The first step is to determine the depth at which the sticking has occurred. This chapter presents general procedures for drill string design. During the drilling operation the drill string is always in contact with the inside of the hole. Pdf sucker rod string design of the pumping systems. The casing string design program for windows, casing2, has been developed jointly by lone star steel company and maurer engineering inc.
Please dont forget to read all the sheets in a single workbook. Mechanical design spreadsheets these mechanical design spreadsheets are good and simple excel calculation sheets for vessel components designing. In the graphic design sheet click on a cell in the string column and select the drill pipe heavey weight drill collars or the tools you have listed. Request pdf basics of drill string design introduction drill string components. The drill string design evaluates torque, drag, hydraulics and slip crushing. Disk drill is a data recovery software for mac os x with free disk management tools. Drill design software software free download drill design. Disk drill means recovery for all major file types and file systems.
New updated material includes conversion tables into metric. Progressive tool design and analysis for 49 lever 5 stage. Bha, bha component, bha design, dogleg severity, drill string, drilling. Casing design from surface to current casing point.
Such a drill string would be used on large drilling rigs. The course provides a comprehensive treatment of drill string design as well as the avoidance of operational problems and wear on equipment following the api recommended practices for design and operating limitations as well as the standard ds1 for design and inspection. Lecture 07a 1 calculation of neutral point when the. A stuck drill string results in a major nonproductive cost in extended reach drilling engineering. Abes drill tap chart is a free pocket pc program that helps to figure out the correct drill sizes when either tapping or drilling clearance holes for common standard and metric bolt threads. Objectives at the end of this lecture you will be able to describe. Well planning and trajectory design, bottom hole assembly bha design, drill string design, torque and drag analysis, as well as hydraulics and hole cleaning. The drilling assembly handbook is broken down into eleven 11 major sections, as described in the table of contents. Approximate weight of dp and tool joint calculations of approximate weight.
We are constantly updating our materials to reflect the latest technology applications for both nearvertical and highangle well designs while maintaining a thorough grounding in the fundamentals. Graphical design method casing design itself is an optimization process to find the cheapestcasing string that is strong enough to withstand the occuring loads over time. Drill design software software free download drill. This insures that a string of pipe is always maintained in the drilled hole. Short cylindrical piece attached to each end of drill pipe via a flash weld or. Pilot hole directional drilling pilot hole directional control is achieved by using a nonrotating drill string with an asymmetrical leading edge. Abes drill tap chart utilizes an xml file to store all. The bit side force is the most important factor affecting the drilling tendency. As a result of the limitation with the current operational practices, calculation methods are. Oilfield handy aims to ease the life of oilfield personnel and petroleum, mud engineers by providing various onhand calculations. In addition, there are many other related monographs, including casing strength computation and design hao and gong, 1987, finite element method for drill string mechanical analysis yu, 1998. If bending stiffness is also included, such a procedure fails since the order of the. Also, treated in this work are the possible remedies for high pressure, high temperature wells. In casing design the upper most joint of the casing string is considered the weakest point in tension, as it has carried the total weight of casing strings.
The design parameters and a stepbystep procedure of designing a string are given in api rp 7g, 16th ed, section 7. Drill pipes the design process shall address the following items. To drill a well, the rock beneath the bit has to be destroyed. The asymmetry of the leading edge creates a steering bias while the nonrotating aspect of the drill string allows the steering bias to be held in a specific position while drilling. Index terms deflections, drill, principal, stresses, strings i. The drill bit has a male thread or threaded pin pointing up. The drill string is supported by the top drive in the derrick, which rotates the drill string at the surface to drive the bit and allow the drill string to advance downhole. Therefore, bha design and modeling the directional tendency capability become an important aspect in the planning phase. Formulas and calculations for drilling operations request pdf. Part of this destruction force is obtained by a certain amount of weight on bit wob which forces the bit against the rock. Drillstring design manual strength of materials bending scribd. Drillstring design manual free download as pdf file. During the projects of deepwater abandonment, casing withdrawal is a necessary process.
Xls download process, piping, instrumentation, mechanical, drilling and civil design spreadsheets posted by akki on 6. Many tendency modeling applications today still use the threepoint contact theory. Because the drill string is designed in single size, and its length is limited. Heavy weight drill pipe use minimum number of drill collars in the bha. May 22, 2019 the normal drill string design practice aim is to avoid abrupt changes in component cross sectional areas abrupt changes can lead to concentrations in bending stresses which in turn can lead to a twist off refer to figure 8. Figure 31 shows a schematic of a standard rotary drill string used to drill deep boreholes with direct circulation. Pdf formulas and calculations for drilling production. The normal drill string design practice aim is to avoid abrupt changes in component cross sectional areas abrupt changes can lead to concentrations in bending stresses which in turn can lead to a twist off refer to figure 8. With the development of offshore oil and gas exploration, the development tendency is expanded from the shallow sea to the deepwater gradually. The noticeable exception is the drilling of vertical wells. Sep 10, 2014 drill string design drill pipe pressure control equipment drill string loads monitoring equipment 2 3. It makes the job go quicker and holds the tolerances very well.
Part of this destruction force is obtained by a certain amount of weight on bit wob which forces the bit against the. For any torque and drag model, the friction force and the weight of a drill string element affect in. An optimum drill string design is the one that meets all of the operational parameters, for given drilling constraints and conditions, and considers rig pipe management. Drilling fluids have a number of alternative names, acronyms and slang terms used within the industry. Basics of drill string design request pdf researchgate. By using this design we can produce accurate components. The friction coefficient is a property of the two surfaces in contact with each other. Typical drill string design based on margin of overpull design parameters. Oilfield handycalc for ios free download and software. The course provides a comprehensive treatment of drill string design as well as the avoidance of operational problems and wear on equipment following the api recommended practices for design and operating limitations as well as. Drill pipe pressure control equipment drill string loads monitoring equipment.
Combined drill string design and length limit calculation in. Sargents drilling utilities is a freeware program that performs most of the wellrelated calculations that the man on the rig needs in his daytoday work. Although the drill string is often a source of problems such as washouts, twistoffs, and collapse failures, it is seldom designed to prevent these problems from occurring. Loading conditions during life of well drilling operations, completion procedures, production, and workover operations. Pdf formulas and calculations for drilling production and. Jul 16, 2011 a stuck drill string results in a major nonproductive cost in extended reach drilling engineering. The drill collar lengths are in accordance with the range designations of table 11 1. The source links are not hidden so that you can explore further. Advances in digital technology and modeling allow us to provide a better tool to design the bha. The selection and design of a particular drilling fluid and its properties depends on the complexity of the.
The drill string is hollow so that drilling fluid can be pumped down through it and circulated back. A study of friction factor model for directional wells. Design means determination of length, weight, grades of drill. Fundamentals of sustainable drilling engineering, pp. The bha design objective for directional control is to provide the directional tendency that will match the planned trajectory of the well. One option to use with a template is a smaller pilot drill without a hammer drill to ensure that the hole is not. Casing design for high pressurehigh temperature wells. For manufacturing 49 lever 5 stage tool, manufacturing process is press tool design. Formulas and calculations for drilling production and workover 2e.
A drill string on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid via the mud pumps and torque via the kelly drive or top drive to the drill bit. Formulas and calculations for drilling, production and. The numerical values of these design loads were plotted on a graph and interpreted. The term drill stem is used to refer to the combination of tubulars and accessories that serve as a connection between the rig and the drill bit rgu lecture slides. Calculation of neutral point when the drillstring is lowered into the borehole, the total length of the drillstring is under tension due to its own weight which is partly counterbalanced by the buoyancy. Drill pipe is added behind the reamers as they progress toward the drill rig. It will also discuss troubleshooting of the problems that may occur. Introduction the drillstring design is the mechanical linkage connecting the drillbit at the bottom of the. Bottom hole assembly bha the primary component of the bha is the drill collar. Variations in mud rheology and flow rates from depth in to depth out. The ratio ic between the moment of inertia i and radius c of the pipe is directly related to the resistance to bending.
The design aspects of critical importance and factors controlling drill pipe selection are. For any torque and drag model, the friction force and the weight of a drill string element affect in the total load of the drill string. Drillstring design manual strength of materials bending. Drillstringdesignbhadesign1 i introduction to drill. Formulas calculations for drilling, production workover gateaiotspe. The iadc definition of a drill string is drillpipe with tool joints attached. In addition, there are many other related monographs, including casing strength computation and design hao and gong, 1987, finite element method. Determination of drill collar and or hwdp length 4. The drill string is tapered to maximize strength and hanging length by using lighter 5 in. Slug calculations accumulator capacity usable volume per bottle bulk density of cuttings using mud balance drill string design limitations tonmile tm calculations cementing calculations weighted cement calculations calculations for the number of sacks of cement required calculations for the number of feet to be cemented. Introduction uring oil and natural gas, borehole drilling operations, there are many engineering problems to contend with, as discussed in 1, including the failure of the drill string ds owing to the combined compression, buckling and torsional stresses encountered. Scribd is the worlds largest social reading and publishing site. Standard drill string air and gas drilling netwas group oil.
If you are a drilling supervisor or a well site drilling engineer, you have, no. The most widely used name is mud or drilling mud and both these terms will be used interchangeably. Although the drill string is affected mainly by the tensile force in the shallow sea, the extruding force is the main factors of dill string length. It is the connection between the rig and the drill bit. Bhaweb video jar triggering load bha properties wall force torsional dampening torque. Methods of measurement have been proved useful for determining the stuck points, but these operations take considerable time.
The topics in the index will give the page numbers of information relating to specific drilling problems which you might face on the rig floor. At the bottom of the drill string is the drill bit. Procedures for drill string design engineering essay. Functions of drill pipe, drill collars and bha selection grades of drill pipe and strength properties thread types and tooljoints drill collar weight and neutral point bending stress ratios and stiffness ratios margin of overpull basic design calculations based on depth to be drilled. In many cases, a few minutes of drill string design work could prevent most of. Drill string design limitations tonmile tm calculations cementing calculations weighted cement calculations calculations for the number of sacks of cement required calculations for the number of feet to be cemented setting a balanced cement plug differential hydrostatic pressure between cement in the annulus and mud inside the casing. Bottomhole assembly bha design purpose components assemblies. This document provides the principals utilized for drill string design in the oil well drilling industry. Chapter3 drill string and casing the drill string is an important part of the rotary drilling process. Use features like bookmarks, note taking and highlighting while reading formulas and calculations for drilling, production and workover. Drill string design drill pipe pressure control equipment drill string loads monitoring equipment 2 3. The number of drill collars in a drill string depends on how much weightonbit wob is required to allow the drill bit to be advanced efficiently drill string design will be discussed in section 3. The most complete manual of its kind, this handy book gives you all the formulas and calculations you are likely to need in drilling operations. Drill string design drilling procedures netwas group oil.
Formulas and calculations for drilling, production and workover kindle edition by lapeyrouse, norton j download it once and read it on your kindle device, pc, phones or tablets. The term is loosely applied to the assembled collection of the smuggler pool, drill collars, tools and drill bit. The main advantages of omitting drill collars in inclined wells are. As a result of the limitation with the current operational practices. Drill string and components this chapter of the iadc drilling manual is concerned with the specifications, operating data, and the care and handling of drill string. The design aspects of critical importance and factors controlling drill pipe selection are highlighted. We have been presenting drill string design workshops for over 12 years for all types of operations around the world. Combined drill string design and length limit calculation. The general stepbystep procedure for drill pipe selection using the. The existing design of sucker rod string mainly focuses on the simplifying assumptions that rod string was exposed to simple tension loading.
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