Abstract
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.
Highlights
IntroductionTransportation, which is carried out by sea transport vessels, is not limited to bulk, bulk and bulk cargo
The content of alloyed components in the total mass of the drilling slurry can be 10–15 %, and their specific gravity exceeds the specific gravity of the hydrocarbon base into which they are introduced [2, 3]
– maintaining the functional properties of the drilling slurry; – minimizing the formation of sediment of heavy components with which the drilling slurry is alloyed; – reduction of additional energy consumption associated with the constant operation of circulation pumps, and reduction of the time for pumping the drilling slurry from the cargo tanks of the vessel to the oil platform
Summary
Transportation, which is carried out by sea transport vessels, is not limited to bulk, bulk and bulk cargo. To ensure maximum drilling productivity, as well as to maintain the functional properties of drilling slurries for a long time, special reagents are introduced into the composition of suspensions (which are based on hydrocarbons) (for exam ple, solutions of NaCl, KCl, CaCl2, MgCl2 salts, as well as organic silicon compounds). The result of such alloying is the formation of a strong adsorption film on the rubbing surfaces and an increase in the anti-wear properties of the drilling slurry. Maintaining the performance characteristics of drilling slurries during their transportation by PSV-class sea vessels is an urgent applied scientific and technical problem, the optimal solution of which has not yet been found
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