The surface remanufacturing technology of the water injection pump is studied and applied in Changqing Oilfield. The service life of the remanufactured pump plunger and the combined valve can reach more than 1.5 times that of the original product, and the cost of remanufacturing is about 40% lower than the new purchase cost, and the purpose of reducing the cost and increasing efficiency is achieved.

In accordance with the unified deployment of Changqing Oilfield, under the direct guidance of the oil field equipment, the oil and Gas Technology Research Institute, under the direct guidance of the oil field equipment, takes the new technology introduction and optimization as a means to reduce the equipment material more change and the repair and reuse of the water injection pump components. Through extensive market research, the remanufacturing process of "laser cladding + nickel base / iron base alloy" is formed through extensive market research. This process is used to repair and reuse the waste combined valve and plunger of water injection pump, prolonging the service life, reducing the development cost of the oil field, and the economic benefit of the field application is obvious. In July this year, with the announcement of the remanufacturing center of Changqing Oilfield, the remanufacturing effort was clearly strengthened, and the repair and utilization of the water pump was included in the remanufacturing focus. Since then, the whole remanufacturing work in Changqing Oilfield has had strong driving force and mechanism guarantee.

At present, the Changqing oil-gas Technology Research Institute has applied for 4 patents for water injection pump remanufacturing technology, issued 2 standards, and published 2 papers in core journals. It is estimated that if the technology of water injection pump remanufacturing is applied in the whole oilfield water injection system, the cost of material replacement can be saved more than ten million yuan annually.