Hanging pump used in gas injection wells in the Tahe Oil Field

Hanging pumps have been applied in wells TK7-633CH2, TK672, TK644 and TH12147 in the Tahe Oil Field. Generally there are three ways:(1) using active rods which can move up and down; (2) using acid fluid to remove blockage; and (3) adding pressure in oil tubes. Active rods which can move up and down can remove the blockage between plunger and pump barrel, and help plunger into pump barrel. Oxygen causes the corrosion and blockage of pipe string during gas injection. Acid fluid is used to wash and remove blockage. Soak cleaning with acid fluid will destroy rod, pump and pipe, hence should be avoided. We can add pressure to help plunger into pump barrel when it is blocked. The first round of hanging pump is usually difficult while the second and third rounds are easier. Old pipes often fail in hanging pump production. The second round of acid fluid washing shows a low success rate. Pumps with higher power are recommended.