Improvements in producing fluids from reservoirs

摘要

A method of producing fluid from a hydrocarbon reservoir is described in which, in particular embodiments, a production tubing 7 section is provided in a well and is arranged to contain therein a flow of production fluid. A fluid is circulated adjacent the production fluid to prevent the production fluid from falling below a predetermined temperature and prevents the appearance of wax or hydrates. The circulating fluid may be a power fluid used to drive a pump 2.