Well integrity evaluation baker hughes, a ge company. Pennsylvania, using inspection records from the state. The objective is to place permanent well barriers which shall extend across the full cross section of the well, including all annuli and seal both vertically and horizontally. Thanks to the very low permeability of cement typically less than 0.
The well integrity operating philosophy is an important element that one should carefully consider with respect to how to manage the risk of loss of containment and overexpose oneself with additional risk by frequent well visits and interventions that brings exposure to the people and environment by doing these activities. Microsoft powerpoint well integrity spe 108698 pdf. Participants in this course will learn how to manage well design, construction, surveillance, and the documentation of well integrity for a lifeof well philosophy. Well integrity, risk assessment and cost analysis for. Well integrity life cycle mohamed hassan petroliam nasional berhad petronas 2017 8 well integrity definition well barriers page 36 of 12 7 gp 1 0 65 0 5 march 201 2 figure 11 well with vertical surface tree in operation multiple reservoir zones cap rock well integrity is a condition where subsurface fluid are contained. Well integrity life cycle management for subsea field development spe workshop life cycle well integrity management is a requirement for onshore, offshore and subsea wells that provides for the license to operate specifically in environmental critical areas. Sfcp is an easily measured but poorly documented gauge of well integrity. Ingraffea gives you permission to use these slides with the. Well integrity is based on the establishment and maintenance of confinement barriers in the particular well. Surface casing pressure as an indicator of well integrity loss and stray gas.
Repeated fracking can also cause well casing failures, creating opportunities for contamination. The rapid expansion of shale gas and shale oil exploration and exploitation using hydraulic fracturing techniques has created an energy boom in the usa but raised questions regarding the possible environmental risks, such as the potential for groundwater contamination e. Presented at the 23 rd ipec conference, new orleans, louisiana, november 810, 2016 31. Nov 16, 2016 norsok standard d010 well integrity in drilling and well operations, isodis 16530 part 1 well integrity life cycle governance and part 2 well integrity for the operational phase. We analyze 589,175 operator reports and find that lowerbound reported annual methane emissions averaged 22. The bhge channelview well integrity detection service accurately identifies cement channels and water flow inside or behind the casing by concurrently performing cement evaluation and pulsedneutron logging services in a single run. Ingraffea gives you permission to use these slides with. Well integrity, a classical topic in the oil and gas industry, is thus critical for the performance of any co 2 storage complex in terms of containment. Implementing a successful well integrity management system. Much headway has been made in the realm of well integrity, but continued research and refinement in practices will undoubtedly occur.
The second stage is monitoring the well during the life of the well locating possible leaks andor loss of metal. Historical rates of well failure in oil and gas fields vary from a few percent of wells with barrier failures to 40%. In fact there is a full spectrum of potential designs, with some companies having a single, integrated, dedicated well integrity assurance team performing all related functions, whilst in others such a single focal team is lacking entirely. Wellbore integrity assessment with casingbased advanced. Water well contamination and methane emissions, anthony describe a recent detailed study of well integrity performance in the. Athletes of integrity are the best representatives of their sport, their families and their society. The concept of well integrity in gas production activities article pdf. Engineering management and inspection schedule of petroleum well integrity musaed n. The master class combines several engineering disciplines involved in the design, construction, operation and maintenance of wells and their interaction on assuring well integrity. Our approach is based on monitoring the response of the casing when energized at the wellhead, thereby interrogating the casing without well intervention. Hetrick slide 11 of 22 intermediate casing is cemented and tested cement is the primary barrier for vertical migration of fluids the first attempt aka primary cement job. Well integrity and carbon storage california air resources board.
Epas study of the potential impacts of hydraulic fracturing on drinking water resources. Thus, a well spudded 3 y ago, which will ideally have a 3y record of inspections from which to draw observations, is more likely to have an indicator of cementcasing integrity loss noted in the inspection record than a similar well spudded only 1 y ago and associated with just onethird of the observation time. A leaking gasoil well may cause contamination of drinking water sources. Pdf the concept of well integrity in gas production. Implementing barriers ensures operations integrity during entire life cycle of well. An interview with dr anthony ingraffea, professor of engineering at cornell university. Fugitive emissions of methane from abandoned, decommissioned.
Plan should have input from well integrity personnel or well integrity personnel should be involved in the planning. Jul 12, 2016 view the workshop agenda and attendee list pdf tuesday, july 12, 2016 chairpersons welcome and objectives of the meeting introductory remarks by doe under secretary for science and energy franklin lynn orr and dotphmsa administrator marie therese dominguez session 1. Wellbore integrity of gas storage wells current perspectives. Pdf an introduction to well integrity tulio wever 1. Reported methane emissions from active oil and gas wells. This report is primarily to inform the general public about onshore well integrity and to give an informed view of current practices. The well integrity working group was led by doe s office of fossil energy, with important contributions from four doe national labs the national energy technology laboratory, lawrence berkeley national laboratory, lawrence livermore national laboratory, sandia nation al laboratories, and phmsa. Well integrity integrity assessment of oil and gas wells rams group activities what is well integrity. A leaking well, in this context, is one in which zonal isolation along the wellbore is compromised due to a structural integrity failure of one or more of the cement andor casing barriers.
Pdf the risk of environmental contamination by oil and gas wells depends strongly on the. Interface debonding as a controlling mechanism for loss of. Cement doesnt only provide a potential barrier between whats going on inside the well and the surrounding environment, but as ingraffea explained to desmog, it provides more structural integrity to help the well withstand the extreme forces of the fracking process, which can reach pressures up to 15,000 pounds per square inch. Assessment and risk analysis of casing and cement impairment in. But aspects related to production, reputation and asset value are also important. Constructing and maintaining a well is a team effort involving many people with different skills every individual is important. Plan must always be revised by key personnel plan with contingences plan for the unplanned avoid unplanned quick fix. Well design and well integrity wabamun area co s project. An introductiontowell integrity norsk olje og gass. Swiss cheese model reason 1997 common production well with two barrier envelopes source well integrity ref norsok d010.
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. Following the material selection process, it goes into well construction, complet. Tony ingraffea concludes, thorough analysis of well integrity data in modern wells with tough regulations indicates significant failure rate continues. Nopsema has developed a series of advice documents to inform and assist stakeholders to interpret and meet the requirements of the offshore petroleum and greenhouse gas storage act 2006 opggs act and part 5 of the opggs resource management and administration regulations 2011 and relevant state legislation where a state or the northern territory has conferred. Mohammad1,2 1king saud university, college of engineering, petroleum and natural gas engineering department, riyadh, saudi arabia 2king abdulaziz city for. Analysis of post 2009 shale gas wells in pennsylvania by dr. As of 2014, pennsylvania requires gas and oil well operators to report gas losses, both fugitive and process, from all active and unplugged abandoned gas and oil wells. This document is applicable to any well, or group of wells, regardless of their age, location including onshore, subsea and offshore wells or type e. Oil and gas wells are 20 typically constructed with multiple barriers to maintain well integrity and prevent leaks, thus 21 well integrity failure is a consequence of complete barrier failure king and king, 20. Ppt well integrity overview powerpoint presentation free. Analyses of 8,000 offshore wells in the gulf of mexico show that 1112% of wells developed pressure in the outer strings called sustained casing pressure, as did 3.
This report presents the findings of the doe national laboratories well integrity work group efforts in the four tasks. Primary well barrier is the first object and secondary well barrier is the second object that prevents flow from a source. Well integrity wi is one of the most important part in well planning. Well integrity management is looked at in three distinct stages, the first stage is during the well design which includes material selection, engineering design, cement design, coating and inhibitors and cathodic protection. Consistent with previous industry data, and not improving. Well integrity for natural gas storage in depleted. The priorities of the wells team are to maintain well integrity, avoid hurting anyone and deliver the well on time and in budget. With automated and integrated workflows, it delivers rapid diagnosis of well barrier elements to spot well integrity risks faster and execute timely preventive and corrective maintenance. Oilgas well integrity failures are a common but poorly constrained source of methane emissions to the atmosphere. Well integrity is a critical aspect of all production and injection activities from and is best managed using a lifecycle well integrity management program. Ingraffea found higher well failure rates in modern unconventional wells than in conventional wells. This problem with fracked oil and gas wells is occurring.
Set the scene for gas storage well integrity discussion and direction. An overall description of mechanisms by which oil and gas wells can develop gas and. Well design and well integrity the main observation from these studies is that cased wells as more prone to leakage than drilled and abandoned wells, and injection wells are more prone to leakage than producing wells. Overall responsibility for implementation of the well integrity program. It has several definitions such as norsok d0101definedwi as an application of technical, operational and organizational solution to reduce risk of uncontrolled release of formation fluids throughout the life cycle of the well. Petroleum and natural gas industries well integrity standard, iso 165301 well integrity lifecycle governance, 2015 bsee domestic and international standards workshop houston may 8 th 2015 keywords. Loss of wellbore integrity a wellunderstood and chronic problem. The integrity of oil and gas wells pubmed central pmc. Standards and guidelines for well integrity and well control. The integrity of oil and gas wells rob jacksons lab stanford. These standards have been developed using the expertise of industry, responding to previous accident and incident experience and, in general. Presentation overview of well integrity 16 nov 2016. Wellbore integrity assessment with casingbased advanced sensing. The operational phase is considered to extend from handover of the well after construction, to handover prior to abandonment.
In addition to documenting the work of the work group, this report presents high priority recommendations to improve well integrity and reduce the likelihood and consequences of subsurface natural gas leaks. Beyond the well integrity failure rate, ingraffea et al. Definition of well integrity well integrity is the design, installation, operation and maintenance of all well equipment to a standard that ensures the safe containment of produced well fluids injectants for the life of the well. Lead operator field operator wells manager wireline coord. Well integrity and longterm well performance assessment b19 open questions regarding well construction and hydraulic fracturing b26.
Originally, these efforts were aimed at deepwater drilling in the gulf of mexico, but, with time, they were disseminated throughout the oil industry, where well integrity is a must. Well integrity statistics show that oil and gas wells experience barrier. The oil and gas industry have reported severe examples of integrity loss in wells, with hugely. Performance unit leader delivery manager area manager well operations supv. By definition, a well drilled later 20092012 cant be more than 4 y old, whereas wells in the earlier interval can be as old as 12 y, having more time to develop leaks and for those leaks to be detected. An introduction to well integrity rev 0, 04 december 2012. Summary of the technical workshop on well construction. Cementcasing failure is chronic and wellknown mode of loss of wellbore integrity.
This course is an introduction to well integrity, its history, its barriers and how to apply it to wells using guidelines, standards and regulations. Well integrity basics, prevention, red flags repair options. Decisionspace well integrity management software is designed to minimize risks and production loss by streamlining well integrity monitoring and analysis. However, the structural integrity failure rate of oil and gas well barriers continues to be a subject of. For this project we are developing a suite of novel, noninvasive, casing based tools for wellbore integrity assessment, combining fastlow cost screening with higherprecision investigation. Assessment and risk analysis of casing and cement impairment. Barrier philosophy should be applied to each potential flow path and the consequences of loss of well.
Acting as a catalyzer since then, this event has demanded from all industry players a huge amount of effort to mitigate the risk of wellintegrity problems. Mohammad1,2 1king saud university, college of engineering, petroleum and natural gas engineering department, riyadh, saudi arabia 2king abdulaziz city for science and technology, riyadh, saudi arabia. It also lists new standards under development in the same categories. Jul 29, 2014 previous analyses of well integrity in the marcellus region, where ingraffea et al.
Application of well integrity methods for gas storage wells. Well integrity regulatory frameworks in the northern territory. Ensuring safe and reliable underground natural gas storage. Such loss of integrity can lead to direct emissions to the atmosphere. Norsok standard d010 well integrity in drilling and well. It is a multidisciplinary effort that has several stakeholders and phases of application.
Onshore marcellus shale, pennsylvania, usa wells drilled 20102012 4602. As per wims standards, a well is considered integral if at least two separate and sound confinement barriers across each flow path between the potential reservoir and surface are available all the time. Well barriers the primary well barrier is the first object to prevent unintentional flow from the source the secondary well barrier prevents further unintentional flow if the primary well barrier should fail ref. Engineering management and inspection schedule of petroleum. Petroleum and natural gas industries well integrity standard. Fluid migration mechanisms due to faulty well design and or. Well barrier and integrity failures can occur during drilling, production, or after. Standards and guidelines for well integrity and well control september 2018 report 485 introduction this reference list includes standards and other documents, produced both by iogp and other organisations, which address well controland well integrity. Pdf surface casing pressure as an indicator of well integrity loss. Plan the work and work the plan a plan is a live document.
Well integrity life cycle management for subsea field. Well integrity overview 1 well integrity overview 2 well integrity what does it all mean. The calculated safety margins emphasize that technical well integrity of the 12 examined boreholes is given for enhanced gas recovery injecting 100,000 t of. Report into the shale gas well life cycle and well integrity. Discussing well integrity as it relates to unconventional gas drilling, especially coal seam gas, and the. Pdf the concept of well integrity in gas production activities.
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