gas hydrate - CCOP

Natural
gas
Free gas layer
Figure 5. Conceptual develop method pf natural gas hydrate.
Outline the engineering practice for hydrate production
Offshore hydrates are broadly distributed in deep water so it is viable to utilize offshore
engineering, especially deepwater engineering, to fulfill the hydrate production in a costeffective
way. The outline is as follows:
1) To set the heat power unit, chemical injection unit and main control station to provide
support for hydrate production and realize the real-time control and monitor the
underwater natural gas hydrate production, which also ensures the safety of the
production, as described in Figure 6.
2) To inject heat and chemicals safely through the upside supply system and downhole
injection system into the hydrate reservoir according to the requirement of dissociation
rate.
3) Both platforms completed well and subsea completed well can be utilized, meaning
either dry tree or wet tree is free.
4) Utilize deepwater engineering technology and experience, such as deepwater floating
platforms (TLP, SPAR , FPS, FPSO) and subsea production technology;
5) The key is to establish series processing of the drilling technology, well completion,
and real time control and monitoring technology of production safety, such as low
temperature mud, well control of a natural gas hydrate well, hazard prevention and
environmental protection. The conceptual development plan for the deepwater natural
gas hydrate is given in Figure 6.
6) The free gas derived from the dissociated natural gas hydrate is transported to the
subsea installed production system through the wells. Then the produced gas from
different wells is collected together in subsea manifolds and sent directly to the host
surface facility or the onshore processing factory through long subsea pipelines, either
directly or boosted by subsea installed wet compressors.
New Energy Resources in the CCOP Region - Gas Hydrates and Coalbed Methane 69