Journal of Geotechnology and Energy
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ISSN 2720-3581
Issue Date
2021
Volume
Vol. 38
Number
No. 1
Description
Journal Volume
Journal of Geotechnology and Energy
Vol. 38 (2021)
Projects
Pages
Articles
Safety and health hazards during servicing wells: the example of slickline services
(AGH University of Science and Technology Press, 2021) Mazur, Chrystian
In the oil and gas industry there are many serious hazards. Possible aftereffects of accidents happening on wells producing gas or crude oil can have fatal consequences. Natural dangers such as high pressures, flammable and explosive fluids, $H_{2}S$ content all make every project demanding and special care should be taken when planning works in harsh conditions. There are many precautions that could be done to ensure the long service life of the production wells and these can be achieved with slickline services. Slickline is usually a good first choice to conduct operations on live wells, and the potential risks during this work should be analysed since safety measures are crucial for both people and the environment. Only after assessing them correctly can work be done securely and in a timely manner.
Separation of natural gas liquids and water from gas condensate
(AGH University of Science and Technology Press, 2021) Takerhi, Matthew Efe
Unlike dry gas reservoirs, condensate gas reservoirs contain a considerable amount of natural gas liquids which should be extracted to maximize energy usage. This paper uses Bryan ProMax to set up the processing units for the recovery of natural gas liquids and removal of water. The parameters for the simulation were a gas composition which assumes a sweet gas content. The outcome of the simulation includes reduction of water content below 7 lbm/MMscf, recovery of methane and recovery of propane and isobutane only. The glycol dehydration unit minimized water impurity, while cooling with Joule-Thomson valve and heat exchangers help in methane recovery and separation from natural gas liquids. The results show that natural gas liquid recovery which depends on gas composition can be recovered by controlling the conditions of several units, namely heat exchangers, flash vessels, cold separators, fractionators, stabilizers with their reboilers and condensers.
Kinetic modelling of biosorption for hydrocarbon removal from wastewater using a modified logistic equation
(AGH University of Science and Technology Press, 2021) Knapik, Ewa; Stopa, Jerzy
The application of raw and modified biomass to remove hydrocarbons from wastewater by adsorption is a common practice. A mathematical modeling of biosorption kinetics is a crucial step to optimize the remediation process. In the present study, kinetic studies were carried out to describe the sorption process of crude oilon waste sunflower stalk pith. To increase sorption capacity, the pith surface was modified with polydimethylsiloxane (PDMS) and hydrophobic $SiO_{2}$ nanoparticles. The maximum loading of sorption for raw and hydrophobized material was 17.76 g/g and 19.62 g/g for crude oil, respectively. The system reached the equilibrium stage after 24 hours. The uptake profiles have been described by the pseudo-first order rate equation and the pseudo-second order rate equation. The calculated results were compared with experimental data and their fit was poor. To predict biosorption kinetics, a new mathematically efficient procedure based on a modified logistic equation was developed. The results indicate that the sunflower pith is an eco-friendly sorbent with significant potential for the removal of crude oil from water phase.
The use of passive seismic exploration to identify oil-bearing reservoirs in the Udmurt Republic, Russia
(AGH University of Science and Technology Press, 2021) Lihačeva, Olʹga Vladimirovna; Kašin, Gleb Ûrʹevič; Mironyčev, Vadim Gennadʹevič
The level of oil production in the Udmurt Republic is currently experiencing a declining trend due to the depletion of large and medium-sized oil fields that have been in operation for a long time. Therefore, the main challenge in this region is to stabilize & increase oil extraction by means of exploring more promising oil fields of a smaller size. However, some issues cause difficulties. Firstly, 2D and 3D seismic data often do not provide the reliable mapping of small fields. Secondly, geological prospecting and exploration, along with exploratory drilling, make these works costly. Furthermore, the estimation of the reserves for such deposits often contains errors. Passive seismic exploration is proposed as a solution to these problems, reducing exploratory and exploitation drilling costs, with the time required for geological exploration also being diminished.
Risk assessment of packed holeassemblies for rotary well drilling
(AGH University of Science and Technology Press, 2021) Mislûk, Mihajlo Andrìjovič; Dolyk, Ruslan Nikolaevič
The main elements of the statistical model of packed hole assemblies (PHA) design for drilling holding sections in conditions of information uncertainty are formalized and described. A constraint system has been given for the angle maintenance conditions of wellbore direction and dynamic stability of bottom hole assembly (BHA) lateral vibrations. The influence of the information uncertainty of some factors (angle, parameters of the drilling practice, presence of local caverns, etc.) on risk indicators has been analyzed according to the results of the numerical calculations. It has been determined that the risks of angle maintenance disturbance are significantly influenced by the angle and weight on the bit (WOB), and dynamic stability conditions, such as angle and rotation frequency. Risks of multi-supported BHAs which have been designed for conditions of minimizing bit side force, dynamic stability and include 4-6 stabilizers.