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AssigneePetroleo Brasileiro S.A. - Petrobras
InventorsMARIO GERMINO FERREIRA DA SILVA, FRANCISCA FERREIRA DO ROSÁRIO
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The present invention relates to a Pig laser (10) that is equipped with a heating system to be used in the removal of scaling from subsea production systems (50) such as production lines, manifolds, ANMs and production columns. The induction promoted by the laser radiation is applied to the DTPA solution, heating and accelerating the reaction at the design limit temperature of the equipment to be descaling. At the same time, the laser is capable of maintaining the reaction temperature under control, considering the thermal demand of the reaction and the heat losses by the equipment that is located in ultra-deep waters, where the temperature is below 15° C. The target scaling is barium sulfate or strontium sulfate that are formed due to sulfated water coming from the reservoir that receives the injection of seawater without desulphation treatment. The present invention enables a method for descaling barium and strontium sulfate in the range of 60 to 100° C., with a pH preferably of 12.8, using DTPA composed in a 28.7% v/v solution and a mechanical agitation process.
A method of laser stimulation of barium and/or strontium complexion by DTPA comprising a Pig laser for generating Laser, where the application of Laser radiation generates heating of the DTPA solution preferably in the temperature range 60 to 100° C., with pH preferably 12.8, dissolving Barium Sulfate and/or Strontium Sulfate in DTPA solution, in which the solution is composed of distilled water and a concentration of 28.7% v/v of DTPA;
Dependencies are inferred from the claim text.