Jump Break

The starting point for any kind of sand control with respect to geo-mechanical

approach is proper sampling and sand screen analysis. Sieve analysis data for 97 different sand types from three oil fields in the Niger Delta area was collected and analyzed. A database of sand types was established based on nine variables that were calculated for the sand types. Principal component analysis was used to reduce the number of significant variables in the database, and to provide a basis for a prediction model for slot widths. 5 suitable sand types were then selected for laboratory testing, and four slot widths were determined for each sand type.

A series of laboratory experiments were performed to evaluate the performance of various sand control screens, and conclusions were made based on the inner and outer annular pressure of the cylinder used for the laboratory experiment. A mathematical model was developed that can be used to predict the critical slot width for other sand types from the area. From the work, using the stated procedure, 0.3mm and 0.225mm slot width can be recommended for sand control based on the samples used in this work. In conclusion from the project work, we know that the greater the pressure difference between inside and outside cylinder, the more instable the sand is.