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Figure 35-5. Ideal drilling fluid equipment layout for a rig. 



The design, as shown in Figure 35-5, provides for a partition down the middle, 

 open at one end, and grading the bottom to provide gentle drainage (i/g to 14 

 inch per foot) from the extreme end of one partitioned side down to the other 

 end, through the opening in the partition, and down to a sump at the other end 

 of the second partition. The drilling fluid containing cuttings, caving, sand, silt, 

 entrained gas, air, and oil flows in at the high end of the first partition where it 

 slowly drains to the sump in the second partition, leaving all debris on the floor 

 of the pit. The entrained gas and air escape to the atmosphere, and the entrained 

 oil breaks out to float down on the drilling fluid and be trapped on the surface 

 of the drilling fluid in the sump. The clean drilling fluid returned to the well 

 assures more satisfactory cutting- and mud-analysis logs. 



BIBLIOGRAPHY 



Beck, R. W., Nuss, W. F., and Dunn, T. H., 1947, Flow properties of drilling mud: 

 Drilling and Production Practice, Am. Petroleum Inst., p. 9-22. 



732 



