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Standards Development
This standard specifies the experimental procedures, dissolution amount, and physical property tests and calculations for carbonate rock dissolution performance using core flooding method. This standard is applicable to the test and evaluation of dissolution properties of carbonate rock samples.
Global carbonate natural gas resources are abundant, widely distributed in Qatar, Iran, Saudi Arabia, Russia, the USA, China, Brazil, and Indonesia. According to the data released by the US Energy Information Administration in 2013, the recoverable reserves of Marine carbonate rock formations have been found in the world to be 120 trillion cubic meters, accounting for 36.7% of the total recoverable natural gas in the world. Carbonate dissolution is a key criterion for evaluating and developing highquality natural gas reservoirs. Identifying large-scale dissolution pores is crucial for successful carbonate rock natural gas exploration. In addition, designing effective acidification methods is key to achieving high productivity during development. Carbonate rock dissolution performance testing experiments play a vital role in determining the main controlling factors of dissolution pore formation and quantitatively evaluating the effectiveness of acidification. Particularly, the results of core flooding experiments provide scientific guidance for efficiently exploring and developing carbonate rock natural gas. Core flooding experiments simulate the transport of fluids in the pores of rocks and the water-rock reactions under underground temperature and stress conditions using plug samples. These experiments provide a quantitative evaluation of carbonate rock dissolution-induced porosity and permeability enhancement. However, the lack of unified international standards for such experiments results in differences among institutions in sample size, testing procedures, and evaluation parameters. Such disparity makes it difficult to compare and validate the results across different tests. Therefore, a unified international standard will promote sharing and mutual recognition of data, and facilitate the execution of international cooperation projects, ultimately enhancing the efficient exploration and development of carbonate rock natural gas.
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