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Title: Brief: Field measurements of casing tension forces

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 bymore » older design criteria.« less

Authors:
;  [1];  [2]
  1. Mobil E and P Technical Center, Dallas, TX (United States)
  2. Stress Engineering Services, Houston, TX (United States)
Publication Date:
OSTI Identifier:
31897
Resource Type:
Journal Article
Journal Name:
JPT, Journal of Petroleum Technology
Additional Journal Information:
Journal Volume: 47; Journal Issue: 2; Other Information: PBD: Feb 1995
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; OIL WELLS; WELL CASINGS; NATURAL GAS WELLS; STRESS ANALYSIS; CALCULATION METHODS; TENSILE PROPERTIES

Citation Formats

Quigley, M.S., Lewis, D.B., and Boswell, R.S. Brief: Field measurements of casing tension forces. United States: N. p., 1995. Web.
Quigley, M.S., Lewis, D.B., & Boswell, R.S. Brief: Field measurements of casing tension forces. United States.
Quigley, M.S., Lewis, D.B., and Boswell, R.S. Wed . "Brief: Field measurements of casing tension forces". United States.
@article{osti_31897,
title = {Brief: Field measurements of casing tension forces},
author = {Quigley, M.S. and Lewis, D.B. and Boswell, R.S.},
abstractNote = {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.},
doi = {},
journal = {JPT, Journal of Petroleum Technology},
number = 2,
volume = 47,
place = {United States},
year = {1995},
month = {2}
}