Baixe well control equations, tables, charts by dara othman e outras Notas de estudo em PDF para Engenharia de Petróleo, somente na Docsity! WELL CONTROL Equations Charts & Tables Written & Edited Dara Othman Drilling Wells 2 nd Kirkuk Oil Institute 2010-2011 WELL CONTROL EQUATIONS By Dara Osman H. Ali PAGE 2 OF 12 Drilling Wells Department 2nd 1. Pressure (psi) Force (lb) Area (in ) = psi 2 2. Pressure Gradient (psi/ft) P.G.( psi ft ) 0.052 Mud Weight (ppg)   3. Hydrostatic Pressure (psi) a. H.P.(psi) = 0.052 Mud Weight (ppg) True Vertical Depth, TVD (ft)   b. Mud Weight (ppg) = Hydrostatic Pressure (psi) 0.052 True Vertical Depth, TVD (ft) c. True Vertical Depth, TVD (ft) = Hydrostatic Pressure (psi) 0.052 Mud Weight (ppg) 4. Equivalent Density (ppg) Eq. Density (ppg) = Pressure (psi) 0.052 TVD (ft) 5. Formation Pressure (psi) Formation Pressure (psi) = Hydrostatic Pressure in Drill Pipe (psi) + SIDPP (psi) assuming shut-in well with BHP equalized with formation pressure 6. Density to Balance Formation (ppg) Kill Mud Weight, KMW (ppg) = SIDPP (psi) 0.052 TVD (ft) + Original Mud Weight (ppg)  WELL CONTROL EQUATIONS By Dara Osman H. Ali PAGE 5 OF 12 Drilling Wells Department 2nd 20. Annulus Capacity Factor (bbl/ft)         Capacity(bbl / ft) = Open Hole Diameter (in) - Pipe Outside Diameter (in) Capacity(bbl / ft) = Casing Inside Diameter (in) - Pipe Outside Diameter (in) 2 2 2 2 1029 1029 or 21. Pipe Displacement (bbl/ft) Disregarding tool joints.     Displacement(bbl / ft) = Pipe Outside Diameter (in) - Pipe Inside Diameter (in) 2 2 1029 22. Total Pipe Displacement Including Capacity (bbl/ft) Disregarding tool joints.   Displacement(bbl / ft) = Pipe Outside Diameter (in) 2 1029 23. Density of Kick( Type of Kick) (ppg) ( ) ppg Type gm/cc  3 = Gas = 0.12-0.46 3-9 = Mixture = 0.46-0.92 9-10 = Saltwater = 0.92-1.15 WELL CONTROL EQUATIONS By Dara Osman H. Ali PAGE 6 OF 12 Drilling Wells Department 2nd 24. Height of Influx (ft) Height(ft) = Pit Gain (bbl) Annulus Capacity Factor (bbl / ft) 25. Pressure Gradient of Influx (psi/ft) Bit on bottom. Influx Gradient(psi / ft) = Pressure Gradient of Mud (psi / ft) - SICP (psi) - SIDPP (psi) Height of Influx (ft)       26. New Pump Pressure (with new mud density) psi : ( ) ( ) ( ) ( ) 27. New Pump Pressure (with new pump rate) psi : ( ) ( ) ( ( ) ( ) ) 28. Maximum Allowable Mud Weight (ppg) : A: ( ) ( ) ( ) B: ( ) ( ) 29. Formation Break Down Pressure (psi) : ( ) 30. Speed of Migration Gas (ft/hr) ( ) WELL CONTROL EQUATIONS By Dara Osman H. Ali PAGE 7 OF 12 Drilling Wells Department 2nd 31. Rate of Kick Rise (ft/hr) Well Shut-In. R.O.R.(ft / hr) = Change in SICP (psi) 0.052 Mud Wt (ppg) Elapsed Time for Change in SICP (hr)   32. Weight per Foot of Drill Collars (lb/ft)     lbs / ft = 2.67 OD (in) ID (in) 2 2  33. Force (lb) Force(lbs) = Pressure (psi) Area (in ) 2 34. Area (in)   3.142 , 4 (in)Diameter )Area(in 2 2      35. Degrees API (@ 60oF) OAPI = 141.5 Specific Gravity - 131.5 36. Specific Gravity (@ 60oF) Specific Gravity = 141.5 API + 131.5O 37. Mud Weight from Specific Gravity (ppg) Mud Weight(ppg) Specific Gravity ppg  833. (Fresh Water weighs 8.33 ppg) WELL CONTROL EQUATIONS By Dara Osman H. Ali PAGE 10 OF 12 Drilling Wells Department 2nd VOLUMETRIC CONTROL EQUATIONS 44. Pressure Increment, PI (psi) PI = Safety Factor (psi) = psi 3 45. Fluid Increment, MI (bbl) MI = PI (psi) Annulus Capacity Factor (bbl / ft) 0.052 Mud Wt (ppg ) = bbl   46. Rate of Bubble Rise, ROR (ft/hr) See Equation 25 above. ROR = Change in Casing Pressure (psi) 0.052 Mud Wt (ppg) Elapsed Time for Change (hr) = ft hr  47. Time to Bubble Penetration, BPT (hr) BPT = Depth of Bubble (ft) - Depth of Bit (ft) ROR (ft / hr) + Stripping Speed (ft / hr) = hr LUBRICATE AND BLEED 48. Pressure that can be bled off after lubricating in a given volume of fluid, (psi) Volume Lubricated (bbl) 0.052 Fluid Wt (ppg) Capacity Factor (bbl / ft) = psi  WELL CONTROL EQUATIONS By Dara Osman H. Ali PAGE 11 OF 12 Drilling Wells Department 2nd STRIPPING AND SNUBBING EQUATIONS STRIPPING 49. Pressure-Area Force, Fp (lb)   Fp     OD (in) Well Head Pressure (psi) 2 4 50. Buoyed Weight of Tubulars, W (lb) W WAIR        (lb) Mud Wt (ppg)65 4 65 4 . . 51. Barrels to Bleed per Stand, (bbls/stand)   BBL / Stand OD (in) 1029 Stand Length (ft) 2   52. Volumetric Control Considerations Pressure Increment, PI (psi) See Equation 37 above. Fluid Increment, MI (bbl) See Equation 38 above. Surface Pressure Increase due to Penetration of the Bubble, SPINCR (psi)    L L PG PG psiK DP OH K OH MUD GAS( ) ( )     Open Hole Kick Length, LK(OH) (ft) LK OH( )  Kick Volume at penetration (bbl) ACF (bbl / ft)OH DP by Hole Kick Length, LK(DPOH) (ft) LK DP OH( )   Kick Volume at penetration (bbl) ACF (bbl / ft)DP OH Rate of Bubble Rise, ROR (ft/hr) See Equation 40 above. Time of Bubble Penetration, BPT (hrs) See Equation 41 above. WELL CONTROL EQUATIONS By Dara Osman H. Ali PAGE 12 OF 12 Drilling Wells Department 2nd SNUBBING 53. Snub Force, SF (lb) SF Fp  Friction Force W 54. Neutral Point SF Fp 0; W 55. Effective String Weight, WE (lb/ft) W W (lb) L (ft) E (lb / ft)  56. Calculating Effective String Weight and Change in Effective String Weight after Filling a) Effective String Weight with no fluid in the workstring:   WE (Effective String Wt, lb / ft) Air Wt (lb / ft) OD (in) Fluid Wt (ppg)WELL    2 24 5. Note that WE and Air Wt both have units of lb/ft. For example, the air weight of 2-7/8” tubing normally would be 6.5 lb/ft. b) Increase in the Effective String Weight after the pipe is filled with the same Fluid Weight that is in the well:   W ID in E (lb / ft) Fluid Wt (ppg)WELL  ( ) . 2 24 5 c) Increase in the Effective String Weight after the pipe is filled with a different Fluid Weight than the Fluid Weight that is in the well:   W ID in E (lb / ft) Fluid Wt (ppg)FILL  ( ) . 2 24 5 d) After filling the pipe, the Effective String Weight will be: WELL CONTROL EQUATIONS By Dara Osman H. Ali PAGE 15 OF 12 Drilling Wells Department 2nd Notes WELL CONTROL EQUATIONS By Dara Osman H. Ali PAGE 16 OF 12 Drilling Wells Department 2nd Term symbol انًصطهر Annular , Annulus تدىيف انجئر Annular Pressure Losses APL فمذاٌ انضغط في انفراغ انسهمي Area A انًسبزخ Barrel bbl ثرييم Blowout اَفدبر انجئر Blowout Preventer يبَع اَفدبر Bottom hole Pressure BHP ضغط لعر انجئر Capacity انسعخ Casing CSG انجطبَخ Casing Shoe TVD انعًك انى زذوح انجطبَخ Circulating Time )زيٍ انذورح )انتذوير Density D, ρ انكثبفخ Density Of Kick(Type Of Kick) كثبفخ انرفسخ )َىع انرفسخ( Displacement االزازخ Drill Collar D.C أَجىة تثميم Drill Pipe D.P أَجىة زفر Drill String Internal Volume زدى خيط انسفر انذاخهي Drillstem Test D.S.T انفسص انطجمي Equivalent Circulating Density ECD انكثبفخ انًكبفئخ نهتذوير Equivalent Mud Weight Eq. MW كثبفخ انطيٍ انًكبفئخ Factor عبيم Final Circulating Pressure FCP ضغط انتذوير انُهبئي Foot ft لذو Force F لىح Formation Pressure ضغط انطجمخ Gas غبز Height L ارتفبع Hour Hr سبعخ Hydrostatic Pressure Phy ضغط انهيذروستبتيكي WELL CONTROL EQUATIONS By Dara Osman H. Ali PAGE 17 OF 12 Drilling Wells Department 2nd Influx انًبئع انًتذفك Initial Circulating Pressure ICP ضغط انتذوير االثتذائي Kick رفسخ Kill Mud Weight KMW كثبفخ انمتم Kilograms per Cubic Meter Kg/ كيهىغراو نكم يتر يكعت Kilograms per Liter Kg/l كيهىغراو نكم نتر Leak-Off Mud Weight LOMW كثبفخ انتسرة Leak-Off Pressure LOP ضغط انتسرة Leak-Off Test LOT فسص انتسرة Length L طىل Liner Inside Diameter Liner ID لطر االسطىاَخ انذاخهي Liner Outside Diameter Liner OD لطر االسطىاَخ انخبرخي Logging While Drilling LWD Maximum Allowable Annular Surface Pressure MAASP ألصى ضغط سطسي نهتدىيف انًسًىذ ثه Maximum Initial Shut-In Casing Pressure MISICP ألصى ضغط غهك اثتذائي نهجطبَخ Migration , صعىدهدرح Minute min دليمخ Mixture خهيط Mud Weight M.W ٍكثبفخ طي Non-Return Valve NRV صًبو الرخعخ Open Hole تدىيف يفتىذ Original Mud Weight OMW كثبفخ انطيٍ االصهيخ Pit Gain ٌانسيبدح في انخسا Pound per Gallon PPG ٌثبوَذ نكم كبنى Pound per Square Inch Psi ثبوَذ نكم اَح يرثع Pressure P ضغط Pressure Gradient P.G تذرج انضغط Pump Output Q يعذل انتذفك Rate Of Penetration ROP يعذل االختراق Saltwater يبء يهسي