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The word "integrity", is defined as: "the state of being whole, complete and entire, in an undiminished or unbroken condition". Well Integrity Remediation, therefore, is maintenance of well quality to insure such totality and undiminished condition.Well integrity has received a significant attention these days, from well conception to well abandonment. The driving factors such as the high oil price along with new techniques for Enhanced Oil Recovery (EOR) make it feasible and profitable to prolong the field life beyond original design. However, an extended well life has led to a higher probability of well integrity related problems e.g. Fatigue, Erosion and Corrosion.As case in point, PTTEP S1 -Sirikit Oilfield, experiences unavoidable well integrity problems, primarily relating to corroded casing due to water encroachment. In this respect, it is the sub-surface challenge to minimize the shut-in time and prolong overall well life. To address these problems, swelling elastomer was considered for a remediation work by isolating leak casing from production system, and thereby preventing further well integrity failure. Properties of inherent elastomeric substances is designed such that, when in contact with the wellbore fluid, will react and swell against the contacted surface providing long-term isolation with no mechanical intervention. The known product e.g. Swellable Packer has been proven for many years mainly for open-hole applications, until such a time as cased-hole remediation techniques are implemented by PTTEP.This paper examines case histories and demonstrates the practicality of Swellable Packer in the cased hole application which aging casings wall were chronically corroded by water encroachment. Two different types of wells: producer and injector, which casing confirmed failure by Production Logging tool (PLT) and Ultra Sonic Imager tool (USIT), were selected as candidates. The background, operation sequence and performance evaluation methodology are detailed on the following sections in this paper.

The Company's digital transformation project was started in 2018 to overcome the challenge from digital disruption, energy transition and hydrocarbon reserves declination. Drilling and well engineering cluster is a key player in operating cost optimization which requires digestion and analysis of tons of data generated through daily operational reports. Thus, several digitalization projects have been initiated to optimize drilling and well process to be better, faster, and safer. In this paper, we intend to share a successful journey of digitalization under drilling and well cluster. The transformation journey started with identifying engineer's pain points in each process, among which the most common were redundant processes, manual data inputs/calculations, and time spent on collecting and analyzing unstructured data sources. Moreover, diversified practices on engineering programs and data analysis adversely affect well design standardization and optimizations. To counter those pain points, digital transformation projects were ideated by using digital solutions and technology which are grouped in 5 focus areas: centralized data platform, business intelligence, robotic process automation, digital assistant, and data analytics from fundamental to advance level respectively. Besides out-of-the-box solutions, many internally developed systems have been utilized throughout the journey which helps engineers to build their digital capability and awareness. There are over twenty (20) drilling and well digital projects implemented since the transformation project has been started. And as a result, engineers’ workload has been reduced significantly using digital solutions such as data extraction, visualization, and in-depth analysis. For example, the first successful project under robotic process automation utilizes text analytic and Artificial Intelligence (AI) techniques to analyze well conditions and integrity status from unstructured data and to generate reports within a limited timeframe. Another successful case is well design automated workflow which saved around 40% planning cycle time and provides a better design quality which will lead to a lower well cost. Total cost saving of over 40 mmusd has been recorded so far under the digital transformation project. Furthermore, there is an outlook for additional cost-saving through future new projects, integration, and scaling up plans across the company's international assets. The results and outcomes are very promising to this point. We believe that these initiatives will help the company to improve productivity, benefits, agility, and move beyond business disruptions. Combination of drilling and well expertise with digital transformation solutions will significantly improve well design process, quality and operational efficiency which make industry stay competitive and resilient in the future.

Drilling engineers use several applications to perform well design tasks and to create a final report for review and approval, any changes in subsurface information require revalidation of engineering calculations and repeat of the entire tasks to update the stage-gate report. This is usually a manual, timeconsuming and human error prone process that may result in additional cost and/or prolonged planning cycle time. Moreover, such manual works by individual engineers lead to diversified well design practices and formats across a company which make it difficult for standardization and compliance control. Drilling engineering computer programs are primarily standalone applications that are used for engineering calculations with no continuous workflow in most cases. Well Delivery Process (WDP) is an engineering software solution developed to integrate, automate and standardize well construction planning process across the operating company. The system encompasses several integrated workflows by which users can carry out drilling/completion tasks from feasibility study to concept selection and detailed design as well as operations monitoring and closeout reports on a single digital platform. Furthermore, functions such as engineering calculations, rules validation, offset analyzing, well schematic, risk analysis, checklist, and well program are automated through the workflows and several microservices built on a series of applications. The WDP, based on the company's well design automation initiative, was developed jointly with the service provider using its Business Process Management (BPM) tools. The system integration transforms how wells are constructed and delivered by combining a digitalized planning and design process with engineering models on a single and open cloud-native platform. Several tools and techniques such as design templates, continuous calculations, well cost models, etc. are utilized through integrated workflows to automate well design and process. The solution supports all new wells and leverage data from existing wells to optimize well construction process. As a result, the collaborative well design platform and automation tools take the drilling engineering process to the next level with a better quality well design and a reduced planning time.

As a part of the company's digitalization project, the Well Delivery Process (WDP) software solution was successfully developed and launched in early 2021. By using this solution, engineers benefit from the project objectives like process standardization, well design quality, and well planning cycle time reduction. The WDP software consists of a series of integrated well delivery workflows including well design, drilling execution monitoring, and closeout reports within a single cloud-based platform. The system also provides users with many automation features such as well design rules validation, offset well analysis, risk analysis, automated calculations, and digital reports (drilling programs). Through this paper, we share our experiences and observations on the system development and implementation, and also challenges and limitations that we faced to roll it out successfully. In our conventional practices before the digital transformation, drilling engineers had their individual practices/formats to perform the well delivery process using various applications and techniques. Computer applications were used to generate and compile a drilling program, but there was no standard way of performing this process. In situations where the design parameters and/or subsurface information change, engineers should have repeated the entire process to revise the design and/or the drilling program manually. To standardize the process, minimize repetitive tasks, and provide engineers with all required digital tools, the first solution (a prototype computer program) was developed in-house to prove the concept. After multiple peer reviews and trials, we used the prototype program to specify user requirements for generating the WDP software solution. An agile methodology was utilized to engage all drilling engineers in each sprint of the WDP development phase to ensure that their requirements are fulfilled. Upon completion of the development phase, a comprehensive User Acceptance Test (UAT) was conducted followed by training sessions before the cut-off date for switching from the manual process to the WDP digital workflow. Switching from existing practice to a new way of work is always challenging especially when it comes to introducing new software. There was some resistance at the start-up period due to users' unfamiliarity with the software and also software bugs that were not found during testing periods and UAT. A support team was set up to ensure immediate action on users' requirements and any technical issues with the software. During the challenging transition period, all users were fully supported until make sure they are enough familiar with the system to complete the task effectively. The support team deployed hotfixes (bug fixing) as quickly as possible with no major impact on the drilling programs' timeline, monitored the system performance on daily basis, and gathered feedback for further improvements. At present, the WDP is the primary system used by all drilling engineers in the company's domestic assets as an integrated end-to-end well delivery workflow that provides an improved design quality in a shorter planning time. More than 200 well design workflows have been initiated and approved through the system since it is being used. Based on the recent users' satisfaction survey and feedback, an overall rating of 4.2 from 5 shows the WDP solution's effectiveness with many popular and useful features especially offset well analyzer and well design dashboards. As one of the first end-to-end workflow generations in the drilling engineering process, the WDP could save the working time up to 35-40% (voted by users) through a centralized dataset platform and its holistic approach to process standardization/automation. Besides design quality and cycle time improvement, the system also enables advanced data analytics for further automation and enhancements.