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PRODUCTS
STUMGUN™
 Printable Flier
STIMGUN™ and STIMTUBE™ Tool Assembly Manual-
Please contact Mike Miller; mike.miller@corelab.com at Owen Oil Tools for assistance.
The STIMGUN™ assembly used in the Mara-Stim
process employs a cylindrical sleeve of gas generating
propellant that is simply slid in place over the
outside of conventional hollow steel carrier
perforating guns. It can be run on wireline or in a
tubing conveyed configuration. The propellant is
ignited by the pressure and shock wave of the shaped
charges as they penetrate the gun, casing and
formation. The propellant sleeve, on initial
inspection, would appear similar to a piece of PVC
pipe held in position by slightly larger end subs on
the carrier. The technical design, of the propellant
sleeves, is complex, which ensures a consistent
ignition and burn rate.
Click
Here for more information on STIMGUN™ in pdf format.
Mara-Stim(SM) is a service mark, and STIMGUN™ is a trade mark of Marathon Oil Company. http://www.marathon.com.
View our STIMGUN™ demonstration movie in Quicktime (8.9 MB) - Click Here to
Download
HDSR - Owen High Speed Data Recorder
Click Here for
More
Info
Mara-Stim
Process
 Any conventional deep penetrating or big hole shaped charge can be utilized with the STIMGUN™ assembly. A special KISS™charge has also been developed for use in soft formations. A larger diameter hold is produced with penetration designed just to "KISS" the formation after passing through the cement sheath. The perforating gun is detonated by conventional, electric line, or tubing conveyed firing techniques.
 When the shaped charge is detonated, the
propellant sleeve is ignited within an instant, producing a burst of high
pressure gas. The high pressure gas enters the perforation and breaks
through any damage around the tunnel, creating fractures. In hard rock,
fractures are estimated to extend as much as three to six feet from the
wellbore.
 When the gas pressure in the wellbore dissipates, gas in the formation is surged into the wellbore, carrying damaging fines away from the formation. Mara-Stim(SM) is a service mark, and STIMGUN(TM) is a trade mark of Marathon Oil Company. http://www.marathon.com
Cylindrical Sleeve
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The STIMGUN™ assembly used in the Mara-Stim process employs a cylindrical sleeve of gas generating propellant that is simply slid in place over the outside of conventional hollow steel carrier perforating guns. It can be run on wireline or in a tubing conveyed configuration.
The propellant is ignited by the pressure and shock wave of the shaped
charges as they penetrate the gun, casing and formation. The propellant
sleeve, on initial inspection, would appear similar to a piece of PVC pipe
held in position by slightly larger end subs on the carrier.
The technical design, of the propellant sleeves, is complex, which
insures a consistent ignition and burn rate. |
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Pressure Response - Fast Gauge Data from the StimGun™ Assembly
The ultra-fast recorder
monitors the pressure response of the perforating event and propellant
burn. The data can be compared to a computer model for validation of the
model and to estimate rock properties. In at least some wells, the
fracture gradient can be estimated from this data. One of the most
important use of the ultra-fast pressure gauge data is to determine proper
execution of the job. It is possible to see the perforating event, the
propellant ignition, and the rate and magnitude of the propellant burn.
This data has led to the successful development of the tools and
procedures currently being employed. The ultra-fast recorder has the
capability to measure 100,000 g's of shock load. This recorder, developed
specifically for these oilfield applications, came from military
technology. Pressure, acceleration, and strain data can all be obtained.
Development Team Mission Statement
"To develop successful application of
propellant technology for the oil
and gas industry;
to maintain safety
as the
highest priority;
to establish
a high trust relationship
with the industry, our customers, and
each other; to
build profitable business
opportunities for the
stakeholders of
the technology."
Developed By:
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Marathon Oil Company
5555
San Felipe Houston, Texas 77253 Phone: (713) 629-6600 Fax:
(713) 629-2952 Internet: http://www.marathon.com
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Owen Oil Tools 12001 CR 1000
Godley, Texas 76044 Phone: +1 817 551 0540 Fax: +1 817 551 0795
E-mail: mike.miller@corelab.com
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HTH Technical Services, Inc.
5983 Valley Street Coeur d'Alene, Idaho 83814 " Phone: (208)
772-5970 Fax: (208) 772-5970 E-mail: joe@stimgun.info
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John F. Schatz Research &
Consulting 4636 South Lane Del Mar, CA 92014 Phone:
(858) 792-7410 Fax: (858) 481-0357 E-mail: jschatz@jfsrc.com
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