Study on performance improvement of oil well cement slurry by poly ether ether ketone

Abstract

After the oil well cement solidifies, the internal original void causes the inherent strength of the cement stone to be insufficient, and the structural integrity of the cement stone is damaged after the external load, which is not conducive to the subsequent oil and gas exploitation. In order to make up for the inherent deficiency of cement paste strength, the effect of PEEK with high strength and high elastic modulus on the properties of oil well cement was studied. The conventional properties and mechanical properties of PEEK cement paste with different contents were evaluated. The microstructure of PEEK cement paste was observed by scanning electron microscope. The experimental results show that compared with the cement paste without peek, the rheological properties of cement paste with 1% ∼ 6% peek are worse, the thickening time is shorter, and the water loss is reduced. After curing for 28 days, the compressive strength of 5% peek cement paste decreased by 15%, the flexural strength and impact strength increased by 21% and 11% respectively, and the elastic modulus decreased by 50%. Peek is uniformly dispersed and filled in the cement paste. When the cement paste is subjected to external load, peek will deform, absorb part of the energy and hinder the crack propagation, which improves the ability of the cement paste to resist external load.