Finally there are mechanical skimmers - ideal for retrieving heavy oils - which use metal tooth discs, grab buckets and drum separators to remove the oil then pump it into a tank.
The bending of pump barrel will not happen as low part fixed pumping piston going downward that only happens when it works in heavyoil well.
而泵筒下部固定泵柱塞上行时，泵筒不会发生弯曲，只是其柱塞在稠油井中下行时泵筒才会发生纵向弯曲。
3
Active water or light oil is sent downhole through hollow rod to reduce oil flow resistance, thus producing heavyoil from deep formation through screw pump.