Nedmag TR-7 workover 2020
Project Description
The initial objective of this workover was to recomplete the well as a simultaneous injection and production well. This would be achieved by retrieving the current dual completion strings, drilling in a new 4-½” x 3-½” production string and a 2-⅞” gypsum injection string in a dual completion configuration.
Due to unforeseen circumstances regarding the condition of the 9 ⅝”, the objective of recompleting the well could not be achieved.
TR-7 was drilled in 1991 and completed with a dual completion, 2x 3 ½” tubing inside a 9 5/8” casing. The snubbing operation was performed in July 2020 and lasted for 39days. The removal of the 3 ½” dual completion went as per plan. However on the mill run, to mill out the remaining tubings in the bottom of the casing an obstruction for the 8 ½”mill above the tubings was found inside the casing. After wireline evaluations the operations were suspended to evaluate the future use of the well.
Challenges
Removal of a dual completion without identification of the complete status of the well. Plan was to recomplete the well with a dual completion, in snubbing mode, however during the drift run it was found that the well could not be re-completed.
New technology: Use of an floating mud cap, inverted fluid column (high weight mud on brine), to remove WH items.
Role of WEP
Engineering and planning support on program and HSE documents. Operational support onsite and back-office
Overview
Client
Nedmag BVLocation
WHC-2 / TripscompagnieWell
TR-7Date
Start drilling: 01 November 2018
End execution: 30 November 2020Objective
The initial objective of this workover was to recomplete the well as a simultaneous injection and production well.Depth
Depth (MD): 1726m
Depth (TVD): 1480m