Completion Chemicals: Types and Uses

Also known as brine (salt solution), these chemicals are a low-solid mud. Many gas and oil companies use these chemicals after extracting gases and oils from wells.

Drilling operators use completion fluids while doing well testing. Well testing is necessary for data acquisition. This data informs about hydrocarbon properties and characteristics of the underground reservoirs.

Completion fluid goes into the well to facilitate the final operations before starting the production of hydrocarbon. You cannot use completion fluids for general purposes, though. They are costly and corrosive. Here are the uses of completion fluids:

  • Facilitating Completion and Workover Operations
  • Completion operations involve perforating the casing, cementing the casing, and setting the tubing and pump.

    Completion fluids help control the well pressure. This, in turn, prevents the well from blowing out during the completion process. Also, these chemicals prevent the casing from collapsing due to overpressure.

    In general, completion chemicals prevent formation damage.

  • • Reducing Friction in Wellbore Equipment
  • Completion fluids have a high pH content. The ionic composition and chemical compatibility are equal to the reservoir formation.

    Since the chemicals prevent under balance and overbalance, they can effectively manage pressures during coil tubing drill outs.

    Therefore, the life of the coil is extended because liquids and solids are allowed access into the wellbore.

  • Offer Smooth Transition Between Completion and Reservoir Drilling
  • Completion fluids are necessary for establishing the final contact between the wellbore and product formation.

    Since these completion fluids do not damage formation or impair production performance, they work best to link completion and reservoir drilling.

Types of Fluids for Completion and Workover

The following are the types of completion fluids available. These chemicals are responsible for making the completion process possible. They include:

  • Water-based fluids
  • These fluids are relatively cheaper, available, and easy to maintain. These fluids are often used in place of drilling muds. Drilling muds cause irreversible formation damage. For example, barite, a drilling mud additive, is very difficult to get rid of chemically.

    Unless the well is perforated or underbalanced, it is advised to avoid modified drilling muds.

  • Oil-based fluids
  • These chemicals are excellent for protecting clays sensitive to water. These clays are protected against formation damage (chemical). Fluids with an oil base contain suspended and dissolved solids.

    They are less expensive compared to water-based muds. Additionally, they are less damaging than solid-free completion chemicals.

  • Clear brine fluids
  • Most companies design their completion fluids to be free of solids or contain a minimal amount of solids.

    Clear brine fluids are made up of inorganic salts. They reduce formation damage and control pressures in the reservoir. However, you must consider corrosion and crystallization of fluids when using clear brine fluids.

    Every well has a set of unique downhole characteristics. A company that understands this will chart a way forward for successful completion systems. Contact us for the best completion and workover services.