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

Transcription

1 The Barrel Chasing project TAQA s methodology for improving base well performance Guido van Yperen Wouter Botermans, Willem-Jan Plug, Simon Vroemen 25 September th European Gas Well Deliquification Conference Name Surname, Abu Dhabi, August Non-Deal Roadshow Presentation 0

2 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.

3 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.

4 Present Issues 26 wells 3

5 1. Analyse Production Data 2. Analyse Well History & Completion 3. Construct Well Performance Curve 4. Determine Liquid Loading Regime 5. Find Bottleneck 6. Propose Solutions 7. Estimate Gains & Rank Methodology 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 Identify problem area in wellbore or production network Focus on problem area Consider list of possible re-mediations Rank on Urgency, Costs, Expected gain, Chance of Success and Simplicity of Solution.

6 1. Analyse Production Data 2. Analyse Well and Field Data 3. Construct Well Performance Curve 4. Determine Liquid Loading Regime 5. Find Bottleneck 6. Propose Solutions 7. Estimate Gains & Rank Methodology Use day-to-day production experience 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 Identify problem area in wellbore or production network Focus on problem area Consider list of possible re-mediations Rank on Urgency, Costs, Expected gain, Chance of Success and Simplicity of Solution.

7 Step 1: Analysis of Production Behaviour Example: P/15-09E1 Well P/15-9E WHT \\pinoffspi001\pi-1215.pv 1.71 MPag \\pinoffspi001\t I-1211.pv 9.88 C \\pinoffspi001\pic-1215.out \\pinoffspi001\fi-3021.pv 0.01 e6sm3d 1.2 WHP Qgas /08/ :21: days THP WH-1201 GAS WH1 TEMP P15E WH-R01 top press 15E GAS FLOW Production Behaviour: Clear indications of Liquid Loading 24/08/ :42:03

8 1. Analyse Production Data 2. Analyse Well and Field Data 3. Construct Well Performance Curve 4. Determine Liquid Loading Regime 5. Find Bottleneck 6. Propose Solutions 7. Rank Solutions Methodology Identify current production problems and Identify anomalies on decline curve Discover historic well problems Identify potential problem area s Understand and describe changes in historical P-Q curves Construct Tubing and Liner Turner Liquid Loading Curves Identify problem area in wellbore or production network Focus on problem area Consider list of possible re-mediations Rank on Urgency, Costs, Expected gain, Chance of Success and Simplicity of Solution.

9 Step 2: Analysis of well history and completion Example: P/15-09E1 Production history shows perfect decline 5-1/2 Tubing 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 35 m distance perfs perf.joint 7 Liner Name Surname, Abu Dhabi, August Non-Deal Roadshow Presentation TAQA Barrel Chasing Project, EGWDC Groningen, 25 Sept 2012

10 1. Analyse Production Data 2. Analyse Well and Field Data 3. Construct Well Performance Curve 4. Determine Liquid Loading Regime 5. Find Bottleneck 6. Propose Solutions 7. Estimate Gains & Rank Methodology 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 Identify problem area in wellbore or production network Focus on problem area Consider list of possible re-mediations Rank on Urgency, Costs, Expected gain, Chance of Success and Simplicity of Solution.

11 Step 3/4: Construction of P-Q curve, Liquid Loading Example: P/15-09E1 Wel Performance Curves Suction Pressure Reduction Tubing Turner liquid loading curve (fixed) Liner Turner liquid loading curves (dep. on BHP)

12 1. Analyse Production Data 2. Analyse Well and Field Data 3. Construct Well Performance Curve 4. Determine Liquid Loading Regime 5. Find Bottleneck 6. Propose Solutions 7. Estimate Gains & Rank Methodology 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 Identify problem area in wellbore or production network Focus on problem area Consider list of possible re-mediations Rank on Urgency, Costs, Expected gain, Chance of Success and Simplicity of Solution.

13 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 until perfs. 2) Foam in well 3) Foam in pipeline or P/15-D riser

14 1. Analyse Production Data 2. Analyse Well and Field Data 3. Construct Well Performance Curve 4. Determine Liquid Loading Regime 5. Find Bottleneck 6. Propose Solutions 7. Estimate Gains & Rank Methodology 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 Identify problem area in wellbore or production network Focus on problem area Consider list of possible re-mediations Rank on Urgency, Costs, Expected gain, Chance of Success and Simplicity of Solution.

15 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

16 Preliminary Outcomes - Preferred Options First Choice Second Choice 15

17 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 16

18 The Barrel Chasing Project Other Examples Name Surname, Abu Dhabi, August Non-Deal Roadshow Presentation

19 P/15-15A1: Tailpipe Extension Key Figures: GIIP = 0.57 BCM Pres = 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 Liquid column Improved inflow Analysis: - Large liquid volumes (LGR = ~800 m3/mln Nm3) - Water Salinity = 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)

20 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 Distance perf-teg = 27 m 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

21 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 Distance perf-teg = 11 m 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)

22 The Barrel Chasing Project QUESTIONS? Name TAQA Surname, Barrel Chasing Abu Dhabi, Project, August EGWDC Groningen, Non-Deal 25 Roadshow Sept 2012 Presentation 21