polyanionic cellulose polymer

Polyanionic cellulose (PAC) and sodium carboxymethyl cellulose (CMC) have different application environments in oil drilling, as detailed below:
 

1. Polyanionic Cellulose (PAC):

1.1 Brine Wells and Offshore Oil Drilling: Petrochemical product polyanionic cellulose exhibits low salt sensitivity and strong resistance to salt, calcium, and magnesium. It can be used as a rheology modifier and filtrate reducer in brine, seawater, and saturated brine drilling fluids. It can rapidly adjust the rheology of drilling fluids under low dosage conditions, carry away drill cuttings, maintain a low solids content, and simultaneously form a dense mud cake, reducing the damage of filtrate to oil and gas reservoirs.

1.2 Calcium-Treated Drilling Fluid Environment: Calcium-treated drilling fluids prepared with PAC have excellent calcium resistance, preventing excessive flocculation of clay particles in the system caused by calcium ions, and maintaining stable solids content and rheological properties of the drilling fluid.

1.3 Wells with Complex Geological Conditions: Drilling fluids formulated with High-purity polyanionic cellulose exhibit excellent fluid loss reduction, inhibition, and high temperature resistance. They can be used in mud systems where solid content is difficult to control and varies widely, making them suitable for complex formations such as salt-gypsum layers and high-temperature environments, as well as challenging drilling conditions in marine and desert environments.

Fracturing Operations: Fracturing fluids formulated with High-purity PAC can withstand 2% KCl solutions, exhibiting good solubility, requiring only small addition amounts, and producing no residue. They effectively reduce filtrate loss and possess good salt and temperature resistance, resulting in superior fracturing performance in low-permeability formations.
 

2. Sodium Carboxymethyl Cellulose (CMC):

2.1 For easily collapsible shale formations or low-pressure permeable formations: Drilling Chemical Raw Materials PAC forms a dense colloidal filter cake on the wellbore surface, effectively preventing the loss of water and solid particles from the drilling fluid into the formation, thus protecting the wellbore stability. It is particularly suitable for easily collapsible shale formations or low-pressure permeable formations.

2.2 For shallow and medium-deep wells: Highly substituted petrochemical polyanionic cellulose exhibits excellent chemical stability in low-to-medium temperature (S120°C) well sections, is not prone to thermal degradation, and can maintain its filtration reduction effect for a long time. It is a commonly used additive in drilling fluids for shallow and medium-deep wells.

2.3 For highly deviated or horizontal wells: The three-dimensional network structure formed by CMC molecular chains and clay particles maintains the suspension of the system in a static state. In highly deviated or horizontal wells, it prevents cuttings from accumulating at the bottom edge of the wellbore, ensuring a clean borehole.

2.4 Regions with strict environmental protection requirements: Low-toxicity, biodegradable PAC powder is suitable for regions with strict environmental protection requirements, such as onshore oil fields and offshore drilling. It is compatible with water-based environmentally friendly drilling fluid systems, reducing pollution to the formation and the environment.
 

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