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Standards Development
This document specifies the instruments and equipment, testing methods, and inspection rules for the detection of polymer microsphere products. It provides the content and requirements for performance testing of polymer microspheres. It is applicable to the performance testing of nanometer, submicron and micrometer sized polymer microspheres.
Polymer microspheres flooding is a key enhanced oil recovery technique. It has demonstrated good adaptability and effectiveness in global water injection development oilfields. This technology injects polymer microspheres into the reservoir through water injection wells. Through the hydration expansion effect, the polymer microspheres could gradually transport and block in the advantageous flow channels, effectively expanding the swept volume of injected water, stabilizing oil and controlling water, and improving recovery efficiency. As the core product of this technology, polymer microspheres are mainly polymer micro gel particles, which are prepared by inverse emulsion polymerization, inverse micro-emulsion polymerization and precipitation polymerization. The rich product sequence ensures that this technology is applicable to various types of water injection development reservoirs.
The polymer microspheres are uniformly dispersed emulsion system. The effective component is spherical with effective content in the range of 15%~35%. The initial particle size is from 50 nm to 10000 nm. It can quickly and evenly disperse in the oilfield injection water, then migrate to deep pores of reservoir to form aggregates, so as to effectively block the advantageous flow channel and expand the swept volume of injection water. This product has advantages of good injectability, strong shear resistance, high temperature and salt resistance and simple injection process. This system has shown good adaptability in reservoirs with different permeabilities. It has been in large-scale application in Changqing Oilfield, Huabei Oilfield and Bohai Bay Oilfield of China, Basca Oilfield in Canada, North Sea Oilfield in Europe, Gulf of Mexico in the United States, and Gorgon Oilfield in Australia, with an annual application of up to 5000 wells and broad prospects for promotion and application.
In the application process of polymer microspheres products, there are various types of polymer microspheres products used for different types of oil reservoirs. There are inconsistencies in the detection instruments, experimental cores, experimental conditions (temperature, salinity, etc.), experimental standard steps, experimental evaluation indicators, and detection result processing methods, which affected the test results of microspheres performance and the accuracy of engineering design and application evaluation. It is necessary to establish a unified testing method to standardize the use of polymer microspheres. At present, there is a lack of unified standards or specifications for product testing methods of polymer microspheres. The establishment of this standard will effectively fill the gap of international standardization in particle based agent for chemical flooding, which is an important means of regulating and improving the level of technical research and application.
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