Abstract
In order that the physical - chemical interaction of the injection water with the porous-permeable or fissured medium of reservoirs do not lead to their degradation, it is necessary that the waters to meet a number of quality conditions. The treatment and conditioning of the injectable waters is imperative to do so due to the fact that their provenance is different, such as reservoir waters, wastewater resulting from various operations – petroleum operations, meteoric waters, etc. and, in particular, due to the very large volumes of injected water. Failure to follow the steps associated with the water treatment process inevitably leads to premature reduction of the injection wells receptivity. This aspect, as well as another, will be analysed in the context of this article. The injection of water in different geological formations, usually highly depleted, is a connected and defining one in the process of extraction of natural gas from reservoirs. The claim is based on the fact that the very large volumes of reservoir water taken from natural gas stream must be stored safely, otherwise their free discharge would create a real ecological catastrophe
Highlights
The treatment of increasing quantities of water to be injected into the earth's crust should be done at least for two reasons, one of which is related to the preservation of the integrity of the perforated area of the injection well, and the second reason is to maintain the receptivity as long as possible of the collector by non-clogging of its pores, collector rock being usually made up from a porous-permeable environment
This phenomenon occurs against the background of the ion exchange that occurs between the injection waters and these clay minerals
The personal observations made on the site, over the years, regarding the volumetric percentages of the waters that make up a cubic meter of injectable water, are as follows: between (90-95)% is the origin of the reservoir water from different productive horizons or different reservoirs, (3-5)% surface water or reservoir water used in various petroleum operations, and the rest, by a few percent, from meteoric water
Summary
The treatment of increasing quantities of water to be injected into the earth's crust should be done at least for two reasons, one of which is related to the preservation of the integrity of the perforated area of the injection well, and the second reason is to maintain the receptivity as long as possible of the collector by non-clogging of its pores, collector rock being usually made up from a porous-permeable environment. The personal observations made on the site, over the years, regarding the volumetric percentages of the waters that make up a cubic meter of injectable water, are as follows: between (90-95)% is the origin of the reservoir water from different productive horizons or different reservoirs, (3-5)% surface water or reservoir water used in various petroleum operations, and the rest, by a few percent, from meteoric water. Of these three categories of water, the reservoir water is the one that has a complex chemical composition to which mechanical impurities in the form of fine particles are added.
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