SY/T 7825-2024 The technical specifications for offshore workover English, Anglais, Englisch, Inglés, えいご
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ICS
E
Professional standard of the People's Republic of China
SY/T 7825-2024
The technical specifications for offshore workover
海上修井作业技术规范
(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 Design
4.1 Geological Design
4.2 Engineering (Technology) Design
4.3 Operational Design
5 Construction Preparation
5.1 Personnel Preparation
5.2 Equipment, Tools, and Material Preparation
5.3 Workover Fluid Preparation
5.4 Equipment Inspection and Test Run
5.5 Technical Disclosure and Safety Risk Analysis
6 Operational Procedures
6.1 Well Flushing and Killing
6.2 Removing Christmas Tree, Installing Riser and BOP Stack (Non-Subsea Wellhead)
6.3 Pulling Out and Running In Pipe/String
6.4 Checking Sand Fill, Sand Washing, Drift/Gauging and Scraping, Perforating, Fracturing, Sand Control, Fishing, Changing Wellhead Equipment
6.5 Removing Riser and BOP Stack, Installing Christmas Tree
7 Data Acquisition and Construction Summary
7.1 Data Acquisition
7.2 Construction Summary
8 Well Control and Emergency Response
8.1 Configuration Requirements for Well Control Equipment
8.2 Pressure Testing of Well Control Equipment and Manifolds
8.3 Use and Management of Well Control Equipment
8.4 Well Control Emergency Response
9 QHSE Control Requirements
9.1 Quality Control Requirements
9.2 Occupational Health, Safety and Environmental Control Requirements
Annex A (Informative) Content Framework for Offshore Workover Operational Design
Annex B (Informative) Example of Fixed Workover Rig Equipment Layout Diagram
Annex C (Informative) Content Framework for Offshore Workover Construction Summary
Annex D (Informative) Shut-in Procedure for Offshore Workover Operations (Surface BOP)
Annex E (Informative) Shut-in Procedure for Offshore Workover Operations (Subsea BOP)
Technical Specification for Offshore Workover Operations
1 Scope
This document specifies the technical requirements for the design, construction preparation, operational procedures, data acquisition and construction summary, well control and emergency response, and QHSE control for offshore workover operations.
This document is applicable to workover operations in offshore oilfields within Chinese waters. Workover operations in beach/shallow water areas and境外 waters may refer to it for execution.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 16783.1 Petroleum and natural gas industries – Field testing of drilling fluids – Part 1: Water-based drilling fluids
GB/T 17388 Installation of electrical submersible pump units
GB 18420.1 Biological toxicity for pollutants of offshore petroleum exploration and exploitation – Part 1: Classification
GB 40554.1 Safety specification for offshore petroleum and natural gas exploitation – Part 1: General principles
SY/T 5087 Safety specifications for drilling operations in hydrogen sulfide environments
SY/T 5325 Technical specification for conventional perforating operation
SY/T 5338 Technical specification for sand control by consolidation and artificial wellbore
SY/T 5340 Method of gravel pack sand control
SY/T 5587.3 Code for conventional workover job – Part 3: Well killing, displacement and inducing flow
SY/T 5587.5 Code for conventional workover job – Part 5: Wellbore preparation for downhole operation
SY/T 5587.9 Code for conventional workover job – Part 9: Changing wellhead equipment
SY/T 5587.12 Code for conventional workover job – Part 12: Stuck freeing and fishing
SY/T 6127 Specification for data acquisition items in downhole operation for oil, gas and water wells
SY/T 6276 Petroleum and natural gas industries – Health, safety and environmental management systems
SY/T 6277 Specification for personal protection in hydrogen sulfide environment
SY 6303 Safety code for hot work (using fire) on offshore petroleum installations
SY/T 6432-2019 Specification for well control in shallow sea petroleum operation
SY/T 6610 Safety specification for downhole operation in hydrogen sulfide environment
SY/T 6690 Technical code for well control in downhole operation
SY/T 6962-2018 Configuration and installation requirements of well control system for offshore drilling unit
SY/T 7493 Specification for design and operation of fracturing in shallow sea oil well
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
beach shallow water
Sea areas with a charted water depth less than 5 m (including 5 m).
3.2
offshore
Sea areas with a charted water depth exceeding 5 m.
3.3
workover with modular drilling rig or workover rig
Workover operations carried out using a drilling/workover rig, applicable to jacket production platforms.
3.4
jack-up drilling units workover
Workover operations carried out using a jack-up drilling/workover vessel, applicable to jacket production platforms or subsea wellhead production facilities.
3.5
semisubmersible drilling units workover
Workover operations carried out using a semisubmersible drilling/workover vessel, applicable to subsea wellhead production facilities.
3.6
subsea wellhead system
A device assembly installed on the seabed mudline, used to suspend casing strings, seal the annulus between casing strings, support the subsea Christmas tree during production, and lock and support the subsea BOP stack during workover. It mainly consists of a guide base, conductor housing, high-pressure wellhead housing, casing hangers, seal assemblies, etc.
4 Design
4.1 Geological Design
Shall include geological reservoir data, target zone data, drilling and completion data, perforation data, logging data, production data of this well and offset wells and the impact of injection-production relationships, production history, pressure coefficient well history, operation objectives, geological reservoir requirements and abnormal pressure indications, and toxic/hazardous gas indications.
4.2 Engineering (Technology) Design
Engineering (technology) design shall be prepared based on the geological design, operation content, and operational procedures. The design shall clearly define the operational steps, key tools and materials, operation string and operational parameters, well control and QHSE requirements.
4.3 Operational Design
Operational design shall be prepared based on the geological design and engineering (technology) design. The operational design shall include basic data, wellhead equipment and string design, operational steps, tools and materials, schedule planning, well control design, QHSE risk analysis and measures. See Annex A for an example of the content framework for offshore workover operational design.
5 Construction Preparation
5.1 Personnel Preparation
All operating personnel shall possess corresponding operational qualifications. Special operation personnel shall hold special operation operation certificates. Relevant requirements shall comply with the provisions of GB 40554.1.
5.2 Equipment, Tools, and Material Preparation
5.2.1 For workover with a modular drilling rig or workover rig, the operational area shall be planned in advance, and workover tools, equipment, and materials shall be mobilized and shipped offshore. Layout should refer to corresponding planning diagrams. See Annex B for an example of a fixed workover rig equipment layout diagram. Equipment placement not conforming to the layout diagram should undergo load analysis.
5.2.2 For jack-up drilling/workover vessel operations, the maximum and minimum operating water depths for the rig shall be determined based on the operational sea area. Based on the berthing and positioning plan, the seabed features of the positioning area shall be investigated, and vessel positioning, ballasting, and well site coverage tests shall be completed.
5.2.3 For semisubmersible drilling/workover vessel workover operations, matching operational equipment shall be selected based on the operating water depth (see Table 1). Operational preparation shall also include the preparation of workover control systems, subsea wellhead service tools and accessories, Remotely Operated Vehicle (ROV) service tools, deepwater cleaning service tools, and landing strings.
5.2.4 Tools and materials shall be prepared according to the operational design requirements and shall comply with the provisions of SY/T 5587.5.
5.3 Workover Fluid Preparation
5.3.1 Workover fluid shall be prepared according to design requirements, and its density shall be adjustable.
5.3.2 Workover fluid shall have good compatibility with the formation and meet reservoir protection requirements.
5.3.3 The reserve volume of workover fluid shall meet operational and well control requirements. Special purpose workover fluids shall be reserved based on actual conditions.
5.3.4 Workover fluid shall meet the biological toxicity requirements specified in GB 18420.1.
5.3.5 Workover flowback fluid shall not affect the normal operation of the production system.
5.4 Equipment Inspection and Test Run
5.4.1 Workover operation tools and equipment shall meet the basic requirements for operation implementation.
5.4.2 Before operation, a comprehensive inspection and test run of operational tools and equipment, well control equipment, and auxiliary facilities should be carried out, and records shall be made. Potential hazards shall be reported promptly and rectified.
5.4.3 Equipment inspection for semisubmersible drilling/workover vessels shall include inspection of the condition of subsea equipment and its control equipment. The designed maximum anchor chain tension shall not exceed 1/3 of the anchor chain's breaking tension.
5.5 Technical Disclosure and Safety Risk Analysis
5.5.1 A technical disclosure and safety risk analysis meeting shall be held before operation.
