دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a casing string with joints of various collapse resistance, internal yield strength, and tensile strength, designed for various depths in a specific well to best withstand the conditions of that well. In deep wens, high tensile strength is required in the top casing joints to carry the load, whereas high collapse resistance and internal yield strength are needed in the bottom joints. In the middle of the casing, average quality is usually sufficient. The most suitable combination of types and weights of pipe helps to ensure efficient production at a minimum cost.

n: A casing string made up of various different grades or weights of casing (sometimes referred to as a tapered string).

n: the maximum stress a metal, subjected to compression, can withstand without a predefined amount of permanent deformation.

n: most present-day seamless drill pipe falls into one of four American Petroleum Institute (API) grades. (1) E-75, with a minimum yield strength of 75,000 psi (517,125 kilopascals-kPa),a maximum yield strength of 105,000 psi (723,975 kPa),and a minimum tensile strength of 100,000 psi (689,500 kPa);(2) X- 95, with a minimum yield strength of 95,000 psi (655,025 kPa),a maximum yield strength of 125,000 psi (861,875 kPa),and a minimum tensile strength of 105,000 psi (723,975 kPa);(3) G-105, with a minimum yield strength of 105,000 psi (723,975 kPa),a maximum yield strength of 135,000 psi (930,825 kPa),and a minimum tensile strength of 115,000 psi (792,925 kPa);and S-135, with a minimum yield strength of 135,000 psi (930,825 kPa),a maximum yield strength of 165,000 psi (1,137,675 kPa),and a minimum tensile strength of 145,000 psi (999,775 kPa). V-150 is a non- API, but higher strength, grade. It has a minimum yield strength and a tensile strength of 150,000 psi (1,034,250 kPa).

n: the stress level of tubular drill pipe above which permanent deformation will occur.

n: The sulfur prevention casing made of C or L steel grade pipe.

n: A kind of standard that represent the hardness of material.Its code is HR.


hardness measuring scales relating penetration of a small indentation ball to ultimate yield strength, used to establish steel harness. Rockwell C scale is used in determination of metal hardness limit to control stress chloride cracking.

n: the greatest longitudinal stress that a metal can bear without tearing apart. A metals tensile strength is greater than its yield strength.

the greatest lengthwise stress that a substance can bear without failure.

materials that change the relationship between solids and viscosity of a fluid to lower the gel strength, yield point, yield strength or viscosity as it affected by solids.

n: the amount of twisting force that a pipe can withstand before twisting off.

n: a measure of the force needed to deform tubular goods to the extent that they are permanently distorted.

The stress in which the stress-strain relation of material changing.