Study on catastrophe mechanism of hydraulic fracturing fracks initiation in radial boreholes
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Study on catastrophe mechanism of hydraulic fracturing fracks initiation in radial boreholes Wanchun Zhao . Jing Ge . Tingting Wang
. Hao Zhang . Yuwei Li
Received: 26 April 2020 / Accepted: 25 June 2020 Ó Springer Nature Switzerland AG 2020
Abstract Radial drilling hydraulic fracturing has become a new stimulation method. The hydraulic fracturing effect of radial drilling on site is not ideal, and the stimulation effect of some wells is not obvious. The hydraulic fracturing effect of radial drilling is closely related to the crack initiation position after radial drilling fracturing. In the past researches on fracture initiation in radial drilling hydraulic fracturing, it is believed that the fracture initiation position is the radial drilling position and extends along the drilling direction. In this paper, a new model is established to solve the problem of hydraulic fracturing initiation mechanism in radial drilling. By studying the crustal stress analysis around radial drilling, it is found that when the parameters such as angle or crustal stress reach a certain degree, the initiation position appears near the wellhead. The occurrence of
this mutation is the main reason for the unsatisfactory effect of hydraulic fracturing in radial drilling. The research results in this paper provide a reliable basis for radial drilling fracturing reconstruction of unconventional oil and gas reservoirs, and reference for the design of construction parameters of radial drilling.
W. Zhao Institute of Unconventional Oil and Gas, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
T. Wang (&) School of Electrical Engineering and Information, Northeast Petroleum University, Daqing 163318, Heilongjiang, China e-mail: [email protected]
W. Zhao Key Laboratory of Continental Shale Accumulation and Development (Northeast Petroleum University), Ministry of Education, Daqing 163318, Heilongjiang, China J. Ge Y. Li (&) School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang, China e-mail: [email protected]
Keywords Radical drilling Mechanical model Hydraulic fracturing Crack initiation List of symbols R Wellbore diameter (mm) r Distance from any point in the formation to the shaft axis (mm) d Permeability coefficient (dimensionless) Pp Initial pore pressure (MPa)
T. Wang Heilongjiang Provincial Key Laboratory of Networking and Intelligent Control, Daqing 163318, Heilongjiang, China H. Zhang Honggang Oil Production Plant, Jilin Oilfield Company, PetroChina, Songyuan 138000, Jilin, China
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u a Cr, Cb v rmax h Ps
Geomech. Geophys. Geo-energ. Geo-resour. (2020)6:47
Rock porosity, dimensionless Biot porous elastic coefficient, a ¼ 1 Cr=Cb (dimensionless) Rock skeleton compression ratio and volume compression ratio (dimensionless) Poisson’s ratio (dimensionless) Maximum principal stress (MPa) Tensile strength of rocks (MPa) Tensile strength of the rock (MPa)
1 Introduction Radial drilling technology
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