Rapidly opening the wellhead valves on a high pressure well flowing into a low pressure collection system is a good way to ruin a well when the following two criteria are met: • The wellhead choke is large. • The well has been shut-in for a while. The surge of gas flow resulting from following… Read More »
We are assuming that the reservoir pressure and porosity are adequate — that is, there is a plentiful supply of gas in the ground for the well to draw on. Also, we are assuming that the permeability of the reservoir is sufficient to allow a relatively free flow of gas to the perforations in the… Read More »
There are three basic problems which reduce the flow of gas from a well which has a sufficient gas pressure, porosity and permeability in the surrounding sand formation to sustain a much higher production rate: 1. Restriction to flow down hole such as occurs when sand covers the perforations in the casing. 2. Liquid loading… Read More »