Completion and Workover

INTRODUCTION

Workover is performed after the initial completion to re-establish commercial production or injection, repair of a mechanical problem in the well, or plug and abandon the well. Workover operations are usually initiated as hydrocarbon production rates decline substantially. Undesired fluid production could be the result of a poor primary cement job or water/gas coning. These workovers typically involve a remedial cement job to control the unwanted water/gas production.

Well completion is performed at the completion of drilling operations to establish initial production from or injection into a well. Procedures of completion will vary depending on the completion type and the area. For example, flowing wells can simply be perforated and put on production. Low reservoir pressure areas often require an artificial lift mechanism (rod or submersible pump, gas lift valves, etc.) to produce at economic rates.

OBJECTIVES

• Plan, design, manage and execute completion operation.
• Improve the overall operational performance during workover operations.
• Select or recommend completion equipment for given field conditions and applications.
• Select the most commonly used downhole tools and explain their function.

COURSE OUTLINE

DAY 1

• Types of Completions
• Introduction
• Wellhead Configuration
• Functional Requirements of a Completion
• Completion Equipment
• Expansion Joints
• Sub-Surface Safety Valves
• Christmas Trees and Its Types
• Surface Equipment

DAY 2

• Reasons for Workovers and Well Preparation
• Formation Damage
• Sand Control
• Hydraulic Fracturing
• Mechanical Problems
• Well Preparations for Work Over
• Tree and BOP Removal / Installation

DAY 3

• Overview of Surface and Subsurface Wellbore Equipment and Procedures
• Blowout Preventer Stacks and Components
• Work String and Production Tubing
• Auxiliary Well Control Equipment
• Preparing for Well Entry
• Wireline Open Hole Operations
• Contingency Procedure for Wireline
• Contingency Procedures for Coiled Tubing
• Contingency Procedure for Coiled Tubing

DAY 4

• Barriers, Completion and Workover Fluids
• Philosophy and Operation of Barrier Systems
• Pressure and Volume Relationship (Boyles Law)
• Workover / Completion Fluid Functions
• Liquids and Fluid Properties
• Testing of Downhole Completion Equipment
• Testing of Well Control Equipment Connections
• Well Control Drills

DAY 5

• Well Shut-in and Well Kill Considerations
• Well Control Problems
• Objective of Well Control Techniques
• Reverse Circulation
• Handling Kill Problems
• Potential Impacts of a Well Control Event
• Personnel Assignment
• Plan Responses to Anticipated Well Control Scenarios
• Blockages & Trapped Pressure in Tubing / Wellbore
• Blockage & Restricted Access in Tubing / Wellbore
• Natural Flowing and Artificial Well Work Over Programs