Oilfield reinjection water scale inhibitor and preparation method thereof

Abstract

The invention provides an oilfield reinjection water scale inhibitor and a preparation method thereof. The scale inhibitor consists of styrene sulfonic acid (SSS), polyepoxysuccinic acid (PESA), polyaspartic acid (PASP) and 2-phosphonic butane-1,2,4-tricarboxylic acid (PBTC), wherein the mass ratio of the SSS, PESA, PASP and PBTC is (30-50):(15-25):(20-30):(5-10). The invention provides the preparation method for the oilfield reinjection water scale inhibitor. The four materials are sequentially added into a stirring container at a certain mass ratio, stirred and dissolved to obtain the scale inhibitor. The scale inhibitor is a super concentrated liquid agent, and can be infinitely diluted for use. The four materials are compounded at a certain mass ratio, so that the scale inhibiting effect of the scale inhibitor is obviously superior to that of a single material; the consumption of the scale inhibitor is lower than that of any domestic existing oilfield reinjection water scale inhibitor, so that the agent cost of oilfield development can be saved. The oilfield reinjection water scale inhibitor disclosed by the invention has a stable hydrolysis effect under the condition of high hardness, high alkalinity and high temperature, an excellent scale inhibiting dispersion effect on calcium carbonate and calcium phosphate and good effects of dispersing iron oxide and stabilizing zinc salts, so that the scale inhibitor can be widely applied in the field of oilfield reinjection water and conventional water treatment and the like.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to an oilfield development water treatment agent, in particular to an oilfield reinjection water scale inhibitor and a preparation method thereof. Background technique [0002] At present, most oilfields in my country have adopted the development method of water injection to supplement energy. There are usually three kinds of oilfield injection water: one is clear water, that is, shallow groundwater in oil areas; It can be re-injected into the oil layer; the third type is seawater; there are also mixed injections of different waters. Some foreign oilfields such as North Sea oilfield generally adopt the method of seawater injection. As the injected water advances to the oil well, the water content of the oil well continues to rise, which eventually leads to serious fouling in the near-wellbore area of ​​the oil well, wellbore of the oil production well, downhole equipment, surface pipe...

AI Technical Summary

Problems solved by technology

Scaling usually causes blockage of production pipelines or equipment, increases the number of workover operations, and shortens the cycle of workover operations; at the same time, fouling can also easily cause blockage of oil layers, decrease in fluid production and waste of energy, hindering the normal production of crude oil, and in severe cases It will cause the sucker rod to be broken, the oil well will be shut down, or even scrapped, causing great economic losses