Salt producing wells TR-2 & TR-4 HWO
Start execution: January 2015
End execution: February 2015
Result: Two successfully executed well interventions by snubbing
Depth (TVD): From 1905m to 2067m
Project Summary
| Client: | Nedmag |
| Location: | Veendam |
| Wells: | TR-2 & TR-4 |
| Start Execution: | January 2015 |
| End Execution: | February 2015 |
| Target: | Well 1: Retrieving the 4.1/2” dilution string and the 7” x 5” production string as deep as possible and performing wireline measurements.; Well 2: Retrieving a 5” fish and recompleting the well with a 7” x 5” drill-in completion and 4.1/2” dilution string. |
| Result: | Both well interventions were executed successfully. |
| Depths (TVD): | From 1905m to 2067m |
| Role of WEP: | Well Engineering Partners provided project planning, tendering engineering, coordination, management and supervision for the project while other companies provided materials and services. |
| Challenges: | The operations were executed under approximately 90-120bar wellhead pressures. |
Project Description
Well Engineering Partners completed two Hydraulic Workover Snubbing Operations (HWO) for two wells in the period January to February 2015. In the 7 weeks, at the first well the remaining completion was retrieved as deep as possible and at the second well, the production tubing was brought back to the original depth. All was done under approximately 90-120 bar wellhead pressure. All workover operations were carried out with a Hydraulic Workover Unit (HWU) of Balance Point Control.
The scope of the well interventions:
1) Well 1: the 4.1/2” dilution string and the 7” x 5” production string were retrieved as deep as possible and wireline measurements were performed.
2) Well 2: a 5” fish was retrieved and the well was recompleted with a 7” x 5” drill-in completion and 4.1/2” dilution string.
In the first well the 4 ½” dilution string was pulled out of the hole. Then the 7” top part of the casing string was plugged and pulled out of the hole. With a fishing overshot and a mechanical cutter the remaining 7” x 5” fish was cut as deep as possible and retrieved to surface. After the fish was out of the hole detailed wireline surveys were carried out. With a milling assembly, a part of the 5” was milled. The well was suspended by a 7” suspension string.
The HWU moved to the 2nd well. Initially, the 7” suspension string was pulled out of the hole. Then the well was killed with a floating mud cap. After this, a 5” fish was retrieved. Wireline investigations confirmed good well integrity. Then the well was killed again and a 7” x 5” completion with drill-in BHA was run in hole and drilled from 1905 m to 2067m. A wireline real-time tool was used for directional measurements during drilling to monitor the progress. At TD, the tubing was severed just above the BHA with a wireline severing tool to create the new production point.
