Probabilistic assessment of api casing strength in. No allowances were made for corrosion, erosion, mechanical loads, andor bending moments. The technical information contained herein should not be construed as a recommendation. Api bull 5c3 bulletin on formulas and calculations for casing, tubing, drill pipe, and line pipe properties. At first, this paper presents a brief overview of the design characteristics of todays. Analysis of api 5c3 failure prediction formulae for casing. Bulletin on formulas and calculations for casing, tubing, drill pipe, and line pipe properties 1 scope the purpose of this bulletin is to show the formulas used in the calculation of the various pipe properties given in api standards, including background information regarding their development and use. Provides formulas used in the calculations of various pipe properties, also background information regarding their development and use. The api subcommittee on tubular goods has determined that the following modifications are technically necessary to provide a more rigorous calculation for collapse by combining the effects of axial stress and internal pressure. Each criterion is discussed next in order of increasing dt. Bulletin 5c3 api 5c3 standards solutions are the most conservative whereas the international organisation for standardization technical report 10400 iso 10400 recommendations were of klevertomano collapse theory and kleversteward burst theory which are more comparable to the true collapse and burst failures. Api sponsored research yields practical tools and basic science for riskbased, costeffective decision making.
It is the responsibility of the end user to ensure that the material will perform. This bulletin is under the jurisdiction of the committee on standardization of tubular goods. Secure pdf files include digital rights management drm software. Api bull 5c3, bulletin on formulas and calculations for casing, tubing, drillpipe and line pipe properties. Api specification 5ct, 5th edition, april 1 1995 specification for casing and tubing u. The api casing bulletin gives formulas and calculations for collapse resistance of casing under uniform loading.
Pressuretemp ratings api casing swage nipples 8 round. Api bull 5c3 1970, api bulletin on formulas and calculations for casing, tubing, drill pipe, andline pipe properties, first edition, 1970, american petroleum institute, washington, dc. Joint strength of api connections is based on the ultimate strength and not the yield strength. Api bulletin 5c2, 21st edition, october 1999 bulletin on performance properties of casing, tubing and drill pipe.
All burst and collapse pressure ratings are calculated in accordance with api bulletin 5c3 other sizes, materials and threads available upon request maximum set. Api bulletin 5ct, 1992, specification for casing and tubing us customary units, american petroleum institute, fourth edition, nov. Equations to calculate collapse strength for high collapse. Factors which determine the extent of increased strength include. Updated list of api and iso standards for tubulars. Little research, however, has examined the effects of nonuniform loading on casing. Manufacturers may also, if desired, develop design collapse strengths for api pipe.
Interference region of z for api 5c3 burst strength equation. Bulletin on formulas and calculations for casing, tubing, drill pipe, and line pipe properties. This ed 1993 confidential report and the computer programs are for the sole use of participants. Formulae presented here are intended for use with pipe manufactured in. Api bulletin 5c2, 21st edition, october 1999 bulletin on. Fabrication tolerance an overview sciencedirect topics. Collapse calculations using api 5c3 demonstrate that a 22. In the meantime, the current casing true collapse strength cannot be predicted accurately by api bulletin 5c3. Technical report on equations and calculations for casing, tubing, and line pipe used as casing or tubing.
Axial equation the axial strength of the pipe body is determined by the pipe body yield strength formula found in api bulletin 5c3. Api bull 5c3 bulletin for formulas and calculations for casing, tubing, drill pipe, and line pipe properties api rp 5c5 recommended practice for procedures for testing casing and tubing connections. Bulletin on formulas and calculations for casing, tubing. A new octg strength equation for collapse under external. Api bull 5c3 formulas and calculations for casing, tubing. With increasing yield strength of the steel, the difference between the yield strength collapse and the plastic collapse gets larger. Bulletin, 5c3, 1989, formulas and calculations for. Pdf on jan 1, 2018, amirah husna abdul halim and others published reliability analysis of. Api bulletin 5c3, 6th edition, october 1 1994 bulletin on formulas and calculations for casing, tubing, drill pipe, and line pipe properties, also isotr10400.
For imperfections of the api 5c3 collapse formula, the joint apiiso work group. Covers collapsing pressures, internal yield pressures and joint strengths of casing and tubing and minimum yield load for drill pipe. Pressuretemp ratings api j55 and k55 tubing swage nipples. Pdf burst strength of tubing and casing based on twin shear. Formulas and calculations appearing in the th and preceding editions of bull 5c2 were transferred in 1971 to bull 5c3. Due to the increasing demand for oil and gas, coupled with the fact that oil reserves are becoming rather scarce, the petroleum industry is pushed to drill and complete deeper wells.
Formulas and procedures for calculating the values are given in bulletin 5c3. Triaxial stress analysis model triaxl theory and users manual by. The allowable working pressures were calculated based on formula as specified in the api bulletin 5c3. Most but not all premium or proprietary connections are based on the yield strength of the connection. When its document type was changed from a bulletin to a technical report, it was mistakenly reeditioned to a 1st edition based on that change, making it tr 5c3 1st edition when it really should have been tr 5c3 7th edition. Triaxial stress analysis model triaxl theory and users manual by maurer engineering inc. Threaded connections are often the weakest link in this process and are therefore the subject of research and optimization. Minimum wall thickness an overview sciencedirect topics. Bulletin american petroleum institute api 2008 api tr 5c3. Api bulletin 5c3 bul 5c3, fifth edition, july 1989 bulletin on formulas and calculations for casing, tubing, drill pipe, and line pipe properties, which is adopted as is0 10400. Four formulas for collapse are given in api 5c3, each valid for a specific dt range. Api publications may be used by anyone desiring to.
For these cases, the joint api iso work group isotc67 sc5 wg2b has proposed the current api bulletin 5c3 and presented a new collapse strength model with manufacturing imperfections, such as ovality, eccentricity, residual stress, etc. American petroleum institute api bulletin 5c3 sixth edition, october 1, 1994. These new editions provide technical updates that have reached consensus within api s subcommittee on tubular goods and will now give. With fabrication tolerances of 8% on wall thickness, the riser resists collapse with the top 8000 ft 2438 m of riser void. For imperfections of the api 5c3 collapse formula, the joint. Modifications of the formula above can provide an estimate for the collapse strength of shutter screen. While every effort has been made to insure the accuracy of the tables herein, this material is presented as a reference guide only. We are pleased to announce the publications of the 10 th edition of specification 5ct, casing and tubing, and the 7 th edition of technical report 5c3, calculating performance properties of pipe used as casing or tubing. Apiiso work group isotc67 sc5 wg2b have proposed the current api bulletin 5c3, and a new. Download api bull 5c3 formulas and calculations for casing, tubing drill pipe and line pipe. Api bull 5c4, bulletin on round thread casing joint strength with. Calculations for premium class drill pipe are based on formulas in api bul, 5c3 latest edition. Oct 17, 2017 api bull 5c3 bulletin on formulas and calculations for casing, tubing, drill pipe, and line pipe properties. Effect of alloying additions on kissc on ultrahigh strength nisicr steel, bull.
Most oilfield tubulars experience collapse in the plastic and transition regimes. Api bulletin 5c3, 1985, bulletin on formulas and calculations for casing, tubing, drill pipe, and line pipe properties, american petroleum institute, fourth edition, feb. Collapse strength of casing subjected to combined load. Mar 24, 2020 in the case where tool joint diameters have the higher the apk of the matera i,lthe higher the required safe operating tem. Api bull 5c3, petroleum and natural gas industries formulae and calculation for casing. Also, the elastic collapse zone gets bigger, so stronger. Address 333 west sheridan ave oklahoma city, ok 73102 3b. The purpose of this bulletin is to show the formulas used in the calculation of the various pipe properties given in api standards, including background information regarding their development and use. Equations to calculate collapse strength for high collapse casing. Many manufacturers market high collapse casing, which they claim has collapse performance properties that exceed the ratings calculated with the formulae in api bull.
All collapse tests performed at swri will be conducted in compliance with api bulletin 5c3, paragraph 2. Here is why that is listed that way according to api. Mathematica technical manual, online resource at mathworld. Tagged and drill pipe, api and iso standards, api and iso standards for tubulars, api bull 5c2, api bull 5c3, api rp 5a3, api rp 5a5, api rp 5c1, api rp 5c5, api rp 5c6, api tr 5c3, bulletin on performance properties of casing, corrosion resistant alloy, iso 10400, iso 11960, iso 11961, iso 678, iso 679, iso 680, iso 15463, procedures for. Drm is included at the request of the publisher, as it helps them protect their by restricting file sharing. Api bulletin 5c3 1994 is commonly used as the basis for selecting the wall thickness to resist collapse. Four formulas for collapse are given in api 5c3, each valid for a. Api bull 5c2 bulletin on performance properties of. Mar 31, 2016 using annex f of tr 5c3 to calculate the collapse strength at 121. Api bull 5c3 formulas and calculations for casing, tubing drill pipe and line pipe.
It is calculated from formulas 42 and 43 in the api bulletin 5c3. The following collapse formulae provide the user practical tools to estimate collapse strengths of various types of casing and screen. Minimum casing design requirements december 2009 5 corrosionresistant alloys cras are specialty materials designed for use in corrosive environments. The tables below were taken in part from api rp 7g latest.
Formulae for temperature correction factor taken from the exxon casing design manual. The purpose of this bulletin is to show the formulas used in the calculation of the various pipe properties given in api standards, including background. Allowable working pressures listed are nonshock working pressures. The calculation depends on the voided depth of riser, the yield strength of the pipe in some cases and the fabrication tolerances of the pipe. It is important that one pays particular attention to the material and manufacturing standards for the casing and screen specified so that acceptable tolerances are considered and adequate safety factors applied. Api bull 5c3, bulletin on formulas and calculations for casing, tubing, drillpipe and. The minimum collapse pressures given in tables 35and 7 are calculated values determined from equations in api bulletin 5c3. New tubular design ellipse with backup pressure onepetro. Api 5c3 supplement 1 bulletin on formulas and calculations for casing, tubing, drill pipe, and line pipe properties.
Bulletin on formulas and calculations for casing, tubing, drill pipe and line pipe properties. Bulletin on formulas and calculations for casing, tubing, drill. American petroleum institute api 1999 api bull 5c3. Octg are summarized and an analysis of the formulae in api 5c3 is conducted. Api bull 5c3 bulletin on formulas and calculations for casing. Axial strength of the pipe body is calculated from the formula below fy. Bulletin on formulas and calculations for casing, tubing, drill pipe, and. Nonuniform loading affects casing collapse resistance oil. Tan nguyen api specifications, standard and bulletins api bull 5c2, bulletin on performance properties of casing and tubing. Bulletin on formulas and calculations for casing, tubing, drill pipe, and line pipe properties api bulletin 5c3 sixth edition, october 1, 1994 petroleum and natural gas industriesformulae and calculations for casing, tubing, dritt pipe, and line pipe properties american petroleum institute 1220 l street, northwest 11 washington, d. Calculations for joint strength of different api connections is found in api bulletin 5c3. Api rp 5c1 recommended practice for care and use of casing. For imperfections of the api 5c3 collapse formula, the joint apiiso work group isotc67 sc5 wg2b have proposed the current api bulletin 5c3, and a new collapse strength model with manufacturing.
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