MAASP Analysis with SEPAL - Well Surveillance Solution

1 About Us! 100% indigenous Petroleum Engineering Software Development & Consulting Company Providing Engineering Solutions for Oil & Gas upstream sector with focus on subsurface asset management Commenced Engineering Research in 2003 and commenced SEPAL WSS design in 2008 Seasoned Nigerian partners across the industry ©CypherCrescent Ltd.

2 Outline Overview of Well Surveillance Solution What is MAASP MAASP Calculation MAASP Reporting Benefits Conclusion ©CypherCrescent Ltd.

3 Overview of SEPAL-WSS An advanced well schematic management system Easy generation and management of well schematic diagrams. Provides presentation options (charts and reports) and decision analysis tools that aid the engineer obtain useful information about his wells ©CypherCrescent Ltd.

4 WSS Architecture ©CypherCrescent Ltd.

5 Maximum Allowable Annular Surface Pressure ©CypherCrescent Ltd. MAASP is the highest pressure that an annulus will be exposed to, beyond which the integrity of some elements in that annulus will be compromised MAASP Evaluation Requires  Well Completion Configuration information  Mechanical Performance Specification of all the components in the well completion  Annuli properties including cement information

6 COMMON MAASP CALCULATION CHALLENGES ©CypherCrescent Ltd. Lack of relational database for well schematics Insufficient/ inaccurate well data for calculation Uncertainty in the type of fluid above TOC Cumbersome Excel spreadsheets Non-standardization of MAASP variab les Multiple Well Scenarios for MAASP calculation & recalculation

7 Consequences: Every Operator fears ©CypherCrescent Ltd. Harm to People Asset Damage Environmental Effect Impact on Company’s reputation Penalties

8 No More... ©CypherCrescent Ltd. Running around for data Use of calculators Multiple Excel Spreadsheets Time spent on calculations Irregularities in MAASP results

9 We Offer.. ©CypherCrescent Ltd. Basic 4 step approach Based on ISO Standards Easy to Use Accurate results Robust database of casing and tubing pressure ratings Option for client to define their own MAASP functions Generate Well Schematic Enter Engineering Properties Enter Wellhead rating & Annulus Data Display MAASP

10 MAASP: Our 4 Steps ApproachStep 1: Generate Well SchematicStep 2: Enter Engineering PropertiesStep 3: Enter Annulus Data Step 4: Enter Wellhead Rating ©CypherCrescent Ltd.

MAASP IN WSS… 11 ©CypherCrescent Ltd.

12 Reports ©CypherCrescent Ltd.

13 Reports ©CypherCrescent Ltd.

14 MAASP Customization: showing scripts ©CypherCrescent Ltd.

15 MAASP Customization: Results ©CypherCrescent Ltd. Customized to suit operators standards and requirements Change default report format to suit client needs Interoperability feature enables interaction with other applications

16 Benefits ©CypherCrescent Ltd. Time savings in creating & managing hundreds of well schematics Transparent, consistent and auditable way of managing MAASP Support company’s HSE/Operational policies Easy integration of data from other sources Quicker planning schedules & estimation of workover requirements Deliver MAASP projects within shortest possible time

17 Conclusion ©CypherCrescent Ltd. Represents a shift towards good practices Simplifies a very complex and error prone workflow Clients can define their MAASP functions In addition to MAASP, obtain comprehensive status diagrams for all wells Centralized database for managing schematics

18 Appreciation THANK YOU ©CypherCrescent Ltd.

i WSS Sample Schematics ©CypherCrescent Ltd.

ii MAASP Values Calculation for Annulus A ©CypherCrescent Ltd. Examples of two different A- annuli, for calculating MAASP

iii MAASP Calculation Equations for Annulus A ©CypherCrescent Ltd.

iv MAASP Values Calculation for Annulus B ©CypherCrescent Ltd. Examples of two different B- annuli, for calculating MAASP

v MAASP Calculation Equations for Annulus B ©CypherCrescent Ltd.

vi Nomenclature ©CypherCrescent Ltd.