Qiu Hui (Daiqing Oilfield Second Oil Production Plant 163414, Daqing City, Heilongjiang Province) Bai Yukun Li Haijun (Daqing Qingsheng Materials Co., Ltd., Daqing City, Heilongjiang Province 163453) Key words: FRP Gathering Pipeline Insulation Corrosion Epoxy Coating Application Daqing Qingsheng Construction Materials Company Glass The fiber plant researched and developed the FRP insulation anticorrosive pipeline. This FRP insulation anticorrosive pipeline is the ideal anticorrosive material needed in the middle and late stage of oilfield exploitation. The strength and anticorrosion performance of this pipeline can meet the technical requirements of oilfield oil, gas and water gathering pipelines. It is currently being used in oil fields.
Characteristics of FRP Insulating Anticorrosive Pipe FRP Insulating Anticorrosive Pipe has the following characteristics: It has excellent mechanical and physical properties. The FRP insulation anticorrosive pipe material density is lower than that of the traditional asphalt anticorrosion pipe. The thermal expansion coefficient and the steel pipe are generally equivalent to the heat transfer coefficient. Only 40% of the asphalt anticorrosive pipe is a good thermal and electrical insulator. The outer surface of FRP insulation anticorrosive pipe has high strength and impact resistance, and its appearance is not damaged during transportation and construction, which is superior to other anticorrosion pipelines.
Chemical resistant and long service life. FRP insulation anticorrosive pipe is made of glass fiber winding, unsaturated polyester curing, good electrical insulation and chemical stability. No electrochemical reaction occurs in contact with charged medium. External anticorrosion can prevent saline-alkaline soil during buried laying. Corrosion of the outer wall of the pipe, internal corrosion protection using epoxy powder coating or other anti-corrosion coating to prevent corrosion of oil produced water.
(4) High strength and durability. The tensile strength of FRP insulated anticorrosive pipe is up to 588 MPa. The traditional mature installation process is adopted in the actual production of oilfield to ensure its safe operation.
Field application effect analysis FRP insulated anticorrosive pipe was applied in the 2001 water injection well branch reconstruction project of Daqing Oilfield Second Oil Production Plant. A total of about 1km, these pipelines are in the low-lying reed pond, the soil is dominated by saline-alkali soil, the soil resistivity is below 100*, all of which are in the oilfield strong corrosion area, the soil thermal conductivity is 7. 521J/m*h. Medium-saturated, moist soil with a unit heat transfer equivalent to about 10 times that of normal soil.
The natural environment of the original pipeline laying position is relatively harsh. The application of FRP insulation anticorrosive pipe in the field is to verify the corrosion resistance of FRP insulation anticorrosive pipe under harsh environment, and evaluate the overall comprehensive performance and economic benefits of the anticorrosion insulation structure.
The FRP insulation anticorrosive pipe is not affected by the corrosion of the external soil environment, and has stable working performance and long service life. With 20 years of FRP pipes, the indicators are not attenuated and can be used for 3050 years. Taking the 1kmtoX5 pipeline as an example, the asphalt anticorrosive pipe is used, and its designed service life is 15 years. The actual service life of the FRP insulated anticorrosive pipe is generally more than 30 years without maintenance and repair.
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