7.0 Drilling Slim Wells

5/20/2018 7.0 Drilling Slim Wells

1/44

DEA 2006(e) 7 8 Sept D Dupuis

1

Drilling Slim Wells

3rd Quarter 2006 DEA(e) Sept 7&8th


2/44

2

Agenda

Historic

Aim

Problematic (Challenges)

Development-Achievement 1990-1997

Experience

Conclusions


3/44

3

Historic

1950s Early experience

Mining technology Transposition from mineral formations to sedimentary

formation

Value of core

Difficulties

Retrofit system

Adaptation of conventional Technology


4/44

4

Historic 1950s

Rising development costs are recognized as one ofthe major problems facing the oil industry today. Tocombat this situation, several new concepts designed to improvedrilling techniques have been advanced within recent years. Among

the ideas proving most effective is slim hole drilling. Carter's slim hole experience has been in both exploration and pool

development wells. In addition, slim hole practices have beensuccessfully applied to water injection wells. In comparison withstandard operations, both penetration rate and bit life decreased

using slim hole methods. No difficulty was encountered in coring,logging and testing in reduced diameter holes. Actual slim holecosts indicated a significant economic advantage over conventionalpractices. Savings in dry hole costs ranged up to 25 per cent,primarily from reductions in footage and day work rates. Additionalsavings accrued in producing wells from economy in tubulargoods. Slim hole methods may not always be applicable, asconsideration should be given to specific drilling problems andobjectives. In many cases, however, slim hole drilling providessignificant economic advantages over conventional practices.


5/44

5

Historic Mining Technology

Coring system deriving from mining industry use ofrods

Focussing on geological evaluation and based uponcontinuous coring of the formation

Development of site core evaluation logging process

Difficulties Kick control and mud window

Leaders AMOCO BP


6/44

6

Historic Retrofit System

Based on destructive drilling scale down of hole size

Use of conventional rig

Drilling methodology: use of small PDM and

Thrusters (sliding mode)

Wire line log to evaluate formations

Few records, cost of BHA


7/44

7

Historic


8/44

8

Historic (Elf Forasol)

Taking advantage of above experience development

of a specific system taking of above experience and

fitted for purpose equipment

Destructive drilling as well as continuous coring

Integration of services;


9/44

9

Aim

Reduce cost

Obtain data and production

Reduce environmental impact


10/44

10

Problematic and challenges

Minimum Final hole diameters, intermediate phases


11/44

11



12/44

12


Drilling

Ad-equation hole diameter tubular dimension

Pulling torque

Hydraulic ECD (monitoring/ mud window) Monitoring of dril ling parameters

WOB especially

Kick detection

Kick control

Data acquisition

Coring, logging, testing

Environment Waste treatment on site, surface lay out reduced as much as

possible

Production

Reduced crew, Service integration


13/44

13

Achievement Drilling

Tubular


14/44

14

Achievement Drilling ECD


15/44

15

Achievement Drilling ECD mud window


16/44

16

Achievement Drilling Parameters


17/44

17

Achievement Drilling Kick detection


18/44

18

Achievement Drilling Kick control

Procedure

Same as conventional (drillers method ..)Upon alert (pit level, KDS.. Close immediately

well

Major kick was controlled as procedure withno problem


19/44

19

Achievement Data Acquisition


20/44

20

Achievement Data Acquisition Continuous coring


21/44

21


Wire line logging


22/44

22


Testing


23/44

23

Achievement Environment Lay out


24/44

24



25/44

25



26/44

26

Achievement Environment Waste treatment


27/44

27

Achievement Production


28/44

28



29/44

29



30/44

30

Achievement services integration

Destructive drill ing and continuous coring

Integrated monitoring of dril ling parameters

Integrated waste control

Integrated cementing operation


31/44

31

Experience


32/44

32

Experience ELF (TOTAL)Last dri ll ing phase 3 3/8


33/44

33

Experience ELF (TOTAL)


34/44

34


Last dri ll ing phase 4


35/44

35




36/44

36



3 geological side tracks

R S


37/44

37

Experience Rumania Shell

Last dri lling phase 4

TVD 3000m

E i R i Sh ll


38/44

38


Last dri lling phase 4

TVD 3000m

E i R i Sh ll


39/44

39


Geological evaluation in 4 drilling phase

Wire line coring 2 size Good as a full size core

Wireline logging

Complete range of exploration tool run successfully

Log quality exceptionally good

Difficult ies to make interpretation RFT (repeatabil ity)

One fishing job with the Side Wall Sample Gun (Side wall Gun)

Cuttings analysis

Size and quantity sufficient, low gas reading

Well testing

Conducted in 4 liner without any problem

A l i C l i


40/44

40

Analysis Conclusion

Drilling

ROP similar to conventional, even in some

occasion better

ECD, ad-equation string OD- hole diameter: key

element, narrow mud window prospect eliminateslim hole drill ing

Environment benefit is more than obvious

A l i C l i


41/44

41

Analysis Conclusion

Geological evaluation

Satisfactory (except for RFT and side core)

Production

Up to 500 m3 slimhole wells can be used as

producer, versus a standard well the productionis reduced of 10%

Economy

Up to 50 % see next d ia

A l i C l i


42/44

42

Analysis Conclusion

47 %

62 %

48 %

18 %

53 %

Conclusion


43/44

43

Conclusion

What went wrong ???

Technical success

Viable economically

No commercial development !!!Or back in 50s

Slim hole methods may not always be applicable, asconsideration should be given to specific dril lingproblems and objectives. In many cases, however,slim hole drill ing provides signif icant economic

advantages over conventional practices

Thanks Questions

References


44/44

44

References

7.0 Drilling Slim Wells

Documents

Transcript of 7.0 Drilling Slim Wells