Well Side-Track Optimization Using Electromagnetic and Ultrasonic Measurements Across Dual Strings for Well Integrity Assurance

Most ESP systems are deployed in sub-hydrostatic wells which require artificial lift to produce the fluids. Meanwhile, some ESP are deployed to boost production in wells with sufficient reservoir pressure to flow naturally. Well JN X2 is a well in the JN Field, South Sumatera Block where an ESP was installed. Well integrity was good at the beginning of ESP installation but as the well is getting older a casing leak that resulted in fluid bypassing was found. A casing clamp was immediately installed to contain the leak fluid in order to minimize environmental and operational risks. Further investigation was carried out to find the most suitable long-term remediation method. This started with locating the leak in the production casing through CBL-VDL evaluation, Magnetic Thickness Detector (MTD) and also Acoustic Leak Flow Analyzer (ALFA)-Temp log. From all the gathered data, a well remediation was proposed to assure well integrity so that produced fluid can only reach surface through designated production string, instead of bypassing through any leak. A cementing job was firstly done to repair cement bonding above the estimated top of cement behind 5-1/2” casing at 4,005 ft MD to prevent any channeling from the formation. Unfortunately, one of the leak points was identified near the surface and cementing could not be done all the way up considering casing condition around the leak depth which has deteriorated and risk of breaking the 9-5/8” casing shoe. A solution to install new ESP string design with packer was proposed and installed to contain the fluid within production string/casing until production facility at surface. Packer integrity was tested by opening the casing valve and no more fluid observed flowing to surface.

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Well Integrity Management: A Recommendation for Indonesia's Well Life Cycle

Journal of Earth Energy Engineering ◽

10.25299/jeee.2021.5658 ◽

2021 ◽

Vol 10 (1) ◽

pp. 52-62

Author(s):

Ganesha R Darmawan

Keyword(s):

Life Cycle ◽

Oil And Gas ◽

Gas Field ◽

Well Production ◽

Well Integrity ◽

The People ◽

Oil And Gas Field ◽

Integrity Management ◽

The Government ◽

Integrity Assurance

Indonesia oil and gas field mostly are brownfields which were drilled in the late '40s up to '90s. Development and further development of a new structure throughout the years is done, including drilling exploration wells with new play and development wells. Now, most well locations become a populated village and might raise the potential risk to the people and environment. To fulfil safety commitment, well production operations have to be done safely to the people and environment. Currently, there are no specific data that has registered all the wells in Indonesia. This issue is critical for Government and the operating companies to prepare for abandonment waves to prevent methane emissions from abandoned wells. Well Integrity Management, including well registering/database, reporting, risk assessment of trouble wells, and way forward for all the wells, should be initiated by the Government to ensure integrity assurance. It aims to prevent unwanted event in the future, including when the well is permanently abandoned. This paper will present literature studies about international well integrity standards and how well integrity manages the well life cycle. This paper is also providing recommendation to implement Well Integrity Management in Indonesia to ensure end to end well register.

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Generating Value from Mature Gas Fields by Quantifying Well Integrity Assurance with a Critical Analysis of Multiple Logs & Retrieved Tubular Surface Inspection

10.2118/208204-ms ◽

2021 ◽

Cited By ~ 1

Author(s):

Christna Golaco ◽

Siddharth Jain ◽

Shams Obaid ◽

Faisal Al Nakeeb

Keyword(s):

Critical Analysis ◽

Surface Inspection ◽

Business Decisions ◽

Well Integrity ◽

Actual Observation ◽

Tubular Surface ◽

External Corrosion ◽

Integrity Assurance ◽

The Cost

Abstract Sharjah National Oil Corporation (SNOC) operates 4 onshore gas condensate reservoirs of which 3 are very mature consisting of 50+ wells producing corrosive hydrocarbons for over 30 years. The integrity of these legacy wells is frequently questioned before any development is conceptualized, thus making it critical to evaluate the well integrity. The cost associated with pulling completions for their evaluation and running logs in all wells is significant and the availability of various emerging technologies for corrosion analysis in the market makes it challenging to choose the most reliable one. This paper focuses on the detailed analysis and comparison of electromagnetic thickness logs run in 10% of the well stock from 2016 to post-workover surface inspection of the downhole recovered tubing's in 2020/21. It also quantifies how correlating different logging technologies for well integrity increases the reliability of the electromagnetic technology applied on offset wells. The paper also showcases a comparison between mechanical and electromagnetic thickness evaluation of the production casing in-situ. Data from all the available logs from past 5 years was compiled for 6 wells. On recovery of the downhole completion tubings via a hydraulic workover, an ultrasonic (UT) inspection was performed on them at surface. Both sets of results (logs and surface inspection) were analyzed on the same logging track to give a comprehensive comparison of actual observation on surface vs the measurement by in-situ logging. Another multi-barrier corrosion and caliper log were run in the production casing to analyze their outcomes alongside older results. The final step was a comparison of all available data to create a broad well integrity profile. It was observed that the remaining production tubing metal thickness detected by electromagnetic tool (logs) and surface ultrasonic measurements were in good conformance (+/-10%). In the corrosion evaluation of the production casing, the electromagnetic tool matched extremely well with the caliper log results. This shows a large reliability of this technology to quantify corrosion in offset wells. The correlation of logs with surface inspection results across wells in the same reservoir did not indicate a strong presence of external corrosion. The study enables the management to make critical business decisions on utilizing the well stock for the future. This work is the first time a comprehensive and critical analysis on the electromagnetic thickness logging technology has been done, comparing their results of remaining wall thickness to various technologies in-situ and on surface. The analysis not only compares technology from various providers, but also mechanical vs electromagnetic measurements along with their respective advantages in quantifying well integrity assurance. The paper also gives an idea on the condition of L-80 tubulars under service for 30+ years.

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