The newly re-designed DCMS Downhole Corrosion Monitoring System provides continuous corrosion history of downhole tubing. The DCMS™ tool is another RCS innovation, and the only tool available which provides recorded corrosion and temperature data for the hostile conditions of downhole operation. The sensitivity of the system enables the film persistence of inhibitors to be evaluated in actual operating conditions, something that was not possible prior to the development of the DCMS™.
The DCMS™ tool may be attached to a variety of wireline approved running tools for insertion into the production well at the start of testing and retrieval from the well at the end of the testing period. The DCMS™ tool can be set at any required depth — wherever the most critical corrosion regions are located. Several DCMS™ tools may be run simultaneously in a well, in order to obtain corrosion data for the different depths, while under the same operating conditions.
The DCMS™ tool is comprised of a CORROSOMETER® probe, an electronic memory module and a battery pack. The body of the DCMS™ tool is a 17-4 PH stainless steel body treated to satisfy NACE MR0175 requirements. The body has a 1.25" OD with a 5/8" sucker rod connection for attachment to the wireline-run tubing hanger or lock. The design of the tool permits operation up to 10,000 psi and 302 ° F (150°C). The electronic module is powered by a lithium battery pack that will provide more than 90 days of data, when programmed to read once every two hours. Even if the tool is left in the well beyond the battery life, the non-volatile memory protects the recorded data. The probe sampling interval of 1 hr., 2 hrs., or 4 hrs. may be selected as required to fit within the 1,024 reading storage capacity for the run time in the well. The probe measurement element, which is usually made of carbon steel, is electrically isolated from the DCMS™ tool body, to prevent galvanic action between the probe body and the probe element.
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