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|Title:||Damage characterization of deep bed filtration from pressure measurements|
van den Broek, W.
|Citation:||International Symposium and Exhibition on Formation Damage Control, Lafayette, Louisiana, 20-21 February 2002: 11 p|
|Conference Name:||International Symposium and Exhibition on Formation Damage Control. (2002 : Lafayette, Louisiana)|
|Abstract:||<jats:sec> <jats:title>Abstract</jats:title> <jats:p>Permeability decline occurs during injection of sea or produced water, resulting in well impairment. Solid and liquid particles dispersed in the injected water are trapped by the porous medium and may increase significantly hydraulic resistance to the flow.</jats:p> <jats:p>We discuss a mathematical model for deep bed filtration containing two empirical parameters - filtration coefficient and formation damage coefficient. These parameters should be determined from laboratory coreflood tests by forcing water with particles to flow through core samples. A routine laboratory method determines the filtration coefficient from expensive and difficult particle concentration measurements of the core effluent; then the formation damage coefficient is determined from inexpensive and simple pressure drop measurements.</jats:p> <jats:p>An alternative method would be to use solely pressure difference between the core ends. However, we have proved in earlier work that given pressure drop data in seawater coreflood laboratory experiments, solving for the filtration and formation damage coefficients, is an inverse problem that determines only a combination of these two parameters, rather than each of them.</jats:p> <jats:p>A new method for the simultaneous determination of both coefficients is developed here. The new feature of the method is that it uses pressure data at an intermediate point of the core, supplementing pressure measurements at the core inlet and outlet. The proposed method furnishes unique values for the two empirical coefficients, and the solution is stable with respect to small perturbations of the pressure data.</jats:p> <jats:p>In the current work the proposed method is used for analysis of laboratory test data on deep bed filtration. The values of filtration and formation damage coefficients are obtained for flow of solid and liquid particle dispersions in a number of different cores. Effects of particle type and porous media wettability on permeability decline are analyzed.</jats:p> <jats:sec> <jats:title>Introduction</jats:title> <jats:p>Injectivity decline of oilfield injection wells is a widespread phenomenon during sea or produced water injection. This decline may result in significant cost increase in waterflooding projects. Reliable prediction of this decline is important for waterflood design as well as for choice and preventive treatment of injected water1,2. One of the reasons for well injectivity decline is permeability decrease due to rock matrix plugging by solid or liquid (oleic) particles suspended in the injected water.</jats:p> <jats:p>The flow and deposition of particles in the rock matrix is called deep bed filtration. The mathematical model for deep bed filtration presented by Herzig et al.3 and by Sharma and Yortsos4 contains two empirical parameters - filtration coefficient ? and formation damage coefficient ß. Knowledge of these two parameters is essential for predicting well injectivity decline during sea or produced water injection. These parameters are empirical, therefore they should be determined from laboratory coreflood tests by flowing water with particles through rock.</jats:p> <jats:p>Pang and Sharma5 and Wennberg and Sharma6 showed that both parameters can be inferred from combined measurements of core pressure drop and of suspended particle concentration in core outlet water. The method is based on analytical solution of model4 for linear deep bed filtration with constant filtration and formation damage coefficients. In general, the filtration coefficient ? and the permeability k are arbitrary functions of deposited concentration, and these functions can also be found from pressure drop and outlet concentration by solving functional and integral equations7.</jats:p> </jats:sec> </jats:sec>|
|Description:||SPE paper no. 73788-MS|
|Rights:||Copyright 2002, Society of Petroleum Engineers Inc.|
|Appears in Collections:||Australian School of Petroleum publications|
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