Innovative HP/HT Drilling Practices in Malaysia: A Case Study
- Chris Carpenter (JPT Technology Editor)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- April 2014
- Document Type
- Journal Paper
- 110 - 113
- 2014. Society of Petroleum Engineers
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- 110 since 2007
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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 166110, "Successful HP/HT Drilling Through Innovative Practices: Sharing a Case Study of a Deep HP/HT Well," by M. Syazwan, SPE, Y. Yap, SPE, L. Umar, SPE, and M.M. Pepple, SPE, Petronas Carigali, prepared for the 2013 SPE Annual Technical Conference and Exhibition, New Orleans, 30 September-2 October. The paper has not been peer reviewed.
Despite a short 18-month planning time and very limited geological data, the TTD-1 high-pressure/high-temperature (HP/HT) exploration well in East Malaysia’s Block SK was drilled successfully to its technical limit by adopting innovative practices. Various technical challenges were overcome, including an abnormally steep pressure ramp, high overbalance, and high temperatures.
Malaysia has a relatively low number of offshore HP/HT wells drilled by various operators since the 1990s. In the last few years, a series of successful HP/HT discoveries has prompted operators to focus on this area. The major domestic operator began its first HP/HT exploration drilling in 2008.
In the 2012 HP/HT exploration campaign (Fig. 1), the operator of East Malaysia’s SK Block and their partners successfully drilled an HP/HT reservoir at a depth of 4830 m. TTD-1 was the deepest well of its kind drilled by this operator in Malaysia. The undisturbed-pore-pressure estimate was approximately 14,000 psi, with a maximum temperature of 325°F. Significant gas was discovered throughout the target reservoirs.
TTD-1 was the second well drilled in the two-well HP/HT campaign in 2012. The well was spudded on 7 May 2012 and plugged back on 5 November 2012. The well was successfully production tested in both the normal and HP/HT reservoirs.
Well Challenges and Mitigation
This section outlines a number of the issues faced in the drilling of this well. For a full discussion of these issues, please see the complete paper.
Unreliable Offset-Well Data in HP/HT Section. The availability of reliable data up to the start of pressure ramp helped the planning of the non-HP/HT section. For the HP/HT section, there were no data in any of the surrounding wells that could help in modeling the pore pressure and fracture gradient as inputs for well design. The key challenge was in understanding the overpressure mechanism.
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