Shengli 2 block of Shengli Oilfield SP combination flooding project is the National 863 project “high temperature and high salinity reservoir pilot project”.The reservoir temperature is 83℃, salinity is 25 thousand and the comprehensive water content is up to 98%.These all belongs to the difficulties that appeared in the tertiary oil recovery.So the requirement of the temperature resistance and salt resistance of polymer and surfactants are much more higher.
The group relies on a strong team of experts in the field of surfactant research and development. The developed anion nonionic system surfactant products that are suitable for the development and use of high temperature and salinity reservoirs.The anti mineralized degree is 100-200thousand and the temperature resistance can be up to 110℃.
From January 2009 to January 2013, the water cut fell from 97.2% to 90.8%. From January 2009 to January 2013, the daily oil production increased from 24m3/d to 76m3/d Technical principles and advantages .
The SP combination flooding technology is a method of increasing the oil recovery significantly by injecting surfactant for EOR on the basis of polymer flooding.
From the successfully implemented SP combination flooding projects,the recovery rate generally increased about 10%.the two element composite projects have been implemented in China, the recovery rate generally increased by about 10%, compared with the single polymer flooding, The SP combination flooding can increase the recovery rate about 5%. And it also has obvious advantages when compared with ASP combination flooding on technology and sustainability.
Our company is one of the earliest enterprises that took part in the research of the SP combination flooding.The company established a perfect data model of stratigraphic rock oil-displacing,accumulated hundreds of surfactant products and form different characters of surfactant systems.
We build different active agent systems that can meet the needs of different conditions through researching various types and properties of reservoirs all over the country.
1.Surfactant for oil displacement of high temperature and high-salt reservoir
2.Negative nonionic system
3.Active agent system for offshore oil field
4.High salinity seawater oil displacement system of CNOOC
5.GaoLiqing High temperature (120℃) heavy oil system of HuaBei Oilfield
6.High wax content and extra-high mineralized water system of ZhongYuan Oilfield
Scope of application:
The technology of SP combination flooding is suitable for the high water cut late stage of water injection development or reservoirs after polymer flood. And the reservoirs that have perfect injection-production system,favourable well conditions and complete logging,core,fluid properties and dynamic data of water injection development have more prospects for promotion.
