... Abstract Interactions of reservoir with drilling and completion fluids, mud cake and mud filtration, lead to formation permeability damages which result in reduction of production rate. For increasing the production rate and treating the formation damage, normally Matrix Acidizing and Hydraulic...

... Abstract In this work, we use the theory of multi-porosity multi-permeability porothermoelasticity to derive the analytical solutions of pore pressure and stresses for an inclined wellbore, accounting for a rate-dependent mud cake buildup on the wellbore wall. The solutions are further combined...

... setup capable to rotate and change well inclination. Nano-based drilling fluids consisting of spherical, cubical and tubular shapes nanoparticles as fluid loss additives were used. Mud cake quality, core permeability impairment and degree of formation damage at various well inclinations were examined...

... with drilling fluid's filtration. The effects of mud cake build up and filtration with time aids the understanding the physical mechanisms. The increase of drilling in high temperature and pressure zones (HTHP) necessitates studies that can predict filtrate invasion, and particle bridging. Decreasing the near...

.... However productivity can be seriously affected unless mud cake damage is efficiently removed from all producing intervals along the horizontal wellbore. In recent years eco-friendly and non-corrosive bioenzymes (α/β-amylase) have shown great potential in cleaning wellbores uniformly and achieving higher...

... drilling fluids and materials Upstream Oil & Gas strength new model hydraulic fracturing annular pressure drilling fracture initiation pressure Thickness wellbore integrity fracture gradient Wellbore Design mud cake mud cake thickness initial mud cake thickness drilling...

... Abstract A set of HPHT core filter press and a special manmade core have been designed to simulate the bond quality of second interface of cement job, i.e. the bond status between borehole wall rock contains mud cake and slurry, mud cake has formed on the rock at HPHT conditions. The filter...

... on experiments conducted at unrealistic down-hole conditions or with large scale equipments, which makes them unpractical to use as a routine lab test (1, 5). Even though, very important technical contributions have been published in the past addressing many of the key issues involved in mud-cake removal...

...Introduction Experimental Studies Materials The present study focused on removing filter cake generated by water-based drilling muds. The composition and properties of the drilling fluid used are given in Tables 1 and 2 , respectively. XC-polymer and other drilling additives were...

... damage has been successfully used in wells in the Niger Delta. The gelled acid system was tailored in the laboratory to meet the operators key objectives of removing mud cake and minimising formation damage. Laboratory tests run on the new system show distinctively that the gel has improved...

... the possibility of creating a preferential path for unwanted fluids by acid or reactive fluids in wells with close OWC or GOC. Field Case Histories in the Niger Delta show that the Pop-Off approach delivers superior productivity increments in wells damaged by drilling and completion mud filter cake. The Pop...

... in horizontal and deviated wells. Experimental data is presented to show that the pressure required to initiate flow into the wellbore after building up a filter cake is affected by rock permeability, mud properties such as particle size and cake yield strength, flow back velocity, and overbalance pressure...

... in the vertical direction yields fluid densities and fluid-contacts (GOC and WOC) in the reservoir. Reliable results are obtained when the mud cake isolates the wellbore from the formation. When mud cake cannot provide isolation, mud filtrate invasion continues and supercharging occurs. The issue of sample...

... Abstract Presently, the mud cake and the filtration of the mud are evaluated under qualitative criteria, using API rules In this paper, a novel method is introduced to determine the consistency and the mobility of the fluids through the cake. A study was conducted both statically...

... Abstract Dynamic filtration experiments were conducted on cores with water based muds at different mud flow rates. It was observed that the thickness of the mud cake was a sensitive function of the mud rheology, the mud shear rate and the permeability of the rock. A model was developed...

... Abstract Encountering mud cake is a natural consequence of the drilling operation in oil and gas wells. Thick mud cake requires extra drilling efforts to remove it. Thick cake increases filter loss, reduces wellbore space and causes the drill pipe to be prone to get stuck. This study aims...