Inhibitors of Corrosion for Oil Industry
Development of Hydrogen Sulfide Corrosion Inhibitors for Oil and Gas Industry, Using Chloralkanes and Asymmetric Dimethylhydrazine (Rocket Fuel Propellant) Subject to Utilization.
Tech Area / Field
- CHE-IND/Industrial Chemistry and Chemical Process Engineering/Chemistry
3 Approved without Funding
A.N.Frumkin Institute of Physical Chemistry and Electrochemistry, Russia, Moscow
- Moscow State University / Department of Chemistry, Russia, Moscow\nOAO Sintez (1), Russia, Moscow\nRussian Scientific Center of Applied Chemistry, Russia, St Petersburg
Project summaryTitle of Project: Development of Hydrogen Sulfide Corrosion Inhibitors for Oil and Gas Industry. The aims of this project are the development or new high-efficiency hydrogen sulfide corrosion Inhibitors and development of the technology of the application of these inhibitors to oil and gas production Industry with a view to protect equipment and pipe-lines from corrosion occurring in presence of aggressive components (hydrogen sulfide, carbon dioxide, highly mineralized aqueous phase) in water-encroached products.
The rate of corrosion of old pipe-lines transferring water-encroached products in regions with pitting corrosion should be considerably decreased to (1-10) mm/year, and the protective effect should be higher than 95%. In fact, the pitting corrosion rate in small regions situated under loose layers of corrosion products difficult of access for corrosion inhibitors is higher by a factor of 20 - 100 than that of general-type corrosion occurring on other surfaces of pipe-lines. As a result, the service.Lives of pipe-lines and equipment decrease to 0.5 - 2 years against 12 years specified. In this situation, only high-efficiency inhibitors decreasing preferentially the cathodic process together with effective technological methods can stop the pitting corrosion process and prevent the subsequent ruptures of pipe-lines. These high-efficiency inhibitors can be obtained using chloralKanes of various compositions and structures, amines, or hydrazine derivatives. This would allow us to exercise purposeful control over the compositions and structures of compounds and the electron density distribution on nitrogen atoms, which as established, determines the functional properties of the resulting product.
A series of water-soluble inhibitors (ISK-1. ISK-2, etc.) were developed using this approach. These inhibitors are cation-active surfactants, which decrease the corrosion rate of pipe-lines om standard solutions of NAGE or hydrogen-sulfide-containing waste waters of oil fields to 0.05 - 0.02 mm/year and down. The hydrogenation degree does not exceed 0.3 cm3H2/100 g of metal. The high efficiency of these inhibitors at their low does and the preferential inhibition of the cathodic process would allow their application to worn-out pipe-lines, where corrosion often develops Into pitting corrosion, as well as to oil Held with a high sulfur content, where protection from hydrogen blistering and sulfide stress corrosion cracking play the foremost role
Under this project, we plan to select 3-5 variants of hydrogen sulfide inhibitors, whose effectiveness and technological efficiency will satisfy the technological requirements adopted this industry for the use of inhibitors in the systems of holding seam pressure and collection of oil and gas, and at sulfur-cleaning plants. At the subsequent stages, we plan to produce 2-3 batches of prototype inhibitors and to carry out their tests at deposits that are in the later stages of explorations, where there is hydrogen sulfide of biogeneous origin and preferential pitting corrosion, as well as in oil fields with high sulfur concentrations.Foreign collaborators can be engaged in both the solution of particular applied problems of corrosion inhibition and fundamental studies of the corrosion of construction materials and their corrosion protection with inhibitors. Interest in these studies has been already expressed by the specialists in physical chemistry and corrosion of the Department of Nuclear Energy of France.