| 摘要 |
A method for virtual metering of fluid flow rates in a cluster of fluid injection wells which are connected to a collective fluid supply header conduit assembly comprises: a) sequentially testing each of the injection wells of the cluster by closing in that well and then performing a dynamically disturbed injection well test (DDIT) on the tested well, during which test the injection rate to the tested well is varied over a range of flows whilst the fluid flowrate in the header conduit assembly and one or more injection well variables, including tubing head pressure, of the well under test and of the other wells in the cluster are monitored, and the other wells in the cluster are controlled such as to cause their tubing head pressures or flow meter readings to be approximately constant for the duration of the test; b) deriving from step a a well injection estimation model for each tested well, which model provides a correlation between variations of the fluid flowrate attributable to the well under consideration in the header conduit assembly, and variations of one or more well variables monitored during each dynamically disturbed injection well test (DDIT); c) injecting fluid through the header conduit assembly into the cluster of wells whilst a dynamic fluid flow pattern in the header conduit assembly and one or more well variables of each injection well are monitored; d) calculating an estimated injection rate at each well on the basis of dynamic fluid flow pattern in the header conduit and the monitored well variables and the well injection estimation model of step b. |
