NON-MAGNETIC DRILL COLLARS

EMPIRICAL DATA CHARTS TO DETERMINE REQUIRED LENGTH OF NON-MAGNETIC DRILL SYSTEM

AREA 1

MAX.

HOLE

DRIFT

ANGLEFROM

VERTICAL

0°

20°

40°

60°

80°

80°60°40°20°0°

DIRECTION ANGLE FROM MAGNETIC

NORTH OR MAGNETIC SOUTH

(UNCORRECTED)

CURVE 3

CURVE 2

CURVE 1

BELOW CURVE 1, USE 1-30 FT. NON-MAG COLLAR

BETWEEN CURVE 1 & 2, USE 2-30 FT.NON-MAG COLLARS

BETWEEN CURVE 2 & 3, USE 2-30 FT.

& 1-19 FT. NON-MAG COLLARS

IN THIS AREA USE3-30 FT. NON-

MAG COLLARS

AREA 2

MAX.

HOLE

DRIFT

ANGLEFROM

VERTICAL

0°

20°

40°

60°

80°

80°60°40°20°0°

DIRECTION ANGLE FROM MAGNETIC

NORTH OR MAGNETIC SOUTH

(UNCORRECTED)

CURVE 3

CURVE 2

CURVE 1

BELOW CURVE 1, USE 1-30 FT. NON-MAG COLLAR

BETWEEN CURVE 2 & 3, USE 2-30 FT.

& 1-19 FT. NON-MAG COLLARS

IN THIS AREA USE3-30 FT. NON-

MAG COLLARS

BETWEEN CURVE 1 & 2, USE 2-30 FT.

NON-MAG COLLARS

AREA 3

MAX.

HOLE

DRIFT

ANGLEFROM

VERTICAL

0°

20°

40°

60°

80°

80°60°40°20°0°

DIRECTION ANGLE FROM MAGNETIC

NORTH OR MAGNETIC SOUTH

(UNCORRECTED)

CURVE 3

CURVE 2

CURVE 1

BELOW CURVE 1, USE 2-30 FT. NON-MAG COLLARS

BETWEEN CURVE 2 & 3, USE 4-30 FT.

NON-MAG COLLARS

IN THIS AREA USE5-30 FT. NON-

MAG COLLARS

BETWEEN CURVE 1 & 2, USE 3-30 FT.NON-MAG COLLARS

AREA 3

AREA 2

AREA 1

AREA 2AREA 3

AREA 3

60°

40°

20°

0°

40°

20°

80°

140°160° 120° 100° 80° 60° 40° 20° 0° 20° 40° 60° 80° 100° 120° 140° 160°

AREA 3

AREA 2

AREA 1

AREA 2AREA 3

AREA 3

60°

40°

20°

0°

40°

20°

80°

140°160° 120° 100° 80° 60° 40° 20° 0° 20° 40° 60° 80° 100° 120° 140° 160°

KEEP THE HOLE ON COURSE W/ OUT MAGNETICSURVEY CONFUSION

For accurate directional drilling and bottom hole surveying,Spidle Turbeco’s non-magnetic drill collars allow for atrue reading of the earth’s magnetic field. Without interfering withaccuracy of magnetic surveys, these stainless steel collarsprovide strength and hardness equal or better than standard steelcollars. They are compatible with other standard drill stringcomponents. Nonmagnetic integral blade stabilizers, weldedblade stabilizers and subs are available upon request.

WELL LOCATION DETERMINES STRING LENGTH

In areas closer to the earth’s magnetic poles, long sections of ournon-magnetic collars and stabilizers are used. Determine the totallength of the collars required by referring to the global map and thecorresponding empirical data chart.

SQUARE & TRI-SIDED DRILL COLLARSSpidle Turbeco’s Square and Tri-sided Drill Collars are run in packed hole assemblies toreduce rapid changes in crooked hole formations. While both afford the needed rigidity toaccommodate weight on bit requirements to achieve desired rates of penetration, the Tri-SidedCollar design allows for enhanced fluid circulation and less potential for differential sticking.Square drill collars are available in hole sizes 6 inches thru 17 ½ inches. Tri-Sided drill collarsare available in hole sizes 6 inches thru 12 1/4 inches.

Both are available in 15 foot and 30 foot lengths

SPIRAL AND SLICK DRILL COLLARSSpidle Turbeco’s Spiral Drill Collars will minimize the potential for differentialsticking. The Spiral Drill Collars will reduce the amount of contact between the drill collarand the wall of the hole. Slick Drill Collars also available.

Spiral Drill Collar Slick Drill Collar