WELLDONE sodium carboxymethyl cellulose (CMC) and Poly anionic cellulose (PAC for short) are water-soluble cellulose ether derivatives prepared 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 odorless. It can be dissolved in water, has good heat-resistant stability and salt resistance, and has strong antibacterial properties.The mud fluid formulated by this product has good water loss reduction, inhibition, and high temperature resistance.It is widely used in the oil drilling and mining industry, especially brine wells and offshore oil drilling.

WELLDONE CMC and PAC, as water-soluble polymers, can be quickly dissolved in cold or hot water; they are used as thickeners, rheological control agents, binders, stabilizers, protective colloids, suspensions and water retention agents in oil drilling and mining operations. It is a good drilling mud treatment agent and material for the preparation of completion fluid.It has a high pulping rate and good salt resistance.For freshwater mud, seawater mud, and saturated brine mud, CMC and PAC are both excellent filter loss reduction treatment agents, and they have good viscosity lifting ability and high temperature resistance (150℃) ability.It is suitable for the preparation of fresh water, seawater and saturated brine completion fluids, and can be formulated into completion fluids of various densities under the weight of calcium chloride, and can make the completion fluid have a certain viscosity and low filtration loss.

WELLDONE CMC and PAC products comply with GB/T 5005 standard, European OCMA standard and API 13A standard.

2. The application of WELLDONE CMC and PAC in the oil drilling and mining industry

1.Application of CMC and PAC in drilling fluid

The non-dispersible system drilling fluid configured with CMC and PAC has a strong ability to carry drill cutters, inhibits clay dispersion, reduces clay pulping speed, and is conducive to the stability of the well wall and effectively improves the drilling speed.

The dispersed system drilling fluid configured with CMC and PAC has good suspension capacity, can accommodate more solid phases, can greatly improve particle stability, is most suitable for high-density drilling fluid configuration, and can efficiently adjust the flow denaturation of drilling fluid; it can form dense high-quality mud cakes in the drilling fluid, which has excellent filtration loss reduction and reduces free water.

The drilling fluid is treated with calcium configured with CMC and PAC, which has good calcium resistance, can prevent excessive flocculation of clay particles in the system caused by calcium ions, keep the drilling fluid in a good flocculation state, and maintain the stable solid content and rheology of the drilling fluid, so as to ensure that the drilling fluid has good and stable performance.

Brine drilling fluid, seawater drilling fluid, and saturated brine drilling fluid configured with CMC and PAC have low sensitivity to salt, strong salt resistance, calcium and magnesium resistance, and are used as rheological regulators to achieve rapid adjustment of the fluid flow under low dosage conditions. At the same time, it can quickly carry out drill cutters and maintain a low solid content, which is conducive to improving drilling speed.Used as a filter loss reducing agent, it can form a dense mud cake. Since the filtrate filtered through the filter cake is close to the original water of the formation, the filtrate has less damage to the oil and gas reservoir.

Potassium-based drilling fluids configured with CMC and PAC have low sensitivity to potassium, calcium, and magnesium salts, and can quickly and efficiently adjust the rheology of such drilling fluids. At the same time, they have good filter-reducing and failure effects, and they also have excellent ability to clean drill cutters and drill bits. The effect is obvious in easy-to-drill formations.

The polymer drilling fluid configured with CMC and PAC has good compatibility with other polymers, strong suspension ability, timely and efficient cleaning of drill cutters, and synergistically keeps the drilling fluid low in solid phase and low in clay dispersion. At the same time, it is also an excellent filter loss reducing agent.

The low-solid-phase drilling fluid configured with CMC and PAC can quickly and efficiently adjust the flow denaturation of the drilling fluid, has excellent suspension ability, and can remove drill cutters in a timely and efficient manner, so that the drilling fluid maintains a low solid content, improves the drilling speed, stabilizes the well wall, and has excellent filtration failure effect.

Environmentally friendly drilling fluids configured with CMC and PAC, the products are green and environmentally friendly, non-toxic, harmless, odorless, biodegradable, and not easy to corrupt during use. The maintenance cost of drilling fluids is low, and the health and safety of construction personnel are guaranteed. It is suitable for drilling under various complex geological conditions and is harmless to agricultural production.

2. Application of CMC and PAC in cementing fluid (completion fluid)

The grout configured with CMC and PAC can improve the flowability of the cementing fluid, so that it has a suitable initial viscosity and low filtration loss, while protecting the well wall and preventing fluid from entering the pores and cracks.

The containment solution configured with CMC and PAC is used to adjust the fluidity, thixotropic properties and the ability of the liquid to suspend the solid phase. Because the product has good salt resistance (especially monovalent metal ions), the product is used to clean the brine-type containment solution. Obvious effect.

The workover fluid formulated with the company's CMC and PAC is low-solid phase, which will not block the permeability of the production layer due to solids, and will not damage the production layer; it also has low water loss, which reduces the amount of water entering the production layer, and the incoming water will form a water town due to the blocking of the emulsion. Phenomenon.Workover fluids formulated with CMC and PAC provide advantages that other workover fluids do not have.Protect the production layer from permanent damage; it has the carrying capacity to clean the borehole, and the workload of maintaining the borehole is reduced; it has the ability to resist the infiltration of water and sediment, and rarely bubbles; it can be stored or transferred from well to well, and the cost is lower than that of ordinary mud workover fluid.

3. Application of CMC and PAC in fracturing fluid

The fracturing fluid formulated with CMC and PAC can quickly increase the viscosity of the fracturing fluid, efficiently carry the proppant into the cracks of the oil well, establish a permeable channel, quickly reduce the filtration loss, and quickly increase the formation pressure to achieve efficient pressure transfer. The product has no residues, no harm to the bottom layer, high pumpability, low wear resistance, and has a certain ability to carry proppants.

The fracturing fluid formulated with PAC can withstand 2% KCI solution (must be added when preparing the fracturing fluid) and has good solubility, small addition, no residue, can effectively reduce the filtration loss of the fracturing fluid, and has good salt resistance and temperature resistance, easy to use, can be formulated on site, and the glue-forming speed is fast, and the sand carrying capacity is strong.Used in formations with low osmotic pressure, its fracturing effect is even better.Can be used instead of guar gum.