NUMERICAL SIMULATION OF PRESENT GEO-STRESS FIELD AND ITS EFFECT ON HYDRAULIC FRACTURING OF FUYU RESERVOIR IN GAOTAIZI OILFIELD

WU Ya; DAI Jun-sheng; GU Yu-chao; SHANG Lin; LIU Qiang

Volume 20 Issue 4

Dec. 2014

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Article Navigation > Journal of Geomechanics > 2014 > 20(4): 363-371

WU Ya, DAI Jun-sheng, GU Yu-chao, et al., 2014. NUMERICAL SIMULATION OF PRESENT GEO-STRESS FIELD AND ITS EFFECT ON HYDRAULIC FRACTURING OF FUYU RESERVOIR IN GAOTAIZI OILFIELD. Journal of Geomechanics, 20 (4): 363-371.

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NUMERICAL SIMULATION OF PRESENT GEO-STRESS FIELD AND ITS EFFECT ON HYDRAULIC FRACTURING OF FUYU RESERVOIR IN GAOTAIZI OILFIELD

1.
School of Geosciences, China University of Petroleum, Qingdao 266555, Shandong, China
2.
Exploration and Development Research Institute, PetroChina Jidong Oilfield Company, Tangshan 063004, Hebei, China
3.
Exploration and Development Research Institute, PetroChina Daqing Oilfield Company, Daqing 163712, Heilongjiang, China

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Received: 2014-06-09
Published: 2014-12-01

Abstract

Abstract

In the research of present geo-stress of Fuyu reservoir in Gaotaizi oilfield, the micro seismic data and the experimental data of rock velocity anisotropy are used to get the directions of present geo-stress of wells. On the other hand, hydraulic fracturing data and rock dynamic experiment including paleomagnetic experiment, differential deformation experiment and acoustic emission experiment are employed to determine the value of present geo-stress of wells. Triaxial rock mechanical test is conducted to get rock mechanics parameters of Fuyu reservoir. On these basis, we have built up the three-dimensional finite element model by ANSYS software, which utilized the present geo-stress parameter of wells as constraint condition to proceed the numerical simulation of present geo-stress of Fuyu reservoir and to analyze the impact on artificial fractures in the fracturing operation created by the activity of natural fracture and present geo-stress. The results prove that the value of maximum horizontal principal stress stays in 34 MPa and its direction is NEE-SWW and the value of Minimum horizontal principal stress varies from 26 MPa to 30 MPa and its direction is NNW-SSE. The stress value in fault zone and anticlinal flanks in the northwest is much higher. However the gentle anticlinal core in the eastern and the southern part are low value zones. The anticlinal flanks and fault zone in the west are the active zones of natural fracture. The direction of artificial fractures are mainly affected by the natural fractures; in the eastern anticlinal core, the activity of natural fracture is lower.
- Gaotaizi oil field,
- present geo-stress,
- numerical simulation,
- artificial fractures

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