Fast production decline is a well-known negative phenomenon after some hydraulic fracturing jobs. Reasonably, it is usually attributed to the fracture and reservoir parameters. One of the potential fracture parameters that might contribute to the production decline is conductivity of the proppant pack; this conductivity can be damaged by poor proppant condition. In this study, we investigate the influence of hydrogen sulfide (H2S) on the proppant conditions and performance.
The experimental study assessed the influence of H2S on proppant properties. The study analyzed not only the crush strength and sieve size alterations after exposure of proppant to high H2S content, but also the changes in proppant pack conductivity. Because the proppant pack conductivity is directly related to fluid flow within the fracture, this parameter should be considered as a key parameter for estimation of H2S influence on proppant pack performance.
According to test results, no significant influence of the H2S was revealed for all considered parameters. The proppant pack conductivity change was found to be negligible for the given conditions. Therefore, the influence of H2S on well productivity due to proppant pack conductivity impairment was not proved. The field cases and published examples presented in the current study also did not show evidence of proppant pack conductivity damage by the H2S.