Correct Hazid Checklister

Structured Checklist Approach should be used to identify hazards during the entire life of the facility. To achieve this aim, the facility Life has been divided to Pre-operational phase, Operational phase, Post Operational Phase

The preoperational phase consists of

Drilling of new wells and well completion Construction and Tie in of Flow lines and Pipelines Hook up and commissioning of well heads and Flow lines

Operational phase consist of

Normal well production operations Well maintenance activities Simultaneous operations

Post Operational Phase Involves

Pipeline decommissioning Well Kill operations/ well decommissioning

The following will be considered

The impact of the natural environment on plant operations The Impact of the Plant/activity on the Human environment Effects of manmade hazards on the plant Effects of infrastructure supporting the facility where applicable Process Hazards where applicable Utility system Hazards Health hazards Other hazards within the facility

No Node Unit Location Hazard Category Guide Word Causes Potential Consequences Safe Guards Recommendations Priority

1 Well heads Subject Infill wells Impact of natural environment

Lightening during drilling

Thunder storms Possible Damage to electronic drilling equipment

Possible well kick Possible Blowout Explosion/Fires Injuries/ fatalities

Ensure drilling contractor demonstrates adequate preparation for this hazard by checking that the following items are met at minimum

By use of full-size ground conductor to earth rig equipment

The use of bare copper conductor or braided wire, sized not less than 2/0 AWG, connected between all electric motors to the building or skid. All buildings or skids should be interconnected with the same size conductor

An earth rod will be driven as close as possible to low wet areas to achieve desired grounding. Rods should be at least eight feet (2.4 meters) long and 3/4” (1.9 cm) in diameter. Outer surface of rods should be either galvanized or copper coated.

If rock is encountered, the rod should be driven at an angle not to exceed 45 degrees from vertical or should be buried in a trench that is at least 30 inches (76.2 cm) deep. Fill trench with a 3/32” (2mm) layer of salt. Backfill with native earth. Earth substructure to conductor in order to

1


achieve desired grounding.

Bond all skids and auxiliary equipment together to form a “loop” type system, wherever possible, so that the continuity of the grounding circuit will be maintained even if one conductor is severed.

Grounding connections on skids should be rust-proof (stainless steel bolts are recommended).


Continuous/ Frequent Plant discharges to air from nearby facilities during drilling

Discharge from Flow station Cold vents

Toxic Combustion Products from adjacent flow station Flare

Flammable gas around drilling Vicinity

Flash Fire/ JET Fire Explosion

Company consideration has been given to emissions from existing nearby facilities

Hazardous area classification should be in place for the well sites during drilling operations

Electrical equipment should be rated for use within defined hazardous zones

TPENG should put in place (PTW) systems for operations likely to increase the probability of ignition, if not in existence


Emergency/ Upset Plant discharges to air from nearby facilities during drilling

Discharge from Flow station Cold vents

Toxic Combustion Products from adjacent flow station Flare

Flammable gas around drilling Vicinity

Flash Fire/ JET Fire Explosion

Verify if Company consideration has been given to emergency emissions from existing nearby facilities

Hazardous area classification should be in place for the well sites during drilling operations

Electrical equipment should be rated for use within defined hazardous zones

TPENG should put in place (PTW) systems for operations likely to increase the


probability of ignition, if not in existence

4 Well heads Subject Infill wells Impact of drilling on natural environment

Noise emanating from well site during drilling operations

Heavy Duty and Vibrating equipment

Hearing impairment to drillers due to excessive noise levels

Brain stress leading to concentration loss

Occupational hazards

Speech Interference Community

annoyance (subject to confirmation of community closeness)

Facility has been located far from inhabited areas

Establish baseline noise tolerability criteria if not in place

Carry out a noise assessment study for the drilling operation

Ensure drilling contractor presents a valid noise control plan for the facility

Ensure appropriate PPE are worn during noise drilling operations

5 Well heads Subject Infill wells Impact of Drilling on the Natural Environment

Vibrations from drilling operations

Drilling equipment Vibrations

Torsional Vibrations

Well conditions Poor Adherence to

drilling plans

Drilling equipment failure

Geophysical studies have been done to ensure that a durable drilling plan would be prepared

Ensure Drilling contractor prepares a well drilling plan

Select appropriate contractor for drilling task

Consider putting systems in place to ensure compliance with drilling plan

6 Well heads Subject Infill wells Impact of Drilling on the Natural Environment

Environmental pollution during drilling operations

Hydrocarbon Effluent discharge to environment

Solid and hazardous waste discharge to environment

Pool fire Environmental

concerns Potential liability

concerns Company Image

concerns

The drilling location and the associated roads should be planned so that they are constructed such that storm water runoff is diverted away from the location and that the location's storm water runoff

Appropriate waste minimization techniques should be incorporated into drilling mud system design in drilling plan

Reserve Pit design should ensure pit is V-shaped so that muds wont channel away from the suction

Equipment modifications

Process or procedural


modifications Inventory control Good housekeeping

and preventive maintenance

Contractor selection Drilling Contractor

should consider the options of recycling

6 Well heads Subject Infill wells Impact of manmade hazards on the facility during drilling operation

Security Breach on drill site during drilling operations

Internal sabotage Inadequate

security plan Inefficient

resources to implement security plans (poor lightening, communication gadgets, e.t.c)

Injuries/ fatality Drilling equipment

theft Vanadalization of

existing equipment

Injuries/ fatality Drilling equipment

theft Vanadalization of

existing equipment

Update security plan to continually cater for present security realities during the entire facility life

Employee security background check should be in place for staff and drilling contractors of not in place

Emergency Response plan should be in place (check if applicable)

Ensure lightening is in place at all times during drilling operations

Adequate escape and evacuation plans should be in place

7 Well heads Subject Infill wells Effects of infrastructure supporting the facility

Support supply failure to facility during drilling operations (shortage of drill muds, shortage of vital drilling chemicals,

Poor road condition

Contractor oversight

Project Monitoring oversight

Accident Project delay

resulting in financial loss

Injury Fatality Chemical Exposure

(occurs if there is a loss of containment)

None as at the moment (subject to TPENG verification)

Good selection process for drilling contractor

A Detailed drilling plan , completion and testing plan should be in place

Prepare Journey management plan and subject it to several layers of verification

Prioritize local procurement of materials

8 Well heads Subject Infill wells Release of Flammable /toxic Inventory during drilling

Emissions from power generation equipment/ combustion engines

Asphyxiation (carbon monoxide poisoning)

Explosion

Hazardous area classification of the drilling site has been carried out

If combustion engines are in place, ensure flue gas orientation is oriented towards a safe area.


Well testing operations

Mud degassing In efficient rig

commissioning and decommissioning opeartion

A plume dispersion studies should be conducted to verify this

Ignition sources should be verified by ensuring only equipment rated for the given haxardous zones are permitted into the drilling site

Good drilling plan Good completion plan Good testing plan

9 Well heads Subject Infill wells Blow out Failure of blow out preventers

Well bore ruptures Gas Migration

from reservoir

Injury Fatalities Explosion/ Fire

Good drilling plans should be put in place by drilling contractor

Drilling operations should be monitored to ensure that drilling plans are followed

10 Well heads Subject Infill wells Lifting operation hazards during drilling

Dropped objects and swing loads

Damage to Drilling equipment

Fatality or Risk Mud discharge Pollution

Ensure lifting equipment is certified fit for use

Ensure Crane operator is certified

Ensure measures are taken to keep workers and vulnerable equipment off lifting radius

Drilling Plan Develop emergency

response plan

11 Well heads Subject facilities Onsite traffic hazards during Drilling operations

Vehicular damage to existing flow lines and manifold

Increase risk of accidents within the facility due to the increased movement frequencies

Driver fatigue Non adherence to

speed limits

Loss of containment Fire Explosion Damage to existing

well heads Financial loss Injury Fatality

Access roads to the drilling site have been marked

There is a fence barrier within the well enclosure

Fire and Gas detection system is installed on existing well heads

Shutdown procedures in place to control hazards

Ensure speed limits are enforced

Consider a vehicle tracking system to help enforce speed limits

Consider discouraging private transportation for drilling site workers. Provide public transportation systems for every drilling worker to minimize the frequency of

Akintoye Asaolu, 03/31/12,

Verify This before submission


Vehicular activity Ignition suppression

measures should also be in place.


Wellheads Entire facility Construction/ hook up activity disruption due to bad weather conditions (Rain)

Wet season Slips, Trips and falls LTI Project delay Revenue loss

Look into the possibility of ensuring tie in and modification activities are carried out during dry season

12 Well heads Entire facility Lightening during Tie in and modification works to well head

Thunderstorms Electrical shock Injury Fatality

Flow lines, Piping and pipe supports should be earthed according to the prevailing standards

13 Entire facility Release of flammable inventory during hook up and commissioning

Dropped object on existing flow line during hook up

Rupture/ leak of existing flow station due to vehicular impact during loading and unloading operations

Lack of communication,

Poor lifting operations

Overpressure during pressure testing of pipelines

Leak during pressure testing of pipelines

Leak Fire Explosion Loss of revenue Flow line rupture

Fire and gas detectors have been installed on existing flow line configuration

Existing flow wells have flow and pressure monitoring in place. This helps isolate the ruptured or leaking section and minimizes inventory loss

Verify that existing flow line(s) from producing well(s) have/has been designed for relevant sizing cases.

Selection of hook up of contractor

As part of permit to work system, consider ensuring that the Pre Job JSA’s and hazard identification techniques are carried out before commencement of operations

To suppress the chances of ignition, welding operation should only be done after PTW systems must have taken effect

14 Entire Facility Loss of vital utility systems (power, air, fuel gas/oil)

Power failure Loss of supply of

fuel gas oil Loss of

containment of fuel gas oil

Disruption in hook up and tie in operations

Equipment or machinery failure

Project delays Loss of revenue

Consider ensuring hook up contractor carries out a pre-construction risk assessment and make a good construction plan . This ensures that utility requirement are


Consider copying recommendations in previous lightening scenario down or consult electrical for specific steps to be taken to earthen the installation during hook up


outlined and provided for before commencement of tie In and hook up operations.

Security Breach on construction site during hook up and Tie in operations

• Internal sabotage

• Inadequate security plan

• Inefficient resources to implement security plans (poor lightening, communication gadgets, e.t.c)

• Injuries/ fatality

• construction equipment theft

• Vanadalization of existing equipment

• • Update security plan to continually cater for present security realities during the entire facility life

• Employee security background check should be in place for staff and drilling contractors of not in place

• Emergency Response plan should be in place (check if applicable)

• Ensure lightening is in place at all times during construction operations

• Adequate escape and evacuation plans should be in place

Socio Political Unrest during hook up and tie in of flow lines

Riots Civil disturbances Political Unrest

Delay in construction operation due to industrial strike action

Project delay Revenue loss Increased security

around facility Subject take over by

new regime

It is assumed that adequate consideration has been given to the political situation around the country and it has been deemed fit to conduct the product for its entire life. However in the event of such occurrences , a viable exit strategy is in place

Ensure security plan on site during the entire life of the facility caters for incidents like this

Release of hazardous solid/gaseous materials to the environment during line flushing and purging respectively to the environment

Inadequate waste management plan

Leak around the flow line /piping segment

Environmental pollution

Asphyxiation if Nitrogen is used for purging

Injury Fatality

Ensure company guidelines for pipeline and flow line pre-commissioning tests are adhered due during these operations

Construction contractor / responsible party should prepare a pipeline/Flow line purging and pressure testing philosophy


Continuous emissions from nearby producing well head facilities

Well head blow out

Well head leak Flow line rupture/

damage due to dropped objects

Flow line damage due to drilling activity

Gas leak Ignition Fire Explosion Liquid pool

Design provisions for Fire and Gas detection systems on the subject site are in place

Minimize sources of ignition and ensure that only approved hot work is done in the vicinity of the existing flow lines

Ensure electrical equipment within the construction site are rated for the hazardous zones

Verify that existing flow line and pipelines on the subject are clearly marked

Consider ensuring contractor develops a construction risk management plan.

Noise resulting from flow lines and Tie-in operations

Heavy noise generating equipment

• Hearing impairment to drillers due to excessive noise levels

• Brain stress leading to concentration loss

• Speech Interference

• Community annoyance (subject to confirmation of community closeness)

• Facility has been located far from inhabited areas

• Establish baseline noise tolerability criteria if not in place

• Carry out a noise assessment study for the construction operation

• Ensure drilling contractor presents a valid noise control plan for the facility

• Ensure appropriate PPE are worn during noisy construction operation

Increased Vibration around facility due to construction operation

Heavy equipment vibration

Vibration stress induced in existing flow lines and well head facilities

Pipeline/Flow line failure

Loss of containment Explosion Fire

Construction contractor should estimate the expected magnitude of vibration , its impact on existing facilities on subject and appropriate risk management decision should be noted.

This is part of the wider document called construction risk management plant

slips, trips and falls during Construction

Poor construction site layout

Cluttered construction site

Injury LTI Fatality

Company and construction contractor should agree on a proposed construction site layout as specified in


the construction risk assessments and construction Risk management plan that has been recommended earlier

Company should ensure compliance with appropriate construction site safety regulations with respect to contractor

Lightening during normal facility operation

Thunder storms Inadequate

earthening systems

Damage to well head control panels

Damage to electrical functions (lightening and other electrical dependent facilities) around the facility

All forms of electrical equipment have been designed to be appropriately earthed

Continuous /frequent discharges to air from nearby flow station during normal facility operations

Gas dispersion from adjacent flow station cold vents and flares

Toxic Combustion products from adjacent flow station flare

Explosion Injury/Fatality Asphyxiation

Sensitive fire and gas detection system has been provided for all zones of the facility in the design

Hazardous area classification has been done and a schedule of electrical equipment to be used within the zone has been generated

Plans are currently on the way to stop/minimize flaring at adjacent flow station facilities in the long run

Consideration has been given to the dispersion of flammable gas from the flow station to subject infill wellheads and associated



flow lines within the subject facility , it is seen that emmisions from OFS does not in anyway constitute a risk to the subject facilities

Emergency/upset discharges from nearby flowstation during normal facility operations

Gas dispersion from adjacent flow station cold vents and flares during emergency operations

Toxic Combustion products from adjacent flow station flare during emergency operations

Explosion Injury/Fatality Asphyxiation

Sensitive fire and gas detection system has been provided for all zones of the facility

Hazardous area classification has been done and a schedule of electrical equipment to be used within the zone has been generated

Plans are currently on the way to stop/minimize flaring at adjacent flow station facilities


Verification to be made as to whether flare studies where made for emergency flaring conditions

Noise emanating from well site during normal operations

Erosion of flow lines

Hearing impairment to drillers due to excessive noise levels

Brain stress leading to concentration loss

Occupational hazards

Speech Interference Community

annoyance (subject to confirmation of community closeness)

Facility has been located far from inhabited areas

Erosion has been reduced to the bearets minimum during line sizing

Establish baseline noise tolerability criteria if not in place

Carry out a noise assessment study for the normal operation

Ensure there is a valid noise control plan for the facility

Piping team should ensure that there are few sudden break and turns in pipe routing.

Vibrations from normal operations

Vibrations resulting from fluid flow

Pipe/flow line failure Loss of containment Fire Explosion spill

The effects of vibration were duly factored in the piping design

Appropriate Fire

Ensure that only electrical equipment certified for use in hazardous zones are in place


Re-organize statement


and gas detection systems are in place to ensure successful detection and mitigation should a piping failure occour

Hazardous area classification has also been done to classify hazardous zones appropriately

6 Well heads/ flowlines and manifolds

Subject Infill wells Impact of normal plant operations on the well heads on the Natural Environment

Environmental pollution during normal operations

Loss of containment

Leak of piplines/ flowlines and well heads

Pipline rupture on flowlines and pipelines

Valve failure on well head

Pool fire Flash/ jet fire explosion spill Potential liability

concerns Company Image

concerns

Active fire and gas detection systems have been provided in the design of the facility

Active fire fighting systems have been provided to in the facility design

Appropriate shutdown levels are in place to minimize inventory loss as soon as it is detected

Flow monitoring and pressure sensing devices have also been factored into the design to rapidly detect leaks.

Ensure routine inspection and maintenance of well heads, flow lines and pipelines

Ensure the reliability of the fire and gas system meets the required specifications

Ensure reliable vendors for fire and gas detection systems are patronized. This is to ensure that fire and gas detection system don’t give spurious alarms or do not reamin ineffective.

6 Well heads Subject Infill wells Impact of manmade hazards on the facility during drilling operation

Security Breach on Subject facility during normal operations

Internal sabotage Inadequate

security plan Inefficient

resources to implement security plans (poor lightening, communication gadgets, e.t.c)

Injuries/ fatality Vanadalization of

existing equipment Theft of mobile

equipments Revenue loss

Perimeter fencing is in place to countger security threats

There is an existing provision for routine patrol on the installation

Update security plan to continually cater for present security realities during the entire facility life

Employee security background check should be in place for staff and maintenance personnel if not in place

Emergency


Response plan should be in place (check if applicable)

Ensure lightening is in place at all times during drilling operations


7 Well heads Subject Infill wells Effects of infrastructure supporting the facility

logistics failure during mobilization of critical supplies (lubricant fluids, hydraulic fuids) to site during normal operations

Poor road condition

Port Clearing issues for items to be imported

Inadequate transportation media

Wrong Journey management plan

Accident Fraud Project delay

resulting in financial loss

Injury Fatality Chemical Exposure

(occurs if there is a loss of containment while transporting them to well area for use)

Good Project Management

Good selection process for supply contractor

Consider smoothening access roads to facility

Consider selecting contract minimal transportation requirements

Prepare Journey management plan and subject it to several layers of verification

Prioritize local procurement of materials

8 Well heads Subject Infill wells Release of Flammable /toxic Inventory during normal operations

Erosion Corrosion Weld failure Pipeline/ flowline

rupture Well blow outs

Loss of containment Explosion Pool/ jet fire Leak Spill Revenue loss Company

environmental compliance concerns

Adequate line sizing to ensure that pipelines/ flow lines are not subject to overpressure

Provision of sand analyzer to detect presence of sand particles

Line sizing has factored in a corrosion allowance

Provision for corrosion inhibition systems have been factored into the design

Provision of methanol injection into wells during gas producing to

Piping team should ensure Adequate pipeline routing and flow sizing to prevent erosion

Ensure quality assurance of all facility items installed is carried out before use

Routine inspection and maintenance

Ensure specified corrosion inhibition and methanol injection dosage rates are strictly adhered to. Should well conditions or any other process condition change, appropriate dosage rates should be specified


phase to prevent hydrate formation along the pipeline. This could help prevent pipeline clogging and hence overpressures upstream the flow line/ pipeline

Hazardous area classification has been doen to highlight hazardous zones within the subject scope

Ensuring a corrosion monitoring system on subject well head facility is in place

Ensure instrumentation meets the minimum required SIL ratings and any other relevant standard

Minimize ignition sources by putting PTW systems in place (if not in existence) to carry out ignition sensitive tasks

Ensure that only electrical equipment certified for use within hazardous zones have been approved for use

Ensure a spill contingency plan is in place

Ensure emergency response plans are in place

9 Well heads Subject Infill wells Blow out during normal operations

Failure of subsurface valves and surface valves

Well bore ruptures Gas Migration

from reservoir

Injury Fatalities Explosion/ Fire

s

10 Well heads Subject Infill wells Line rupture due to overpressures

Process blockage (clogging due to hydrate formation)

Sizing case (blocked outlet , fire case e.t.c)

Loss of containment Jet fire Flash fire Pool fire Spill Loss of revenue Company image

concerns

Most lines have been designed for the maximum pressure

Flow lines downstream of well heads have been installed with HIPPS system

There is provision for real time flow and pressure monitoring on well heads and flow


Ensure reliability of instrumentation

Itemize all safety critical elements and list out performance standards

Carry out measures to ensure that these performance standards are met

Put adequate emergency response plans in place


Think about a recommendation


lines There is provision

for methanol injection to prevent hydrate formation

Sizing cases have been considered and blow down and depressurization philosophy have been designed to meet requirements

Fire and gas detection systems hare in place to contain the hazard

Active fire protection systems are also in place to combat fires

Operating procedures

Line rupture due to over/ under temperature during normal operations

Hydrate formation Thermal

expansion due to radiation from adjacent falre

Metal embrittlement due to low temperature

Loss of containment Jet fire Flash fire Pool fire Spill Loss of revenue Company image

concerns

Most lines have been designed for the maximum pressure

Flow lines downstream of well heads have been installed with HIPPS system

There is provision for real time flow and pressure monitoring on well heads and flow lines

There is provision for methanol injection to prevent hydrate formation

Provision has been made for temperature monitoring on well head installation

Facility has been


Ensure reliability of instrumentation

Itemize all safety critical elements and list out performance standards

Carry out measures to ensure that these performance standards are met

Put adequate emergency response plans in place

Operating procedures


located to ensure that flaring doesn’t impact on it. However there is a plan to phase out the existing flare in the adjacent flow station faciities

Fire and gas detection systems hare in place to contain the hazard

Active fire protection systems are also in place to combat fires

11 Well heads Subject facilities Onsite traffic hazards during normal operations

Vehicular damage to existing flow lines and manifold

Increase risk of accidents within the facility due to the increased movement frequencies

Driver fatigue Non adherence to

speed limits

Loss of containment Fire Explosion Damage to existing

well heads Financial loss Injury Fatality

Access roads to the drilling site have been marked

There is a fence barrier within the well enclosure

Fire and Gas detection system is installed on existing well heads

Shutdown procedures in place to control hazards

Ensure speed limits are enforced

Consider a vehicle tracking system to help enforce speed limits

Consider discouraging private transportation for drilling site workers. Provide public transportation systems for every drilling worker to minimize the frequency of Vehicular activity

Ignition suppression measures should also be in place.


Loss of vital utility systems (power, air, fuel gas/oil)

Power failure Instrument Tubing

failure Loss of supply of

fuel gas oil Loss of

containment of fuel gas oil

Loss of plant air

Disruption in normal operations

Instrument failure Project delays Loss of revenue

All instrumentation systems are designed to be fail safe

Ensure redundancy of critical instrument functions


These Items need to be considered by site visitors

Documents

Correct Hazid Checklister