Well Test Analysis

Pressure transient testing from first principles: the diffusivity equation, drawdown and buildup analysis, the Bourdet derivative and diagnostic plots, wellbore storage and type curves, faults and reservoir limits, dual-porosity and layered reservoirs, fractured horizontal wells and rate-transient analysis, gas deliverability, falloff and step-rate tests on disposal wells, and test design with interference testing and deconvolution, applied to Bakken and Mission Canyon wells in North Dakota and an Inyan Kara Class II disposal well under NDIC rules.

PET-360 Year 3 3 credits 12 lessons · 3 h 47 min ▶ Video lessons coming soon

Offered by HSM University · Petroleum Engineering

This is the American version of this course. See the Canadian version.

What you'll learn

Explain what a well test measures, describe the main test types and equipment, and state test objectives in terms of the decisions they support.
Derive the radial diffusivity equation, use dimensionless variables and the line-source solution, and apply superposition in space and time.
Analyze a drawdown on a semilog plot to find permeability-thickness and skin, and convert skin into an additional pressure drop and flow efficiency.
Analyze buildups with Horner and MDH plots, estimate p*, choose the effective producing time and correct p* to the average drainage-area pressure.
Compute and read the Bourdet pressure derivative on log-log diagnostic plots, identify flow regimes from their signatures and recognize non-uniqueness.
Quantify wellbore storage, use storage-and-skin type curves to estimate kh, C and skin, and separate partial-penetration skin from damage.
Identify sealing faults, channels, constant-pressure and closed boundaries, estimate distances with image wells and the radius of investigation, and design a reservoir limit test.
Interpret dual-porosity responses with the Warren and Root model, estimate ω and λ, and distinguish layered and radial composite reservoirs.
Analyze fractured vertical and multistage horizontal wells through bilinear and linear flow, and apply rate-transient analysis to production data.
Use pseudo-pressure and rate-dependent skin in gas well tests, and analyze flow-after-flow and isochronal deliverability tests with the back-pressure and LIT methods.
Analyze injectivity and falloff tests, interpret step-rate tests for formation parting pressure, and explain why injection pressures are regulated.
Design a well test from its objective, plan interference and pulse tests, explain deconvolution, and write an integrated interpretation report with uncertainty ranges.

Course content

12 lessons · 3 h 47 min total · final exam

1 Why test wells: objectives and test types 22 min · quiz
2 The diffusivity equation and dimensionless variables 21 min · quiz
3 Drawdown test analysis 20 min · quiz
4 Buildup test analysis 19 min · quiz
5 The pressure derivative and diagnostic plots 16 min · quiz
6 Wellbore storage, skin and type curves 17 min · quiz
7 Boundaries and reservoir limits 19 min · quiz
8 Naturally fractured and layered reservoirs 16 min · quiz
9 Hydraulically fractured wells and rate-transient analysis 19 min · quiz
10 Gas well testing and deliverability 20 min · quiz
11 Injection, falloff and step-rate tests 19 min · quiz
12 Test design, interference testing and the capstone interpretation 19 min · quiz
E Final exam 20 questions

Requirements

PET-320 Reservoir Engineering I

Recommended background. You can start any course at any time.

Description

Part of the Engineering stream, typically taken in year 3.