drillstem testing (DST) crew may be needed to measure permeability both before and after the acid treatment. Thus, numerous trips can be required to conduct these activities. First, the wireline or DST tester is lowered into a borehole and a formation mobility measurement is taken at a specified depth. Then, the wireline or DST is removed. Next, a coiled tubing is deployed downhole for acid injection at the same location at which the formation mobility measurement was taken. The coil tubing is then withdrawn from the borehole. Finally, the wireline tester or DST can be removed. In addition to deploying and removing numerous tools downhole, the locations of these trips can vary. Therefore, the mobility comparisons may not be accurate due to inconsistencies in measurement and acid injection locations. Thus, the quality of the test may be compromised.

