PROBLEMS OF UNSTABLE WELL OPERATION AT PARLIFT EXTRACTION OF GEOTHERMAL FLUID

Abstract

The paper describes one of the key problems of well operation at steam hydrothermae deposits – instability in parlift extraction of geothermal fluid. The authors have noted the main condition of stable operation of the well, taking into account the modern ideas about the system of mining and transporting the steam-and-water mixture. The paper classifies the types of instability arising from steam-and-water wells operation depending on the nature of the development, scale of manifestation and practical manifestation of this instability. It was determined that the greatest interference for stable extraction of geothermal fluid is the geyser mode and pulsation. The paper has presented the examples of specific wells of domestic deposits and enterprises that have encountered this problem. A dangerous result of instability development is selfkill. The paper has given the result of forced application of the scheme of the system operation system for mining and transporting the geothermal fluid at Pauzhetskoye deposit of steam hydrothermae due to the constantly arising problem of self-kill. The paper has identified the main reasons for impossibility of providing the parlift. The paper has given the short recommendations on the possible way to increase the efficiency of the parlift. The authors have made the conclusions about the need to take into account all factors that have caused the development of instability in the operation of steam-and-water wells, as well as rational selection of the method for rocking the well.