Abstract: A method of blocking a water out zone in a production well includes the steps of connecting a throttle unit to a dump bailer, wherein the throttle unit is internally defined a flowing space, which can be adjusted in size to thereby control a flow rate of cement for blocking the water out zone; loading the cement into the dump bailer; slowly lowering down the loaded dump bailer to the water out zone in the production well; opening an outlet of the dump bailer under control, so that the cement flows from the dump bailer into the throttle unit and is released at a flow rate preset by adjusting the size of the flowing space; allowing the released cement to load up in the water out zone and slowly permeate into a gravel layer in the production well before becoming cured to block the water out zone.

Abstract: In a method of blocking a water-out zone in a gas well by dumping cement and injecting pressurizing gas, a gas is injected into a target well to push and press accumulated water in the well back into the formation surrounding the well, so that the well is water-free; meanwhile, a dump bailer is lowered to the water-out zone in the well using a wire line. When the dump bailer has reached the water-out zone, it is controlled to open a bottom opening thereof to release cement milk loaded therein. The released cement milk accumulates in the water-out zone and then slowly flows into a gravel layer between a screen pipe and a wall of the well. The gas injection continues until the cement milk is cured and hardened to achieve the object of blocking the water-out zone.

Abstract: In a method of blocking a water-out zone in a gas well by dumping cement and injecting pressurizing gas, a gas is injected into a target well to push and press accumulated water in the well back into the formation surrounding the well, so that the well is water-free; meanwhile, a dump bailer is lowered to the water-out zone in the well using a wire line. When the dump bailer has reached the water-out zone, it is controlled to open a bottom opening thereof to release cement milk loaded therein. The released cement milk accumulates in the water-out zone and then slowly flows into a gravel layer between a screen pipe and a wall of the well. The gas injection continues until the cement milk is cured and hardened to achieve the object of blocking the water-out zone.

Abstract: A method of blocking a water out zone in a production well includes the steps of connecting a throttle unit to a dump bailer, wherein the throttle unit is internally defined a flowing space, which can be adjusted in size to thereby control a flow rate of cement for blocking the water out zone; loading the cement into the dump bailer; slowly lowering down the loaded dump bailer to the water out zone in the production well; opening an outlet of the dump bailer under control, so that the cement flows from the dump bailer into the throttle unit and is released at a flow rate preset by adjusting the size of the flowing space; allowing the released cement to load up in the water out zone and slowly permeate into a gravel layer in the production well before becoming cured to block the water out zone.