Stabilization and control of hot two phase flow in a well

Details Stabilization and control of hot two phase flow in a well Stabilization and control of hot two phase flow in a well

1994-04-13

1995-05-09

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166 50, 166 53, 166 64, 166272, 166370, 73155, E21B 4324, E21B 4312, E21B 4706

Patent

active

054131758

ABSTRACT:
A method is provided for the stabilization and control of the two-phase flow of hot fluid containing water issuing from the top of an upwardly rising conduit or riser of a horizontal oil-production well. The fluid enters the bottom of the riser at a temperature higher than the saturation temperature of water at the conditions prevailing at the top of the riser. A first mass rate flow controller is coupled to a mass rate flow detector at the top of the well for controlling mass flow at a substantially constant rate over a short time interval. Signals indicative of the optimal flow rate for the process are input to a second controller. The second controller adjusts the mass flow rate setpoint of the first controller. The second controller has a time constant significantly longer than that of the first controller. Thus, the mass rate of hot fluid is controlled at a substantially constant mass rate over the short term, thereby stabilizing two-phase flow, and is adjusted over the longer term to control the flow of fluid at an optimal rate.

REFERENCES:
patent: 4228855 (1980-10-01), Sustek, Jr. et al.
patent: 4344485 (1982-08-01), Butler
patent: 5046559 (1991-09-01), Glandt
patent: 5094103 (1992-03-01), Wicks, III et al.
patent: 5148869 (1992-09-01), Sanchez
patent: 5215146 (1993-06-01), Sanchez
patent: 5273111 (1993-12-01), Brannan et al.
patent: 5318124 (1994-06-01), Ong et al.

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