STUDY AND APPLICATION OF THE TRANSIENT WELLBORE TEMPERATURE FIELDS

based on the axially symmetric heat conduction model in the closed-cycle process of hot-water,this paper studies the changing law of wellbore temperature fields with the time in the different working porameters applying the finite element method,analyses the influence on the wellbore temperature fields of abnormal conditions such as stop production,stop injection and stop cycle of hot-water,presents the computation formula of the warm up time before starting production,and of the removal time of condensated deposit in tubing,and develops the computer program.This program Can meet the need of changeable time step-length,and considers the effects of downhole fluids and underground temperature gradient.It can plot the curves of wellbore temperature fields.The fitting results with the measured temperature fields curves of 3 wells as well as the calculation of warm-up time and removal time of more than 60 wells in Zhang-1 Block indicate that the computation model is reasonable and reliable.So far this technology has been used extensively in Liaohe oilfield.