EXPERIMENTAL STUDY ON MECHANISMS OF HYDRAULIC SAND BLASTING PERFORATION FOR IMPROVEMENT OF OIL PRODUCTION

On the basis of erosion wear theory of materials and the abrasive water jet cutting process, the mechanisms of both casing cutting and formation rock cutting with hydraulic sand blasting perforation of oil wells are discussed, and the influencing parameters are investigated. The preliminary experiments of hydraulic sand blasting perforation both in laboratory and on field are conducted. The simulation experiment in laboratory shows that the casing can be easily cut with the hydraulic sand blasting perforation. The sandstone can be perforated, and a hole with 30 mm in diameter and 780 mm in depth can be made on the sandstone at jetting pressure of 23～24 MPa. The field tests show the promising potential enhancement of oil production with the technique. The improvement of oil production with hydraulic sand blasting perforation is mainly resulted from the removement of the near well bore pollution, looseness of the compacted zone, increase of the formation permeability, which extends the passage way of oil flow.