How to reduce fluid loss in water-based drilling mud bulk
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Product Application
CMC & PAC is used as a fluid loss reducer in drilling fluid. Its function is to reduce the fluid loss of drilling fluid as much as possible by forming a low permeability, flexible, thin and dense filter cake on the borehole wall. Used as suspending agent, plugging agent and thickener for low solid drilling fluid.
1. It has good temperature resistance and salt resistance
2, the product is rarely affected by mold, so as to stabilize and extend the existence period.
3, easy to disperse in all water-based drilling fluid, from fresh water to saturated salt water drilling fluid can be used
4. It can prevent fluid from entering pores and cracks, and can be used as fracturing fluid to control the loss of fluid entering oil wells.
5, as an oil fracturing agent, to provide fracturing fluid suspended sand performance, can significantly reduce the loss of filtration and thin mud cake, and shale water has a strong inhibitory effect.
Technical indicators
Technical parameters of petroleum grade CMC (in accordance with GB/T 5005-2001)
| Indicators Model |
Viscometer 600r/min reading | Filtration loss (mL) | ||
| deionized water | 40g/L saline | saturated brine | ||
| LV-CMC | ≤ 90 | ≤10 | ||
| HV-CMC | ≥ 30 | ≥ 30 | ≥ 30 | ≤10 |
Technical Parameters of Petroleum Grade PAC
| Indicators Model |
Apparent viscosity (mPa.s) | Filtration loss (mL) | Drying loss (%) | Degree of Substitution (D.S) |
| PAC-LV | ≤ 40 | ≤16 | ≤10 | ≥ 0.9 |
| PAC-HV | ≥50 | ≤16 | ≤10 | ≥ 0.9 |
Technical Parameters of Ultra-high Viscosity Petroleum Grade CMC
| Indicators Model |
1% Brookfield Type viscosity (mPa.s) |
Degree of Substitution (D.S) | pH | Purity (%) | Drying loss (%) |
| CMC-5000 | 5000-6000 | ≥ 0.8 | 6.5-8.5 | ≥90 | ≤10 |
| CMC-6000 | 6000-7000 | ≤10 | |||
| CMC-7000 | 7000-8000 |
≤10 |
PAC-HV applies to the mud with smaller proportion and a small usage amount can increase viscosity and reduce fluid loss. A small amount of Polyanionic Cellulose can replace a lot of clay and this kind of mud can reduce the difficulties resulting from encountering CaSO42H20 or CaSO4 salt belt during drilling process.
However, PAC-LV applies to the mud with larger proportion, can reduce the fluid loss but have little effect on the viscosity. In use, Polyanionic Cellulose should be dissolved in water to prepare the solution (usually 1/40-1/20) and then add into the mud. Polyanionic Cellulose can also be compounded with other chemical agents to add into the mud.





