Intervention/Decommissioning
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1 Intervention/Decommissioning By Nicholas Samford Lloyds Register Intervention/Decommissioning SME Working together for a safer world
2 Planning Decommissioning Operations Planning Decommissioning and P&A Single well or multi-well campaigns. Batch set P&A lower abandonments? Cost analysis of riser or riser-less based lower abandonments. What is the burn rate of a riser system compared to Riserless? Does the well require a riser system? Cheaper MODU s mean a cheaper operation overall? Vessel availability and functionality. Vessel in down turn availability is high yet so is alternative equipment. Is the vessel right for the full operation or only certain parts? Platform Decommissioning Can you re-use the vessel in question? Is Toppling in place a viable option? Are there regulations against Reefing? Are the costs of recycling too high? Are there specialty tools that can cut time and costs? What method of decommissioning is best suited for your operation?
3 Decommissioning and Abandonment What exactly does Decommissioning entail?
4 NUI Turndown EOFL Divestment Partners Estimates Strategy Rig Capacity Provisions Innovation Derogation Integrity Market Reserves Production Design for Removal Temporary Power Deck Space Power Distribution Economics Re-use Safety Disposal CoP Area access Surveys SCEs Integrity Management Risk HAZID Decommissioning Subsea Utilities Facilities Telecomms Venting and Purging Program Isolations OPEX As-Building Electrical Load Commissioning U.P.S. Studies Modelling Beds Timing Area Classification Chemical Cleaning Surface Occupational Cleaning DECC Staff Retention Tax Training SIMOPS Escape Routes Approvals Standards Safety Case Flowlines Rigless Pipelines Caisson Removal Cleaning Piece Small Well P&A Removal HLVs Fluid disposal Mothballing Superlifters Flushing and Purging Separation Asbestos Disposal Pipeline Abandonment Burial Underwater Cutting Waste Segregation NORM Underwater Lifting
5 Well Abandonment R E G U L A T I O N S A P I 1 7 G A P I 1 7 G 4 30 CFR 250 S U R F A C E Platform Based S U B S E A MODU Riser Based Intervention Riserless Based Intervention
6 Surface Decommissioning and Abandonment P L A T F O R M B A S E D Rig up on platform for diagnostics and P&A operations. Pros Cheaper than running a separate rig or lift boat Better communications due to more compact work areas Less traversing from vessel to vessel Work in conjunction with production personnel for SIMOPS Cons Limited configuration of equipment Limited equipment that can be placed on work decks due to weight and size constraints More use of support vessels, which include fuel, personnel, and boat costs. Limited by crane functionality or crane load capacity, that is if the platform crane is in commission.
7 S U B S E A B A S E D Modu s Pros Plenty of deck space for all equipment Use of derrick for running riser and pulling tubing, casing, and subsea equipment Up to date cranes and space to lay out tubing and pipe Use of subsea BOP stack, marine riser, and SSTT s More room for personnel Cons EXPENSIVE!!! Long rig up times Longer well hopping times Most Modu s were made for drilling and therefore are not designed to accept decommissioning equipment Requires more 3 rd party personnel to work the bigger P&A/Intervention packages.
8 Subsea Based Riser Based Decommission/Intervention Pros Quicker time back in hole Quicker laying out tubing, pipe, and down hole equipment with the crane Full bore pressure rated riser from well to surface Can run coil tubing Subsea IWCE stack and a surface BOP, i.e. wireline, coil tubing, and snubbing BOP s Cons Longer time run system. Cumbersome to run. Testing can take longer due to riser joint make up leaks.
9 Riser-less based Pros Quicker to run Faster well hopping Lower overall day rate Less personnel and equipment needed Cons Can not run coil tubing Deck space is limited Can only perform bottom side P&A
10 Why do we have regulations? The overall objective of Regulation is to define auditable requirements that facilitate international standardization to enable safe and economic development of offshore oil and gas. It is intended for worldwide application in the petroleum industry. It is not intended to replace sound engineering judgment. It is necessary that users of local non government regulations be aware that additional or different requirements can better suit the demands of a particular service environment, the regulations of a jurisdictional authority, or other scenarios not specifically addressed. It is important that users of non governmental regulations be aware that further or differing requirements can be needed for individual applications. This standard is not intended to inhibit a manufacturer from offering, or the end user from accepting, alternative equipment, or engineering solutions for the individual application. This can be particularly applicable where there is innovative or developing technology. Where an alternative is offered, it is the responsibility of the manufacturer to identify any variations from this standard and provide details.
11 Regulations API 17G API 17G presents the requirements and gives recommendations for the performance, design, analysis, materials, fabrication, inspection, testing, welding, marking, handling, storing, shipment, and purchase, of subsea completion/workover riser equipment as one form of well intervention systems run from a mobile offshore drilling unit (MODU) or multi-purpose vessels. API 17G is intended to serve as a common reference for designers, manufacturers, and operators/users, thereby reducing the need for end user specifications. This API 17G also eliminates the need for interpretation of the applicability of requirements given by other codes and standards for permanently installed equipment.
12 API 17G4 API 17G4 is intended to supplement API Spec 17G with regard to open water riserless subsea well interventions. The document s purpose is to illustrate recommendations for the design, build, and operation of open water riserless subsea well intervention systems. Most equipment used for riserless well intervention are covered by standards widely used by the industry and as such are to be governed by those standards. If not specifically referenced in this supplement, then the expectation is that the main API 17G document prevails. Specific equipment covered by API 17G4 for Riserless subsea well intervention operations is listed as follows: Riserless Well Control Package (RWCP) Lubricator Assembly Pressure Control Head and Dynamic Seal Disconnect Systems Control Systems Injection/Circulation System Connectors
13 30 CFR 250 The Secretary of the Interior (Secretary) authorized the Bureau of Safety and Environmental Enforcement (BSEE) to regulate oil, gas, and sulphur exploration, development, and production operations on the Outer Continental Shelf (OCS). Under the Secretary's authority, the Director requires that all operations: (a) Be conducted according to the OCS Lands Act (OCSLA), the regulations in this part, BSEE orders, the lease or right-of-way, and other applicable laws, regulations, and amendments; and (b) Conform to sound conservation practice to preserve, protect, and develop mineral resources of the OCS to: (1) Make resources available to meet the Nation's energy needs; (2) Balance orderly energy resource development with protection of the human, marine, and coastal environments; (3) Ensure the public receives a fair and equitable return on the resources of the OCS; (4) Preserve and maintain free enterprise competition; and (5) Minimize or eliminate conflicts between the exploration, development, and production of oil and natural gas and the recovery of other resources.
14 Questions?
15 Thank you (US); (Brazil): E: / T: / 51 M: Lloyd s Register and variants of it are trading names of Lloyd s Register Group Limited, its subsidiaries and affiliates. Lloyd s Register do Brasil Ltda is a Brazilian limited-liability company and a member of the Lloyd s Register group Lloyd's Register do Brasil Ltda is a Brazilian limited-liability company and a subsidiary of Lloyd's Register Group Limited.
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