The system includes a fiber-optic wire extending along a length of the well bore a monitoring system.

A chemical treatment is applied and allowed to penetrate the length of the well before production is restarted.

(b) is effective over the entire operating length of the shaft.

Each joint is comprised of a length of screen section (17) which has at least one, axially extending shunt conduit (18) thereon for carrying gravel slurry to different levels within the interval.

Such method utilizes a plurality of spaced hydraulic fractures extending radially outwardly from, and spaced laterally along, a length of a single horizontal wellbore drilled through the reservoir.

An acoustic response from the entire length of the well can be recorded using a single shot of the seismic source.

Generally, numerous beacons will be installed along the length of the reference well, particularly in the important oil field application of drilling steam assisted gravity drainage (SAGD) well pairs.

The aim of the invention is to increase the efficiency of geothermal energy conversion by utilizing the temperature difference over the length of a geothermal well.

(2) Subject to subsection (3), the minimum number of square metres in the total area of the freeing ports on each side of a well on a ship shall be determined by dividing the number of metres in the length of that well by 13.