Job Hazard and Risk Assessment

Job Hazard and Risk Assessment ITEM

NO. HAZARD HAZARD EFFECT

EFFEC

T PROB RISK MINIMIZE RISK BY

RESIDUAL

RISK

1

Caliper tool string

becomes stuck

while running

Caliper inside well

bore

Unable to pull tool

string. Follow

procedures to pull

out of weak point

Low Low Low

Detailed engineering

drawings are made

available of all possible

'risk' areas. Minimize

flat shoulders on tools

and centralizers

Low

2

Wireline cable is

damage or broken

while in hole.

Master or crown

valve closed while

in hole

Wireline cable parts

causing possible

personnel injury.

Caliper and wireline

lost downhole

High Low Low

All crane operations will

be suspended over or

near wireline unit while

in operation. Sheave

wheel guards will be

securely fastened.

Constant monitoring of

wireline cable during

operation.

Proper wireline cable

maintenance

Low

3 Wireline sheave

fails

Possible injury to

personnel. Loss of

tools and /or

damage to wireline

cable

High Low Low

Visual check of

sheaves is

implemented prior too

and during operation.

Correct mounting and

usage of sheave is

carried out

Low

ITEM

NO. HAZARD HAZARD EFFECT

EFFEC

T PROB RISK MINIMIZE RISK BY

RESIDUAL

RISK

4

Damage caliper tool

string while rigging

up or rigging down

Injury to personnel

and equipment Low Low Low

Good communication

established with all key

personnel prior too and

during wireline

operation.

Low

5 Hydraulic failure

(Power pack )

Unable to retrieve

tools from well bore Low Low Low

Power pack

maintenance perform

before all operations.

Visual inspection

perform during

operations

Low

6 Failure of tools

while in hole

Delayed or unable

to carry out

operation

Low Low Low

All tools and equipment

to perform caliper

operation to be check

prior to load out to well

site.

Low

Job Hazard and Risk Assessment

Job Hazard and Risk Assessment

ITEM

NO. HAZARD HAZARD EFFECT

EFFEC

T PROB RISK MINIMIZE RISK BY

RESIDUAL

RISK

7 Pull out of weak

point

Loss of caliper tool

string in hole create

fishing operation.

Broken cable

causes injury

Med Low Low

Ensure weight indicator

is functioning

effectively. All potential

hang up areas are

minimized and well

documented. Cable

head built to proper pull

out or weak point

Low

8

Caliper damage,

failure or loss due to

debris left in hole

after milling

operations

Caliper tool string

lost or operation

delay due to

hazard's downhole

Med Low Low

Survey to be carried

out with potential

hazards in mind.

Logging speed >TBD

ft/min.

Low

9

Electronic depth

measurement

system

Caliper tool string

lost or damage due

to in-accurate depth

correlation.

Low Low Low

Check depth system

prior to running in hole.

Ensure mechanical

back-up working

properly. Correlate with

known tubulars, casing

collars or BHA

Low

ITEM

NO. HAZARD HAZARD EFFECT

EFFEC

T PROB RISK MINIMIZE RISK BY

RESIDUAL

RISK

10 Manual handling

and lifting

Possible personnel

injuries incurred

and/or damage to

equipment.

Med Low Low

Correct lifting

techniques to be used,

crane to be used for

heavy and awkward

lifts.

Low

11 Damage rubber

packer

Steam comes out

from Lubricator and

possible with H2S

gas

Low Low Low

Check rubber packer

before usage. Service

BOP for every run. If

rubber packer swell

during operation and

more steam comes out,

use pack-off pump to

squeeze the rubber and

diminish rubber packer

wireline hole.

Low

Job Hazard and Risk Assessment