Compressible Fluids Mitigation Effect Research in Deepwater Oil and Gas Well

Abstract:

During well drilling and petroleum production in deepwater, wellhole temperature changes will cause annular pressure buildup (APB), which is of great danger to casing strings. Based on previous research results, this paper introduces the traditional bulk modulus elasticity calculation method of mixed gas and liquid into annulus fluids, to predict annular pressure buildup by thermal when gas mixture is used. Pressure mitigation effect of common used compressible fluid is investigated and compared with experiment results from references. Through engineering case, the changing rule of mixed fluid bulk modulus versus gas volume and impact of mixed fluid volume on annular pressure are calculated. It shows that bulk modulus obtained in this paper has small errors compared with simulation experiment. But the errors are acceptable in engineering environment. And so, annular pressures needed in a well can be predicted and controlled precisely by adjusting gas volume as shown in examples.

• Periodical: Advanced Materials Research (Volumes 734-737)
• Pages: 1165-1170
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.734-737.1165
• Online since: August 2013
• Authors: Xuan Zhuo Han, Bao Kui Gao, Hong Qiang Zhang, Xing Qin, Wei Wang
• Keywords: Annular Pressure Buildup (APB), Compressible Fluid, Deepwater, Fluid Bulk Modulus

References

[1] Richard F. Vargo Jr, Mike Payne. Practical and Successful Prevention of Annular Pressure Buildup on the Marlin Project, SPE77473, 2002.

DOI: 10.2118/77473-ms

[2] P.D. Pattillo, B.W. Cocales and S.C. Morey, Analysis of an Annular Pressure Buildup Failure during Drill Ahead, SPE 89775, 2004.

DOI: 10.2118/89775-ms

[3] Baokui Gao. High temperature cause casing additional load practical calculation model[J]. Oil drilling & Production technology, 2002. 24( 1) : 8~10

[4] A.MacEachran, A.J. Adams, Impact on Casing Design of Thermal Expansion of Fluids in Confined Annuli, SPE/IADC 21911, 1991.

DOI: 10.2118/21911-pa

[5] Maharaj G. Thermal Well Casing Failure Analysis. SPE36143,1996.

[6] Oudeman P, Kerem M. Transient Behavior of Annular Pressure Build -up in HP/HT Wells[ A] . SPE 88735, 2004. 2~ 4.

DOI: 10.2118/88735-ms

[7] Neil Sultan, Jean-Baptiste Faget, Mikkel Fjeldheim, and Jean-Claude Sinet.: Real-Time Casing Annulus Pressure Monitoring in a Subsea HPHT Exploration Well, OTC 19286, 5–8 May 2008.

DOI: 10.4043/19286-ms

[8] Loder, T , Evans, J.H. and Griffith, J.E.: Prediction and Effective Preventative Solution for Annular Fluid Pressure Buildup on Subsea Completed Wells-Case Study, SPE 84270, presented at SPE Annual Technical Conference and Exhibition, Denver, CO(October 5-8,2003)

DOI: 10.2118/84270-ms

[9] Ridong Bao. Gas oil pipe flow of sound propagation characteristics. Journal of Shenyang institute of chemical technology, 2008.22(3) :238～242.

[10] Zhen Zhang，Baokui Gao. Study on temperature bearing of free casing segment. West-China Exploration Engineering, 2009,7:53—55.