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By J W Hendry

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Duplex @ 90% efficiency) Annulus hole size = 8-1/2 in. 0583 bbl/ft (8-1/2 in. ) NOTE: The material pumped down the drill pipe was noticed coming over the shaker after 2680 strokes. 0657 bbl/ft Depth of washout = 4569 ft 15. 0 ppg 55 Formulas and Calculations 16. Stuck Pipe Calculations Determine the feet of free pipe and the free point constant Method 1 The depth at which the pipe is stuck and the number of feet of free pipe can be estimated by the drill pipe stretch table below and the following formula.

Pressure Required to Break Circulation Pressure required to overcome the mud’s gel strength inside the drill string Pgs = (y ÷ 300 ÷ d) L where Pgs = pressure required to break gel strength, psi y = 10 mm gel strength of drilling fluid, lb/100 sq ft d = inside diameter of drill pipe, in. 276 in. 5 psi Therefore, approximately 94 psi would be required to break circulation. 61 Formulas and Calculations Pressure required to overcome the mud’s gel strength in the annulus Pgs = y ÷ [300 (Dh, in. )] x L where Pgs = pressure required to break gel strength, psi L = length of drill string, ft y = 10 mm.

0 lb/gal. 65. 0 lb/gal Field cement additive calculations When bentonite is to be pre-hydrated, the amount of bentonite added is calculated based on the total amount of mixing water used. 23 Formulas and Calculations Table 2-1 (continued) Water Requirements and Specific Gravity of Common Cement Additives Lumnite Cement Trinity Lite-weight Cement Bentonite Calcium Carbonate Powder Calcium Chloride Cal-Seal (Gypsum Cement) CFR-l CFR-2 D-Air-1 D-Air-2 Diacel A Diacel D Diacel LWL Gilsonite Halad-9 Halad 14 HR-4 HR-5 HR-7 HR-12 HR-15 Hydrated Lime Hydromite Iron Carbonate LA-2 Latex NF-D Perlite regular Perlite 6 Pozmix A Salt (NaCI) Sand Ottawa Silica flour Coarse silica Spacer sperse Spacer mix (liquid) Tuf Additive No.

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