Downhole Tractor - m.il.wellsuntechnology.com

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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