PETE 411 Well Drilling

50
1 PETE 411 Well Drilling Lesson 26 * Well Control * * Variable Geometry *

description

PETE 411 Well Drilling. Lesson 26 * Well Control * * Variable Geometry *. Well Control-Variable Geometry. Initial Shut-In Conditions Driller’s Method Kick at Casing Seat Kick at Surface Wait and Weight Method Kick at Casing Seat Kick at Surface. - PowerPoint PPT Presentation

Transcript of PETE 411 Well Drilling

Page 1: PETE 411 Well Drilling

1

PETE 411Well Drilling

Lesson 26* Well Control *

* Variable Geometry *

Page 2: PETE 411 Well Drilling

2

Well Control-Variable Geometry

Initial Shut-In Conditions

Driller’s Method Kick at Casing Seat

Kick at Surface

Wait and Weight Method Kick at Casing Seat

Kick at Surface

Page 3: PETE 411 Well Drilling

3

Read:Applied Drilling Engineering, Ch. 4

Quiz B Thursday, Nov. 14, 7 - 9 p.m. Rm. 101

Closed Book1 Equation sheet allowed, 8 1/2”x 11” (both sides)

HW #14: Driller’s Method - due 11-11-02 HW #15: W&W Method - due 11-15-02

Page 4: PETE 411 Well Drilling

4

Example Problem

1. Determine the pressure at the casing seat at 4,000’ when using the old mud

(Driller’s) versus using the kill mud (Wait and Weight) to circulate a gas kick out of the hole.

2. Determine the casing pressure at the surface when the top of the gas bubble has just reached the surface, for the same two mud weights used above.

Page 5: PETE 411 Well Drilling

5

Example Problem

Well depth = 10,000’

Hole size = 10.5”

Drill pipe = 4.5”, 16.60 #/ft

Drill Collars = 8” * 3.5” * 500 ft Surface casing = 4,000’, 13-3/8”, 68 #/ft

Mud Weight = 10 ppg

Fracture gradient @ 4,000’ = 0.7 psi/ft

Page 6: PETE 411 Well Drilling

6

Example Problem

Shut in Annulus Pressure, SICP = 400 psi

Shut in Drillpipe Pressure, SIDPP = 200 psi

Pit level increase = 20 barrels (kick size)

Drop the Z terms but consider Temperature

T at surface = 70 deg. F

Temperature gradient = 1.2 deg.F/100 ft

Page 7: PETE 411 Well Drilling

7

Initial (Closed-In) Conditions:

/gal#10 WeightMud Initial

bbl 20 Increase Level Pit

psi 400 SICP

psi 200 SIDPP

Initial mud gradient = 0.520 psi/ft

(0.052 * 10 = 0.520)

Page 8: PETE 411 Well Drilling

8

Initial (Closed-In) Conditions:

Pressure, Hole Bottom

psi 5,400)ft

psi520.0(*)ft 000,10(200P10,000

Collars, Drill outside Vol/ft Annular

gal 42

bbl

in 231

gal)in 12(in)85.10(

4v

2222

DC_Ann

bbl/ft 04493.0VDC_Ann ( 20.28 ft/bbl )

Page 9: PETE 411 Well Drilling

9

4,000’

9,500’

10,000’

vdp.csg = 0.13006 bbl/ft

vdc,hole = 0.04493 bbl/ft

vdp,hole = 0.08743 bbl/ft

Page 10: PETE 411 Well Drilling

10

Fluid, Kick ofHeight

ft 445bbl/ft 0.04493

bbl 20h 10,000

Fluid, Kick across Pressure cHydrostati

555,9*520.0400400,5P 0kick_10,00

psi 4 31.P 0kick_10,00

Annulus,the in csHydrostati

0kick_10,00P 9,555 * 0.520 400 5,400

Page 11: PETE 411 Well Drilling

11

Driller’s Method - kick at bottom

F = P * A = W

(2)--- PPPBHP MAK00 ΔΔ

area * PressureFluid Kick of Weight

2222

in)85.10(4

*in

lb31.4

lb 1,141 W

Page 12: PETE 411 Well Drilling

12

4,000’

9,500’

10,000’

9,555’

PB = P 10,000 = 5,400 psi

445’

SIDPP = 200 psiSICP = 400 psi

31.4psi

Page 13: PETE 411 Well Drilling

13

Driller’s Method - kick at csg. seat

What is the pressure at 4,000 ft when the top of the kick fluid first reaches that point?

4,0004,000 P

1,098,444h

650

4604870*

P

5,400*20h*0.08743

4,0004,000

10,000

4,000

4,000

10,00010,0004,000 T

T*

P

P*V V

Page 14: PETE 411 Well Drilling

14

4,000’

9,500’

10,000’

Driller’s Method

Top of Kick at Casing

Seat

P = 5,400 psi

Page 15: PETE 411 Well Drilling

15

Driller’s Method - kick at csg. seat

Again,

in4.510.54

lbs 1,141

area

weightP

22K_4,000

π

MAK_4,0004,000 PPPBHP ΔΔ

P K_4,000 = 16.1 psi

Page 16: PETE 411 Well Drilling

16

Driller’s Method - kick at csg. seat

4,0004,000 P

1,098,444*(0.52)P2,264

4,0004,000 h*0.523,120P5,384

)h(6,000*0.5216P5,400 4,0004,000

MAK_4,0004,000 PPPBHP ΔΔ

Page 17: PETE 411 Well Drilling

17

Driller’s Method - kick at csg. seat

0.7 psi/ft 0.6233 psi 2,493 P4,000

2

571,191*42,2642,264P

0.52

4,000

0571,191P 2,264P 4,00024,000

This results in the quadratic Eqn:

With the solutions:

Page 18: PETE 411 Well Drilling

18

Driller’s Method - Top of Kick at Casing Seat

4,000’

9,500’

10,000’

BHP = 5,400 psi

P4,000 = 2,493 psi

h4,000 = 441 ftP = 16 psi

4,0004,000 P

1,098,444h

P0,ann = ?

Page 19: PETE 411 Well Drilling

19

4,000’

9,500’

10,000’

Driller’s Method

Top of Kick at Surface

We need two equations…

P0 = ?

BHP = 5,400 psi

Page 20: PETE 411 Well Drilling

20

Driller’s Method - kick at surface

When the bubble rises, it expands. The volume of the bubble at the surface is given by:

(1)--- P

084,677h

o0

46012070

46070

P

540020h)13006.0(

00

000,10

0

0

000,10000,100 T

T

P

PVV (Z = const.)

Page 21: PETE 411 Well Drilling

21

Driller’s Method - kick at surface

psi 1110.85P K0 Δ

222K,0

in 4.512.4154

lb 1,141

area

weightP

π

Δ

Page 22: PETE 411 Well Drilling

22

Driller’s Method - kick at surface

From Eq. (2),

But, from Eq. (1),0

0

00

P

677,084h

)h(10,000*0.5211P5,400

MAK00 PPPBHP ΔΔ

Page 23: PETE 411 Well Drilling

23

Driller’s Method - kick at surface

0084,352P189P 02

0

Quadratic equation . . .

352,084PP115,2005,400 200

00 P

677,08410,0000.5211P5,400

So,MAK00 PPPBHP ΔΔ

Page 24: PETE 411 Well Drilling

24

Driller’s Method - kick at surface

2

)084,352)(4(189189P

2

12

0

psi 695psi 34.695P0

ft 974 h0

74.97334.695

084,677h0

4,000’

9,500’

10,000’

Page 25: PETE 411 Well Drilling

25

Driller’s Method - kick at surface

psi 2,280

111,574695

P974)(4,000*0.52PP KO04,000

Δ

psi 2,280

3,120-5,400

)000,4000,10(*)52.0(PP

,elyAlternativ

000,104,000

( = 0.57 psi/ft )

4,000’

9,500’

10,000’

Page 26: PETE 411 Well Drilling

26

Driller’s Method. Top of Kick at Surface

4,000’

9,500’

10,000’

h0 = 974 ftPK,0 = 11 psi

P0,ann = 695 psi

P 4,000 = 2,280 psi

P10,000 = ?

Page 27: PETE 411 Well Drilling

27

Calculate the pressure at 4,000 ft when the top of the bubble reaches this point.

Volume of bubble at 4,000 ft

Wait and Weight Method- kick at casing seat

10,000

4,000

4,000

10,00010,0004,000 T

T

P

PV V

Page 28: PETE 411 Well Drilling

28

Wait and Weight Method

Top of Kick at Casing

Seat

Kill Mud

Old Mud

4,000’

9,500’

10,000’

BHP = 5,400 psi

Page 29: PETE 411 Well Drilling

29

W&W - Pressure at top of kick at 4,000 ft

650

578

P

5,40020h(0.08743)

4,0004,000

10,000

4,000

4,000

10,00010,0004,000 T

T

P

PV V

(7)--- ΔPΔPΔPPBHP M1MK_4,0004,000

(6)--- P

1,098,444h

4,0004,000

Also,

Page 30: PETE 411 Well Drilling

30

Wait and Weight Method - kick at surface

Capacity inside drill string

= DP_cap. + DC_cap.

bubble. thebelow mud gal

# 10.0 ofQuantity

bbl 141

ft 500*ft

bbl0.0119ft 9,500*

ft

bbl0.01422

4,000’

9,500’

10,000’

BHP = 5,400 psi

Page 31: PETE 411 Well Drilling

31

W&W - Pressure at top of kick - kick at 4,000 ft

bbl/ft 0.08743

bbl 141*10*052.0P M

psi 839P M

psi 16P before, As K_4,000

10,000 * 0.052

SIDPP Wt.Mud Old MudKill of Density

gal

# 10.380.3810.00 KWM

Page 32: PETE 411 Well Drilling

32

W&W - Pressure at top of kick - kick at 4,000 ft

4,0004,000

4,000M1

h(0.5398)2,36883916P5,400

0.08743

141h6,000*10.38*0.052ΔP

ΔPΔPΔPPBHP M1MK_4,0004,000

Page 33: PETE 411 Well Drilling

33

W&W - Pressure at top of kick - kick at 4,000 ft

4,000000 4 P

1,098,444(0.5398)P2,177

0592,940P 2,177P 4,00024,000

2

940,592 * 4177,2177,2P

5,02

000,4

psi/ft 0.61 psi 2,422 P 4,000

Page 34: PETE 411 Well Drilling

34

4,000’

9,500’

10,000’

Wait and Weight Method

Top of Kick at Surface

Kill Mud

Old Mud

Page 35: PETE 411 Well Drilling

35

Wait and Weight Method - kick at surface

Volume of gas bubble at surface:

10,000

0

0

10,00010,0000 T

T

P

PV V

650

530

P

5,40020h*0.13006

00

P

677,084h

00

Page 36: PETE 411 Well Drilling

36

Wait and Weight Method (Engineer’s Method) - kick at surface

Assume all 10 lb/gal mud is inside the 13 3/8” csg. Then the height of 10 lb mud:

M1MK0010,000 PPPPP ΔΔΔ

ft 1,084 bbl/ft0.13006

bbl 141.0h M

psi 11P K,0 ΔAs before,

Page 37: PETE 411 Well Drilling

37

Wait and Weight Method (Engineer’s Method) - kick at surface

psi 564 1,084*10*0.052ΔPM

Hydrostatic head across the mud columns:

Old Mud:

Kill Mud:

1,084)h(10,000*10.38*0.052P 01M

Page 38: PETE 411 Well Drilling

38

Hydrostatics in Annulus W&W Method - kick at surface

00

00

M1MK0010,000

h(0.5398)P12.14

)h(8,916*0.539856411P5,400

ΔPΔPΔPPP

Page 39: PETE 411 Well Drilling

39

Wait and Weight Method kick at surface

psi 611 610.59 P

2

365,490 * 41212P

0365,49012PP

P

677,084(0.5398)P12

0

2

1 2

0

020

00

From Eq. 4, substituting for h0

Page 40: PETE 411 Well Drilling

40

Height of Bubble at Surface

ft 1,109

610.59

677,084

P

677,084h

00

Wait and Weight Method- kick at surface

Page 41: PETE 411 Well Drilling

41

Check Pressure at 4,000 ft- kick at surface

psi/ft 0.54 psi 2,161

1,093)-1,109-(4,000* 10.38*0.052

56911611

ΔPΔPΔPPP M1MK004,000

Looks OK

Page 42: PETE 411 Well Drilling

42

Wait and Weight MethodTop of Kick at Surface

Kill Mud

Old Mud

4,000’

9,500’

10,000’

h0 = 1,109 ftPK,0 = 11 psi

P0,ann = 611 psi

P 4,000 = 2,161 psi

P10,000 = ?

POld Mud = 569 psi

Page 43: PETE 411 Well Drilling

43

Summary

Driller’s Engineer’sMethod Method

Bubble at 10,000 ft

400 400 P

2,480 2,480 P

0

4,000

Page 44: PETE 411 Well Drilling

44

Summary

Driller’s Engineer’sMethod Method

Top of Bubble at 4,000 ft

342 413 P

2,422 2,493 P

0

4,000

Page 45: PETE 411 Well Drilling

45

Summary

Driller’s Engineer’sMethod Method

Top of Bubble at surface

611 695 P

2,161 2,280 P

0

4,000

Page 46: PETE 411 Well Drilling

46

Page 47: PETE 411 Well Drilling

47

Why the difference?

Page 48: PETE 411 Well Drilling

48

Wait and Weight Method

Kick Intensity, ppg

Max

imu

m C

asin

g P

ress

ure

, p

si

Page 49: PETE 411 Well Drilling

49

Cas

ing

Pre

ssu

re,

psi

Pump Strokes

Kick Intensity, ppg

Page 50: PETE 411 Well Drilling

50

Cas

ing

Pre

ssu

re,

psi

Volume of Mud Pumped, bbl