Carbon fibre technology solves oilfield pipe column corrosion problem

Carbon fibre technology solves oilfield pipe column corrosion problem

Recently, there is good news from Shuguang Oil Production Plant in Liaohe Oilfield of China National Petroleum Corporation. Among them, the fire-driven experimental wells extended the pumping cycle by 20 days on average, and the pumping efficiency was at the normal level, while the viscosity loss rate of chemical-driven experimental wells was reduced by 2.3%.

As two of the most important development methods in Shu Cai Plant, the corrosion problem of the tubular column of fire drive and chemical drive has greatly reduced the production efficiency and affected the development effect. Especially in the fire-driven block, the corrosion problem is more serious, with the average pump inspection cycle of corroded wells only 70 days, and some corroded wells have corrosion through the tubular column within 20 days of pumping.

After several rounds of screening, the plant's researchers selected a chemically stable and chemically resistant carbon fibre coating as the experimental material for fire drive tubular column corrosion protection. They found that the carbon fibre coating could be permanently adhered to the surface of the pipe column, which also provided strong support for chemical drive injection and adhesion.

Combining the fire drive and chemical drive conditions with the corroded well database, the researchers developed a three-group corrosion protection experimental programme. The chemical drive experimental wells were fully coated; the fire drive experimental wells were categorised according to their corrosion levels, with the heavier wells being coated with a generalised double-sided carbon fibre coating, and the lighter wells being coated with a three-stage experimental measure of "coated column + normal column + coated column", so as to compare the results.

At present, the fire drive production well anti-corrosion tubular column experiment has been implemented six times, chemical drive experiment one well. Next, the plant will expand the promotion of anti-corrosion technology of tubular column coating to enhance the effect of two major development methods, namely fire drive and chemical drive, in order to provide guarantee for high and stable production of the oil production plant.