THE 3
rd
INTERNATIONAL SCIENTIFIC CONFERENCES OF STUDENTS AND YOUNG RESEARCHERS
dedicated to the 99
th
anniversary of the National Leader of Azerbaijan Heydar Aliyev
347
may seem less favorable than annulus injection method due to its costs,
however more commonly engineers are selecting seperate injection well in
order not to risk harming their well (Richard C. Haut, 2007).
With referred to my supervisor practice, this method is broadly known
also in Azerbaijan where BP company implemented this project succesfully.
When selecting proper layer for reinjection, it is important to do some test for
example Leak-off Test and Formation Integrity Test in order to make sure
that fractured and loosy sand involving layer will be applied. In this practice,
Surakhani lay (3 km depth) was selected above which is strong formation is
involved in order not to permit reinjected matter flows into the water seepage.
This is important and complex work to do beacuse if reinjected cuttings flow
into the sea, this will be adverse impact to environment and this is not the
case that is done. So selection of layer should be based on the layer
sequence where target zone consists of loosy sand and soft geological units
and above that layer must be strong enough in oder to seal the injected fluids.
Of course, it is known that as drilling deeper the layers become solider and
stronger due to compaction however some anomalies can occur and this
inversion is important in this injection procedure. Moreover, the reinjected
matter must be lay down and penetrate the faults equally in all directions but
this fracturing must be implemented laterally not vertically above because
vertical direction means reinjected cuttings coming to the surface which is
not desirable consequence of this operation.
The selected formation for discharge have to be mechanically and
geologically insulated from useful water bodies to prevent waste seepage
into the water sources. The involved rock cannot be contain petroleum matter
in significant volumes, however the rock must be satisfactorily porous and
permeable. The procedure is considered as extremely friendly for ecology
and more ecomically viable than the cuttings discharge to onshore (S.R.,
2007). Nevertheless, there are possibble cons and pros of this disposal
technique that are given in tabular form beneath.
Dostları ilə paylaş: