Tesco (United Kingdom)

We present the Tesco Grocery 1.0 dataset: a record of 420 M food items purchased by 1.6 M fidelity card owners who shopped at the 411 Tesco stores in Greater London over the course of the entire year of 2015, aggregated at the level of census areas to preserve anonymity. For each area, we report the number of transactions and nutritional properties of the typical food item bought including the average caloric intake and the composition of nutrients. The set of global trade international numbers (barcodes) for each food type is also included. To establish data validity we: i) compare food purchase volumes to population from census to assess representativeness, and ii) match nutrient and energy intake to official statistics of food-related illnesses to appraise the extent to which the dataset is ecologically valid. Given its unprecedented scale and geographic granularity, the data can be used to link food purchases to a number of geographically-salient indicators, which enables studies on health outcomes, cultural aspects, and economic factors.

Future generations of civil aircrafts and unconventional unmanned configurations demand for innovative structural concepts to improve the structural performance, and thus reduce the structural weight, but also to allow possible material couplings to be made. Static and dynamic aeroelastic stability can be altered by these couplings. It is therefore necessary to use an accurate and computationally efficient beam model during the preliminary design phase. A stiffened box, made of isotropic material, but with the stiffeners oriented so that they originate the expected bending/torsion coupling, is considered in the present work. The overall equivalent bending, torsional and coupled stiffness is derived by means of homogenization of the shell skin and of the stiffener plate stiffness. A new equivalent homogeneous orthotropic material is determined and introduced into the equivalent plate configuration. The accuracy of the simplified beam model is demonstrated by the application of structural topology optimization technique by means of Altair Optistruct. Good agreement has been found between the theoretical simplified beam model and numerical analysis.

Abstract Casing-while-drilling is a relatively new well construction process or technology for simultaneously drilling and casing a wellbore, and has been utilized globally over the last 15 years or so. This technology has shown advantages of reducing overall drilling time and cost. It has demonstrated signs of reducing hole problems, such as mud losses, through plastering effect because of the rotation of the casing string against the formation. It provides assurance to case off unstable formations while drilling, resulting in significantly reduced well construction costs. Saudi Aramco has made several field test runs of this technology beginning in early October 2008, including deployments of both simple casing drilling with drill-through casing bit (non-retrievable) system and advanced bottom hole assembly (BHA) retrievable system designed for directional casing drilling. This paper will document the lessons learned from implementation of the technology, including planning and design, rig operations, problems encountered, modifications made to reduce risk after extensive review and investigation, and finally, successful deployment of a directional casing drilling to the planned casing point with a 17" x 13-⅜" system. In addition, the paper briefly outlines the further required improvements of casing drilling tools to ensure continued success in the future.

Abstract HPHT wells present many economic, technical, operational and HSE challenges. Casing Drilling is introduced as a potential alternative method for drilling HPHT wells. The benefits and limitations of Casing Drilling are investigated in this study in correlation with the current HPHT challenges.The operational mud weight window can be widened beyond the traditional trip margin through the well-known Plastering/Smear Effect of Casing Drilling. Moreover, many mud challenges in HPHT wells can be eliminated including static and dynamic barite sag, drilling mud deterioration under static conditions, heavy solids content and wellbore cleaning inefficiency. The wells drilled with casing are more gauged and the quality of the cement sheath is better. Casing drilling can provide better protection for logging tools and allow many conventional tools to be used without any modification.Casing Drilling can significantly reduce the cost of drilling through harsh environments. Additionally, drilling hazards of HPHT wells will be minimized because Casing Drilling can eliminate drilling problems such as stuck pipes, well control incidents, surge and swab effects, wellbore instability, and lost circulation. However, to ensure that this technology can present the previously argued benefits, there are some challenges that need more studies. Most of these issues are related to the manufacturing features of the materials (e.g., dope channels and substantial thermal expansion) and excessive loads (e.g., wear, torque and drag). The recommendations suggested in the study can help in limiting and overcoming these challenges.The proposed methodology can potentially take drilling HPHT wells to a new level and also pave the way for xHPHT environment. Casing Drilling opens a new window to the current technologies and tools in HPHT wells without significant modification. Also it is a potential option to eliminate economic, operational and HSE challenges in drilling HPHT wells.

Directional Casing While Drilling (DCwD) Heralds a Step Change in Drilling Efficiency from a Producing Platform Graeme Dawson; Graeme Dawson Schlumberger Search for other works by this author on: This Site Google Scholar Andrew Buchan; Andrew Buchan Schlumberger Search for other works by this author on: This Site Google Scholar Ilen Kardani; Ilen Kardani Schlumberger Search for other works by this author on: This Site Google Scholar Andrew Harris; Andrew Harris Tesco Search for other works by this author on: This Site Google Scholar Lonnie Wercholuk; Lonnie Wercholuk Tesco Search for other works by this author on: This Site Google Scholar Khairul Amir Khazali; Khairul Amir Khazali Petronas Carigali Sdn. Bhd. Search for other works by this author on: This Site Google Scholar Keith Sisson; Keith Sisson Petronas Carigali Sdn. Bhd. Search for other works by this author on: This Site Google Scholar Abdul Halim; Abdul Halim Petronas Carigali Sdn. Bhd. Search for other works by this author on: This Site Google Scholar Heru Hermawan Heru Hermawan Petronas Carigali Sdn. Bhd. Search for other works by this author on: This Site Google Scholar Paper presented at the Offshore Technology Conference, Houston, Texas, USA, May 2010. Paper Number: OTC-20880-MS https://doi.org/10.4043/20880-MS Published: May 03 2010 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Dawson, Graeme, Buchan, Andrew, Kardani, Ilen, Harris, Andrew, Wercholuk, Lonnie, Khazali, Khairul Amir, Sisson, Keith, Halim, Abdul, and Heru Hermawan. "Directional Casing While Drilling (DCwD) Heralds a Step Change in Drilling Efficiency from a Producing Platform." Paper presented at the Offshore Technology Conference, Houston, Texas, USA, May 2010. doi: https://doi.org/10.4043/20880-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search nav search search input Search input auto suggest search filter All ContentAll ProceedingsOffshore Technology ConferenceOTC Offshore Technology Conference Search Advanced Search AbstractDirectional casing while drilling (DCWD) utilizing a rotary steerable system or a steerable positive displacement motor is a recent enabling technological application of proven casing while drilling. DCWD has been successfully applied in wells in the North Sea and Middle East using both rotary steerable systems and PDMs, proving up its operational reliability. The technology has most recently been utilized in a project from a producing platform in the Asia Pacific region. While this DCWD application increases the challenges of directional drilling, the project was completed successfully in terms of increasing ROP and lowering the time and cost to drill the top hole section of the well.Top hole directional drilling of wells in high density locations such as multi-well producing platforms require carefully planned, detailed procedures and reliable techniques to result in a safe and efficiently drilled wellbore. The procedure, in addition to directional capabilities, requires that the well meet the demands of anti-collision concerns within the torque and hydraulic operating parameters of the formation. The drive for continuous improvements led the field operator to choose DCWD technology to deliver step changes in drilling performance while meeting the company's strict operational and safety directives.The successful effort was a carefully planned and implemented operation that required the close cooperation of the operator, directional drilling company and drilling contractor during the entire procedure. This close interaction between all parties led to three world records and the world's first application of another enabling technology, including:World's deepest 13 3/8?? DCWD job;World's highest angle directional well with 13 3/8?? DCWD;World's fastest rate of penetration for a 13 3/8?? DCWD;World's first application of Gyro MWD with DCWD. Keywords: assembly, bha, torque, rop, application, otc 20880, efficiency, directional, platform, upstream oil & gas Subjects: Drilling Operations This content is only available via PDF. 2010. Offshore Technology Conference You can access this article if you purchase or spend a download.

This paper describes a refrigeration system using a natural refrigerant that has been developed to reduce significantly both direct and indirect greenhouse gas emissions. The new system uses both R-404A and CO 2 (R-744) as refrigerants. The new system has very low global warming potential compared with conventional HFC systems which reduces significantly direct emissions. Indirect emissions are also much reduced as the system efficiency is much greater than achieved using conventional HFC refrigeration. Copyright , Manchester University Press.

Abstract Erosion is a form of wear that has been found on the drilling tools used in the oil and gas industry that can, in some cases, severely shorten the life of the tools. In spite of its importance, there has been virtually no attention paid to it in drilling engineering research. This paper focuses on the modelling of erosion and the application of the developed models to improve the design of drilling tools. The mechanism of erosion, which is controlled primarily by the impact velocity and angle, has been formulated based on experimental and theoretical work done in material science. These algorithms were developed for transient simulations of the erosion of any surface in 2D geometry. Based on these, an "Erosion Simulator(1)" has been written, which is able, in combination with any computational fluid dynamics (CFD) software, to simulate erosion in downhole tools. Actual data from TESCO Corporation casing drilling tools(2) has been used to calibrate the physics of the process and validate the software. The simulator has been used to modify the geometry of the under-reamer casing-drilling tool, which resulted in a substantial decrease in erosion rate and therefore an increase in the tool's life. Introduction Erosion, as a form of material wear, has been reported in many areas of the oil and gas industry. An example of erosion in drilling tools is the TESCO Corporation (hereinafter TESCO) "underreamer" tool used in casing drilling(1) (see Figures 1 and 2). Erosion in the drilling industry is important because it can lead to an increase in time and cost of operation. In the case of drilling tool failure from erosion, eroded parts must be replaced. This will cause unexpected extra rig time in order to pull out the drill string and run it with new parts into the wellbore. Besides the cost of operation, erosion may be dangerous. Tool failure can cause a blowoutand be a potential for loss of lives. This paper focuses on an erosion simulation in order to understand and predict erosion phenomena in drilling tools, with the ultimate goal of improving tool design and extending its life. History of Erosion Research Erosion (i.e., a form of wear) occurs when fluid containing solid particles impacts a solid surface. The intensity of erosion is commonly measured as a specific weight loss (rate of material removal from the surface) and expressed as Er (the weight of material removed by unit weight of impacting particles). During the 1960s and 1970s, a number of important experiments were done in the area of metal wear that laid the foundation for the current understanding of the phenomena. Erosion experiments during that period covered impact velocities up to 550 m/s and particle sizes of up to 1,000 μm [Tilly(3)]. Different velocities and particles can cause different types of damage. During this time, scientists and researchers determined the relationship between erosion rate, the type of material, size of particles, velocity, and angle of impact.