1 teales original correlation fig 9 shows the bit

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Contribution = ⎜ ⎟ * 100 MSE ⎝ ⎠ (9) MSE was calculated using Eq. 1 (Teale’s original correlation). Fig. 9 shows the bit hydraulic contribution vs. bit HSI for WOB equal to 20,000 lb, 30,000 lb and 40,000 lb, respectively. Fig. 9 shows a linear relationship between the bit hydraulic contribution and HSI, it also shows that the bit hydraulic contribution reduces with WOB. A common practice in the industry is to use HSI equal to 2.0 hp/in2 to “optimize” the field operations. For HSI equal to 2.0 hp/in2, the bit hydraulic contribution 4 SPE 116667 reduces from 22% to 9% when the WOB increases from 20,000 lb to 40,000 lb. This reduction on the bit hydraulic contribution could explain why all the data with HSI lower than 1.7 hp/in2 fits on the inefficient drilling region (High DSE and low ROP) on Fig. 3. Fig. 10 shows the bit hydraulic contribution vs. ROP for the same WOB values mentioned on the previous paragraph. Fig. 10 shows that the relationship of bit hydraulic contribution and ROP is not linear; it is a power function. This means that the increment...
View Full Document

Ask a homework question - tutors are online