Orienting Taxis

Orienting Taxis TTA-505 & TTB-505

Slip-over orienting taxis with 0.5” standoff in an 8.5” wellbore — tungsten carbide (TTA) or sealed ball bearing (TTB).

TTA-505TTB-505

Description

The 505 series orienting taxis provide 0.5” standoff in an 8.5” wellbore. Two bearing options are available: the TTA-505 with tungsten carbide bush bearings and the TTB-505 with sealed ball bearings.

TTA-505 — Type A, Tungsten Carbide Bearing

Slip-over tool taxis with tungsten carbide bush bearings, designed to orient & reduce the drag coefficient of a logging tool string.

Taxis lock securely onto the tool housings or into c-spanner recess holes and fit both 3 5/8” and 3 3/8” logging tool housings.

Gravity logging up to 70 degrees well deviation using a slip-over wheel design
Orient logging tool sensors, cores, pressure measurements and samples without the need for standoffs, bow springs, tool turners etc.
Stick-slip and cable tension reduction
Eliminate risk of tool differential sticking by offsetting tools from the wellbore wall
Robust design. Very low maintenance requirement.

TTB-505 — Type B, Ball Bearing

Slip-over tool taxis designed to orient & reduce the drag coefficient of a logging tool string.

Taxi wheels run on ball bearings in a sealed, pressure compensated, lubricant bath providing the lowest friction in class.

Taxis lock securely onto the housings or into c-spanner recess holes and fit a range of logging tool housing OD.

Gravity logging up to 80 degrees well deviation using a slip-over wheel design
Orient logging tool sensors, cores, and pressure measurements and samples without the need for standoffs, bow springs, tool turners etc.
Stick-slip and cable tension reduction
Eliminate risk of tool differential sticking by offsetting tools from the borehole
Robust design. Very low maintenance requirement.

Specifications

Technical Specifications
Model	TTA-505	TTB-505
Weight	26 lbs
Length	11.4”
Volume	0.05ft3
Min. Hole Size	8”
Max. Hole size	17.5”
Drag Coefficient, dynamic	5%	2%
Drag Coefficient, Static	12%	4%
Temperature rating	350°F
Pressure rating	30,000 psi
Taxi OD	7-¼”
Wheel diameter	6”
Taxi Bore¹	3-⅝”
Standoff in 8.5” Wellbore²	0.5”

¹Fits a 3-5/8” logging tool and a 3-3/8” tool housing via a reducing sleeve. Other version , TTA-705 is available with a 3.7” bore.
²Set Standoff parameters to appropriate offset, see next page.

Materials
Body	17-4 PH SS
Bearings¹	Tungsten Carbide composite	Custom ball bearing
Lubrication	Passive	Active Diaphragm: Nitrile < 230°F Viton < 480°F
Grease	Lubriplate 930AA
Fastening	304 Stainless Steel Cap Screws 1/4”, 3/16” hex UNC thread
Attachment	Alloy Steel grub Screw , 1/4” hex, UNC Thread, Dog end type
SWL for fishing	50,000 lbs
SWL Shear Set Screws	8,500 lbs

¹Tungsten carbide must not be subjected to shock loadings, Do not hit with a hammer or use gas torch.

Standoff Table
Bit Size	Tool Housing OD:
	3-3/8”	3-5/8”
8 1/2”	0.6”	0.5”
9 7/8”	0.5”	0.4”
12 1/4”	0.4”	0.3”
17 1/2”	0.3”	0.2”

Charts & Diagrams

Orientation moment diagram for the 505 taxi — Orientation principle

Standoff of a 505 taxi on a 3-5/8” tool — Standoff on a 3-5⁄8” tool

Other models in this family

All Tool Taxis →

Model	Role	Bearing	Hole size	Bore	Temp	Weight
TTA-515, TTB-515 Conveyance Taxis TTA-515 & TTB-515	Convey	Type A (carbide) / Type B (ball)	8″ – 24″	3-5/8″	350°F	26 lbs
TTB-715 Conveyance Taxi TTB-715	Convey	Type B (ball)	8-1/2″ – 24″	3-7/8″	350°F	28 lbs
TTB-X-515 Centering Taxi TTB-X-515	Centre	Type B (ball)	8-1/2″ – 24″	3-5/8″	350°F	28 lbs
TTB-S75, TTB-S75U, TTB-S85 Formation Tester Taxis TTB-S75 & TTB-S85	Formation testing	Type B (ball)	8-1/4″ – 22″	5″	350°F	22 lbs
TTC-IL6O, TTB-IL6O In-line Orienting Tool Taxi TTB/TTC-IL6O	In-line orient	Type B (ball)	5-7/8″ – 8-1/2″	—	350°F	32.8 lbs
TTB-IL6C In-line Conveyance Tool Taxi TTB-IL6C	In-line convey	Type B (ball)	5-7/8″ – 8-1/2″	—	350°F	32.8 lbs

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