Particle Drilling Technologies, Inc.  



Particle Drilling Technologies, Inc. began trading on the NASDAQ SmallCap Market, a leading nationally recognized electronic stock market, under the ticker symbol "PDRT" in June 2005.


Particle Drilling Technologies Added to the Russell Microcap Index

HOUSTON, June 30 /PRNewswire-FirstCall/ -- Particle Drilling Technologies, Inc. (Nasdaq: PDRT) today announced that it has been added to the Russell Microcap Index, which is being reconstituted today, June 30, 2006.

The Russell Microcap Index measures performance of the microcap segment, representing less than 3% of the U.S. equity market. The Russell Microcap Index includes the smallest 1,000 securities in the small-cap Russell 2000(R) Index plus the next 1,000 securities.

Particle Drilling Technologies, Inc., headquartered in Houston, Texas, is a development stage oilfield service and technology company owning certain patents and pending patents related to the Particle Impact Drilling technology. The Company's technology is designed to enhance the rate-of- penetration function in the drilling process, particularly in hard rock drilling environments.

Certain statements in this press release that are not historical but are forward-looking are subject to known and unknown risks and uncertainties, which may cause PDTI's actual results in future periods to be materially different from any future performance that may be suggested in this press release. Such risks and uncertainties may include, but are not limited to, PDTI's ability to raise equity capital, if necessary, and its ability to obtain equity financing on acceptable terms, if at all, a severe worldwide slowdown in the energy services sector, working capital constraints and other risks described in PDTI's filings with the SEC. Further, PDTI is a development stage company that operates in an industry sector where securities values are highly volatile and may be influenced by economic and other factors beyond PDTI's control such as announcements by competitors and service providers.

Contacts:
J. Chris Boswell, SVP & CFO
Particle Drilling Technologies, Inc.
713-223-3031 ext. 2085

Ken Dennard, Managing Partner
Jack Lascar, Partner
DRG&E / 713-529-6600