OVERVIEW | bakerhughes.com StimTunnel Targeted Acid Placement Service Create large, connecting tunnels for longer-lasting production gains with fewer impairments Applications nn New and existing oil and gas wells nn Openhole completions in carbonate reservoirs nn Naturally nn Short fractured carbonates or long openhole intervals nn Vertical, deviated, and horizontal wellbores nn Low- or high-matrix permeability nn Varied formation layer thicknesses Features and benefits nn Creates large, connecting tunnels from a main bore The patented Baker Hughes StimTunnel™ targeted acid placement service stimulates selected zones in carbonate reservoirs by creating large, connecting tunnels from an openhole main bore. This targeted stimulation method delivers improved, longer-lasting production gains with fewer production impairments. The combined effect of high-pressure jetting and chemical rock dissolution in acid generates a drilling effect that enables the StimTunnel tool to construct secondary tunnels away from the main bore. New tunnel trajectory and orientation can be downloaded from an optional memory inclinometer gauge incorporated in the tool string. The main advantage of the StimTunnel service is its ability to enlarge the reservoir inflow area of the well without having to frac the well or use conventional downhole drilling motors, drill bits, or expensive drilling muds. The service uses hydrochloric acid, which simplifies your operation by eliminating damaging by-products, drill cuttings, or drilling fluid management facilities onlocation: The only by-products generated by the acid reaction with carbonates are salt, water, and carbon dioxide, none of which will damage the well as polymers, lost circulation materials, and dispersants would in a conventional drilling operation. The StimTunnel service uses a dualknuckle tool, conveyed by coiled tubing, to kick off from the main wellbore at the desired target zone. The acid system exits highpressure jetting nozzles and creates –– Increases reservoir drainage area –– Increases and provides longer lasting production –– Bypasses near-wellbore skin damage –– Avoids stimulating adjacent water zones –– Reduces drawdown and associated water production nn Flexible, cost-effective system –– Uses widely available coiledtubing units and acid systems –– Requires less acid than conventional matrix techniques –– Compatible with acids and sour environments nn Acid-jetting array –– Constructs tunnels more efficiently nn Dual-knuckle design –– Produces optimum tunnel initiation and build nn Indexing feature –– Permits tunnel phasing OVERVIEW a large-diameter tunnel that typically extends between 20 and 100 ft. (6 to 30 m) into the formation. Acid that leaks off during the tunnel construction forms high-density, interconnected, wormhole clusters deep in the formation. The wormhole clusters improve connectivity and increase production. Multiple tunnels may be formed throughout the openhole section. Minimal surface equipment, such as a standard coiled-tubing unit and crew, pumping unit, and acid/mixing tank are required to perform a StimTunnel job. No blenders, frac equipment, or drilling rigs are needed. The StimTunnel service creates wormholes and tunnels that extend from the main wellbore and significantly increase surface drainage area. Technical Data Typical Specifications Nominal Tool Diameter (without nozzle)* in. 2.125 mm 54.0 Maximum flow rate Tool length in. mm Basic assembly 82 2.25 With memory inclinometer 102 2.60 With indexer 133 3.38 With indexing tool and memory inclinometer 134 3.41 Maximum operating temperature bbl/min L/min °F °C 2.5 400 300 149 *Nozzle sizes vary from 2.125 to 3 in. (54.0 to 76.2 mm) Disclaimer of Liability: This information is provided for general information purposes only and is believed to be accurate as of the date hereof; however, Baker Hughes Incorporated and its affiliates do not make any warranties or representations of any kind regarding the information and disclaim all express and implied warranties or representations to the fullest extent permissible by law, including those of merchantability, fitness for a particular purpose or use, title, non-infringement, accuracy, correctness or completeness of the information provided herein. All information is furnished “as is” and without any license to distribute. The user agrees to assume all liabilities related to the use of or reliance on such information. BAKER HUGHES INCORPORATED AND ITS AFFILIATES SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, PUNITIVE, EXEMPLARY OR CONSEQUENTIAL DAMAGES FROM ANY CAUSE WHATSOEVER INCLUDING BUT NOT LIMITED TO ITS NEGLIGENCE. © 2014 Baker Hughes Incorporated. All rights reserved. 31603 REV. 08/2014