In the heavy oil zone with high content of CO2 and H2S in Tahe Oilfield, a sidetrack tubing downhole of P110S had a typical fracture failure. In order to find out the fracture reasons, this paper combined the downhole tubing service working conditions to test and analyze the pipeline rupture in terms of chemical composition, mechanical properties, and microstructure morphology, and analyzed the energy spectrum characteristic of the corrosion products in the fracture site. It is recognized that the well tubing corrosion is the main reason of the fault. Through the analysis of two kinds of typical corrosion characteristics of the tubing sidetrack, it is recognized that the corrosion and pitting mechanism of the tubing wall is mainly a typical CO2 electrochemical corrosion, and that for the side wall of the groove-like distribution of corrosion and pitting, the corrosion mechanism is electrochemical corrosion and crevice corrosion in the condition of the acid with low pH. Targeted prevention measures are also proposed for pipeline corrosion perforation on typical corrosion issues.
ZHANG Zhihong
,
ZHANG Jiangjiang
,
GAO Qiuying
,
SUN Haijiao
,
XIAO Wenwen
. Analysis of Rupture Failure of Sidetrack Deep Well Pipe in Tahe Oilfield[J]. Science & Technology Review, 2014
, 32(7)
: 62
-66
.
DOI: 10.3981/j.issn.1000-7857.2014.07.009
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