The casing string design program for windows, casing2, has been developed jointly by lone star steel company and maurer engineering inc. The use of good software can improve a drilling engineers output by 50100%. Design is based on the maximum mud weight at the casing depth 53. It provides comprehensive triaxial and workingstress design for burst, collapse, and axial installation, and servicelife loads to maximize the use of the most costeffective casing. In other words, if the triaxial stress exceeds the yield strength, a yield. Api bulletin, 5c3, 1989, formulas and calculations for casing, tubing, drill. An example of a typical casing program that illustrates each of the specified. Mechanical performance experiments on rock and cement.
A twodimensional state of s tress in which only two normal stresses a re present is called b dimensional state of stress in w hich normal. The fivedays course is designed to concentrate on the. The original idea was to give the men supervising drilling and workover rigs some good software to speed up calculations. Burst design assume no backup fluid on the outside of the casing. Software programs aid horizontal drilling decisions offshore. Simulate reservoir response and reservoirtowellbore interactions for a deeper understanding of expected performance. Advanced triaxial testing part 2 is due to be released may 20 visit. The application of triaxial testing to flexible pavement design c. Ensure the wells mechanical integrity by providing a design basis that accounts for all the anticipated loads that can be encountered during the life of the well. In order to evaluate a given casing design, a set of loads is necessary. Historically casing burst design has been based on a uniaxial assessment of the hoop stress due to the design pressure or a biaxial assessment of pressure or a biaxial assessment of the interaction of the hoop and axial stresses in accordance with some failure criteria.
The last day of this course participants will learn about tubular design software and some of the ways which it can be used in well planning and casing design. To isolate porous media with different fluidpressure regimes. Casing design the following topics will be discussed functions of casing casing types casing specifications casing design bending effects buoyancy effects shock loads functions of casing to keep the hole open and to provide a support for weak, or fractured formations. A triaxial shear test is a common method to measure the mechanical properties of many deformable solids, especially soil e. Drilling software download free trial downloads try before. The fundamental basis of casing design is that if stresses in the pipe wall. Reliabilitybased casing design for geothermal wells european.
Tubing design and hpht wellplans stateofthe art multiphase hydraulic and temperature prediction model lets you safely and accurately perform production loads and. Triaxialloadcapacity diagrams provide a new approach to casing provide a new approach to casing and tubing design analysis. As it is well known fact that the presence of notch introduces triaxial state of stress and this causes the. They requested a mechanical design and several industrial design concepts with appealing schemes for the device, cartridge, and cartridge interface. Dec 12, 2016 a photograph of a modern triaxial cell is shown in figure 3. Model bending stress, piston forces, shock loads and formation squeeze forces. Downloads hdd plan for horizontal drilling read more. A photograph of a modern triaxial cell is shown in figure 3. Improved burst model for casing and tubing design ntnu open. Wellplan well planning software cloud, casing, tubing, hpht. The triaxial stress of the userdefined connection can then be. Introduction this paper provides an introduction to the triaxial test, explaining why the test. An excel based casing design application request pdf.
This chapter highlights the reasons for undertaking tubing stress analysis and discusses tubular manufacture, its specifications, their stress and strain analysis, and grades. Triaxial casing stress analysis with transparent models for burst, collapse, axial and triaxial stress. The program is useful in the design and analysis of any casing or tubing string. Using interactive graphicsbased tools, stresscheck software enables quick, systematic and accurate evaluation of casing wear limits, minimumcost. The uniaxial compressive strength ucs is the maximum axial compressive stress that a rightcylindrical sample of material can withstand before failing. The application of triaxial testing to flexible pavement design. Triaxial evaluation of wellbore loads is used extensively for casing and tubing string design and analysis. Todays casing and tubing design software uses a combination of. Mar 31, 2016 triaxial evaluation of wellbore loads is used extensively for casing and tubing string design and analysis. Casing design the following topics will be discussed functions of casing casing types casing specifications casing design bending effects buoyancy effects shock loads functions of casing to keep the hole open and to provide a support for weak, or. Load bearing capacity load calculation casing design. External loads and temperature profiles can be chosen per load case. The day will end with the participants breaking into teams.
Also, we needed to ensure the concepts achieved all function an manufacturing targets. Dec 16, 2009 using interactive graphicsbased tools, stresscheck software enables quick, systematic and accurate evaluation of casing wear limits, minimumcost design solutions, comprehensive triaxial design. Casing design factors preliminary design casing design. Advanced casing design, abu dhabi, uae, the course emphasizes the practical application of casing design principles and theory from a basic level through to advance. In this paper, mechanical performance experiments on rock and cement are carried out first, and then a finite element mechanical model of thermal recovery wellbore based on thermalstructure coupling is. Cdex a better and simple way to casing design youtube. Lowcost design stresscheck software lowers the cost of casing and tubing. In analogy with the discussion on the triaxial design factor below, the same triaxial design factor of 1. A triaxial based collapse strength method was recently adopted by the american petroleum institute api, and an addendum issued to api technical report 5c3 tr 5c3. Chaoyang university of technology triaxial shear testing 2 triaxial cells triaxial tests are performed using a triaxial cell. Triax is a triaxial stress program that calculates burst and collapse. The appearance of commercial casing analysis software has made triaxial stress analysis possible. In a triaxial shear test, stress is applied to a sample of the material being tested in a way which results in stresses along one axis being different from the.
The above equation is the burst design pressure for biaxial stress analysis. Software programs aid horizontal drilling decisions. Cdex is a casing design software that implements an industryaccepted physics model to perform accurate and practical casing designs for complicated drilling circumstances. Introduction this paper provides an introduction to the triaxial test, explaining why the test is performed, the stress state of a tested soil, required. The modified triaxial design method requires the use of the subgrade andor base texas triaxial class as derived from laboratory test results. The triaxial stress analysis windows application program triaxl has been jointly.
Collapse strength of casing subjected to combined load. Cdex, pvis casing design software, implements an industryaccepted physics model to perform accurate and practical casing designs for complicated drilling circumstances. A triaxial based collapse strength method was recently adopted by the american petroleum institute api, and an addendum issued to api. It provides comprehensive triaxial and workingstress design for burst, collapse, and axial installation, and servicelife loads to maximize the use of the most cost.
Cdex casing design expert drilling software pegasus vertex, inc. We are committed to researching and applying the most effective methods and technically advanced techniques. The claims made by participants have not been verified or endorsed by epa. Triaxial design ellipse plot axial stress check for both casing body and connection. Casing design is more complicated in horizontal wells due to varying ecds along horizontal sections and other wellbore factors. Design factors and comparison between uniaxial and triaxial stress will be evaluated. A more detailed discussion of the design and construction of triaxial cells and associated equipment is presented by bishop and henkel 1957 and by andersen and symons 1960. The statements made during the workshop do not represent the views or opinions of epa. Similarly, the designer might wish to allow loads between the uniaxial and triaxial tension ratings. Feb, 2017 cdex, pvis casing design software, implements an industryaccepted physics model to perform accurate and practical casing designs for complicated drilling circumstances. Wellplan well planning cloud casing design software. Evaluating a material for its texas triaxial classification is covered in tex117e, triaxial compression for disturbed soils and base materials. Design is based on the weight of the entire casing string. Stabview is a stateoftheart commercial well planning software package for analyzing the risks of.
Triaxial loadcapacity diagrams provide a new approach to casing provide a new approach to casing and tubing design analysis. Custom export options, including drilling programs, application for consent, etc. Triaxial was prepared with a powerpoint presentation identifying the differences and perceived pros and cons. Oct 23, 2014 design is based on the weight of the entire casing string. Translation of the load conditions into a threedimensional stress state is possible with design softwares.
The soil sample rests on a base pedestal and is overlain by a rigid. The process of selecting pipe typically begins at the bottom of the string, where. Triaxial stress, biaxial stress, and uniaxial stress. Collapse design assume that the casing is empty on the inside, that is, no pressure inside the casing and no buoyancy effect. True triaxial stress perforating in true downhole environment. Hdd plan is a userfriendly borehole design interface for the unique requirements of the hdd horizontal directional drilling, industry to plan drilling boreholes starting and ending at any inclination and with multiple tangent and curve bend sections applications for this program include civil. Slope stability, appendix d shear strength characteriscs em 1110. Casing loads are principally pressure loads, mechanical loads, and thermal loads. On day three, the spreadsheet will be completed with formulas for calculating triaxial stress of various load states which casing may be exposed. Programme overview the fundamentals of casing design training programme covers the relevant subjects required to understand the structural mechanics of down hole tubular. Drilling software download free trials and try before you buy. Design concepts will be covered for a wide range of straightforward, as well as hostile environments. This abstract presents information to consider in the design of a safe and effective production. This might be true in existing fields if the well and completion design remain unchanged, but for all other cases, a tubing stress analysis of some form should be performed.
The fundamental basis of casing design is that if stresses in the pipe. Tubing design and hpht wellplans stateofthe art multiphase hydraulic and temperature prediction model lets you safely and accurately perform production loads and addresses required hpht issues in the planning phase. Tubular design software and comprehensive casing design. Triaxialloadcapacity diagrams provide a new approach to. Manual casing design fast onesection casing design minimum cost casing design worst scenario design triaxial design ellipse plot axial stress check for both casing body and connection customizable design report microsoft windows 10 microsoft windows 88. Rulebased design allows automatic well design, based on kick tolerances and predefined load cases per casing. The casing string design program for windows, casing2, has been. Triaxial casing design oliasofts casing design module offers full triaxial casing design, compatible with norsok, iso, and api standards. Drilling and completion software allows engineers to better plan and troubleshoot wells. Thermal stress deformation can cause serious casing damage and failure problems in thermal recovery wells. A computer program has been developed that generates a twodimensional 2d graphic representation to display the effect of anticipated service conditions on specific casing and tubing. Triaxial was asked to minimize the overall envelope of the product.
Oliasoft welldesign casing design module provides complete stress. The capabilities and limitations of casing design software for advanced casing design will be addressed. We have unmatched excellence in mechanical disciplines. The program is used by dea participants to calculate stresses in drill strings, ct casing, downhole tools, and other tubulars used in horizontal drilling. The engineer responsible for developing the well plan and casing design is faced with a number of tasks that can be briefly characterized. The details of design of triaxial cells vary from laboratory to laboratory but the essential features of typical cells are shown in fig. The application of triaxial testing to flexible pavement.
Model casing and tubing design loads axial triaxial, burst and collapse versus minimum design safety factors for both pipe body and connections. Cdex, pegasus vertexs casing design software, implements an industryaccepted physics model to perform accurate and practical casing designs for complicated drilling circumstances. Predefined load cases for all authority requirements are available, as well as generic load cases and options for custom loads. Wellbore instability, lost circulation and fracturing, sand production and fault, fracture or bedding. Working stress design wsd, loads are evaluated throughout the entire length of casing from wh to shoe true vertical depths are now fully linked to vertical or directional well geometry accurate tvds for accurate burst, collapse and tensile load calculations user defined custom casing specifications can be added to the database. It is also known as the unconfined compressive strength of a material because confining stress is set to zero. Triaxial casing design oliasoft s casing design module offers full triaxial casing design, compatible with norsok, iso, and api standards. Material aspects, connection selection, performance properties, load cases, design factors, and buckling are just a few of the many topics that are covered. Yoder, research engineer joint highway research project purdue university this paper presents one of the methods of flexible pavement design based on the triaxial test. Service life model with uniaxial, biaxial api 5c3 and triaxial analysis.
Introducon to geotechnical engineering o us army corps of engineers. Triaxial stress refers to a cond ition where only normal stresses act on an element and all shear s an example of a triaxial stress state is hydrostatic pressure acting on a small element submerged i. Course contents the course is underpinned by a well design project that runs throughout the course. Casing loads result from running the casing, cementing the casing, subsequent drilling operations, production and well workover operations. Stresscheck casing design software enables quick, systematic, and accurate valuation of casing wear limits, and can automatically create the minimum cost design.
Burst, collapse, tension, compression, bending, buckling and temperature effects are all incorporated into cdex to analyze the casing strings capabilities. Wellplan well planning software cloud, casing, tubing. This course will focus on casing design, both from an engineering and an operation perspective. Oliasofts casing design module offers full triaxial casing design, compatible with norsok, iso, and api standards. Oliasofts casing design module offers full triaxial casing design, compatible with. If you are a human and are seeing this field, please leave it blank.