Profile control performance and field application of preformed particle gel in low-permeability fractured reservoir
- PDF / 1,123,178 Bytes
- 6 Pages / 595.276 x 790.866 pts Page_size
- 8 Downloads / 204 Views
ORIGINAL PAPER-PRODUCTION ENGINEERING
Profile control performance and field application of preformed particle gel in low‑permeability fractured reservoir Bin Xu1,2 · Yan Wang2 Received: 4 September 2020 / Accepted: 13 November 2020 © The Author(s) 2020
Abstract Water well profile control is the main way to control water channeling in low-permeability fractured reservoirs, and preformed particle gels (PPGs) are commonly used. A preformed particle gel was prepared and the synthesis conditions were optimized. The temperature and salt resistant performance, plugging performance were investigated and the field application was tested. The results showed PPGs exhibited good temperature and salt resistant performance. PPGs with larger particle size showed greater plugging strength but shorter valid period. Field tests suggested that multiple rounds of profile control should be employed using PPGs with different particle sizes to achieve deep profile control. Keywords Preformed particle gel · Low-permeability fractured reservoir · Profile control · Field application · Plugging strength
Introduction Water production in oil-producing wells becomes more and more serious as the wells mature, especially in the exploitation of low-permeability fractured reservoir, such as water flooding, gas flooding and chemical flooding (Gu et al. 2014; Xu 2017; Zhang et al. 2018). Water well profile control is the main way to control water channeling in low-permeability fractured reservoirs. For low-permeability fractured reservoirs, a good profile control agent should have the following characteristics: injectable, good plugging performance, movable and pollution-free (Zhou et al. 2017). At present, the common profile control agents for fractured reservoirs include polymer gel (He et al 2009; Lu et al 2010), preformed particle gel (PPGs) (Imqam et al 2017; Sun et al 2019), polymer microspheres (Hua et al 2014; Li et al 2019), etc. As to particles like PPGs or microspheres, it is required that the initial size of the profile control agent must be smaller than the pore throat diameter of the formation; the profile control agent must
expand and have certain elasticity, and can produce deformation and breakthrough under certain pressure, so as to have the advantages of good plugging performance to achieve deep profile control. Before further injection implementation in oilfield, characterizing in situ rheology in porous media is critical (Santoso et al 2017, 2018, 2020) and a series of influencing factors on flow characteristics of injection fluid should be considered, such as Non-Newtonian behavior in porous media, possible injection issues in the wellbore, sheardependent viscosity and retention-agglomeration process at pore-scale (Torrealba et al. 2019; Zhang et al 2010). If the injected concentration or injection rate is too big, particles can buildup inside the pore throat, which can reduce the permeability of the reservoir (Santoso et al 2017). In this paper, a preformed particle gel was prepared by solution polymerization and the syn
Data Loading...
