Study on Effects of Low Viscosity Fluid Pre-injection on Hydraulic Fracture Complexity in Tight Heterogeneous Glutenite
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ORIGINAL PAPER
Study on Effects of Low Viscosity Fluid Pre-injection on Hydraulic Fracture Complexity in Tight Heterogeneous Glutenite Reservoirs Liaoyuan Zhang . Zhanqing Qu . Mingyang Zhai Bo Huang . Zilin Zhang
. Aishan Li .
Received: 7 May 2020 / Accepted: 17 August 2020 Ó Springer Nature Switzerland AG 2020
Abstract Tight heterogeneous glutenite reservoir is typically not easy to form complex hydraulic fracture (HF) due to its poor physical properties, poor matrix seepage capacity, and small limit discharge radius and undeveloped natural fracture system. To improve the HF complexity and the stimulated reservoir volume (SRV), a novel stimulation technology called CO2 miscible fracturing has been introduced and its fracturing mechanism has been studied. The CO2 miscible fracturing modifies the in situ stress field by injecting low viscosity fluid to increase the HF complexity and SRV. Therefore, a series of numerical simulations based on a hydro-mechanical-damage model were carried out to study the effects of low viscosity fluid pre-injection on pore pressure, stress field, and fracturing effect in tight heterogeneous
L. Zhang Z. Qu College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China L. Zhang A. Li B. Huang Z. Zhang Shengli Oilfield Branch Company, SINOPEC, Dongying 257000, China M. Zhai School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China M. Zhai (&) School of Civil Engineering, Liaoning Shihua University, Fushun 113001, China e-mail: [email protected]
glutenite reservoirs. The results indicate that the low viscosity fluid injection can effectively increase the pore pressure around the wellbore and reduce the effective stress of the glutenite. The FCI and SRV increase with the increase of the pre-injection amount of the low viscosity fluid. The HF complexity and SRV can be improved by pre-injecting low viscosity fluid to transform the in situ stress field. The field application of this technology in a well of Shengli Oilfield showed that low-viscosity fluid pre-injection can effectively increase the width of the fractured zone, improve the SRV, and optimize the fracturing effect. Keywords Tight heterogeneous glutenite reservoir Hydraulic fracture Low viscosity fluid pre-injection Pore pressure The width of the fractured zone Stimulated reservoir volume
1 Introduction Tight oil reservoirs are currently the main energy sources in the world and the basis for ensuring the development of the global economy. Tight glutenite reservoirs are widely distributed around the world and the efficient development of oil and gas in tight glutenite depends on the application of hydraulic fracturing technology. Hydraulic fracturing technology has been widely used in oil and gas development (Ma et al. 2017; Li et al. 2013, 2017; Li et al. 2016a, b;
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Geotech Geol Eng
Rickman et al. 2008; Cipolla et al. 2010), coal seam permeability enhancement and control (Peng et al. 2015; Xu
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