Connection Performance Evaluation for Casing-Drilling Application
- Daniel Hannahs (Grant Prideco) | Qing Lu (Grant Prideco) | Jiang Wu (Chevron ETC) | Steve Langford (Grant Prideco)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- June 2008
- Document Type
- Journal Paper
- 184 - 189
- 2008. Society of Petroleum Engineers
- 4.6 Natural Gas, 1.10 Drilling Equipment, 1.6 Drilling Operations, 1.14.1 Casing Design, 2.2.2 Perforating
- 2 in the last 30 days
- 717 since 2007
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With the evolution of casing-drilling technology, connections are subjected to increasingly stringent well conditions. These conditions include higher pressures, higher temperatures, and higher mechanical loads for longer drilling periods. As a result, the performance of the connector under these conditions is of increasing concern. Most recent casing connection evaluation test programs are based on International Standards Organization (ISO) 13679 (2002) requirements. However, API RP7 (1998) is the dominant testing program for drill stem applications. Because casing-drilling applications combine drilling and casing concerns, a new test protocol is required to adequately characterize connection performance (Hegler et al. 2004).
A better understanding of how connection tolerances impact connection performance under combinations of static and dynamic loading aids in connector selection and allows the technology to be used in broader casing-drilling applications. As part of the proposed test program, the static and dynamic connector performances are evaluated individually to benchmark the design. Based on these evaluations, additional testing was conducted to determine the connector static capacity after dynamic loading. This testing demonstrates the connector performance when used in casing-drilling applications.
This proposed testing protocol can be used to better define connector performance limits when used in casing-drilling applications leading to increased operational safety and lower overall risks. This paper includes results, observations, and conclusions from a subject test conducted in accordance with the proposed testing protocol on a 9-5/8-inch 53.50 ppf P-110 casing-drilling connector.
The objective of this test protocol is to evaluate connection performance for casing-drilling applications. Tests were conducted in the following four phases, each with distinctive goals:
Phase I: Design Selection
Phase II: Fatigue to Failure Test
Phase III: Static-Capacity Test
Phase IV: Post-Fatigue ISO Series B Test
Phase I determined the preferred connector design and thread compound combination. All test specimens were threaded to nominal tolerances, fatigue tested based on expected field conditions, and subsequently capped-end pressure tested. Two different connector designs were fatigue tested under identical loading conditions to determine the preferred connector design. In addition, two specimens of one-connector design were tested with different thread compounds to determine the preferred thread compound. After completing the fatigue testing, the preferred design specimen was tested in accordance with ISO 13679 CAL II Series B test procedures.
Phase II generated the SN curve for preferred connection design based on ISO 13679 specimen tolerance combinations. Three ISO configurations, with three specimens of each configuration, were fatigued to failure to determine the SN curve for each specimen configuration.
Phase III verified the static Service Load Envelope (SLE) of the preferred connection. The same ISO specimen configurations tested in Phase II were tested in accordance with the ISO 13679 CAL II Series B test procedure.
Phase IV included post-fatigue ISO 13679 Series B testing. One specimen was machined for each of the configurations used in Phase II. Each specimen was fatigue tested to a predetermined number of cycles at a specified stress level. The fatigue test was followed by an ISO 13679 CAL II Series B test to verify the connector performance after dynamic loading.
|File Size||1 MB||Number of Pages||6|
Bailey, A.G. et al. 2006. Evaluationof a Casing Drilling Connection Subjected to Fatigue and Combined LoadTesting. Paper OTC 18373 presented at the Offshore Technology Conference,Houston, 1-4 May. doi:10.4043/18373-MS
Hegler, M. et al. 2004. Methodologyfor Testing Casing Drilling Connections for High Pressure/High TemperatureApplication. Paper OTC 16563 presented at the Offshore TechnologyConference, Houston, 3-6 May. doi:10.4043/16563-MS
ISO 13679, Petroleum and Natural Gas Industries—Procedures for TestingCasing and Tubing Connections, first edition, 2002. Geneva, Switzerland:International Organization for Standardization.
Long, J.R. 2003. Documentation and User's Manual for Resonant BendingFatigue Machine. Houston: Stress Engineering Services.
Lu, Q., Prideco, G., Wu, J., and Hannahs, D. 2007. Connection Qualification forCasing-Drilling Application. Paper SPE 105432 presented at SPE/IADCDrilling Conference and Exhibition, Amsterdam, 20-22 February.doi:10.2118/105432-MS
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