TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractSeveral sandstone fields were recently developed in Saudi Arabia. Various treatments were performed on damaged water injection wells in these fields, however, the performance of treated wells declined over a period of a few months such that these wells required re-acidizing treatments.A thorough investigation was undertaken to identify the damaging mechanism, recommend suitable acid formulae, assess the effectiveness of the treatment in the field and identify methods to minimize well damage.Laboratory and field investigations were conducted simultaneously to address formation damage and associated problems. These investigations included determining rock mineralogy, coreflood tests to screen various acid formulae, and collecting field samples to identify the damaging mechanism.Based on the results of these studies, two acid formulae were selected and applied in the field. More than forty damaged wells were treated with these acid formulae. Because of the low reservoir pressure, these treatments were conducted using a coiled tubing unit and the spent acid was lifted using nitrogen gas. Chemical analysis of acid returns (spent acid) was used to determine the type and concentration of acid additives.As a result of this study the success rate of acidizing jobs in these fields has increased to more than 85%. The target injection rate was met without drilling additional wells. No secondary precipitation was noted after the treatments. In addition, damage prevention procedures, which were implemented in the field, have resulted in a significant reduction in the frequency of performing acid jobs in these fields. This paper describes laboratory and fieldwork done to enhance the performance of damaged wells. Furthermore, it discusses the application of various damage prevention procedures in the field. would like to thank Mr. H.A. Al-Anazi for his work on the second stimulation treatment of Well G-40. SI Metric ConversionFactors ft x 3.048 E-1 = m ºF (ºF -32)/1.8 = ºC Gal x 3.785 412 E-03 = m 3 in. x 2.54 E+00 = cm md x 9.869 233 E-04 = µm 2
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