| Effects of Feldspar Content on Microstructure and
Property for High-Strength Corundum-Mullite Proppants |
Haiqiang Ma,1,* Chonggao Bao,1,* Yuming Tian2 and Guomin Li3
Pages : 18-22
DOI : 10.1080/0371750X.2019.1699863 |
| Abstract |
| High strength ceramic proppants are a significant factor during the hydraulic fracturing
process. Although many system ceramic proppants have been developed, their
strength remained relatively low. In this work high strength ceramic proppants have
been successfully prepared by solid state sintering at 1450oC using low grade bauxite
and varying contents of feldspar; XRD analysis revealed that the prepared ceramic
proppants mainly consisted of corundum and mullite phases. The effects of feldspar
content on the microstructure and properties of ceramic proppants have been
investigated. With the increase in feldspar content, the bulk density and apparent density
slightly declined and then remained steady, while the breakage ratio initially decreased
and then increased and achieved the lowest value (9.8%) for 4 wt% feldspar under
80 MPa closed pressure, which satisfied the requirement of Chinese Petroleum and
Gas Industry standard (SY/T5108-2014). The study can provide guidance for design of
high strength ceramic proppants to employ in low closed pressure oil and gas wells.
[Keywords: Ceramic proppants, Breakage ratio, Bauxite, Feldspar] |
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