In our country, a significant proportion of oil and gas fields have acidic characteristics. In natural gas fields, the proportion of highly acidic gas fields is close to 50%. In recent years, large-scale oil and gas fields such as Tarim, Jilin, Luo Jia, and Pu Guang, as well as collaborations with countries such as Sudan, Kazakhstan, Uzbekistan, Turkmenistan, Indonesia, and Myanmar, are also primarily acidic and highly acidic oil and gas fields.
The corrosive environment in oil and gas fields is becoming increasingly harsh. The main manifestations include:
(1) After oil well extraction: Increased water content
(2) The development of deep and ultra-deep wells leads to: increased temperature/pressure.
(3) Developing oil wells in highly corrosive environments: H2S, CO2、Cl-putty powder-ready-mixed putty paste-peeling-detachment-substrate-interface treatment agentContent increase
These factors contribute to more severe corrosion in oil and gas fields. Corrosion of oil and gas pipelines, storage tanks, and separators is the most significant form of corrosion in oil and gas fields. Corrosion of pipelines and equipment can be divided into internal corrosion and external corrosion: external corrosion is primarily caused by factors such as soil, groundwater, and stray currents; internal corrosion is caused by internal media and is a current research focus and hot topic in corrosion science.
High-temperature, permeating powder coatings are a new type of modified resin powder coating with excellent molecular structure, suitable for high-temperature environments, especially for corrosion protection of pipelines in acidic oil and gas fields. It has excellent corrosion resistance and can effectively resist H2S, CO2、Cl-putty powder-ready-mixed putty paste-peeling-detachment-substrate-interface treatment agent- Corrosion of metals. Exhibits excellent high-temperature resistance, with good adhesion in complex oilfield environments such as oil, water, and acidic gases. It has a high-density cross-linked structure, resulting in very low gas permeability, and can be used in environments containing up to 60% H2- Used in natural gas environments. Due to its smooth surface and low friction properties, it can improve fluid efficiency in drilling operations and surface equipment.Comprehensive properties: good smoothness, high impact resistance, excellent adhesion, excellent corrosion resistance, and low gas permeability.
Performance requirements
To withstand these demanding conditions, high-temperature, penetrating powder coatings must possess unique properties.
Adhesion: It must adhere firmly to the protected substrate, without any detachment, peeling, or cracking, in a highly corrosive environment, in order to provide protection.
Impermeability: It should be able to resist penetration by various corrosive substances to protect the substrate, while the coating thickness should be suitable for different requirements.
Functionality: The coating should be able to withstand various mechanical stresses and have a long service life.
Furthermore, to meet the required specifications, the coating should also possess additional functionalities such as reduced friction, temperature resistance, and energy efficiency, etc.
Design Concept
Improve curing agent structure: Utilize a new curing agent with multiple functional groups to enhance the coating's high-temperature stability and resistance to high-temperature detachment.
Select new resins: Replacing existing resins with resins featuring a wide range of molecular weights and multiple functional groups to enhance the coating's resistance to high temperatures and its wet adhesion performance.
Coating microstructure design and control: Utilizing interlaced, elastic networks and organic/inorganic nanoparticle semi-rigid structures to reduce internal stresses in the coating caused by temperature fluctuations, increase the packing density of active channels in the coating system, and further enhance the coating's adhesion strength and impermeability.