Comparison of weighted drilling fluid and non-weighted drilling fluid

1. Weighted drilling fluid
Because the high solid content affects the performance of the separator, the weighted material is mainly accumulated in the underflow waste, so the hydrocyclone is not commonly used in the weighted drilling fluid.

Generally, the use of centrifuges to process the heavier drilling fluid can reduce the number of dilutions and the consumption of barite. By comparing the cost of using the centrifuge and the cost of recycling barite from waste, the economic benefits are evaluated. Although this evaluation is very effective and important, it is also the basis for evaluating economic benefits. However, using centrifuges to process drilling fluid can make the drilling fluid have better performance and have better economic benefits.

The influence of the centrifuge on the volume of waste must also be considered. The volume and overflow of the centrifuge feed diluent are obvious influencing factors, but there is such a less obvious but very important fact that the use of liquid to treat colloidal or similar colloidal particles can reduce the number of dilutions, thereby reducing Drilling fluid cost and waste fluid volume.

The approximate volume of the waste liquid reduced by the overflow of the centrifuge can be calculated by the volume of the solid phase removed. Assuming that these solid phases are all colloids or very small particles that cause accidents, if they cannot be separated out, only the dilution method can be used to maintain the volume concentration at 5%. The volume of the diluent is 19 times the volume of the separated solid phase as the approximate volume reduced in the dilution.

The economic evaluation of the centrifuge must include the cost of preparing the drilling fluid for dilution, the reduced volume of waste fluid, and the value of the barite returned to the system through the underflow.
2. Non- weighted drilling fluid

The economics of using centrifuge waste underflow to reduce the solid phase of non-aggravated drilling fluid can be evaluated by dilution and different waste disposal costs.

The impact of the centrifuge on the drilling fluid cost can be determined by calculation, and the value is equal to the dilution volume required to compensate for separating the solid phase multiplied by the unit volume of drilling fluid cost. Because all the dilution volume is directly added to the waste liquid volume, the processing cost of the volume increase after dilution must also be prepared to increase.

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