Development of Degradable Seal Elements for Fully Degradable Frac Plugs
- Takeo Takahashi (Kureha Corporation) | Shinya Takahashi (Kureha Corporation) | Masayuki Okura (Kureha Corporation)
- Document ID
- Offshore Technology Conference
- Offshore Technology Conference Asia, 22-25 March, Kuala Lumpur, Malaysia
- Publication Date
- Document Type
- Conference Paper
- 2016. Offshore Technology Conference
- 2 Well completion, 7.2.1 Risk, Uncertainty and Risk Assessment, 3 Production and Well Operations, 7.2 Risk Management and Decision-Making, 7 Management and Information, 2.5 Hydraulic Fracturing
- Frac Plugs, Milling out, Degradable, Sealing Element
- 3 in the last 30 days
- 186 since 2007
- Show more detail
- View rights & permissions
Demand for hydrocarbons is continuing to grow, leading to an increase in the stage count of hydraulic fracturing in unconventional reservoirs. The plug-and-perf system is a typical stimulation method that uses frac plugs for zone isolation. Conventionally, the plugs must be milled out to recover the flow path for hydrocarbons after fracturing is complete. Fully degradable frac plugs would eliminate the need for milling out, and this in turn allows for longer wellbores in the lateral direction, lower costs, and reduced risk in well completion. A key material for fully degradable frac plugs is a sufficiently degradable rubber with good sealing properties for the seal elements of the plugs. This paper presents the fundamental properties of degradable rubbers developed in a comprehensive materials study. The degradation behaviors of the degradable rubbers were investigated under various temperature and fluid media conditions. The mechanical strength was compared with that of conventional nitrile rubber. Nonlinear, three-dimensional multi-body contact analysis and qualification testing were integrated to estimate the sealing performance of seal elements made of the degradable rubbers.
|File Size||1 MB||Number of Pages||8|
Okura, M., Takahashi, S., Kobayashi, T., Saijo, H., and Takahashi, T. 2015. Improvement of Impact Strength of Polyglycolic Acid for Self-Degradable Tools for Low-Temperature Wells. Presented at the SPE Middle East Unconventional Resources Conference and Exhibition, Muscat, Oman, 26–28 January. SPE-172969-MS.
Takahashi, S., Okura, M., Kobayashi, T., Saijo, H., and Takahashi, T. 2015. Filler-Reinforced Poly(Glycolic Acid) for Degradable Frac Balls Under High-Pressure Operation. In Mechanics of Composite and Multi-functional Materials, Volume 7, Eds. Ralph, C., Silberstein, M., Thake, P. R., and Singh, R. pp. 181–189, Springer.
Tompkins, R., Smith, N.Wellhofer, B., Yuyi, S.Rhodes, B., and Stivers, P. 2013. Factors Affecting Effective Millout of Multistage Fracturing Sleeves in Horizontal Wellbores. Presented at the SPE/ICoTA Coiled Tubing & Well Intervention Conference & Exhibition, The Woodlands, Texas, 26–27 March. SPE-163899.