gdr results-omv nam santos for customer enhancement-gundrillreamer.pdf• drilling enhancement by...

1 terceloilfield.com PRIVATE AND CONFIDENTIAL1 terceloilfield.com PRIVATE AND CONFIDENTIAL

TERCEL OILFIELDDrilling Tools Technology

2 terceloilfield.com Private and ConfidentialPrivate and Confidential

A drilling enhancement tool equipped with PDC cutters on a

bevelled profile to help maintain gauge of wellbore.

Replaces conventional stabilizer and provides reaming through an integral blade design using tungsten carbide inserts (TCI).

Product Portfolio: Drilling Enhancement – GunDRILL™ Reamer

GDR is not an Under-reamer. GunDRILL™ Reamer is a Hole Conditioner and a POOH Insurance !!!


GunDRILL™ Reamer – Main Functions

Hole Cleaning

Unconsolidated

FormationsKey Seating

Ledges and

Doglegs

Mobile

Formations

Faulted

Formations

Reactive

Formations

Over-Pressured

Formations

Make it Better

4 terceloilfield.com Private and Confidential

Tercel Axi-symmetric cutter distribution for balanced micro-cutting and reduced vibrations

Chamfered blade for proper PDC cooling and cleaning

Tercel TCI distribution, optimized for uniformity of reamed surface and balanced insert wear

Tercel mud-ways, optimized to minimize

balling potential

360 degree blade coverage

GunDRILL™ Reamer - Features Make it Simple


GunDRILL™ Reamer - Benefits

• Enhance borehole quality by under-cutting/polishing ledges and tortuosities while drilling

Make it Happen


GunDRILL™ Reamer - Benefits

• Increased WOB transmission

• Reduced torque compared to the fixed blade stabilizers

• Security against sticking downhole, provided string can be rotated

• Re-opens holes to avoid having stuck pipe due to borehole problems

• Reduce NPT related to POOH and encountering heavy back reaming in mobile and transient formations

Make it Happen


GDR Detailed Post-Run Analysis

GDR Benefits, through hole conditioning improvement:

• While drilling– Smoothening the drilling response (reducing the MSE fluctuations)

– Improving the WOB transmission (decreasing the MDS fluctuations)

• While POOH– Facilitating the POOH and avoiding stucking pipe

– Increasing Reaming & Back-reaming efficiency

• While Running the casing– Increasing the Casing Running Speed


Illustration 1 - 7 7/8” Section (SANTOS-Australia)

Used the 7 5/8” directional GDR in more than 15 highly directional wells.


1.1. GDR added value: While Drilling

Mechanical Specific Energy (MSE): A Valuable Trending Tool for Drillers and Engineers !

2 2

4 480

Bit Bit

WOB TOB RPMMSE

D D ROPππππ⋅ ⋅ ⋅⋅ ⋅ ⋅⋅ ⋅ ⋅⋅ ⋅ ⋅= += += += +⋅ ⋅⋅ ⋅⋅ ⋅⋅ ⋅

MSE [Kpsi]

TOB [Klbs.ft]

WOB [Klbs]

ROP [ft/hr]

DBit [inch]

Where:

Mechanical Drilling Strength (MDS): How efficient is your WOB transmitted ?

10

Bit

RPM WOBMDS

D ROP⋅ ⋅⋅ ⋅⋅ ⋅⋅ ⋅====

⋅⋅⋅⋅

MDS [Kpsi]

WOB [Klbs]

ROP [ft/hr]

DBit [inch]

Where:



The main difference between

RM07-04-1 and RM07-04-2 wells

is the use of TERCEL GunDRILL

Reamer instead of the stabiliser.

The depth-based logs of the two

wells highlights that MSE

variation in RM07-04-2 presents

globally lower mean values

(higher drilling efficiency) than

those recorded on RM07-04-1.



0100200300400500600700800900

Average MSE (MPa)

RM09-04-1 RM09-09-4 RM09-05-1 RM09-05-2 RM09-05-3 RM09-05-4

0100200300400500600700800900

1000

MSE S.DEV (MPa)

RM09-04-1 RM09-09-4 RM09-05-1 RM09-05-2 RM09-05-3 RM09-05-4

The presence of the TERCEL GunDRILL Reamer reduced the fluctuations of specific energy,

smoothening the drilling process in almost all formations.



The MDS values variation

in both wells proves a

better WOB transmission

when using the GDR due to

a better borehole quality.



020406080

100120140160180

Average MDS (MPa)

RM09-04-1 RM09-09-4 RM09-05-1 RM09-05-2 RM09-05-3 RM09-05-4

0

50

100

150

200

250

MDS S.DEV (MPa)

RM09-04-1 RM09-09-4 RM09-05-1 RM09-05-2 RM09-05-3 RM09-05-4

The presence of the TERCEL GunDRILLReamer enhanced the WOB transmission,

proving a better borehole quality.


1.2. GDR added value: While POOH

Formation TopsLog

gin

g o

ps

Ca

sin

g

run

nin

g

Wip

er

Tri

p


1.4. Conclusions: GDR global added value

The use of GunDRILL Reamer enables total saving of

640 k$ in terms of Reaming/Back-reaming & Casing

Running Operations for only 11 wells.

The GunDRILL Reamer contributed on:

• Drilling Enhancement by reducing the MSE fluctuations, smoothening thedrilling process in almost all formations. It also contributes to a better WOBtransmission.

• Hole conditioning by smoothening the Pull Out process and shortening thereaming/back-reaming duration.

• Casing running by increasing the RIH speed due to optimal borehole quality.


Illustration 2 – 12 ¼’’ Section (NAM-Netherlands)

The two wells have similar

profiles (inclination and

azimuth).

DLS values are likely the

same in both wells from

804m to 2300m.

DLS values are greater in

BHM-7 than in BHM-7A from

2300m to TD.


2. BHM 7A – 12 ¼’’ Section - BHA #3

NB: Tercel GDR D00005 is 12 1/8’’ Gauge


This log summarizes the drilling parameters, the Specific Energy

and the DLS evolution in the pilot hole (red) and the side-track

well (green) in the same geomechanical environment, formation

tops depth matching has been applied taking BHM-7A as

reference. (full log in Appendix 5)

The main differences between the two wells are the use of

Steelseal mud instead of Baralube mud and the use of TERCEL

GunDRILL Reamer instead of the stabiliser.

The depth-based logs of the two wells highlights that:

• The two wells have the same profile (inclination and

azimuth).

• DLS values are greater in BHM-7 from 2300 m up to TD.

• Specific energy in BHM-7A presents smoother variation (less

peaks) and globally lower mean values (higher drilling

efficiency) than those recorded on BHM-7.

2.1. Drilling Enhancement: GDR added value - Illustration 2


1

2

3

The main differences between the two wells are the use of Steelseal mud instead of Baralube mud and the use of

TERCEL GunDRILL Reamer instead of the stabiliser.

The depth-based logs of the two wells highlights that specific energy in BHM-7A presents smoother evolution (less

peaks) and globally lower mean values (higher drilling efficiency) than those recorded on BHM-7.



The presence of the TERCEL GunDRILL Reamer reduced the fluctuations and the peaks of specific energy, smoothening

the drilling process in challenging intervals.



2.2. POOH Enhancement: GDR added value - Illustration 2

POOH BackReaming Torque in BHM-7A vs BHM7: Focus on Challenging drilling Interval 2

Smoother & Faster

BackReaming POOH


The presence of the TERCEL GunDRILL Reamer reduced POOH Torque values and

fluctuations, smoothening the Pull Out process in

challenging formations.

2.2. POOH Enhancement: GDR added value - Illustration 2


Tercel GunDRILL Reamer - Application benefits

The previous analysis leads to the following conclusion regarding the benefits of running

the GunDrill Reamer in Well BHM-7A – section 12 ¼’’:

While Drilling:

The presence of the TERCEL GunDRILL Reamer drastically reduced the fluctuations and

the peaks of specific energy, smoothening the drilling process in challenging intervals.

While POOH - backreaming:

• The use of GDR allowed NAM to backream and POOH despite hole cleaning / stability

issues.

• The presence of the TERCEL GunDRILL Reamer has helped to smoothen the wellbore

surface by reaming the existent tortuosities in problematic drilling interval 2 (from

1780m to 2020m).

Casing Running:

Casing was successfully run and cemented.


Illustration 3: Context – 16’’ Section (OMV-Tunisia)

WAHA SE-1 EL BADR-6


3. GDR Tool Pictures: EL BADR-6 _16” Section

General status:General status:General status:General status:

• Stabilizing area : Inserts slightly worn away (No OD measurement recorded)

• Back Reaming PDC cutting structure : Green

• Reaming PDC cutting structure : multiple broken PDC (No clear photos for better localisation)

• Blade : Green.

The global tool condition proves the GDR has reamed the borehole ledges and tortuosities.


3.1. Drilling Enhancement: GDR added value _ EL BADR-6

The main difference between WAHA SE-1 and EL

BADR-6 wells is the use of TERCEL GunDRILL Reamer

instead of the stabiliser.

The depth-based logs of the two wells (Appendix.12)

highlights that specific energy variation in EL BADR-6

presents globally lower mean values (higher drilling

efficiency) than those recorded on WAHA SE-1for

both 16” and 12¼” sections.

The S values variation in both wells proves a better

WOB transmission when using the GDR probably

due to a better borehole quality.

Important E-S fluctuations are experienced in

Abreghs and Adjadj highly interbedded formations,

resulting in severe drilling conditions in both wells

(E-S values spikes). Consequently, ROP was

controlled to avoid high torque fluctuations.



The presence of the TERCEL GunDRILL Reamer reduced the fluctuations of

specific energy, smoothening the drilling process in almost all

formations.

� With GDR

� Witout GDR



The presence of the TERCEL GunDRILL Reamer remarkably enhanced the WOB transmission, proving a better borehole quality.

� With GDR

� Witout GDR


3.2. Hole Conditioning : GDR added value _ EL BADR-6

The GunDRILL Reamer reduces NPT related to POOH and encountering heavy back reaming in mobile and

transient formations. Moreover, it helps decrease the total reaming/backreaming time resulting in important savings.

Using the time-based data we compute the total reaming/backreaming time for WAHA SE-1 (No GDR) and EL BADR-6

(With GDR in 16” and 12 ¼” sections) wells.

We have total reaming time gain of 401 mn and total backreaming time gain of 220 mn. The use of GunDRILL Reamer enables a total saving of 87,521$ for a mean daily cost of

202,948 $ in terms of reaming/backreaming operations.

� With GDR

� Witout GDR


3.3. Casing Running Speed : GDR added value _ EL BADR-6

By enhancing the borehole quality, the GunDRILL Reamer reduces NPT related to POOH and increases casing

running speed. In addition, having a better borehole quality guarantees an optimal cementing job.

Using the time-based data we compute the 13 3/8” and 9 5/8” casings running speed for WAHA SE-1 (No GDR) and EL

BADR-6 (With GDR in 16” and 12 ¼” sections) wells.

We have a global increase in casing running speed of 160 % in the 16” section and of 10 % in the 12 ¼” section . The use of GunDRILL Reamer enables a total saving of 173,943 $

for a mean daily cost of 202,948 $ in terms of casing running operations.

� With GDR

� Witout GDR


3.4. Conclusion: GDR global added value

The GunDRILL Reamer contributed on:

• DrillingDrillingDrillingDrilling EnhancementEnhancementEnhancementEnhancement by reducing the fluctuations of specific energy, smoothening the drillingprocess in almost all formations. In El-Badr-6, it also contributes to a better WOBtransmission.

• HoleHoleHoleHole conditioningconditioningconditioningconditioning by smoothening the Pull Out process and shortening thereaming/backreaming duration.

• CasingCasingCasingCasing runningrunningrunningrunning by increasing the RIH speed due to optimal borehole quality.

The use of GunDRILL Reamer enables saving of 261,464 $ in EL BADR-6 Well in term of Reaming/BackReaming & Casing Running

Operations

ELELELEL BADRBADRBADRBADR----6666

Drilling Enhancement Drilling Enhancement Drilling Enhancement Drilling Enhancement

Hole conditioning Hole conditioning Hole conditioning Hole conditioning

Casing running Casing running Casing running Casing running


TERCEL OILFIELDDrilling Tools Technology

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