Volume fracturing technology of unconventional reservoirs: Connotation, design optimization and implementation
- 作者：Qi WUa ; b ; wooqi@petrochina.com.cn ; Yun XUb ; c ; Xiaoquan WANGa ; Tengfei WANGb ; c ; Shouliang ZHANGa ; b
- 关键词：unconventional reservoirs ; volume fracturing technology ; connotation ; optimization design ; multi-stage and multi-cluster ; &ldquo ; integrated&rdquo ; volume fracturing ; future development direction
- 刊名：Petroleum Exploration and Development
- 出版年：2012
- 期刊代码：P45_18763804
- 类别：ear
- 出版时间：June, 2012
- 卷：39
- 期：3
- 页码：377-384
- 文件大小：483 K
摘要
The connotation, design optimization and implementation of the Volume Fracturing technique are discussed. The connotation includes five aspects as follows: (1) break up reservoirs to form complex fracture network, and 鈥渁rtificial鈥?permeability; (2) the fracture initiation involving not only single open-fracture but shear failure and slip; (3) 鈥渂reakthrough鈥?the traditional fracturing seepage theory model, greatly shorten the effective fluid seepage distance; (4) more suitable for highly brittle formations; and (5) multi-stage and multi-cluster perforation mode to improve well productivity. Research shows that: the time required to seep through matrix with 0.000001 脳 10鈭? 渭m2 permeability to fracture for 100 m distance is about more than 100 脳 104 years, and only Volume Fracturing can realize the 鈥渟hortest distance鈥漵eepage. Cluster spacing optimization, non-uniform stage (cluster) interval and proppant filling mode are the key to achieve Volume Fracturing. Small cluster interval technology, multiple stop-injection construction mode and tip screen-out fracturing technology are the key techniques to realize Volume Fracturing in low brittle formations. Volume fracturing technique has a good application prospect in tight oil (gas), volcanic and carbonate reservoirs, and the further developed 鈥渋ntegrated鈥?volume fracturing (based on multi-layer and multi-branch well technology) is the future development direction for unconventional resources.