Criteria to qualify a well for treatment includes:

• Wells that exhibit a high producing fluid level, limited by equipment, and are not pumped off, even at high total fluid rates.

• A high water-oil ratio, or (WOR).

• An indication of good remaining oil column or mobile oil saturation. A well which has oil buildup behind the tubing which can be flushed out by circulating the well is an excellent candidate.

• The well should be relatively high on structure.

• The well should have had a relatively high initial production rate, and a good cumulative production history, demonstrating a significant amount of original oil in place.

Ideal Formation Characteristics

• Carbonates (Dolomites & Limestones)

• Highly fractured (Naturally)

• High permeability contrast within produced interval

• Bottom water drive

Required Information for Treatment Design

• Production data (Current)

• Completion data (Open Hole or Perforated)

• Lithology (Carbonate or Sandstone?) (Naturally fractured) (Degree of permeability variation) (Contrast)

• Logs and core analysis if available

• Water analysis (Produced water)

• Reservoir temperature

Preparation for Treatment

• Proper cleanup is critical for success. (Acidize, Swab, Clean out Wellbore)

• Pull rods and tubing

• Test tubing (Steam clean if necessary)

• Run and set tension packer +/-1 joint above interval to be treated

• Acid job to clean up iron sulfide, scale, etc. (This step is critical to assure polymer injectivity into water-bearing zone)

• Pre-treatment gel scan with mixing water to determine chemical formulation

Treatment Procedure

• Injectivity Test - usually 2% Kcl water with premium biocide and surfactants

• Calibration of metering systems to deliver proper chemical formulation

• Start polymer injection-correlation of mixing systems

• Periodic sampling of mixture during treatment/quality control/determine gel times

• Treatment log-modified Hall plot-Monitor injection rate and pressure

• Moderate pressure buildup throughout treatment is desirable

• Excessive or rapid pressure response indicates plugging action (Reduce injection rates or terminate treatment)

• Oil post-flush with oil-soluble corrosion inhibitors and emulsion preventers

• Shut well in 3-5 days to assure maximum development of gel strength