... with its scaling tendency induced carbonate scales deposit. The impact of the completion brine and drilling mud and filtrate as whole losses or secondary filtrate were identified as contributors. The above study and its conclusions were reported concurrent with on-going planning for the next horizontal...

... 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...

... presented can be used to predict and avoid structural damage in future coring operations. Upstream Oil & Gas pressure contrast formation damage wellbore zone permeability Thickness sensitivity core damage permeability mud cake mud cake damage zone permeability filtrate reservoir...

... The tests illustrate that the initial damage caused by the 1.05 SG RDIF was not permanent; it could be cleaned-up with flow whereas damage mechanism induced by the 1.12 SG KCl/Glycol/CaCO 3 appeared to be permanent. Formation damage is proportional to the filtrate invasion; therefore, the amount...

... Wells real time system production monitoring Directional Drilling flow control equipment Reservoir Surveillance Upstream Oil & Gas drawdown drilling operation completion mud cake conventional completion icv completion mud filtrate comp fl frac filtrate saturation formation damage...

... collapsed as a result of an unexpected build-up of calcium carbonate scale in the well bore area and the tubing. Two mechanisms have been identified as the cause of this scale formation. First the interaction of the caustic filtrate of the formate brine with the calcium rich formation water leading...

... mass transfer phenomena. Obtained equations give concentration of the lost fluid with respect to time and position. Filtration of the drilling fluid at walls of the fracture is considered to be exponential which is ceased after mud cake is formed. A simulator is developed using derived equations...

...Mud Formulation and Test Method Table 1 Formulation of Drilling Fluid for Filtration and Formation Damage Tests Product (g) 9.8 lb/gal 15 lb/gal Base oil 470.669 153.5 Emulsifier 18 6 Wetting agent 2.94 4 Organclay 15 6 Fluid-loss-control agent 6 4, 8 or 24...

... in the porous medium and external filter cake formation. A comparison of the prediction and the observed invasion in real cores obtained in exploratory wells is presented. drilling fluids and materials viscosity Filter Cake Permeability Filtration Experiment Upstream Oil & Gas fluid invasion...

.... The quantification of the difference, the damage, is defined as the mechanical skin. Among others, two particular factors contribute for mechanical skin during the drilling process: reduction on the oil or gas saturation by the drilling fluid filtrate and reduction on the effective porous throat size by bridging...

... will also present some potential future developments in this area. well logging Brine CryoSEM fragment formation damage framework grain sludge filtrate core analysis Upstream Oil & Gas pore coating log analysis cryosem analysis fluid phase saturation retention sub-sampled fragment...

... reservoir drilling fluid property liner spe 95024 drilling fluid formulation drilling fluid selection and formulation filtrate brine lbm gal completion fluid drilling fluid chemistry operation reservoir drilling upstream oil & gas post treatment filter cake breaker treatment enzyme...

... for the developed models are also reported. The above mentioned methodology has been built into a simulator in Microsoft Excel with a user friendly interface. calculation wellbore flow in porous media fluid loss formation damage test reservoir drilling fluid chemistry backflush filtrate drilling...

...) are often used in order to minimize differential sticking and clay destabilization problems. The OBM's filtrate generates through the mud filter cake, when exposed to completion brine may form emulsion droplets that are not easily and fully removed during production, causing a permanent damage to rock...

..., where unexpected reactions between unspent acids and completion brine were observed in the well and also in microfluidic devices. drilling fluid selection and formulation filtrate concentration sample fluid buffer drilling fluid chemistry dye spe 82200 calcium analyte intensity chloride...

... These results were expected because the polymersurfactant blend has a moderate surface tension of about 35 dynes/cm. Surface tensions approaching zero are not desired because low surface tension promotes unwanted emulsions between crude oil and aqueous mud filtrates. Controlling interfacial...

.... It is intended to present future work using these methods, in parallel with well data. application mud application drilling fluids and materials upstream oil & gas experiment filtrate loss damaging mechanism laboratory drilling fluid formulation fluid application return permeability...

... based mud was prepared and the performances of xanthan and scleroglucan containing formulations were compared. This work covers not only the effect of the fluid composition, including the presence or not of drilled solids but also the filtration conditions such as shear rate and temperature. Filtration...

.... Depth of filtrate invasion is known to be controlled in part by formation permeability, by degree of static mud weight overpressure and by drilling fluid perfomance. In this study, the duration of dynamic interactions between bit, rock and mud is an additional control on filtrate invasion. This suggests...

... Abstract Wells drilled with oil-based muds can suffer from severe damage which decreases their overall productivity. During drilling, mud solid parts tend to form an external and internal filtercake along well bore through filtration, while liquid part (filtrate) tends to leak off...