PROCEDURE FOR CONTROL OF GAS-OIL INGRESS IN WELL AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2011 - IPC E21B47/00 

FIELD: gas and oil production.

SUBSTANCE: hydraulic pressure pulses propagating from wellhead to bottomhole and from bottomhole to wellhead are excited in drilling agent at wellhead. There are determined values Δt corresponding to difference between value t_K of summary time of hydraulic pressure pulses propagation in controlled drilling agent and value t_source of summary time of hydraulic pressure signal propagation in source drilling agent. At Δt≥Δt_Kp, where Δt_Kp is a value at which there occurs unallowable intensive gas-oil ingress in well, a preventor is shut down and flow of drilling agent is directed along a line of throttling. A value of hydrocarbons influx is controlled with change of pressure at the wellhead. There is chosen a value of pressure whereat value Δt approaches 0. A value of drilling agent density preventing influx of hydrocarbons into the well is established with consideration of the above said chosen pressure value. The device for control of gas-oil ingress in well consists of receivers of signals of hydraulic pulses of pressure, of a control unit of measurement of time value t_source and time value t_source, of a counter of values t_K and t_source, of a memory unit of time value t_source, of a unit computing a value Δt, of a memory unit of a value Δt_kp, of a comparing unit for values Δt and Δt_kp.

EFFECT: expanded functionalities for control of gas-oil ingress, facilitation of operative control over influx of hydrocarbons into well.

3 cl, 2 dwg