PAC LV for completion cementing


In the field of oil and gas production, ensuring well integrity and performance is of utmost importance. Completion cementing plays a vital role in achieving this objective. PAC LV, or Polyanionic Cellulose Low Viscosity, is a commonly use additive in completion cementing operations. In this article, we will explore the significance of PAC LV in completion cementing, its benefits, and its role in enhancing well integrity and performance. Whether you are involving in oil and gas production or seeking to deepen your knowledge of completion cementing, understanding the role of PAC LV is essential.

Understanding Completion Cementing

Completion cementing is a critical process in the oil and gas industry that involves injecting cement into the wellbore to create a barrier between different formations and ensure well integrity. It provides zonal isolation, supports well stability, and facilitates efficient production or injection of fluids.

What is PAC LV?

PAC LV, or Polyanionic Cellulose Low Viscosity, is an additive use in completion cementing operations. It is derived from cellulose and has a low viscosity, which makes it highly suitable for various wellbore conditions. PAC LV is available in powder form and is typically mix with water to create a slurry that is added to the cement mixture.

The Role of PAC LV in Completion Cementing

PAC LV serves multiple functions in completion cementing, including:

  1. Fluid Loss Control: One of the primary roles of PAC LV is to control fluid loss during cement placement. It forms a thin filter cake on the wellbore walls, reducing the permeability and preventing excessive fluid loss into the formation. This helps in achieving better zonal isolation and maintaining the desire cement slurry properties.

  2. Rheology Modification: PAC LV acts as a rheology modifier, influencing the flow and consistency of the cement slurry. It helps to maintain proper suspension of solid particles, prevent settling, and ensure uniform distribution throughout the wellbore. This is crucial for effective placement and bonding of the cement.

  3. Dispersant Properties: PAC LV exhibits dispersant properties, which aid in preventing the clumping or agglomeration of cement particles. It improves the fluidity and workability of the cement slurry, facilitating easy pumping and placement.

  4. Filtration Control: By forming a filter cake on the wellbore walls, PAC LV helps control filtration rates and minimizes the invasion of formation fluids into the cement slurry. This is particularly important in high-permeability formations where fluid loss can occur rapidly.

Benefits of Using polyanionic cellulose low viscosity in Completion Cementing

The utilization of PAC LV in completion cementing offers several benefits, including:

  1. Improve Zonal Isolation: PAC LV helps to achieve effective zonal isolation by controlling fluid loss and preventing communication between different formations. This reduces the risk of cross-flow and ensures the integrity of the wellbore.

  2. Enhanced Cement Slurry Performance: The addition of PAC LV enhances the rheological properties of the cement slurry, improving its flowability, suspension, and bonding characteristics. This results in better cement placement, reduce risks of channeling, and improve overall well integrity.

  3. Increase Wellbore Stability: By minimizing fluid loss and strengthening the cement sheath, PAC LV contributes to increase wellbore stability. It helps prevent formation damage, casing collapse, and other potential issues that can compromise well performance.

  4. Versatility in Wellbore Conditions: PAC LV exhibits excellent performance in a wide range of wellbore conditions, including high-temperature, high-pressure, and challenging fluid environments. Its low viscosity ensures ease of handling and compatibility with various cement systems.

  5. Cost-Effective Solution: PAC LV offers a cost-effective solution for completion cementing operations. Its ability to control fluid loss and improve cement slurry performance reduces the need for remedial work and enhances the overall efficiency of the well construction process.

Application of PAC LV in Well Integrity 

PAC LV plays a crucial role in enhancing well integrity throughout the life cycle of the well. Its application extends beyond completion cementing and includes:

  1. Remedial Cementing: PAC LV can be used in remedial cementing operations to repair wellbore integrity issues, such as leaks or inadequate zonal isolation. It helps in achieving proper cement bonding and sealing of the targeted zones, restoring well integrity.

  2. Casing Cementing: During casing cementing, the addition of polyanionic cellulose low viscosity improves the bonding between the casing and the surrounding formation. This strengthens the well structure, reduces the risk of gas or fluid migration, and enhances long-term wellbore integrity.

  3. Plug and Abandonment: In plug and abandonment operations, where wells are permanently sealed, PAC LV aids in creating reliable and durable cement plugs. These plugs ensure proper isolation of different zones and prevent any future fluid migration, ensuring long-term well integrity.

Considerations for PAC LV Usage 

When utilizing PAC LV in completion cementing operations, it is important to consider the following:

  1. Dosage Optimization: The proper dosage of PAC LV should be determine base on the specific wellbore conditions, desire cement slurry properties, and fluid compatibility. It is crucial to work closely with experience professionals and conduct lab tests to determine the optimal dosage for each application.

  2. Fluid Compatibility: PAC LV should be compatible with the other additives and fluids use in the cement slurry. Compatibility tests should be conduct to ensure that there are no adverse interactions that can affect the performance of the cement.

  3. Environmental Considerations: It is important to adhere to environmental regulations and guidelines when using PAC LV. Proper disposal of the cement slurry and associate waste materials should be carrie out in accordance with applicable regulations.

  4. Quality Assurance: To ensure the effectiveness of PAC LV, it is essential to source it from reputable suppliers who adhere to stringent quality control measures. This helps guarantee the consistency and reliability of the product.


What is the function of PAC LV in completion cementing? 

PAC LV serves multiple functions in completion cementing, including fluid loss control, rheology modification, dispersant properties, and filtration control.

How does PAC LV enhance well integrity?

By controlling fluid loss, improving cement slurry performance, and enhancing zonal isolation, PAC LV contributes to enhance well integrity. It helps prevent cross-flow, strengthens the cement sheath, and ensures stable wellbore conditions.

Can PAC LV be use in all types of well completion operations? 

PAC LV is suitable for a wide range of well completion operations, including casing cementing, remedial cementing, and plug and abandonment. Its versatility allows for its application in various wellbore conditions and cement systems.

What are the potential drawbacks of using PAC LV in completion cementing?

While PAC LV offers numerous benefits, potential drawbacks include the need for proper dosage optimization, ensuring fluid compatibility, and adhering to environmental regulations. It is important to work closely with professionals and follow industry best practices.

Are there any alternatives to PAC LV in completion cementing? 

Yes, there are alternative additives available for completion cementing, depending on the specific requirements and well conditions. It is advisable to consult with experts to determine the most suitable additive for a particular application.

How can I ensure the proper dosage in my completion cementing operations?

To ensure the proper dosage of PAC LV, it is recommending to work with experience professionals and conduct laboratory tests. These tests help determine the optimal dosage base on wellbore conditions, cement slurry properties, and fluid compatibility.


PAC LV, or Polyanionic Cellulose Low Viscosity, plays a crucial role in completion cementing operations. Its fluid loss control, rheology modification, and filtration control properties contribute to enhanced well integrity and performance. By using PAC LV, operators can achieve improve zonal isolation, increase wellbore stability, and cost-effective solutions for completion cementing challenges. However, it is important to consider dosage optimization, fluid compatibility, environmental factors, and adhere to industry best practices when using PAC LV. Collaborating with experience professionals ensures the successful application of PAC LV in completion cementing, leading to reliable and efficient well construction.