Maintaining the Efficiency of Drilling Fluids When They Are Transported by Platform Supply Vessel Class Offshore Vessels

Maryanov, Denys Mykolaiovych

doi:10.29013/ajt-21-7.8-22-28

Cited by 3 publications

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“…ISSN 2664-9969 processing of technical fluids (in particular, drilling slurries) can lead to excessive grinding of the dispersed phase and a further decrease in their tribotechnical characteristics [21]. This will subsequently negatively affect the drilling process [22,23]. After chemical treatment, the suspensions contain reagents that have a negative effect on the metal or synthetic elements of the drilling system and the circulation of the drilling slurry.…”

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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“…In studies [7,8], it was found that when drilling fluids are transported by PSV class vessels to offshore oil platforms, a latent stratification of drilling fluids occurs along the depth of the cargo tank. The consequence of this is a decrease in the sedimentation stability of the drilling fluid and the formation in the bottom of the cargo tank of sediment from heavy components with which it is alloyed.…”

Section: Introductionmentioning

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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Control and Regulation of the Density of Technical Fluids during Their Transportation by Sea Specialized Vessels

Maryanov¹

2022

SSRN Journal

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Maintaining the Efficiency of Drilling Fluids When They Are Transported by Platform Supply Vessel Class Offshore Vessels

Cited by 3 publications

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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

Control and Regulation of the Density of Technical Fluids during Their Transportation by Sea Specialized Vessels

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