Pengcheng Fu, Yue Hao, and Charles R. Carrigan
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1 Pengcheng Fu, Yue Hao, and Charles R. Carrigan Math, Science and Computation of Hydraulic Fracturing Workshop Stanford, March 21, 2013 This work was performed under the auspices of the U.S. Department of Energy by under contract DE-AC52-07NA Lawrence Livermore National Security, LLC
2 Included in these slides are interim results from a ongoing study. updated results. 2
3 Stimulate fracture system in hot rocks Circulate fluid through the fracture network to bring heat to surface 3
4 Fractures carrying more flow cools faster Thermal stress tends to loosen these fractures Flow might become more concentrated into a small number of fractures This is the primary mechanism for flow channeling A complex thermal-hydrologic-mechanical process Questions to answer: How it affects reservoir performance? 4
5 Rock joint model Aperture width Eff. on fracture DFN flow model Fracture flow network Solid FEM T field TH flow model 5
6 Rock joint model Aperture width Eff. on fracture DFN flow model Fracture flow network Solid FEM T field TH flow model 6
7 Rock joint model Aperture width Eff. on fracture DFN flow model Fracture flow network Solid FEM T field TH flow model 7
8 Rock joint model Aperture width Eff. on fracture DFN flow model Fracture flow network Solid FEM T field TH flow model 8
9 H =25 MPa Regular grid pattern with two orthogonal sets Fracture spacing 20m Natural pore pressure 15 MPa Closed-loop circulation at a constant flow rate. h =17 MPa T 0 =150 C Injection at 50 C 9
10 Initial flow rate distribution 10
11 T, 10 Years Produciton Temperature ( C) Time of production (month) T, 20 Years 11
12 Initial With TM 10 year later 12
13 Infinite medium T x ae T L ( a b)(1 ) 2b 2a T y be T L ( a b)(1 ) y x Cooling zone, T 13
14 Initial 10 years 10 year production Stress_xx Stress_yy 14
15 Assumptions: Fracture network consists of at least two fracture sets Well layout perpendicular to the minimum principal stress direction Resulting in: Flow in primary fracture set is fed by the secondary set Secondary set is the bottleneck, preventing a more diffuse flow pattern Cooling zone elongates along the primary set Greater thermal stress on the secondary set 15
16 W/o TM 10- year production 160 Produciton Temperature ( C) With TM effects W/o TM effects With TM 10 year production Time of production (month) 16
17 Network I 17
18 Produciton Temperature ( C) With TM effects W/o TM effects Time of production (month) W/o TM 20- Y production With TM 20- Y production 18
19 Network I Network II 19
20 Produciton Temperature ( C) With TM effects W/o TM effects Time of production (month) W/o TM 20- Y production With TM 20- Y production 20
21 Network I Network III Network II 21
22 Produciton Temperature ( C) With TM effects W/o TM effects Time of production (month) W/o TM 20- Y production With TM 20- Y production 22
23 Network I Network IV Network II Network III 23
24 Produciton Temperature ( C) With TM effects W/o TM effects Time of production (month) W/o TM 10- Y production With TM 10- Y production 24
25 Thermal drawdown does affect flow pattern We discovered a natural mechanism that counteracts flow channeling Related to anisotropy in thermal stress The extent of flow channeling is remarkably affected by natural fracture network patterns TM effects have a moderate effects on the arrival of thermal breakthrough (two mechanisms counteracting each other) Usually not a disastrous; also reduces pumping effort. TM effects substantially reduces the post-breakthrough value of reservoirs 25
26 This work was performed under the auspices of the U.S. Department of Energy by under Contract DE- AC52-07NA Predicting stimulation-response relationships for engineered geothermal reservoirs Creating Optimal Fracture Networks (#11-SI-006) Release number: 26
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