TABLE OF CONTENTS One can take the conventional sandstone acidizing procedures, remove or insert a step, and call a procedure novel or unconventional. However, genuine advancements have been achieved through unconventional methods introduced to the industry by creative, reasonable risk-taking, stimulation design engineers. Examples of such interesting methods are presented in this chapter. Some include the following:
Maximum-rate/maximum-pressure HF treatment [1]
CO 2-enhanced HF treatment [2]
High-concentration HF treatment
Single-stage HF treatment [3]
On-the-fly minimum-volume HF treatment [4]
Geothermal (steam) well acidizing [5]
These methods are for special situations and applications.
[1]Paccaloni, G., and M. Tambini. 1993. Advances in matrix stimulation technology. Journal of Petroleum Technology. March: 256. Paccaloni, G., M. Tambini, and M. Galoppini. 1988. Key factors for enhanced results of matrix stimulation treatments. Paper SPE 17154, presented at the Society of Petroleum Engineers Formation Damage Control Symposium, Bakersfield, CA. Paccaloni, G. 1995. A new, effective matrix stimulation diversion technique. SPE Production and Facilities. August: 151-156.
[2]Gidley, J., E. Brezovec, and G. King. 1993. An improved method for acidizing oil wells in sandstone formations. Paper SPE 26580, presented at the Society of Petroleum Engineers 68th Annual Technical Conference, Houston. Gidley, J. L. 1985. Acidizing sandstone formations: A detailed examination of recent experience. Paper SPE 14164, presented at the Society of Petroleum Engineers 60th Annual Technical Conference and Exhibition, Las Vegas, N V.
[3]Rae, P., and G. di Lullo. 2007. Single step matrix acidising with HF: Eliminating preflushes simplifies the process, improves the results. Paper SPE...
