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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 41029-2021: Specification for offshore well abandonment operation of oil & gas drilling Status: Valid
Basic dataStandard ID: GB/T 41029-2021 (GB/T41029-2021)Description (Translated English): Specification for offshore well abandonment operation of oil & gas drilling Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: E13 Word Count Estimation: 9,913 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 41029-2021: Specification for offshore well abandonment operation of oil & gas drilling---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Specification for offshore well abandonment operation of oil ICS 75:020 CCSE13 National Standards of People's Republic of China Operation rules for offshore well abandonment in oil and gas drilling Published on 2021-12-31 2022-07-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration directory Preface I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 General requirements, principles and procedures for well abandonment operations 1 4:1 General Requirements 1 4:2 Operation procedure for temporary well abandonment 2 4:3 Operation Procedures for Permanent Well Abandonment 2 4:4 Other well abandonment principles and requirements5 5 Well Abandonment Information and Reports5 5:1 Preparation of well abandonment plan 5 5:2 Compilation and storage of abandonment report 5 Reference 6 forewordThis document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted: Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed and managed by the National Petroleum and Natural Gas Standardization Technical Committee (SAC/TC355): This document is drafted by: CNOOC Energy Development Co:, Ltd: Engineering Technology Branch, CNOOC (China) Co:, Ltd:, CNOOC Oil Research Institute Co:, Ltd:, China National Petroleum Corporation Offshore Engineering Co:, Ltd: The main drafters of this document: Dong Xingliang, Chen Jianbing, Sun Dongzheng, Miao Dianyuan, Wei Hongshu, Liu Zhaonian, Zhu Xinhua, Zhang Heen: Operation rules for offshore well abandonment in oil and gas drilling1 ScopeThis document specifies the requirements for well abandonment operation procedures and data management in offshore oil and gas exploration and development operations: This document applies to the internal waters, territorial sea, contiguous zone, exclusive economic zone, continental shelf of the People's Republic of China, and the People's Republic of China Oil and gas exploration and development operations in other sea areas under its jurisdiction: Operation in overseas waters can also be used for reference:2 Normative referencesThe contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document: GB/T 19139 Test method for oil well cement3 Terms and DefinitionsThe following terms and definitions apply to this document: 3:1 Submarine wellhead remnants welresiduumonseabed After the well abandonment operation, the objects left on the bottom of the seabed (the bottom of the water body in the case of internal water) and above the mud surface near the wellhead: 3:2 special well abnormalwel Oil and gas wells that meet one or more of the following conditions, depending on their final state before they are abandoned: a) Gas wells and oil wells with a gas-oil ratio exceeding 350 (m3/m3) under standard conditions; b) Wells that contain corrosive fluids such as H2S and CO2 in the formation and are prone to corrosion after abandonment; c) Wells with maximum formation pore pressure equivalent density higher than 1:30g/cm3: 4 General requirements, principles and procedures for well abandonment operations 4:1 General Requirements 4:1:1 Before the well abandonment operation, the integrity of the wellbore should be assessed, and remedial measures should be taken if the integrity requirements are not met: 4:1:2 After the well abandonment operation, the oil and gas layers and other permeable formations should be effectively isolated, so that the formation fluids between different pressure layers cannot interact with each other: For channeling, there should be at least two barriers to ensure that the formation fluid does not leak into the channel of the seabed mud surface: 4:1:3 Casings and annuluses that do not achieve effective cement isolation shall not be used as isolation barriers for permanent well abandonment: 4:1:4 The first cement plug in the perforation section, in the casing above the open hole or above the liner hanger shall be probed to the top of the cement plug and the pressure test shall be qualified: 4:1:5 The length of the last sealing cement plug for permanent well abandonment shall not be less than 50m, and the top surface of the cement plug is located 4m~30m below the seabed mud surface: 4:1:6 When the well is permanently abandoned, when the flow channel between the oil, gas and water permeable layers is blocked with cement plugs, the length of a single cement plug shall not be less than 50m; The vertical height of the cement plug above the top of the oil, gas and water permeable layer in inclined wells and horizontal wells shall not be less than 30m: 4:1:7 When the well is permanently abandoned in the waters within the territorial sea, the cutting position of all casings, piles, etc: shall be 4m deeper than the seabed mud surface: in the sea beyond the territorial sea ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 41029-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 41029-2021_English as soon as possible, and keep you informed of the progress. 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