Gas Inclusions in Gas Inclusions in Drilling CementsDrilling Cements

AlexandrAlexandr P. P. LosevLosevScientific supervisor Scientific supervisor Dr. Igor N. Dr. Igor N. EvdokimovEvdokimov

English language supervisor English language supervisor Mrs. Inna D. Mrs. Inna D. BolotovaBolotovaSupporting organization Supporting organization ““RINKO ALIANSRINKO ALIANS”” Ltd.Ltd.

““Oil and gas Oil and gas –– 20062006””Department of Physics, Department of Physics, GubkinGubkin RSU of Oil and Gas, MoscowRSU of Oil and Gas, Moscow

The Aims of the ResearchThe Aims of the Research

►►To test the new technology of aluminum To test the new technology of aluminum rings installing on a casing stringrings installing on a casing string

►►To find the interaction between aluminum To find the interaction between aluminum rings and physical properties of a cement rings and physical properties of a cement stonestone

►►To evaluate the role of gas inclusions in oil To evaluate the role of gas inclusions in oil well cementswell cements

Laboratory installation (vertical)Laboratory installation (vertical)Well

Plastic tube d=50mm

Aluminum ring

Steel ring

Steel tube d=34mm

Laboratory installation (angled)Laboratory installation (angled)

P=0.2 MPaAir from

compressor

Experimental results Experimental results –– defectsdefects

►►Gas channels through Gas channels through all the length of the all the length of the modelmodel

►►Elongate form of the Elongate form of the channels in vertical channels in vertical direction direction

►►DDcnlcnl ~ 5 mm~ 5 mm►►LLcnlcnl ~ 150 mm~ 150 mm

Experimental results Experimental results –– sources sources

►►All the gas All the gas channels begin up channels begin up with aluminum with aluminum ringsrings

►►The traces of The traces of chemical reaction chemical reaction (bubbles) opposite (bubbles) opposite the aluminum ring the aluminum ring

Possible reaction of hydrogen Possible reaction of hydrogen effervescence effervescence

22AlAl + 9H+ 9H22O + 3CaO =O + 3CaO == 3= 3HH22 + Ca+ Ca33[Al(OH)[Al(OH)66]]22

Proof of the reaction Proof of the reaction

►►Gas bubblesGas bubbles

►►White traces White traces --hydroaluminateshydroaluminates

AdvantagesAdvantages

►►The element of casing string has a The element of casing string has a tight chemical contact with cement tight chemical contact with cement stonestone

►►Water from cement slurry is Water from cement slurry is bounded trough the reaction into bounded trough the reaction into an insoluble substance an insoluble substance

DisadvantagesDisadvantages

►►The cement stone gains crumbly, The cement stone gains crumbly, porous and permeable structure porous and permeable structure near the ringnear the ring

►►Elongate gas channels can cause Elongate gas channels can cause intrareservoirintrareservoir communications communications ((crossflowscrossflows between beds)between beds)

ConclusionsConclusions

The technology of aluminum The technology of aluminum rings installing provides many rings installing provides many

advantages, taking into account advantages, taking into account several disadvantages mostly several disadvantages mostly depending on pressure and depending on pressure and temperature in the well boretemperature in the well bore

Thank You for your attention