In this case, tool joint parts are welded to drill pipe body. The main advantages of omitting drill collars in inclined wells are. When the driller wants to steer the drill head, he stops rotating. Virtually all the mathematics required out on the drilling rig is here in one convenient source, including formulas for pressure gradient, specific gravity, pump output, annular velocity, buoyancy factor, volume and stroke, slug weight, drill string design, cementing, depth of washout, bulk density of cuttings, and stuck pipe.
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. As a result of the limitation with the current operational practices, calculation. The design aspects of critical importance and factors controlling drill pipe selection are highlighted. Once you have tried the free trial version you can make a secure purchase from this link. The drill pipe has two tool joints, one female is called a box and the other male is called pin. Under thus, it takes a look at useable volume per bottle, surface application, deepwater applications, and accumulator precharge pressure. This chapter presents general procedures for drill string design. Use features like bookmarks, note taking and highlighting while reading formulas and calculations for drilling, production and workover. 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. Formulas and calculations for drilling operations request pdf. How to calculate overpull on a drill pipe sciencing. This is a lessonbylesson distributed learning course. Many tendency modeling applications today still use the threepoint contact theory. Request pdf basics of drill string design introduction drill string components drilling bit drill string design bit design drilling bit selection drilling bit.
Imagine a drill string just before weight on bit wob is applied. Subsequently, it explains some cementing calculations and stuck pipe calculations. The emphasis is on the theory behind these drilling elements in order to develop a greater understanding of the principles involved in drilling a well. Tool joint component used to connect drill pipe lengths to form a drill string.
A fishing jar is used to free stuck drill string and is added to the drill string only when bha positioned either in heightweight drill pipe figure or in drill. Heavy weight drill pipe use minimum number of drill collars in the bha. 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. Bha design 32 bit is a complete analysis for bottom hole assembly design. Presented in easytouse, stepbystep order, formulas and calculations is a quick reference for daytoday work out on the rig. Bottomhole assembly bha design purpose components assemblies. Plus the maximum allowable over pull on the selected drill string size at the weakest point. Recommended practice for drill stem design and operating limits. The drill string is composed of drill pipe, heavy weight drill pipe, drill collars and other components like stabilizers and drilling jars.
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. Drill pipe dp drill pipe body with tool joints welded on using frictionwelding process. Introduction the drillstring design is the mechanical linkage connecting the drillbit at the bottom of the. 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 drilling engineering workbook is a correspondence distributed learning course which covers the important elements of drilling a well. Formulas and calculations for drilling, production and. To drill a well, the rock beneath the bit has to be destroyed. Volumetric calculations for water or flushing chemicals ahead and behind the cement plug. This abstract presents information to consider in the design of a safe and effective production casing string for well production and also as a conduit for a fracture stimulation. 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.
These include volumes and strokes, slug calculations, accumulator capacityuseable volume per bottle, bulk density of cuttings using mud balance, drill string design limitations, cementing calculations, weighted cement calculations, calculations for the number of sacks of cement required, calculations. Use features like bookmarks, note taking and highlighting while reading formulas and calculations for drilling. Pdf formulas and calculations for drilling production and. It also serves as a handy study guide for drilling and well control certification courses. Change 5 8 inch to 3 4 inch in note 4 for pages 15. Advances in digital technology and modeling allow us to provide a better tool to design the bha.
Sep 10, 2014 drill string design drill pipe pressure control equipment drill string loads monitoring equipment 2 3. Addendum 1 to recommended practice for drill stem design and operating limits 1 page 3, 4. Use this value for collapse safety factor calculation. The term is loosely applied to the assembled collection of the smuggler pool, drill collars, tools and drill bit. Pilot hole directional drilling pilot hole directional control is achieved by using a nonrotating drill string with an asymmetrical leading edge. Tool joint pin is connected to one drill pipe end, the tool joint box is connected to the other pipe end. The drill string design evaluates torque, drag, hydraulics and slip crushing. Presented in an easytouse format, this second edition of formulas and calculations for drilling operations is a quick reference for daytoday work out on the rig. A quick reference for daytoday work out on the rig, this text includes formulas for pressure gradient, specific gravity, pump output, annular velocity, buoyancy factor, volume and stroke, slug weight, drill string design, cementing, and much more. Index terms deflections, drill, principal, stresses, strings i.
As a result of the limitation with the current operational practices, calculation methods are. The drill head is advanced into the soil by pushing and rotating the drill head and drill string. A complete analysis for bottom hole assembly design bha design torque and harmonics. This chapter presents basic calculations used by oilfield personnel. 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.
Addendum 1 to recommended practice for drill stem design and operating limits. Procedure for selecting dc 1 determine the buoyancy factor bf of the mud weight. The formulas and calculations are provided in either english field units or in metric units. 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. The first step is to determine the depth at which the sticking has occurred. The outer diameter of the tool joint is larger than the body of the drill pipe to accommodate the threads. Formulas and calculations for drilling, production, and. Dec 08, 2015 the drill pipe constitutes the majority of the drill string length. A stuck drill string results in a major nonproductive cost in extended reach drilling engineering. That is, f e f f 0, a state of incipient, but not yet realized, buckling. Methods of measurement have been proved useful for determining the stuck points, but these operations take considerable time. The drillstring means the tubulars and the accessories used to run the drill bit to the bottom.
A key seat is formed after part of the drill pipe string has passed through the dogleg. Drillstring design manual strength of materials bending scribd. Basic calculations capacity, drill string design limitations, stuck pipe calculations 3. Lecture 07a 1 calculation of neutral point when the.
Horizontal environmental well design and installation. Combined drill string design and length limit calculation. The combination of thrust and rotation cuts the soil, excavating a borehole the diameter of the duckbill. Drillstring design manual free download as pdf file. Drill string design drill pipe pressure control equipment drill string loads monitoring equipment 2 3. The design parameters and a stepbystep procedure of designing a string are given in api rp 7g, 16th ed, section 7. This section of the drilling manual discusses drill string care and use and gives examples of the types of problems usually encountered when the drill string is improperly used or used beyond its physical capabilities. One factor engineers take into account when selecting equipment is overpull, which is how much tension an operator can use to. Drilling software download free trials and try before you buy. Drill pipe pressure control equipment drill string loads monitoring equipment. Furthermore, it highlights some limitations of drill string design and explains some tonmile tm calculations. Over 500 spreadsheets for mechanical and civil engineering free download 24 august 2018 off by the engineering community here a big list of spreadsheets available for download from piping, process, instrumentation, mechanical, drilling and civil. 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. The general stepbystep procedure for drill pipe selection using the graphical method is given.
Since the drill pipe is in tension, it is trying to straighten itself while going around the dogleg. The formulas and calculations are provided in either english pdf field units or in metric units. The casing string design program for windows, casing2, has been developed jointly by lone star steel company and maurer engineering inc. The bottom hole assembly bha is the components used above the bit without taking in consideration the drill pipe. Casing design design criteria tensile force tensile forces in casings originate from its weight, and shock loading. Make sure that the connections are free of dirt or other debris. The free end of the mandrel is shaped in the form of a hammer to. Tension calculations assume the string is hanging vertically. Oilfield handy aims to ease the life of oilfield personnel and petroleum, mud engineers by providing various onhand calculations. The drill string is hollow so that drilling fluid can be pumped down through it and circulated back. This creates a lateral force that causes the drill pipe to cut into the center. The noticeable exception is the drilling of vertical wells. Scribd is the worlds largest social reading and publishing site. Part of this destruction force is obtained by a certain amount of weight on bit wob which forces the bit against the rock.
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. Kill sheets and related calculations kick analysis, annular stripping procedures 5. Drilling fluids mud density, mixing fluids, solids analysis 4. Therefore, bha design and modeling the directional tendency capability become an important aspect in the planning phase. 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. This edition includes additional coverage on cementing, subsea considerations, well hydraulics, especially calculating for hydraulic fracturing methods, and drill string design limitations. Drill design software software free download drill design. If the drill string is hung an infinitesimal distance off the bottom of the hole drilled to date, then the neutral point will be at the bottom of the tubular string. 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. Procedures for drill string design engineering essay. 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. Separate chapters deal with calculations for drilling fluids, pressure control, and engineering.
Oilfield handycalc for ios free download and software. 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 workover 2e. Drilling software download free trial downloads try before. Interested in learning more about drill string components. Jul 16, 2011 a stuck drill string results in a major nonproductive cost in extended reach drilling engineering. 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. Virtually all the mathematics required on a drilling rig is here in one convenient source, including formulas for pressure gradient. Recommended practice for drill stem design and operating.
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. Formulas and calculations for drilling operations, 2nd. The term drill stem is used to refer to the combination of tubulars and accessories that serve as a connection between the. George armistead, larry wolfson we have been presenting drill string design workshops for over 12 years for all types of operations around the world. For high angle and extended reach drillin this assumption will be modified as it would otherwise result in too conservative a design. Excessive torque and drag in the design of a wellbore trajectory and drillstring. If bending stiffness is also included, such a procedure fails since the order of the differential equation increases by two. Aug 24, 2018 over 500 spreadsheets for mechanical and civil engineering free download 24 august 2018 off by the engineering community here a big list of spreadsheets available for download from piping, process, instrumentation, mechanical, drilling and civil. Pdf formulas and calculations for drilling production. This section of the drilling manual discusses drill string care and use and gives examples of the types of problems usually encountered when the drill string is improperly used or used. During the projects of deepwater abandonment, casing withdrawal is a necessary process.
Basic design calculations based on depth to be drilled. Drilling into the earth to extract resources is a complex endeavor that begins with finding a site and selecting the appropriate drilling equipment. Drill design software software free download drill. With the development of offshore oil and gas exploration, the development tendency is expanded from the shallow sea to the deepwater gradually. Bha design for drilling strings includes bha graphics and critical bha. Used to transmit rotation and weight to bit via drill pipe and drill collars. Objectives at the end of this lecture you will be able to describe. The drill string is advanced along the predetermined drill path while drilling fluid is pumped down the inside of the bore pipe and exits through the drill head.
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