About this Training Course This five-day training course will cover aspects of FPSO operations with an emphasis on management of safety. A background of the methodology used to generate the various safety plans and codes used in the operational safety case will be covered. The course will also review general operational guidelines in the offshore environment to ensure that the operations are completed as designed. This will include offtake operations and maintenance processes for the plant and vessel as well as a session on subsea. Training Objectives To enable participants to obtain an in-depth understanding of FPSO operations, safety and maintenance: Provide a broad overview of how an FPSO operation is set up and established in the field Grasp the various methods used to moor the production units Analyse information and methods required to establish the operation according to local and international regulations. Assess the methods used to calculate the safety parameters and requirements to construct an approved valid safety case Explore conditions to monitor during operations with regards to safety and structure Inspect various types of hazards associated with production and produced materials Review regular and emergency operational maintenance requirements Examine cyclones and weather events causing disconnection Comprehend manning, training requirements and operations including cargo Case studies and Exercises: The training course uses real life examples and case studies to explain the setup, preparation, implementation and operational activities required to successfully complete FPSO operations from a safety and maintenance perspective. This will allow the application of participants' newly-acquired knowledge. Case studies also stimulate independent thinking and discussion among the participants. Case Studies The case studies proposed for this course will include: A group exercise to consider what is the minimum requirement for the production of a safety case Generic plan for the development of a maintenance management system using computer software systems (e.g. Amos) Construction of a UWILD plan to include scope and potential tendering requirements Quizzes The various quizzes can be expanded or arranged to suit the group/interests and topics covered but will generally include the following topics: Mooring types and location where they are primarily used Safety cases Safety management systems Process hazards and mitigation UWILD components and regulations Operations management Offtake operations Target Audience The course is generally aimed at personnel who are involved in FPSO operations as either offshore crew or onshore support team members. This course will also greatly benefit the following groups but not limited to: Process engineers Surveyors Facility engineers Naval architects Operations engineer Health, Safety, Environment (HSE) specialists and managers Maintenance engineers Course Level Intermediate Training Methods The training course is presented in an interactive workshop format that allows for discussion. The course will be delivered through analysis of case studies and running examples of problems. Course Duration: 5 days in total (35 hours) The training instructor relies on a highly interactive training method to enhance the learning process. This method ensures that all participants gain a complete understanding of all the topics covered. The training comprises of information supplemented by visual activities including photographs from various operations and videos of operational and safety activities. Interaction verbally will be necessary to achieve the best learning outcome from the materials. Course timings and breaks 0830 - Registration 0900 - Start of training 1030 - Morning break 1045 - Training recommences 1230 - Lunch break 1330 - Training recommences 1515 - Afternoon break 1530 - Training recommences 1700 - End of training Trainer Your expert course leader has been involved in the Oil and Gas industry for over 28 years in several different roles commencing as a second deck officer on FPSO's and moving through the industry from deck officer to Master, OIM and Field Superintendent. He has also been in charge of semisubmersible and fixed production platforms as field superintendent before moving ashore into senior management roles. On completion of industry specific activities, he moved to teaching roles at South Tyneside Maritime College in the department of marine and simulation and presented live courses to maritime students from cadet to Master. Prior to returning to Perth in March 2019, he was training manager for a subsidiary of Gaz Transport and Technigaz of France. He has a Master Class 1 certificate with endorsements for hazardous cargoes and a Graduate Certificate in Business Administration as well as multiple course certificates required to operate FPSO's, platforms and semisubmersible facilities. He has been involved in the preparation of national standards for Safety Cases (Australia); Designing and structural setup of competency-based training systems in South East Asia. He was also involved in the development of minimum standards, competency profiles position based and preparation and implementation of training plans to ensure competency in the local staff in Asian operations. He was part of the development team for minimum standards of offshore safety in Australian offshore operations including the implementation of the Common Safety Training Program (CSTP). He was also involved in implementing training plans for both simulator and classroom based courses in LNG operations and cargo tank design and construction. Highlighted work experience: Premier Petroleum Myanmar Ltd Petronas Carigali Newfield Australia (Cartier) Pty Ltd: FPSO Jabiru Venture FPSO Challis Venture Onshore OIM Australian FPSO Management Pty. Ltd. POST TRAINING COACHING SUPPORT (OPTIONAL) To further optimise your learning experience from our courses, we also offer individualized 'One to One' coaching support for 2 hours post training. We can help improve your competence in your chosen area of interest, based on your learning needs and available hours. This is a great opportunity to improve your capability and confidence in a particular area of expertise. It will be delivered over a secure video conference call by one of our senior trainers. They will work with you to create a tailor-made coaching program that will help you achieve your goals faster. Request for further information post training support and fees applicable Accreditions And Affliations
Black CSCS Card NVQ Level 6 Diploma in Construction Contracting Operations Management This qualification is designed for technical learners working in a wide range of job roles, for example estimator, quantity surveyor, buyer or planner. You will have responsibility for other people in their area of occupation. You could be site-based and have responsibility for functions such as dimensional control, surveys, physical testing and work planning. You may work across one or more of the following pathways: Estimating Buying Planning Surveying General Furthermore, this NVQ provides your recognition as a Construction Site Manager and offers you a route to professional memberships such as MCIOB. Induction - As soon as you register you will be given a dedicated assessor. They will arrange an induction and together with your assessor, you will decide on the pathway which best proves your competency. The induction is used to plan out how you will gather the relevant evidence to complete the course. During the course - The assessor will work with you to build a portfolio of evidence that allows you to showcase your knowledge, skills and experience. The assessor will also regularly review and provide you with feedback. This will allow you to keep on track to progress quickly. You will be assessed through various methods such as observations, written questions, evidence generated from the workplace, professional discussion and witness testimonials. On completion - Once all feedback has been agreed, the Internal Quality Assurer will review your portfolio and in agreement with your assessor the certificate will be claimed. To download our PDF for this course then please click here.
About this Training Course Time is money in the oil business. Drilling time is big money. Whether in a technical, managerial or supporting role, you are a valuable asset to ensuring that project delivery targets are met and profits are realised. As drilling activities continue, professionals like you must grasp the language and technology of drilling operations in order to maximise expenditures throughout the producing life of a well. Drilling equipment and procedures have a unique language that must be conquered for maximum benefit. Clear and understandable explanations of drilling rig equipment, procedures, and their complex interactions provide an excellent foundation for smooth communication and increased efficiency in inter-department project team efforts. Drilling Essentials will help you de-mystify activities around the rig and well planning. It will explain the fundamentals of drilling with an emphasis on key areas such as logistical considerations, costing, and analysis of drilling contracts. Understand the urgency of drilling requests, know more about the cost implications of drilling-related problems, and understand the risks involved in a drilling contract. With the course director's drilling knowledge and skills, this is your opportunity to explore and understand important drilling concepts, principles, and technology which are presented in a reader-friendly format and illustrated with examples. As a non-drilling professional, you too can grow with the drilling industry with a deeper understanding of the critical role you play in contributing to its success! Training Objectives By attending this industry fundamentals Virtual Instructor Led Training (VILT) course, you will be better able to: Understand drilling terminology & drilling processes for completing onshore & offshore wells Appreciate major cost components of drilling operations and its impact for better project planning and management Better visualise major drilling equipment and their technical functions to promote a deeper understanding of the logistical and technical considerations Gain valuable insights on the drilling industry with a synopsis of recent technology developments that impact the drilling process Target Audience This Virtual Instructor Led Training (VILT) course has been developed for new engineers and forward-looking executives in the following fields who are interested in enhancing their knowledge and awareness of the drilling process for increased productivity & contribution to the team they're supporting: Accounting Commercial Finance & Administration General Management Logistics Procurement Tender Contract Administration E & P IT Finance Joint Ventures Materials Planning Sourcing Training Business Development Estimation & Proposal HSE Legal Planning & Budgeting Supply Chain Drilling Fluids Organisational Impact Your expert course leader has over 45 years of experience in the Oil & Gas industry. During that time, he has worked exclusively in the well engineering domain. After being employed in 1974 by Shell, one of the major oil & gas producing operators, he worked as an apprentice on drilling rigs in the Netherlands. After a year, he was sent for his first international assignment to the Sultanate of Oman where he climbed up the career ladder from Assistant Driller, to Driller, to wellsite Petroleum Engineer and eventually on-site Drilling Supervisor, actively engaged in the drilling of development and exploration wells in almost every corner of this vast desert area. At that time, drilling techniques were fairly basic and safety was just a buzz word, but such a situation propels learning and the fruits of 'doing-the-basics' are still reaped today when standing in front of a class. After some seven years in the Middle East, a series of other international assignments followed in places like the United Kingdom, Indonesia, Turkey, Denmark, China, Malaysia, and Russia. Apart from on-site drilling supervisory jobs on various types of drilling rigs (such as helicopter rigs) and working environments (such as jungle and artic), he was also assigned to research, to projects and to the company's learning centre. In research, he was responsible for promoting directional drilling and surveying and advised on the first horizontal wells being drilled, in projects, he was responsible for a high pressure drilling campaign in Nigeria while in the learning centre, he looked after the development of new engineers joining the company after graduating from university. He was also involved in international well control certification and served as chairman for a period of three years. In the last years of his active career, he worked again in China as a staff development manager, a position he nurtured because he was able to pass on his knowledge to a vast number of new employees once again. After retiring in 2015, he has delivered well engineering related courses in Australia, Indonesia, Brunei, Malaysia, China, South Korea, Thailand, India, Dubai, Qatar, Kuwait, The Netherlands, and the United States. The training he provides includes well control to obtain certification in drilling and well intervention, extended reach drilling, high pressure-high temperature drilling, stuck pipe prevention and a number of other ad-hoc courses. He thoroughly enjoys training and is keen to continue taking classes as an instructor for some time to come. POST TRAINING COACHING SUPPORT (OPTIONAL) To further optimise your learning experience from our courses, we also offer individualized 'One to One' coaching support for 2 hours post training. We can help improve your competence in your chosen area of interest, based on your learning needs and available hours. This is a great opportunity to improve your capability and confidence in a particular area of expertise. It will be delivered over a secure video conference call by one of our senior trainers. They will work with you to create a tailor-made coaching program that will help you achieve your goals faster. Request for further information post training support and fees applicable Accreditions And Affliations
About this Training Course In our pursuit to discover oil & gas in deeper horizons, wells are often drilled in a HPHT environment. To be considered a HPHT well, the downhole conditions will have pressures in excess of 10,000 psi (69 MPa) and 300° F (150° C). To drill these usually expensive wells successfully, the planning and execution phase has to be of an exceptionally high standard. Therefore, both operator and drilling/service contractor staff must be seamlessly aligned and work as a coherent team to reach and then harness the well objectives. This is particularly important when speciality services such as Managed Pressure Drilling (MPD) are being applied with crews and/or supervisors who are not intricately familiar with complicated well control incidents. As we seek to prevent costly non-productive time, attention will also be paid to enabling technologies like expandable solid tubulars, mud coolers and specialty mud. The 3 full-day course will explain the key characteristics and challenges of HPHT Planning and Well Control. This includes: Differences between HPHT and standard (conventional) wells and what this entails for well design. The challenges unique to HPHT and the impact of Pore Pressure Prediction (PPP). Static and Dynamic Equivalent Mud Density and the factors that influence the ultimate Bottom Hole Pressure (BHP). Control practices such as 'fingerprinting' to identify what's happening downhole. HPHT shut-in procedures and practices. Specific HPHT equipment and drilling tool requirements and advantages of Managed Pressure Drilling (MPD). Well control on/off bottom, bull-heading and dealing with kick-loss situations. Mud management, tolerance on mud properties and challenges in cementing. Case history on emergency control. Drills, team effort, checklists, human factor and 'getting everybody on board'. Training Objectives By the end of this course, participants will be able to: Recognize the main differences in planning/design between HPHT and standard (conventional) wells as well as the challenges that will have to be faced. Explain drilling and tripping operational challenges and practices as well as how to manage these effectively. Identify wellbore breathing (a.k.a. ballooning) and how to safely deal with this within the narrow window for mud density selection. Apply practices of consistent fingerprinting and how to develop procedures for this to benefit the rig team. Measure and understand bottom hole pressure and the effect of influencing factors such as temperature, rotation and flow rate. Understand the critical mud properties to alleviate barite sag, general mud density control techniques and specify the essentials in cementing. Manage losses and low fracture gradients with well bore strengthening methods. Execute sound HPHT shut-in procedures. Understand how MPD can assist in the safe and efficient drilling and hole cleaning of HPHT wells. Understand the use of MPD Influx Management Envelopes. Identify critical Early Kick Detection Systems (EKDS) and HPHT well control equipment. Execute safe secondary well control practices in a H2S environment, bull-heading, on and off bottom and handling of gas at surface, using MGS and hydrate mitigation measures. Target Audience The course is intended for: Office-based staff engaged in HPHT well planning and day-to-day operations Field-based rig staff working as front-line supervisors - from Assistant Drillers to Senior Toolpushers Field-based rig staff working for service companies supporting the execution of HPHT wells (MPD, mud and mudlogging services etc.) Trainer Your expert course leader has over 45 years of experience in the Oil & Gas industry. During that time, he has worked exclusively in the well engineering domain. After being employed in 1974 by Shell, one of the major oil & gas producing operators, he worked as an apprentice on drilling rigs in the Netherlands. After a year, he was sent for his first international assignment to the Sultanate of Oman where he climbed up the career ladder from Assistant Driller, to Driller, to wellsite Petroleum Engineer and eventually on-site Drilling Supervisor, actively engaged in the drilling of development and exploration wells in almost every corner of this vast desert area. At that time, drilling techniques were fairly basic and safety was just a buzz word, but such a situation propels learning and the fruits of 'doing-the-basics' are still reaped today when standing in front of a class. After some seven years in the Middle East, a series of other international assignments followed in places like the United Kingdom, Indonesia, Turkey, Denmark, China, Malaysia, and Russia. Apart from on-site drilling supervisory jobs on various types of drilling rigs (such as helicopter rigs) and working environments (such as jungle and artic), he was also assigned to research, to projects and to the company's learning centre. In research, he was responsible for promoting directional drilling and surveying and advised on the first horizontal wells being drilled, in projects, he was responsible for a high pressure drilling campaign in Nigeria while in the learning centre, he looked after the development of new engineers joining the company after graduating from university. He was also involved in international well control certification and served as chairman for a period of three years. In the last years of his active career, he worked again in China as a staff development manager, a position he nurtured because he was able to pass on his knowledge to a vast number of new employees once again. After retiring in 2015, he has delivered well engineering related courses in Australia, Indonesia, Brunei, Malaysia, China, South Korea, Thailand, India, Dubai, Qatar, Kuwait, The Netherlands, and the United States. The training he provides includes well control to obtain certification in drilling and well intervention, extended reach drilling, high pressure-high temperature drilling, stuck pipe prevention and a number of other ad-hoc courses. He thoroughly enjoys training and is keen to continue taking classes as an instructor for some time to come. POST TRAINING COACHING SUPPORT (OPTIONAL) To further optimise your learning experience from our courses, we also offer individualized 'One to One' coaching support for 2 hours post training. We can help improve your competence in your chosen area of interest, based on your learning needs and available hours. This is a great opportunity to improve your capability and confidence in a particular area of expertise. It will be delivered over a secure video conference call by one of our senior trainers. They will work with you to create a tailor-made coaching program that will help you achieve your goals faster. Request for further information post training support and fees applicable Accreditions And Affliations
The main subject areas of the course are: Controlling the health risks of asbestos. Sample handling and waste disposal. Identification of asbestos by PLM. Gravimetric quantification of asbestos-containing materials. Discrimination and quantification of free fibres by dispersion and PCM. Analysis of soils - practical application.
Gold CSCS Card NVQ Level 3 Diploma in Construction Contracting Operations This qualification is designed for those in a technical job role, This qualification is appropriate for employees in the construction and built environment sector working at a technical level in disciplines such as estimating, buying, planning, surveying, site technical support and design co-ordination. You could be site-based and have responsibility for functions such as dimensional control, surveys, physical testing, and work planning. You may work across one or more of the following pathways: Estimating Buying Planning Surveying Site Technical Support Design Co-Ordinator General Induction - As soon as you register you will be given a dedicated assessor. They will arrange an induction and together with your assessor, you will get to decide on the pathway which best proves your competency. The induction is used to plan out how you will gather the relevant evidence to complete the course. During the course - The assessor will work with you to build a portfolio of evidence that allows you to showcase your knowledge, skills and experience. The assessor will also regularly review and provide you with feedback. This will allow you to keep on track to progress quickly. You will be assessed through various methods such as observations, written questions, evidence generated from the workplace, professional discussion and witness testimonials. On completion - Once all feedback has been agreed, the Internal Quality Assurer will review your portfolio and in agreement with your assessor the certificate will be applied for. To download our PDF for this course then please click here.
About this Training Course The drill string is the simplest piece of equipment in use on a drilling rig and at the same time, the most critical piece. We use the qualifier 'basic' because although 99% of the drill string comprises plain tubes that are just screwed together, the lowest section, just above the bit, can go to extreme loading and is fitted with highly sophisticated electronics packages providing both positional and lithological data as well as a steering system to drive and orient the bit. The principle tasks of the drill string are also deceptively simple. These are to: Convey each drill bit to the bottom of the hole and then to retrieve it when worn, Act as a conduit to convey drilling fluid at high pressure down to the bit and Transmit torque from surface to bit, occasionally in concert with a hydraulic motor to drive this bit. This 3 full-day course will cover in detail what it takes to decide on minimum drill string specifications, which are able to support the loads to which it will be subjected. In addition to the need to use a drill string with minimum strength requirements, we also need to ensure that we can prevent drill string failure. If the failure consists of a small split or leak of any kind, then the time involved may be little more than that required for a roundtrip to change the bit. If the string parts, then the recovery is likely to take a considerable amount of time. In a worst case scenario, the fish in the hole may prove impossible to retrieve, requiring a sidetrack. A less than optimal design of the string will reduce the efficiency of the operation and almost always leads to premature bit wear. This is particularly true when we are unable to measure and control the dynamics of the drill string as a whole and the bottomhole assembly in particular. Axial vibrations, torsional vibrations and lateral vibrations may take place in various degrees of severity. The behaviour of the drill string while operating under torsional vibrations is thought to be of great importance and may result in torsional buckling. This course will also cover the drilling optimization limiters, how to identify them and how to remove them. This is done by understanding the drill string dynamics - by operating under the most favourable conditions and by measuring the dynamics in the vicinity of the bit (or at the bit) in order to make timely adjustments. Training Objectives The course homes in what office staff needs to know and plan for and what field staff needs to know and implement. By the end of this course, participants will be familiar with: Critical dimensions of common drill pipe and weld-on tool joints and its relation to yield for calculation of tensile, torsional and burst resistance. Make-up torque of connections that relate to the tool joint dimensions and the torsional strength of that connection. Use of design factors and safety factors on tensile and torsional strength in relation to new and worn state. Conditions which could lead to drill pipe collapse. Situations where limitations on sinusoidal (snake) and helical buckling will apply and the influence of radial clearance and deviation. Failure of drill pipe (fatigue) and the circumstances under which these would occur (rotation across doglegs, pipe in compression etc). Mechanism under which hardbanding would induce casing wear and the methods applied to measure and prevent any significant wear. Drill pipe inspection methods we apply to identify early flaws/cracks/corrosion, to measure dimensions, to inspect tool joints etc. Common BHA components, including heavy wall drill pipe, their external/internal dimensions, connections (API, proprietary) and appearance (such as spiral). Significance of thread compounds to ensure the correct make-up torque is applied. Significance of drill string/BHA 'neutral point' in the context of drill string component failure. Basic design principles for a BHA make-up in a vertical, low/medium deviated and highly deviated well in terms of weight transfer and drag/torque. Stabilization principles for a pendulum (vertical), a stabilized (vertical or tangent), a build and a drop-off assembly. BHA design and stabilization in relation to mitigation/elimination of vibration and to the elimination of tension, torsion or fatigue failure. Matching bit aggressiveness, gauge length, BHA stabilization, steerability and Mechanical Specific Energy (MSE) to mitigate the severity of any vibration. Bit efficiency and reduction of wear by understanding mechanical and hydraulic limiters. How to perform a passive or active drill-off test. Importance of being conversant with API 7G RP and/or equivalent data books, to look up/check the recommended tensile/torque and other parameters for the drill string in use. Target Audience This course is intended for staff directly or indirectly involved in the delivery of challenging wells such as junior to senior well engineers, both in office-based planning and operations and field-based operator/contractor supervisory staff such as company men and toolpushers. Trainer Your expert course leader has over 45 years of experience in the Oil & Gas industry. During that time, he has worked exclusively in the well engineering domain. After being employed in 1974 by Shell, one of the major oil & gas producing operators, he worked as an apprentice on drilling rigs in the Netherlands. After a year, he was sent for his first international assignment to the Sultanate of Oman where he climbed up the career ladder from Assistant Driller, to Driller, to wellsite Petroleum Engineer and eventually on-site Drilling Supervisor, actively engaged in the drilling of development and exploration wells in almost every corner of this vast desert area. At that time, drilling techniques were fairly basic and safety was just a buzz word, but such a situation propels learning and the fruits of 'doing-the-basics' are still reaped today when standing in front of a class. After some seven years in the Middle East, a series of other international assignments followed in places like the United Kingdom, Indonesia, Turkey, Denmark, China, Malaysia, and Russia. Apart from on-site drilling supervisory jobs on various types of drilling rigs (such as helicopter rigs) and working environments (such as jungle and artic), he was also assigned to research, to projects and to the company's learning centre. In research, he was responsible for promoting directional drilling and surveying and advised on the first horizontal wells being drilled, in projects, he was responsible for a high pressure drilling campaign in Nigeria while in the learning centre, he looked after the development of new engineers joining the company after graduating from university. He was also involved in international well control certification and served as chairman for a period of three years. In the last years of his active career, he worked again in China as a staff development manager, a position he nurtured because he was able to pass on his knowledge to a vast number of new employees once again. After retiring in 2015, he has delivered well engineering related courses in Australia, Indonesia, Brunei, Malaysia, China, South Korea, Thailand, India, Dubai, Qatar, Kuwait, The Netherlands, and the United States. The training he provides includes well control to obtain certification in drilling and well intervention, extended reach drilling, high pressure-high temperature drilling, stuck pipe prevention and a number of other ad-hoc courses. He thoroughly enjoys training and is keen to continue taking classes as an instructor for some time to come. POST TRAINING COACHING SUPPORT (OPTIONAL) To further optimise your learning experience from our courses, we also offer individualized 'One to One' coaching support for 2 hours post training. We can help improve your competence in your chosen area of interest, based on your learning needs and available hours. This is a great opportunity to improve your capability and confidence in a particular area of expertise. It will be delivered over a secure video conference call by one of our senior trainers. They will work with you to create a tailor-made coaching program that will help you achieve your goals faster. Request for further information post training support and fees applicable Accreditions And Affliations
P404 Air Sampling of Asbestos and MMMF and Requirements for a Certificate of Reoccupation Following Clearance of Asbestos is the industry standard qualification for those whose work involves air sampling and clearance testing, such as asbestos analysts. In addition to holding the qualification, they are required to undertake and provide evidence of annual refresher training. RP404 Refresher is a new course, specifically designed to meet this requirement. RP404 Refresher enables candidates to revise and update their knowledge on air sampling and clearance testing techniques, and to receive a certificate of course completion by passing a written examination, which covers both the theory and practice of air sampling and clearance testing.
Level 6 NVQ Diploma in Construction Contracting Operations Management
WiFi demystified training course description A concise overview aimed at less technical staff requiring an overview of WiFi networks. The course covers the technologies at a high level allowing delegates to discuss WiFi networks with others recognising the buzzwords used. The course will also allow the delegates to recognise the issues involved in planning and installing WiFi networks as well as securing them. What will you learn Recognise the different WiFi technologies available. Describe the architecture of WiFi networks including the role of Access Points. Recognise the distance limitations of WiFi networks. Describe the buzzwords used in WiFi. Recognise the security issues of WiFi networks. WiFi demystified training course details Who will benefit: Anyone working with WiFi networks. Prerequisites: None. Duration 1 day WiFi demystified training course contents Introduction When to use wireless, when to use wired, WiFi technologies: 802.11, 802.11a, 802.11b, 802.11g, 802.11n, WiFi speeds and distances, comparison to other wireless technologies, 802.15 (Bluetooth), 802.16 (WiMax). Simple WiFi networks Network cards, Antennae, Access Points, WiFi routers. Enterprise WiFi networks SSIDs, Multiple WiFi networks, Repeaters, Wireless bridges, Controller based access points, Wireless switches, Power Over Ethernet. RF site surveys Steps and techniques, tools, analysing the feasibility of WiFi, range, performance, roaming. Security How safe are WiFi networks? Encryption, Authentication, WEP WPA WPA2. 802.1x, EAP, RADIUS.