Key words: distributed temperature sensing (DTS), transient process, inflow profile, fiber optics.
Distributed temperature sensors have several important advantages. They enable to obtain on-line information about well conditions and the frequency of measurements is greatly higher than traditional PLTs on wireline or coil-tubing. Additionally the price of multisensor PLT in horizontal well with low oil rate is extremely high.
Interpretation methods of such data, which are wide spread in literature, do not allow to realize informative potential of DTS technology completely. Interpretation models that are used contain a lot of input parameters and can’t be considered effective in case of limited volume of data.
The authors conducted mathematic modeling of heat and mass transfer in horizontal well and also realized several DTS measurements in vertical multilayered well. It showed that transient processes during well-start or stop contain information about inflow profile. This information is of high value because it almost doesn’t depend on temperature properties of the rocks and fluid. It can be interpreted using simple express methods. In the author’s opinion the development of such methods and measurements technologies is the matter of nearest future.
