Product Details

Vinyl Monomer Copolymer PAC-141 (Multi-functional Polymer for Drilling Fluids)

1. Product Overview
Vinyl Monomer Copolymer PAC-141 is a multi-functional polymer additive for drilling fluids. It appears as a free-flowing powder, white or slightly yellowish, easily soluble in water to form a viscous liquid. Its molecular chain contains carboxyl groups, sodium carboxylate groups, amide groups, and other optimized functional groups, providing excellent tolerance to salts, calcium, magnesium ions, and high temperatures. It is non-toxic, non-corrosive, and highly compatible with various drilling fluid additives. Specially designed for low-solid non-dispersed polymer water-based drilling fluid systems, it significantly improves drilling fluid performance.

2. Technical Specifications

3. Key Performance & Application Effects

3.1 Optimized Rheology & Shear-Thinning Performance
It imparts excellent pseudoplasticity to drilling fluids: low viscosity under high shear at the bit reduces drilling resistance and saves energy; viscosity recovers rapidly under low shear in the annulus to effectively suspend cuttings and prevent stuck pipe due to settled solids.

3.2 Effective Fluid Loss Control & Reservoir Protection
It forms a dense polymer protective film on the wellbore, significantly reducing fluid loss into the formation, minimizing reservoir contamination caused by filtrate invasion, and protecting reservoir permeability.

3.3 Cuttings Dispersion Inhibition & Wellbore Stabilization

It encapsulates cuttings particles to inhibit their hydration, dispersion, and swelling; it also suppresses shale hydration to prevent wellbore spalling and collapse, improving drilling operation safety.

3.4 Strong Anti-Pollution & Compatibility with Complex Conditions
The optimized functional group structure enables it to maintain stable performance in complex formation environments such as high salinity, high calcium/magnesium ions, and high temperatures, adapting to various drilling fluid systems including seawater and saturated brine.

4. Recommended Applications

• Low-solid non-dispersed polymer water-based drilling fluid systems

• High-difficulty drilling operations such as directional wells, horizontal wells, and extended-reach wells

• Drilling in complex formations with high salinity, high calcium/magnesium, and high temperatures

• Oil and gas field development with high requirements for reservoir protection and wellbore stability

5. Recommended Dosage
Conventional drilling fluid systems: 0.2%–0.6% (by mass of drilling fluid).
High-salinity/high-calcium/magnesium/high-temperature systems: dosage can be increased to 0.6%–1.0%, or used in combination with other additives.

6. Packaging, Transportation & Storage
Packaging: 25kg/bag in 3-in-1 composite bags with inner polyethylene film liners, moisture-proof and leak-proof.
Storage: Store in a cool, dry, well-ventilated warehouse, protected from moisture, rain, direct sunlight, and high temperatures. Keep away from fire sources and strong oxidizing agents.
Transportation: Avoid violent collision, direct sunlight, and rain during transportation to prevent package damage.

7. Safety Precautions
Wear protective gloves, dust masks, and goggles during operation to avoid dust inhalation and contact with skin/eyes. In case of accidental contact with skin or eyes, rinse immediately with plenty of clean water; seek medical attention if discomfort persists. As a powder product, keep away from fire sources to prevent safety hazards caused by dust accumulation.

8. Disclaimer & Technical Support
All specifications and descriptions in this document are for reference only. The product shall be used in accordance with the customer’s actual working conditions and technical requirements. Customized formulations and solutions are available upon request.

Application Cases of Viscosifiers for Drilling Fluids

1. Rheology Regulation and Cuttings Bed Prevention Case for Extended-reach Horizontal Wells

Case Background: Extended-reach horizontal wells feature ultra-long horizontal sections, large circulating friction and harsh cuttings carrying conditions. Conventional drilling fluid systems have insufficient low-shear viscosity and static gel strength. During long-distance horizontal drilling, cuttings are prone to deposition and cuttings bed accumulation, resulting in increased downhole torque, tripping resistance and stuck pipe risks, which seriously affect continuous and efficient construction of horizontal sections.

Application Formula & Dosage: On the basis of conventional horizontal well water-based drilling fluid system, 0.3%–0.6% special drilling fluid viscosifier was added as the core rheology modifier. It adopts shear-thinning performance matching design to balance low circulating friction and high suspension carrying capacity.

Application Effect: The viscosifier has excellent shear-thinning rheological characteristics. It maintains low viscosity and low pump pressure during high-speed circulation to reduce downhole friction torque; it forms a stable spatial gel network under static and low-speed shear conditions, efficiently suspending cuttings and preventing cuttings bed formation. It thoroughly solves the problem of poor wellbore cleaning in long horizontal sections, reduces downhole complex rates, and significantly improves the penetration rate and safe construction efficiency of extended-reach horizontal wells.

2. Low-temperature Activation Thickening and System Stabilization Case for Northern Low-temperature Blocks

Case Background: Oilfield blocks in northern high-latitude areas have low ground temperature all year round, and the on-site mud mixing and circulating temperature is extremely low. Conventional thickeners have poor low-temperature hydration activity, slow dissolution and insufficient thickening efficiency, resulting in low drilling fluid viscosity, poor suspension performance, serious sand settling and unstable rheology, which cannot meet the rapid drilling requirements of shallow low-temperature wells.

Application Method & Dosage: 0.4%–0.7% low-temperature resistant special viscosifier was applied in low-temperature water-based drilling fluid systems. It features rapid cold water hydration and efficient thickening to optimize the rheological structure of low-temperature mud systems.

Application Effect: The product has outstanding low-temperature hydration adaptability, which can be rapidly dissolved and activated in low-temperature circulating mud to stably improve the low-speed viscosity and gel strength of drilling fluid. It effectively solves the problems of poor suspension, sand settling and unstable rheology of drilling fluid in low-temperature environments, ensures clean wellbore and stable working conditions, and realizes efficient and rapid drilling in northern low-temperature shallow blocks.

3. Salt-resistant Stable Suspension Drilling Case for High-salt Brine Formations

Case Background: Salt-gypsum and brine formations have high salinity and strong electrolyte interference. Conventional natural polymer thickeners are prone to molecular chain degradation, flocculation and viscosity failure under high salt pollution, resulting in sharp drop of drilling fluid viscosity, settlement of weighting materials and cuttings, system delamination and performance deterioration, which seriously endangers downhole safety.

Application Dosage: 0.35%–0.65% salt-resistant viscosifier was added to saturated brine drilling fluid systems to stabilize rheological parameters and solid-phase suspension performance of high-salt complex systems.

Application Effect: The salt-resistant viscosifier has stable molecular structure and strong anti-electrolyte interference ability, no viscosity attenuation or gel breaking failure under full salinity pollution. It can stably maintain the rheological balance of high-salt drilling fluid, effectively prevent barite settlement and cuttings deposition, ensure uniform and stable system performance in long-cycle high-salt drilling, and solve the technical difficulties of easy system failure in salt-bearing formations.

4.  Gel Strength Improvement and Stability Case for Solid-free Clean Drilling Fluid Systems

Case Background: Solid-free clean drilling fluid systems have no bentonite or low bentonite content, weak structural force and extremely low gel strength. The system has poor suspension and carrying capacity, which easily causes solid-phase settlement and wellbore cleaning failure during drilling and shutdown standing, and cannot meet the construction requirements of reservoir protection and precise logging wells.

Application Method & Effect: The viscosifier was applied at 0.3%–0.5% in solid-free clean drilling fluid systems. It can build a reversible high-strength gel network in low-solid systems, significantly improve static gel strength and dynamic shear viscosity, and enhance suspension and cutting carrying capacity. It does not introduce harmful solid phases, ensures low damage to the reservoir, and maintains long-term stability of clean drilling fluid systems.

5. High-temperature Rheology Stabilization Optimization Case for High-temperature Deep Wells

Case Background: Deep well high-temperature formations have bottom hole temperatures of 150–200℃. Conventional common thickeners are prone to thermal degradation and performance failure after long-term high-temperature aging, resulting in sharp drop of system viscosity, insufficient suspension performance, frequent solid-phase settlement and disordered rheological parameters, which restricts safe long-cycle drilling of high-temperature deep wells.

Application Method & Effect: The conventional dosage is 0.4%–0.6%. The high-temperature resistant viscosifier has stable high-temperature molecular activity, no thermal aging failure after long-term rolling at 180℃. It can stably maintain the rheological structure of high-temperature drilling fluid, balance viscosity and shear force, effectively avoid solid-phase settlement and cuttings accumulation under high-temperature working conditions, and ensure stable downhole working conditions and long-cycle safe drilling of high-temperature deep wells.