One of the key aspects of production optimization and monitoring towards digital transformation requirements is to have reliable and accurate data / measurement. This submission demonstrates how the smart technologies for direct wellhead measurement using Coriolis meter in gas field significantly help asset in production monitoring and Opex optimization while accurately regulating the field rates. The use of the smart technology in direct well head measurement provided real time insight into well production, with continuous and reliable quality data on production enabling Reservoir and Production Engineers to take timely decisions to optimize production, improve mass balance, better reservoir management, and reduce operating cost. The technology also had built in advanced diagnostics and connectivity features paving way for digitalization of oil fields and remote online access of data. The high operating range and flexibility in switching between wells offered ease of adaptability, reduced engineering, and commissioning costs as well as reduced maintenance and inventory requirement in mass implementation. Prior to scale-up, a trial / pilot was conducted in collaboration between ADNOC TC, Bab site Production & Instrumentation team and vendor for the technology over a period of 2 months. First, Multiple wells were selected from different operating envelop aiming different reservoirs. Then, the technology was tested by installing the Wet-Gas Coriolis meter in series with a portable well testing package provider. The measurement of the well tests from both techniques were compared. This is to evaluate the performance of the technology in having a reliable data compared with the current periodic measurement. Finally, evaluation report was produced to show the challenges, data verification and validation, then plan for wide field implementation. The technology provides real time insight and continuous monitoring of well production and its profile resulting in better production management. With direct real time well head measurement, significant CAPEX and OPEX savings can be achieved in additional to optimizing production with the use of digital transformation capable technology. Additionally, Support the asset digital and back allocation initiatives. Significant optimization on periodic portable separator well testing requirement. Permanent installation of the Wet Gas Coriolis meter on all wells will empower continuous production monitoring capabilities by increasing the availability of the real time multivariable well data. Continuous data and actionable insights will be used to identify new development opportunity to maximize recovery. Advanced diagnostics capabilities enable predictive maintenance and reducing operating costs. Improved Reservoir and well modeling and production management. No intervention cost required and enhanced HSE measures. Well behaviors change over time and can't be accurately predicted specially with the depleted wells. The current method of relying on intermittent well testing data is insufficient, expensive, labor intensive and increases safety risk. Continuous real time insight into production is essential in optimizing production, improving mass balance, better reservoir management and reducing optimizing cost. The implantation in 60 wells have a value proposition of $5.98 M over a period of 5 years.

Objectives/Scope The development of Abu Dhabi's sour gas is not without its challenges. Deep drilling in some fields presents its own set of difficulties due to high temp and pressures coupled with +30% H2S and +10% CO2. Handling of these corrosive reservoir fluids both while drilling and then testing, requires deploying advanced technology to meet the specific requirements of these reservoirs, along with the infrastructure necessary to handle the toxic and corrosive products while testing in a brown field safely. Methods, Procedures, Process Developing local sour gas production is seen as the answer to resolve the ever growing energy needs for UAE but the technical requirements for the project is stretching the limits of the industry. Results, Observations, Conclusions What did we do different: Developed and implemented specific HSE procedures and SIMOPS due to close proximity with major populated facilities which could not be shut-down during the testing period. Conducted multiple audits and drills with the local authorities including Civil Defense and local Police. Additional 3rd part supervision was provided to ensure all personal are complying with the policy and procedures developed. Installed 2 green burners and 2 vertical 90 ft flare stacks at 180 degrees. This was to cater for the changing wind directions for continuous operations and as back ups. CCTV monitoring for green burners / flare stacks was conducted although this was a rigless operation 3 circles of H2S detectors and sensors were placed around the testing area and the flare stakes and green burners to detect any H2S gas. (Covering all 360° directions). Blowdown/Depressurization valve was installed at separator, storage tanks apart from Automatic and manual shutdown system upon H2S detection Installed Optic Fiber cable from wellhead to the main control room for monitoring purposes All piping connections used were flange-to-flange as welded joints could have caused stress cracking on the weak points For Sour well operation, used fully cladded X-mass tree & Inconel well completion Considered setting of compatible TTBP (Thru Tubing Bridge Plug) for staked reservoirs zonal isolation Instead of coil tubing cement plug for accurate depth calculations. Arranged Special chemical for any scale cleanout for handling of elemental Sulphur. Arab zones were stimulated with specialized acid recipe developed exclusively for this temperature, pressure and sour conditions downhole. Bottom hole measurements were recorded successfully and all the necessary data was acquired. Novel/Additive Information This paper highlights the major challenges identified and mitigated to test and produce the highly sour HPHT gas during the appraisal program complying with ADNOC 100% HSE in a brown field without disturbing the other major operations being performed in the vicinity.

ADNOC onshore recently tested HPHT sour gas reservoirs with +30% H2S, +10% CO2 to evaluate the reservoirs and well potential as part of the efforts in supplying additional gas for meeting country's growing energy needs. Developing these massive HPHT sour gas reservoirs is essential for providing a sustainable source of energy for years to come.

Well testing operation of sour wells by flaring or flowing through existing pipe line network with limitations always consider as highly challenging in brown field. In this paper operational and social challenges considered during critical well testing operation during different phases. For initial performance evaluation, completion and surface facilities were not designed as per expected well fluids specially in consideration of H2S, CO2 and elementary Sulphur. These wells located in congested developed field and special consideration regarding social risk analysis and mitigation were considered. Extensive H2S and SO2 dispersion modeling conducted to develop EPZ & EAZ for safe operation by utilizing latest safety equipment's. Special scale treatment and down hole chemical injection adopted to cater tubing accessibility due to elementary Sulphur and other scale issues to improve flow assurance during well testing operation. Case study of condensate storge tank utilization with improved safety precaution will highlight the consideration of reservoir fluids for any well testing operation. High volatile Condensate handling at well site always be serious challenge and can be utilized with extensive HAZOP and better process safety controls. Well intervention operation with High H2S for gas wells in presence of water aggravate corrosion and H2S cracking significantly for any type of metallic material. Special down hole plugs, wire line, E-line and sealing elements of pressure control equipment's designed and utilized during intervention operation along with utilizing of special chemical. Well control is serious concern while flowing such wells due to catastrophic asset and environment impact. Special well control consideration needs to be in place for any well control scenario, this paper will cover all type of surface and subsurface consideration to improve the well & reservoir integrity.

ADNOC took up the challenge to drill, test and produce the highly sour HPHT gas reservoirs with +30% H2S and 10 % CO2 in brown field. The objective of the appraisal program was to gain valuable reservoir data by drilling and then testing the highly sour wells in order to finalize the facilities design and full field development plans. Before drilling the wells in the high sour environment, an extensive safety review of the area, emergency H2S zones, rigs technical capabilities, equipment required for safe operation, testing equipment design and its layout, crew competencies and SIMPOS protocol was prepared. The HSE requirements checklists were developed, reviewed and agreed based on the scope of work both for the drilling and testing phases in a highly congested brown field. The aim was to complete entire operation expanding over 2-3 years without jeopardizing the nearby activities and production. Due to the critically and strategically importance of the project, all the available best practices and technical competencies were applied in this project which allowed to overcome all the SAFETY challenges during drilling, tie-in and testing of these crucial wells. All objectives were successfully achieved with no HSE incidents and failures. Findings and lessons learned are being used to tailor next stage of the project to ensure most efficient scenario of Field development to support country’s increasing gas demand. All existing HSE assurance measures, procedures and programs were reviewed and implemented to suit the condition of sour wells including:Fire & Gas detection, Emergency Shutdown Systems and their layoutsEnvironmental Impact Studies focusing on the potential effects of flaring from sour wells including Zero spill and safe disposal of produced fluids into dedicated disposal wells drilledEstablishing and aligning all communications for imposition of EPZ (emergency planning Zone) and Site Specific Safety Plan with emergency response/evacuation procedures including SIMPOS with multiple evacuation route maps preparedEmergency communication protocol was developed considering the nearby population/towns in case of any gas release.Civil defense, Police and other governmental agencies were informed and ensured their participation during the large scale exercises carried out This paper provides an insight of steps taken to achieve the target of drilling/testing highly sour gas wells safely in brown field. Successful implementation and close follow up of all measures/controls identified in SIMOPS thru multiple audits; resulted in drilling, tie-in and testing of Sour gas wells with no safety incidents or injuries. All routine rig and rigless activities in the vicinity were performed safely complying fully with SIMOPS and no operation was stopped. This paper emphasis importance of following all rules and regulation set by HSE to achieve the objective safety and efficiently. A typical brown field having operational challenges while drilling and testing highly sour gas well