+ All Categories
Home > Documents > 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

Date post: 23-Dec-2015
Category:
Upload: joel-joseph
View: 290 times
Download: 24 times
Share this document with a friend
Popular Tags:
33
1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d
Transcript
Page 1: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

1

PETE 411Well Drilling

Lesson 25

Well Control, cont’d

Page 2: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

2

Well Control, cont’d

Shut-in Procedures after Taking a Kick Kick Occurs While Drilling Kick Occurs While Tripping

Casing Pressures During Well Control Operations

Kick on Bottom Kick at surface

Kick Migration During Shut-in Conditions Kicks on Trips/ Wellbore Fillup

Page 3: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

3

Read:

Applied Drilling Engineering, Ch.4

HW #14Well Control – Driller’s

due November 11, 2002

Page 4: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

4

Controlling A Kick when On Bottom

Procedure:

1. Raise the kelly to clear the tool jointabove the rotary

2. Shut down the pump

3. Check for well flow

Page 5: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

5

Controlling A Kick when On Bottom

4. If well is flowing, immediately close the blowout preventer and shut in the well completely, (except on shallow gas kicks).

5. Notify supervisory personnel.

6. Read and record the stabilized shut-in drill-pipe pressure. (SIDPP)

Page 6: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

6

Controlling A Kick When On Bottom

7. Read and record the stabilized shut-in casing pressure (SICP)

8. Read and record the pit gain (pit-level increase = kick size)

9. Record the time

10. Record depth

11. Record mud weight

Page 7: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

7

Controlling A Well Kick While Making A Trip

1. Stop trip operations. Set slips with tool joint at rotary.

2. Install inside blowout preventer and release valve stem or close the valve if drill-stem valve is employed.

Page 8: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

8

Controlling A Well Kick While Making A Trip

3. Immediately close the blowout preventer and shut in the well completely (except on shallow gas kicks).

4. Install kelly, open drill-pipe valve, or pump through back-pressure valve.

Page 9: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

9

Controlling a Well Kick While Making A Trip

5. Notify supervisory personnel

6. Read and record the stabilized shut-in drill-pipe pressure or equivalent (SIDPP)

7. Read and record the stabilized shut-in casing pressure (SICP)

Page 10: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

10

Controlling A Well Kick While Making A Trip

8. Read and record the pit gain (Kick Size)

9. Record the time

10. Record the current well depth

11. Record the current mud weight

Page 11: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

11

Variable Geometry

Kick On Bottom

- Well Shut In

4,000’

9,500’

10,000’

400 psi 200 psi

PB = 5,700 psi

hB = 445’

Page 12: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

12

1. Calculate new BHP:

2. Calculate height of kick (check geometry).

3. Calculate density of kill mud:

SIDPP)depth**052.0(P oldB

depth*052.0

PBkill

depth*052.0

SIDPP

Variable Geometry

Page 13: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

13

4. Calculate the density of kick fluid:

How would you derive this equation?

Variable Geometry

BMUDOLDKICK HeightKick*052.0

SIDPPSICP

BMUDOLDKICK HeightKick*052.0

SIDPPSICP

Page 14: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

14

Engineer’s Method -

Gas Kick at surface

SIDPP)depth**052.0(P oldB PB = const = 0.052 * kill * depth

Gas Bubble

10.0 lb/gal

10.38 lb/gal

ho

D*

Page 15: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

15

1. Calculate expansion

of gas bubble

B

x

B

x

x

BBx Z

Z

T

T

P

PVV

kill,mold,mKICKx PPPPBHP

Annulus PHYD, kick of at top PressBHP .2

2. BHP = Press at top of kick + P HYD,Annulus

3. Solve the resulting quadratic equation to get the pressure

Page 16: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

16BHP = PTOP + gi * hi gi = 0.052 * i

Page 17: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

17

Bubble Rise

Velocity?

GasBubble

Will Rise

!

Well is Shut In

Page 18: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

18

20 bbl kick

50 bbl kick

10 bbl kick

1,998 psi

1,266 psi

989 psi

CA

SIN

G P

RE

SS

UR

E,

psi

BARRELS OF KILL MUD PUMPED

Page 19: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

19

Well Control

Avoid kicks if possible

Catch them early if they do occur

Know how to control kicks if they do occur

Page 20: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

20

Avoiding Kicks While Tripping:

Keep the hole full.

Avoid excessive surge pressures.

Avoid excessive swab pressures

Page 21: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

21

Tripping Out of Hole

A good drilling engineer will always stay on the rig floor during the first 20 stands of a trip.

1. Make sure pipe is not pulled too fast.

2. Make sure annulus is kept full.

e.g. fill every 5 stands, and measure volume required to fill hole.

Page 22: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

22

Tripping Out Of Hole

If well is not taking enough fluid to replace volume of steel pulled from hole, fluid may have been swabbed into well.

Measure fluid volume to fill hole:

1. By counting pump strokes, or

2. By direct measurement from trip tank.

Note: The second method is best.

Page 23: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

23

Annular Fill-Up On Trips

Example 1

How much fill-up is required after pulling 5 stands of 5” OD, 19.5 #/ft drillpipe with extrahole tool joints?

[ Each stand is 93 ft long ].

Page 24: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

24

Annular Fill-Up On Trips

(i) Mud drains out through nozzles ………bbls

(steel only)

(ii) Nozzles are plugged ……… bbls (steel + mud)

Page 25: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

25

Page 26: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

26

Example

(i) Vol. of steel only: (nozzles not plugged)

From Table 1.6, actual weight in air is 20.60 lb/ft.

lbs 9,579

stds. 5*.std

ft93*

ft

lb20.60stds 5 of wt.

Page 27: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

27

Example

mud of bbls 3.48required up-Fill

bbls 3.48

gal 146.36

lbs/gal 45.65

lbs 579,9

density

wt.steel of Volume

Page 28: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

28

Example

Check: From Table 1.6,

)enough! (close

bbls 3.51

bbls stds 5 ft 90

ft 93 68.0ntDisplaceme

Page 29: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

29

Example

(ii) Nozzles are plugged:

From Halliburton book, internal capacity of 19.50 #/ft, 5” O.D. drillpipe is 0.01776 bbl/ft.

bbls 26.8

stds 5*std

ft93

ft

bbl0.01776capacity Total

Page 30: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

30

Example

Volume of fill-up req’d = 3.48 + 8.26

= 11.74 bbls

How much did the fluid level drop?

How much did the BHP drop?

Page 31: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

31

Recommendations

Fill hole after each 5 stands of drill pipe when coming out of hole.

Fill hole after each stand of drill collars when coming out of hole.

When GIH after an extended period of time, break circulation gradually, at several different depths...

Page 32: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

32

Recommendations

Do not break circulation with bit and BHA just above the casing seat.

When breaking circulation, Start the pumps slowly, Rotate the drill string, Pick up on the drillstring at the same time

This will reduce the initial pressure required to get the mud moving

Page 33: 1 PETE 411 Well Drilling Lesson 25 Well Control, cont’d.

33

MultiMedia Training Programs

To View these Programs on any Departmental Networked Computer:

1. Go to Network Neighbourhood

2. Select the computer marked “Juvkam-wold2”

3. The folder “Multimedia” contains TWELVE Multimedia Programs

Let me know if there are problems.


Recommended