Packer tests are carried out to determine the hydrogeological properties of the ground. This knowledge can often be essential to the proper hydrogeological design. Reference of the test is BS 5930:1999.
The packer (Lugeon) test gives a measure of the acceptance by in-situ rock of water under pressure. In essence, it comprises the measurement of the volume of water that can escape from an uncased section of borehole in a given time under a given pressure. Flow is confined between known depths by means of packers. The flow is confined between two packers in the double packer test, or between one packer and the bottom of the borehole in the single packer test.
A test cycle comprises the measurement of water acceptance of 10 minutes duration for each of 5 values of pressure (2atm, 4atm, 6atm, 8atm, 10atm, 8atm, 6atm, 4atm, 2atm) increment measured at the bottom of the test section using down-hole transducers.
During the testing the details of time, test zone pressure, water meter readings, water loss, leakage rate, sealing properties of the test section and all relevant information are recorded. The results of the test are presented graphically (as S(lt/m.min) vs Pr(atm)).