Advantages Disadvantages of Air Drilling Fluids

There are a number of significant advantages for using air as a drilling fluid. Table 5 lists some of these advantages as well as some of the disadvantages.

f Table 5 \

Dry Gas Versus Liquid Muds

Advantages

Disadvantages

Excellent ROP in dry competent formations.

Will not tolerate water.

Low-cost fluid.

Dust and noise problems on location.

Longer bit life.

Excessive erosion near top of hole where expansion results in high annular velocity.

Minimum damage to water-sensitive pay zones.

May cause downhole fire when hydrocarbons are encountered. (Air Drilling)

Little or no fluids disposal problems.

Hole cleaning success difficult to determine due to inability to adequately quantify cuttings removal.

Hydrocarbon identification immediate and continuous.

Requires experienced rig personnel.

Lost circulation eliminated.

Special (rental) equipment required. Limited information on reservoir characteristics because cuttings are pulverized.

V

Disposal of waste gas can be a hazard. (Gas Drilling)

Table 6 compares Mist and Dry Gas drilling fluids. Mist offers nearly the same advantages as dry gas versus liquid muds with one exception: it can handle a sizable water volume compared to dry gas drilling. The Table also lists some of the disadvantages of using mist versus dry gas.

Table 6 compares Mist and Dry Gas drilling fluids. Mist offers nearly the same advantages as dry gas versus liquid muds with one exception: it can handle a sizable water volume compared to dry gas drilling. The Table also lists some of the disadvantages of using mist versus dry gas.

f Table 6 \

Mist Versus Dry Gas

Advantages

Disadvantages

Same as dry gas except chemical additive cost increases

Requires more air volume.

Handles sizeable water influx.

Corrosive.

V

More hole enlargement due to water-shale interaction. y

Stiff foam exhibits additional advantages over dry gas or mist drilling fluids. Table 7 lists some of these advantages as well as some of the disadvantages.

f Table 7 \

Foam Versus Mist or Dry Gas

Advantages

Disadvantages

Wall building capability

Increased mud and chemical costs.

V

Loses solids carrying capability when encountering oil, salt water or calcium ion contamination../

Stable Foam Versus Stiff Foam

Advantages

Disadvantages

Lost circulation and formation damage eliminated.

High surfactant costs.

Low compression requirements.

Additive ratios critical.

Good thermal stability.

Specialized equipment required for measuring and regulating liquid and air proportions and quantities.

Compatible with oil, salt water and calcium and most formation contaminants.

Can safely absorb considerable volume of gas into aqueous foam rendering it nonflammable until sumped.

Less hole washout in unconsolidated formations while drilling.

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Responses

  • ARVID
    What is the disadvantages of additive in drilling?
    3 years ago
  • paul
    What are the advantages of drilling with air based fluids?
    2 years ago
  • Yonatan
    What are the disadvantages of drilling mud types?
    2 years ago
  • MIKE SEILER
    What are the advantages and disatvantages of gas base mud?
    11 months ago
  • SOPHIA
    What drilling fluid advantages ?
    8 months ago
  • grimalda
    How faster is air drilling vs mud drilling?
    8 months ago
  • crispino
    What are the pros and cons of air drilling?
    4 months ago

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