Papers by Keyword: Artificial Core

Abstract: As the core and geological conditions is poor, it is difficult to get ideal cores for the laboratory flow experiment, especially for the weak bonding natural sandstone core and core resources affects the evaluation experiment. This paper describes the use of cement as cementing agent to make artificial sandstone core technology. Based on the principle of cementation solidifying when cement meets water in normal temperature and pressure conditions, using the cement as the cementing agent , contrasting different proportion of cement and core permeability to obtained the relationship curve . With the decrease of the proportion of cement, the cementation gradually weakened. When the ratio is less than 10 than 1, the core permeability variation in saturated water or not is certain, maintained at around 5%.

Abstract: Crack universally existing underground is an important kind of pores. In order to study the elastic wave propagation in fractured medium through experiment, a new method to make artificial core with certain cracks using oil well cement and camphor sheet or thin steel sheet is put forward. Geometric parameters of the crack, such as shape, size and aspect ratio, are approximately equal to that of camphor sheet or thin steel sheet. Using the thin steel sheet to make crack can be more easy and accurate to control the crack angle than using camphor sheet. The crack opening scales at millimeters. The aspect ratio of cracks formed by camphor sheet ranges from 1.4 to 8, and aspect ratio of cracks formed by thin steel sheet ranges from 2.5 to 70. This method is proved simple and feasible by experiment practice, which can provide artificial cores with certain crack for acoustic wave propagation study.