API TR 17TR6-2012 pdf download.Attributes of Production Chemicals in Subsea Production Systems.
This document identifies and specifies the essential attributes of production chemicals intended to be introduced to subsea oil and gas production systems. The document is intended for use by chemical suppliers to facilitate the provision of chemicals compatible with existing and intended subsea production systems (SPS) although it is envisaged that use of the document for specification purposes by the operators of such processes, will assist in ensuring the completeness of requests to supply. The application of the document requires acceptance of the principle that it is the supplier’s responsibility to ensure that the chemicals supplied are fit for purpose and safe to use, although it is acknowledged that this responsibility can only be fulfilled if specification of requirements is complete. To this end the document identifies essential information that only SPS designers and operators can provide but without knowledge of which, suppliers should not supply. In the requirements of this document, responsibility for obtaining these items of critical information is placed upon the supplier, in the expectation that designers and operators will respond with their ready provision. The functional performance of production chemicals is outside the scope of this document. The assessments and tests specified in this document are not intended to qualify materials for use in an SPS in respect of pressure containment, mechanical load, cyclic mechanical load, or other design parameters. The chemical-chemical compatibility of production chemicals at their respective application concentrations is also outside the scope of this document as is the effect of any incompatibility on their respective functional performance. Finally, this document does not consider the health, safety, or environmental (HS&E) implications of deploying a production chemical in an SPS.
3 Terms, Definitions, and Abbreviations 3.1 Terms and Definitions For the purposes of this document, the following definitions apply. 3.1.1 attribute Feature of a subsea production system that is fixed and inherent to the existence of the SPS. NOTE Examples of SPS attributes are a material of construction or the volume of a vessel. 3.1.2 bacteriostat Biological or chemical agent that prevents bacterial reproduction without killing or otherwise harming the bacteria. 3.1.3 barrier Element forming part of a pressure-containing envelope which is designed to prevent unintentional flow of produced/ injected fluids, particularly to the external environment.
3.1.4 barrier arrangement Provision of physical separation between two fluids during fluid change out in a fluid circuit, using a barrier element, e.g. a gel. 3.1.5 barrier fluid (spacer) Fluid introduced to the SPS as an intermediary to provide physical separation between an existing fluid and the fluid intended to replace it during the change-out process. 3.1.6 biofilm Viscous or gelatinous coating deposited on SPS components as a result of microbiological growth. 3.1.7 bunkering Transfer of production chemical from transport container to host facility storage facility. 3.1.8 chemical reaction Change of the chemical state of a substance, which may involve a change of oxidation state or molecular structure. 3.1.9 chemical injection system Facilities that inject a production chemical into produced or injected fluids. 3.1.10 completion fluid Fluid in the “A” annulus of a well between the production tubing and well casing. NOTE 1 The fluid may have been in the well when the well completion (tubulars, screens, packer, etc.) were run into the well, or was circulated into the well after the well completion was run. NOTE 2 Completion fluid can also be known as a “workover fluid”. 3.1.11 dead spot Localized region in a fluid circuit whereby fluid in a flowing circuit is stationary or flows at a much lower velocity than the bulk fluid, e.g. step change in bore diameter. 3.1.12 delivery fluid Fluid that is in the fluid conduits at the time of delivery of the SPS equipment. NOTE This fluid may be the service fluid, or where not the service fluid, will be changed out with the service fluid following installation of the equipment . 3.1.13 fluid conduit Steel tube or thermoplastic hose used in an umbilical, jumper bundle/assembly, rigid pipe-work, etc., for the transmission of fluids used in, or produced by a SPS. 3.1.14 fluid change-out Replacement of a SPS service fluid by another fluid.