Well Testing and Cleanout (Mobility Oil and Gas)

Training Hours        

25 Training Hours (9:00 AM to 2:00 PM daily)

Overall Program Objectives

1.     Understand Well Diagnostics: Enable participants to design, execute, and interpret various types of well tests (transient and stabilized) to accurately determine reservoir parameters, well condition (skin factor), and fluid properties.

2.     Master Remedial Operations: Equip participants with the knowledge to identify the causes of well damage/decline (Scale, Sand, Paraffin, Asphaltene), select the appropriate cleanout method, and safely execute the operation (especially using Coiled Tubing).

3.     Optimize Performance: Use the diagnostic results from well testing to inform and evaluate the success of the cleanout and stimulation efforts, ultimately maximizing well productivity and longevity.

Course Content (Outline):

Day 1 – Fundamentals of Well Performance & Well Testing Design

·       Flow Fundamentals: Reservoir fluid properties, Darcy's Law, and the Diffusivity Equation.

·       Well Performance: Productivity Index (PI), Inflow Performance Relationship (IPR), and the role of Skin Factor.

·       Test Objectives & Types: Why we test (Reservoir characterization, well health), types of tests (Drawdown, Build-up, DST, Interference).

·       Test Design: Designing a well test: shut-in time, flow period, and required data acquisition.

Day 2 – Pressure Transient Analysis (PTA) & Interpretation

·       Test Execution: Downhole and surface equipment (Gauges, Separators, Flowmeters). Safety and quality control (QA/QC) of data.

·       Diagnostic Plotting: Introduction to the semi-log and log-log (Diagnostic Plot) and the Pressure Derivative.

·       Flow Regimes: Identifying key flow regimes (Wellbore Storage, Radial Flow, Boundary Effects).

·       Interpretation: Calculating Permeability, Skin Factor and Reservoir Pressure.

·       Advanced Models: Overview of testing for fractured, horizontal, and layered wells.

Day 3 – Well Damage Mechanisms & Diagnosis

·       Sources of Decline: Identifying the primary causes of production decline (Formation Damage, Casing Failure, Fluid Blockage).

·       Damage Types: Detailed study of common damages: Scale (Carbonate, Sulphate), Asphaltene and Paraffin deposition, and Sand production.

·       Diagnostic Tools: Using production logs (PLT), cased hole logs, and chemical analysis to confirm the damage type and location.

·       Pre-Job Planning: Fluid compatibility testing and safety data sheet (SDS) review for chemicals.

Day 4 – Well Cleanout and Remedial Operations (Coiled Tubing Focus)

·       Cleanout Philosophy: When and how to intervene (workover vs. coiled tubing).

·       Coiled Tubing (CT) Applications: CT equipment setup, limitations (reach, fatigue), and advantages for cleanout.

·       Acidizing: Matrix acidizing (Sandstone, Carbonate) for damage removal. Fluid selection and placement techniques.

·       Mechanical Cleanout: Using jetting tools and milling for scale removal, cement plugs, and debris.

·       Cleanout Fluids: Selection of displacement and lift fluids (Nitrogen, Foams, Brines) for effective debris removal.

Day 5 – Post-Job Evaluation, Safety, and Case Studies

·       Post-Job Testing: Conducting a flow test or short build-up (mini-test) after cleanout to measure the improvement in PI or skin factor.

·       Economic Evaluation: Cost-benefit analysis of the cleanout operation; measuring the increase in net present value (NPV).