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Showing 1 to 20 of 32 for “"Drilling Fluid"”.
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Strength of drilling fluid filter cakes
… techniques are commonly used to prevent drilling fluid losses. Current methods generally require that particles are added to the drilling fluid to hinder fracture propagation, which creates practical difficulties as the particles are often relatively large. An alternative approach is the …
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Helical flow of non-Newtonian fluids, with reference to drilling fluid flow.
… desire to understand better the complex flow of drilling fluids in oil wells. After an initial discussion of the flow and its complexities, mathematical models are considered, and a 'helical flow' model adopted as being a reasonable approximation to the flow which may be solved in practice. …
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Demulsification and recycling of spent oil based drilling fluid as nanofiller for polyamide 6 nanocomposites.
Spent oil-based drilling fluid and cutting wastes are global liabilities due to their hazardous hydrocarbon content, which impacts negatively on flora, fauna, and global carbon footprint. The formulation of two demulsifiers to ensure chemically-enhanced phase-separation of this waste into oil, …
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The effect of oil-and-gas well drilling fluids on shallow groundwater in western North Dakota
… of an oil-and-gas well in North Dakota the drilling fluid is buried in the reserve pit at the site. Reclamation of the drill site is expedited by digging a series of trenches which radiate out from the reserve pit, The majority of buried drilling fluid is ultimately contained within these …
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Drilling fluids filtration and impact on formation damage.
… performance based on the total skin factor after drilling operations are: production logging, flow measurement and well test data. The total skin factor is used in the flow equations to estimate the production rate in wells that are affected by formation damage in order to optimise the flow system …
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Effects of filtration process variables on filter cake properties and formation
Drilling mud is fundamental during the drilling process because it performs multiple tasks which make the perforation of the rock possible. For this reason, lost circulation, the loss of drilling mud through fractures in the formation, represents a serious issue in the oil and gas industry, since …
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Water-based drilling fluids for high temperature and dispersible shale formation applications
The negative impacts of drilling fluids, most especially oil-based muds, on the environment are a source of concern to regulators and governments all over the world. Consequently, regulations on the discharge and disposal of drilling fluids worldwide have become stricter. The recent research in …
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The effect of testing conditions on lost circulation materials' performance in simulated fractures
… circulation (LOC) problems increase costs of drilling significantly. It is not only the cost of the drilling fluid that is lost into the formation but also the costs of subsequent problems that can be higher than the cost of the drilling fluids. LOC also possibly leads to a serious risk of …
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Evaluation of recrosslinkable preformed particle gel (RPPG) as a fluid loss control material during drilling operations
… expensive, and time-consuming problems during drilling operations is the loss of circulation, which could result in several consequences, including wellbore collapse, fluid inflow, formation damage, environmental issues, and nonproductive time. This research aims to evaluate novel materials …
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Resistivity Characterization and Modeling of Synthetic Based Drilling Fluids and Corrosion Detection in Steel
With deeper drilling concern (high in situ pressure and temperature) and increased environmental concerns, there is interest in developing synthetic based drilling fluids. In this study, synthetic based drilling fluids (SBF) with very high insulation properties were developed for high pressure and …
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Contaminant migration of oil-and-gas drilling fluids within the glaciated sediments of north-central North Dakota
… reclamation in North Dakota is to bury the drilling muds in shallow trenches near the borehole. These muds are saltwater based (between 100,000 and 300,000 mg/L of NaCl) and can contain high concentrations of chromium, lead, and other. toxic trace metals. </p><p>Two reclaimed oil and gas …
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Reduction of energy losses: a key to improved rock drilling?
The viscous power losses of a rotary-vibratory drilling system are estimated in this study. Rotational and pure vibratory losses are considered separately. This analysis indicates that considerable power is dissipated into the drilling fluid. Pure vibratory power losses of over 3,728 W (5 hp) are …
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Modeling of Pipe Friction and Smear Effect in Drilling Operations
The increased complexity of drilling programs has led to the development of new drilling techniques and has resulted in problems that were not encountered before. This study focuses on two such issues: 1) to model the influence of wellbore friction on downhole temperatures of the drilling fluid, 2) …
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Transfer matrix analysis of an electrohydraulically driven rotary- vibratory drilling system
… vibratory component of a rotary-vibratory drilling (RVD) system driven with an electrohydraulic inertial mass exciter. The RVD system is a hybrid drilling system consisting of a conventional rotary drilling system assisted by forced harmonic vibrations. The model includes a drill string …
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Modelling and Analysis of the Axial Vibration on BHA of Horizontal Drilling Rig
Horizontal drilling technology is a widely applied well drilling technology due to its capability of reducing drilling time and cost, and at same time increasing the production. In practice, oil and gas production companies employ rotary steerable system or positive displacement motor to steer the …
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Cuttings transport and hydraulics optimisation for underbalanced drilling (UBD) operations in concentric and eccentric, directional and extended reach wells.
Underbalanced drilling facilitates the effective control of wellbore pressures - amongst several other important advantages - when compared to conventional drilling technology. However, this involves the flow of multiphase fluids, which introduces additional complexities due to highly transient …
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Estratégias baseadas em reticulação de polímeros para evitar perdas de circulação em poços de petróleo
Drilling operations with high e ciency and control is a topic of utmost interest in the exploration of oil and gas because it is directly linked to aspects of personal, environmental and economic safety. Many procedures should be performed for good control of the well. Among them, it is essential …
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Development of an optimised integrated underbalanced drilling strategy for cuttings transport in gas-liquid flow through wellbore annuli.
… the relationship between gas-liquid two-phase fluid flows and the effects of the major drilling variables is critical to optimising underbalanced drilling (UBD) operations, to date, this has been an area of limited research and knowledge. This study contributes to the limited knowledge base by: …
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Numerical and field data analysis of drill stem vibration
… premature failure of drill stem components and drilling inefficiency. In severe cases, drill stem vibration may lead to wellbore instability that could lead to increased operational cost. Drill stem vibrations are affected by design decisions and the drilling environment. Examples are; bottom …
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An evaluation of subsea pump technologies that can be used to achieve dual gradient drilling
Dual Gradient Drilling is an exciting technology which promises to solve the current technical hurdles and economic risks of Deepwater Drilling. Several techniques for Dual Gradient Drilling have been proposed to the industry. One such method involves installing a subsea booster pump at the …
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