The major domestic manufacturers of lined shaped charges available to independents are:
JRC (Halliburton) Owen Titan (Shaped Charge Specialists)
The American Petroleum Institute (API) publishes RP 19B, Recommended Practices for Evaluation of Well Perforators (formerly RP 43), which standard is supposed to give us an impartial and unbiased basis for comparing various perforating products. There were persistent rumors of cheating, but no real proof under the old RP 43 procedures, but RP 19B provides for witnessing among other changes. API now publishes the results of the tests here: API Perforator Tests.| Home | Tech & Tips | Perforating & Explosives |
In shallow stripper well country, we were sold on the old 90 gram "frac" capsule shot (it has gone by several trade names). It was touted as producing a hole almost 0.7 inches in diameter, and almost 19 inches deep (some manufactures claimed a little less). In fact, the charge was more on the order of 65 grams, not 90, and perforation depth figures were undoubtedly exaggerated (no current RP 19B data is available for the 90's). It was also notorious for carrot formation with its solid liner construction. The idea was that you could shoot these monsters in old wells, even open hole completions, and rejuvenate the well. The problem is that the alleged rejuvenation seldom improved production. There is alternative rejuvenation technology which should be considered in such situations.
In recent years, incredible advances have been made in lined shaped charge design. Part of the progress is attributable to computer aided design (CAD). Heck, it was not until the 1970s that modeling codes could even predict with any accuracy how a shaped charge would behave. Premium charges capable of penetrating 36 or even 48 inches are now available. Might these deep penetrating charges be useful for well rejuvenation, perhaps producing new flow paths out beyond near well bore damage? These charges are relatively expensive, hence little field work has been done in this regard. In 1995, we proposed testing this hypothesis as a project to DOE, but their evaluation contractor, BDM-Oklahoma, Inc., was not moved. There are reports of good results in a few newly drilled open hole completions where the only stimulation has been shooting with the new deep penetrating charges.
In general, many of our wireline customers have reported very good luck with the premium deep penetrating charges in conventional applications. Many of their customers are happy to bear the increased cost for what they perceive as a superior completion.
Exercise extreme caution when working with explosives. Stay alert and THINK; complacency kills! Follow the guidelines in the American Petroleum Institute (API) Recommended Practices for Oilfield Explosives Safety, RP 67.