The Experts below are selected from a list of 330 Experts worldwide ranked by ideXlab platform
Borivoje Pašić - One of the best experts on this subject based on the ideXlab platform.
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Risk Due Pipe Sticking
2013Co-Authors: Nediljka Gaurina-međimurec, Borivoje PašićAbstract:Stuck pipe is a common worldwide drilling problem in terms of time and financial cost. It causes significant increases in non-productive time and losses of millions of dollars each year in the petroleum industry. There are many factors affecting stuck pipe occurrence such as improper mud design, poor hole cleaning, Differential pressure, key seating, balling up of bit, accumulation of cuttings, poor bottom hole assembly configuration, etc. The causes of stuck pipe could be divided into two categories: (a) Differential Sticking and (b) mechanical Sticking. Differential-pressure pipe Sticking occurs when a portion of the drill string becomes embedded in a filter cake that forms on the wall of a permeable formation during drilling. Mechanical Sticking is connected with key seating, formation-related wellbore instability, wellbore geometry (deviation and ledges), inadequate hole cleaning, junk in hole, collapsed casing, and cement related problems. Stuck pipe risk could be minimized by using available methodologies for stuck pipe prediction and avoiding based on available drilling parameters.
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Spotting Fluids for Freeing Differentially Stuck Pipe
2010Co-Authors: Nediljka Gaurina-međimurec, Borivoje Pašić, Davorin MatanovićAbstract:Differential Sticking is, for most drilling organizations, the greatest drilling problem worldwide in terms of time and financial cost. Differential-pressure pipe Sticking occurs when a portion of the drill string becomes embedded in a filter cake that forms on the wall of a permeable formation during drilling. The dominant force is usually associated with a difference in pressures between the hydrostatic pressure of the mud and the pore pressure in the contact area, though adhesion and cohesion may also contribute some resistance to pipe movement. Some level of Sticking occurs routinely in drilling operations and Differential-pressure-pipe-Sticking problems may not be totally prevented. These events only became problematic if the force required to pull the pipe free exceeds the strength of the pipe. Differential-pressure pipe Sticking occurrence can be mitigated if some precautions are taken such as: maintaining the lowest level of fluid loss, the lowest level of drilled solids in the drilling fluid, and drill string rotation at all times, if possible as well as using the lowest Differential pressure and selecting a drilling fluid that will yield smooth filter cake with low coefficient of friction. If Sticking does occur, several methods can be used for freeing the stuck pipe but the most common approach is to place a small volume of oil, or special spotting fluid in a wellbore annulus to free Differentially stuck pipe. Spotting fluids are designed to free Differentially stuck drill strings by dehydrating or breaking up the filter cake, allowing penetration of the spotting fluid and wetting of the drill string. It reduces the stuck area and the forces of cohesion between the pipe and cake, and allowing pipe to be pulled free. Differential Sticking tendency of different drilling fluids were determined in laboratory using Sticking tester as well as influence of spotting fluids on freeing Differentially stuck pipe. Results of the testing are presented in the paper.
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Aphron-based drilling fluids : solution for low pressure reservoirs
The Mining-Geological-Petroleum Engineering Bulletin, 2009Co-Authors: Nediljka Gaurina-međimurec, Borivoje PašićAbstract:Drilling wells throughout depleted or low pressure reservoirs requires low density drilling fluids, often with density less than water. Methods to reduce the density of drilling fluids have included mixing-in air or nitrogen. However, problems with these approaches include instability of gas bubbles (bubbles collapse or expand) and increased costs. Recently, the use of micro bubbles named aphrons in drilling, completion and workover fluids has proven success in solving many problems related to low pressure reservoirs such as fluid loss control, formation damage, stabilization of multipressure sequences with one fluid and possible Differential Sticking. Aphrons represent bubble with uniquely structure stabilized with surfactant. Against conventional micro bubbles, aphrons are more stable in downhole conditions and they are generated using standard mixing equipment. Owing to their properties and overpressure in wellbore aphrons penetrate into low pressure layers and set up inner bridging. Depleted wells which are very expensive to drill underbalanced or with other remediation techniques can now be drilled overbalanced. This paper presents description of aphron structure and stability, aphron bridging mechanism, aphron-based fluid composition and properties and field experiences in applying aphron-based fluids.
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Temperature Effect on Rheological Properties of Formate Based Drill-in Fluid
2008Co-Authors: Nediljka Gaurina-međimurec, Katarina Simon, Davorin Matanović, Borivoje PašićAbstract:Formate-based fluids has been successfully used in over hunders HPHT well operations since they introduced in field practice. They have many advantages when compared with conventional HPHT drilling and completion fluids such as: minimal formation damage, maintenance of additve stability at high temperatures, reduced hydraulic flow resistance, low potential for Differential Sticking, naturally lubricating, low corrosion rates, biodegradability with little risk to the environment ect. Formate-based fluids can be applied in deep slim hole drilling, shale drilling, reservoir drilling, salt drilling and gas hydrate drilling. The laboratory testing was carried out to evaluate the rheological behavior of formate-based fluids as a function of temperature. Formate-based fluids were formulated using potassium formate brine, xanthan polymer, PAC, starch and calcium carbonate. Experimental results show that potassium formate improves the thermal stability of polymers.
Nediljka Gaurina-međimurec - One of the best experts on this subject based on the ideXlab platform.
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Risk Due Pipe Sticking
2013Co-Authors: Nediljka Gaurina-međimurec, Borivoje PašićAbstract:Stuck pipe is a common worldwide drilling problem in terms of time and financial cost. It causes significant increases in non-productive time and losses of millions of dollars each year in the petroleum industry. There are many factors affecting stuck pipe occurrence such as improper mud design, poor hole cleaning, Differential pressure, key seating, balling up of bit, accumulation of cuttings, poor bottom hole assembly configuration, etc. The causes of stuck pipe could be divided into two categories: (a) Differential Sticking and (b) mechanical Sticking. Differential-pressure pipe Sticking occurs when a portion of the drill string becomes embedded in a filter cake that forms on the wall of a permeable formation during drilling. Mechanical Sticking is connected with key seating, formation-related wellbore instability, wellbore geometry (deviation and ledges), inadequate hole cleaning, junk in hole, collapsed casing, and cement related problems. Stuck pipe risk could be minimized by using available methodologies for stuck pipe prediction and avoiding based on available drilling parameters.
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Spotting Fluids for Freeing Differentially Stuck Pipe
2010Co-Authors: Nediljka Gaurina-međimurec, Borivoje Pašić, Davorin MatanovićAbstract:Differential Sticking is, for most drilling organizations, the greatest drilling problem worldwide in terms of time and financial cost. Differential-pressure pipe Sticking occurs when a portion of the drill string becomes embedded in a filter cake that forms on the wall of a permeable formation during drilling. The dominant force is usually associated with a difference in pressures between the hydrostatic pressure of the mud and the pore pressure in the contact area, though adhesion and cohesion may also contribute some resistance to pipe movement. Some level of Sticking occurs routinely in drilling operations and Differential-pressure-pipe-Sticking problems may not be totally prevented. These events only became problematic if the force required to pull the pipe free exceeds the strength of the pipe. Differential-pressure pipe Sticking occurrence can be mitigated if some precautions are taken such as: maintaining the lowest level of fluid loss, the lowest level of drilled solids in the drilling fluid, and drill string rotation at all times, if possible as well as using the lowest Differential pressure and selecting a drilling fluid that will yield smooth filter cake with low coefficient of friction. If Sticking does occur, several methods can be used for freeing the stuck pipe but the most common approach is to place a small volume of oil, or special spotting fluid in a wellbore annulus to free Differentially stuck pipe. Spotting fluids are designed to free Differentially stuck drill strings by dehydrating or breaking up the filter cake, allowing penetration of the spotting fluid and wetting of the drill string. It reduces the stuck area and the forces of cohesion between the pipe and cake, and allowing pipe to be pulled free. Differential Sticking tendency of different drilling fluids were determined in laboratory using Sticking tester as well as influence of spotting fluids on freeing Differentially stuck pipe. Results of the testing are presented in the paper.
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Aphron-based drilling fluids : solution for low pressure reservoirs
The Mining-Geological-Petroleum Engineering Bulletin, 2009Co-Authors: Nediljka Gaurina-međimurec, Borivoje PašićAbstract:Drilling wells throughout depleted or low pressure reservoirs requires low density drilling fluids, often with density less than water. Methods to reduce the density of drilling fluids have included mixing-in air or nitrogen. However, problems with these approaches include instability of gas bubbles (bubbles collapse or expand) and increased costs. Recently, the use of micro bubbles named aphrons in drilling, completion and workover fluids has proven success in solving many problems related to low pressure reservoirs such as fluid loss control, formation damage, stabilization of multipressure sequences with one fluid and possible Differential Sticking. Aphrons represent bubble with uniquely structure stabilized with surfactant. Against conventional micro bubbles, aphrons are more stable in downhole conditions and they are generated using standard mixing equipment. Owing to their properties and overpressure in wellbore aphrons penetrate into low pressure layers and set up inner bridging. Depleted wells which are very expensive to drill underbalanced or with other remediation techniques can now be drilled overbalanced. This paper presents description of aphron structure and stability, aphron bridging mechanism, aphron-based fluid composition and properties and field experiences in applying aphron-based fluids.
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Temperature Effect on Rheological Properties of Formate Based Drill-in Fluid
2008Co-Authors: Nediljka Gaurina-međimurec, Katarina Simon, Davorin Matanović, Borivoje PašićAbstract:Formate-based fluids has been successfully used in over hunders HPHT well operations since they introduced in field practice. They have many advantages when compared with conventional HPHT drilling and completion fluids such as: minimal formation damage, maintenance of additve stability at high temperatures, reduced hydraulic flow resistance, low potential for Differential Sticking, naturally lubricating, low corrosion rates, biodegradability with little risk to the environment ect. Formate-based fluids can be applied in deep slim hole drilling, shale drilling, reservoir drilling, salt drilling and gas hydrate drilling. The laboratory testing was carried out to evaluate the rheological behavior of formate-based fluids as a function of temperature. Formate-based fluids were formulated using potassium formate brine, xanthan polymer, PAC, starch and calcium carbonate. Experimental results show that potassium formate improves the thermal stability of polymers.
Abbas Roohi - One of the best experts on this subject based on the ideXlab platform.
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improving the rheology lubricity and Differential Sticking properties of water based drilling muds at high temperatures using hydrophilic gilsonite nanoparticles
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019Co-Authors: Ehsan Pakdaman, Shahriar Osfouri, Reza Azin, Khodabakhsh Niknam, Abbas RoohiAbstract:Abstract Recent developments in nanofluids indicate that the addition of nanoparticles to water-based drilling muds can alleviate many drilling problems, including wellbore instability, lost circulation, torque and drag force, Differential pipe Sticking, and low drilling rates. In this study, the addition of hydrophilic Gilsonite nanoparticles (HGNs) to water-based drilling mud was investigated, and its effects upon the well-cleaning process, rheological properties, filtration loss reduction, lubricity characteristics, and, more importantly, on the Differential Sticking of the base fluid were evaluated. Hence, initially, the HGNs were characterized by means of Fourier transform infrared spectroscopy, the dynamic light scattering technique, as well as thermogravimetric and Differential thermogravimetric analysis. The results showed that after the addition of HGNs, the rheological behavior of the base mud before the hot roll process was improved, and, interestingly, after the hot roll at 149 °C and 4 h, the characteristics of the sample mud were significantly retained, compared to those of the base mud. Also, after the hot roll, the plastic viscosity (PV) improved, the yield point (YP) was remarkably maintained, and the ratio of YP/PV was enhanced. On the other hand, the American Petroleum Institute (API) filtration loss was reduced by 36%, and, additionally, after the hot roll process, the filtration loss reduction and the mud cake thickness in high-pressure high-temperature conditions diminished by 79.4% and 50%, respectively. After the hot rolling process, the lubricity coefficient and torque percentage dropped by 15% and 13.63%, respectively. Also, the HGNs reduced the Differential Sticking coefficient and increased the likelihood of Differential Sticking release of the base fluid by 61.5%.
Ehsan Pakdaman - One of the best experts on this subject based on the ideXlab platform.
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improving the rheology lubricity and Differential Sticking properties of water based drilling muds at high temperatures using hydrophilic gilsonite nanoparticles
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019Co-Authors: Ehsan Pakdaman, Shahriar Osfouri, Reza Azin, Khodabakhsh Niknam, Abbas RoohiAbstract:Abstract Recent developments in nanofluids indicate that the addition of nanoparticles to water-based drilling muds can alleviate many drilling problems, including wellbore instability, lost circulation, torque and drag force, Differential pipe Sticking, and low drilling rates. In this study, the addition of hydrophilic Gilsonite nanoparticles (HGNs) to water-based drilling mud was investigated, and its effects upon the well-cleaning process, rheological properties, filtration loss reduction, lubricity characteristics, and, more importantly, on the Differential Sticking of the base fluid were evaluated. Hence, initially, the HGNs were characterized by means of Fourier transform infrared spectroscopy, the dynamic light scattering technique, as well as thermogravimetric and Differential thermogravimetric analysis. The results showed that after the addition of HGNs, the rheological behavior of the base mud before the hot roll process was improved, and, interestingly, after the hot roll at 149 °C and 4 h, the characteristics of the sample mud were significantly retained, compared to those of the base mud. Also, after the hot roll, the plastic viscosity (PV) improved, the yield point (YP) was remarkably maintained, and the ratio of YP/PV was enhanced. On the other hand, the American Petroleum Institute (API) filtration loss was reduced by 36%, and, additionally, after the hot roll process, the filtration loss reduction and the mud cake thickness in high-pressure high-temperature conditions diminished by 79.4% and 50%, respectively. After the hot rolling process, the lubricity coefficient and torque percentage dropped by 15% and 13.63%, respectively. Also, the HGNs reduced the Differential Sticking coefficient and increased the likelihood of Differential Sticking release of the base fluid by 61.5%.
Saddok Benaissa - One of the best experts on this subject based on the ideXlab platform.
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New Water-Based Fluid for Increased Onshore Drilling Performance
2008Co-Authors: Erik L. Hoover, John B. Trenery, Greg Mullen, Saddok BenaissaAbstract:A new water-based mud system for onshore environments has been successfully introduced to provide increased drilling performance as compared to conventional water-based mud (WBM) systems. As onshore wells become more challenging, conventional water-based mud systems do not provide the technical aptitude required to drill these wells efficiently. As a result, operators choose to use oil-based mud systems (OBM) to reach their drilling objectives. Despite their technical merits, OBMs are often a costly solution with regard to waste disposal and lost circulation. A new high-performance water-based mud system has been designed to fill the technical performance gap between conventional WBM and OBM for onshore and inland water drilling. The system has undergone extensive field testing in a variety of onshore wells. This paper presents results from a three-well campaign in a South Texas field where Differential Sticking, losses, twist offs and catastrophic wellbore stability problems were experienced with conventional WBM and OBM. The paper provides a detailed technical overview of the system, the advantages of using the system as compared to conventional WBM and presents case histories from the South Texas drilling campaign.
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preventing Differential Sticking and mud losses when drilling
World oil, 2005Co-Authors: Saddok Benaissa, Alain Bachelot, Jean Ricaud, Gerard ArqueyAbstract:Field tests and lab work indicate mud losses in highly depleted sands can be reduced with a new formation sealing product.
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preventing Differential Sticking and mud losses in highly depleted sands
2004Co-Authors: Alain Bachelot, Jean Ricaud, Gerard Arquey, Saddok BenaissaAbstract:Drilling through depleted sands can result in a multitude of problems, such as lost returns, Differential Sticking, difficulty logging and the inability to reach the target depth. Often solving lost circulation can be difficult and costly as a result of non-productive time. Remedies to cure losses are diverse and sometimes misapplied, possibly complicating the problem. Additionally, Differential Sticking zones can have a direct implication on the selection of casing points and jeopardize the architecture of the well. When the thief zone is severely depleted, problem-solving approaches such as cement plugs, squeezes, expandable liner and casing-while-drilling are used but can be costly and not always successful. The use of fluid management techniques, team efforts and proper engineering has lead to the development of an innovative approach as an alternative to standard methods. This approach prevents the problems and avoids the complex processes of curing mud losses or stuck pipe. This new preventative approach with water-based mud has been applied in several different fields while drilling through highly depleted sands. This methodology has proven to be very successful in preventing Differential Sticking, mud losses, and Differential Sticking.
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down hole simulation cell for measurement of lubricity and Differential pressure Sticking
Distributed Computing, 1999Co-Authors: S Ottesen, Saddok Benaissa, J MartiAbstract:The impact of lubricity and Differential Sticking on well cost is becoming more important, due to activity increase in deviated and extended reach wells through depleted reservoirs. Drilling fluid characteristics play a major role in this area. A better understanding of the mechanism of Differential Sticking and proper evaluation of the lubricating characteristics of different drilling fluid systems, under simulated down-hole conditions, is becoming more important. A specially designed fully automated device permits accurate and reproducible measurements of coefficient of friction between metal and mud filter cake. It also monitors the variation of the filter cake pore pressure and permeability, corresponding forces and Sticking time. Testing principle is based on cylindrical captor equipped with sensors (rotational for lubricity and non-rotational with axial motion for Differential Sticking test). Displacement into the cylindrical filter cake is made automatically through lateral motion of a measurement cell that can be rotated 360 degrees. The main advantage of this apparatus is the fact that the pressure and force sensors are located inside the cell, allowing for direct measurements. Evaluation of both water and oil based fluids Differential Sticking potential can be achieved, and data generated can be a useful tool to take corrective measures in selecting a suitable stable drilling fluid/additives, that will help prevent Differential Sticking and reduce torque and drag. A series of Differential pressure Sticking tests have been conducted. Data generated were used to understand the phenomenon, to characterize the risk of Differential pressure Sticking associated with drilling fluids, and, also, will be used to further validate numerical models. This paper describes specifications and measurement principle of this special equipment, as well as first results on Differential pressure Sticking tests.