Successful primary cementing of coal seam wells requires slurry design considerations that conventional cementing operations typically do not consider. The unique petrophysical and geological properties of coal must be factored into the design in order to meet the basic tenets of primary cementing, i.e., zonal isolation and casing support. This paper focuses on coal seam wells cemented in the northeast Oklahoma shelf.

Cement slurry design is a critical part of any successful cementing operation. This is particularly true for coal seam wells where the unique nature of coal places additional demands on the cement. Slurry design considerations and successful slurry formulations for the area will be discussed along with an overview of primary cementing practices. Operational considerations as they apply to cementing coal seam wells in the study area will also be discussed. Conclusions and recommended practices for optimum results will also be presented.

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