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The key engineering technology and industrial application project of high water-cut oilfield enhanced oil recovery completed by Sinopec Shengli Oilfield Branch and China University of Petroleum (East China) won the second prize of the 2020 National Science and Technology Progress Award
.
The project breaks through the engineering technical bottleneck of high water-cut oilfields to enhance oil recovery, provides technical support for the exploration and development of high water-cut oilfields, leads the development direction of oil production engineering technology in high water-cut oilfields, and becomes a killer for the sustainable and high-quality development of old water-flooding oilfields.
In old oil fields that have entered the development stage of high water cut and ultra-high water cut, for every 10 tons of liquid produced from the ground, more than 9 tons are water
.
"Although the water content of Shengli Oilfield is high, the overall recovery rate is only 30%, and the remaining oil has a great potential for tapping
The Shengli Oilfield 12 years ago faced prominent contradictions such as complex oil-water relations, increased heterogeneity, and serious damage to oil-water wells
.
The core restricting factor for enhanced oil recovery is oil production engineering technology.
In 2009, Shengli Oilfield began to lay out the innovation and research and development of key engineering technologies for enhanced oil recovery in high water-cut oilfields
.
The project has 3 core technologies.
In the past, Shengli Oilfield deployed more than 700 adjustment wells and renewal wells every year, but after it was put into production, the water cut was high and the sand production was serious
.
After the application of selective water plugging and sand control integrated well completion technology, the situation was reversed, the average water cut of new wells was reduced by 17.
Thin interbedded oil reservoirs have thin oil layers and thin barriers.
Some barriers are only 0.
5 meters, just like a layered cake; deep, low-permeability reservoirs have high temperature and high pressure
.
This brings many difficulties to subdivision water injection to improve oil recovery
The rapid diagnosis of well conditions and the downhole hydraulic workover technology consists of two technologies: electromagnetic/video combined rapid diagnosis and hydraulic workover.
It is like a "CT + gastroscope" for oil wells, which can not only diagnose oil well problems in all directions and without blind spots.
, It can also provide workover solutions to restore 82.
9 million tons of out-of-control reserves
.
The project has accumulated more than 90,000 well-times in the Shengli high-water-cut oil field, and the natural decline rate has dropped from 13.
6% to 9.
37%.
The oil has increased by 15.
46 million tons, and the newly-increased profit in the past three years is 5.
803 billion yuan
.
The project also directly contributed 1.
From Shengli Oilfield to Bohai Oilfield, Jianghan Oilfield, Jidong Oilfield, Zhongyuan Oilfield, Yumen Oilfield.
.
.
This project has become the leading engineering technology for the development of high water-cut oilfields
.
In the next step, they must move towards informatization and intelligence
.
"At present, the intelligent layered injection and mining technology has entered the scene
