1.0 Background

Evolution of Relief Well Technology

The early days

The 1970’s and 1980’s

The 1990's

Quick Relief Well Planning Guide


Other Relief Well Related Publications

Table 1.1: Relief Well Planning Considerations

Figure 1.1: Top Level Relief Well Design and Implementation Process Diagram

Figure 1.2: Generic Relief Well Design Flow

2.0 Well Control Management System



Major Subsystems

Incident Response Management

Training and Drills

Technology Management

Risk Management

Information Management

Figure 2.1: Well Control Management Critical Components

Figure 2.2: Well Control Management Critical Components for Three Levels of Response

Incident Response Features

Incident and Response Levels

Figure 2.3: Example Well Control Incident Evaluation Flow Chart

Figure 2.4: Example Level 3 Incident Response Phases

Well Control Management Justification

Figure 2.5: Time verses Cost, Lost Production/Pollution and Image


3.0 Specific Relief Well Contingency Plans

Hazard Management for Blowout Control

Table 3.1: Simple Impact Matrix

Table 3.2: Example Risk/Impact Matrix

Example Situations of a Blowout having High Impact on an Operating Company

Example Situations with Higher Risk for Well Control Problems

Example Situations Where Quickly Executing a Relief Well May be Difficult

Basic Hazard Management Techniques

Hazard Management Process

Figure 3.1: Example Hazard Event Tree

Risk Assessment

Figure 3.2: Example Framework of Hazard Identification and Assessment

Example Specific Relief Well Contingency Contents

Example Blowout Scenarios

Example Table of Contents for Above Contingency Plan

Well Planning to Facilitate Relief Well Control

Identify High Risk Areas, Structures and/or Wells

Relief Well Contingency Plans

Accurate Well Information

Surface Wellhead Uncertainty

Borehole Uncertainty

4.0 The Initial Planning Cycle

Initial Incident Briefing

Purpose and Timing

Briefing Agenda

Initial Incident Briefing Report

Detailed On-site Incident Assessment

Purpose and Timing


Incident Assessment Report

Archived Data Collection

Purpose and Timing

Guidelines and Personnel Involved

Example Data Requirements - General

Example Data Requirements - Kill Unit

Initial Tactical Operations Planning

Purpose and Timing

Meeting Agenda Guideline

Work Products

Initial Planning Process Guidelines

Purpose and Timing

Initial Planning Objectives

Develop the General Plan

Purpose and Timing

Personnel Involved

General Objectives - Surface Control

General Objectives - Relief Well

Relief Well Guidelines for Drilling - Checklist

5.0 Relief Well Response Organization

Source Control Section

Source Control – Relief Well Branch

Relief Well Branch- Special Services - Intersection Unit

Relief Well Branch- Special Services - Kill Unit

Source Control - Planning Section

6.0 Daily Planning Cycle 6

Source Control Daily Briefing

Relief Well - Intersection Shift Briefing

Relief Well - Intersection Planning Meeting

Relief Well or Surface - Kill Planning Meeting

Relief Well Plan Implementation Checklist

7.0 Initial Strategy – Defining Problems, Constraints and Objectives

Blowout Diagnostics

Figure 7.1: Blowout Diagnostics Flow of Events

Formulate Relief Well Kill Objectives

Define Known and Diagnosed Constraints to Relief Well Intersection and Kill

Define Relief Well Drilling and Geological Hazards and/or Constraints

Define Surface/Seabed Constraints to Rig Placement

Define Position Uncertainty of the Blowout and Adjacent Wells

Define a Primary and Secondary Kill Point for Analysis

Establishing Hydraulic Communication

8.0 Objectives for Relief Well Intersection and Drilling Units

Define Attack Angle and Proximity at Kill Point

Define Homing-in (Casing Search) Strategy

Surface Uncertainty

Borehole Uncertainty

Recommended Number of Relief Wells

Technical Risks to Evaluate

Consequences to Evaluate

Surface Location Determination

Relief Well(s) Trajectory

Specific Drilling Operational Procedures

Relief Well Guidelines for Drilling and Intersection Units - Checklist

Summary of Vector Magnetics Wellspot Service

Principles of Standard Wellspot Operation

Wellspot Capabilities

Strategies for Well Location using Wellspot

Quantifiable Range of the Wellspot Instruments

Table 1: Wellspot Tool Specifications

Figure 12.1: Schematic of Down Hole Current Injection

Figure 12.2: Surface Current Injection

Wellspot RGR Instrument

9.0 Hydraulic Kill Planning Strategy

Modeling the Blowout

Modeling the Kill Hydraulics

Blowout and Kill Model Requirements

Inputs and Data Acquisition

Example Input Data Sheet

Kill Planning Flowchart

Relief Well Guidelines for Kill Planning – Checklist

Relief Well Casing Considerations

Surface Kill Equipment Requirements

High Pressure Pumps and Manifolds

Low Pressure Manifolds and Pumps

Kill Mud Storage and Transfer Equipment

Control and Monitoring Equipment

Kill Platform Analysis and Selection

Relief Well Drilling Rig Requirements (offshore)

Special Equipment and/or Materials for the Operation

Kill Equipment QA and Documentation

10.0 Reference Publications