Info

STROKES

The calculations for Figure 34 are as follows:-

1. Pressure Drop from A to B

Static drill pipe pressure drop to point (B) = SIDPP - (-x SIDPP )

2500

10000

Frictional pressure increase at point (B) = SCR UP RISER + 1-FCP-PSCR

V MD

2500 15000

x126 I =

  • 1050 + 21
  • 1071 psi

Pressure drop from A-> B = 1650 -> (1071 + 450) = 1650 psi -> 1521 psi

44.4 0.117

= 380 strokes

SECTION 5 : METHODS OF WELL CONTROL

2. Pressure drop from B to C

Static drill pipe pressure drop to point (C) = SIDPP - I-x SIDPP I

10000 /

Frictional pressure increase at point C = SCR + I -x AP SCR I

15000 /

x126 I = 1050+105 = 1155 psi i5000

Pressure drop from B to C = 1521 to 1155 psi Strokes from B to C = (12500 - 2500) x 0.01776 =

I- 1= 1518 strokes

Accumulative strokes = 380 + 1518 = 1898 strokes

3. Frictional pressure increase from point C to point D

Frictional pressure at C = 1155 psi Frictional pressure at D = 1176 psi

26.64

Strokes from C to D = (12500 - 14000) x 0.01776 = - = 228 strokes

0.117

0.117

296 strokes

Accumulative strokes to point D = 380 + 1518 + 296 = 2194 strokes r

SECTION 5 : METHODS OF WELL CONTROL

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