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Search Petrowiki: Thermal loads on casing AND tubing strings
...Thermal loads on ...casing and ...tubing strings To evaluate a given ...
To evaluate a given casing design, a set of loads is necessary. Casing loads result from running the casing, cementing the casing, subsequent drilling operations, production and well workover operations. Temperature changes and resulting thermal expansion loads are induced in casing by drilling, production, and workovers, and these loads might cause buckling (bending stress) loads in uncemented intervals. In shallow normal-pressured wells, temperature will typically have a secondary effect on tubular design. In other situations, loads induced by temperature can be the governing criteria in the design.
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...Mechanical loads on ...casing and ...tubing strings To evaluate a given ...
To evaluate a given casing design, a set of loads is necessary. Casing loads result from running the casing, cementing the casing, subsequent drilling operations, production and well workover operations. Mechanical loads are associated with casing hanging weight, shock loads during running, packer loads during production and workovers, and hanger loads. In tubing and over the free length of the casing above top-of-cement (TOC), changes in temperatures and pressures will have the largest effect on the ballooning and temperature load components. The incremental forces, because of these effects, are given here.
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...Internal pressure loads on ...casing and ...tubing strings To evaluate a given ...
To evaluate a given casing design, a set of loads is necessary. Casing loads result from running the casing, cementing the casing, subsequent drilling operations, production and well workover operations. Internal pressure loads result from fluids within the casing and are modeled with pressure distributions. Fluid gradient * 1.16 Collapse: gas migration (subsea wells) * 1.17 Collapse: salt loads * 1.18 Annulur pressure buildup * 2 References * 3 See also * 4 Noteworthy papers in OnePetro * 5 External links * 6 General references Pressure distributions are typically used to model the internal pressures. These pressure distributions are discussed next.
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- Well Drilling > Pressure Management > Well control (1.00)
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- Well Drilling > Casing and Cementing > Casing design (1.00)
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...External pressure loads on ...casing and ...tubing strings To evaluate a given ...
To evaluate a given casing design, a set of loads is necessary. Casing loads result from running the casing, cementing the casing, subsequent drilling operations, production and well workover operations. External pressure loads are produced by cement and fluids outside the casing, which can be modeled by pressure distributions. Pressure distributions are typically used to model the external pressures in cemented intervals. These pressure distributions are discussed next.
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...Casing and ...tubing buckling As installed, ...casing usually hangs straight down in vertical wells or lays on the low side of the hole in deviated wells...
As installed, casing usually hangs straight down in vertical wells or lays on the low side of the hole in deviated wells. Thermal or pressure loads might produce compressive loads, and if these loads are sufficiently high, the initial configuration will become unstable. However, because the tubing is confined within open hole or casing, the tubing can deform into another stable configuration, usually a helical or coil shape in a vertical wellbore or a lateral S-shaped configuration in a deviated hole. These new equilibrium configurations are what we mean when we talk about buckling incasing design. In contrast, conventional mechanical engineering design considers buckling in terms of stability (i.e., the prediction of the critical load at which the original configuration becomes unstable).
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...As installed, casing usually hangs straight down in vertical wells or lays on the low side of the hole in deviated wells... Thermal or pressure ...loads might produce compressive ...
As installed, casing usually hangs straight down in vertical wells or lays on the low side of the hole in deviated wells. Thermal or pressure loads might produce compressive loads, and if these loads are sufficiently high, the initial configuration will become unstable. However, because the tubing is confined within open hole or casing, the tubing can deform into another stable configuration, usually a helical or coil shape in a vertical wellbore or a lateral S-shaped configuration in a deviated hole. These new equilibrium configurations are what we mean when we talk about buckling in casing design. In contrast, conventional mechanical engineering design considers buckling in terms of stability (i.e., the prediction of the critical load at which the original configuration becomes unstable).
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...Casing design To design a ...casing string, one must have knowledge of: * Purpose of the well * Geological cross section * Available... casing and bit sizes * Cementing and drilling practices * Rig performance * Safety and environmental re...
To arrive at the optimal solution, the design engineer must consider casing as a part of a whole drilling system. A brief description of the elements involved in the design process is presented next. The engineer responsible for developing the well plan and casing design is faced with a number of tasks that can be briefly characterized. This will help prevent exceeding the design envelope by application of loads not considered in the original design. While the intention is to provide reliable well construction at a minimum cost, at times failures occur.
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...PEH:Casing Design Publication Information Petroleum Engineering Handbook Larry W. Lake, Editor-in-Chief...neering Robert F. Mitchell, Editor Copyright 2006, Society of Petroleum Engineers Chapter 7 - Casing Design By R.F. Mitchell, Landmark Graphics Pgs. 287-342 ISBN 978-1-55563-114-7 Get permission... for reuse Casing and ...
Casing is the major structural component of a well. Casing is needed to maintain borehole stability, prevent contamination of water sands, isolate water from producing formations, and control well pressures during drilling, production, and workover operations. Casing provides locations for the installation of blowout preventers, wellhead equipment, production packers, and production tubing. The cost of casing is a major part of the overall well cost, so selection of casing size, grade, connectors, and setting depth is a primary engineering and economic consideration. Casing Strings There are six basic types of casing strings.
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...Risk-based casing design Oilfield tubulars have been traditionally designed using a deterministic working stress de...d In all design procedures, a primary goal is to ensure that the total load effect of the applied loads is lower than the strength of the tubular to withstand that particular load effect, given the uncer...esistance in response to the load effect, Q. Working stress design (WSD) WSD is the conventional casing design procedure, that is, the familiar deterministic approach to the design of oilfield tubulars. ...
Reliability-based approaches are probabilistic in nature and explicitly identify all the design variables and parameters that determine the load effect and strength of the structure. Moreover, they use a limit-states approach to the design of tubulars, rather than elasticity-based initial yield criteria to predict structural failure. Such probabilistic design methodologies allow either the computation of the probability of failure (Pf) of a given structure or the design of a structure that meets a target probability of failure. Reliability-based techniques have been formally applied to the design of load-bearing structures in several disciplines. However, their application to the design of oilfield tubulars is relatively new. Two different reliability-based approaches have been considered: the more fundamental quantitative risk assessment (QRA) approach and the more easily applied load and resistance factor design (LRFD) format. Comparison of SF to the estimated design reliability offers a reliability-based interpretation of WSD and gives insight into the design reliabilities implicit in WSD.
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...ngineering Robert F. Mitchell, Editor Copyright 2006, Society of Petroleum Engineers Chapter 7 - Casing Design By R.F. Mitchell, Landmark Graphics ISBN 978-1-55563-114-7 Get permission for reuse ...Casing and ...tubing strings are the main parts of the well construction. All wells drilled for the purpose of oil/gas productio...
Casing and tubing strings are the main parts of the well construction. All wells drilled for the purpose of oil/gas production (or injecting materials into underground formations) must be cased with material with sufficient strength and functionality. Therefore, this chapter provides the basic knowledge for practical casing and tubing strength evaluation and design. Casing is the major structural component of a well. Casing is needed to maintain borehole stability, prevent contamination of water sands, isolate water from producing formations, and control well pressures during drilling, production, and workover operations. Casing provides locations for the installation of blowout preventers, wellhead equipment, production packers, and production tubing. The cost of casing is a major part of the overall well cost, so selection of casing size, grade, connectors, and setting depth is a primary engineering and economic consideration. Tubing is the conduit through which oil and gas are ...
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