Attrition rate of regularly used sized bridging materials has been studied in order to shed light on the effect of drilling tools and downhole equipment on sized bridging materials. An instrument set up consisting of a metal cylindrical bar and hot rolling cell used for aging. The principle behind this set up is to simulate downhole tools by metal cylindrical bar and wellbore by aging cell. Water based drilling mud has been formulated using a viscosifier, a temperature extender of viscosifier and sized bridging material. In order to have a comparison, the particle size distribution (PSD) of sized bridging material has been measured before adding to the mud formulation. This PSD values has been used as a bench mark for the study. After formulating the mud, the particle size distribution of the mud has been measured in order to study the effect of mixing of the mud on the attrition of the added sized bridging material. The mud is then placed inside the hot rolling cell with metal cylindrical bar inside. The hot rolling cell is pressurized to 200 psi and hot rolled at 250 °F for 16 h. The particle size distribution of mud subjected to attrition has been measured. The PSD values for original sized bridging material, mud after mixing and mud after attrition has been compared to evaluate the attrition resistance of the given sized bridging material. The mineralogy of the sized bridging material has also been studied using X-ray diffraction analysis. This study has been carried out by dissolving a given amount of sized bridging material in hydrochloric acid. The dissolved materials are filtered off. The remaining residue has been dried and analyzed by XRD for the mineralogy in order to identify the nature of acid insoluble material.

You can access this article if you purchase or spend a download.