«Oilfield engineering»

Laboratory testing methods for curing cement slurries

UDC: 622.276.7:622.245.43
DOI: -

Authors:

¹ TatNIPIneft, Tatneft, Almetyevsk, Russia
² Almetyevsk State Petroleum Institute, Almetyevsk, Russia
³ Institute of Oil and Gas of the Federal State Budgetary Educational Institution "USPTU" in Oktyabrsky, Oktyabrsky, Russia
⁴ Blagonravov Institute of Machine Science, RAS, Moscow, Russia

Keywords: methods, adhesion, tension, tests, cement stone

Annotation:

The authors of the article discuss two procedures developed by TatNIPIneft Institute to determine properties of curing cement slurries considering the drawbacks of the existing procedures: determination of adhesion and tensile strength. The authors of the article describe adhesion determination procedure using a simple device, present diagrams and photos of the developed device, give advantages of the worked-out procedure and an example of adhesion determination using the developed procedure. Application of this procedure provides the following advantages:

– accuracy and reproducibility of test results due to the same quality of swage machined surface and swage storage in anticorrosive liquid until the tests start;

– due to the use of a swage with tapered outer surface, the effect of swage friction against the tested cement surface on test results is reduced;

– due to the use of a swage with tapered outer surface, the load transmitted by the press acts uniformly on the entire contact surface with the tested cement;

– use of a metal cylindrical mold with tapered inner surface facilitates squeezing-out cement remaining in the mold due to reduced friction effect.

Direct tensile strength tests for non-metallic materials (like set cement) are difficult to implement because of the technical difficulties in applying tensile loads to the test specimens. To determine tensile strength of various cured cements, a procedure using a simple device and a press has been developed, without the need for a tensile-testing machine. A device developed for holding a test specimen during the tensile test eliminates axial offset and over-clamping due to uniform and centered specimen holding, simplifies the device design due to the absence of grips with a specialized tensile machine and allows using a press to break the test specimens. The diagrams and photos of the developed device and an example of tensile strength determination using the developed procedure are presented in the article.

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