Research on Nitrogen Gas Lift Cleanup in Xingjiang Oilfield

doi:10.11885/j.issn.1674-5086.2014.03.03.02

Abstract

Abstract:

The gas reservoirs in Xingjiang Oilfield bear the following characteristics：great reservoir property differences，clay
swelling ，water sensitivity and solid plugging. After perforation using the conventional strings，the perforating gun strings need
to be replaced by the fracturing strings by killing the well. Repetitively killing the well causes secondary damage of reservoir，
and makes it difficult for the flowback of the fracturing fluid due to the low-pressure-factor of reservoir. Therefore，the integrated
string technology of perforation，fracturing and cleanup was developed. For the long-pocket gas wells without lower production
layer，throw gun perforation technology is recommended. Otherwise，the full size perforation technique is adopted. The internal
and tensile strength of stationary gas lifting barrel can reach 90.00 MPa and 70.00 MPa respectively；the loading capacity of
gas lifting valve bellows can reach 35.00 MPa. The research result not only compensates for the shortages of the conventional
completion strings，but also provides new technological approach to solve problems for similar gas reservoirs in unloading kill
fluid，shortening cleanup time，reducing reservoir damage，etc. This research has high promotional and applicable value.

Key words: perforation, fracturing, flowback, integrated string, nitrogen gas lift

Wang Xiaolei, Yang Hai, Hong Jiangling, Li Yanling. Research on Nitrogen Gas Lift Cleanup in Xingjiang Oilfield[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.03.03.02.

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