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Grouting cemen

Grouting cemen

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Uzbekistan, Jizzak
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Density is 1300-2300 kg/m3. Temperature of application of t=50-150 C

Grouting cement (State standard specification 1581-78) - the product received by crushing of cement clinker, plaster and additives. Grouting cement is applied to cementation of oil and gas wells. Let out the following kinds of grouting cement: weighted, sandy, salt-resistant and low-hygroscopic, intended depending on service conditions for cold and hot wells.

At a grinding enter mineral additives in the following quantities into grouting cements: the domain granulated or electrothermophosphoric slag - no more than 20%, active mineral additives - no more than 12%, either quartz sand, or limestone - no more than 10%. In superdeep oil wells where temperature exceeds 100C, durability of a cement stone decreases. To eliminate this phenomenon, apply sandy grouting cement with the lowered maintenance of C3S and C3A in clinker and the content of the quartz sand entered at a grinding in number of 20-50%.

The grouting cement shut by 50% of water is capable to give the mobile weight (pulp) which can be pumped up in wells pumps. It is necessary that the hardened cement stone from such pulp had high initial durability. Test skhvatyvaniye terms make of the grouting cement shut by 50% of water: for cold wells - the beginning of a skhvatyvaniye not earlier than 2 hours, the end - for grouting cement no later than 10 hours, for weighted, sandy and low-hygroscopic - no later than 12 hours, salt-resistant - no later than 20 hours after a zatvoreniye; for hot wells - the beginning of a skhvatyvaniye not earlier than 1 hour 45 minutes, the end - no later than 5 hours for all cements, except salt-resistant.

For salt-resistant cement the end of a skhvatyvaniye has to come no later than 10 hours from the moment of a zatvoreniye. Strength at a bend of the samples made of grouting cement for cold wells at the age of 2 days has to make at a temperature of hardening of (22+-2)C not less than 2,7 MPas, for hot wells at the age of days at a temperature of hardening of (75+-3)C - not less than 3,5 MPas.


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