Water Management - Increased Recovery from Mature Fields

Welltec services offer enhanced production from young as well as mature fields. Expanding the life of a mature well understandably increases productivity and recoverable reserves. Welltec excels in stimulating wells, isolating and reducing water rates while also reducing GOR (Gas to Oil Ratio) as illustrated in the case below. 
 

Isolating Sliding Side Door

A well in the North Sea producing since 1995 was isolated with tubing including 2 sliding side doors (SSD) to control production. Attempts had been made to close both SSDs in 2003, but only the upper SSD had managed to close. A two-piece straddle was sat above the lower SSD, which however did not change production. A PLT test showed there was an internal leakage in tubing. In 2006, the straddle was retrieved and the well temporarily plugged.
 
Eager to get production flowing, the operator decided to apply Well Tractor Technology. The Well Tractor and Well Stroker were used to isolate lower sliding side door with a 72 ft long straddle and to isolate hole in tubing above lower straddle with 26 ft straddle. The results of the job were impressive. Water cut was reduced from 85% to 5%, gas to oil ratio was decreased from 2000 to 200, and Q oil was boosted from 100 to 900 Sm3/d. 
 

Well Parameters

Technology used:  Well Tractor and Well Stroker
Depth:                 12,300 – 12,400 ft
Deviation:            68°
Temperature:       194° F