Casing serves numerous purposes during the drilling and production history of oil and gas wells, these include. Drill string design design means determination of length, weight, grades of drill pipe to be used during drilling, coring or any other operation depends on. The plot is for the burst case of tubing leak acting on the production casing. This standard shall become effective on the date printed on the cover but may be used voluntarily from the date of publication. Guidelines for the design of buried steel pipe july 2001 page 1.
Improved burst model for casing and tubing design ntnu open. Casing and tubing design for burst are performed by requiring a safety margin against yield under internal overpressure. Stove pipe marine conductor or foundation pile for offshore rigs. Casing design design criteria tensile force tensile forces in casings originate from its weight, and shock loading. Internal yield strength per cement manual 14,520 psi. We present the complete version of this book in txt, doc, pdf. 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 casing string design program for windows, casing2, has been developed jointly by lone star steel company and maurer engineering inc. The casing designer determines the internal pressure profile and external pressure profile for each load case. If you are not an engineer, and many casing strings are designed by nonengineers, do not be discouraged by the many equations you see. Pdf relevant information on oil and gas casing design.
The bar notations in the margins identify parts of this standard that have been changed from the previous api edition. Ysmax is the specified maximum yield strength, in megapascals thousand pounds per square inch. If you are searching for the book casing and tubing design manual in pdf format, in that case you come on to the loyal website. Example hole and string sizes in hole size pipe size 36 26. Api specification 5ct eighth edition, july 1, 2005 iso. One is modeled with a tubing leak near the surface with the shutin tubing pressure added to the packer fluid weight as an internal load. There are two main design cases for internal yield pressure of production casing. If the net resultant load is positive, then it is called as burst and if its negative then its called as collapse casing design guide. Run to prevent wash out of unconsolidated surface formation.
Pdf casing drilling is an alternative option to conventional drilling and uses standard oilfield casing instead of drillstring. It is, if you will, a recipe book for basic casing design. It does go into some detail at times, but overall its purpose is to actually teach an understanding of basic casing design. As illustrated, there is no risk of casing failure because the safety factor of both the axial. Project to develop and evaluate coiledtubing and slimhole. Guidelines for the design of buried steel pipe july 2001. Rotation of drillpipe during the drilling process creates. The shutin tubing pressure is estimated from the bottom hole pressure minus the weight of the gas in the tubing. The american lifelines alliance ala was formed in 1998 under a cooperative agreement between the american society of civil engineers asce and the federal emergency management agency fema. Pdf casing design is an important task in oil and gas well design.
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