Patent ID: 7694737

Claim:
A method of blocking a water-out zone in a gas well by dumping a blocking fluid and injecting a pressurizing gas, comprising the following steps: (a) continuously injecting the pressurizing gas into the gas well for a first predetermined time period, so that water accumulated in the gas well is pushed and pressed back into a formation surrounding the gas well to keep the gas well in a water-free state; (b) loading the blocking fluid in a dump bailer, and lowering the loaded dump bailer to block a water-out zone in the gas well; (c) pausing the gas injection or decreasing a pressure of the injected gas for a second predetermined period of time when the dump bailer has reached at the water-out zone, and keeping a wellhead shut-in pressure higher than a wellhead pressure before the gas injection; (d) controlling the dump bailer to open a bottom opening thereof to release the loaded blocking fluid, so that the blocking fluid is accumulated in the water-out zone; and (e) resuming the gas injection and continuously increase the pressure of the injected gas until the blocking fluid is cured and hardened to form a reliable water blocked zone at the water-out zone.