DEVICE FOR PROTECTING WELLS FROM CORROSION OR DEPOSITS CAUSED BY THE NATURE OF THE FLUID PRODUCED OR LOCATED THEREIN

摘要

PCT No. PCT/FR91/00148 Sec. 371 Date Oct. 22, 1991 Sec. 102(e) Date Oct. 22, 1991 PCT Filed Feb. 22, 1991 PCT Pub. No. WO91/13234 PCT Pub. Date Sep. 5, 1991.Device for protecting wells from the risks of corrosion and deposits due to the nature of the fluid produced or present in the well. It is formed of a steel support casing (2), associated with a composite material production string (3), with a free annular space (6) particularly for the injection of inhibiting agents without stopping working. The string (3) is laid on the casing (2) via a device (4) which may be lowered at the same time as the string (3) and which has openings (13) ensuring the hydraulic continuity of the annular space (6). The device is particularly well adapted to wells conveying fluids which are aggressive with respect to traditional steel casings.