PROCESS AND DEVICE FOR CLEANING HOLES CONTAINING VISCOELASTIC IMPURITIES

摘要

PCT No. PCT/DE91/00098 Sec. 371 Date Oct. 14, 1992 Sec. 102(e) Date Oct. 14, 1992 PCT Filed Feb. 7, 1991 PCT Pub. No. WO91/12124 PCT Pub. Date Aug. 22, 1991.The invention relates to a method for the removal of viscoelastic rubber residues from deep holes. The cleaning tool is suggested in the form of a jet of fluid droplets. The fluid is accelerated by a high-pressure pump and a narrow valve to a velocity above the speed of sound of the material to be removed. The distance between the valve and the hole to be cleaned is made greater as the valve cross-section is made smaller in relation to the cross-section of the hole to be cleaned.