JP3416801B2 - Underground oil recovery method and device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method and an apparatus for recovering underground oil, and more particularly to a method and an apparatus for recovering underground oil using a recovery well.

[0002]

2. Description of the Related Art Conventionally, there has been no known method and apparatus for effectively collecting and removing oil that has penetrated into the ground at a gas station or the like.

[0003]

The underground oil as described above pollutes groundwater and has a great adverse effect on the environment.

The object of the present invention is to obtain a method and apparatus for effectively recovering such underground oil.

[0005]

The underground oil recovery method of the present invention comprises a step of excavating a recovery well from the ground deeper than the groundwater table, and groundwater in this recovery well is pumped into an oil / water separation tank by an underwater pump and recovered. The process of lowering the water level in the well from the groundwater level by a desired level, and when the water level in the recovery well increases by the desired level after a desired time, the floating oil in the recovery well is transferred to the floating oil separation tank together with the groundwater. A step of pumping with a piston pump, and as a result, when the water level in the recovery well is lower than the groundwater level by the desired level, the submersible pump is restarted to pump the groundwater in the recovery well into the oil / water separation tank. ,.

In the method for recovering underground oil according to the present invention, the lower part of the floating oil separation tank is connected to the upper part of the oil / water separation tank, and the lower part of the oil / water separation tank is connected to the upper part of the auxiliary oil / water separation tank. The method further comprises the step of discharging groundwater to the outside from the lower part of the separation tank.

The underground oil recovery system of the present invention comprises an oil / water separation tank, a floating oil separation tank, a recovery well drilled deeper than the groundwater level from the ground, and groundwater in the recovery well located at the bottom of the recovery well. A submersible pump for pumping into the separation tank, a floating oil intake member having a floating oil (leakage oil) recovery opening that moves up and down together with the water surface in the recovery well, and a floating oil intake member inside the recovery well via the floating oil intake member. A piston pump for pumping the floating oil together with groundwater to the floating oil separation tank, a means for communicating the lower part of the oil-water separation tank with the upper part of the oil-water separation tank, and means for discharging the groundwater from the lower part of the oil-water separation tank to the outside. And consist of.

In the underground oil recovery system of the present invention, the floating oil intake member is a bellows having an opening on the upper surface,
It is characterized by comprising a float attached to the upper part of the bellows, and means for communicating the lower part of the bellows with the piston pump.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIG.
The recovery well 2 is excavated deeper than the water table 3, a submersible pump 4 with a float is installed at the bottom of the recovery well 2, and the ground water 6 in the recovery well 2 is pumped into the oil / water separation tank 7 through the pipe 5. When the water level 8 of the groundwater 6 in the recovery well 2 is lower than the groundwater level 3 by a desired level, this is detected by the float and the operation of the submersible pump 4 is stopped.

After a desired time, groundwater flows into the recovery well 2 and the water level 8 in the recovery well 2 increases to a desired level. For example, when the groundwater level 3 approaches the groundwater level 3, groundwater enters the recovery well 2. Along with this, underground oil is flowing in.

Up and down with the water surface 8 in the recovery well 2,
A floating oil intake member 9 having a floating oil (leakage oil) recovery opening is provided, and a piston pump 1 is provided to the floating oil intake member 9 via a pipe 10.
1 is connected, and when the level of the water surface 8 in the recovery well 2 reaches a desired value, this is detected by a float or the like (not shown), and the floating oil in the recovery well 2 is collected together with groundwater by the piston pump 11. It is pumped up to the floating oil separation tank 12.

As a result, when the water level 8 in the recovery well 2 is lower than the ground water level 3 by the desired level, this is detected, the operation of the piston pump 11 is stopped, and the submersible pump 4 is restarted. The groundwater in the recovery well 2 is pumped into the oil / water separation tank 7, and this operation is repeated.

The floating oil naturally separated in the upper portion of the floating oil separation tank 12 is periodically collected. Further, the lower part of the oil / water separation tank 12 is connected to the upper part of the oil / water separation tank 7 via an overflow pipe 13, and the lower part of the oil / water separation tank 7 is connected to an upper part of the oil / water separation tank 15 via an overflow pipe 14. The ground water is discharged from the lower part of the oil / water separation tank 15 through the overflow pipe 16 to communicate with the outside.

A float switch 17 is provided in the floating oil / water separation tank 12 to detect the upper limit of the liquid level in the floating oil / water separation tank 12 to stop the operation of the piston pump 11 to prevent oil outflow. Is preferred.

The floating oil intake member 9 is, for example, a bellows-like member having an opening in the upper surface, a float is attached to the upper portion of the member to float, and the pipe 1 is attached to the lower portion.
When 0 is connected and the piston pump 11 is activated to suck the water in the bellows, the upper surface of the bellows is lowered together with the float below the water surface 8 in the recovery well 2, and as a result, the floating oil on the water surface 8 is It is preferable to be able to pump effectively.

[0017]

As described above, according to the underground oil recovery method and apparatus of the present invention, the underground oil can be recovered very safely and reliably, and the groundwater under the recovery well 2 is pumped up by the submersible pump, and the floating oil is removed. Since the oil is pumped up by the piston pump, the floating oil and groundwater can be collected in the separation tank 12 without being stirred and mixed with each other, and there are great advantages such as good oil-water separation efficiency.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a ground oil recovery method and device of the present invention.

[Explanation of symbols]

1 ground 2 recovery wells 3 water table 4 submersible pump 5 pipes 6 groundwater 7 oil-water separation tank 8 water surface 9 Capture member 10 pipes 11 piston pump 12 Oil-water separation tank 13 Overflow pipe 14 Overflow pipe 15 Oil-water separation tank 16 overflow pipe 17 float switch

Claims (4)

(57) [Claims] 1. A step of excavating a recovery well from the ground deeper than the water table, and groundwater in the recovery well is pumped into an oil / water separation tank by an underwater pump to reduce the water level in the recovery well to a desired level below the water table. And a step of pumping the floating oil in the recovery well together with groundwater into the floating oil separation tank by a piston pump when the water level in the recovery well increases by a desired level after a desired time elapses. When the water level of the above is lower than the groundwater level by the desired level, the submersible pump is restarted to pump up the groundwater in the recovery well into the oil / water separation tank, the underground oil recovery method. 2. A lower part of the floating oil separation tank is connected to an upper part of the oil / water separation tank, a lower part of the oil / water separation tank is connected to an upper part of an auxiliary oil / water separation tank, and ground water is supplied from a lower part of the auxiliary oil / water separation tank. The underground oil recovery method according to claim 1, further comprising a step of discharging the oil to the outside. 3. An oil / water separation tank, a floating oil separation tank, a recovery well excavated from the ground deeper than the groundwater table, and a groundwater located at the bottom of the recovery well for pumping groundwater in the recovery well into the oil / water separation tank. Floating oil (leakage oil) that moves up and down with the submersible pump and the water surface in the recovery well
A floating oil intake member having a recovery opening, a piston pump for pumping the floating oil in the recovery well together with groundwater into the floating oil separation tank through the floating oil intake member, a lower portion of the oil water separation tank and the oil water separation An underground oil recovery device comprising means for communicating the upper part of the tank and means for discharging groundwater from the lower part of the oil / water separation tank to the outside. 4. The floating oil intake member comprises a bellows having an opening on the upper surface, a float attached to the upper part of the bellows, and means for communicating the lower part of the bellows with the piston pump. The underground oil recovery device according to claim 3.