Fischer tropsch method for offshore production risers or oil and gas wells

摘要

A method and an apparatus is disclosed that uses a gas lift tubing arrangement to produce synthetic hydrocarbon related products. Using the Fischer Tropsch process as an example, the tubing is packed with a suitable catalyst and then hydrogen and carbon monoxide are injected into the top of the tubing in a fashion similar to a gas lift process. As the gases travel past the catalyst, synthetic hydrocarbons are formed and heat is rejected. The synthetic hydrocarbons and water flow out of the bottom of the tubing and travel up the annulus to the surface. In some embodiments, this process is carried out in a producing well or a in producing riser. In a producing well or a producing riser, the production from the well which flows up the annulus cools the synthetic hydrocarbon derived products. In additional and alternate embodiments, this process can be used in non-flowing wells.

主权项

1. An apparatus for producing synthetic hydrocarbons comprising:
a marine riser, wherein the marine riser is suspended in a body of water; a tube configured to insert into the top of the marine riser, wherein a Fischer-Tropsch catalyst is comprised inside the tube, and wherein the top of the tube is configured to receive hydrogen and carbon monoxide such that contact of the hydrogen and carbon monoxide with the Fischer-Tropsch catalyst produces synthetic hydrocarbons; and an annulus configured to receive the produced synthetic hydrocarbons, wherein heat generated by contact of the hydrogen and carbon monoxide with the Fischer-Tropsch catalyst is rejected into the body of water during production of the synthetic hydrocarbons from the annulus.