Pressure-reducing and injection-enhancing anti scaling agent for low-permeability water-injection well and preparation method thereof

US10800963B2 · kind B2 · utility

Assignee

• PetroChina Company Limited · CN

Inventors

• Lei Sui · Beijing, CN
• Suiwang Zhang · Beijing, CN
• Xiaobing Lu · Longbeilingcun, CN
• Hongjun Lu · Beijing, CN
• Lijun Mu · Beijing, CN
• Yong Wang · Jinan, CN
• Zhaojie Song · Beijing, CN
• Zhiying Deng · Beijing, CN
• Erzhen Wang · Beijing, CN

Key dates

• Filing date: Dec 29, 2017
• Grant date: Oct 13, 2020
• Expiry date: Mar 14, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2208/32
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present disclosure provides a pressure-reducing and injection-enhancing anti-scaling agent for low-permeability water-injection wells and a preparation method thereof. The anti-scaling agent is prepared from starting materials comprising: 10 to 12 parts of non-ionic surfactant(s), 18 to 20 parts of hexasodium triethylenetetramine-N,N,N′,N″,N′″,N′″-hexaacetate, 5 to 8 parts of anionic surfactant(s), 6 to 8 parts of an organic phosphonic acid-carboxylic acid scale inhibitor, 2 to 5 parts of a dispersant, 15 to 18 parts of a diluent, 8 to 10 parts of an organic amine salt, and 30 to 36 parts of water. The pressure-reducing and injection-enhancing agent according to the present disclosure is characterized by having multiple functions in one agent. When used in an amount being 0.5% of the water injected to a water injection well, it shows excellent anti-swelling property, shrinking property, anti-corrosive property, and calcium sulfate and barium (strontium) sulfate scale resistance.