Reservoir Formation Damage due to Mud Filtration

Abstract

Transport of particle suspensions in oil reservoirs is an essential phenomenon in many oil industry processes. Solid and liquid particles dispersed in the drilling fluid (mud) are trapped by the rock (porous medium) and permeability decline takes place during drilling fluid invasion into reservoir resulting in formation damage. The formation damage due to mud filtration is explained by erosion of external filter cake. Nevertheless, the stabilization is observed in core floods, which evidences internal erosion. A new mathematical model for detachment of particles is based on mechanical equilibrium of a particle positioned on the internal cake or matrix surface in the pore space. In the current work the analytical solution obtained for mud filtration with one particle capture mechanism with damage stabilization. The particle torque equilibrium is determined by the dimensionless ratio between the drag and normal forces acting on the particle. The maximum retention function of the dimensionless ratio closes system of governing equations for colloid transport through porous medium.

Effect of barite and gas oil drilling fluid additives on the reservoir rock characteristics

“…The results indicated the biological method could efficiently reduce formation damage caused by various polymers that were existing in drilling fluids, but this method can actively propagate at temperatures as low as 20°C. Dabiri et al (2013) explained the formation damage due to erosion of external filter cake. All the researchers were corroborated the effect of drilling fluids on the petrophysical properties during the drilling process and developed different treatment techniques to void the negative effects.…”

Transient response of near-wellbore supercharging during filter cake growth

“…Traditional models for wellbore stability research have considered either a wellbore with an impermeable filter cake or one with no filter cake at all (Halafawi and Avram, 2019;Meng et al, 2019;Rahman, 2010, 2011;Ubedullah et al, 2019). In reservoir damage analysis of over-balanced drilling, the main damage types include water locking damage, sensitivity damage, and solid phase invasion damage, and those damages are influenced directly by the drilling fluid invasion process (Dabiri et al, 2013;Li et al, 2017;Zheng et al, 2019), which means that the formation damage is closely related to filter cake time-dependent properties. In addition, the invasion radius is an important parameter to describe the degree of formation damage (Civan, 2016;Ling et al, 2015;Parn-anurak and Engler, 2005), and this radius can be visualized more intuitively according to the supercharging distribution near the wellbore.…”

Formation protection method of oil‐based drilling fluid for deep fractured tight gas reservoir

“…There have been many studies on the problem of reservoir damage of oil‐based drilling fluids. This kind of research has been receiving more and more attention in the near future since the 1990s 10‐12 . The existing research focuses on the analysis of single damage mechanism and mainly focuses on liquid traps, wettability, and other research hotspots.…”

“…This kind of research has been receiving more and more attention in the near future since the 1990s. [10][11][12] The existing research focuses on the analysis of single damage mechanism and mainly focuses on liquid traps, wettability, and other research hotspots. A few systematic studies rarely consider the comprehensive effects of multiple factors.…”