Day 3 Thu, March 24, 2022最新文献

{"title":"Remediation of A Complex Blockage for Gumusut-Kakap Subsea Flexible Flowline from a System Perspective","authors":"Yong Chin Gwee, Grace Chin, Chee Hou. Chan, Lee San Chua, Jason Ling, Yvonne Wu","doi":"10.4043/31422-ms","DOIUrl":"https://doi.org/10.4043/31422-ms","url":null,"abstract":"A subsea production flexible flowline in Gumusut-Kakap field was found blocked in March 2021 during a routine production well-flowline switching/alignment operation. Further evaluation showed that the blockage was caused by the formation of hydrate and gel over the 1.3km length of the flexible flowline, as the live crude and water were left stagnant and untreated in the flowline over a prolonged period. This paper covers the remediation strategy and the associated challenges from a System perspective, which successfully unblocked the flowline within a relatively short period of time.\u0000 The condition of the blockage in the flexible flowline was simulated using a commercial multiphase dynamic software to ascertain the phase distribution and hence allowed the estimation of the location and length of hydrate, gel, and emulsion in the flowline which has a downward inclination of circa 50 meters height. Heating (from production well), methanol (MeOH) soaking and flowline depressurization were planned and executed. In addition to the technical methodology, the System-wide aspects were also considered for the effective and optimum execution of the remediation activities which include attempting to fulfill the production commitment, abide by the subsea hardware and flexible flowline integrity envelope, and consider the impact of the remediation operation on other operations at the Gumusut-Kakap installation.\u0000 The MeOH soaking, flowline depressurization and pressurization successfully remediated the blockage over the period of weeks. Positive results were observed at the start of the remediation when the targeted location for MeOH contact and depressurization were identified via field trial. One of the key challenges is the time factor in which to ascertain the \"appropriate\" waiting time for the flowline depressurization, as the remediation involved partial shut-in of the prolific production wells.\u0000 A holistic System engineering approach is critical to the successful remediation of the blockage, integrating the key technical requirements as well as the soft and non-technical aspects to deliver optimum and net positive value for the asset.","PeriodicalId":11011,"journal":{"name":"Day 3 Thu, March 24, 2022","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79893578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cementing the First Australian Offshore Carbon Capture and Storage Appraisal Well","authors":"Ariel Lyons, A. Salehpour, C. Azwar, Mahdi Sheikh Veisi, Lynden Duthie, Steven Marshall","doi":"10.4043/31562-ms","DOIUrl":"https://doi.org/10.4043/31562-ms","url":null,"abstract":"\u0000 Analysis has consistently shown that carbon capture and storage (CCS) has an important role in meeting emission-reduction targets (IPCC, 2018). CCS wells require special design considerations to ensure long-term zonal isolation when exposed to carbon dioxide (CO2) because a complex set of chemical reactions leads to carbonation and dissolution of conventional cement sheaths.\u0000 Several studies conducted into the long-term stability of different cement systems when exposed to wet supercritical CO2 and CO2-saturated water showed that the novel CO2- resistant cement system provides enduring zonal isolation. Properties investigated included permeability, porosity, mass evolution, CO2 degradation front, and compressive strength. Given its superior mechanical properties, the novel CO2-resistant cement system was selected for use in the first Australian offshore CCS Gular-1 appraisal well.\u0000 To ensure that the blend characteristics of the novel CO2-resistant cement system remained optimal, a stringent quality-control procedure was developed. The blend management process, supported by rigorous laboratory testing, covered the complete lifecycle of the blend. This lifecycle extended from sourcing chemical components, to blending the components in a bulk plant, to transporting the blend across land and sea, and ultimately, preparing the slurry mixing.\u0000 By adhering to the project management process, all primary cement jobs were successfully performed without incident using conventional cementing equipment and practices. The novel approach of blending the product locally at a fit-for-purpose facility reduced costs compared with previous methods of importing a preblended product prepared at a special centralized facility. Blend homogeneity was maintained during transfer from a sea vessel to the jackup rig, with minimal change in density between samples received from the bulk plant and samples received from the rig. This blending, which verified the initial blend flow capability and the robustness tests performed at a regional laboratory using specialized equipment, concluded the blend is suitable for offshore operations.\u0000 Selection of a suitable cement system to ensure long-term zonal isolation will prove essential to the continuing expansion of the CO2 injection market. Through this offshore CCS appraisal project, valuable best practices and lessons learned in design and execution have been captured. This paper presents the decision process used for selecting a suitable CO2-resistant cement system for Australia's first offshore CCS appraisal well, drilled by AGR as part of the CarbonNet Project in late 2019, as well as the project management processes implemented to ensure successful job execution. The experiences detailed in this paper will benefit other operators confronted by challenges associated with wells subjected to CO2 injection.","PeriodicalId":11011,"journal":{"name":"Day 3 Thu, March 24, 2022","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79297548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Longest in Asia Pacific: Robust BHA Design Optimization Using Advanced FEA Modeling for Two Consecutive Hole-Opening Sections in HPHT Well","authors":"Nik Fahusnaza Nik Mohd Najmi, Alif Shamir Baharudin, Khabilashini Ravendrnathan, Vaniel Anyi, Beng Seow Chai, Jen Ming Lim, Gregg Alexander","doi":"10.4043/31433-ms","DOIUrl":"https://doi.org/10.4043/31433-ms","url":null,"abstract":"\u0000 Designing robust hole-opening BHA to drill two consecutive sections with interbedded formation in a deep HPHT appraisal well is exceptionally challenging. The two hole-opening sections, 17in × 20in and 14-3/4in × 17in need to retain strict verticality requirement and the final hole diameter sizes must be guaranteed to allow for smooth casing running operations. Conventional method, consisting of pilot hole drilling and a dedicated hole-opening run, is time consuming. Hence, the Operator decided to proceed with single run hole-opening while drilling approach for significant time saving benefit.\u0000 Utilizing finite element analysis modeling approach, tandem reamer BHA were designed and proposed for both hole-opening sections. The BHA consists of a PDC bit, a hydraulic-actuated reamer near the bit and a mechanical-actuated reamer above MWD tools. This BHA design concept can deliver both hole-opening and rat-hole cleaning operations in a single run. BHA optimization modeling was also done to select robust and appropriate cutting structures that can yield the most stable drilling dynamics with suitable drilling parameters.\u0000 Applying the FEA modeling recommendations in the 17in × 20in hole-opening section, the operation went smoothly as planned for the first 1184m until a vibration level increase was observed, believed to be due to an unexpected sudden increase in the hardness of the interbedded formation. Realizing the potential of similar risk happening for the next hole interval, a conventional two-runs approach was implemented in the 14-3/4in × 17in section. A pilot hole was first drilled with a steerable motor BHA for trajectory adjustment and then followed by a dedicated under-reaming only (URO) operation with a bullnose BHA. The 937m under-reaming interval was executed successfully without any downhole issues, despite lower ROP than initially expected.","PeriodicalId":11011,"journal":{"name":"Day 3 Thu, March 24, 2022","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78910384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbon Footprint Assessment for Decarbonisation Strategy Development","authors":"Fairul Izmal Jamal Hisne, Kayleigh Hughes, Liufang Su","doi":"10.4043/31534-ms","DOIUrl":"https://doi.org/10.4043/31534-ms","url":null,"abstract":"\u0000 As reported by the United Nations Framework Convention on Climate Change (UNFCCC), the quantity of atmospheric Greenhouse Gas (GHG) concentrations in the atmosphere has elevated by an average of 1.6% annually over the last three decades, primarily contributed by carbon dioxide gas (CO2), and is currently considered to be one of the top three issues facing the world today. Climate change, as a result of increased GHG concentrations are threatening adverse impacts to the natural environment, as well as human livelihood and survival. In response, international actions, such as the Kyoto Protocol 2005 and the Paris Agreement 2015, gathered nations worldwide to set targets with the intention of mitigating climate change and reducing its impacts. One such action is the movement towards ‘net zero’ CO2 emissions to be achieved by 2050. A commitment considered necessary by the Intergovernmental Panel on Climate Change (IPCC) for realising the goal of global temperature stabilisation to 1.5 °C above pre-industrial levels.\u0000 Increasing environmental, consumer and regulatory pressures, have driven the need for transitions in business focus towards sustainability by reducing overall GHG emission and carbon footprint. The integration of sustainability in business strategies is vital to avoid the occurrence of potential risks by demonstrating a clear link between the commitment to the sustainability agenda and continual business development. Undertaking a carbon footprint assessment of current and future assets is critical, to understand the nature of emission sources, and the contribution levels of each source to enable organizations to plan and make decisions which provide the most benefit in executing emission reduction strategies. The use of supporting tools developed in compliance with GHG Protocol principles, can provide clarity on carbon footprint drivers and enables informed, clear, traceable, carbon conscious, rapid decision making for business operations.\u0000 This paper will discuss how the application of digital tools allows for the development of baseline understanding of an organization’s carbon footprint. Further, the subsequent steps required in utilizing the baseline information to determine feasible carbon reduction strategies in a traceable, verifiable, and systematic manner, will also be explored.","PeriodicalId":11011,"journal":{"name":"Day 3 Thu, March 24, 2022","volume":"285 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76615808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cracking Mature Subsurface Information in Complex Well Design","authors":"Joely Abdul Ghafar, F. S. Jamaldin, W. Tolioe, L. Hanalim, Iliyas M Dan, Saiful Haq B. Mad Said, S. Arumugam, M. A. Omar","doi":"10.4043/31481-ms","DOIUrl":"https://doi.org/10.4043/31481-ms","url":null,"abstract":"\u0000 After 29 years of production in the brown field T at Peninsular Malaysia, most of its main producing reservoirs are already depleted. Further data acquisition is crucial to resolve reservoir characterization issues, such as communication, depletion & compartmentalization. However, matured fields often have complex trajectories and depleted zones that succumb to losses during drilling. Hence, optimized data acquisition planning is required to combat both complex reservoir characterization and well operation risk.\u0000 This paper will discuss the challenges from planning to execution of efficient data acquisition and trouble-free drilling in highly deviated well while having losses and without compromising acquired data quality. The main challenges identified are to log complex multi-stacked reservoirs in shoreface and mouth-bar environment, shifted fluid contact due to production, high inclination well trajectories, wellbore stability and logging in losses environment in depleted zones. Fluid mapping while drilling (FMWD) was brought in to assess the pressure and mobility profile of those depleted reservoirs. Additionally, fluid scanning stations were planned to confirm the fluid type and downhole reservoir sampling was planned in the virgin appraisal target. The result of data acquisition has been used for reservoir characterization in terms of pressure depletion, reservoir communication and compartmentalization.\u0000 Despite the mud losses that occurred during drilling (5-50bbl/hr.), the logging operation was a success. The acquired data has led to a new understanding of the faulting area, sand continuity and reservoirs heterogeneity. The team managed to get sample of volatile oil which is 1m below the gas oil contact (GOC) and able to quantify CO2 concentration in gas & mixture phase (Oil +OBM filtrate). The result has also proved reservoirs compartmentalization that could not be seen and the log can be biased. This information is crucial in subsurface evaluation in developing matured fields. The decision to adopt the FMWD tool has helped logging operation to continue circulating with control flowrate, avoid well in static condition during long period (>45mins) of logging operation where it reduces the risk of stuck pipe. There was no operational issue of stuck pipe or differential sticking while logging in losses condition.\u0000 Open hole data acquisition in mature field will always be relevant for reducing subsurface uncertainty. By deploying FMWD for real time data acquisition, the project team was able to save rig days by eliminating dedicated wireline trips and potential wiper trip post logging via conventional wireline. The value of the data acquired will also further reduce the project cost by optimizing the future well placement and well trajectory. The success achieved in this campaign can also be replicated into other brown field development that has the same challenges.","PeriodicalId":11011,"journal":{"name":"Day 3 Thu, March 24, 2022","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75759366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing Tubular Running Services Through Digital Solutions – Doing More with Less!","authors":"Robert L. Thibodeaux, Logan E. Smith, A. Mahmood","doi":"10.4043/31495-ms","DOIUrl":"https://doi.org/10.4043/31495-ms","url":null,"abstract":"\u0000 Digital transformation is a term that continues to be popular with the oil and gas industry. The industry's historic opposition to the adoption of innovative technology seems to be fading as operators, contractors, and service providers alike continue to invest in innovative solutions around not only digital technologies, but also in process and system optimization techniques. However, while operators are more willing to adopt newer and automated technologies, the \"proof of value\" burden still falls on service companies. Perceived value to operators may vary slightly, but overall, the industry has focused on two core tenants of value: Increased safety and efficiencyPersonnel reduction\u0000 For widespread adoption of an enhanced digital solution, the technology must not only provide quantifiable value in at least one of the core tenants, but also must repeatably demonstrate the value in the field.\u0000 The case study presented demonstrates the value added by introducing a new proprietary Programmable Logic Controller (PLC) based solution into the tubular running process. This system allows for tong operation, elevator and slip function, and single joint elevator (SJE) operation to be performed by a single person, rather than three or four personnel crew, as traditionally employed during tubular running operations. All functions are intelligently executed from a triple certified hazardous zone rated wireless tablet by a single operator's command while located inside the driller's cabin.\u0000 Through the deployment of a new consolidated and intelligent control system, the rig was able to reduce the number of personnel typically required for casing run and rack back operations down to two operators per tower, which equates to as much as a 66% reduction in personnel needed for tubular running operations. Additionally, the system allowed the operator to control the equipment from inside the driller's cabin, which improved communications and reduced red zone exposure by 30% while increasing run time efficiency by as much as 11% on some connection strings.","PeriodicalId":11011,"journal":{"name":"Day 3 Thu, March 24, 2022","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90566650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Digital Pipeline Network, Feasibility of Data Acquisition at Offshore Brownfield","authors":"Hayati Hussien, Nor Salwanie Zakaria, Ahiruddin A Rahman, Aishah Mastura Supian, Nur Asiah Maryam Abdullah, Raizil Aisyaizni Juzilman","doi":"10.4043/31627-ms","DOIUrl":"https://doi.org/10.4043/31627-ms","url":null,"abstract":"\u0000 Recently digital pipeline system has been introduced, advocating the advantages on the simplification of pipeline monitoring, elimination of inspection activities as well as the accessibility of information especially on the wellness of the pipeline(s). For successful implementation of digital pipeline system, availability of Internet of things (IoT); which is the network of physical objects \"things\" that are embedded with sensors, software, and other technologies for the purpose of connecting and exchanging data with other devices and systems over the Internet, is a must. The problems is IoT is rare or even non-existence for pipelines that have been there before 2005. Despite there are many oil and gas operators who have well advanced in control and monitoring their offshore facilities, they mostly monitor the only pressures and shutdown system. Other than that existing equipment in offshore facilities are often analogue and disconnected. A study on data retrieval feasibility to provide information to develop digital pipeline network for brown field facility arrived with very costly equipment installation. This is due the absent off communication system (DCS) and online measuring equipment (such as flow meter, pressure gauge and temperature sensor) at the required location of many offshore facility.\u0000 This paper will discuss the feasibility and urgency of implementing of Digital Pipeline Network in offshore facilities most importantly at the existing and aging facilities. It will put across the importance of data retrieval, the required additional equipment and the facility for communication system as well as the assessment of installation hurdles at the aging facilities and the consequential cost requirement.\u0000 Comprehensive data retrieval at brown field facilities can be achieved through rationalization between automated digital data online reading by installation of wireless IoT system (for equipment to measure pressure, flowrate and temperature) complimented with the existing communication system, manual data retrieval by site visit and network software analysis in order to reduce the material and installation cost while keeping the objectives intact. Pipeline OPEX will be subsequently reduced once AI based technology such as predictive and prescriptive assessment for effective pipeline monitoring and integrity management can be implemented and hence inspection and maintenance program for pipeline(s) can be optimized.","PeriodicalId":11011,"journal":{"name":"Day 3 Thu, March 24, 2022","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78237018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advance Pulsed Neutron Logging – An Optimized Solution in PMCD Well: Case Study of Oil Discovery in Indonesia","authors":"D. Kusuma, Taufik Nordin, A. Wijaya, Azlan Shah B Johari, Z. Ernando, Rosli bin Ismail, Hilman bin Roslan, Heri Tanjung, Jorge Gonzales Iglesias, Ratna Dewanda, Piko Satria Danda","doi":"10.4043/31506-ms","DOIUrl":"https://doi.org/10.4043/31506-ms","url":null,"abstract":"\u0000 ABC-1 exploration well was drilled through a carbonate build-up structure of Ngimbang Formation in offshore East Java, Indonesia. Standard triple-combo open hole logs were acquired by means of logging while drilling, while more advance wireline loggings were planned subsequently. Unfortunately, there were total losses during drilling which had to be managed by pressurized mud cap drilling (PMCD) which prevent from cuttings recovery for the rest of the interval. Multiple trips were also required to drill the well safely resulting in rugose and enlarged borehole. These conditions did not allow open-hole wireline log to access the target located at the lower interval of the well.\u0000 It was inevitable to complete the well despite not enough data had been acquired to perform a comprehensive formation evaluation. In order to obtain remaining required data, it was decided to complement the compromised open-hole data with an advance pulsed neutron log (PNL) device, which offered several unique measurements to tackle the harsh conditions. Some of these key measurements are: (1) a self-compensation algorithm which provided robust sigma (SIGM) and cased-hole porosity measurement (TPHI), which was used to further validate neutron from LWD. (2) A combination of both capture and inelastic high definition elemental spectra measurement were utilized to obtain accurate mineralogy fraction. (3) carbon-oxygen ratio (COR) high precision measurement to calculate oil saturation. Lastly (4), fast neutron capture cross-section (FNXS) measurement was also acquired to give insight on possible gas occurrence even in tight zones.\u0000 The advance PNL, acquired over 3 passes, showed consistent reading of sigma, TPHI, FNXS and elemental spectroscopy measurement. However, there were some discrepancies in between COR passes, which eventually has shed some light on what happened in this well. The first pass did not really show any potential oil along the carbonate body. Then, the second pass started to reveal potential oil around the top part of the carbonate, where resistivity is low with no distinctive neutron-density crossover. The third pass revealed an even more oil volume along the top carbonate. There is a possibility that the increase of oil reading might be due to the changing environment during logging, allowing some invasion to dissipate along the carbonate tops. This implies that there might be yet another oil zone below the revealed oil interval, should the invasion fluid start to dissipate.\u0000 Subsequent well test showed significant oil production over the interval identified from the PNL interpretation, which put ABC-1 as one of the most successful Indonesian exploration well in 2021. This case study shows the success of utilizing advance pulsed neutron log to perform comprehensive formation evaluation under challenging condition, which can be used as reference for tackling similar drilling challenges in the future.","PeriodicalId":11011,"journal":{"name":"Day 3 Thu, March 24, 2022","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82766204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decommissioning of Splitter Wellhead Wells","authors":"Siti Nadiah Ishak, Nurul Iffah M Garib, E. Damasena, D. Dahasry","doi":"10.4043/31577-ms","DOIUrl":"https://doi.org/10.4043/31577-ms","url":null,"abstract":"\u0000 Drilling keeper wells with an open-sea concept by suspending a 36″ conductor to a jackup drilling rig as a temporary structure induced several criticalities in plugging and abandoning the wells. The severity amplified with the two (2) wells are cemented inside the conductor and completed with a splitter wellhead. As per the Malaysia local regulatory, any abandoned wells are to be free from any structure protruding from seabed. This is paramount in confirming the drilled location is free from potential hazards. This splitter design confirmed that conventional cut-and-pull approach is not feasible and multistring cutter is the only solution available. This paper covers the approach and result in performing eccentric cut of fully cemented 2 × 9-5/8″, 2 × 13-3/8″ and a 1.0″ wall thickness 36″ conductor including decommission of a splitter wellhead. In achieving the objective to P&A the keeper wells, an Abrasive Water Jet Cutter (AWJC) is deployed to perform an internal eccentric cut that able to penetrate five (5) cemented casing simultaneously. The cutter is paired up with Drilling Wire Saw (DWS) and Dual Drilling Machine (DDM) as a surface cutter and a \"hole-borer\" in cutting the retrieved multistring into shorter sections that eliminated the needs to dismantle the splitter wellhead into individual component. Meanwhile, for surface lifting and suspending, an engineered pad eyes, H-beam and lifting frame with pins were required to guarantee a successful operation. AWJC is designed to penetrate structures with extreme pressure, coupled with optimized pre-planned nozzle rotation speed to establish a complete 360° clean cut downhole. The jetting mechanism using the right mixture of water and garnet is crucial in providing sufficient capability to penetrate the conductor size in an eccentric condition considering the worst-case position of the cutter downhole. The significant finding from this P&A operation is understanding the type of garnet and fluid less environment around nozzle cutter head as main contributors for an efficient cutting process. Actual pick-up weight to pull free the pipe was 37% higher than the calculated weight for a complete cut. Hence, the surface capability shall be designed with some marginal tolerance to provide additional lifting capability in case an unsmoothed cut is experienced. Overall, the operation managed to overcome the challenges and uncertainties experienced and mark as a great milestone for the first ever decommission splitter well design in Malaysia.","PeriodicalId":11011,"journal":{"name":"Day 3 Thu, March 24, 2022","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82800020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel Reservoir Sand Grain Size Map Based on Open Hole Gamma Ray Log as Im-Proved ThruTubing Sand Screen Size Selection Guideline on Tunu Multi-Layer Un-Consolidated Gas Reservoir","authors":"Rahman Setiadi, Yulianto Jong, Nur Mahfudhin, Mutawif Ilmi Muwaffaqih, Albert Richal Dading","doi":"10.4043/31573-ms","DOIUrl":"https://doi.org/10.4043/31573-ms","url":null,"abstract":"\u0000 Tunu is one of Mahakam fields with majority gas production. The depositional nature of fluvial with minimum tidal influence results in the signature of delta sedimentation by hundred layers of gas-bearing sand lenses as pay zone. They are constructed of unconsolidated clean and shaly sand reservoirs at the shallower burial and higher consolidation at deeper burial due to compaction and diagenesis. The unconsolidated section requires sand control as mandatory means to unlock it safely.\u0000 The combined challenge of numerous sand layers and marginal reserves makes it economically impossible to perform regular detailed physical sand grain assessment by individual conventional coring completed with Laser Particle Sieve Analysis (LPSA). An economic approach is through performing sand bailing. However, the bailed sand dry-sieve results were confusing with wide particle size distribution (PSD) curve variation from several well samples. Referring to this PSD uncertainty, installing straddled thru-tubing screen in front of the reservoir as sand control resulted in good production and plugged indication at the beginning of the initiative by utilizing a similar screen opening size. Thus, a new fit-for-purpose methodology was required.\u0000 A study to predict sand grain size on each reservoir target was initiated by analyzing three available shallow reservoir cores in Mahakam, which could cover most of Tunu's shallow sedimentation type. The result was that most of the sand grain size distribution on each sample core correlated with their calculated shale volume content (v-shale). Lower v-shale is respected to larger sand grain size. Unconsolidated Tunu Shallow reservoir doesn't contain any specific radioactive minerals. Thus, v-shale could be easily calculated from gamma-ray logs, which are always available on each reservoir target at any drilled wells. The relationship between sand grain size and v-shale was gathered on a single map.\u0000 The map was then validated by historical screen installation. Positive results were seen when screen size selection respects specific patterns on the generated sand map at the v-shale value of perforation intervals. Thru-tubing screen installation campaign was continued following the new sand map reference. It could deliver more than 80% successful installation with no plugging or sand at a new perforated reservoir when no screen integrity issue due to erosion was encountered.\u0000 This novel approach allowed better prediction of thru-tubing screen opening size requirements and perforation interval selection in Tunu unconsolidated reservoir and was successfully expanded in offshore Mahakam field at similar facies.","PeriodicalId":11011,"journal":{"name":"Day 3 Thu, March 24, 2022","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91484637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}