The Water Corporation of Western Australia has historically spent several hundreds of hours per deep well, performing clean-up operations. Bringing a new well on-line is an expensive proposition and the need to ensure optimal performance is critical.
This case study presents a practical approach using new technologies, workflows & methods that reduced production impairment and verified success which were conducted on a large multi-well MAR project in Perth, Western Australia
The practical approach used ;
• A Novel Drilling fluid designed to protect near-well bore and stress-cage the well.
• Design of an acid soluble drilling fluid system which could be broken down and pumped out during well development; and
• Development of acceptance criteria to verify a clean well. The comparison of flow logging and cumulative BMR derived transmissivity allows;
1. Verify synthetic flow log against actual, therefore quantifying clean up performance metrics.
2. Identification of impaired production zones for further targeted clean–up where deviation of two sets of the data occurs.
This case study demonstrates the successful implementation of an integrated approach to well clean-up using several scales of permeability data from core to wireline BMR to well test.
This case study demonstrates that, in this particular setting, the use of the presented methodology was cost effective, yielded positive confirmation of asset delivery, and has led to a 90% reduction in clean-up associated time.