2014 SPE European Artificial Lift Forum (EuALF)

Aberdeen, Scotland

17–18th June, 2014

Production optimization of ESP wells in Iraq Rumaila oilfield

Presenter - Peter O. Oyewole, SPE,

BP

(Subsurface ESP Team Leader)

Presentation Objectives

• To introduce Rumaila ESP application and the “unconventional”

optimization strategy, workflow process and case history

• To share knowledge, lesson learnt and results (that might be valuable

for other operators)

• To obtain any feedback for further improvement

3

• Introduction

• ESP Optimization Challenge in Rumaila

• ESP Optimization Strategy & Workflow Process

• Constant Pressure Control Mode (PID loop)

• Case Histories & Examples

• Results

• The Future - Real Time Data Application on Rumaila ESP

• Discussion, Questions & Comments

Content

Rumaila Field

4

• JV – (BP, CNPC, SOMO) =

Rumaila Operating

Organization in 2009

• ~ 1000 Wells (Active/Non-

Active Producer & Injectors)

Rumaila Field

5

• Simple Single Anticline

• 3 Main Reservoirs (Main Pay; Upper Shale; Mishrif)

• Early cretaceous deltaics system (series of stacked sandstone

interbedded the lower cretaceous carbonate System

• Field Area Coverage = 70km X 14km

• Rumaila/W.Qurna Structure --- >100Billion bbl STOIIP

Reservoir & Fluid Properties

• “ESP Perfect

Application”

• High Rate (1-10mbd)

• Low to No Solid Production

• Low to Moderate GOR (400-

850 SCF/STB)

• Oil Gravity (27-34 API)

• Low Viscous Fluid (< 2cp)

• Reservoir depth (2200-

3300m)

• Water Cut (0-60%)

• Moderate (Mishrif) to High

Permeability(Main Pay)

6

ESP Current Overview

Currently >230 mbd

(~20%) of Total

Field Production

(25%) of Active

Producer Wells

Growing # of ESP

and ESP Oil

Production

7

ESP Optimization & Operations Strategy

• High Range Operating Envelop (managing uncertainty)

– Operate in Downthrust (if required)

– No Upthrust

• Bias

- Fully Open Choke (where applicable)

- Low frequency operation

- Low Motor Loading (50 -80%) – Motor Loading Range %

- Managing Gas in Low PI wells – GS, AGH/GPU, HZ, Choke, Stages

- Moderate Over-stage

ESP Optimization Challenge in Rumaila

• Flow Rate & Water Cut (WC) Measurement availability and frequency??

• Flow Rate & Water Cut Measurement Accuracy??

• Common Industrial Practice - Flow Rate & WC is known and use to perform ESP Optimization and Intervention

• How do you perform ESP Optimization and Intervention without known flow rate & WC?

• How will you understand well and ESP performance?

• How do you perform monitoring and troubleshooting?

• Additional requirement to provide accurate ESP well rate into Production Allocation

ESP Optimization Strategy & Workflow Process

• Effective ESP Well Performance Modelling - Nodal Analysis (SubPump & PROSPER)

• Flow Test & Fluid Sample Calibrated Models (subject to availability)

• Trouble shooting and understanding discrepancy

• Accurate Input Data

• Timely Data Acquisition (Weekly Update)

• Data Quantity Control

• Data Quality Control

• Perform Trend Analysis (Short Term & Long Term Trends)

• (See flow chart on the next slide)

Surveillance

Optimisation

1. Weekly

Monitoring Field

Data

4. Data

Variation

Check

6. Run ESP

Performance

Model

New WT Data & Wkly

OPS Monitoring Report

8. Long

Term Trend

Analysis

3. Short

Term Trend

Analysis

2. Weekly Datalog

Download

11. ESP Well

Allocation

(SS Prod. Opt.)

12. Optimization

Request

(to Ops ESP

Coord.)

Choke Change

Freq. Change

PID Loop (Parameter Change)

WT Request

Sample Request

PBU Request

Yellow Flag Active Monitoring

ESP Monitoring & Optimization

Workflow Process

Vendor Field Ops

Emerson data

OFM

Derived Rate &

Estim. WC

7. Yellow-Flag

Trouble Wells

13. Perform

Optimization

(Ops ESP

Coordinator)

9. Evaluation

& Analysis

(with Vendor)

10. Weekly ESP

Summary

Report

5. ESP Optimization

Master Sheet

Update

14. Update

Optimization

Tracking

(+ Gain/Loss)

Update of Daily

Entry/Ops report

(Wellwork)

Constant Pressure Control Mode (PID loop)

• ESP Wells VSD Control Modes - 3 Modes

• Value of Constant Pressure Control Mode in Rumaila ESP Application

– Managing BHFP near Saturation Pressure

– Maximize optimization gain

– Reduce wellsite visit and intervention (safety)

– Reduce human error

– Timely response to reservoir inflow performance

Function Operating Value

High speed clamp 45 Hz

Low speed clamp 40 Hz

Target PIP 1900 PSI

Low threshold 1650 PSI

Proportional 3.00%

Derivative 0.00%

Integral 3.00%

THP (WHP) 220 PSI

Choke Setting Size 24

Case 1 : Performance vs SOR estimation

Case SBHP

(psi)

PI

(bpd/psi)

WC

(%)

THP

(psi)

Fr.

(Hz)

Intake Press

(psi)

Flow rate

(bpd)

Motor Load

(%)

Expected case 3800 1.5 5 600 55 2072 2600 53

Stable Performance 3750 1.2 0 190 45 1900 1900 36

13

Pump Curves (Design) Pump Curves (Actual)

14

THP/psig

FLP/psig

PIP/psi

Pd/psi

Choke//64

Tm/℃

Freq./Hz

MA/amps

Constant

BHFP

Case 1- PID Loop (Constant Pressure Mode)

Case 2- Hole in Tubing

PIP after Optz PIP b4 Optz

Case 3 – Pre & Post Optimization

Case 4- Decreasing PIP & Norm FG

Case 5- Increasing Norm. FG & WC

19

Realtime data from RTU (Rumaila Future)

Before and after optimization (stable flow)

• The Future - Real Time Data Application on Rumaila ESP

2012 ESP Optimization Skin

12 MBD Annualized Rate

52 Optimization Interventions

Questions

• Comments?

• Feedback?

• Input?

• Discussion?

• What else?

QUESTIONS

Acknowledgement

Rumaila (ROO) ESP Subsurface & Operations team

Rumaila (ROO) Subsurface Team Management

BP