Full-automatic reinjection water (additive) system and use method thereof

Abstract

The invention discloses a full-automatic reinjection water (additive) system and a use method thereof. A high-pressure pump reinjection coalbed water mode is utilized to reinject water generated by a coalbed gas well into the gas well after the water is precipitated or to appropriately supplement clean water and inject into the coalbed gas well. A utilized technical scheme is characterized in that, one end of a water return pipe is connected with a water drainage pipe of the coalbed gas well, the other end of the water return pipe is communicated with a water inlet end of a water storage tank, one end of a water injection pipe is communicated with a water outlet end of the water storage tank, the other end of the water injection pipe is connected with a water injection opening of the coalbed gas well to inject water for the coalbed gas well, and a control box is arranged on the water injection pipe and used for controlling the whole water circulation process; a metering pump in the control box is a high-pressure pump, the metering pump is arranged on the water injection pipe, a water level control module and a remote control module are both electrically connected with the metering pump and used for controlling work of the metering pump, and the water level control module is inserted into the water storage tank through three electrodes to guarantee that a water level of the metering pump in the water storage tank works between the upper limit electrode and the lower limit electrode.

Description

technical field [0001] The invention discloses a fully automatic water reinjection (additive) system and its application method, belonging to the technical field of coal bed gas well development. Background technique [0002] In the area where many coalbed methane wells are located in my country, the coal seam is soft and the coal powder content is high. During the drainage process, the discharge water contains a large amount of coal powder. With the continuous drainage and production of coalbed methane wells, the water production of coalbed methane wells decreases, and the proportion of coal powder content in the produced water Continuously increasing, forming viscous coal slurry, the consequences: [0003] 1. Block the fixed valve and the floating valve of the whole cylinder pump of the coalbed methane well, resulting in reduced pump efficiency or no water; [0004] 2. The resistance of the screw pump rotor increases, resulting in an increase in the current of the screw pu...

AI Technical Summary

Problems solved by technology

[0003] 1. The fixed valve and the floating valve of the whole cylinder pump of the coalbed methane well are blocked, resulting in reduced pump efficiency or no water;

[0004] 2. The resistance of the screw pump rotor increases, resulting in an increase in the current of the screw pump, pump jamming, or wear of the rubber of the screw pump and a decrease in pump efficiency;

[0005] 3. A large amount of pulverized coal is deposited at the bottom of the coalbed methane well, and the coal slurry has high viscosity and high density, which is difficult to discharge, blocks the gas production channel, and may even re-enter the coal seam, seriously affecting the production of the coalbed methane well;

[0006] 4. Frequent workover not only increases the cost, but also seriously affects the continuous drainage and production of coalbed methane wells, resulting in reduced gas well production and irreparable losses

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