Application of Polyanionic Cellulose PAC in Oil Drilling and Recovery Industry

Sodium carboxymethyl cellulose (CMC) is a water-soluble cellulose ether derivative obtained by chemical modification of natural cellulose. It is an important water-soluble cellulose ether. It is a white or slightly yellow powder or Granular, non-toxic and tasteless.

It can be dissolved in water, has good heat stability and salt resistance, and has strong antibacterial properties. The mud fluid prepared by this product has good water loss reduction, inhibition and high temperature resistance. The cmc oil drilling grade is widely used in oil drilling and exploitation industry, especially in brine wells and offshore oil drilling.

As a water-soluble polymer, sodium carboxymethyl cellulose CMC can be rapidly dissolved in cold water or hot water; used as a thickener, rheology control agent, binder, stabilizer, protective colloid, and suspending agent in oil drilling operations It is a good drilling mud treatment agent and a material for the preparation of completion fluids. It has high slurry production rate and good salt resistance.

For light cement slurry, sea cement slurry and rain-saturated salt cement slurry, cmc oil drilling grade is an excellent filtration loss reduction treatment agent, and has good viscosity improvement ability and high temperature resistance (150 ℃) ability. It is suitable for preparing freshwater, seawater and saturated brine completion fluids, and can be prepared into completion fluids of various densities under the addition of calcium chloride, and the completion fluids can have a certain viscosity and low filtration.

Ⅰ. Applications of polyanionic cellulose PAC in drilling fluid

The polymer drilling fluid prepared with PAC has good compatibility with other polymers, strong suspending ability, can clean up drilling cuttings in a timely and efficient manner, and synergistically keep the drilling fluid with low solid phase and low dispersion of clay, and is also an excellent reducing agent. Fluid loss agent.

The low-solid phase drilling fluid configured with polyanionic cellulose PAC can quickly and efficiently adjust the rheology of the drilling fluid, and has excellent suspension ability, which can remove drilling cuttings in a timely and efficient manner, so that the drilling fluid maintains a low solid content and increases the drilling speed. , stabilize the well wall, and have excellent filtration reduction effect.

The environmentally friendly drilling fluid configured with PAC is environmentally friendly, non-toxic, harmless, odorless, biodegradable, not easy to corrupt during use, low maintenance cost of drilling fluid, and guaranteed for the health and safety of construction workers. It is suitable for drilling needs of various complex geological conditions and is harmless to agricultural production.

Ⅱ. Excellent performance of polyanionic cellulose PAC in oilfield applications

1. High degree of substitution, good substitution uniformity, high viscosity and low dosage, effectively improving the efficiency of mud use;

2. Good moisture resistance, salt resistance and alkali resistance, suitable for fresh water, sea water and saturated brine water-based mud;

3. The formed mud cake is of good quality and stability, and polyanionic cellulose PAC can effectively stabilize the soft soil structure and prevent the well wall from collapsing;

4. It is suitable for the mud system where the solid content is difficult to control and the variation range is large.