Download Formulas and Calculations for Drilling, Production, and by William C. Lyons, Thomas Carter, Norton J. Lapeyrouse PDF

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In. sq. in. dimensionless stk stk stk stk stk stk stk stk Cr Cra Cs Csfp Csfpt Css D D1 D2 Dbit Dh Dhwo Di Dp Dpwo1 Dpwo2 Dtcmt DTV DLCO DP f2 Fd Formulas and Calculations for Drilling, Production, and Workover # 2012 Elsevier Inc. All rights reserved. 1). 1). 7 Strokes to Displace the Drill String, Annulus, and Total Circulation from the Rotary Table to the Flowline Cs ¼ Vs Op ð2:9Þ Where: Cs ¼ number of pump cycles or strokes for entire system Vs ¼ volume of system in bbl Op ¼ pump output in bbl/stroke (stk) Basic Calculations 47 Step 1: Calculate the strokes to pump down the drill string from rotary table to the bit:   573:9 Cds ¼ ¼ 5739 stk 0:100 Where: Cds ¼ cycles or strokes for inside the drill string Step 2: Calculate the strokes to pump up the annulus from the bit to the flow line: a) Open hole/drill collar annulus:   14:7 ¼ 147 stk Cdca ¼ 0:100 Where: Cdca ¼ cycles or strokes for open hole/drill collar annulus b) Open hole/heavy weight drill pipe annulus:   52:1 Chwdpa ¼ ¼ 5210 stk 0:100 Where: Chwdpa ¼ cycles or strokes for open hole/heavy weight drill pipe annulus c) Open hole/drill pipe annulus:   125:0 Cdpa ¼ ¼ 1250 stk 0:100 Where: Cdpa ¼ cycles or strokes for open hole/drill pipe annulus d) Casing/drill pipe annulus:   869:0 Cca ¼ ¼ 8690 stk 0:100 Where: Cca ¼ cycles or strokes for casing/drill pipe annulus 48 Formulas and Calculations for Drilling, Production, and Workover e) Riser/drill pipe annulus:   1516:8 Cra ¼ ¼ 15,168 stk 0:100 Where: Cra ¼ cycles or strokes for riser/drill pipe annulus f) Total strokes to circulate down the drill string and up the annulus: Ct ¼ ð5739Þ þ ð147 þ 5210 þ 1250 þ 8690 þ 15168Þ ¼ 36,204 stk g) Time to circulate the various sections: Tt ¼     5739 30,365 þ ¼ 172:4 min 210 210 Where: Tt ¼ total circulation time in minutes NOTE: When the booster pump is on, the strokes for the riser/drill pipe annulus increase.

26)):   Ws À Wm BF ¼ Ws Step 2: Calculate the maximum length of drill pipe that can be run into the hole with a specific BHA assembly: Á Á ÀÀ  ðTSÞð1 À f dp Þ À MOP À WBHA ðBFÞ L max ¼ ð2:28Þ Wdp Where: Lmax ¼ maximum length of drill pipe that can be run into the hole with a specific BHA in feet TS ¼ tensile strength for new drill pipe in lb fdp ¼ safety factor to correct new drill pipe to no. 5 Ton-Mile (TM) Calculations All types of ton-mile service should be calculated and recorded in order to obtain a true picture of the total service received from the rotary drilling line.

Above equation The above formula is an approximation because the factor “2” is a rounded-off number. To determine the exact factor, obtain two pressure readings at different pump rates and use the following formula. Factor ¼ logðpressure 1 Ä pressure 2Þ logðpump rate 1 Ä pump rate 2Þ Example: Pressure 1 ¼ 2500 psi @ 315 gpm Pressure 2 ¼ 450 psi @ 120 gpm Factor ¼ logð2500 psi þ 450 psiÞ logð315 gpm Ä 120 gpmÞ Factor ¼ logð5:555556Þ logð2:625Þ Factor ¼ 1:7768 Example: Same example as above but with correct factor.