Wells – Processes – With indicating – testing – measuring or locating
Reexamination Certificate
2007-10-09
2007-10-09
Mai, Lanna (Department: 3637)
Wells
Processes
With indicating, testing, measuring or locating
C166S386000, C166S372000, C166S053000, C166S072000, C166S091100
Reexamination Certificate
active
10491273
ABSTRACT:
A method and system are provided for controlling the production of oil and gas in a well such that the well operates at the edge of gas coning. Thereto the flow rate and/or pressure of the produced well effluents are controlled by a dynamically controlled choke such that continously a limited amount of gas is entrained in the produced crude oil, whereas full gas coning and breakthrough of gas from the gas cap is prevented. The choke may be controlled by a control system which includes an algorithm that takes wellhead temperatures, pressures and choke position as measured variables and which maintains the average bulk velocity of the well effluents at a substantially constant and relatively high level. Optionally, the system also maintains an optimal gas-to-liquid ratio of the well effluents.
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Mai Lanna
Shell Oil Company
Smith Matthew J.
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