Technology Of Ultra-High Activity Negative-Cationic Surfactant Flooding Oil, Reducing Pressure and Increasing Injection

Crude oil is an important guarantee for national energy security, and in recent years, crude oil production has been below the security red line for four consecutive years, and the situation is grim. More than 60% of the remaining recoverable crude oil reserves in China are difficult to exploit in harsh oilfields. The development of new high-efficiency surfactants is the key to greatly improving the recovery rate of old oil fields and the utilization rate of proved resources.

The temperature and salt resistance of existing surfactants and their interface properties can not meet the requirements of harsh oilfield use. The mixed system of negative and cationic surfactants has ultra-high interface activity, but it is easy to form precipitation and liquid crystal, so far it has not been used in the industry at home and abroad. To this end, a new structure of negative non-ionic surfactants was invented, and on this basis, a series of negative and cationic surfactants with ultra-high interface activity, low adsorption, and pressure reduction, and injection were created by elucidation of the interaction mechanism, influencing factors and synergistic regulation.

The research results were awarded the 2016 China Patent Excellence Award, the 2018 China Petroleum and Chemical Industry Federation Technology Invention First Prize, and the 2019 China Petrochemical Group Technology Invention First.

◆ Temperature and salt resistant negative - non-ionic surfactant

Features: Temperature resistance up to 130℃, salt resistance up to 300,000mg/L NaCI, resistant to bivalent cations up to 20,000mg/L, can effectively take into account temperature and salt resistance and interfacial activity.

◆ Ultra-active negative-cationic surfactants

Features: The efficiency and effectiveness of traditional surfactants are 1-2 orders of magnitude higher. The interfacial the tension of oil and water reached 10-4Mn/m, the solubilization the parameter was >10, and the critical micelle concentration was <10mg/L.

◆ Low adsorption negative cationic surfactant

Features: Suitable for sandstone reservoirs with clay content up to 10wt%.

◆ In situ microemulsion system with reduced pressure and increased injection

Features: Suitable for reservoir temperature 130℃, permeability above 10mD high winter low permeability reservoir organic blockage relief.

In 2011, non-ionic surfactants with temperature and salt resistance began to be applied in high temperature and salt oil fields in Zhongyuan, with a cumulative increase of 37,000 tons and improved oil recovery 9.4%.

The ternary compound flooding technology formed on the basis of ultra-high active negation-cationic surfactants began to be applied in Henan high temperature, high water cut, and high production old oil fields in 2012, with a cumulative oil increase of 301,000 tons and improved oilrecovery 12.1%, reaching 65.5%, exceeding the Party Groups "challenge 60%" target.

In 2014, the low adsorption negative cationic surfactant was applied in the high clay and low permeability reservoir in the sandy area of Jiangsu oilfield, with a cumulative increase of 16,000 tons and an improved recovery rate of 8.0%.

In situ, microemulsion technology was applied in CNPC Jidong Oilfield and Sinopec Shengli Oilfield in 2016 and 2017 respectively, with a cumulative application of more than 100 Wells and a pressure reduction rate of more than 45%. The average validity period is 18 months, and the longest validity period is 3.5 years.

Hot Tags: technology of ultra-high activity negative-cationic surfactant flooding oil, reducing pressure and increasing injection, China technology of ultra-high activity negative-cationic surfactant flooding oil, reducing pressure and increasing injection manufacturers, suppliers, factory, Cu Zn Catalyst, chloride removal in catalytic reforming, activated alumina media, zeolites MCM 22, ZSM 23, Deoxidizer