Energy Citations Database

Bibliographic Citation

 
Document
For copies of Journal Articles, please contact the Publisher or your local public or university library and refer to the information in the Resource Relation field.
For copies of other documents, please see the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or Document Availability.
Title Brief: Field measurements of casing tension forces
Creator/Author Quigley, M.S. ; Lewis, D.B. [Mobil E and P Technical Center, Dallas, TX (United States)] ; Boswell, R.S. [Stress Engineering Services, Houston, TX (United States)]
Publication Date1995 Feb 01
OSTI IdentifierOSTI ID: 31897
Other Number(s)Journal ID: JPTJAM; ISSN 0149-2136
Resource TypeJournal Article
Resource RelationJournal: JPT, Journal of Petroleum Technology; Journal Volume: 47; Journal Issue: 2; Other Information: PBD: Feb 1995
Subject02 PETROLEUM ;03 NATURAL GAS; OIL WELLS; WELL CASINGS; NATURAL GAS WELLS; STRESS ANALYSIS; CALCULATION METHODS; TENSILE PROPERTIES
Description/Abstract Tension forces acting on individual casing joints were accurately measured during installation of 10,158 ft of 9 5/8-in. {times} 47-lbm/ft casing and 11,960 ft of 11 7/8-in. {times} 71.8-lbm/ft casing. A unique casing load table (CLT) weighed the casing string after the addition of each casing joint. Strain gauges attached inside the pin ends of instrumented casing joints (ICJ`s) directly measured tension force on those joints. A high-speed computer data-acquisition system (DAS) automatically recorded data from all the sensors. Several casing joints were intentionally subjected to extreme deceleration to determine upper limits for dynamic tension forces. Data from these tests clearly show effects of wellbore friction and casing handling conditions. In every case, tension forces in the casing during maximum deceleration were considerably less than expected. In some cases, the highest tension forces occurred when the casing lifted out of the slips. Peak tension forces caused by setting the casing slips were typically no more than 5% greater than tension forces in the casing at rest. This dynamic amplification was far less than the 60% value used in the previous casing design method. Reducing the safety factor for installation loads has permitted use of lighter, less-expensive casing than dictated by older design criteria.
Country of PublicationUnited States
LanguageEnglish
FormatSize: pp. 127-128; Other: PL:
System Entry Date2004 Sep 27

Top