Development of the methodology of the choice of the route of work of platform supply vessels in the shelf of the seas

Akimova, Olga; Kravchenko, Alexandra

doi:10.15587/2312-8372.2018.146322

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…During ultrasonic treatment in a liquid flow, an impulse increase and decrease in pressure occurs in local volumes of the liquid. In this case, due to the occurrence of cavitation processes, additional turbulent flows arise, which increase the uniformity and prevent liquid separation [15,16].…”

Section: Research Of Existing Solutions To the Problemmentioning

confidence: 99%

Control and regulation of the density of technical fluids during their transportation by sea specialized vessels

Maryanov

2022

TAPR

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The object of research is the process of transporting drilling slurry through specialized marine vessels of the Platform Supply Vessels class. The subject of research is the sedimentation stability of the drilling slurry along the height of the cargo tank, which is proposed to be defined as a relative change in vertical density near the surface and bottom of the cargo tank. The studies were carried out on a specialized sea vessel with a displacement of 7320 tons. The design of the vessel provided for the reception and transportation of drilling slurry in four cargo tanks located on the port and starboard sides of the vessel. It has been experimentally established that during the 48-hour transportation, the density of the drilling slurry in the bottom part increases to 19.7 %; decrease in density on the surface – up to 7.8 %; decrease in the sedimentation resistance of the drilling slurry along the depth of the cargo tank – up to 29.85 %. A variant of modernization of the drilling slurry transportation system by installing additional circulation pumps providing forced circulation of the drilling slurry between cargo tanks is proposed. By using programmable microcontrollers (performing turning on/off the circulation pumps), it is possible to provide the following conditions for transporting the drilling fluid: an increase in the density of the drilling fluid in the bottom part up to 0.3 %; decrease in density on the surface – up to 0.25 %; decrease in the sedimentation resistance of the drilling slurry along the depth of the cargo tank – up to 8.01 %. It has been experimentally established that the creation of additional circulation and automatic support of the sedimentation resistance of the drilling fluid in the range of 2–7 % contributes to: – increasing the relative performance of cargo pumps from 38–55 % to 92–96 %; – reducing the time of pumping drilling slurry from cargo tanks to the drilling platform from 7.1 to 3.2 hours; – maintaining the technical condition of equipment, pipelines and elements of the drilling slurry transportation and pumping system.

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Section: Research Of Existing Solutions To the Problemmentioning

confidence: 99%

Control and regulation of the density of technical fluids during their transportation by sea specialized vessels

Maryanov

2022

TAPR

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“…Their physical and chemical features, as well as molecular structure, can significantly reduce the effectiveness of these processing methods. In addition, their use requires additional equipment, and in some cases independent installations, which affects the economic efficiency of the vessel [28,29].…”

Section: Research Of Existing Solutions To the Problemmentioning

confidence: 99%

Reduced energy losses during transportation of drilling fluid by Platform Supply Vessels

Maryanov

2022

TAPR

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The object of research is the process of drilling fluid transportation by Platform Supply Vessels. The subject of research is the energy losses when pumping drilling fluid from a platform supply vessel to an oil platform. The research was carried out on a vessel with deadweight of 3840 tons. It has been experimentally established that for a drilling fluid with an initial density of 1272 kg/m3 for transportation within 6–48 hours, the following changes in rheological characteristics occur: – a layer with a density of 1235–962 kg/m3 is formed on the surface of the cargo tank; – a layer with a density of 1283–1422 kg/m3 is formed in the bottom part of the tank; – sedimentation resistance decreases by 3.89–47.82 %. A variant of modernization of the drilling fluid transportation system by installing additional circulation pumps providing forced circulation of the drilling fluid between cargo tanks is proposed. Additional circulation of the drilling fluid with an initial density of 1272 kg/m3 for transportation within 6–48 hours ensures that the rheological characteristics are maintained in the following range: – density on the surface of the cargo tank 1270–1232 kg/m3; – density in the bottom of the tank 1288–1338 kg/m3; – decrease in sedimentation resistance 1.42–7.92 %. Similar results were established for drilling fluid with an initial density of 1323 kg/m3 and 1188 kg/m3. To reduce energy losses, the process of unloading the fluid onto the oil platform is proposed to be performed at the completion of the technological process of unloading the vessel. At the same time, due to a decrease in draft and an increase in the height of the freeboard of the vessel, the static component of the pressure and hydraulic losses of the cargo pump decrease. A set of studies for drilling fluids with different initial density (1272 kg/m3, 1188 kg/m3, 1323 kg/m3) confirmed that when using additional X-shaped drilling fluid circulation: – relative performance of cargo pumps increases from 37–57 % to 88–96 %; – the time of pumping the drilling fluid from the vessel to the oil platform is reduced from 7.1–8.5 to 3.3–3.8 hours. The presented results confirm the expediency of using additional X-shaped circulation of the drilling fluid to reduce energy losses during transportation by Platform Supply Vessels.

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“…One of the main difficulties that arise when converting diesel engines to operate using low-sulfur fuel is the following. A decrease in the sulfur content in the fuel leads to a decrease in its density, viscosity, auto-ignition temperature and an increase in the calorific value of the fuel (due to a proportional increase in the hydrogen and carbon content in the fuel) [13,14].…”

Section: Introductionmentioning

confidence: 99%

Development of method for managing risk factors for emergency situations when using low-sulfur content fuel in marine diesel engines

Sagin,

Sagin

2023

TAPR

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The operation process of marine diesel engines when using fuel with a sulfur content of no more than 0.1 % was chosen as the object of the study. Similar types of fuel are characterized by a lower auto-ignition temperature and higher calorific value. During combustion, this leads to an increase in the rate of fuel combustion and the degree of pressure increase during combustion, precisely because of this, the dynamic loads on the parts of the cylinder-piston group and diesel engine bearings increase. Also, this (due to the increase in temperature at the end of combustion) creates conditions for an increase in the concentration of nitrogen oxides in diesel exhaust gases. This (namely, the change in dynamic and thermal loads that occur during the use of fuels with a reduced sulfur content in marine diesel engines) leads to the occurrence of emergency situations. As a method of managing the risk of such emergency situations, the reconfiguration of the high-pressure fuel equipment, namely the change of the advance angles of the fuel supply, is proposed. The research was carried out on a vessel intended for the transportation of containers and on which a marine diesel engine 8K80ME-8.2-TII MAN-Diesel & Turbo was installed as the main engine. Combustion pressure, the degree of pressure increase during combustion, the temperature of exhaust gases, and the concentration of nitrogen oxides in exhaust gases were chosen as the indicators for evaluating the use and implementation of the proposed method. It has been experimentally proven that this results in an increase in the environmental sustainability of diesel operation by 3.61–10.97 %, an increase in thermal stability – up to 2.54 %, and an increase in dynamic stability – up to 4.82 %. This is due to the shift of the self-ignition and combustion process towards expansion and the corresponding decrease in pressure and temperature at the end of combustion. The most favorable use of this method is on modern diesel engines that have an electronic fuel injection control system, so they do not require mechanical reconfiguration of fuel pumps. Taking this into account, the method based on the change of fuel advance angles is defined as the one that provides management of the risk factors of emergency situations when using low-sulfur fuel in marine diesel engines.

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Development of the methodology of the choice of the route of work of platform supply vessels in the shelf of the seas

Cited by 4 publications

References 3 publications

Control and regulation of the density of technical fluids during their transportation by sea specialized vessels

Control and regulation of the density of technical fluids during their transportation by sea specialized vessels

Reduced energy losses during transportation of drilling fluid by Platform Supply Vessels

Development of method for managing risk factors for emergency situations when using low-sulfur content fuel in marine diesel engines

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