UA46111C2 - METHOD OF OPERATION OF UNDERGROUND STORAGE OF GAS CREATED IN PENETRATIVE LAYER - Google Patents

Abstract

A method of made in a penetrating pool gas storage operation may be used in the gas industry for the underground gas pools operation in the penetrating pools. The method includes the gas pumping through the discharging bore-holes into the pool and extracting the gas from the pool together with water. On the surface water is separated from the gas by a separator and discharged into the water containing part of the penetrating pool under its gas providing part concurrently with the gas extraction. For discharging the water the same discharging bore-holes as for the gas pumping are used. The method shortening the operation cost, and it becomes possible due to the same bore-holes usage as for gas, as for the water discharging, and by using the pool water as a buffer fluid to maintain pressure in the pool needed for the gas extraction. And more to it, the highly mineralized water of the pool returning back into the penetrating pool solves the problem of its utilization and increases the ecological safety of the gas storage.

Description

Description of the invention

The invention relates to the gas industry and can be used in the operation of underground gas storages 2 in permeable layers.

There is a well-known method of maintaining formation pressure during the development of oil fields by pumping water through specially drilled wells (K.M. Dontsov. Разработка нефтяных месторождений. M., Nedra, 1977, p.99-167).

There is also a known method of injecting water into an underground gas storage to prevent its spreading beyond the 70 trap and, at the same time, maintaining formation pressure in the gas storage (N.G. Aslanov, V.M. Shyshlin, etc.

Operation of the Gatchyna underground storage facility. ROS "Transport and gas storage", vp. 7, 1971, p. 27-31).

The disadvantage of these methods is the high operating costs that arise as a result of the need to drill additional injection wells for water injection.

Another method of operating an underground gas storage is known (AS USSR Mo722805 IPC 4 B6505/00 publ. 12 03/25/1980 bull. Mo11), which includes drilling production and injection wells, injecting gas into the porous layer through wells located in the vaulted part of the layer, and injection of the buffer fluid into the specified layer through wells located in the submerged part of the layer. Moreover, a liquid hydrocarbon is used as a buffer fluid. Injection of gas and liquid hydrocarbon is performed simultaneously.

The disadvantage of this method is the high operating costs, which arise due to the need to drill a large number of wells to inject the liquid and the need to use expensive hydrocarbon as a buffer fluid.

A well-known method of capturing flow-through gas in an underground storage, accepted by us as a prototype (patent

of Russia Mo2097295, MPKb 865055/00 publ. 27.11.1997), which includes drilling a network of unloading wells and differentiated water injection and withdrawal. Unloading wells are drilled up to c 22 of the permeable horizon, which is located higher and accumulates flow-through gas. Through them, the gas-water mixture is taken off, which is separated into gas and water on the surface, and then water is pumped back into this permeable layer.

The disadvantage of this method is that the injection of water into the reservoir, which is located above the main permeable reservoir, does not affect the gas deposit in this main permeable reservoir and does not support the reservoir pressure (7) in it, which is necessary for gas withdrawal from the storage. The second disadvantage is that this method increases "-- operational costs due to the need to drill a network of discharge wells.

The basis of the invention is the task of developing a method of operating an underground gas storage, which ensures the maintenance of formation pressure in the gas deposit and at the same time does not require the drilling of additional Ge) wells. 3o The task is solved by the fact that in the known method of operating an underground gas storage, Z created in a permeable layer, which includes pumping gas through injection wells into the layer, withdrawing gas from the layer together with water, separating water from gas on the surface, and then injecting water again into the permeable layer, according to the invention, water is injected into the layer only into the water-bearing part of the permeable layer below its gas-bearing part at the same time as gas is withdrawn from it, while water C 70 is pumped through the same injection wells that are used for gas injection. c The proposed method is explained by the diagram (see fig.) where 17 is the gas-saturated part

From" formation, 2 - production well, Z - plume, 4 - separator, 5 - water pipe, b - water tank, 7 - compressor, 8 - water pipe, 9 - injection well, 10 - water-bearing part of the formation.

Gas, together with water, is taken from the gas-saturated part of the formation 1 through production wells 2 and 49 and fed through the loops З to separator 4. In separator 4, water is separated from gas. Through water pipe 5, water is supplied to tank b, then to compressor 7, and then through water pipe 8 through well 9, it is pumped into the water-bearing part

Ge") of layer 10.

An example of the implementation of the method. As a possible object of application, you can consider the Olyshivsk PSG, which is created at a depth of 580 m in a permeable layer, the upper part of which is saturated with gas, and the lower part is filled with water. -k 70 For its operation, injection and production wells were drilled and equipped, through which gas is pumped into the reservoir. Gas extraction is carried out from the gas-saturated part of the formation only through production wells. During the extraction season, about 10,000 m of reservoir water is extracted together with gas, which will be returned through injection wells to the water-bearing part of the reservoir.

The technical result is a reduction in operating costs, which is made possible by using the same 99 wells for gas and water injection and by using formation water as a buffer

HF) fluid that maintains the pressure in the formation necessary for gas extraction. In addition, the return of 7 highly mineralized formation water to the permeable formation solves the problem of its disposal and increases the environmental safety of the gas storage.

Claims (1)

The formula of the invention The method of operation of an underground gas storage created in a permeable layer, which includes pumping gas through injection wells into the layer, withdrawing gas from the layer together with water, separating water from bo gas on the surface, and then injecting water back into the permeable layer, which is characterized by the fact that water is injected into the formation only in the water-bearing part of the permeable formation below its gas-bearing part at the same time as gas is withdrawn from it, while water is injected through the same injection wells that are used for gas injection. 6) «- «- «- (Se) « - with . and? sh» (o) - - 70 - ime) 60 b5