2010, Volume 12, Issue 10
Strategic Study of CAE >> 2010, Volume 12, Issue 10
The influence of Wenchuan Earthquake on Puguang Gas Field development
1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;
2. Exploration and Production Dept. SINOPEC, Beijing 100728, China
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Abstract
Well casings of Puguang Gas Field took place abnormal deformation before and after Wenchuan Earthquake, but the conventional theory was unable to explain it. By seismicity and seismic load analysis, it was concluded that Wenchuan Earthquake was an important factor to the deformation. Seismic load caused static stress change,dynamic load, fault slip, inconsistent deformation between stratums, salt/gypsum creep speedup and casing deformation. The analysis showed that not only the stress size affected the deformation, but also the stress change imposed important influence. Drilling in seismic area should pay attention to the effect of structural stress change.
Keywords
earthquake load ; oilfield production ; Wenchuan Earthquake ; Puguang Gas Field ; well casing deformation ; mechanism
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