Sedimentation tank and drilling waste fluid treatment system

Drilling waste fluid is a mixture of drilling mud, petroleum and drilling cuttings, etc. It contains various components in drilling mud, such as clay, organic polymers, oils, inorganic salts, drilling cuttings, drilling mud additives, etc.

The content of environmental pollutants in drilling waste fluid is relatively high. If the drilling waste fluid is directly discharged without treatment, it will seriously affect the surrounding environmental quality.

In the drilling waste fluid, the content of suspended solids is often above 2000mg/L. These suspended solids are in the form of colloids, coupled with the protective effect of the drilling fluid, making it a special stable system. Stability, it is difficult to ensure the treatment efficiency and treatment quality of drilling waste fluid in the current treatment method of drilling waste fluid.

On the one hand, when dealing with drilling waste fluid in the prior art, the drilling waste fluid in the liquid inlet pipe of the sedimentation tank easily disturbs the original drilling waste fluid in the sedimentation tank, which affects the treatment efficiency and treatment of the drilling waste fluid. To solve the problem of quality, the utility model provides a sedimentation tank.

Provided is a sedimentation tank, comprising a main body, an inner cavity is arranged inside the main body, a liquid inlet pipe is arranged on the main body, and a liquid discharge head is arranged at the outlet end of the liquid inlet pipe located in the inner cavity.

And a plurality of liquid outlet holes are arranged on the surface of the liquid discharge head, and the liquid outlet holes are communicated with the inside of the liquid inlet pipe.

The drilling waste fluid flows into the inner cavity of the body through the liquid inlet pipe, and the sediment in the drilling waste liquid is deposited in the inner cavity.

The surface of the liquid discharge head is provided with several liquid outlet holes, and the liquid outlet holes communicate with the interior of the liquid inlet pipe.

When the drilling waste fluid flows into the inner cavity, the drilling waste fluid in the liquid inlet pipe can flow into the inner cavity of the body in a dispersed manner through a plurality of liquid outlet holes, thereby reducing the impact of the drilling waste fluid in the liquid inlet pipe on the inner cavity. The drilling waste fluid in the Central Plains produces impact.

It can reduce the disturbance to the sediment in the inner cavity, so that the efficiency and quality of the treatment of drilling waste fluid in the sedimentation tank can be improved.

Therefore, the sedimentation tank provided by the utility model can help the operator to improve the treatment efficiency and treatment quality of the drilling waste fluid, thereby helping the operator to make the drilling waste fluid meet the discharge standard.

  • It also includes a drill pipe screen layer arranged in the inner cavity and a liquid outlet pipe arranged on the body, and the filter screen layer divides the inner cavity into two regions.
  • After effectively filtering out the suspended solids in the drilling waste fluid, the sewage in the inner cavity can be discharged from the liquid outlet, so that the effect of the sedimentation tank on the treatment of the drilling waste fluid can be improved.
  • The screen layer divides the inner cavity into upper and lower regions, the liquid outlet pipe communicates with the upper region of the inner cavity, and the outlet end of the liquid inlet pipe extends into the lower region of the inner cavity. Through the above structure, the screen layer can effectively prevent the suspended matter in the drilling waste fluid from ascending, and the liquid outlet pipe discharges sewage from the upper area inside the main body, which can further improve the effect of the sedimentation tank on drilling waste fluid treatment.
  • The filter screen layer is formed by splicing at least two filter units, and each filter unit is provided with a filter screen.
  • When a filter unit is damaged, the damaged filter unit can be replaced alone without the need to replace the entire filter screen layer, thereby reducing maintenance costs.
  • When dealing with drilling waste fluid, it is difficult to ensure the treatment efficiency and quality of drilling waste fluid. The utility model provides a drilling waste fluid treatment system, which includes the above-mentioned sedimentation tank, and also includes waste fluids connected in sequence. Collection tank, gel breaking reaction tank, solid-liquid separation device and sewage treatment device.
  • The solid-liquid separation device includes a sedimentation tank and a first filter press connected in sequence, and the sewage treatment device includes a coagulation sedimentation tank, a sedimentation tank and an oxidation reaction tank connected in sequence.
  • And the feeding port of the sedimentation tank is connected with the discharging port of the gel breaking reaction tank, and the sewage liquid outlet of the sedimentation tank and the filtrate outlet of the first filter press are both connected with the feeding port of the coagulation sedimentation tank.
  • The sedimentation tank provided by the utility model can help the operator to improve the treatment efficiency and treatment quality of the drilling waste fluid.
  • The drilling waste fluid treatment system provided by the utility model can help the operator to make the drilling waste fluid reach the discharge standard.
  • The utility model has the advantages of simple operation, convenient use, and low cost for the treatment of drilling waste fluid.

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