أحجام البئر وزمن الدوران
Annular and string volumes section by section, then the strokes and the minutes to bottoms-up and to a full circulation.
الحفر
هيدروليك اللقمة واختيار الفوهات
Total flow area, nozzle pressure drop, HSI and jet impact force — plus the nozzle size that would put the optimum share of pump pressure at the bit.
يجري تحميل الحساب…
جرى هذا الحساب داخل متصفحك. لم يُرسل أي رقم أدخلته إلى أي جهة، ولم يُحفظ شيء.
كيف تُحسب
- TFA = Σ π(d/32)²/4 over the open nozzles.
- Bit pressure drop = ρQ²/(12042·Cd²·TFA²) in ppg, gpm and in².
- Nozzle velocity = 0.32086·Q/TFA (ft/s); impact force = ρ·Q·Vn/1930.4 (lbf); HSI = ΔPbit·Q/1714 divided by bit face area.
- Optimum sizes are back-solved from 65 % of standpipe pressure (maximum hydraulic horsepower) and 48 % (maximum impact force).
المعايير التي تتحدثها
أين تتوقف عن الصحة
The discharge coefficient is an assumption, not a measurement: 0.95 is right for a clean, round, new nozzle and wrong for a worn or partially plugged one, and the pressure drop goes as 1/Cd². A bit that has been on bottom for eighty hours is not this calculation. The optimum-share rules are also rules of thumb from roller-cone practice — on a PDC in a hard formation they are, at best, a starting point.
القدرة التي تؤتمت هذا العمل
- DR-01تحسين معدل الاختراق آنياًRate of penetration is how fast the bit makes hole. This recommends the weight and rotation speed that make it fastest without wrecking the bit.
- DR-06العزم والسحب والهيدروليكا آنياًCompares what the string should weigh and how hard the pumps should work against what is actually measured, and flags the gap.
أدوات ذات صلة
الكثافة المكافئة أثناء الدوران وضغط القاع
Annular pressure loss, flow regime and the equivalent circulating density the formation actually sees while the pumps are running.
المسح الاتجاهي — الانحناء الأدنى
Paste MD, inclination and azimuth and get TVD, northings, eastings, dogleg severity, vertical section and closure — with the well path drawn.
ورقة القتل — طريقة الحفار
Kill mud weight, initial and final circulating pressure and the step-down schedule, for rehearsal and for checking a sheet that has already been worked.
أداة تدريب