Application of techniques of 3D geological and hydrodynamic modeling in designing of UGS in water-

bearing structure with discontinuous faults (Shatrovskoye uplift).

Shulkova L.A., Skosyrev А.V., Novoselova R.V.

OJSC “VNIPIgazdobycha”, the city of Saratov, Russia

OJSC “VNIPIgazdobycha”

OJSC “VNIPIgazdobycha”

Ш а т р о в с к а я п л о щ а д ьС т р у к т у р н а я к а р т а п о к р о в л е

в и к у л о в с к о й с в и т ы

У с л о в н ы е о б о з н а ч е н и я :

А б с о л ю т н а я о т м е т к а к р о в л и в и к у л о в с к о й с в и т ыИ з о г и п с ы п о к р о в л е в и к у л о в с к о й с в и т ыП р е д п о л а г а е м ы е и з о г и п с ы п о к р о в л е в и к у л о в с к о й с в и т ы

У с т ь е с к в а ж и н ыН о м е р с к в а ж и н ы

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1

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Ш а т р о в с к а я п л о щ а д ьС т р у к т у р н а я к а р т а п о к р о в л е

в и к у л о в с к о й с в и т ы

У с л о в н ы е о б о з н а ч е н и я :

А б с о л ю т н а я о т м е т к а к р о в л и в и к у л о в с к о й с в и т ыИ з о г и п с ы п о к р о в л е в и к у л о в с к о й с в и т ыП р е д п о л а г а е м ы е и з о г и п с ы п о к р о в л е в и к у л о в с к о й с в и т ы

У с т ь е с к в а ж и н ыН о м е р с к в а ж и н ы

- 5 2 0 . 3

1

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Shatrovskaya area Contour map along the top

of vikulovskaya suite

Legend:

Well head

Well #

Elevation of vikulovskaya suite top

Isohypses along the top of vikulovskaya suite

Shatrovskaya area

Composite geological section

OJSC “VNIPIgazdobycha”

Factors taken into consideration during designing of

UGS: • Occurrence of fault system and lithologic “windows” that condition the hydrodynamic connection of reservoir beds with different petrophysical properties;

• Heterogeneity of petrophysical properties of reservoirs along the structure area;

• Occurrence of a formation having boundary reservoir

properties above the first reservoir bed

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Well 3 Well 1 Well 2

Well 7 Well 1 Well 8

Geological profile in the line of wells 3,1,2

Geological profile in the line of wells 7,1,8

The results of modeling were used to solve the following problems:

• Determination of gas volume in UGS;

• Efficient location of operational wells within the structure, considering reservoir properties of the reservoir-beds and

providing for maximum use of a trap;

• Definition of optimum conditions for artificial gas storage formation, considering differentiated injection;

• Minimization of risk of gas spreading over the closing

isohypse;

• Organization of efficient observing system to follow

formation process of artificial gas storage;

• Determination of gas balance in UGS, considering gradual saturation of condensed differences.

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Shatrovskoye UGS

Gas saturation map

closing isohypse along the reservoir top

exploratory well

operational well

S gas

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OJSC “VNIPIgazdobycha”

Shatrovskoye UGS

Gas saturation profile

Closing isohypse along the

reservoir top

S gas

OJSC “VNIPIgazdobycha”

Shatrovskoye UGS

Gas saturation profile

Closing isohypse along the reservoir top S gas

OJSC “VNIPIgazdobycha”

Different options including strings perforation were studied in order to define the best option for production mode of the

three-formation deposit:

• in the interval where only reservoirs of the upper reservoir bed are deposited,

• joint perforations of layers,

• differentiated injection and extraction according to the

formations.

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Shatrovskoye UGS

Gas saturation map along formation I

(differentiated injection)

closing isohypse along the reservoir top

exploratory well

operational well

S gas

OJSC “VNIPIgazdobycha”

Gas saturation map along formation II

(differentiated injection)

closing isohypse along the reservoir top

exploratory well

operational well

S gas

OJSC “VNIPIgazdobycha”

Shatrovskoye UGS

OJSC “VNIPIgazdobycha”

Shatrovskoye UGS

Arrangement of observation wells on formation III

exploratory well

observation well

S gas

closing isohypse along the reservoir top

fault line

OJSC “VNIPIgazdobycha”

Shatrovskoye UGS Diagrammatic geological profile of the upper part of the section

check water-bearing horizon

impermeable horizon

w3 w1 w2

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Shatrovskoye UGS 3D model of the upper part of

the section

top of check horizon II

top of check horizon III

top of check horizon I

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Shatrovskoye UGS Contour map along the top of check water-bearing horizon

design check well

OJSC “VNIPIgazdobycha”

• Efficient location of production wells within the structure, considering reservoir properties of the reservoir-beds and providing for maximum use of a trap;

• Determination of optimum conditions for artificial gas storage formation, considering differentiated injection;

• Minimization of risk of gas spreading over the closing isohypse;

• Organization of efficient observing system to follow the artificial gas deposit formation;

• Determination of gas balance in UGS, considering gradual saturation of condensed differences (of siltstone formation).

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Thanks for your attention.

OJSC “VNIPIgazdobycha”

Institute “VNIPIgazdobycha”, Saratov, Russia.

Rimma Novoselova