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    Well Integrity

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    Anubhuti Purohit Bhatnagar
    1) Well integrity refers to technical, operational, and organizational solutions to reduce the risk of uncontrolled release of formation fluids throughout a well's lifecycle. 2) A study in Norway found that 18% of production and injection wells suffered weakened integrity issues. 3) There must be at least two independent well barriers, a primary and secondary, to contain fluids and prevent unintended flow from the well during drilling and operations. Standards and guidelines provide requirements for barrier design, testing, and monitoring.

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    Well Integrity

    Uploaded by

    Anubhuti Purohit Bhatnagar
    38 views2 pages
    1) Well integrity refers to technical, operational, and organizational solutions to reduce the risk of uncontrolled release of formation fluids throughout a well's lifecycle. 2) A study in Norway found that 18% of production and injection wells suffered weakened integrity issues. 3) There must be at least two independent well barriers, a primary and secondary, to contain fluids and prevent unintended flow from the well during drilling and operations. Standards and guidelines provide requirements for barrier design, testing, and monitoring.

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    1) Well integrity refers to technical, operational, and organizational solutions to reduce the risk of uncontrolled release of formation fluids throughout a well's lifecycle. 2) A study in Norway found that 18% of production and injection wells suffered weakened integrity issues. 3) There must be at least two independent well barriers, a primary and secondary, to contain fluids and prevent unintended flow from the well during drilling and operations. Standards and guidelines provide requirements for barrier design, testing, and monitoring.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    38 views2 pages

    Well Integrity

    Uploaded by

    Anubhuti Purohit Bhatnagar
    1) Well integrity refers to technical, operational, and organizational solutions to reduce the risk of uncontrolled release of formation fluids throughout a well's lifecycle. 2) A study in Norway found that 18% of production and injection wells suffered weakened integrity issues. 3) There must be at least two independent well barriers, a primary and secondary, to contain fluids and prevent unintended flow from the well during drilling and operations. Standards and guidelines provide requirements for barrier design, testing, and monitoring.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    Well Integrity

    Integrity assessment of oil and gas wells


    RAMS Group activities

    What is well integrity?


    Well integrity means "Application of technical, operational and organizational solutions to reduce risk of uncontrolled release of formation fluids
    throughout the life cycle of a well." (NORSOK D-010)

    A study carried out by the Norwegian Petroleum Safety Authority (PSA) in 2006 revealed that 18 percent of the production and injection wells on the
    Norwegian shelf suffered from some sort of weakened integrity.

    Well barriers
    A well barrier is a pressure-containing envelope that prevents fluids and gases from flowing unintentionally from the formation into another formation
    or to the surface.

    The primary well barrier shall contain the fluids and gases at all times during the well's life cycle, and under all load conditions.

    The secondary well barrier shall contain the fluids and gases in the event of a breach of the primary well barrier. The secondary well barrier is hence a
    back-up to the primary barrier.

    Overall well barrier functions


    1. Prevent any major hydrocarbon leakage from the well to the external environment during drilling, normal production, and well operations.
    2. Prevent hydrocarbons from escaping from the well and into subterranean formations.
    3. Shut in the well on command during an emergency shutdown situation and thereby prevent hydrocarbons from flowing from the well.

    Well barrier requirements


    The following requirements may be deduced from the regulations given by the Norwegian Petroleum Safety Authority (PSA):

    1. At least two independent and tested barriers shall, as a rule, be available in order to prevent an unintentional flow from the well during drilling
    and well activities.
    2. The barriers shall be designed so as to enable rapid re-establishment of a lost barrier.
    3. In the event of a barrier failure, immediate measures shall be taken in order to maintain an adequate safety level until at least two
    independent barriers have been restored. No activities for any other purposes than re-establishing two barriers shall be carrier out in the well.
    4. The barriers shall be defined and criteria for (what is defined as a) failure shall be determined.
    5. The position/status of the barriers shall be known at all times.
    6. It shall be possible to test well barriers. Testing methods and intervals shall be determined. To the extent
    possible, the barriers shall be tested in the direction of flow.

    Authorities
    Petroleum Safety Authority (PSA) Norway
    Health and Safety Executive (HSE) Offshore Oil and Gas (UK)
    Bureau of Safety and Environmental Enforcement (BSEE) USA
    NOPSEMA, Australia

    Standards and guidelines


    NORSOK D-010: "Well integrity in drilling and well operations"
    ISO/DIS16530-1: "Petroleum and natural gas industries -- Well integrity -- Part 1: Life cycle governance manual"
    ISO/TS 16530-2: "Well integrity -- Part 2: Well integrity for the operational phase"
    API RP90: "Annular casing pressure management for offshore wells"
    NOPSEMA-GL0936: "Management of offshore well operations plans"
    NOG 117: "Recommended guidelines for well integrity"
    ISO 13533: Petroleum and natural gas industries - Drilling and production equipment - Drill-through equipment (2001/2006)
    Analytical approaches
    Barrier schematics (mainly for illustrative purposes, see NORSOK D-010)
    Barrier diagrams (can be transferred into fault trees for quantitative analysis)
    Bayesian networks (mainly for causal analysis)
    Event tree analysis (suitable for analysis of stepwise barrier activation, e.g., BOPs)
    Procedure HAZOPs (especially for work tasks in drilling and well interventions)

    Information sources
    NOG (2012): "An introduction to well integrity"
    Wellmaster Well Performance Analytics (ExproSoft)
    Corneliussen, K. (2006): "Well safety. Risk control in the operational phase of offshore wells" (PhD thesis, NTNU)
    Vignes, B. (2011): "Contribution to well integrity and increased focus on well barriers from a life cycle aspect" (PhD thesis, University of
    Stavanger)
    Holand, P. and H. Awan (2012): "Reliability of deepwater subsea BOP systems and well kicks". ExproSoft report ES 201252
    Holand, P. (1999): "Reliability of subsea BOP systems for deepwater applications - Phase II DW". SINTEF report A99426
    Holand, P. (2011): "Evaluation of the need for an acoustic backup control system for the Snorre II BOP". SINTEF report A21194
    SINTEF (2012): "Barriers to prevent and limit acute releases to sea". SINTEF report A22763.

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