Temperature Effect on HP Gas Well Integrity: Thermal Wellhead Growth Challenges and Solutions
- Khalid Almulhem (Saudi Aramco) | Zoran Mrsic (Saudi Aramco) | Mohammed Thuwaibi (Saudi Aramco) | Rotimi Adesegha (Saudi Aramco)
- Document ID
- Society of Petroleum Engineers
- SPE Asia Pacific Oil & Gas Conference and Exhibition, 17-19 November, Virtual
- Publication Date
- Document Type
- Conference Paper
- 2020. Society of Petroleum Engineers
- 2.10 Well Integrity, 2 Well completion, 2.1.3 Completion Equipment
- Thermal Growth, Wellhead Growth, High pressure, Well Integrity, HPHT
- 21 in the last 30 days
- 21 since 2007
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Determined efforts are being exerted to shore up the integrity of high-pressure high temperature (HPHT) gas wells, which includes studying all observed integrity failures and adjusting practices to prevent potential failures from reoccurring. In high-pressure high-temperature gas wells, casing thermal expansion is a challenge that should be considered in order to maintain the integrity of the well and surface equipment. The objective of the paper is to describe observed growth in a HP gas wells in relation to the wellhead temperature and how it behaves after cycling the well and how it can affect the annuli pressures.
As methodology, two elements varying during shutdowns were studied thoroughly to determine the extent of the impact they may have on the integrity of HP gas wells. These elements are pressure and temperature. While the linear increase of the wellhead growth with increasing temperature was apparent, the subsequent actions of shutting in the well to cool down and then reopening it led to further deterioration of the cement and the wellhead growth increased even further. The engineering solutions and stress analysis at surface facilities is designed to overcome the growth allowance.
The main observation looks at the temperature element and its effect on well integrity in that it analyses the temperature impact on the well’s tubulars and links it to the stresses caused to casing cement and the resulting wellhead growth. Study will also provide recommendations on maintaining well integrity and avoiding any further deterioration. The temperature impact was also observed in one of the wells after it was shut in and wellhead sensors were left to record shut-in wellhead pressure and temperature for about 14 hours. This gave a reasonable indication of how fast it takes for the wellhead to cool down to ambient conditions. In the subject well, the wellhead temperature dropped by 50% in about 2 hours.
As result of the study, in detail reasons for increased wellhead growth in HPHT gas wells and how to avoid it. It also gives recommendations on maintaining well integrity and reducing the impact of full contraction of the well’s tubulars during cooling; such as maintaining wells on constant production, minimizing open and shut-in cycling, and reducing the shut-in time duration.
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Aasen, J. A. and Aadnoy, B. S. 2004. Multistring Analysis of Well Growth. Paper presented at the IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition, Kuala Lumpur, Malaysia, 13-15 September. SPE-88024-MS. 10.2118/88024-MS.
Baokui, G., Jingwei, R., and Liang, G. 2016. Study on Wellhead Growth in Deep Well. Third International Conference on Mechanics and Mechatronics Research, MATEC Web Conference (10): 36–44. PETSOC-06-10-03. 10.1051/matecconf/20167706003
Drilling Formulas. 2016. Tubing Length Change Due to Ballooning, July 2016, http://www.drillingformulas.com/tubing-length-change-due-to-ballooningL (accessed July 2020).
Liang, J. Q. 2012.Casing Thermal Stress and Wellhead Growth Behavior Analysis. Paper presented at SPE Asia Pacific Oil and Gas Conference and Exhibition, Perth, Australia, 22-24 October. SPE-157977. 10.2118/SPE-19241-MS.
McCabe, A. C. 1989. Well Vertical Movement of Platform Wells. Paper presented at Offshore Europe 89, Aberdeen, United Kingdom, 5-8 September. SPE-19241-MS. 10.2118/SPE-19241-MS.