workover patch vs casing perforations


Enhanced Oil Recovery

EOR, enhanced oil recovery

EOR (Enhanced Oil Recovery) helps to improve the average recovery factor for typical mature fields around the world up to 30-40%, extending worldwide reserves to a bit more than 50 years supply of oil. The different techniques used, including Water & Gas injection (WAG), polymer flooding, flow diversion, the use of surfactants, and steam injection for heavy oils (both Steal Assisted Gravity drainage – SAGD wells, and cyclic steam injection (CSS wells) will increase the life of a field. Sometimes oil and gas operators need to modify the injection/production profile, to switch from producer to an injector well, having first to cover unwanted perforations with a casing patch.

Isolate Perforations

Saltel Industries offers a remedial alternative to isolate perforations with a thin-walled casing patch. Run with drill-pipe or coiled-tubing, Saltel Patch allows one of the best ID access to the well below (for packers, tubing anchors…) Saltel Xpandable Steel Patch seals effectively and holds significant differential pressures. ratings (See Xpandable Steel Patch for EOR)

Modifying injection profile

Many wells are completed and perforated, in both production and injection wells. During the life of well, the required profile might be reconfigured, as fluid levels vary, and EOR techniques allow modifying downhole parameters. It may be necessary to close off existing perforations, re-perforate in new zones, or change the injection profile. Covering perforations with Xpandable Steel Patch is an optimized EOR technique allowing to eliminate unwanted and expensive water production, to reduce gas production, and to avoid cross-flow (communication between 2 reservoirs). This technology is also suitable when converting a producing well into an injector (or vice-versa).