Day 1 Mon, December 03, 2018最新文献

{"title":"Malaysia's First Subsea Fields Abandonment","authors":"C. Ho","doi":"10.2118/193959-MS","DOIUrl":"https://doi.org/10.2118/193959-MS","url":null,"abstract":"\u0000 This paper covers the End-of-Field Life management and abandonment planning for four subsea fields. Scope includes end-to-end planning from confirming cessation of production with the Regulator, to Abandonment Planning, actual Implementation and Execution.\u0000 PETRONAS Procedures and Guidelines for Upstream Activities (PPGUA), Company internal guidelines and Industry Practices are available for End-of-Field Life management, Abandonment Planning and Execution. These guidelines were used pragmatically in addressing both technical and non-technical challenges on these four fields, including but not limited to PSC Obligations and Regulatory Compliance, Selection of Abandonment Concept, Execution Strategy, etc. The lack of experience in subsea field abandonment provided a unique opportunity for collaboration among industry players, constructive challenges, and the acceptability of new ideas including ways of working, processes and implementation of rules/guidelines.\u0000 There are six subsea wells in these four fields, in different water depths, some of which are in a cluster while others are not. The scope and timeline for each was evaluated on individual basis to draw alignment with its field and PSC-specific requirements; some are thereafter bundled together into a campaign to gain efficiency and savings via a broader synergy approach.\u0000 Two broad scopes were considered: Wells Plug and Abandonment (P&A), and Subsea facilities decommissioning and abandonment. All wells P&A are aligned to industry practice and PPGUA. Field in shallower water was planned for full decommissioning and abandonment with subsea tree removed and recovered; a new diverless flushing tool (developed in collaboration with subsea vendor) was used to clean the pipeline that will be left in-situ. For field in deeper water (more than 100 meters), comparative assessment was carried out and the results support \"leave in-situ\" concept. Fit-for-purpose Marine Biology assessment was carried out by a local university to support this concept. The plan is to have this abandonment concept presented to the relevant Government Agencies for final approval.","PeriodicalId":437819,"journal":{"name":"Day 1 Mon, December 03, 2018","volume":"166 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124650607","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":"Perforation Performance Simulation in Complex Multicasing Scenarios","authors":"Thomas Earl Burky, G. Craddock, J. Lavery","doi":"10.2118/193964-MS","DOIUrl":"https://doi.org/10.2118/193964-MS","url":null,"abstract":"\u0000 A common procedure within plug-and-abandonment (P&A) application is to use explosive shaped charges deployed by hollow steel carrier perforating gun systems to perforate holes into single or multiple concentric casing strings to allow a flow path for isolation fluids such as cement or resin to be pumped from surface into annular spaces to provide a permanent pressure seal to prevent the flow of fluids. When planning these selective perforating operations, there are two key performance results which are crucial to predict: (1) determine whether or not the perforation tunnel will penetrate through the wall of the outer most casing string, thereby risking a release of fluids/preventing pressure containment; (2) determine the entrance hole diameter (of each hole created around the circumference of the well) into each casing string – including through multiple concentric casing strings – to ensure that adequate flow area (and flow velocity) are present for the successful pumping of cement in a squeeze operation, or for a washing operations to prepare an annular space for a cement squeeze. With the need to consider the effects of all casing characteristics and positioning of annulus materials, the penetration estimate is far outside of the scope of published API RP-19B data. A calibrated and field-usable simulation method has been developed to help bridge the gap between known penetration data and novel scenarios.\u0000 The calculation engine is built on wellbore materials categorized into six classes; each class having three parameters for each perforator charge: maximum penetration depth, a power operator for efficiency of penetration, and a power operator for efficiency of hole size. Further, this simulation process has been able to leverage the very complex behavior of big hole (BH) charges in long gun clearances to predict limited penetration results in very challenging P&A scenarios. Together, 24 coefficient values for each perforator charge are calibrated using a database of nearly 2,000 historical perforator charge tests conducted with actual wellbore materials.\u0000 The resulting tool can predict penetration depth and hole size for scenarios ranging from one to six layers of steel of varying thickness and strength. In addition, the tool can handle fluids or concrete in annular spaces of up to several inches thick. The use of power operators for these functions enables the realistic replication of nonlinear penetration events in multiple layers, as well as hyperbolic functions for BH performance in long clearances. Although generic coefficients derived from a charge's design type were observed to produce reasonable performance estimates in these complex perforation scenarios, calibration by actual testing using varying materials helps to improve these predictions.\u0000 This paper provides details about a novel approach used to estimate perforator performance in highly complex, multicasing scenarios that are similar to those often found in P&A operations. ","PeriodicalId":437819,"journal":{"name":"Day 1 Mon, December 03, 2018","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132163796","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":"Crane-Less, Diver-Less Platform Decommissioning Vessel to Reduce Cost and Enhance Safety and Efficiency","authors":"Anuj Choudhary, Morgan Howes-Roberts","doi":"10.2118/193976-MS","DOIUrl":"https://doi.org/10.2118/193976-MS","url":null,"abstract":"\u0000 Conventional methods of offshore platform and infrastructure removal have relied heavily on floating cranes and diver intervention. This has led to high cost, significant number of support vessels in the vicinity of the operation and risks associated with manned diving.\u0000 This paper will attempt to show an alternative vision based on innovative technology to:\u0000 Enhance safety by using ROVs instead of manned diving and also to reduce the number of vessels employed in any given scenario thus reducing risks associated with SIMOPS. Improve the operational window. Crane vessels normally require good weather, low wave height and swell and low wind speed. The presented alternative has far less weather demands. Reduce time (and thus cost) on site due to the capability of the proposed design. Enhance efficiency as design is suitable for all offshore infrastructure removal including complete topsides, complete jacket or reduced number of jacket lifts, subsea pipeline, pipe and flexibles, mattresses and other subsea infrastructure within vessel lift capability.","PeriodicalId":437819,"journal":{"name":"Day 1 Mon, December 03, 2018","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116796875","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}