13 Sep, 2021

Onshore Gas Gathering Systems – Concept Selection, Basic Design & Operation (Part 3)

There are several “non-metallic” options for gas gathering system applications. To a large degree, non-metallics eliminate the corrosion concerns – both internal and external – associated with metallic – typically carbon steel – pipelines.

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30 Aug, 2021

Onshore Gas Gathering Systems – Concept Selection, Basic Design & Operation (Part 2)

In some cases, a choke/line heater is required at the wellsite to deal with the large JT expansion cooling effect experienced by choked high-pressure wells, especially during start-up. This is a somewhat different application than prevention of hydrates in the GGS but there are some common aspects to the equipment utilized. First, the hydrate temperature of the flowing wellstream is estimated. From Figure 1, for 0.65 SG gas and assuming any free water present is condensed/fresh water, the estimated hydrate temp at an assumed average GGS pressure of 1,100 psig is ~ 65 F.

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24 Aug, 2021

Onshore Gas Gathering Systems – Concept Selection, Basic Design & Operation (Part 1)

Part 1 : Shale gas is typically considered an “unconventional” resource, along with tight gas and coalbed methane. Of these three, coalbed methane (CBM) has several characteristics that make it quite different than shale gas and tight gas, including: shallow depth, low pressure and temperature, and the need for a significant early life “de-watering” stage. As a result, CBM developments have some considerably different aspects to them and will not be discussed further in this article.

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1 May, 2021

The Diffusivity Equation

The theory of well testing begins with an understanding of fluid flow in porous media. In this article, the continuity equation, Darcy’s law, and equation of state for a slightly compressible liquid are used to develop the diffusivity equation, describing single-phase flow of a slightly compressible liquid.

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1 Mar, 2021

Introduction to Well Test Interpretation

This article gives an overview of the types of well tests, well test applications, and the objectives of well test interpretation.

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