SY/T 7824-2024 Design method of zonal water injection in offshore oil field English, Anglais, Englisch, Inglés, えいご
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ICS
E
Professional standard of the People's Republic of China
SY/T 7824-2024
Design method of zonal water injection in offshore oil field
海上油田分层注水工艺设计方法
(English Translation)
Issue date: 2024-12-25 Implementation date: 2025-06-25
Issued by National Development and Reform Commission, P.R.C
Contents
1 General provisions
2 Terms
3 Basic requirement
4 Acceptance and storage of materials
4.1 Steel pipesand fittings
4.2 Coating materials
5 Division of project units
6 External coating
6.1 General requirements
6.2 Fusion bonded epoxy powder coating
6.3 Coal tar epoxy coating
6.4 Liquid epoxy coating
6.5 Solvent free polyurethane coating
6.6 Polyethylene coating
6.7 Polypropylene coating
6.8 Polyolefin tape coating
6.9 UV resistant three-layer fusion bonded powder coating
6.10 Coating for above-ground pipeline
6.11 Glass fiber reinforced epoxy armoring coating for crossing pipeline
7 Internal coatings
7.1 General requirements
7.2 Cement mortar lining
7.3 Fusion bonded epoxy powder coating
7.4 Liquid epoxy coating
8 External coatings for steel pipes in station
8.1 General requirements
8.2 Coating for above-ground pipes
8.3 Multi-layer coating for buried pipes
9 External joint coating and repair
9.1 General requirements
9.2 Joint coating of heat-shrinkable sleeve
9.3 Liquid joint coatings
9.4 Polymer tape joint coatings
9.5 Viscoelastic joint coatings
9.6 Epoxy powder joint coatings
9.7 Repair of coatings
10 Internal joint coating
10.1 General requirements
10.2 Cement mortar joint coatings
10.3 epoxy joint coatings
10.4 Prefabricated inner coating of corrosion resistant alloy
11 Handover and acceptance
Appendix A Inspection batch quality acceptance record
Appendix B Quality control data verification record
Appendix C Apparatus used for testing the quality of projects
Explanation of wording in this code
List of quoted standards
Addition: Explanation of provisions
Design Method for Layered Water Injection Process in Offshore Oilfields
1 Scope
This document specifies the requirements for injection water source selection and water quality, wellhead pressure design, process selection and string design, implementation, and adjustment for layered water injection in offshore oilfields.
This document applies to the design and implementation of layered water injection in offshore oilfields.
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 22513 Petroleum and natural gas drilling and production equipment — Wellhead and christmas tree equipment
SY/T 0600 Prediction method for scaling tendency in oilfield water
SY/T 5329 Technical requirements and analysis methods for water quality of water injection in clastic oil reservoirs
SY/T 5358 Evaluation method for reservoir sensitivity flow experiments
SY/T 5587.5 Code for conventional workover operation — Part 5: Preparation of wellbore for downhole operation
SY/T 5623 Prediction (monitoring) method of formation pressure
SY/T 5733 Completion operation for water injection well and weekly allocation method for layered water injection testing
SY/T 6949 Casing and tubing with premium connection
SY/T 7622 Technical specification for cable-controlled layered water injection
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
electronically controlled intelligent zonal water injection string
A water injection string composed of tools such as intelligent water distributors and zonal isolation tools, capable of online monitoring and flow regulation of parameters such as flow rate, choke opening, pressure, and temperature for each water injection layer using electrical signals, pressure signals, etc.
Note: Includes pre-wired cable intelligent zonal water injection strings and cableless intelligent zonal water injection strings.
3.2
hydraulic control zonal water injection string
A water injection string composed of tools such as hydraulically controlled valves and zonal isolation tools, capable of regulating the flow rate for each water injection layer using hydraulic control lines.
3.3
electrically measure and adjust zonal water injection string
A water injection string composed of tools such as measure-and-adjust water distributors and zonal isolation tools, capable of zonal isolation testing, flow testing, and adjustment using cable operations carrying measurement and adjustment tools and isolation testing tools.
Note: Includes concentric and eccentric electrically measure-and-adjust zonal water injection strings.
3.4
mechanical zonal water injection string
A water injection string composed of tools such as water distributors and zonal isolation tools, capable of zonal isolation testing, flow testing, and adjustment using wireline operations.
Note: Includes hollow integrated, concentric integrated, and single-stage concentric zonal water injection strings.
3.5
parallel dual-tubing zonal water injection string
A water injection string composed of two sets of tubing, flow distribution devices, zonal isolation tools, etc., forming two injection channels from the dual tubing,配套 with a dual-tubing Christmas tree, enabling independent control of the injection volume for each layer through surface regulating valves.
3.6
intelligent water distributor
A tool composed of adjustable chokes, flow testing components, pressure and temperature testing components, etc., capable of real-time downhole water injection parameter testing and online choke opening control.
4 Basic Data
4.1 Geological and Reservoir Data
Well location data, reservoir physical property data, reservoir lithology data, reservoir fluid data, perforation data, water injection zones, required injection volume and injectivity, static formation pressure, formation temperature.
4.2 Drilling and Completion Data
Well trajectory data, wellbore configuration, completion method and completion string, formation integrity test data, and fracture pressure data.
4.3 Production Well History
Commissioning date, conversion to injection date, current production string, injection profile test data, zonal allocation test data, mini-frac test data, production milestones, current injection status, and existing problems.
4.4 Platform Water Injection Equipment and Facility Conditions
Maximum output pressure and displacement of the water injection pump, pressure and temperature ratings of the water injection pipeline, etc.
5 Design Principles and Considerations
5.1 Design Principles
Offshore layered water injection shall be designed following the principles of safety and reliability, technological maturity, and economic effectiveness, mainly including:
a) Meeting reservoir injection allocation requirements and zonal qualification rates;
b) Injecting without exceeding fracture pressure, installing downhole safety valves;
c) Ensuring the main layered water injection process technology and key tools are mature and reliable;
d) Ensuring economic rationality throughout the entire life cycle of the water injection well's zonal injection operation and subsequent adjustment.
5.2 Factors to Consider in Design
The design of offshore layered water injection processes shall consider the following factors:
a)Offshore oilfields have a limited number of development wells, with high single-well water injection volume;
