The Experts below are selected from a list of 21 Experts worldwide ranked by ideXlab platform
Zhang Guojie - One of the best experts on this subject based on the ideXlab platform.
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control system of Drill Pipe Pressure welding production line based on network
Mechanical & Electrical Engineering Technology, 2011Co-Authors: Zhang GuojieAbstract:In control System of Drill Pipe Pressure welding production line which is based on the technology of industrial Ethernet and MELSECNET/H Network,the master computer IPC of delivering equipment gets and amends the information of Drill Pipes,and carry it to slave computer through industrial Ethernet.The slave computer,PLC,is made up of MELSECNET/H network with other procedures' control unit,transferring devices status and control command and realizing the automatic control of the production line.
Sharafaddi Osama - One of the best experts on this subject based on the ideXlab platform.
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Comparing Driller’s and engineer’s methods to control kick for basement reservoirs
2019Co-Authors: Sharafaddi OsamaAbstract:There are various difficulties involved in Drilling operations in the oil and gas industry. Well control is considered the most vital one. Well control systems are applied when a kick is detected entering the wellbore from the formation. Kicks occur when formation Pressure is greater than wellbore Pressure causing an influx of gas into the wellbore. Uncontrolled gas kicks have the potential to cause a blowout, resulting in financial loss, possibility of injury, loss of live, and pollution. Once a gas kick is detected, it has to be circulated out safely and efficiently to surface. While the influx of gas migrates in the wellbore toward the surface, it affects different parameters such Drill Pipe Pressure, annulus Pressure, fracture Pressure, bottomhole Pressure, and casing shoe Pressure. This work investigates and analyses these Pressure changes that act on these parameters during well control. A Drillbench simulator was used to conduct a comprehensive comparison between the Driller’s and Engineer’s method to determine the most effective method to kill the well in basement reservoirs. A case study was conducted on a Masila basement reservoir, since fractured basement is becoming an important oil and gas contributor to the petroleum industry. Engineer’s method showed better results and more advantages over Driller’s method since it would require only one circulation to kill the well and no potential for further kicks. The sensitivity analysis proved that kick size and kick intensity have significant effect while circulating the kick. The bigger the size of kick the higher Pressure profile was noticed. Similarly, an increase in kick intensity would result in increasing choke Pressure, casing shoe Pressure and pump Pressure
Mostovoy Evgeny - One of the best experts on this subject based on the ideXlab platform.
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Well Control Aspects of Riserless Drilling
Institutt for petroleumsteknologi og anvendt geofysikk, 2013Co-Authors: Mostovoy EvgenyAbstract:This master thesis has investigated feasibility of effective well control in riserless Drilling. An attempt was undertaken to design a realistic model of riserless well using advanced multiphase simulation tool and evaluate well control aspects as loss of primary well control, kick detection and well killing operations. One of the most significant findings in this study is that the well control procedures, which were specially developed for riserless and dual gradient application, do not work as expected. Modified Driller’s method and detection of shut-in Drill Pipe Pressure after well is shut with HCV did not show desired results during simulations and must be revised. With unknown formation Pressure it is impossible to circulate kick out of the well and pump the kill mud into the wellbore safely. And both Driller’s and Wait and Weight methods are not applicable. Therefore, well control operation in riserless Drilling cannot be executed safely and in controlled manner using current technologies and procedures. Kick detection in riserless system is similar to conventional Drilling. Almost all conventional kick detection methods are applicable in riserless Drilling and allow detecting the kick effectively. The speed of the subsea pump also proved to be an effective method, which can be used in addition to conventional ones. However, it is not possible to perform a flow check and fluid fill-ups on trips to verify that kick is taken. It was also shown that the new equipment with complex control logic–hydraulic control valve is a very critical element of riserless Drilling system. It is installed at the bottom of the Drill string, which creates restriction for its maintenance. Effectiveness of the well control relies solely on HCV in the situation when the well must be shut-in. Therefore, the fact that HCV is the single point of failure is considerable disadvantage of the riserless system. The results of this study indicate that new well control procedures for riserless Drilling require a high level of understanding of wellbore fluids influence on conditions in the well. Therefore, further development and utilization of model that was established in OLGA is important. It is also recommended that further research be undertaken in the following areas: Back-up emergency procedures for failure of the hydraulic control valve, subsea pump or both of them. Alternative well control procedures for the situation when the bit is not on the bottom. Research and development of the subsea pump so that new system would have high degree of operational flexibility to act not only as a pump but also as an analog of subsea choke during Drilling, tripping and well control operations. Prior to development of the technical solutions and procedures it is highly recommended to enhance accuracy of the model and simulation software. OLGA multiphase phase flow simulator is intensively validated against field data for subsea multiphase flow lines, production riser systems and gas condensate Pipelines. For the Drilling systems, the extensive validation campaign against the field data is required to increase the confidence in the simulations results. This could be achieved through the cooperation between leading oil companies via JIPs. In addition operator training simulators could potentially help with such a complex and dynamic phenomena. The verified (for long vertical risers/Pipes, with viscous mud) multiphase flow simulator could be integrated to the Drilling simulator. This online system could potentially predict the behavior of the flow during the gas kick in the system during the Drilling operation and will provide more time to react (as analogy to the OLGA/Hysys or Leda/K-Spice online integrated systems for the process/transport systems).
Erceg Davo - One of the best experts on this subject based on the ideXlab platform.
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Concurrent method of well killing and comparison to wait and weight method : master’s thesis
University of Zagreb. Faculty of Mining Geology and Petroleum Engineering. Department of Petroleum Engineering., 2017Co-Authors: Erceg DavoAbstract:Primarna kontrola tlaka u bušotini vrši se putem hidrostatičkog tlaka stupca fluida u kanalu bušotine. Ako je hidrostatički tlak manji od slojnog tlaka, vrlo će vjerojatno doći do dotoka slojnog fluida u kanal bušotine. Tada se pristupa gušenju bušotine. Tema ovog diplomskog rada je istodobna metoda gušenja bušotine i usporedba iste s inženjerskom metodom. U radu su slikovito prikazani koraci provođenja istodobne metode i, u svrhu boljeg razumijevanja, koraci provođenja inženjerske metode. Provedeni proračun razvoja tlaka na bušaćim šipkama i na ušću bušotine, s istim ulaznim podacima o bušotini, dotoku i svojstvima sloja, prikazuje osnovne razlike između dvije navedene metode. Razvoj tlaka prilikom provođenja obje navedene metode prikazan je na dijagramima koji prikazuju ponašanje tlaka na bušaćim šipkama i tlaka na ušću bušotine u ovisnosti o broju hodova pumpe.Abstract: Hidrostatic Pressure, which is result of the mud held in the annular space of well, is declared as the primary well control. If the hidrostatic Pressure is lower than formation Pressure kick will probably occur. Next step , if this happen, is well killing. The main subject of this thesis is concurrent method of well killing and comparison to wait and weight method. Main steps of concurrent and wait and weight method are shown and compared to each other. The calculation of Drill Pipe Pressure and casing Pressure, within same well, kick and formation characteristics, shows main differences between concurrent and wait and weight method. Pressure behavior is drawn on charts which show Drill Pipe and casing Pressure related to volume pumped into the well
Hejna Pette - One of the best experts on this subject based on the ideXlab platform.
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Investigation of U-tube effect in Drilling operation
Norges teknisk-naturvitenskapelige universitet Fakultet for ingeniørvitenskap og teknologi Institutt for petroleumsteknologi og anvendt geofysikk, 2010Co-Authors: Hejna PetteAbstract:The U-tube effect is present when Drilling with a low riser return system(LRRS)or a dual gradient system(DGS). For the LRRS the U-tube effect will initiate asthe surface mud pump is shut down. The mud level in the Drill string will drop until the hydrostatic Pressure in the Drill string and annulus are equal. When a DGS is applied, the U-tube effect will occur since the Pressure at the inlet of the seafloor pump is maintained near the hydrostatic Pressure of the seawater. Since the density of mud is greater than the seawater, the fluid level in the Drill string will drop due to the Pressure imbalance.The U-tube effect affects tripping operations when doing a connection since air will be injected into the Drill string as the fluid level drops when breaking the Pipe. The U-tube effect will also be dominant in a well control operation since the Driller can not measure the shut in Drill Pipe Pressure(SIDPP) due to the fluid level drop, unless a Drill string valve(DSV) is installed. Formation integrity test(FIT)and leak of test(LOT), for the LRRS and the DGS, have to be done in a different way compared to conventional due to the U-tube effect.The widening of the Pressure window, pore Pressure versus fracture Pressure, is one of the advantages with the LRRS and the DGS. The riser annulus consists of Drilling fluid and air on top in a static situation when the LRRS is used. This will result in a Pressure gradient that starts from the top of the mud column in the riser annulus and not from the rotary kelly bushing(RKB) as in conventional Drilling. The widening of the Pressure window for a DGS is a result of its dual density system, where the Pressure gradient from RKB to the seafloor is equal to the hydrostatic Pressure of seawater and the higher mud density below seafloor makes sure the bottom hole Pressure(BHP) is greater than the pore Pressure.Laboratory experiments for a small scale model of the LRRS show that the U-tube effect will last for 56 seconds when a 5/32" nozzle is used compared to 16 seconds when a 1032" nozzle is part of the system. The reduction of time to reach Pressure equilibrium is due to the increased flow area of the 10/32" nozzle.A best fit numerical model is compared with the lab experiments where the damping constant, kT , the area change constant, kB;o and the nozzle constant,knozzle;o, are tuned to match the measured data. The damping constant is smaller for the experiment with the 5/32" nozzle compared to the experiment with the 1032"nozzle, since the friction Pressure loss through the nozzle is greater due to the smaller flow area. Hence, the fluid level motion in the Drill string for the 5/32"nozzle experiment, does not need to be as damped as the 10/32" nozzle experimentThe best fit numerical model is verified by using different initial heights in the Drill string and annulus and equal values for kT , kB;o and knozzle;o . For the 8/32" nozzle,all the experiments with initial different heights matched the numerical model.This indicates that the numerical model can be used for different initial heights in the future, assumed that water is used as Drilling fluid and a 8/32" nozzle is part of the system.In the Pressure calcualtions based on experimental data, the friction Pressure drop in the annulus is neglected. To validate the assumption, the Reynolds numbers have been discussed. They show that turbulent flow will be developed for a system without nozzle, so the assumption was invalid for that case. It is in general controversial to neglect the effect of Pressure loss in annulus, but by doing so the results are closed up to the observations. The friciton loss in the annulus will be strongly influenced by the size of the nozzle in the Drill string.Future work should verify the numerical model for all the four nozzle sizes by using different initial heights. In this thesis, there were only available time for verifying the numerical model for the scale model with a 8/32" nozzle. Mud should also be used as Drilling fluid, but the problem with mud is to figure out how to measure the level change in the Drill string and annulus, since it is not possible to observe the level change visually due to settlement of mud particles on the Pipe wall.
