Abstract
Abstract
For a significant operator in the offshore Middle East, performing a production logging operation before an acid stimulation, either on an oil producer or a water injector well, is a common practice. Access to this data just before the intervention is critical to optimize the treatment and even to define the need for acid stimulation. The production logging tool (PLT) can be run with wireline (WL) or coiled tubing (CT) units; in both cases, the footprint gets increased due to the need for the WL unit and the increased time and cost due to the additional PLT runs.
Knowing all these factors makes the use of Distributed Temperature Sensing (DTS) for water injector wells cost-efficient since the operation can be done with only one CT reel without the need for WL unit and PLT tools. In fact, the injectivity profile can be done with just an Inconel-encapsulated fiber optic installed inside the CT string; this configuration allows to pump acid treatments with a single CT string reducing the footprint and rig-up/rig-down times of WL unit and swap between conventional and e-coil reels. However, the technology and methodology have yet to be proven in-house to be included as a common practice and replace the PLT operation pre & post-acid stimulation until this case study was conducted. This paper will review a first-in-the-region case study for an offshore water injector CT acid stimulation operation performed using DTS Technology to replace PLT logging, which introduced noticeable optimization to the acid stimulation operations. The paper will also quantitatively evaluate the performance optimizations that emanated from this new technology application.