| Abstract |
The candidate wells evaluated were those wells with obserued underperformance based on their output decline over time, namely, 110D, 111D, 2R3D, 2R4D, 301D, 306D, 401, 416D, MGIBD, and MG23D. Ihese wells were initially prescreened on the basis of their output trends and historical workover and blockage/break information so that only those wells that necessit ate a descaling workover will be finally considered for the rubric analys,s. The rubric analysis translatesa // the available well data quantitativelyb y giving high scores to those wells more prioritized for a descaling workover. The rubric analysis is a prioritization method that quantifies the following elements present to each well evaluated current and baseline output, gain and recoverable output, age, workover/acidizingd ata, and the attendanceof shallowest scale/break After the evaluation conducted in June 2005, prioritizationo f candidate wells for workover followed fhis order: 416D, MGIBD, 110D and 2R3D. Wells 401, MG23D and MG37D were likewise evaluated to fesf whether they will pass the rubric despite the lacUabsence of signatures establishing the need for a descaling workover. Ihese wells earned the lowest scores suggesting that the rubric evaluation does nof support the need for a descaling workover on fhese wells. The results of the rubric evaluation were validated by the amount of projected recoverable output, taking into account the normal reservoir drawdown. For fhose wells which had already underwent workover as of fhis writing, fhese were further validated by comparing the projected output recovery derived from the evaluation conducted, with the actual posfworkover output of the wells. Far instance, the result of the rubric analysis is validated with the actual gain in output of 4.6 MWe (as againsf 3.4 MWe projected output gain) in well MG18D after the acidizing activity, and in well 416D with actual output gain of 6.0 MWe (as against 6.5 MWe projected output gain) after the descaling workover. This indicates fhe usefulness of the evaluation procedure in terms of identifying and prioritizing the candidate wells due for descaling worKovera, nd estimatingr ecoverable output. |