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  1. STIMULATING SHALES-CONCLUSION EXPERIENCE REVEALS BETTER BAKKEN STIMULATION TECHNIQUES

    Magazine Articles

    Mon, 29 Apr 1991

    initially stimulated with 5,000 gal of 20% HCl acid and 15,000 gal of emulsified 28% HCl acid. This job increased production from 12 bo ..... treatment. The upper shale is almost inert in HCl acid, and the fracture created during the acid

  2. Alternative methods clean up filter cake

    Magazine Articles

    Mon, 1 Feb 1999

    Specifically, alternatives to hydrochloric acid ( HCl ) treatments must be considered in regard to the damaging effect HCl can have through the generation of residues ..... study on conventional external breakers, HCl was compared to alpha amylase enzyme, sodium

  3. Technology advances boost horizontal openhole gravel packing

    Magazine Articles

    Mon, 8 Jul 2002

    magnitude slower than with hydrochloric acid ( HCl ). Also one can control removal times by ..... contact points, a common occurrence with HCl . In these cleanups, another significant ..... CAS but increase from 150 to 250 æm with HCl treatments. This adversely affects sand

  4. Mineralogy-based acid design restores sandstone productivity

    Magazine Articles

    Mon, 21 Jun 2004

    are known to be unstable in hydrochloric ( HCl ) acid, depending on their composition and the temperature. Pumping strong HCl into a sandstone formation above the stability ..... matrix permeability during pumping.4 Also HCl and acetic acids, by themselves, will

  5. COILED TUBING - Conclusion: BP develops guidelines for 16Cr CT

    Magazine Articles

    Mon, 17 Jul 2006

    commonly used on the North Slope, including HCl and mud acid. Inhibition loading for chrome ..... cost increase is 20% and 31% for 15% HCl acid and 9:1 mud acid, respectively ..... test has been completed with 50 bbl of 10% HCl and standard corrosion inhibition (no

  6. Optimized stimulation strategies enhance Aramco gas production

    Magazine Articles

    Mon, 4 Oct 2010

    treatment consisted of high-temperature 28% emulsified HCl acid and in situ gelled HCl acid. The planned job had four pad stages between ..... the well treatment included 10,000 gal of 15% HCl . The poststimulation rate was excellent, about 30

  7. Corrosion problems solved in CT nitrogen operations off Brazil

    Magazine Articles

    Mon, 15 Sep 2008

    hydrolysis, creating hydrochloric acid, HCl (H + + Cl - ), as shown in Equations 3 ..... the corrosion process because the formed HCl begins to attack the metal, as shown in ..... the string was pickled with 5 bbl of 5% HCl with the BHA still in place. We removed

  8. TECHNOLOGY Solvent removes downhole NORM-contaminated BaSO 4 scale

    Magazine Articles

    Mon, 22 Apr 1996

    1984, was a gelled acid wash and squeeze with 15% HCl and gelled 28% HCl . Subsequent treatments included a nitrogen squeeze ..... As predicted, the scale showed no solubility in 15% HCl and 12% HCl -3% HF. A pretreatment gamma ray spectroscopy

  9. In situ gels improve formation acidizing

    Magazine Articles

    Mon, 20 Jan 1997

    surface, leaving the interval free of damage. Typically, VCA for matrix acidizing contains 3-5% HCl . The HCl -only stages are typically 15-28% HCl . Fracture acidizing Fracture acidizing is only applied to carbonate reservoirs, such as limestones

  10. TECHNOLOGY Coiled tubing facilitates deep underbalanced workover

    Magazine Articles

    Mon, 31 Mar 1997

    use acid for dissolving the particles. An HCl acid package, 15% by volume, was selected ..... blended in an acid system consisting of 15% HCl , acetic anhydride, foaming agent, and ..... coiled tubing spotting 2,000 gal of 15% HCl acid across open hole. Displace coiled

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