Different pressure drops across 2 reservoirs

vijaysin2000

Published on 12-17-2010 02:40 AM

3 Comments

Dears,
We operate a well producing gas from 2 different layers. The upper layer produces about 47mmscfd clean gas whereas the lower layer produces about 8mmscfd with 2000bbls of water per day. Total production from the well is about 55 mmscfd.

The well started producing from both layer about 1.5 yrs back. The pressure drops in the lower layer (say L2) is about 725 psi whereas in the upper layer is only 140 psi. The two layers are about 350m apart. (@ 1700m and 2050m)

Production is made through smart completion. My belief is that the pressure drop in both the sections should be more or less equal unless the permeability in the upper layer is drastically low; which is not the case.

Does any one have experience and share the reasons.

Cheers
Vj

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3 Comments

taufiq_petro - 12-20-2010, 06:17 AM
- Reply
Dear,

As far as I know gas reservoir with aquifer has higher pressure drop than gas reservoir without aquifer. because water flow blocks gas flow. CMIIW

Regards

edward hoffman - 12-30-2010, 12:38 AM
- Reply
i am a petroleum geologist i just started reservoir studies2 months ago. It is important to bare in mind whether the 2 productive layers are connected or not.according to my understanding the water cut in the lower layer is due to the presence of the well in an area close to the aquifer that naturally emerges as production goes on.
please i dont wanna talk non sense, so give us the form of the reservoir(structurally speaking) and if there is a connection between the 2 layers(are they connected?).

FOXNEW - 01-05-2011, 03:23 PM
- Reply
Pressure drop in the reservoir can be a result of many reasons, you mentioned that the two layers are not in communication (350 m apart)
- Initial GIIP of each layer.
- Cum. production of each layer.
- Permeability of each layer.
- Transmissibility (which is a reflection of permeability).
- Facies distribution (Layer continuity).
- Existance of aquifer.
- Reliability of reservoir pressure measurment.

every point of the mentioned can be discussed in details and it is depent on the case.

Regards

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