The use of hydrajetting for perforating wells has been common since the sixties. During those early years, wells were relatively shallow and jetting success was consistently demonstrated. However, as wells were drilled to depths where rock formations were harder, performance of hydrajetting became less dependable because subsequent stimulation failures occurred more often from the lack of fracture initiation.
To help prevent this situation, a series of tests were performed to define new best practices for hydrajet perforating of rock under high ambient pressure. Various rocks were subjected to the tests that were conducted using different jetting pressures and abrasives. To better understand the jetting behavior, the mechanical characteristics (such as Young's Moduli, Poisson's Ratios, and compressive strengths) and chemical structures were also evaluated.
This paper discusses various tests results, and new constraints for jetting are defined and presented.