SY/T 6690-2024 Specification for well control technology of workover and interventions English, Anglais, Englisch, Inglés, えいご
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ICS
E
Professional standard of the People's Republic of China
SY/T 6690-2024
Replaces SY/T 6690-2016
Specification for well control technology of workover and interventions
井下作业井控技术规程
(English Translation)
Issue date: 2024-12-25 Implementation date: 2025-06-25
Issued by National Development and Reform Commission, P.R.C
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Well Control Risk Assessment and Control
4.1 Well Control Risk Assessment
4.2 Well Control Risk Control
5 Well Control Requirements in Design
5.1 Geological Design
5.2 Engineering Design
5.3 Construction Design
6 Selection, Installation, Pressure Testing, Use, and Maintenance of Well Control Equipment
6.1 Selection Principles
6.2 Installation
6.3 Pressure Testing
6.4 Use
6.5 Maintenance
7 Well Control Requirements During Construction
7.1 Killing Operations
7.2 Sucker Rod Tripping Operations (Running/Pulling)
7.3 Wellhead Equipment Replacement Operations
7.4 Pipe String Tripping Operations (Running/Pulling)
7.5 Sand Washing Operations
7.6 Drilling, Milling, and Grinding Operations
7.7 Stuck Pipe Release and Fishing Operations
7.8 Perforating Operations
7.9 Induced Flow Operations
7.10 Flaring and Testing Operations
7.11 Fracturing and Acidizing Operations
7.12 Snubbing (Underbalanced) Operations
7.13 Coiled Tubing Operations
7.14 Wireline (Slickline/Braided line) and Electric Line Operations
7.15 Requirements for Other Operations
8 Handling of Kicks
9 Prevention of Secondary Risks After a Kick
9.1 Fire and Explosion Prevention Measures
9.2 Poisoning Prevention Measures
10 Disposal of Blowouts
Appendix A (Informative) Examples of Well Control Equipment Configurations
Appendix B (Informative) Schematic Diagram of On-Site Flexible Line Securing
Appendix C (Normative) Soft Shut-in Procedure for Operations Without a Rig Floor
Appendix D (Normative) Soft Shut-in Procedure for Operations With a Rig Floor
Appendix E (Normative) Hard Shut-in Procedure for Operations With a Rig Floor
Appendix F (Normative) Emergency Shut-in Procedure for Snubbing Operations
Appendix G (Normative) Emergency Shut-in Procedure for Coiled Tubing Operations
Technical Specification for Well Control in Downhole Operations
1 Scope
This document specifies technical requirements for downhole operation well control, including risk assessment and control, well control requirements in design, selection, installation, pressure testing, use, and maintenance of well control equipment, well control requirements during construction, handling of kicks, prevention of secondary risks after a kick, and disposal of blowouts.
This document is applicable to the pressure control of oil, gas (steam), and water wells during downhole operations in onshore oil and gas fields. Well testing (oil/gas) with the original rig, testing with the original rig, and commissioning operations with the original rig may refer to this document for implementation.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute indispensable provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 20174 Petroleum drilling and production equipment -- Drilling and well control equipment
GB/T 20972 (All parts) Petroleum and natural gas industries -- Materials for use in H2S-containing environments in oil and gas production
GB/T 22342 Petroleum drilling and production equipment -- Design, installation, operation, test and maintenance of subsurface safety valve systems
GB/T 22513 Petroleum drilling and production equipment -- Wellhead and Christmas tree equipment
GB/T 25429 Petroleum drilling and production equipment -- Drill string non-return valves
GB/T 32474 Rubber hoses and hose assemblies for well control equipment in petroleum drilling
SY/T 0515 Specification for oil and gas separators
SY/T 5053.2 Petroleum drilling and production equipment -- Control systems for drilling wellhead control equipment and diverter equipment
SY/T 5225 Safety technology specification for fire and explosion prevention in petroleum drilling, development and storage and transportation
SY/T 5323 Petroleum and natural gas industries -- Drilling and production equipment -- Choke and kill equipment
SY/T 5325 Technical specification for conventional perforating operation
SY/T 5525 Petroleum drilling and production equipment -- Rotary drilling equipment -- Upper and lower kelly cocks
SY/T 6203 Practice of blowout fire fighting technique for oil and gas well
SY/T 6270 Petroleum drilling and production equipment -- Utilization and maintenance of cementing and fracturing manifold
SY/T 6277 Specification for personal protection in hydrogen sulfide environment
SY/T 6610 Operation safety specification for downhole operation workplace in hydrogen sulfide environment
SY/T 6751 Technical specification for wireline logging and perforating under pressure
SY/T 6989 Technical specification of snubbing operation
SY/T 6997 Technical specification for surface well testing
SY/T 7010 Blowout preventer for downhole operation
SY/T 7012 Coiled tubing well control equipment system
SY/T 7305 Technical specification for coiled tubing operation
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 20174 and the following apply.
3.1
operating without rig floor
Operations conducted without installing a rig floor at the wellhead, or with only a simple operating platform installed, where there is no dedicated access for diversion during the operation and casing valves need to be opened. It is advisable to install vent (blowout) prevention lines and kill lines.
3.2
operating with rig floor
Operations conducted with a rig floor installed at the wellhead, where there is a dedicated access for diversion during the operation and casing valves can be closed. It is advisable to install a choke manifold and a kill manifold.
3.3
sulfurous oil and gas well
A well where the total pressure of natural gas is not less than 0.4 MPa, and the partial pressure of hydrogen sulfide is not less than 0.0003 MPa, or the hydrogen sulfide content in the formation natural gas is greater than 75 mg/m³ (50×10⁻⁶).
3.4
high pressure oil and gas well
An oil or gas well with a formation pressure not less than 70 MPa or a wellhead shut-in pressure not less than 35 MPa.
3.5
high production oil and gas well
A gas well with a test production not less than 50×10⁴ m³/d or an oil well with an equivalent test production not less than 500 t/d; an oil or gas well with an actual production not less than 20×10⁴ m³/d (for gas) or an equivalent actual production not less than 100 t/d (for oil).
3.6
high sulfurous oil and gas well
A well where the hydrogen sulfide content in the formation natural gas is not less than 1500 mg/m³ (1000×10⁻⁶).
3.7
high temperature oil and gas well
An oil or gas well with a formation temperature not less than 150 °C.
3.8
high GLR well
An oil production well with a gas-liquid volume ratio greater than 300 m³/m³ and a daily gas production exceeding 3000 m³.
3.9
"three high factors" oil and gas well
A well meeting any of the conditions for a high pressure oil and gas well, a high production oil and gas well, or a high sulfurous oil and gas well.
3.10
high sensitive areas well
A well located in an area where, in the event of a blowout, the escaping fluids from the wellbore may cause significant adverse impacts on public safety or the environment.
3.11
complex structure well
A series of well types with complex structures, including twin horizontal wells, extended-reach wells, multi-lateral wells, multi-target directional wells, etc.
3.12
special process well
A well where special process techniques, other than conventional major or workover operations, are used during downhole operations, including injection for energy enhancement operations, pressure control operations, pyrotechnic operations, etc.
3.13
well integrity
The application of technical, operational, and organizational solutions to reduce the risk of uncontrolled release of formation fluids throughout the life cycle of the well.
3.14
maximum anticipated surface pressure (MASP)
