FINGERPRINTING FOR GAS LIFT DIAGNOSTICS

摘要

Method for determining the depth of entry of lift gas into a production tube of a gas lift well includes the step of determining the concentration of GCOI endogenous to formation gas produced from the production tube of a gas lift well and absent from gas used as the lift gas in said gas lift well versus time after a perturbation of the rate of introduction of said lift gas into said production tube via one or more gas lift valves. The invention includes a system configured for evaluating the performance of gas lift well, including a separator, a flow regulation device, a measurement device for measuring over time the concentration of a GCOI in production fluids, a data collection and storage device for recording data from the measurement device, and a computer program product embodied on a computer-readable medium for analyzing the data collected by the measuring device.

主权项

1. A method for determining the depth of entry of lift gas into a production tube of a gas lift well, the gas lift well including a casing annulus including a lift gas, one or more production tubes including production fluids and surrounded by the casing annulus, and gas lift valves providing for entry of lift gas from the annulus to the production tube(s), comprising determining the concentration of a GCOI endogenous to a formation gas produced from the production tube of a gas lift well and absent from gas used as the lift gas in said gas lift well versus time after a perturbation of the rate of introduction of said lift gas into said production tube via one or more gas lift valves.