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KINGDOM OF S UDI R BI
MINISTRY OF INTERIOR
HIGH COMMISSION
OR
INDUSTRI L SECURITY
S FETY ND FIRE PROTECTION DIRECTIVES
OR
INDUSTRI L F CILITIES
SAF 07
Wellsite Safety
Issue Date I2I6 1431H 126 05 2010
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Kingdom of Saudi Arabia
Ministry of Interior
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High Commission
for
Industrial Security
Secretariat General
SAF 07 Wellsite Safety
Issue
Date: 12 6 1431H 126 05 2010
TABLE OF CONTENTS
I Administration
1 1 Scope
1.2 Application
3
3
1.3 Conflicts and Deviations 3
2 Definitions 4
3 References 7
4 General Requirements 8
4.1 Spacing - Occupied Buildings 8
4.2 Rupture Exposure Radius 9
4.3 Unoccupied Agricultural
Developments 9
4.4 Water and Gas Injection Wells 9
4.5 Well Burn Pits 9
4.6 Additional Safety
Measures for Populated Areas
4.7 Automatic Closure 12
4.8 High-Pressure Gas Wells 12
4.9 Wellhead Equipment 12
4.10 Automated Safety Systems
12
4.11 Suspen ded
We lIs 13
4.12 Vehicle Barrier 13
4.13 Fencing in Populated Areas 13
4.14 Indication of Wind Direction 13
4.15 Access to Wellsites 13
Table I Minimum Spacing from
Oil and Gas Wells 8
Table 2 Minimum Spacing from
Well Burn Pits 10
Figure I - Example of Wellhead 14
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Kingdom
of
Saudi Arabia
Ministry
ofInterior
High Commission for Industrial Security
Secretariat General
SAF-07 Wellsite Safety
1 Administration
1 1 Scope
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This Directive provides the minImum requirements for companies and
establishments that are subject to the supervision of the High Commission for
Industrial Security HCIS), Ministry of Interior, for onshore wellsite layout,
wellhead protection, access, and flow isolation for all wells including oil and gas
production wells, hydrocarbon injection wells, observation wells, abandoned wells,
suspended wells, and wellsite facilities located onshore. Water injection, disposal,
and supply wells that are open to or pass through a geological zone and could
produce hydrocarbons, are also covered by this directive.
1 2 Application
This Directive is applicable to all facilities, including new projects, the expansion
of existing facilities, and upgrades. For application to existing facilities, the Owner
shall assess his facilities against the requirements of these Directives and
coordinate with the General Secretariat of the HCrS to comply with the security,
safety, and fire protection requirements according to these Directives and add to or
modifY the existing facilities as required. Where the General Secretariat
of
the
HCIS has assessed deficiencies
in
existing facilities during a survey, comparing the
current state of the facilities to the requirements of these Directives, those identified
deficiencies shall be corrected by the Owner.
1 3 Conflicts and Deviations
Where implementation of a requirement is unsuitable or impractical, where other
equivalent company or industry Standards and Codes are followed, or where any
conflict exists between this Directive and other company standards and Codes, the
deviations shall be resolved by the General Secretariat of the HCIS. Deviations
lower than the requirements of this Directive shall be listed and submitted in a
report
of
non-compliance, with justification and rationale for not following the
requirement, and approval shall be received from the General Secretariat of the
HCIS prior to implementation. The documents shall be retained by the company
in
its permanent engineering files.
Issue Date:
12 6I1431H 126 05 2010
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without
written pennission from HCIS
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Kingdom of Saudi Arabia
Ministry ofInterior
High
Commission for
Industrial Security
Secretariat General
SAF-07 Wellsite Safety
2.
Definitions
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Absolute Opeu Flow AOF): In general tenus, the rate of flow that would be
produced by a gas well or oil well if the only back-pressure at the surface is
atmospheric pressure, e.g. the complete unrestricted maximum produced fluid flow
rate.
API: American Petroleum Institute, Website: http://api-ec.apLorg/
Blow-Out Preveuter BOP): A blowout preventer is a large valve that can seal off
an oil or natural gas well during drilling operations.
If
a kick see definition below)
is
experienced, operators can close the valve t forestall a blowout and regain
control of the wellbore.
Choke: An adjustable pressure control valve that
is
used to control backpressure
on the well. Controlling the backpressure adjusts the production rate of the well.
Drilling Pad A compacted area ofmarl located at the well site. The drilling pad is
required to be level for use by drilling and workover rigs.
Fail-safe: Describes a device which,
in
the event of failure, it will respond in a
way that will cause no hanu or minimize hanu to equipment or personnel.
GOSP: A gas oil separation plant GOSP)
is
a plant area where water and gas are
separated from the produced crude oil so that the oil
is of
suitable quality for
shipping through a pipeline to an oil terminal or to a refinery. The gas is sent to gas
plants for further processing.
HCIS: High Commission for Industrial Security, Ministry ofInterior.
High Pressure HP) Well: Wells where the shut in wellhead pressure
is
expected
to exceed 20,700 kPll(gauge) 3000 psig).
kV: Kilovolts 1000 volts)
kPa: Kilopascals
Listed: Equipment, materials, or services that meet an appropriate designated
Standard or Code or that have been tested and found suitable for a specified
purpose. FM and
U
are two internationally recognized organizations with listings
of equipment, materials, and services.
ssue
Date:
12I6/143 H 126 0512010
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Kingdom
of
Saudi Arabia
Ministry
of Interior
High Commission for Industrial Security
Secretariat General
SAF-07
Wellsite Safety
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Kingdom
o
Saudi Arabia
Ministry ofInterior
High
Commission for Industrial
Security
Secretariat General
SAF-07
Wellsite Safety
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Ppm: Concentration o gas or vapor in air, e.g. concentration o hydrogen sulfide
gas in air
in
parts o gas or vapor per million parts o air by volume at 25 degrees C
and 1 atmosphere o pressure.
Psig: A common unit o pressure in pounds per square inch gauge.
Rupture Exposure Radius RER):
1 For toxic effects, the rupture exposure radius refers to the horizontal distance
from a leak source to a specified level o hydrogen sulfide (H,S)
concentration in parts per million (ppm).
2) For a flammable gas or vapor hazard, the rupture exposure radius refers to
the horizontal distance from a leak source to the
z
lower flammable limit
LFL).
Shall: Indicates a mandatory requirement.
Should: Indicates a recommendation or that which is advised but not required.
Surface Safety Valve SSV):
An automated spring-assisted fail-safe valve
installed on a wellhead to automatically shut in flow during an abnormal condition
such as high or low pressure
o
the flowline. The SSV can be the upper master
valve, a wing valve (upstream o choke), or a production valve (downstream o the
choke).
Suspeusiou Procedure:
Wireline or workover rig procedures for securing a
standing well from production
on
a long-term basis.
Subsurface Safety Valve SSSV): An automated valve installed below ground
level in the tubing string o an oil or gas well. The SSSV is used to shut in flow
during an abnormal condition. SSSVs, when required, are installed 60 meters or
more below ground level per API RP 14B.
Wellhead: The valve manifold directly at the top o the well bore. The wellhead
consists o several specialized valves including the following (see Figure
1 :
a)
Crowu Valve:
Topmost valve o the wellhead. This valve
is
used for
wire line and coil tubing access to the well.
Issue Date:
12 6 1431H 26105 2010
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HCIS. Copying
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pennission from HCIS
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Kingdom of Saudi Arabia
Ministry of Interior
High
Commission
for
Industrial Security
Secretariat
General
SAF 07 Wellsite Safety
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Kingdom o Saudi Arabia
Ministry ofInterior
High
Commission
for
Industrial
Security
Secretariat General
SAF-07 Wellsite Safety
4. General Requirements
4.1
Spacing - Occupied Buildings
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4.1.1 Wellsites shall be located away from population such that no occupied building,
compound, shopping complex, office building, major plant facility, factory, or
similar occupied development, whether permanent or temporary, is within the
well s 100 parts per miIlion hydrogen sulfide rupture exposure radius (ppm
H2S
RER) or
y
lower flammable limit (LFL) RER i well control is lost during driIling
or well maintenance workovers.
Exception: Facilities incidental to operating and producing the wells (such as
collection pipelines, distribution headers, separation or storage facilities, test
separators) may be within the
100 ppm
H2S
RER
o
the well
as
required.
4.1.2
Spacing from a well shall be measured from the nearest fence or other land mark.
4.1.3 For industrial, military, and other larger non-residential land claims, determine the
spacing based on the nearest anticipated development within the confines o the
fence during the anticipated period o driIling.
Table Minimnm Spacing from Oil and Gas Wells
Divided
Railroads
Major electrical distribution centers·
buildings·, major facilities·
flares and
burn
similar facilities·
Issue Date: 12 6 1431H 126 0512010
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450
450
450
1000
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Kingdom of Saudi Arabia
Ministry ofinterior
High Comm ission for
Industrial Security
Secretariat General
SAF-07 WeJlsite Safety
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' I f the H,S RER is greater than the distance stated in this table, use the 100 ppm H,S RER for
spacing, Section
4 1
shall be used for well spacing from occupied buildings, major facilities,
hospitals and schools and similar occupied facilities.
Use
the minimum spacing table only if the 100
ppm
H,S
RER is
less
4.2 Rupture Exposure Radius
4.2.1 The basis for RER calculations shall include all hydrocarbon zones to be penetrated
during drilling
of
the new well. Flow rates used for the calculation shall be absolute
open flow (AOF)
of
the well while being drilled.
4.2.2 RER calculations shall be done with best available computer models available for
dispersion modeling of natural gas and oil releases in air.
4.2.3 The RER calculations shall be done by personnel having experience with drilling
and its potential hazards and having experience
in
computer dispersion modeling.
All studies and resulting RERs shall be kept
as
part ofthe Owner s permanent well
records.
4.3 Unoccupied Agricultural Developments
Unoccupied buildings and other structures of agricultural developments and
unoccupied farms are allowed to be within the 100 parts per million (ppm) H
2
S
RER but not within the
Y
LFL RER. The minimum spacing shall be
no
less than
100m.
4.4 Water and Gas Injection Wells
4.4.1 Water gravity injector, power injector, and supply wells that penetrate hydrocarbon
fonnations shall be located the same
as
hydrocarbon producing wells.
4.4.2 Water injection and supply wells that
do
not penetrate hydrocarbon bearing
fonuations shall have a basic 60 meters minimum spacing requirement from plant
equipment, buildings, etc. Gas injection wells shall use the same location criteria
as
producing gas wells.
4.5 Well Burn Pits
Well burn pits shall be subject to the same spacing from population and major
facilities
as
well spacing. Minimum spacing shall meet Table 2 below.
Issue Date 12 6 1431H 126 05 2010
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prohibited without
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Kingdom
o Saudi Arabia
Ministry
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Kingdom
of
Saudi Arabia
Ministry
ofInterior
High Commission for Industrial Security
Secretariat General
SAF 07
Wellsite Safety
4.6 Additional Safety Measures
for
Populated Areas
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4.6.1 Wells
in
a populated area shall implement the following additional precautionary
measures in addition to the normal drilling safety program during drilling of
hydrocarbon zones or during well maintenance.
4.6.2
An emergency response plan shall be
in
place to meet SAF-20, Pre-Incident
Planning and Management of Emergencies. The emergency response plan for all
wellsite related operations
in
populated areas shall include identification
of
occupied buildings, compounds, shopping complexes, office buildings, manned
plant facilities, factories, or similar occupied developments, whether permanent or
temporary, within 5 kilometers
of
a drilling location. The wellsite Owner shall
acquire the emergency contact phone numbers for each and create a protocol and
means to communicate with public agencies, to summon offsite assistance, and, if
need be, to warn the occupants
of
potentially impacted developments. Refer to
SAF-20 for details.
4.6.3 Rig-site
H2S
continuous gas detection monitoring systems, making certain the rig
site and remote H2S monitoring systems are installed
in
adequate numbers and
locations and that they work correctly and measure accurately
(if
H2S
is in
the
formation being drilled). The gas detection systems shall be listed.
4.6.4 Additional kill-weight drilling fluid mud) available near the drillsite for immediate
use in an emergency.
4.6.5 A Blow-Out Preventer BOP) stack with pipe rams or blind rams and shear rams
with capability
of
cutting the drill pipe shall be in place and operational on the rig.
4.6.6 On-site coverage 24 hours-a-day by on-site foremen with authority and the means
for immediate ignition
of
the well without prior management approval
in
the event
of
loss
of
well control.
4.6.7 Capability
of
safely incinerating natural gas and handling other fluids
in
a
controlled way by using equipment designed for such service during a kick.
4.6.8 Under no circumstances shall population or manned facilities be exposed to over 30
parts per million H
2
S gas concentration for more than I hour.
4.6.9 For existing wells in populated areas, the special precautions in Section 4.6 shall
also be used for well maintenance workovers. Stimulation and wireline work
on
Issue
Date: 12i6/1431H
126 05 2010
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Ministry
ofinterior
High Commission for Industrial Security
Secretariat General
SAF 07
Wellsite Safety
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Kingdom o Saudi Arabia
Ministry
ofInterior
High Commission for
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Security
Secretariat General
SAF 07 Wellsite afety
4.11
Suspended Wells
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Suspended wells shall be suspended
in
accordance with established procedures
documented by the Owner. Suspension procedures, equipment in the well and other
related records shall be kept as part o the Owner s permanent well records.
4.12 Vehicle Barrier
All wellheads shall be protected with a barrier to prevent work vehicle impact.
4.13 Fencing
in
Populated Areas
Wellsites
in
populated areas shall be enclosed by a fence that meets Security
Directive SEC-02, Security Fencing. For other producing related facilities, the
Owners shall ensure that they provide an adequate level
o
security measures to
protect their facilities by applying the requirements o
SEC O
I, Application o
Security Directives, and other security directives issued by the HCIS.
4.14 Indication o Wind Direction
A wind sock pole shall be permanently installed at each hydrocarbon production or
injection wellsite in populated areas.
4.15 Access to Wellsites
Two accessways shall be available to each wellsite. Each access shall be wide and
high enough to allow unobstructed rig and heavy vehicle access and oriented 90 to
270 degrees from each other.
Issue Date: 12 6 1431H 12610512010
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Kingdom
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Ministry ofinterior
High Commission for Industrial Security
Secretariat General
SAF 07
Wellsite Safety
QUICK UNION TREE CAP
SWAB OR CROWN
VALVE _
WING VALVE
::::::= F:::
UPPER MASTER VALVE AS
HYDR ULIC CTU TED SSV
LOWER MASTER VALVE too
Figure Example
of Wellhead
Issue Date:
lUG 143m 126 05 2010
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ll Rights
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HeIs Copying
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