每年出版 12 期
ISSN 打印: 1091-028X
ISSN 在线: 1934-0508
IF:
2.3
5-Year IF:
1.7
Immediacy Index:
1
Eigenfactor:
0.00067
JCI:
0.47
SJR:
0.282
SNIP:
0.632
CiteScore™::
3
H-Index:
42
Indexed in
FRACTURING FLUID LEAKOFF BEHAVIOR IN NATURAL FRACTURES: EFFECTS OF FLUID RHEOLOGY, NATURAL FRACTURE DEFORMABILITY, AND HYDRAULIC FRACTURE PROPAGATION
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摘要
This study developed a coupled model for the fracturing fluid loss into natural fractures during a hydraulic fracturing treatment. The model considers a non-Newtonian fracturing fluid, the influence of hydraulic fracture, and the fluid exchange between hydraulic and natural fractures. A semianalytical solution is proposed to solve the coupled model, which demonstrates reliable results through validation study. Parametric studies indicate that increasing the fracturing fluid viscosity can effectively reduce its leakoff at a low viscosity level. While at a high level, further enlarging fluid viscosity may not lead to better control of leakoff. In addition, larger deformability of reservoir rock leads to a faster pressure diffusion and a greater fluid leakoff. Also, the pressure profile inside a fracture takes a concave shape when the deformation of a natural fracture is considered. Moreover, it is found that when a large number of natural fractures open at the same time, fluid leakoff can cause an immediate reduction in the hydraulic fracture width and even screen-out. Therefore, to reduce the operation risks of hydraulic fracturing, the pump rate and fluid rheology must be carefully designed based on the properties of natural fractures in reservoirs.
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