3D Geomechanical Evaluation of Jetting Operations for Producing Hydrate Chimneys in the Sea of Japan
- Pengwei Zhang (Schlumberger) | Kaibin Qiu (Schlumberger) | Terao Yoshihiro (Japan Petroleum Exploration Company Limited) | Koji Kashihara (Japan Petroleum Exploration Company Limited)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- June 2020
- Document Type
- Journal Paper
- 279 - 296
- 2020.Society of Petroleum Engineers
- gas hydrate, reservoir deformation, plastic strain, reservoir geomechanics, wellbore stability
- 24 in the last 30 days
- 117 since 2007
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The common occurrence of massive methane hydrate in numerous gas-chimney structures, located in Joetsu Basin, Sea of Japan, has stimulated great interest in academia, industry, and national institutes to develop technologies that produce the potential energy resource. Unlike other deep methane-hydrate deposits in formations a few hundred meters below the seafloor (mBSF), the hydrate-chimney structures are at the seafloor or up to 100 mBSF; therefore, previously field-tested production methods such as depressurization are not applicable. In this work, we proposed a new potential production method of jetting from the openhole section of a wellbore to excavate the hydrate bearing. However, jetting will create large empty chambers below the seafloor and could possibly jeopardize the stability and safety of wellheads and the production facility on the seafloor.
This paper presents a 3D geomechanical simulation study to evaluate the feasibility of the jetting method to produce methane from the hydrate chimneys in the Sea of Japan. In this work, we constructed three types of 3D geomechanical models to represent three shallow-methane-hydrate-inhabitation types (chunk, laminated, and dispersed) by using data from various sources. Dynamic numerical simulation using a 3D finite-element simulator was conducted to simulate the jetting process to excavate a 16-m-diameter chamber from the bottom of the borehole (approximately 100 mBSF) progressively up to the bottom of the conductor of the wellbore, approximately 10 mBSF.
The numerical simulation shows that jetting is likely to be feasible because all simulation cases resulted in tolerable vertical displacement and equivalent plastic strain under ideal conditions [e.g., lateral homogeneous formation, constant chamber pressure (equal to formation pore pressure), and blowout-preventer (BOP) weight of 20 tons]. In these cases, the plastic zone only extends to a limited area (10–20 cm) from the sidewall. Additional complexities were considered in the numerical simulation to evaluate the operational risks during actual jetting operations, such as faulting, fluctuation of chamber pressure, and change of BOP weights.
This numerical simulation evaluated potential risks related to jetting operations of hydrate chimneys in the Sea of Japan and provided critical information for the engineering design of the proposed field test of jetting operations to produce this valuable resource in the Sea of Japan.
|File Size||12 MB||Number of Pages||18|
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