Development and application of a portable pump-in tester while drilling with airbag isolation

Abstract:

In the investigation of water resources and hydroower engineering， the pump-in test is often carried out. In order to improve the efficiency of pump-in test， a portable pump-in tester with airbag isolation was developed， and the tester can be used with wire-line core drill tool. During the testing process， without lifting all drill string out of hole， the portable tester can be quickly lowered down to the hole bottom from the hollow of the wire-line core drill string， and the pump-in test was conducted by using rubber airbag and air-water diversion device. In this paper， the working principle， structure compositions and key techniques of the portable tester are introduced in detail， and the field test is conducted in a hydropower project in Yunnan Province. The field test results show that the tester structure is simple， high reliability， low manufacturing cost， and it can significantly reduce labor intensity， improve production efficiency during the test. Furthermore， it can be made out to ?75mm， ?91mm and other specifications according to the practical application， which solves the challenge of wier-line core drilling technology promoted in water resources and hydropower industry.