Comparative Analysis of Production Method with PCP Systems at Rubiales Oil Field (Colombia) SPE

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Comparative Analysis of Production Method with PCP Systems at Rubiales Oil Field (Colombia) SPE - 114191 C. A. Rubio P.

1 Comparative Analysis of Production Method with PCP Systems at Rubiales Oil Field (Colombia) SPE C. A. Rubio P. A. Agudelo: Weatherford Colombia Limited J. E. Peñaloza: Meta Petroleum Limited Houston TX, April 2008 SPE PCP Conference

2 Table of Contents 1. Objectives. 2. General Context Rubiales Oilfield. 3. Typical Completions (PCP & ESP). 4. Historical Behavior of Oil Production. 5. Operation Parameters Behavior (PCP & ESP). and BS&W 6. Comparison: RB-31(PCP) vs. RB-45 and RB-47 (ESP). 7. Power Requirements ESP vs. PCP. 8. Conclusions.

3 Objectives Compare artificial lift systems at Rubiales oilfield (PCP vs. ESP) into wells behavior. Show the advantages and disadvantages that can offer each kind of artificial lift method. Establish the best alternative to produce Rubiales oilfield ensuring the minimum bottom draw down and warranting stable production conditions. (BS&W).

4 General Context Rubiales Oilfield Llanos Orientales Colombian Basin (Paleozoic Upper Tertiary). South East Region of the country. Average BS&W: 81% Oil Gravity ( API): 60 F Average Production Depth: 2500 (762 m) 33 Production Wells, 9 with PCP Systems and 24 with ESP Systems.

5 Typical Completion PCP Production String Drivehead with Electric Motor Polished Rod Sucker Rod String Tubing String Tubular PCP Stator and Rotor (5 Bbls/RPM/Day 2200 psi) Non Turn Anchor Gravel Pack

6 Typical Completion ESP Production String RTE:16' 236' 9 5/8" CSG SHOE 3390' QUANTUM PACKER 3400' 7" CSG SHOE Hanger FEPCO TUBING BONNET FEPCO MASTER VALVE. FEPCO PUMPING TEE FEPCO SWAB VALVE. FEPCO WING VALVE. FEPCO TREE CAP Tubing String SBL-REDA VSD: SPEEDSTAR, 2000 TM, 390 KVA, NEMA 3R 6 PULSE, 460 V, CKT BREAKER R3A420KCB. SBL-REDA TRANSFORMER: 400 KVA, ABB, VBT=480 Volt. VAT = Volt. 3 a 90 Hz, 20 Taps 7-1/16" x 3 1/8" psi 3 1/8" x 3000 psi WP THREADED 3" LP 3 * 3" LP. Drain Valve (Bleeder Valve) 3 1/8" x 3000 psi WP THREADED 3" LP 3 1/8" x 3000 psi WP THREADED 3" LP 3 1/2" x 3 1/8" ACME psi WP /2" 11,6 #/FT P-110 BTC BLANK PIPE #REF! #REF! 79,30 5, X-OVER 5" BTC BOX x 4 1/2" LTC PIN #REF! #REF! 0,58 5, /2" LTC MESH RITE 11,6 #/FT #REF! #REF! 887,33 5, X-OVER 4 1/2" LTC BOX x 4 1/2" BTC PIN #REF! #REF! 0,54 5, STINGER SEAL #REF! #REF! 0,97 5, JOINT 4 1/2" BTC 11,6 #/FT, P-110 #REF! #REF! 9,68 4, WASH DOWN SHOE #REF! #REF! 2,10 5,00 Check Valve Discharge Head Pump (70 stages average, BFPD) COMPLETION FLUID : FILTERED BRINE (KCl) DENSITY (PPG) : 8,5 PPG FORMATION INTERVALS THICK (ft) SPF GUN TYPE BASALES SANDS 3418' MD ' MD > 46' TVD N.A N.A Intake CSG # JTS DESCRIPTION SHOE (ft) COLLAR(ft) TOC (ft) 9 5/8" 5 K-55, 36#, BTC, R-III 236 N.A SURFACE 7" 68 N-80, 23 lb/ft, R-II, BTC REMARKS : HORIZONTAL HOLE REV. BY: I. AREVALO Motor Multisensor Type O 4 1/2" LTC MESH RITE 11,6 #/FT FROM 3490 FT TO 4377 FT Horizontal Well 4655'

7 Historical Behavior of Oil Production RUBIALES HISTORICAL BEHAVIOR OF OIL PRODUCTION Ago-2004 Feb-2005 Sep-2005 Mar-2006 Oct-2006 Abr-2007 Nov-2007 Jun-2008 Production drop due meteorologic contingence Time Oil Production (BOPD)

8 Pareto Diagram Oil Production PARETO DIAGRAM - OIL PRODUCTION % OIL PRODUCTION 23,197 BOPD 20% OIL PRODUCTION 6,095 PRODUCTION FORECAST RUBIALES OIL FIELD 29,292 BOPD RB-63 H RB-61 H RB-58 H RB-65 H RB-75 H RB-55 H RB-42H RB-62 H RB-54 H RB-67 H RB-64 H RB - 45H RB-68 H RB - 48H RB-60 H RB-57 H RB-59 H RB - 25 RB-66 H RB-43D RB - 33 RB - 04 RB-79 RB-51 H RB - 38 RB - 41 RB - 10 RB - 31 RB - 47 RB - 39 RB - 30 RB - 37 RB-44D BOPD WELLS 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% PCP Systems Wells

9 Operation Parameters of PCP Systems Wells RB-10 RB-30 RB-31 RB-33 RB-37 RB-38 RB-39 RB-41 RB-80 Velocity (RPM) Torque (%) Middle Point of Perforations (feet) Pump Intake Depth (feet) Total Liquid Column (feet) Depth of Level (feet) BFPD (Barrels of Fluid per Day) BS&W (%) BOPD (Barrels of Oil per Day) Volumetric Efficiency (%) PIP (psi) PWF (psi) Rubiales 31 Well: Since % BS&W (average) BFPD

10 BS&W Behavior PCP Wells BS&W BEHAVIOR - PCP WELLS RUBIALES OIL FIELD 120,00 100,00 80,00 BSW(%) 60,00 40,00 20,00 Lineal tendency with a soft slope. Stable conditions along the time 0,00 28-Jun Ene Ago Feb Sep Mar Oct Abr Nov Jun-08 Date RB-30 RB-33 RB-37 RB-38 RB-41

11 Operation Parameters of ESP Systems Wells RB-04 RB-025 RB-042H RB-043D RB-044D RB-045H RB-047 RB-048H RB-051 RB-054H RB-055H RB-057H Frecuency (Hz) Total Liquid Column (feet) Depth of Level (feet) BFPD (Barrels of Fluid per Day) BS&W (%) BOPD (Barrels of Oil per Day) PIP (psi) RB-058H RB-059H RB-060H RB-061H RB-062H RB-063H RB-064H RB-065H RB-066H RB-067H RB-068H RB-075H Frecuency (Hz) Total Liquid Column (feet) Depth of Level (feet) BFPD (Barrels of Fluid per Day) BS&W (%) BOPD (Barrels of Oil per Day) PIP (psi) Rubiales 45 Well: Since % BS&W (average) 1000 BOPD

12 BS&W Behavior ESP Wells BS&W BEHAVIOR - ESP WELLS RUBIALES OIL FIELD 100,00 90,00 80,00 70,00 60,00 BSW(%) 50,00 40,00 30,00 20,00 10,00 Strong slope in BS&W tendency 0,00 18-Ene Mar Abr Jun Ago Sep Nov Ene Feb-08 Date RB-54H RB-60H RB-62H RB-64H

13 Comparison: BS&W Behavior RB-31 and RB-45 Wells BSW Behavior - RB-31 and RB-45 Wells 120,00 100,00 80,00 60,00 40,00 20,00 0,00 7-ago sep oct-03 5-dic ene feb-04 3-abr may jun-04 1-ago sep oct nov-04 8-ene feb mar-05 8-may jun jul-05 5-sep oct nov-05 3-ene feb mar-06 3-may jun jul ago oct nov dic-06 7-feb mar abr-07 7-jun jul ago-07 5-oct nov dic-07 2-feb mar abr-08 1-jun-08 BS&W Skin on wellbore due organic treatment Fastly increase of BS&W tendency (3 months approx.) 16 months keeping the "same" value of BS&W Time RB-31 RB - 45 Shut off due meteorological contingence (june 2007)

14 80,00 75,00 70,00 65,00 60,00 55,00 50,00 45,00 40,00 35,00 30,00 25,00 20,00 Rubiales - 47 Well FREQUENCY VS BS&W - RB-47 WELL 19/02/ /03/ /04/ /05/ /06/ /07/ /08/ /09/ /10/ /11/ /12/ /01/ /02/ /03/ /04/ /05/ /06/ /07/ /08/ /09/ /10/ /11/ /12/2007 DATE /01/2006 BS&W (%) - FREQ (Hz) BFPD-BOPD- PIP BSW RPM O HZ BFPD BOPD PIP BS&W Tendency during 2006

15 Diesel Requirements to ESP Systems WELL Hz ENGINE MODEL NOMINAL KVA PRIME MODE NOMINAL KW PRIME MODE DIESEL REQUIRED TO ESP SYSTEMS - RUBIALES OILFIELD PHASE VOLTAGE (VOLTS) PHASE CURRENT (AMPERES) CONS. DIESEL (GAL/DAY) A-B B-C A-C A B C RB ,0 NT855-G ,1 102,93 41,17 34,70 219, ,6 82,43 789,17 RB-042H 45,0 NT855-G ,4 195,85 78,34 57,44 364, ,9 83, ,60 RB-043D 41,0 NT855-G ,7 82,17 32,87 29,61 187, ,76 557,21 RB-044D 35,0 NT855-G ,9 42,39 16,96 19,88 126,04 241,5 74,62 61,29 RB-045H 51,0 NT855-G ,7 132,31 52,92 41,89 265, , ,18 RB ,0 NT855-G ,4 29,23 11,69 16,65 105,60 290,2 41,15 170,78 RB-048H 56,0 NT855-G ,4 171,17 68,47 51,40 325, ,9 83, ,97 RB ,0 NT855-G ,5 207,86 83,15 60,38 382, ,3 83, ,48 RB ,0 NT855-G ,2 96,20 38,48 33,05 209, ,8 88,57 837,68 RB ,0 NT855-G ,0 175,93 70,37 52,57 333, ,1 82,39 923,84 RB-060H 35,0 NT855-G ,3 77,57 31,03 28,49 180, ,03 707,33 RB-061H 38,0 NT855-G ,0 85,89 34,35 30,52 193, , ,67 RB-064H 38,0 NT855-G ,0 142,83 57,13 44,47 281, ,27 891,60 CONS. KVA CONS. KWATT S USED % LOAD DIESEL CONS. BFPD BSW BOPD Well Hz KVA Cons. Used Load (%) Diesel Cons. Diesel Cons. (gal/day) BFPD BS&W BOPD RB-47H 36 34,4 11,7 16,7 105, ,2 170,8

16 Diesel Requirements to PCP Systems POZO RPM s ENGINE MODEL NOMINAL KVA PRIME MODE NOMINAL KW PRIME MODE DIESEL REQUIREMENTS TO PCP SYSTEMS INPUT VOLTAGE (VOLTS) CURRENT (AMPERES) CONS. KVA CONS. KW USED %LOAD DIESEL CONS. (L/HR) DIESEL CONS. (GAL/DAY) BFPD BSW BOPD RB BT3,9-G ,58 31,09 56,53 10,96 69, ,1 81,11 194,21 RB BT3,9-G ,06 20,45 37,18 8,41 53,31 646,4 88,29 75,69 RB BT3,9-G ,72 34,61 62,93 11,81 74,86 298, ,97 RB BT3,9-G ,96 27,16 49,39 10,02 63, ,9 66,77 414,68 RB BT3,9-G ,07 33,21 60,39 11,47 72,73 488,6 74,46 124,79 RB BT3,9-G ,53 25,95 47,19 9,73 61, ,5 72,46 308,86 RB BT3,9-G ,14 17,97 32,67 7,81 49,53 788,8 80,85 151,06 RB BT3,9-G ,75 25,29 45,98 9,57 60, ,2 71,17 307,96 RB BT3,9-G ,38 27,52 50,04 10,11 64,07 525,5 47,37 276,57 Well RPM KVA Cons. Used Load (%) Diesel Cons. Diesel Cons. (gal/day) BFPD BS&W BOPD RB ,7 62,9 11,8 74,9 298,

17 Conclusions PCP s at Rubiales oilfield have permitted to keep the production conditions in the wells that have this kind of artificial lift system in comparison with ESP s. With PCP systems can ensure better production development of the wells and bigger productivity life of them. PCP completions are appropriate to be installed in horizontal or deviated wells with the Rubiales typical configuration, according with completions of the present. At Rubiales oilfield there are some cases where it s possible to re-evaluate the artificial lift selected. PCP and ESP systems. To select a kind of artificial lift system it s very important to analyze power requirements to ensure save costs along the time.

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