The Research on Dynamic Changes of Fracture Width in Fractured/Caved Carbonate Reservoirs
To predict the dynamic width of the fracture during drilling in fractured/caved carbonate reservoirs, the physical model and finite element model of mud losses have been established, basing on the condition of fractures or caves and the mechanisms of lost circulation. How fracture length, cave diameter, overbalance pressure differential and leakoff time effectting fracture width changes are investigated. The results show that the dynamics fracture width increases with the increase of overbalance differential pressure, cave diameter, fracture length and leakoff time, among which the overbalance pressure differential and cave diameter are the most important factors. Fracture has “flat, straight and wide features in high differential pressure, large diameter, short fracture length, and long leakoff time. This increases the difficulty of lost circulation prevention and control and the difficulty of reservoirs protection. Therefore, the lost circulation prevention should be put in the first place, and plugging measures should be executed timely, quickly, and efficiently.
fractnred-caved reservoirs carbonate rock fracture width formation damage lost circulation numerical simulation
LI Daqi KANG Yili
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, P.R.China, 610500
国际会议
成都
英文
268-274
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）