tailieunhanh - Reservoir Formation Damage Episode 3 Part 8

Tham khảo tài liệu 'reservoir formation damage episode 3 part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Reservoir Sand Migration and Gravel-Pack Damage 657 where Vpv is the induced velocity of particles and fsw is the shear wave frequency. In case of the lack of information for Eq. 20-4 Hayatdavoudi 1999 recommends estimating by ữị 20-5 where g denotes the gravitational acceleration. Hayatdavoudi 1999 points out the importance of the buoyant unit weight of the in-situ particles when determining the particle mass and estimates the in-situ particle mass by m yaVe g z 20-6 where z represents the depth or height measured from a reference datum ft and yave is the average specific weight of the formation sand lb ft3 . The latter is expressed as 1 i y avg ry y in the I y in the k oil zone water zone J 20-7 in which the specific weights of the sand grains in the water and oil zones are given respectively by y in the I 20 8 water zone 1 T Í y in the oil zone y0G 20-9 1 e where the void ratio e in terms of the fractional porosity Ộ is given by e 1 1-Ộ 20-10 and yw and yo are the specific weights of the water and oil phases and G is the specific gravity of the sand grains. As a fluid flows over the face of a cohesionless bed of particles such as sand or gravel the particles can be detached and lifted-off when the fluid shear-stress exceeds the minimum critical shear-stress. Yalin and 658 Reservoir Formation Damage Karahan 1979 developed a dimensionless correlation to predict the critical conditions for onset of particle mobilization or scouring by fluid shear. Following their approach Tremblay et al. 1998 developed Mcr Re -206 20-11 in which Recr is the critical particle Reynolds number given by ReCr ỉ2 - 20-12 where vcr is the critical shear velocity d is the mean particle diameter and p and 1 are the density and viscosity of the fluid flowing over the particle bed. Mcr is the critical mobility number given by 20-13 where ys denotes the specific weight of the particles suspended in the fluid. Applying Eq. 20-11 Tremblay et al. 1998 correlated their experimental .