Multifunctional water treatment agent for oilfield reinjection water

Abstract

The invention relates to a multifunctional water treatment agent for oilfield reinjection water. The water treatment agent comprises the following components in percentage by weight: 13 to 27 percent of scale inhibition component consisting of 8 to 15 percent of polymaleic anhydride and 5 to 12 percent of sodium gluconate, 21 to 41 percent of corrosion inhibition component consisting of 15 to 25 percent of imidazoline derivative A, 3 to 8 percent of organic amine salt and 3 to 8 percent of polyethylene oxide octadecylamine, 18 to 40 percent of sterilization component consisting of 10 to 25 percent of alkyl quaternary ammonium salt and 8 to 15 percent of imidazoline derivative B, and the balance of deionized water. The water treatment agent is suitable for treating the oilfield reinjectionwater in an oxygen-free system, and also has a good effect on reinjection water containing CO2 and H2S; and the reinjection water is not required to be pretreated, and only the prepared multifunctional water treatment agent is needed to be added into a pipe network of a reinjection water system according to required concentration.

Description

technical field [0001] The invention relates to a water treatment agent. In particular, it relates to a multi-functional water treatment agent for oil field reinjection water with functions of sterilization, scale inhibition and corrosion inhibition Background technique [0002] At present, most oilfields in my country have adopted the water injection development method. On average, about 2t-3t of water is required to produce 1t of crude oil, which increases the water content of crude oil and greatly increases the amount of sewage separated during crude oil treatment. The crude oil produced in my country's oil fields contains 70% to 95% water, and the ratio of oil to water is gradually increasing. In multiple oil recovery in oil fields, the liquid produced from the oil well is separated from the oil and water phases by the separator, the oil phase is transported to the oil transfer station, and the water phase is transported to the sewage treatment station. In the sewage t...

AI Technical Summary

Problems solved by technology

[0005] However, the current oilfield water treatment agents still have a series of problems: for example, with the research and development of oilfield slow-release agents, it is found that it is difficult to achieve a satisfactory corrosion inhibition effect by relying on only one component, and the corrosion inhibitors used in the oil industry are often used It is the compounding of several corrosion-inhibiting ingredients according to a certain ratio, and the corrosion-inhibiting rate is improved through the synergistic effect

In addition, in the treatment of oilfield reinjection water, the additives added may include various agents such as scale inhibitors, corrosion inhibitors, bactericides, and water purifiers; however, whether it is a single agent compound or a combination of multiple agents , the more chemicals in it are used, the more difficult it is to adapt between the drugs, which hinders the normal function of the drugs