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01080 COILED TUBING PERFORMANCE EVALUATION FOR SOUR SERVICE UNDER VARIABLE LOADING CONDITIONS

Picture for 01080 COILED TUBING PERFORMANCE EVALUATION
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Product Number: 51300-01080-SG
ISBN: 01080 2001 CP
Author: Graham Wilde, Bernie Luft, lwona Smuga-Otto, Jarek Nowinka
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Coiled tubing (CT) has been used extensively for underbalanced drilling in non-sour applications with great success; however, attempts to utilize it for sour service produced frequent failures due to tubing environmental cracking. Specific operational conditions of CT, involving a combination of cyclic plastic strain of CT material (associated with travel on/off a reel) and periodic exposure to sour environments, typically result in a significantly poorer CT performance in comparison with non-sour applications, or with sour service at stresses below yield. An experimental program was implemented using Slow Strain Rate Test (SSRT) to evaluate suitability of CT candidates for sour underbalanced drilling. Out of a variety of standard tests for stress corrosion cracking (SCC) resistance, this test was chosen because it assesses dynamic cracking in the plastic region, accounting for synergy effects between plastic strain and exposure to sour environment.
Coiled tubing (CT) has been used extensively for underbalanced drilling in non-sour applications with great success; however, attempts to utilize it for sour service produced frequent failures due to tubing environmental cracking. Specific operational conditions of CT, involving a combination of cyclic plastic strain of CT material (associated with travel on/off a reel) and periodic exposure to sour environments, typically result in a significantly poorer CT performance in comparison with non-sour applications, or with sour service at stresses below yield. An experimental program was implemented using Slow Strain Rate Test (SSRT) to evaluate suitability of CT candidates for sour underbalanced drilling. Out of a variety of standard tests for stress corrosion cracking (SCC) resistance, this test was chosen because it assesses dynamic cracking in the plastic region, accounting for synergy effects between plastic strain and exposure to sour environment.
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