Wells – Processes – Heating – cooling or insulating
Patent
1990-04-23
1992-02-04
Novosad, Stephen J.
Wells
Processes
Heating, cooling or insulating
166 50, 166266, 166272, E21B 4324, E21B 4340
Patent
active
050852752
ABSTRACT:
The degradation of steam quality due to heat losses prior to its injection into a heavy oil reservoir is reduced by a process utilizing the heat contained in a stream of reservoir fluids produced from the same reservoir, following a cycle of steam injection. These hot reservoir fluids are produced from one of several horizontal drainholes connected to the same vertical cased well, while at least one of the other drainholes is under cyclic steam injection. Steam from a boiler located in close proximity of the well head is conveyed downhole through an insulated tubing to a Downhole Valve Section used to direct the flow of steam from the steam tubing to each of the drainholes in succession and to direct the flow of reservoir fluids from the previously steam-injected drainholes to the production tubing. Both tubings are installed within the casing of the vertical well and each of them is dedicated to carrying only one type of fluid: steam or reservoir fluids. Only the drainhole liners see an alternance of steam and of reservoir fluids. The heat contained in fluids supplied from the surface for lifting the produced fluids to the surface is also used to reduce heat losses from the steam tubing to the cold rocks surrounding the well. The heat loss reduction is achieved by reducing the temperature gradient across the insulation layer of the steam tubing. Detrimental heat losses through the well casing can also be reduced by using an insulated production tubing, concentric with the central insulated steam tubing.
REFERENCES:
patent: 3312281 (1967-04-01), Belknap
patent: 3373805 (1968-03-01), Boberg
patent: 3438442 (1969-04-01), Pryor et al.
patent: 3525399 (1970-08-01), Bayless et al.
patent: 4160481 (1979-07-01), Turk et al.
patent: 4201420 (1980-05-01), Likholai et al.
patent: 4257650 (1981-03-01), Allen
patent: 4598770 (1986-07-01), Shu et al.
patent: 4718486 (1988-01-01), Black
Novosad Stephen J.
S-Cal Research Corporation
LandOfFree
Process for conserving steam quality in deep steam injection wel does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for conserving steam quality in deep steam injection wel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for conserving steam quality in deep steam injection wel will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-342602