초록 ▼

A screen assembly (60) comprises a base pipe (62) having perforated and nonperforated sections (66, 68), ribs (70) circumferentially spaced therearound and a filter medium (84) positioned around the ribs (70) having voids (92, 94) therethrough. The screen assembly (60) includes a slurry passageway (

A screen assembly (60) comprises a base pipe (62) having perforated and nonperforated sections (66, 68), ribs (70) circumferentially spaced therearound and a filter medium (84) positioned around the ribs (70) having voids (92, 94) therethrough. The screen assembly (60) includes a slurry passageway (98) defined by the nonperforated section (68) of the base pipe (62), two of the ribs (70) and the portion (100) of the filter medium (84) that is circumferentially aligned with the nonperforated section (68). This portion (100) of the filter medium (84) has a filler material (96) disposed within the voids (92, 94) to create a fluid tight seal for a fluid slurry. The fluid slurry is discharged from the screen assembly (60) to a plurality of levels of the interval through exit ports (106) in a plurality of manifolds (102) when the screen assembly (60) is in an operable position.

대표청구항 ▼

A screen assembly (60) comprises a base pipe (62) having perforated and nonperforated sections (66, 68), ribs (70) circumferentially spaced therearound and a filter medium (84) positioned around the ribs (70) having voids (92, 94) therethrough. The screen assembly (60) includes a slurry passageway (

A screen assembly (60) comprises a base pipe (62) having perforated and nonperforated sections (66, 68), ribs (70) circumferentially spaced therearound and a filter medium (84) positioned around the ribs (70) having voids (92, 94) therethrough. The screen assembly (60) includes a slurry passageway (98) defined by the nonperforated section (68) of the base pipe (62), two of the ribs (70) and the portion (100) of the filter medium (84) that is circumferentially aligned with the nonperforated section (68). This portion (100) of the filter medium (84) has a filler material (96) disposed within the voids (92, 94) to create a fluid tight seal for a fluid slurry. The fluid slurry is discharged from the screen assembly (60) to a plurality of levels of the interval through exit ports (106) in a plurality of manifolds (102) when the screen assembly (60) is in an operable position. l Model for In Situ Coal Gasification, Thorsness et al., Aug. 25, 1978 (76 pages). Control Aspects of Underground Coal Gasification: LLL Investigations of Ground-Water and Subsidence Effects, Mead et al., Nov. 10, 1978 (21 pages). Environmental Controls for Underground Coal Gasification: Ground-Water Effects and Control Technologies, Warren Mead & Ellen Raber, Mar. 14, 1980 (19 pages). Results from the Third LLL Underground Coal Gasification Experiment at Hoe Creek, Hill et al., May 20, 1980 (12 pages). Results From the Hoe Creek No. 3 Underground Coal Gasification Experiment, Thorsness et al., May 1980, (11 pages). Steam Tracer Experiment at the Hoe Creek No. 3 Underground Coal Gasification Field Test, C.B. Thorsness, Nov. 26, 1980 (51 pages). Computer Models to Support Investigations of Surface Subsidence and Associated Ground Motion Induced by Underground Coal Gasification, R.T. Langland & B.C. Trent, Jul. 1981 (16 pages). Burn Cavity Growth During the Hoe Creek No. 3 Underground Coal Gasification Experiment, R.W. Hill, Jun. 8, 19