pac lv drilling fluid

Product Description

PAC can be used in most water-based drilling fluid systems, including freshwater, seawater, and saline slurries, and is resistant to temperatures up to 150°C. PAC-R can assist in thickening and is used in small quantities. It is non-toxic and does not require bactericides. PAC-R also coats drill cuttings and inhibits the dispersion of active shale, thereby enhancing wellbore stability.
 

Applications/Functions:
Effectively controls water loss from mud filtrate and aids in thickening.
Helps form a thin, elastic mud cake with low permeability, reducing the risk of stuck drill bits.
Reduces erosion from filtrate and mud solids.

Advantages:
Temperature resistance up to 150°C
Non-fermenting, no need for bactericides
Suitable for use in freshwater, seawater, and saline slurries
Suitable for medium to high pH ranges
Coats shale, inhibiting its hydration swelling and dispersion

Three Core Application Scenarios:
1. Oilfield Drilling and Production: Polyanionic cellulose, as a drilling fluid additive, simultaneously increases viscosity, reduces filtration loss, and stabilizes the wellbore.
2. Coatings Industry: Polyanionic cellulose powder acts as a rheology modifier in water-based coatings, preventing pigment sedimentation without affecting brushability.
3. Building Materials: Petroleum-grade PAC is used in cement mortars to improve water retention and application smoothness, extending open time.

Unique Mechanism of Action
PAC for oil drilling fluids derives its performance advantage from the dual characteristics of its molecular chains: the long-chain structure provides steric hindrance, forming a three-dimensional network (thickening), while the negatively charged groups prevent molecular chain entanglement through electrostatic repulsion (maintaining fluidity). This dynamic balance enables it to exhibit intelligent response characteristics under shear force—"flows under strong shear and solidifies under weak shear"—making it particularly suitable for industrial scenarios requiring precise control of rheological behavior.
 

FAQ

1. Q: What is the difference between PAC and regular CMC?
A: PAC is a CMC with a higher degree of substitution, exhibiting stronger resistance to salt, calcium and magnesium, and high temperatures. It can be used in complex drilling environments such as seawater and saturated brine, and its filtration loss reduction and viscosity enhancement effects are far superior to regular CMC.

2. Q: How much less usage is required compared to CMC?
A: The usage is only 30%-50% of regular CMC, while the mud-making rate is 2-3 times that of regular CMC, resulting in lower overall usage costs.

3. Q: How to choose between high viscosity and low viscosity?
A: High viscosity type (PAC-HV) focuses on thickening and viscosity enhancement, suitable for scenarios requiring enhanced rock-carrying capacity; low viscosity type (PAC-LV) focuses on reducing filtration loss, with less impact on viscosity, suitable for systems requiring good fluidity.