Critical Drawdown Pressure of Depleted Reservoir
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- 作者：Chuanliang Yan (1) (2)
Jingen Deng (1)
Xiangdong Lai (1)
Lianbo Hu (1)
Zijian Chen (1) - 关键词：Pressure depletion ; In ; situ stress ; Sand production ; Critical drawdown pressure ; Rock strength criterion
- 刊名：Indian Geotechnical Journal
- 出版年：2014
- 出版时间：March 2014
- 年：2014
- 卷：44
- 期：1
- 页码：101-106
- 全文大小：250 KB
- 作者单位：Chuanliang Yan (1) (2)
Jingen Deng (1)
Xiangdong Lai (1)
Lianbo Hu (1)
Zijian Chen (1)
1. State Key Lab of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China
2. Faculty of Petroleum Engineering, China University of Petroleum, Fuxue Road 18#, Changping District, Beijing, 102249, China - ISSN：2277-3347
文摘
For long time production, most oilfields have entered the later development stage, and the pore pressure is seriously depleted. The pressure depletion will affect in situ stress, and change the stress state around the borehole, and then the affect the critical drawdown pressure to cause sand production. The theoretical formula of two horizontal in situ stress changes with pore pressure is obtained based on generalized Hoek’s law, and then the stress distribution formula around the borehole in pressure depleted reservoir is established. The calculation model of sand production critical bottom hole flowing pressure in depleted reservoir is established using the Mohr–Coulomb criterion, Drucker–Prager criterion and Mogi–Coulomb criterion, respectively. The influence of pressure depletion on critical drawdown pressure is analyzed. The results show that: with the pore pressure decreasing, the horizontal in situ stress and critical drawdown pressure become smaller; the error of prediction model based on Mogi–Coulomb criterion is the minimum, and it is more in line with the actual field data; the prediction model based on Mohr–Coulomb criterion is conservative but most safe. The establishment of prediction model provides a guidance for actual production decisions in pressure depleted reservoir.