The research and application of coiled tubing technology of horizontal well in drainage gas recovery

Abstract

The Su 75 block is a typical low-permeability, low-pressure and low-abundance gas field, 89.6 percent of the gas wells are water-bearing, so it makes the drainage gas recovery become vital means for sustainable development. Recently, the main drainage gas recoveries are the foam drainage gas recovery, plunger drainage gas recovery, compressor/nitrogen gas lift and so on. These measures do not work in all water-bearing gas wells, especially for horizontal wells of big-size production string and gas wells of low entrainment capability. Based on the characteristics of drainage gas recovery and the applicable condition analysis, drainage gas recovery technology of downhole small diameter tubing of the horizontal wells without well killing is put forward. The feasibility was analyzed theoretically, and field experiment was carried out with remarkable effect.