Advantages Disadvantages of Lignite Lignosulfonate Deflocculated Muds

Lignite/Lignosulfonate Muds have many advantages. They are easily weighted, provide good filtration control and are economical to formulate and maintain. The major drawback to running this mud is that it tends to disperse cuttings unless lignosulfonate concentrations are high, in the 12-15 lbs per barrel range, in which case the yield point and gel strengths may be nil. Table 3 lists common advantages and disadvantages of lignite/lignosulfonate (deflocculated) muds.

Table 3

Advantages/Disadvantages of Lignite/Lignosulfonate Muds

Table 3

Advantages/Disadvantages of Lignite/Lignosulfonate Muds

Advantages

Disadvantages

Easily weighted to 18 lb/gal provided low gravity solids are kept low.

Disperses cuttings, making mechanical removal more difficult.

Good filtration control with low permeability filter cake.

More annular velocity required for adequate hole cleaning - low rheology.

Simple makeup and easy maintenance.

Hole enlargement in clay-bearing formations.

Good corrosion protection.

Effluent discharge considerations - BOD (Biological Oxygen Demand).

Economical to prepare and maintain up to 325°F.

Disposal concerns if it contains heavy metals or Cr+++.

Effective in salinity range from fresh water to seawater.

Deteriorate at high temperatures (325°F or greater) forming carbonates and sulfide ions.

Easily converted to lime or gyp mud. \Cinhibitive muds).

J

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Responses

  • sara
    What are the advantages of lignite?
    9 years ago
  • Dean
    Why put lignight in drilling mud?
    1 year ago

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