BLEN-FYBER

Function

See page loss control additive. For use in oil and water muds.

General Description

Preferentially oil wettable, surface modified micronized cellulose fibers.

Product Benefits

Provides excellent seepage control without the expected large increases in rheology common to other cellulose fibers.
Good high temperature performance.
Effective secondary emulsifier in invert emulsions.
Biodegradable.
Good high temperature performance.
Effective secondary emulsifier in invert emulsions.
Biodegradable.

Product Description

Color: Light tan
Form: Finely divided, cellulose fibers
Specific Gravity: 0.9
Bulk Density (lbs./cu. ft.):
Uncompacted: 10-12
Compacted: 22-25
pH in Water (10 ppb): 6.5-7.5
Packaging: 25 lb. multi-ply bag with poly-inner liner.

Typical Treatment:

Blen-Fyber is used as a treatment for seepage losses in all mud systems. It may be used in pretreating the entire circulating system by adding 4-10 lbs/bbl. Maintenance will vary according to the formation and the amount of overbalanced pressure. Normal maintenance levels of treatment are only 3-6 sacks per tour.
Blen-Fyber can also be used through periodic sweeps, pills or slugs. In most cases, concentrations of 15-35 lbs./bbl. are recommended. This remedial approach can be used to obtain maximum sealing performance with the minimum of product cost and time.

Recommended Uses:

Unique seepage loss additive for oil and water mud systems.
May be used in high concentrations in oils or water as a high fluid loss/high solids squeeze to cure severe lost circulation.
Ideal for use in muds when drilling through depleted or normally under-pressured sands.
Excellent hole cleaner prior to running casing or logs.
Good mechanical hole cleaner to use while milling or cutting casing windows.

Case History 1:

In well being drilled at Taft, Texas, 9 5/8" casing was run and cemented at 8600'. The shoe was drilled out with an 8 ½" bit, and the water base mud was displaced with 12.6 ppg. oil base fluid.

At 11,150', 87 barrels of fluid were lost during a bit trip. When drilling resumed, losses amounted to an average of 8 bbl./hr. The decision was made to sweep the hole periodically with 25 lbs./bbl. of Blen-Fyber added to 25 barrels of whole mud. Losses were reduced to 1 ½" bbl./hr. while drilling and only 6 barrels were lost on the next trip.

Note: Mud weights could not safely be reduced due to an above average background gas and marked increases in connection gas.

Case History 2:

Well had been drilled to T.D. but encountered a fracture in the casing along a natural fault line. Operator cemented hole and cut window to sidetrack back to target zone. An invert emulsion mud was used initially out the window until extreme problem conditions were encountered. The well was intermittently experiencing lost circulation (into fault zone) and heavy salt water flows. The decision was made to displace the oil mud with a specially designed lignosulfonate mud system.

The particular conditions that the lignosulfonate mud was designed to overcome were (1) sensitive shales, (2) low pressure sands, (3) interlying high pressure stringers, (4) natural fault zone, and (5) potential salt water flows.

The lignosulfonate mud system was treated with 4 lbs./bbl. of Super-Slide Glass Beads, 4 lbs./bbl. of Blen-Fyber, and 6% #2 diesel oil. These materials were used in this system to prevent excessive seepage loss and differential sticking in the low pressure zones. Oil wet filter cakes were designed to minimize borehole problems such as increased torque and drag or shale instability. The problems encountered were to a depth of 14,799 feet. Original mud weight (invert emulsions) was 16.8 lbs./gal. lignosulfonate system the problems were overcome and the mud weight was later raised to 17.0 lbs./gal.

By use of the specialty materials in this system, the 4 1/8" wellbore was healed and drilled to a T.D. of 15,232 ft., where a 3 ½" liner was set. The operator was pleased by the ability of this program to overcome serious problems and allow this well to be completed in spite of adverse conditions.

See page loss control additive. For use in oil and water muds.

General Description

Preferentially oil wettable, surface modified micronized cellulose fibers.

Product Benefits

Provides excellent seepage control without the expected large increases in rheology common to other cellulose fibers.
Good high temperature performance.
Effective secondary emulsifier in invert emulsions.
Biodegradable.

Product Description

Color: Light tan
Form: Finely divided, cellulose fibers
Specific Gravity: 0.9
Bulk Density (lbs./cu. ft.):
Uncompacted: 10-12
Compacted: 22-25
pH in Water (10 ppb): 6.5-7.5
Packaging: 25 lb. multi-ply bag with poly-inner liner.

Typical Treatment:

Blen-Fyber is used as a treatment for seepage losses in all mud systems. It may be used in pretreating the entire circulating system by adding 4-10 lbs/bbl. Maintenance will vary according to the formation and the amount of overbalanced pressure. Normal maintenance levels of treatment are only 3-6 sacks per tour.
Blen-Fyber can also be used through periodic sweeps, pills or slugs. In most cases, concentrations of 15-35 lbs./bbl. are recommended. This remedial approach can be used to obtain maximum sealing performance with the minimum of product cost and time.

Recommended Uses:

Unique seepage loss additive for oil and water mud systems.
May be used in high concentrations in oils or water as a high fluid loss/high solids squeeze to cure severe lost circulation.
Ideal for use in muds when drilling through depleted or normally under-pressured sands.
Excellent hole cleaner prior to running casing or logs.
Good mechanical hole cleaner to use while milling or cutting casing windows.