Geo Pressure Consulting Services

8/13/2019 Geo Pressure Consulting Services

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GPC GeoPressure Consulting Servicesfor Pore Pressure Evaluation

Lost-circulati zon

Rubble zon

Shallow o

Depleted zon

Wellbore instabili

Sloughing sha

Subsa

Overpressur formatio

Data management Integrated data systemsReal-time operations

Drilling optimization Electronic drilling recordersGeopressure consulting servicesH2S detection

Hole-stability monitoringKick detection

Underbalanced drilling Vibration detection

Formation evaluation Advanced formation gas analysis Formation cuttings analysis Geoscience consulting services Source rock analysis Wellsite geochemical analysis

Surface logging systems

mpletion

oduction

ervention

Drilling

aluation



added drilling efciency and safety

Understanding pore pressure and wellbore stability issues is essential to safe, efcient and

cost-effective drilling. Weatherford’s GeoPressure Consulting (GPC) services leverage the

knowledge and experience of leading professionals in the eld with advanced analysis and

prediction techniques. By assimilating, analyzing and interpreting mass volumes of data, our

GPC consultants not only provide a real-time overview of the current geopressure situation,they also enable well teams to “look ahead” at what pressure regimes will be like hundreds of

meters below the present drilling position. As a result, we have compiled an enviable success

rate of helping our clients meet drilling and geological targets while signicantly reducing risk,

nonproductive time (NPT) and related costs.

The GPC team helped a client reach the nal electric logging point 12 days ahead of scheduleand saved a casing string on an exploration well.

0

1,640

500

3,281

1,000

4,921

1,500

6,562

2,000

8,202

2,500

9,842

3,000

11,483

3,500

D

e p t h ( f t [ m ] , B R T )

Time/Depth Curve

Actual 1. Anchoring and positioning

2. Drill 36-in. hole to 863 ft (263 m)

3. Run and cement 30-in. casing conductor

4. Drill 26-in. hole to 2,372 ft (723 m)

5. Run and cement 20-in. casing – blowoutpreventer (BOP) tested

6. Drill 17-in. hole to 4,068 ft (1,240 m)

7. Run and cement 13 3/8-in. casing

8. Drill 12 1/4-in. hole to 8,314 ft (2,534 m)

9. Electric logging

10. BOP tested

11. Dr ill 12 1/4-in. hole to well TD8,773 ft (2,674 m)

12. Plugback

Plan A. Rig move

B. Anchoring and positioning

C. Prepare and drill 36-in. hole

D. Run and cement 30-in. casing conductor

E. Drill 26-in. hole

F. Run and cement 20-in. casing

G. Install 18 3/4-in. BOP and riser

H. Prepare and drill 17 1/2-in. hole

I. Run and cement 13 3/8-in. casing

J. Prepare and drill 12 1/4-in. hole

K. Electric logging

L. Run and cement 9 3/8-in. casing

M. Prepare and drill 8 1/2-in. hole

N. Electric logging

O. Plug and abandon

P. Prepare rig move Q. Recover anchors

R. Rig move – back

© 2010 Weatherford. All rights reserved.2



through expert geopressure consulting.

GPC: Experience the benets

Geopressure problems cost the E&P industry billions

of dollars each year. Clients of Weatherford’s GPC

services benet from lower cost, reduced risk and

greater drilling productivity, thanks to our accurate

pore pressure proling and our ability to quantify

the effects of geopressure-related factors during

the construction phase of a wellbore.

Reduce

▪ Risk (people and environment)

▪ Time to production

- Sidetracks - Casing strings

▪ NPT issues, including:

- Formation damage- Kicks and blowouts - Stuck pipe and tools

▪ AFE overruns

Improve

▪ Safety

▪ Operational efciency

▪ Crew competency

▪ Decision making

▪ Cost management

▪ Current and futureperformance

Weatherford’s GPC porepressure prediction services canbe combined with the wellborepressure prole control capabilityof the Secure DrillingSM services’Microux™ closed-loop controlsystem to provide unmatcheddrilling efciency while overcomingwellbore-pressure issues in eventhe most challenging—and in some

cases, previously undrillable—wells.

© 2010 Weatherford. All rights reserved.

GPC GeoPressure Consulting Services

3



with the r

During the well planning phase, GPC consultants

perform a predrilling assessment to predict

a well’s pore pressure and highlight potential

drilling hazards. Using real-time data, they

continually rene the predrill prognosis to conrm

the pressure point during drilling operations.

Once drilling is complete, the nal well report

includes geopressure curves generated for

the entire logged section of the well to improve

drilling efciency on subsequent wells.

With the right information delivered at the

right time, well teams can make and

implement performance-enhancing and

risk-reducing decisions.

Weatherford’s experienced geopressure

consultants are available 24/7/365 to

ensure timely dissemination of accurate

pore pressure proles that can help

well teams meet drilling and geological

targets quickly and safely.

Weatherford’s GPC consultants provide an array of

services before, during and after drilling to predict and

manage pore pressure. These services include assisting

in the selection of drilling mud, advising on measures

to remediate abnormally high pore pressure, identifyingfractures and advising on casing points.

Predict

Predrill pore pressure models are developed, based on

seismic information and data from offset wells.

Evaluate

GPC consultants closely monitor pore pressur

logging-while-drilling (LWD) resistivity data acq

while drilling and correlate the real-time data w

the predrill model.

GPC Pore Pressure Management Continuous Learning Loop

the right consultants

4 © 2010 Weatherford. All rights reserved.



formation at the right time.

Qualitative techniques

Working solely with quantitative data does not provide a complete picture of the pore-pressure

regime. Qualitative data such as gas-mud weight-rate of penetration (ROP) relationship,

produced gases, gas scenarios, temperature, cavings, lithology, geopressure proles, torque,

drag and ll are necessary to constrain normal compaction trend line drawings. By applying

proprietary, software-enabled measurement criteria to some of these qualitative data and

relationships, the GPC group has developed semi-quantitative techniques that make it

easier to cross-check the output from the qualitative side of pore pressure analysis.

Weatherford’s methodology leverages the cumulative knowledge and expertise of our

consultants’ years of experience to make our predictions accurate and replicable.

Additionally, most quantitative techniques are limited to normal faults and extensional

regimes which are likely to underestimate pore pressure in many of the world’s mostpromising basins. Weatherford’s GPC service integrates qualitative techniques to extend

the benets of geopressure prediction and determination to these basins.

Adjust

Using downhole and real-time data, GPC

consultants continually rene the pressure

prole to reduce uncertainty and enable

drillers to better control mud weights, dene

casing points and improve overall drilling

efciency and safety. The goal is to reduce

uncertainty, not only at the current depth,

but also ahead of the bit.

Advance

Continually predicting, evaluating and adjusting the pore pressure

prole to successfully manage pore pressure—throughout the well

construction process and from well to well—enables wells to be

drilled more safely and efciently, boreholes to be placed more

accurately, and reservoir contents to be evaluated and managed

for maximum oil and gas recovery.

The benets continue after drilling. Understanding pressures in

the reservoir ultimately impacts production and payout. Reservoir

engineers use pore pressure measurements gathered by GPC

consultants to identify and type uids, dene uid contacts and

assess reservoir continuity.

Drilling efciency and safety are continuously improved through continuous GPC pore pressure management, which integratespredrill, while-drilling and after-drilling knowledge and understanding of geopressure situations from one well to the next.

Quantitative analysis

Weatherford’s GPC services use

conventional quantitative techniques

to analyze geopressures prior to and

during drilling. Our GPC software

gathers drilling exponent corrected,

resistivity, sonic/interval velocity,

density and shale density data. We

apply industry-recognized methods

to analyze and model the data prior

to drilling. Similarly, our consultants

derive look-ahead pore and fracturepressure curves during drilling by

modifying the predrill model.


© 2010 Weatherford. All rights reserved. 5



Weatherford’s GPC services have proven effective in more than 100 wells throughout the world.

GPC clients are repeat clients, because they realize the benets that accrue from dramatically

improved drilling efciency and a signicant reduction in safety and environmental risks.

Confronted with drilling Tobago’s rst deepwater wells and with offset wells

56 mi (90 km) away, an operator chose Weatherford’s GPC to provide

predrill analysis and on-site determination and prediction leading

to considerable cost savings by eliminating NPT.

For an offshore operation

with a history of kicks and

stuck pipe and an average

NPT of one month per

drilling campaign, using

Weatherford’s GPChelped the operator

save US$8 million and

set the stage for further

improvements in well

construction efciency in

future exploration wells

in the area.

South Caspian: Slashing exploration time and cost

Trinidad and Tobago: Zero NPT on four deepwater wildcat wells

Real Results

GPC: Before and After

i

Repair Rig,54.75, 2%

Stuck Pipe,

658.75, 22%

Situation before GPC deployed

Repair Rig,

79.5, 4%

Fishing,

32.5, 2%

i i

i

Situation after GPC deployed

The GPC team helped to dramatically improve ROP and reduce costly NPT to a fraction of what ithad been on previous wells.

© 2010 Weatherford. All rights reserved.6



For an operator in the remote jungles of northeast

India, gathering complete and accurate pore pressure

data was essential to successfully drilling a well

where others had suffered a series of blowouts

and losses. The advice of the Weatherford GPC

consultant enabled the operator to modify the casing

plan in time to eliminate a 13 3/8-in. casing string

saving US$0.5 million.

GPC consultants correctly identied and overcame wellbore breathing incidents in a high-pressure/high-temperature

(HP/HT) well where previous kicks and ballooning had led to signicant NPT. The GPC consultants prevented a kick

in the pore pressure ramp and recommended a smaller bottomhole assembly (BHA), which enabled the operator tosuccessfully drill the HP/HT well with signicantly reduced NPT.

Pore pressure prole of the well showing produced gases at

the right with the higher produced gases indicating the zone

of severe ballooning.

Close up of the ballooning zone. Equivalent circulation

density and produced gases were dramatically reduced and

ballooning was mitigated when the BHA was changed per

GPC team recommendation.

India: Saving a casing string

Weatherford’s GeoPressure Consulting services enable

operators to obtain a realistic overview of geopressure

situations in real time. With this information, informeddecisions can be made in time to avoid costly problems

that can otherwise increase nonproductive drilling time

and compromise future production.

Southeast Asia: Overcoming wellbore breathing complications in an HP/HT well

© 2010 Weatherford. All rights reserved.


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the benets of faster, safer, more productive drilling today by contacting us at

[email protected], or by visiting weatherford.com.


weatherford.com

Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at weatherford.com. For more information contact an authorized Weatherford representative. Unlessnoted otherwise, trademarks and service marks herein are the property of Weatherford. Specications are subject to change without notice. Weatherford sells its products and services in accordance with the terms andconditions set forth in the applicable contract between Weatherford and the client.

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Geo Pressure Consulting Services