Measuring and testing – Borehole or drilling – Fluid flow measuring or fluid analysis
Patent
1996-05-29
1997-06-03
Brock, Michael
Measuring and testing
Borehole or drilling
Fluid flow measuring or fluid analysis
16625001, E21B 4908
Patent
active
056356366
ABSTRACT:
A method is provided for determining the inflow rates of gas and liquid upon completion of an underbalanced well. The casing is placed, blocking fluid communication between the well and the formation. A tubing string is run in, forming an annular space and a tubing bore. The well is conditioned by removing sufficient liquids to create an underbalanced state and leaving a gas-filled space above any residual liquid. The volume of the gas-filled space in the annular space and the tubing bore is determined. The well is perforated, opening communication between the well and the formation. Pressure within the tubing bore and annulus is measured as a function of time. The rate of change of pressure is dependent upon the nature of the incoming fluid; be it gas or liquid. From the above, the rate of incoming fluid can be established as a function of the volume of the gas-filled space and the rate of change of pressure. The inflow rates of solely gas or solely liquid may be determined whether substantially all the liquid is removed during conditioning or only some of the liquid is removed.
REFERENCES:
patent: 4123937 (1978-11-01), Alexander
patent: 5249461 (1993-10-01), Ponder et al.
patent: 5551344 (1996-09-01), Couet et al.
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