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感 悟 科 技 引 领潮 流
Downhole Tractor
Jun.,2015
Agenda
Introduction;
Composition;
Surface Control System;
Control Software;
Simulation Software;
Downhole Tools;
Specifications;
Tools Quality;
Field Test;
Application
To convey the logging tools/perforating tools/completion
tools in highly deviated/horizontal wells.
Introduction
Compared with CT or Drillpipe
Less operating time;
Simplified logistics;
Improved work efficiency
and reduced cost;
Well-sun tractor features
Motorized.
Smart control to reduce
operational risks.
Improved production log quality.
Composition
Hardware
1 Surface Control System;
1 PC (optional);
2 Downhole sections;
Spares and accessories;
Composition
Software
Simulation software: TracSim
Control software: Tractor Work Control
Surface Control System
Power downhole tractor
Control downhole tractor
Control Software
Control downhole tractor through the surface control panel:
– Open/Close arms
– Run/Stop
Monitor the operating parameters:
– Supply voltage
– Cable head voltage
– Supply current
– CCL
– Depth
– Cable Tension
– Cable head tension
– Tractor speed
– Cable speed
Tractor Work Control
Simulation software TracSIM is used to:
Forecast cable head tension and surface tension
Forecast free fall depth in deviated well
Determine if tractor is needed and how big the pull force is required.
Simulation Software
Simulation Software
With the simulation software, the user can prepare different
operational programs and emergency plans to avoid risks and
improve the rate of success.
User Inputs:
Well depth
Deviation
Orientation
Cable parameters
Safety pull force limit
Fluid density
Flow rate
String weight
String length and OD
Cable frictional factor
Tension range at cable
head weak point
Outputs:
Well trajectory
Max. thru-length.
surface pull force limit to break the weak point, weak point rated
value and limit value.
Surface cable tension and cable head tension curves against depth
Tension limit at different depth points.
Driving force required to reach the target depth versus tractor rated
driving force.
Max. free fall depth
Max. speed of lowering
Downhole Tools
Tractor Electronics
Tractor
Passenger Tools
Auxiliary Tools
Tractor Tools
Other Tools
Cable Head
Swivel Sub
Knuckle Joint
Centralizer
CCL
Gamma
Head tension
unit
PLT SBT
Downhole Tools
Specifications
OD Max. Temp.
Max. Press.
Max. Volt.
Max. Curr.
Max. Speed
Max. Load
Casing Size Comm. Remark
54mm 150℃ 100MPa 600V 1.5A 5m/min. 300kg 4 1/2” – 9 5/8” FSK Mono-
conductor
73mm 150℃ 100MPa 820V 1.5A 5m/min. 450kg 5”-9 5/8” FSK Mono-conductor
89mm 150℃ 100MPa 820V 1.5A 5m/min. 450kg 7”-9 5/8” FSK Multi-conductor
Superior stainless steel for creeping arm etc. components.
Stainless steel or titanium alloy for housing and body frame.
Alloy gear steel for creeping wheel and driving gear.
Tools Quality
Material Selection
Fluororubber O-ring
― Parker company in USA.
― Rated temperature 200℃.
― Good performance in hot oil, aromatic solvents, different
chemicals and fire resistant hydraulic oil which contains
strong acid and hydrocarbon chlorides.
High temperature DC brushless motor
- custom made in Germany;
- Output power: 1.2KW;
- Rated temperature: 200℃
- Rated pressure:100MPa.
Tools Quality
Material Selection
Resistors, capacitors and transistors
imported from Well-known manufactures,
rated temperature: 175℃.
IC components imported from well-
known US manufactures, which conform
to US military standards.
Tools Quality
Material Selection
Stringent high temperature tests at 175℃.
Tools Quality
Date: July 13th – 18th, 2013
Location: An offshore platform in South China Sea
Project: SBT logging for cement evaluation
Field Test
Field Test
Simulation Factors:
The tool frictional factor: 0.22
The cable frictional factor: 0.27.
Cable head weak point max pull force:
8000lbs.
Cable weight: 350lbs/kft.
Well Condition:
The well is a shut-in well.
Downhole fluid is water, filled up
to the wellhead.
Simulation
Conclusions:
Max. free fall length: 1530m.
At 1400m, cable head tension reaches Max. value and the surface tension is about
2250lbs. The break point is about 15488lbs (8000lbs on weak point).
Field Test
Simulation
Field Test
Well Graphs View
Field Test
Completion View
Field Test
Job View
Total Length: 25,960.4 mm
Field Test
Tractor Length : 11,998.4mm
Logging Tools Length: 13,962.0mm
Field Test
感 悟 科 技 引 领潮 流
The Middle East JV Company
Thank you!
Jun.,2015
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