Syms, M.C.; Syms, P.H. 1981 Water flow and temperature logs from wells in the Ngawha, Kawerau and Tauhara geothermal fields, 1979. : . Report / Geophysics Division 175 77 p
Abstract: During the development of a flowrate and temperature measuring system for use in geothermal wells, described in Syms (1980), many wells were investigated. The results were, at times, incomplete because problems were encountered with the logging equipment, but despite this much useful information has been gained about the temperature, flow, and hole diameter variations of these wells. This report deals with the investigations made during 1979 in wells of the Ngawha, Kawerau and Tauhara geothermal fields, but not those at Wairakei or Broadlands. Ngawha 4 has several permeable zones, with one at 745 m showing particularly high permeability. Ngawha 9 has three permeable levels. Tauhara Monitor 5 is a shallow hole which intersects one permeable zone. Kawerau 19, which is at present producing, was investigated after a workover and found to have one permeable level. Kawerau 27 and 28 are both new wells which, after recovering from drilling, attained temperatures of about 260 deg. C. Both wells contained several permeable levels; in well 27 nine distinct zones were located. Vertical convection cells, where water flowed in one direction inside a slotted liner and in the other between the liner and the bore wall, were identified in Kawerau 19, 27 and 28 at times
