the barrel chasing project eg… · non-deal roadshow presentation the barrel chasing project...

Name Surname, Abu Dhabi, August 2012. Non-Deal Roadshow Presentation www.taqaglobal.com

The Barrel Chasing project TAQA’s methodology for improving base well performance

0 0 Name Surname, Abu Dhabi, August 2012. Non-Deal Roadshow Presentation www.taqaglobal.com

Guido van Yperen Wouter Botermans, Willem-Jan Plug, Simon Vroemen

25 September 2012

7th European Gas Well Deliquification Conference


The Objective

The objective: Increase the production from the existing wells in the asset with 2.5-5%.

Why:

The majority of the TAQA Energy gas asset portfolio contains many

fields that are approaching end of field life. As a consequence many

wells are performing sub-optimal.

Problems: Liquid loading, start-up problems, water ingression, skin increase, etc. Approach: Look at available data. Analyze the well performance of wells and try to improve the bottleneck in a well. Carry out well re-mediations.

TAQA Barrel Chasing Project, EGWDC Groningen, 25 Sept 2012


Techniques to Consider

De-liquification techniques:

Foam injection (batch or capillary string)

Tailpipe extension

Velocity string

Gas-lifting

Plunger lifting

Wellhead pumps

(Wellhead) Compression

Other techniques

Re-perforation

Water shut-off

Acidizing

Scale inhibitor injection

Etc.



Present Issues – 26 wells

3 TAQA Barrel Chasing Project, EGWDC Groningen, 25 Sept 2012


Methodology


1. Analyse Production

Data

2. Analyse Well History

& Completion

3. Construct Well

Performance Curve

4. Determine Liquid

Loading Regime

6. Propose Solutions

7. Estimate Gains &

Rank

Identify current production problems and

Identify anomalies on decline curve

Identify potential problem area’s

View historic well problems

Understand and describe changes

in historical P-Q curves

Construct Tubing and Liner Turner Liquid Loading

Curves

Rank on Urgency, Costs, Expected gain,

Chance of Success and Simplicity of Solution.

5. Find Bottleneck Identify problem area in wellbore or production

network

Focus on problem area

Consider list of possible re-mediations


Methodology



Data

2. Analyse Well and

Field Data

3. Construct Well

Performance Curve

4. Determine Liquid

Loading Regime


7. Estimate Gains &

Rank

• Use day-to-day production experience

• Identify anomalies on decline curve






Curves




network




Step 1: Analysis of Production Behaviour Example: P/15-09E1

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THP WH-1201 GAS WH1 TEMP P15E WH-R01 top press 15E GAS FLOW

24/08/2012 04:42:0305/08/2012 07:21:11 18.89 days

Well P/15-9E1

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0.2

0.4

0.6

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1.2

1.4

1.6

1.8

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0

100

0

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WHP

Qgas

WHT

Production Behaviour:

Clear indications of

Liquid Loading



Methodology



Data

2. Analyse Well and

Field Data

3. Construct Well

Performance Curve

4. Determine Liquid

Loading Regime


7. Rank Solutions



• Discover historic well problems

• Identify potential problem area’s




Curves




network



Name Surname, Abu Dhabi, August 2012. Non-Deal Roadshow Presentation www.taqaglobal.com TAQA Barrel Chasing Project, EGWDC Groningen, 25 Sept 2012

Step 2: Analysis of well history and completion Example: P/15-09E1

7” Liner

5-1/2” Tubing

35 m distance

perfs – perf.joint

GIIP = 4.0 BCM

Current RF = 94%

Pres = 21.5 Bara

Qgas = 100 kNm3/d

CGR = 70 m3/mln Nm3 (dropping out in pipeline)

Water Salinity = 1700 ppm (probably no salt scaling)

1% extra RF means 40 mln Nm3

Production history shows perfect decline


Methodology



Data

2. Analyse Well and

Field Data

3. Construct Well

Performance Curve

4. Determine Liquid

Loading Regime


7. Estimate Gains &

Rank





• Understand and describe changes


• Construct Tubing and Liner Turner Liquid

Loading Curves




network



Name Surname, Abu Dhabi, August 2012. Non-Deal Roadshow Presentation www.taqaglobal.com TAQA Barrel Chasing Project, EGWDC Groningen, 25 Sept 2012 TAQA Barrel Chasing Project, EGWDC Groningen, 25 Sept 2012

Step 3/4: Construction of P-Q curve, Liquid Loading Example: P/15-09E1

Tubing Turner

liquid loading curve

(fixed)

Liner Turner liquid

loading curves

(dep. on BHP)

Wel Performance Curves

Suction Pressure

Reduction


Methodology



Data

2. Analyse Well and

Field Data

3. Construct Well

Performance Curve

4. Determine Liquid

Loading Regime


7. Estimate Gains &

Rank








Curves



5. Find Bottleneck • Identify problem area in wellbore or production

network

• Focus on problem area

• Consider list of possible re-mediations

Name Surname, Abu Dhabi, August 2012. Non-Deal Roadshow Presentation www.taqaglobal.com TAQA Barrel Chasing Project, EGWDC Groningen, 25 Sept 2012 TAQA Barrel Chasing Project, EGWDC Groningen, 25 Sept 2012

Step 5/6: Problem and Solutions Example: P/15-09E1

• Problem: Liquid Loading

• Analysis:

– well performance stayed the same (no skin increase or water influx).

– The tubing is large 5-1/2”, water loads in the tubing.

– Well dependent on FTHP, tackle liquid problems in the pipeline or riser.

• Solutions Considered:

1) Velocity string 3.5 - 2.5” until perfs.

2) Foam in well

3) Foam in pipeline or P/15-D riser


Methodology



Data

2. Analyse Well and

Field Data

3. Construct Well

Performance Curve

4. Determine Liquid

Loading Regime


7. Estimate Gains &

Rank








Curves

• Rank on Urgency, Costs, Expected gain, Chance

of Success and Simplicity of Solution.


network




Step 7: Ranking of wells

Rough Estimates (~Appraise Phase):

Costs of Well work

Incremental production (Rate, uptime and duration)

Chances of Success

1st Pass ranking of well work:

Urgency: High, medium, low

Unit Cost €/m3

Size of the Prize: how much potential left in field (“3P”)

Structural Solution preferred above Temporary

Simplicity of Solution



Preliminary Outcomes - Preferred Options


First

Choice

Second

Choice


Next Phase

• Further investigate options.

• Focus on up to 15 jobs

• If best option does not make it, second best option will be

evaluated

• Narrow down estimations of costs, benefits, practice etc

• Work out detailed plans with well engineering department

• Search for synergies and group well work in campaigns



The Barrel Chasing Project

Other Examples


P/15-15A1: Tailpipe Extension

Key Figures:

GIIP = 0.57 BCM

Pres = 138.5 Bara

Qgas = 60 kNm3/d

Current RF = 35%

Current Qgas = 60 kNm3/d

TBG = 3 1/2”

Liner = 7”

Distance perf-TEG = 27 m

Formation fracked

Issue: start up problems after shut-ins

Analysis:

- Large liquid volumes (LGR = ~800 m3/mln Nm3)

- Water Salinity = 70.000 ppm (high, formation water)

- P/z indicates large drop after frac

- Clear signs of changed productivity on THP-Q plot

Shut off water or improve lifting

Considered Options:

1. Tailpipe Extension

2. Water Shut-Off (cement, plug, polymers)

Liquid

column

Improved

inflow


P/15-14s (and -12s): Foaming via methanol line

Key Figures:

GIIP = 0.8 BCM

Pres = 72 Bara

Qgas = 30 kNm3/d

Current RF = 79%

TBG = 2 7/8”

Liner = 7”


Issue: Liquid Loading

Analysis:

- Large liquid volumes and high salinity (formation water)

- P/z indicates upward deviation (aquifer?)

- WSO not successful and expensive!! (reduction in productivity)

- Clear signs of decreased productivity on THP-Q plot

Improve lifting Considered Options:

1. Foam through methanol line (JIP project)

2. Foam via capstring

3. Re-install tailpipe extension


P/15-17A3: Water Shut-Off

Key Figures:

GIIP = 0.26 BCM

Pres = 86 Bara

Qgas = 20 kNm3/d

Current RF = 83%

TBG = 3 1/2”

Liner = 7”


Issue: start up problems

Analysis:

- MPLT indicated water influx

- Field map shows large exposure to aquifer

- Aquifer not seen on P/z plot

- Clear reduction of productivity seen on THP-Q plot

Start-up is blocked by liquid column

Considered Options:

1. Water shut-off, plug above Volpriehausen

2. Foam (batch or capillary string)


The Barrel Chasing Project

21 21 Name Surname, Abu Dhabi, August 2012. Non-Deal Roadshow Presentation www.taqaglobal.com

QUESTIONS?


the barrel chasing project eg… · non-deal roadshow presentation the barrel chasing project...

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