RE: A new low27 Mar 2022 12:35
I'm not clear what you mean npwarf.
Are you insulting Moagi and me OR everybody else including yourself?
If your post is in context then the sp is not a new low.
But why am I responding to you? I am filtered.
For the rest of you , a list of pros and cons , would reveal how far TLOU have moved. Putting Hydrogen, Orapa and Crypto to one side - the company has everything under control from permissions, contractors for a Serowe link, funding for that link , and we are resuming dewatering whilst considering new wells.
I am trying to find whether dewatering can end with a sudden cut off , or if it water will diminish slowly and over what period.
This extract reiterates what we already know ..... it might be news to some!
"Coalbed Methane (CBM) is methane gas that is formed naturally during coalification process and trapped within the coal matrix. CBM
reservoirs are usually naturally fractured, low pressure, water saturated gas reservoir. During the progression of coalification from peat to
anthracite, methane and water may be generated.
*The amount of water produced from most CBM wells is relatively high compared to conventional natural gas wells because coal beds contain many fractures and pores that can contain and transmit large volumes of water.
The water in coal beds contributes to pressure in the reservoir that keeps methane gas adsorbed to the surface of the coal (Rice and Nuccio, 2000).
Initially, the natural fractures of the coal are typically water saturated. At undersaturated conditions, when reservoir pressure is above critical
desorption pressure, ** only water is produced **.
*This water has to be removed in order to achieve any significant gas production. Dewatering of the coal seam reduces the hydrostatic pressure of the reservoir, which allows the gas to be desorbed from the coal matrix.
*At the same time, lowering the water saturation level of the reservoir increases the relative permeability of gas, thereby permitting the desorbed gas to flow to
the wellbore.
Proper dewatering of CBM wells is the key to efficient gas production from these reservoirs.
The time required in dewatering stage can last for several months to several years, depending on the level of maturity and moisture content of the coal formation (coalification) itself.
**Dewatering processing consumes much time and it is not effective for well development time.
*?The problem encountered during dewatering processes is to determine the time of gas began to flow where the reservoir is still undersaturated condition.
In this paper, the authors would like to recognize dewatering time using time-pressure correlation. tbc
setiawan looks similar to one of out poster's handle :O)
https://www.searchanddiscovery.com/pdfz/documents/2012/41018setiawan/ndx_setiawan.pdf.html