Selective Acid Stimulation Using Two Different New Technologies-Case Histories from a Saudi Arabian Oil Field

摘要

Carbonate acidizing is very common in the oil industry. In the case of mature heterogeneous reservoirs with different permeabilities and high water cut, stimulation in these reservoirs can be a real challenge. Major technology developments in well stimulation over the last few years are evident in numerous publications. Two new technologies currently in the spotlight were applied in a matured Saudi Arabian oil field. This paper addresses case studies of selective stimulation using a fiber optic enabled coiled tubing (FOECT) system combined with smart chemicals where real-time distributed temperature sensing technology facilitated instant decision process of temporary zonal isolation, fluid placement and treatment efficiency evaluation. The paper also describes another acid stimulation technology used in the same matured field where the completion is equipped with a multistage stimulation completion designed to selectively treat different reservoir sections using a ball drop mechanism. Candidate selection, treatment design, execution, and post job evaluation for both the technologies will be discussed in the paper. Lessons learned and experience gained to optimize similar future jobs will be included in this paper.