Release Details

MIDLAND, Texas, April 27 /PRNewswire-FirstCall/ -- Natural Gas Services Group, Inc. (Amex: NGS), a leading provider of equipment and services to the natural gas and oil industry, announces it plans to release its 2004 first quarter financial results on Tuesday, May 4, 2004. In conjunction with the release, the Company has scheduled a conference call Tuesday, May 4 at 3:15 PM Central Daylight Time.

     What:  Natural Gas Services 2004 First Quarter Financial Results
            Conference Call

     When:  Tuesday, May 4, 2004 - 3:15 PM Central Daylight Time

     How:   Live via phone by dialing 800-936-4602.  Code: Natural Gas
            Services.  Participants to the conference call should call in at
            least 5 minutes prior to the start time.

Wallace Sparkman, President & CEO, Natural Gas Services Group, Inc. will be leading the call and discussing first quarter financial results, the status of existing and new natural gas compressor leases and an outlook on the balance of fiscal 2004.

About Natural Gas Services Group, Inc

NGS manufactures, fabricates, sells, leases and services natural gas compressors that enhance the production of oil and gas wells. The Company also manufactures and sells flare systems and flare ignition systems for plant and production facilities.

For more information visit the Company's website at www.ngsgi.com .

Please contact Jim Drewitz, Creative Options Communications, 972-355-6070 with any questions regarding the conference call.

Certain statements contained herein are "forward looking" statements as such term is defined in the Private Securities Litigation Reform Act of 1995. Because statements include risks and uncertainties, actual results may differ materially from those expressed or implied and include, but are not limited to, those discussed in filings by the Company with the Securities and Exchange Commission.

     For More Information, Contact:
     Wallace Sparkman, President & CEO
     800-580-1828

     Jim Drewitz, Investor Relations
     972-355-6070

SOURCE  Natural Gas Services Group, Inc.
    -0-                             04/27/2004
    /CONTACT:  Wallace Sparkman, President & CEO of Natural Gas Services
Group, Inc., +1-800-580-1828; or Jim Drewitz, Investor Relations,
+1-972-355-6070, for Natural Gas Services Group, Inc./
    /Web site:  http://www.ngsgi.com /
    (NGS)

CO:  Natural Gas Services Group, Inc.
ST:  Texas
IN:  OIL OTC
SU:  CCA MAV

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