Diagnosing Problems With Injector Chain Tension

Objectives

List problems that can occur with the chain tension circuit
List causes for chain tension problems
Describe basic tests for the chain tension circuit

The Problem

Failure to maintain tension on the injector head chains can cause:

Unusual noises at the injector head
Uneven motion and jerking when pulling out of hole (POOH)
Damage to the tubing
Damage to the injector head and chains
Difficulties with the use of the tubing traction system

Failure to maintain tension on the injector head chains can cause the chain to skip while running in hole (RIH) as well.

Causes of Chain Tension Faults

Inconsistent or incorrect tensioning of the injector chains may be caused by basic mechanical faults such as:

Stretched or broken chains
Badly worn sprockets (diameter now too small)

In both of these causes, the chains will remain slack, but the chain tension hydraulic circuit will still be working as normal, and will provide normal pressures once the tension cylinders are fully extended.

Chain tensioning problems such as low, or erratic tension pressure, may also be caused by a hydraulic system fault such as:

Failure to set pressures correctly
Failed chain tension, pressure setting valve
Leaking through the bleed valve
Quick connector not fully connected
Particle contamination in the hydraulic fluid
Air contamination in the hydraulic fluid
Tension cylinder leakage
Leaking hose or fitting

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We hope you enjoyed Diagnosing Problems With Injector Chain Tension

Vacuum Pressure

Drain Pressure

Low Pressure

Medium Pressure

High Pressure

Ground/Common

Lowest Voltage

Medium Voltage

Highest Voltage

Magnetic Field