 | | Mechanics of Solids
A Journal of Russian Academy of Sciences | | Founded
in January 1966
Issued 6 times a year
Print ISSN 0025-6544
Online ISSN 1934-7936 |
Archive of Issues
| Total articles in the database: | | 12804 |
| In Russian (Èçâ. ÐÀÍ. ÌÒÒ): | | 8044
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| In English (Mech. Solids): | | 4760 |
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| T.M. Bondarenko, B. Hou, M. Chen, and L. Yan, "Laboratory Research of Fracture Geometry in Multistage HFF in Triaxial State," Mech. Solids. 52 (3), 289-298 (2017) |
| Year |
2017 |
Volume |
52 |
Number |
3 |
Pages |
289-298 |
| DOI |
10.3103/S0025654417030062 |
| Title |
Laboratory Research of Fracture Geometry in Multistage HFF in Triaxial State |
| Author(s) |
T.M. Bondarenko (State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum-Beijing, Fuxue Road 18, Changping, Beijing, 102249 China, tbondarenko91@mail.ru)
B. Hou (State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum-Beijing, Fuxue Road 18, Changping, Beijing, 102249 China)
M. Chen (State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum-Beijing, Fuxue Road 18, Changping, Beijing, 102249 China)
L. Yan (State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum-Beijing, Fuxue Road 18, Changping, Beijing, 102249 China) |
| Abstract |
Multistage hydraulic fracturing of formation (HFF) in wells with horizontal completion is an efficient method for intensifying oil extraction which, as a rule, is used to develop nontraditional collectors. It is assumed that the complicated character of HFF fractures significantly influences the fracture geometry in the rock matrix. Numerous theoretical models proposed to predict the fracture geometry and the character of interaction of mechanical stresses in the multistage HFF have not been proved experimentally. In this paper, we present the results of laboratory modeling of the multistage HFF performed on a contemporary laboratory-scale plant in the triaxial stress state by using a gel-solution as the HFF agent. As a result of the experiment, a fracturing pattern was formed in the cubic specimen of the model material. The laboratory results showed that a nearly plane fracture is formed at the first HFF stage, while a concave fracture is formed at the second HFF stage. The interaction of the stress fields created by the two principal HFF fractures results in the growth of secondary fractures whose directions turned out to be parallel to the modeled well bore. But this stress interference leads to a decrease in the width of the second principal fracture. It is was discovered that the penny-shaped fracture model is more appropriate for predicting the geometry of HFF fractures in horizontal wells than the two-dimensional models of fracture propagation (PKN model, KGD model). A computational experiment based on the boundary element method was carried out to obtain the qualitative description of the multistage HFF processes. As a result, a mechanical model of fracture propagation was constructed, which was used to obtain the mechanical stress field (the stress contrast) and the fracture opening angle distribution over fracture length and fracture orientation direction. The conclusions made in the laboratory modeling of the multistage HFF technology agree well with the conclusions made in the computational experiment. Special attention must be paid to the design of the HFF stage spacing density in the implementation of the multistage HFF in wells with horizontal completion. |
| Keywords |
HFF fracture, horizontal well, fracture geometry, HFF stage spacing density |
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|
| Received |
02 February 2015 |
| Link to Fulltext |
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