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Showing 1 to 13 of 13 for “"Leak Off"”.
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Boiler feed pump low load – leak off recirculation study
… start-up conditions. These plants make use of a leak off or recirculation system that diverts some of the flow back to the feed water tank, ensuring that a minimum flow through the pump is maintained at low load and start-up operating conditions. The recirculation valve, also known as a leak off …
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Low load operation of turbine-driven boiler feed pumps
… is affected; the viability of changing the pump leak-off philosophy; and the effect of electric feed pump use on power consumption. The main recommendations from the case studies were as follows: i. to stroke the steam admission valves as per the design charts, ii. to test the operation of the …
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Numerical simulation of fluid flow, proppant transport and fracture propagation in hydraulic fractures for unconventional reservoirs.
… proppant transport models ignore the fluid leak-off effect from the fracture side wall and the effect of fracture roughness. Thus, at the interface between the fracture and surrounding porous medium, the mass flow rate from the fracture to porous rock is calculated based on the permeability …
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Characterization of Filter Cake Buildup and Cleanup under Dynamic Fluid Loss Conditions
… cakes. By measuring its thickness and with the leak off volume, the concentration and yield stress of the filter cake can be estimated. The thickness of the filter cake was measured with a precise laser profilometer. Correlations are proposed to estimate filter cake properties (thickness, …
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Correlstion between the volume of slurry and the volume of fracture in Barnett Shale
… The crack density is always less than 1 due to leak-off of fracturing fluid into the reservoir during the hydraulic fracturing treatment.
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Acid Fracture and Fracture Conductivity Study of Field Rock Samples
… of inherent matrix permeability based on leak-off measurements and fracture conductivity measurements. Finally, the fracture conductivity of Sample D increased after exposure to a chelating agent. Commonly, acid fracture experimental studies are carried out with outcrop rock samples. The …
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Coupled 3-d numerical simulation of proppant transport and fluid flow in hydraulic fracturing
… the part of slurry injection, fluid flow, fluid leak-off, proppant transport, proppant settling and interaction between fluid and proppant particles. In this study, the focus is on fluid and proppant motion within hydraulic fractures. The effectiveness of hydraulic fracturing treatment is highly …
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Production Analysis and Enhancement in The Unconventional Tight Formations
… matrix is introduced. The fracturing fluid leak-off can damage the fracture conductivity and near-fracture matrix permeability, and consequently impair the well productivity after stimulation. In order to reduce this damage, this work applied data statistical analysis and numerical …
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Analytical Modeling of Multi-Fractured Horizontal Wells in Heterogeneous Unconventional Reservoirs
… partially propped fracture, (3) fracturing fluid leak-off damage, (4) dual or multiple damage effects. Simulation results indicate that choked frature damage influences early-mid time performance. Partially propped section within fracture dominates formation linear flow regime. Only severe matrix …
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13C-nuclear-magnetic-resonance of carbon monoxide on platinum: Study of a highly dispersed catalyst
… shift indicates that unpaired CO electrons leak off onto the platinum, requiring a mixing between CO molecular orbitals and Pt conduction electron wave functions at the Fermi surface. From the observed value of (AH/Ho)' we have made a crude estimate of the size of the mixing coefficients. …
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Carbon-13 - Nuclear - Magnetic - Resonance of Carbon Monoxide on Platinum: Study of a Highly Dispersed Catalyst (Nmr)
… shift indicates that unpaired CO electrons leak off onto the platinum, requiring a mixing between CO molecular orbitals and Pt conduction electron wave functions at the Fermi surface. From the observed value of ((DELTA)H/H(,0)), we have made a crude estimate of the size of the mixing …
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Fracture Stimulation by Nano-assisted Foam-based Fluids in High-Temperature Reservoirs
… reservoirs. Implementing fracturing foams offers several practical benefits, such as low water consumption, reduced formation damage, low leak-off rate and high efficiency in transporting and distributing proppants in the fractures. However, while surfactant agents are mainly used to …
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Simulation and optimisation of hydraulic fracturing and flowback in unconventional reservoirs: A case study in the Cooper Basin, South Australia
… Pressure Loss (NWBPL) and pressure dependent leak-off during hydraulic fracturing. In this thesis, tortuosity around the wellbore was found as the main reason and linked to 3D hydraulic fracturing simulation. 4. Using Discrete Fracture Network (DFNs) model, the well trajectory was optimized …