Field Applications of an evaluation model for enhancing recovery efficiency to polymer-flooding
- Dandan Hu (China Natl. Petroleum Corp.) | Yuanqian Chen (China Natl. Petroleum Corp.) | Yuanbing Wu | Qingfei Zhao (SINOPEC Company Ltd,) | Mingsheng Feng (China Natl. Petroleum Corp.) | Hui Liu (RIPED, PetroChina)
- Document ID
- Society of Petroleum Engineers
- SPE Enhanced Oil Recovery Conference, 19-21 July, Kuala Lumpur, Malaysia
- Publication Date
- Document Type
- Conference Paper
- 2011. Society of Petroleum Engineers
- 4.3.4 Scale, 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex), 2.5.2 Fracturing Materials (Fluids, Proppant), 5.4.1 Waterflooding, 5.7.2 Recovery Factors
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Polymer flooding development tests stared from 1990's were carried out on Daqing and Shengli oilfields in China, with water-flooding as its most important development measures formerly, which enlarged size scale of tests continuously. Stable production and enhancing recovery efficiency in these oilfields were implemented by polymer flooding technology. Successful field applications showed the yearly production rate reached to nearly 90 million bbl in Daqing oilfield.
Feasible and effective report has not been provided yet on the problem that the range of recoverable reserves and recovery efficiency can be reached after polymer flooding. Considering most oilfields accomplished polymer flooding in quick succession and some oilfields were just developed by polymer flooding, practical resolution should be recommended such as the corresponding evaluation model for enhancing recovery efficiency range of polymer flooding. The resolution can also provide an evaluation basis of enhancing recovery efficiency for alkaline-surfactant-polymer flooding in future.
This paper proposed an evaluation model for enhancing recovery reserves and recovery efficiency of polymer-flooding based on production decline model of reservoir engineering. Applications of these concepts are illustrated with field examples. Results indicated that recovery efficiency by polymer-flooding after the water-flooding development may be increased between 7% and 12% in Chinese oilfields. The evaluation model has been used effectively to predict EOR effect in Chinese oilfields.
It is generally believed that water-flooding development is an important measure for maintaining reservoir pressure and enhancing oil recovery efficiency of oilfields. However, oil production decline in oilfields is unavoidable when they have entered the development stage with mid-high water cut. For the purpose of keeping stable oil production rate, reducing production decline and enhancing recovery efficiency, it is the best choice to implement polymer-flooding plan in favorable developmental blocks. The first polymer-flooding development test started from 1990s was carried out on La-sa-xing in Daqing oilfield, with water-flooding as its most important development measures formerly, which enlarged size scale of tests continuously. Up to now, about 43 blocks have been conducted by polymer-flooding development and yearly production rate in six successive years nearly 90 million bbl has been achieved. Currently, some of polymer-flooding development blocks have been basically terminated or transferred into post-water-flooding, and some new blocks are put into polymer-flooding development subsequently. Thus, evaluation of enhanced recovery efficiency for polymer-flooding has become a realistic problem needed to be solved rapidly. It also establishes the foundation for evaluation of enhanced recovery efficiency when Alkaline-Surfactant-Polymer flooding is implemented in future. This paper proposed evaluation model for incremental recoverable reserves and recovery efficiency, effectiveness and applicability of the evaluation model was verified with practical examples.
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