Well Test Analysis - Theory & Practice

1 well Test Analysis - Theory & Practice Designed for: Geologists, drilling engineers, production engineers and reservoir engineers with 1-5 years experience. Objectives: 1. To understand the fundamental principles of well testing 2. To be able to design a well test programme 3. To be able to interpret the results of well test Analysis 4. To be able to use modern software to conduct the interpretation 5. To understand how the results of a test are used by others in the value chain Course Content & Outline: Overview of well testing Types and uses of well testing Designing, selecting equipment, and executing a well test operation Interpretation of well test data Mathematics of radial inflow the radial diffusivity equation Solving the radial diffusivity equation for various boundary conditions Semi-log (Horner Analysis ) techniques for pressure drawdown and build-up Analysis Near wellbore behaviour Productivity Index Skin effects Wellbore storage Boundary effects Influence of boundaries on drawdown and build-up responses method of images Reservoir drainage volumes and average reservoir pressure MBH Analysis Dimensionless Analysis Log-Log Analysis and the use of pressure derivative with time (Type Curve Analysis ).

2 Introduction to Saphir software and regression Analysis Practical use of commercial software (Saphir). Work sessions to use Saphir software Gas well testing The real gas law and gas fluid behavior Log-log and semi-log Analysis using gas pseudo-pressures Special test types Injectivity tests Horizontal wells Fractured well Course Method: Lectures days Lectures are typically 1 hour in duration, followed by a specific exercise on the topic to allow participants to Practice the methods being taught Demonstration Short examples are shown at the end of lectures as a guide to the class exercises and also to the Saphir software Exercises days Exercises are typically 1 hour in duration, and can be performed in small groups of 2-3 participants. These are paper- based and follow each of the lecture sessions Case Study This runs through a selection of the calculator-based examples using an offshore well test to study the justification, design, data gathering, interpretation and reporting Software Workshop 1 day An exercise with Saphir software from Kappa 1 (laptop) computer/ 2 persons required Exercise Saphir 1 participants design an interference test using Saphir software to predict the pressure response in the observation well , and use this to select a gauge type Exercise Saphir 2 participants load a measured data set and use Saphir to interpret reservoir and boundary properties, using the analytical methods (Horner and log-log Analysis ) and the regression feature to optimize their interpretation Exercise Saphir 3 participants use the numerical simulation feature in Saphir to show the pressure response with time in an interference test Course Duration: Duration is 5 days Course Date.

3 Monday December 5th to Friday December 9th 2016. Course Tutor Mark Cook BSc, MBA. Main Series tutoring: Early Development, Business & Risk, Reservoir Enginering Industry experience: over 30 years, reservoir engineering Career background: Shell, TRACS (Director) and AGR (VP). Personal: Author, Hydrocarbon Exploration and Production', SPE distinguished lecturer on Risk Analysis Course Schedule: Morning session Afternoon Session Day 10:00-12:45 1:45- 5:00. (2h45min) (3h15min). Lecture 1 Lecture 2. Introduction to well testing Radial inflow to a well Test types Boundary conditions to solve radial diffusivity Justification of a test equation Day1 Data gathering and gauge selection Transient, semi-steady state and steady state pressure responses Exercise Test justification (Case Study) Line source solution - infinite acting flow Exercise Designing an interference test using line source solution Lecture 3 Exercise Horner Analysis for a pressure build-up Semi-log drawdown Analysis (Case Study).

4 Pressure drawdown in transient flow Lecture 5. Day2 Exercise Semi-log Analysis for a pressure Near wellbore behavior drawdown Productivity index Causes and remedies for skin Lecture 4 Wellbore storage Principle of superposition Horner Analysis for pressure build-up Exercise calculation of wellbore storage and skin Lecture 6 Lecture 7. Boundary effects Dimensionless Analysis and the log-log plot Method of images Type Curve Analysis Day3. Identifying boundaries on semi-log plot Exercise Log-log Analysis (Case Study). Exercise Calculating distance to boundaries Type curve matching Reservoir properties from log-log plots Lecture 8 Introduction to Saphir software Lecture 9 Test interpretation using Saphir Accessing software and system logic Loading and quality controlling data Test design feature Setting initial reservoir parameters Day4 Exercise Test interpretation Exercise Interference test design Loading data and reservoir parameters Using test design module in Saphir Test interpretation first pass Gauge selection Sensitivity Analysis Improving the match and reporting Lecture 10 Numerical modeling using Saphir Lecture 12 Other test types Demonstration of numerical simulation of Injection tests interference test Slug tests Horizontal well testing Exercise students reproduce numerical model Fractured reservoir well testing on their PCs Lecture 13 Course summary Day5 Lecture 11 Gas well testing Summary of key learning points P squared solution and shortcomings Value of

5 well test information Use of pseudo-pressures m(p). Non-uniqueness examples m(p) solution and advantages Course close-out Exercise 11 Gas well test interpretation Generating the pseudo pressures Using m(p) solutio