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Abstract

Summary

The low sweep efficiency of ongoing water flooding in many mature oilfields is attributed to huge permeability contrast or existing high-permeability streaks. Using polymer-based conformance control treatment can be the only viable option to improve oil recovery in many water flooding projects. There are many chemical agents that are developed and used for sandstone formations. However, for the carbonate reservoirs, often characterized by low permeability, fractures, high salinity and temperature, only a limited number of IOR field trials is reported.

The polymeric nanospheres is conformance control agent improving oil recovery through redistribution of water flows deep in a reservoir. The nanospheres are expanding in size after injection into the formation, and swelling period is well controlled. Different classes of nanospheres were developed for various reservoir conditions. Nanospheres are less impacted by geological conditions when compared to other chemical agents and can be used in reservoirs with very high temperatures (upto ∼130°C) and high salinities (upto ∼300,000 mg/l).

There is a long history of application of this agent in sandstone formations that will be briefly reviewed in the paper. Nanospheres have been effective in the reservoirs with permeability as low as 0.1 mD.

Recently, the extensive experimental study was conducted to analyze primarily: a) interaction of carbonate rock and nanospheres (through zeta potential), and b) effect of nanospheres on oil displacement in carbonate cores.

The paper presents evaluation results showing that water quality composition has a great influence on the electrical properties of carbonate rock and nanospheres. In two extreme cases of evaluation (de-ionized water and highest-salinity brine), nanospheres have a uniform charge with rock surface, and there is mutual repulsion that means reduced adsorption on the rock. The positive impact on oil production has been also demonstrated.

Field trial and injectivity tests are essential to de-risk polymer-based IOR technologies.

After the laboratory evaluation the field trial in carbonate reservoir has begun. The nanospheres solution have been injected in two wells. The pilot design included different concentrations and injection rates that were selected after careful review of geological features and ongoing water injection results. The positive impact on watercut and oil rate in producing wells has been reported and confirmed. Furthermore, no loss in injectivity has been observed. This work and field trial can enable the water flooding improvement in carbonate reservoirs through novel IOR method. Besides, nanospheres injection prior to conventional polymer flooding can significantly improve the performance of latter.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.202133069
2021-04-19
2024-04-27

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.202133069
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One Approach to Waterflood Conformance Control in Carbonate Reservoirs
Conference Proceedings 2021, 1 (2021); https://doi.org/10.3997/2214-4609.202133069
/content/papers/10.3997/2214-4609.202133069
/content/papers/10.3997/2214-4609.202133069
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