Novel corrosion and scale inhibitor and preparation method thereof

Abstract

The invention provides a novel corrosion and scale inhibitor and a preparation method thereof. The novel corrosion and scale inhibitor comprises a corrosion inhibitor, a scale inhibitor and etidronic acid with the mass ratio of (0.1-1):(1-90):(0.1-10), wherein the corrosion inhibitor is a compounded corrosion inhibitor and comprises the following raw materials: oleic acid, diethylenetriamine, a quaternary ammonium reagent, and a compound; the compounded corrosion inhibitor is prepared by the following steps: obtaining imidazoline intermediates through the reaction between the oleic acid and diethylenetriamine; reacting with the quaternary ammonium reagent and obtaining an imidazoline quaternary ammonium salt corrosion inhibitor; finally, adding the compound and compounding to obtain the compounded corrosion inhibitor. The invention further provides the preparation method of the corrosion and scale inhibitor. The novel corrosion and scale inhibitor provided by the invention has the function of inhibiting corrosion and scale simultaneously and can effectively solve the problem of oilfield water scaling in the field of oil fields.

Description

technical field [0001] The invention relates to a novel corrosion and scale inhibitor and a preparation method thereof, belonging to the technical field of petroleum exploitation and environmental protection materials. Background technique [0002] In the field of oilfields, the essence of scaling is that the oilfield water becomes supersaturated, and one of the salts can no longer dissolve. Scaling occurs. Scaling in oilfield water often causes problems such as stuck oil well pumps, blocked annulus between well pipes and sucker rods, sharply reduced inner diameters of gathering and transportation pipelines, and even severe blockages, seriously affecting oilfields. Production is going on as normal. [0003] At present, the methods of controlling oilfield water scaling can be mainly divided into chemical methods and physical methods. Chemical antiscaling methods include ion exchange softening method, lime softening method, acid addition method, CO 2 Method, adding antiscal...

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Problems solved by technology

Although antiscalants used in oil fields can effectively reduce the formation of scales, generally antiscalants are acidic reagents, and acidic reagents will corrode the pipe string, and the large amount of ions in the formation water will also corrode the pipe string, which will seriously Affect the service life of the pipe string and the production efficiency of the oil field