A New Model for Formation Damage by Particle Retention

Abstract

This paper was selected for presentation by an SPE ProgramCommitcc following review of information contained in an abstract submitwdby the authors.Contentsof the paper, as prcscmedhave not been reviewed by the Society of Petroleum Engineers and arc subJcctcdto correction by the author(s). The material as presented, dots not necessarilyreflect any position of the Socic\y of Petroleum Engineers,its offtccrs,or members. Paper prcscmcd at SPE meetings arc subject to publication review by &lhorial Committees of Ihc .%iely of PcsrolcumEngineers.%srtission 10copy is rcsuic~edto ass abstractof noI more than 300words. Illustrslionsmay nol be copied. llrc abstraclshould contain conspicuousacknowledgmentof where and by whom the pspcr was preacnsed. Write librarian, SPE. P.O. Box 833836, TX 75083-3836, U.S.A., fax: 01-214-952-9435. AbstractThe formation damage caused by the injection of water containing suspended particles, which are stable and are not adsorbed spontaneously onto pore surfaces under Brownian motion. has recently been analyzed at a pore scale level. Formation damage is the result of four more or less overlapping successive steps: ( 1) deposition on a grain surface, (2) formation of mono-or multiparticle bridges with subsequent accumulation upstream from the bridges, (3) internal cake formation as soon as the nonpercolation threshold has been reached near the core entrance, and (4) external cake formation. The surface deposition is not uniform over the grain surface and varies from the upstream stagnation point to the near pore throat zone according to a function depending on flow rate and surface forces. The bridging of pore throats is strongly dependent on the effective pore throat-toparticle size ratio, and the pore-throat size is often reduced by previous surface deposition. Referencesand illustrationsat end of paperA new model has been developed to predict formation damage while taking into account these different steps. The dominant mechanism in each step is governed by parameters that have a clear physical meaning. However, due to the complexity of natural systems, these parameters cannot be quantitatively predicted from theoretical considerations but can easily be determined by specifically designed lab experiments. The model predicts the retention by deposition, by bridging and by subsequent accumulation upstream from bridges, the concentration in flowing particles and the local permeability reduction as a function of the distance from the inlet, as well as the overall permeability reduction, and the beginning of external cake formation.This new model appears to be an effective tool for analyzing the consistency of a set of laboratory data and for selecting the values of the parameters that must be introduced in a near-well bore field simulator for the proper prediction of formation damage in a given appi ication.

Effects of Fines Migration on Well Productivity During Steady State Production

“…Thus, both particle attachment and size exclusion are considered in the fines migration model. It is also assumed that other particle capture mechanisms such as bridging, re-entrainment of deposited particles, segregation, and diffusion are negligible (Nabzar et al, 1996;Iscan and Civan, 2006;Miguel and Reis, 2006;Rousseau et al, 2008;Civan, 2010). Permeability monotonically decreases during particle capture.…”

“…From Eq. (11) it follows that the form of Darcy's law for oil flux under the presence of connate water accounts for the permeability damage due to the attached and strained particles (Nabzar et al, 1996;Chauveteau et al, 1998;Mojarad and Settari, 2007;Rousseau et al, 2008)…”

Laboratory Study on a New Composite Plugging Material with High Bearing Strength and High-Temperature Resistance

“…Liquid and solid particles penetrate deeply into the reservoir and cause serious damage [2][3][4]. Particle invasion, phase trapping damage, and rock-fluid incompatibility are the main causes of formation damage [5][6][7]. ese problems are prominent in the Central Tarim Basin.…”

Water Quality and Well Injectivity

“…This essentaal feature of depositien kinetics has been introduced in the Pari s model as described in Ref. 3…”