Science & Technology Review >

2014 , Vol. 32 >Issue 2: 37 - 43

DOI: https://doi.org/10.3981/j.issn.1000-7857.2014.2.006

Articles

Three-dimensional Numerical Simulation of Hydraulic Fracture Dynamic Propagation of Deviated Well

  • PENG Chengyong ,
  • ZHU Haiyan ,
  • LIU Shujie ,
  • YAN Chuanliang
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  • 1. China National Offshore Oil Corporation Research institute, Beijing 100027, China;
    2. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    3. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China

Received date: 2013-10-09

  Revised date: 2013-12-12

  Online published: 2014-02-14

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Abstract

The near wellbore fractures are very complex in deviated well. If the perforations are not along with the maximum principal stress direction, a micro-annulus between the cement sheath and rock formation interface is likely to generate. For a long time, it has been difficult to simulate the three-dimensional geometries of hydraulic fracture in deviated well. In this paper, using viscoelastic continuum damage pore pressure cohesive elements and considering casing, cement, formation, perforation and the micro annulus, a three-dimensional numerical simulation model of hydraulic fracture dynamic propagation of deviated well is established. Then, considering the dynamic evolution of permeability and porosity of the pay zone, the hydraulic fracture dynamic propagation of a 20° deviated well in the Bohai Basin oilfield is calculated, and the calculated well bottom-hole pressure curve is consistent with the field hydraulic fracturing treatment curve. The hydraulic fracture and micro annulus initiation and propagation mechanism are analyzed. The micro annulus initiates and propagates simultaneously alone the well axial and circumferential directions at the initial stage of hydraulic fracturing, and then it closes with the propagation of the hydraulic fracture. The two hydraulic fracture wings of the deviated well are almost symmetrical, and easily propagate into the caprocks where the in-situ stress is smaller, that is, the fracture height of the deviated well is hard to control.

Key words： deviated well; hydraulic fracturing; fracture propagation; micro annulus

Cite this article

PENG Chengyong , ZHU Haiyan , LIU Shujie , YAN Chuanliang . Three-dimensional Numerical Simulation of Hydraulic Fracture Dynamic Propagation of Deviated Well[J]. Science & Technology Review, 2014 , 32(2) : 37 -43 . DOI: 10.3981/j.issn.1000-7857.2014.2.006

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