The use of inhibitors in the gas industry has become an effective means of eliminating corrosion damage, especially with the development of hydrogen sulfide fields. New technologies and requirements for the production of inhibitors have emerged, which are to provide protection of the entire process chain starting from the well, complex gas treatment, pipeline and the gas processing plant at the completion.
Any gas field contains aggressive components in the form of carbon dioxide, hydrogen sulfide, low molecular weight organic acids and corrosion inhibitors are there to protect the equipment from corrosive effects. Therefore, the choice of inhibitor is determined by the following conditions:
- composition of the medium and its physicochemical properties,
- the technology of preparation and production of gas and condensate,
- the technology of their subsequent processing,
- design particulars of the equipment.
In other words, an inhibitor should have a positive effect on the extraction and processing, contribute to the intensification of the process. This is affected by the inhibitor’s technological characteristics, physicochemical and protective properties. Among these, specia lattention should be paid to the density of the liquid, and its viscosity. The latter is chosen based on the conditions under which the inhibitor is to be used. If it is to be introduced into the production medium, where it should provide quick access to the protected surface, the inhibitor must be a sufficiently mobile liquid. But if it is necessary to protect a large-diameter pipe or vessel by applying a film of inhibitor, then it is desirable to select a high viscosity inhibitor so it would not drain off from the surface.
When selecting inhibitors for the gas industry, it is important to consider their solidification temperatures and, as they gradually lose fluidity due to the increase in viscosity as the temperature decreases, the term «solidification temperature» may be considered relative. Nevertheless, this is an important parameter, especially for gas production in the extreme northern regions, where equipment operation is continued year-round. The inhibitor’s flash point should also be considered for fire safety reasons, since it is a highly flammable compound.
When using inhibitors in the gas industry, one should bear in mind that they must be delivered uniformly to the entire targeted surface area of the equipment, and therefore be well dispersed in the crude product, and this may be best achieved through high-pressure injection. Most often inhibitors are used for this purpose in the form of solutions because, due to the requirement of using small amounts, administering it in a pure form is problematic, so the solution to be used should be compatible with the mined product gas, for example, methanol, water, hydrocarbons.
Another important property to consider when choosing an inhibitor is its foaming tendency. It is not advisable to use high foaming tendency inhibitors to protect the pipeline leading to a processing plant, as the ingress of foam into refining equipment is undesirable. However, such inhibitor would be very effective in the protection of wells and mining equipment. It should be remembered that increasing the concentration of the surfactants in the inhibitor, will increase its foaming tendency.
Chemical supply company «Himsynthesis Alliance» LLC is engaged in wholesale deliveries of corrosion and hydrate inhibitors for gas and oil extraction and gas processing industries. The supplied products come in several modifications which differ both in chemical composition of their active component and the composition of the solvent. This allows for an optimal selection of options for the specific conditions of production and processing. The company’s specialists will help you optimize the composition of inhibitors, considering the specific production conditions in your area.