WELL ENHANCEMENT

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Well Enhancement

By

International Science and Technology University (ISTU)

(Technology for increasing productive capacities of wells using acid complex in non-active form).

The efficiency of offered technologies is caused with:

1) Acidic mix ingress into low-permeability and oil-saturated inter layers and creation of the new channels owing to the dissolution;

2) Artificially creation of watertight barrier for water influx into the well;

3) The dissolution of the carbons, argil particles and their modification and asphalt-pitch deposits due to the heat release by exothermic reactions of acids;

4) The decrease of emulsification of watery oils;

5) Increase of the dissolution of watery oils.

6) Improvement of filtration flow’s properties into low - permeability reservoirs

The technology uses a new acid composition with increased solvent ability and low corrosion activity in regard to metal elements of the well (owing to protective film created).

The suggested technologies are distinguished from the technology of well stimulation using fracture by ecologically clearness, ability to keep the tightness at cement ring collar behind drill stem, absence of accident rate in the course of well stimulation, ability of long wells operation under the optional mode of operation.

 International experience in increasing of the productivity of producing wells and injection wells by way of influence on bottom-hole zone of the reservoir (BHZS) with aid of different acids indicates absence of efficiency after reiteration of the process. This is explained by following: 

1.Initial treatment of bottom-hole zone of reservoir (BHZS) by hydrochlore removers from carbonate collector up to 25-30 % of carbonate material and to 10-25 % of silicate and anhydride materials. Thus, the channels, which are created in the collection due to the dissolution after several treatments, do not improve the hydrodynamic state of BHZS.

The practice shows that after 4 & the 5 one-typed treatments, the improvement of the               productivity of the wells is not achieved (the processes are proved ineffective).

2. In granular collectors repeated influence on bottom-hole zone by one-typed acid compositions do not lead to positive results.

The efficiency of stimulating the formation with acid complex in non-active form is stipulated     by the following factors:

        -    increasing the sweep volume of acidization of production formation;

        -   reducing viscosity of oil having high content of asphalt/resin matters;

        -   formation of water-soluble salts in reaction products;

        -   liberation of additional heat when changing the acid complex over to active form.

This technology makes provision for subsequent injection of two preliminary – foamed acid compositions into formation bottom-hole.

While pumping the first foam – acid composition through water – saturated part of the formation, as the most permeable, as interaction of acid with formation water takes place resulting in watertight barrier in water – saturated interlayer of the formation.

Then the second foam – acid composition is supplied into the bottom–hole. The properties of the latter composition stipulate selective action on oil/water – saturated interlayer of the formation.

The application of this new technology provides for acid composition entry into dissolution channels.

Artificially created watertight barrier allows then to limit formation water inflow into the well.