D-002 System requirements well intervention equipment

NORSOK STANDARD

SYSTEM REQUIREMENTS WELL INTERVENTION

EQUIPMENT

D-002

Rev. 1, October 2000

This NORSOK standard is developed by NTS with broad industry participation. Please note that whilst every effort has been made to ensure the accuracy of this standard, neither OLF nor TBL or any of their members will assume liability for any use thereof. NTS is responsible for the

administration and publication of this standard.

Norwegian Technology Center

Oscarsgt. 20, Postbox 7072 Majorstua

N-0306 Oslo, NORWAY

Telephone: + 47 22 59 01 00 Fax: + 47 22 59 01 29

Email: norsok@nts.no Website: http://www.nts.no/norsok

Copyrights reserved

CONTENTS

FOREWORD2 INTRODUCTION2 1SCOPE5 2NORMATIVE REFERENCES5 3TERMS, DEFINITIONS AND ABBREVIATIONS7

3.1Definitions7

3.2Abbreviations7 4GENERAL REQUIREMENTS8

4.1General8

4.2Design principles8

4.3Design principles references and standards8

4.4Verification, testing and marking13

4.5LCC and regularity15

4.6Process and ambient conditions15

4.7Layout and working environment requirements15

4.8Special requirements for skid base structures16

4.9Utility interfaces16

4.10Operational requirement17 5WELL INTERVENTION WELL CONTROL SYSTEM18

5.1Equipment configuration18

5.2Equipment requirements21

5.3Control system30 6SNUBBING EQUIPMENT35

6.1General35

6.2Snubbing equipment requirements36

6.3Data acquisition system39

6.4Power package40

6.5Circulating system40

6.6Well control system40

6.7Workstring and BHA41 7COILED TUBING EQUIPMENT42

7.1General42

7.2Coiled tubing equipment requirements42

7.3Power package46

7.4Coiled tubing workstring (steel coiled tubing)46

7.5Coiled tubing reel47

7.6Control cabin48

7.7Data acquisition system49

7.8Well control system49

7.9BHA50 8WIRELINE EQUIPMENT51

8.1General51

8.2Wireline equipment requirements51

8.3Control cabin52

8.4Data acquisition52

8.5Clamps/sheaves and hay pulleys53

8.6Power package53

8.7Pressure test pump54

8.8Wellhead pump54

8.9Well control system54

8.10Logging container (for logging and well tractor)54

8.11Wireline mast (crane)54

8.12Transport and storage racks for wireline equipment54

8.13Slick, braided and electrical line requirements55

8.14Down hole tools requirements55 9DOCUMENTATION56

9.1General56

9.2Specific well intervention requirements58 ANNEX A60 (informative)60 DATA SHEET SNUBBING EQUIPMENT60 ANNEX B63 (informative)63 SAFETY HEAD REQUIREMENTS, COILED TUBING AND SNUBBING OPERATIONS63 ANNEX C65 (informative)65 SNUBBING AND COILED TUBING WELL CONTROL SYSTEM RIG UP65 ANNEX D66 (informative)66 WIRELINE WELL CONTROL SYSTEM RIG UP66 BIBLIOGRAPHY67

FOREWORD

NORSOK (The competitive standing of the Norwegian offshore sector) is the industry initiative to add value, reduce cost and lead time and eliminate unnecessary activities in offshore field developments and operations.

The NORSOK standards are developed by the Norwegian petroleum industry as a part of the NORSOK initiative and supported by OLF (The Norwegian Oil Industry Association) and TBL (Federation of Norwegian Manufacturing Industries). NORSOK standards are administered and issued by NTS (Norwegian Technology Center).

The purpose of NORSOK standards is to contribute to meet the NORSOK goals, e.g. to develop standards that ensure adequate safety, value adding and cost effectiveness and thus are used in existing and future petroleum industry developments.

The NORSOK standards make extensive references to international standards. Where relevant, the contents of a NORSOK standard will be used to provide input to the international standardisation process. Subject to implementation into international standards, the NORSOK standard will be withdrawn.

Annexes A, B, C and D are for information only.

INTRODUCTION

The main objective of this NORSOK standard is to contribute to optimise the design of well service and intervention facilities, their systems and equipment with respect to utilisation, operational efficiency, life cycle cost and to stipulate acceptable safety levels.

NORSOK standard D-002 is an overall improvement and expansions of the former standards for coiled tubing, snubbing and wire line equipment, and replace the following NORSOK standards:?D-SR-005Coiled tubing equipment, revision 1 – January 1996

?D-SR-006Snubbing equipment, revision 1 – January 1996

?D-SR-008Wireline equipment, revision 1 – October 1996

1SCOPE

This standard describes the design, installation and commissioning principles and requirements for the well intervention equipment and their systems and equipment.

2NORMATIVE REFERENCES

The following standards include provisions which, through reference in this text, constitute provisions of this NORSOK standard. Latest issue of the references shall be used unless otherwise agreed. Other recognized standards may be used provided it can be shown that they meet or exceed the requirements of the standards referenced below.

NPD Regulations

NORSOK D-001, Drilling facilities.

NORSOK E-001 Electrical systems,

NORSOK E-002Adjustable speed motor drives.

NORSOK H-001HVAC Heating, ventilation and air conditioning

NORSOK N-001, Structural design.

NORSOK N-003, Actions and action effects.

NORSOK S-001, Technical Safety.

NORSOK S-002, Working Environment.

NORSOK S-003, Environmental Care.

NORSOK Z-010Installation of Electrical, Instrument & Telecommunication

NORSOK Z-015, Temporary Equipment.

ISO 10423Petroleum and Natural Gas Industries – Drilling and Production Equipment –Specification for Valves, Wellhead and Christmas Tree Equipment

ISO 10424Petroleum and Natural Gas Industries – Drilling and production equipment –Rotary drilling equipment

ISO 13533Petroleum and Natural Gas Industries – Drilling and production equipment –Specification for drill through equipment

ISO 13535Petroleum and Natural Gas Industries – Drilling and production equipment –Hoisting equipment

ISO 13626Petroleum and Natural Gas Industries – Drilling and production equipment –Drilling and well servicing structures – Specification

ISO 14693Petroleum and Natural Gas Industries – Drilling and production equipment –Drilling equipment

API Spec 4F Drilling and well servicing structures

API Spec 5CT Specification for Casing and Tubing (U.S. Customary Units)

API Spec 6A Specification for Wellhead and Christmas Tree Equipment

API Spec 7Specification for Rotary Drill Stem Elements (replace with ISO 10424 when issued)

API Spec 7K Specification for Drilling Equipment

API Spec 8C Specification for Drilling and Production Hoisting Equipment (PSL 1 and PSL

2), (replace with ISO 13535 when issued)

API Spec 9A Specification for Wire Rope

API Spec 16A Specification for Drill Through Equipment, (replace with ISO 13533 when issued)

API Spec 16C Choke and kill system

API Spec 16D Specification for Control Systems for Drilling Well Control Equipment.

BS 308: Parts 1, 2 & 3Recommendations for geometrical tolerancing.

BS 449Specification for the use of structural steel in building. Metric units.

BS 4656: Part 1Accuracy of machine tools and methods of test. Specification for lathes,

general purpose type

BS 4656: Part 2Accuracy of machine tools and methods of test. Specification for copying

lathes and copying attachments

BS 4656: Part 3Specification for the accuracy of machine tools and methods of tests. Milling machines, knee and column type, horizontal or vertical spindle plain

BS 4656: Part 4Specification for the accuracy of machine tools and methods of test. Milling machines, bed type, horizontal or vertical spindle

BS-7072Code of practice for inspection and repair of offshore containers

NACE-MR-0175,Sulphide Stress Cracking Resistant Metallic Materials for Oilfield Equipment. NACE-TM-0177Labory Testing of Metals Resistance to Sulfide Stress Cracking and Stress

Corrosion Cracking in H2S Environment. Item no 21213

ASME VIII Div. 1 and Div. 2, Pressure vessel code

NS 3472Steel structures – Design rules

NS 5820,Suppliers documentation of equipment.

DNV Offshore standard OS-E101 Drilling Plant

DNV Lifting Appliance

ANSI/ASME B31.3Process Piping

ANSI/AWS D1.1Structural Welding Code - Steel

ASTM-E466-82Standard Practice for Conduction Force Controlled Constant Amplitude Axial Fatigue Tests of Metallic Materials

ASTM-E468-90Standard Practice for Presentation of Constant Amplitude Fatigue Test Results for Metallic Materials

ASTM-E739-91Standard Practice for Statistical Analysis of Linear or Linearized Stress-Life (S-N) and Strain-Life (e-N) Fatigue Data

ASTM-A450Standard Specification for General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes

IEC 60068Environmental testing

FEA-M Forskrifer for elektriske anlegg. Maritime installasjoner. Norsk Vassdrags og Energiverk (NVE).

3TERMS, DEFINITIONS AND ABBREVIATIONS

For the purpose of this NORSOK standard, the following terms, definitions and abbreviations apply.

3.1Definitions

3.1.1

barrier

envelope of one or several dependent barrier elements preventing fluids or gases

from flowing unintentionally from the formation, into another formation or to surface

Shall:Verbal form used to indicate requirements to be followed in order to conform to the standard.

Should:Verbal form used to indicate that among several possibilities one is

recommended as particularly suitable, without mentioning or excluding others,

or that a certain course of action is preferred but not necessarily required. May:Verbal form used to indicate that among several possibilities, one is suitable, without mentioning or excluding others, but not necessarily required.

3.1.2

qualified

special proof for being fit for the intended purpose

NOTE To be documented by design, calculation and function testing and verified by 3 rd party or

independent surveyor.

3.1.3

maximum expected wellhead pressure

maximum shut in wellhead pressure plus additional pressure from well intervention activities

3.2Abbreviations

BHA bottom hole assembly

BOP blow out preventer

BPV back pressure valve

CE European Conformity Assessment Mark

EEA European Economic Area

ESD emergency shut down

FAT factory acceptance test

HVAC heating ventilation and air conditioning

LCC life cycle cost

MTBF mean time between failure

MTTR mean time to repair

NPD Norwegian Petroleum Directorate

UPS un-interruptable electrical power supply

ANSI American National Standards Institute

ASME American Society of Mechanical Engineers

ASTM American Society for Testing and Materials

BS British Standards

DNV Det Norske Veritas

NACE National Association of Corrosion Engineers

NS Norsk Standard

FEA-M Forskrifer for elektriske anlegg. Maritime installasjoner. Norsk Vassdrags og Energiverk (NVE).

4GENERAL REQUIREMENTS

4.1General

The well intervention equipment shall be designed, built and equipped in compliance with applicable regulations and this NORSOK standard.

4.2Design principles

An overall objective for well activities shall be the requirement that no single failure shall entail a life-threatening situation for the involved personnel, or significant damage to material and the environment. This applies both to operational errors and to failure in connection with equipment used directly in operations, as well as equipment with auxiliary functions.

The objectives shall constitute the basis for definition and revision of the acceptance criteria for risk in connection with well activities, and for the choice of risk reducing measures.

System and equipment are to be protected against excessive loads and pressure.

System and equipment are to provide two independent levels of protection to prevent or minimise the effects of a single malfunction or fault in the process equipment and piping system, including their controls.

Different types of safety devices to reduce the probability for common cause failures should provide two levels of protection.

All equipment shall be located to ensure safe operation and, if located in hazardous areas, shall be suitably protected for installation in such areas. Reference is made to NORSOK standard Z-015 regarding relevant discipline requirement for design and installation of service containers, such as fire and gas, electrical, HVAC, etc. for temporary equipment.

The facilities shall be designed to minimise risks of personnel injuries, environmental hazards and economic loss. Reference is made to NORSOK standard S-001, NORSOK standard S-002, NORSOK standard S-003 and NPD Regulations.

4.3Design principles references and standards

NORSOK, ISO and API standards constitute a good starting point as regards reference documentation when designing well intervention equipment.

Planning, design, fabrication, operation and maintenance of well intervention equipment shall be according to documents listed in Table 1, Table 2, Table 3, Table 4 and Table 5.

Table 1Snubbing

Note: ( ) means standards under preparation

Equipment Norsok ISO API Other

Substructures / masts / gin pole N-001(13626)4F NS-3472 Steel structures – Design rules

BS-7072 Code of practice for inspection and

repair of offshore containers

DNV Lifting Appliance

DNV Offshore standard OS-E101 Drilling

Plant

Pipe handling system;DNV Offshore standard OS-E101 Drilling Plant

Jack/pulling unit;(13535)8C DNV Offshore standard OS-E101 Drilling

Plant

Rotary / power swivel (13535)8C DNV Offshore standard OS-E101 Drilling

Plant

Work window N-001(13626)4F NS-3472

DNV Offshore standard OS-E101 Drilling

Plant

Slip bowls / carriers (13535)

(14693)

8 C

7K

DNV Offshore standard OS-E101 Drilling

Plant

Make up / brake out tongs (14693)7K DNV Offshore standard OS-E101 Drilling

Plant

Winch package / hoisting equipment 9A DNV Offshore standard OS-E101 Drilling Plant

Circulating swivel(10423)

(15156)6A NACE-MR-0175

DNV Offshore standard OS-E101 Drilling

Plant

Kelly valves(13535)

(10424)

(15156)8C

7

NACE-MR-0175

DNV Offshore standard OS-E101 Drilling

Plant

Workstring(10424)

(11960)7

5CT

BHA9001:

Chapter

4.5 4.7

& 4.16BS 308: Parts 1, 2, & 3. BS 4656: Parts 1, 2, 3, & 4.

Table 2Coiled Tubing

Norsok ISO API Other

Substructures N-001NS-3472

BS449

BS7072

DNV Lifting Appliance

DNV Offshore standard OS-E101 Drilling

Plant

Injector head w/ Tubing guide arch (gooseneck), Injector support frame(s) & Injector lifting frame N-001

NS-3472

BS-449

BS7072

ANSI B31.3

AWS D1.1

DNV Lifting Appliance

DNV Offshore standard OS-E101 Drilling

Plant

Coiled tubing

workstring (steel

coiled tubing)

(11960)

(15156)

90015CT,

5C7

NACE-TM-0177

NACE- MR- 0175

ASTM-E466-82

ASTM-E468-90

ASTM-E739-91

ASTM-A450

ASME- sec. VIII Div.1&2

Coiled tubing reel Z-015NS-3472

BS449

BS7072

DNV Lifting Appliance

DNV Offshore standard OS-E101 Drilling

Plant

BHA9001:,

Chapter

4.5 4.7

4.16BS 308: Parts 1, 2, & 3. BS 4656: Parts 1, 2, 3, & 4.

Table 3Wireline

Norsok ISO API Other

Substructures N-001DNV Offshore standard OS-E101 Drilling

Plant

Wireline unit Z-015DNV Offshore standard OS-E101 Drilling

Plant

Clamps/sheaves and hay pulley;DNV Offshore standard OS-E101 Drilling Plant

Pressure test pump Z-015DNV Offshore standard OS-E101 Drilling

Plant

Wellhead pump Z-015DNV Offshore standard OS-E101 Drilling

Plant

Wireline mast

(crane)

(13626)4F

Slick, braided and electrical line down hole tools BS 308: Parts 1, 2, & 3. BS 4656: Parts 1, 2, 3, & 4.

Table 4Snubbing Coiled Tubing and Wireline – General Equipment Norsok ISO API Other

Operator cabin w/ Control system & Data acquisition system H-001

Z-015

9241IEC60068

Hydraulic power pack Z-015 Z-010

Circulating system(10423)

(15156)6A

NACE-MR-0175

DNV Offshore standard OS-E101 Drilling

Plant

Chiksan / stand pipe (10423)

(15156)

6A

NACE-MR-0175

ANSI B.31.3

DNV Offshore standard OS-E101 Drilling

Plant

Circulation hoses(15156)NACE-MR-0175

ANSI B.31.3

DNV Offshore standard OS-E101 Drilling

Plant

Lifting

requirements

Z-015

Containers Z-015

Electrical equipment design and installation Z-010

Z-015

E-001

E-002

FEA-M (1990)

Table 5Well Control Equipment

Norsok ISO API Other

BOP's for snubbing, coiled tubing and wireline ; stripper rams, blind/shear ram, pipe rams ( fixed or variable ), slip rams , shear seal rams & safety head

wireline ram (13533)

(15156)

16A

NACE-MR-0175

DNV Offshore standard OS-E101

Drilling Plant

Annular preventer(13533)

(15156)16A

NACE-MR-0175

DNV Offshore standard OS-E101

Drilling Plant

Snubbing stripper bowl or active stripper.(13533)

(15156)

16A

NACE-MR-0175

DNV Offshore standard OS-E101

Drilling Plant

CT dual stripper(13533)

(15156)16A

NACE-MR-0175

DNV Offshore standard OS-E101

Drilling Plant

Gate & plug valves, check valves and loops (10423)

(15156)

6A

NACE-MR-0175

DNV Offshore standard OS-E101

Drilling Plant

Stuffing box for solid wireline - Slickline (10423)

(15156)

6A

NACE-MR-0175

Grease injection head with relevant sized flowtubes -Braided cable (10423)

(15156)

6A

NACE-MR-0175

Hydraulic line wiper and stuffing box, Open hole operations (10423)

(15156)

6A

NACE-MR-0175

Choke & kill systems

(15156)16C

NACE-MR-0175

DNV Offshore standard OS-E101

Drilling Plant

BOP accumulator unit system w/ BOP control hoses Z-015

Z-010

E-001

E-002

16D

16E

DNV Offshore standard OS-E101

Drilling Plant

FEA-M (1990)

4.4Verification, testing and marking

4.4.1Verification

Verification of design, fabrication and testing shall be carried out and implemented according to an overall and clearly defined verification programme and verification basis There shall be independence between those who carry out the work, and those who are responsible for the verification.

The verification may thus comprise control of calculations, drawings and fabrication by going through what have been done or carrying out independent or own calculations. The verification may also include trials or testing of equipment and systems.

By independence means that the verification shall be carried out by someone other than the one who has performed the work which is to be verified, or the one who has prepared the verification basis, and also that there shall be organisational independence regarding reporting in the chain of command.

An important condition is that the verifying unit has the necessary competence and resources to carry out the verification. Verifications shall be carried out in accordance the requirements in this NORSOK standard. Consideration of complexity shall be included in the evaluation, as well as the probability for or the consequences of failure or faults, which may occur.

The verification shall be documented and should comply with issuance of e.g. design verification report and product certificate.

4.4.2Testing requirements for new equipment

The various vendors shall present a test procedure, including acceptance criteria, prior to the FAT. The procedure shall describe all tests to be carried out during the FAT and procedures for commissioning and the start-up phase for the equipment as a stand-alone unit.

At FAT the well intervention equipment shall, to the extent possible, be tested as a complete system, with all subsystems integrated. Loads and signals shall be simulated and recorded.

During commissioning and start-up, the various systems and their drilling instrumentation package shall be utilised to verify the sensor data.

4.4.3Marking

Equipment shall be clearly marked as follows with identification and operational limitations, relating the equipment to certificates and fabrication documentation:

Equipment identification:

?manufacturer’s name or mark;

?equipment type no.;

?equipment serial no.

Operational limitations such as:

?working load limit;

?working pressure;

?maximum voltage;

?maximum temperature.

There shall be consistency between units used for marking and units displayed on instruments.

CE marking applies to machines and simple pressure vessels on fixed installations.

Machinery placed on the market after 8 April 1995 shall be designed, manufactured and documented in accordance with the requirements of the Machinery Directive 98/37/EC/Forskrift om maskiner Best. nr. 522. The requirement entails that the individual contractor, sub-contractor etc. shall ensure that machinery taken into use has received CE marking and that it is accompanied by a declaration of conformity.

By marketing (?place on the market?) is meant the first time a product, against payment or free of charge, is placed at disposal with a view to distribution or use within the EEA. The NPD has in co-operation with other authorities, defined the following criteria for when a product is considered placed on the market:

?when the right to utilize of the product passes over from a manufacture within the EEA area to the next link in the chain of distribution;

?when the equipment is imported from a country outside the EEA area, and the right to utilize of the product passes over from importer to the next link in the chain of distribution;

?when the equipment was offered and is available for direct sale from the manufacture or from an importer and the purpose was to direct sale to users;

?when a manufacturer or an importer takes into use equipment imported by him.

The requirement contained in this section applies only to machinery comprised by the Machinery Regulations. This entails that the requirement applies only to machinery used on fixed installations. The reason for this is that Machinery Regulations are not applicable to ships and mobile offshore units.

4.5LCC and regularity

Regularity requirements shall be defined prior to detailed design, based on stability (MTBF/MTTR) and service intervals. The service intervals shall reflect the MTBF. LCC shall be defined for all vital parts in the well intervention equipment.

4.6Process and ambient conditions

The well intervention equipment shall be selected and designed to operate under ambient conditions prevalent in the intended area of operation, and shall be resistant to well intervention and formation fluids.

4.6.1Design basis

The equipment shall be designed as required for the following conditions:

?ambient temperature, structures: -20 °C to + 40 °C;

?ambient temperature, machinery: -10 °C to + 40 °C;

?humidity:100%;

?for conditions where H2S service is required, NACE MR-0175 applies.

The design basis shall be defined for the following load combinations:

?operational load;

?snow and ice loads;

?earthquake conditions (optional);

?impact from transportation;

?wind conditions;

?the structure shall as a minimum be designed for continuos operation with regards to hook load, rotary load for wind speeds up to 30 m/s, 10 min. mean values, considering a reference height of

50 m above lowest astronomical tide, unless otherwise specified.

4.7Layout and working environment requirements

4.7.1General

All work areas in connection with well intervention equipment shall be arranged to ensure the safety of personnel and operations, working environment and pollution control, in accordance with NORSOK standard S-001, NORSOK standard S-002 and NORSOK standard S-003 and project safety goals.

The layout of the well intervention equipment shall give due consideration to areas that may be critical to dropped objects, especially in connection with materials and equipment handling.

The layout shall ensure that maintenance and service can be carried out in a safe and ergonomically efficient way.

4.7.2Noise protection requirements.

Special attention hall be made to requirements defined in the NORSOK standard S-002 for design of cabins, power generation packages, fluid and N2 pumping units and accumulator packages.

The control cabins for snubbing, coiled tubing, wireline equipment and pumping units shall be designed to withstand a total outdoor area noise level impact of 90 dB (A) and be designed according to values defined in NORSOK standard S-002, annex A, for driller cabins. The total noise level shall not exceed 65 dB (A) inside the cabin.

The power packages, fluid and N2 pumping units and accumulator packages for snubbing, coiled tubing and wireline operations shall be designed according to values defined in NORSOK standard S-002. The equipment shall be designed in such a manner that the total noise level from the equipment shall not exceed 82 dB (A) and the equipment shall not contribute to exceed a max area noise level as defined in NORSOK standard S-001, i.e. 85 dB (A) on pipe deck area.

4.7.3Material handling

The layout and design of the well intervention equipment shall ensure safe and efficient transport and handling of equipment and materials. A material handling study should be performed to secure safe and efficient operation.

4.8Special requirements for skid base structures

The skidable part of the well intervention rig up frames and structures should be installed on the platforms integrated skid beams, extending to at least one platform edge to facilitate on/off loading of modules. The frames and structures shall be designed to suit all relevant load conditions, see NORSOK standard N-001 and NORSOK standard N-003. The remaining parts of the well intervention equipment shall be located adjacent to the skidable structure.

Contaminated fluids shall be collected and routed to a dedicated slop tank system. All other fluids from the well intervention equipment, rigged up on top of the skid base substructure, shall be discharged to the installations drain points.

4.9Utility interfaces

The well intervention equipment should be supplied with dedicated interface termination points. Mechanic, electric, hydraulic and pneumatic interface connections shall be compatible with rig or platform connections.

The following utilities should typically be supplied by the platform facilities to support the well intervention equipment:

?electrical power supply;

?emergency power supply;

?fire and gas control interface;

?emergency shutdown interface;

?sea, fresh water, steam and hot water;

?drains;

?drains/vents for hydrocarbones;

?UPS;

?instrument and plant air;

?diesel;

?telecommunications interface;

?main data bus interface;

?closed circuit television interface

?bulk brine;

?HVAC;

?methanol;

?glycol (monoethylene glycol/ diethylene glycol/ triethylene glycol).

4.10Operational requirement

4.10.1Maintenance requirements

All equipment shall be subject to systematic maintenance. This is to ensure that it is in good condition if the need should arise for the use of preserved equipment.

The extent of maintenance, which is overdue, should be limited. Prior to start-up of demanding phases of the activities there should not be any maintenance on critical equipment overdue.

In order to maintain an acceptable safety level, it is important that adequate safety routines are established in connection with maintenance, e.g. in connection with pressure relief, fire protection, alerting personnel, fencing off areas etc.

The purpose of systematic maintenance is to ensure that:

?test conditions for components and equipment are specified;

?repairs and modifications are carried out in such way that an adequate level of safety is maintained;

?experience data are systematically collected and recorded for improvement of equipment and operations;

?experience data are reported back to the manufacturer/supplier.

4.10.2Testing requirements

Function testing of all components including all accessory equipment shall be performed prior to each job.

Function testing of the positive and negative weight indicator system shall be performed prior to each job.

Function testing of all interfaces to permanently installed equipment and systems.

Documentation and verification to be submitted to verify acceptable rig up versus forces and bending momentum’s, downhole tools, well control system, frames, main equipment and pumps expected work conditions inside set safety limits.

5WELL INTERVENTION WELL CONTROL SYSTEM

This clause describes the mechanical well control system with associated equipment. The well control system shall comprise equipment as described below:

5.1Equipment configuration

The BOP system shall as a minimum consist of:

Primary well control system is defined as follows:

Equipment External

well control

Internal well control

Snubbing

?Stripper bowl or active stripper.?Two stripper rams ?Equalising loop system

?One annular preventer ?Workstring

?Two back pressure valves in the BHA

X

X

X

If used

X

X

Coiled tubing

?Dual stripper.

?Coiled tubing body (string)

?End connector

?One dual check valve in the BHA ?Alternatively – plugged end of coiled tubing.X

X

X

X

X

Wireline Slickline operations

Stuffing box for solid wireline.

Braided cable

Grease injection head with relevant sized flowtubes. Open hole operations

Hydraulic line wiper and stuffing box, if applicable. Primary well control system for wireline operations is dependant on type and size of line and is located above the secondary well control system.X X X