... Abstract The key to formation damage control is minimizing the depth of contact/impact of the formation and drilling fluid by minimizing solids and liquid invasion into porous (fractured) formations. Analysis of downhole filtration conditions and particle size (distribution) measurements were...

... Abstract Filtration from drilling fluids is a time-dependent and complex process. Mud composition, formation pressure, and temperature and permeability are some of the key factors affecting filtration behavior. Formation damage control and wellbore stability are the critical issues dealing...

... curve is observed in both laboratory coreflooding and well behaviour modelling. Impedance grows slower during external cake formation compared to that during deep bed filtration. This is due to low reservoir permeability and consequent high values of filtration and formation damage coefficients causing...

... easier by measuring static and dynamic filtration of drilling mud on changing temperature. Before designing a HPHT well there are two important cases which must be considered, the margin between the fracture gradient and the pore pressure is small what is critical in the design of the well and HPHT...

... reciprocal to well index) versus PVI. They consist of linear growth interval for deep bed filtration, another interval for the linear growth during formation of external filter cake, ending up with the stabilised value. This paper discusses the stabilised impedance calculation. The mathematical model...

... chemical reaction hydrochloric acid ilmenite particle filter cake water-based filter cake filtration permeability acid reaction dissolution drilling fluid chemistry drilling fluid formulation ilmenite water-based filter cake ilmenite titanium remove ilmenite water-based filter cake removal...

... ceramic disk filtration erosion drilling fluid chemistry drilling fluid formulation fluid loss filter cake rotation velocity drilling fluid property rotation duration spe 165107 filter cake thickness dynamic filtration propeller rotation velocity erosion time static condition...

... negligible with respect to effective porosity. Hence the change in effective porosity due to deposition of particles can be neglected. (3) The filtration coefficient depends on retained particle concentration through the use of nonlinear (exponential) filtration function. (4) The fluids, particles and rock...

... to be formed; its permeability will be the critical for preventing leak-off. In the second case deep-bed filtration will be dominant and the build-up of the much needed external filter cake will start only after a certain transition time; reduction of core permeability (formation damage) will be highest...

... ∞ ∂ ∂ t ∑ ( r s , x , t ) d r s = − 1 l ∫ 0 ∞ U C ( r s , x , t ) f a [ H , r s ] f n s [ H , r s ] d r s System of two eqs (20 , 21 ) for two unknowns describes size exclusion deep bed filtration...

... Abstract The invasion of drilling fluid filtrate into the region around the wellbore has long been recognized as one of the major factors contributing to damaging the reservoir formation. The volume of filtrate has a significant effect on the degree of damage, which is usually evaluated in API...

... drilling fluid formulation concentration size distribution diameter retention Modeling & Simulation Upstream Oil & Gas surface area experiment Computation filtration drilling fluid chemistry drilling fluids and materials polymer particle particle size filter cake equation...

... flow filtration permeability drilling fluid property Fluid Dynamics flow rate fluid invasion reservoir reservoir rock boundary condition wellbore resident fluid resistive force invasion Abstract Designing drill in fluids which can guarantee minimum invasion into the reservoir rock...

... drilling fluid selection and formulation Upstream Oil & Gas polymer particle microgel polymer drilling fluids and materials particle filtrate drilling fluid property polymer organosoluble polymer drilling fluid chemistry drilling fluid formulation formation damage filtration...

... injectivity decline is permeability decrease due to rock matrix plugging by solid/liquid particles suspended in the injected water 1 - 4 (The flow and deposition of particles in the rock matrix is called deep bed filtration). Abstract Injection of water with oily particles happens during...

... allows to perfectly match the experimental impedance curve and calculate from it three injectivity damage parameters – filtration and formation damage coefficients, and also the maximum retention concentration. The obtained values of filtration and formation damage coefficients are in the usual variation...

.... It is important to understand the factors that influence the formation of an external filtercake and improve injectivity. This paper introduces a new technique for examining time-dependent particle filtration processes in a sandstone core. Experimental work and analysis is presented of the filtration phenomena...

... of a study on formation damage, different concentrations of hematite particles suspended in water were injected into sandstone core samples at residual saturation. The theories of deep bed filtration are evaluated. The effects of residual oil on the filtration coefficient λ and the formation damage factor...

... particles containing in the injected aqueous suspension. The mathematical models for deep bed filtration of suspended particles with internal cake formation and for development of the external filter cake are well established 3 - 6 . The models are used for injectivity index decline forecast 4 - 7...

... velocity equation drilling fluids and materials particle size injection society of petroleum engineers perforation zone borehole Thickness cake thickness filtration permeability particle boundary condition filter cake Radial Geometry Introduction Many oil and gas reservoirs...