Creation and operation of underground gas storage

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises construction of wells with exposure of geological structure with pods and pool cap, injection of gas into said structure to force formation water downward from pool cap with prevention of gas escape from the boundaries of geological structure and gas extraction from underground storage (UGS) top section. Note here that availability of superhigh-seam-pressure formation water deposits with dissolved and/or dispersed gas is checked in region with geological structure intended for underground gas storage. Production wells are made with exposure of said deposit, water with dissolved and/or dispersed gas is extracted there through and bypassed into aforesaid geological structure. Gas extraction from UGS is carried out after extraction of dissolved and/or dispersed gas from water and their immiscibility. Water with dissolved and/or dispersed gas is bypassed from superhigh-seam-pressure geological structure is carried out as pressure in UGS decreases owing to gas extraction.

EFFECT: use of dispersed and dissolved gas in abyssal aquifers.

1 ex, 1 dwg

 

The invention relates to the field of oil and gas industry and is intended for the production of gas dissolved in the waters of the deep horizons, the establishment and operation of underground gas storage (UGS) in the above-lying geological structures.

There is a method of creation and operation of underground storage of natural gas in a porous and permeable reservoir rock structures, water-saturated, depleted natural gas and gas condensate fields, including drilling or the use of existing production wells, cyclic injection and extraction of gas from underground storage facilities with the formation of the buffer and the active volume of storage (A.I. Sirkowski. Development and exploitation of gas and gas condensate fields. M.: Nedra, 1979, S.255-276).

One of the disadvantages of the known method is that to create UGS uses natural gas from fields located generally at a considerable distance from the geological object selected for UGS. At the same time, there are regions in which in addition to geological objects at relatively shallow depths (e.g., aquifers with lid or depleted oil and gas fields), available at great depths aquifers with abnormally high formation pressure (AHP) with significant reserves of dissolved and dis is ergonovine gas.

The technical object of the present invention is used for UGS dispersed natural and (or) dissolved gas in deep aquifers.

The technical problem is solved by a method for creation and operation of underground gas storage (UGS)facilities, including the construction of wells with the opening of a geological structure with headers having a lid, the pumping of gas into this structure with deformation of the reservoir water down from the tires with regard to prevent the exit of gas beyond the boundaries of the geological structure and the selection of gas from the upper part of the storage consumer, determine the presence in the region with the geological structure designed for storage, at great depths with abnormally high formation pressure reservoir formation water with dissolved (or dispersed gas, construct wells with opening this reservoir is withdrawn from the water with the dissolved (or dispersed gas and perepuskat through a borehole in the geological structure intended for UGS, the selection of gas from storage is carried out after the selection dissolved (or dispersed gas from the water and their stratification, and the bypass water with dissolved (or dispersed gas from geological structures with abnormally high formation pressure in UGS carried out as SN is the manifestation in him of the pressure in the gas selection to the consumer. The invention consists in the following.

Underground storage of natural gas (USG) create in depleted gas or oil fields or in geological structures, the collector of which is filled with water. Subsequent operation of UGS is cyclic injection of natural gas into the reservoir geological structures through constructed wells with achievement values of reservoir pressure, not more than the maximum allowable pressure, which depends on a number of geological factors (tightness tires geological structure, the depth of the structure, the activity of the surrounding aquifer basin and others) and the selection of natural gas from the storage facilities to the consumer as needed. The maximum reservoir pressure in UGS can, as a rule, exceed conditionally hydrostatic not more than 1.5 times. When using the described invention it is proposed to use as a source of natural gas or dissolved (or dispersed gas in the water, which is in the same region as geological structure, designed to create UGS, only at great depths. Often these bearing geological structures with dissolved gas have abnormally high formation pressure (AHP). Therefore, in the construction of wells in these aquifers patterns and connecting them to with whom the vazhiny, built on top of a geological object for UGS, the produced water with the dissolved gas will flow from one object to another due to the difference between the formation pressure. At the top of the object due to the lower formation pressure, dissolved (or dispersed gas is selected from water, and by the difference in densities of the phases will be their separation. When volumes return the fulfilled of water with dissolved (or dispersed gas generated in UGS regulate so that the released gas does not go beyond the boundaries of its geological structure. As education at the top of this geological structure sufficient amount of gas you can start using UGS, i.e. to the supply of natural gas to the consumer. With decreasing reservoir pressure due to gas extraction volumes can be recovered through subsequent bypass water with gas from the bottom of geological object at the top. Thus, the surplus return the fulfilled of water after discharge from her gas may be filtered out beyond the boundaries of the UGS.

The drawing shows a diagram of the method for the establishment and operation of UGS, where: 1 - aquifer with dissolved gas and pore pressure prediction, 2 - a production well, 3 - aquifer intended for UGS, 4 - tire aquifer, 5 - injection well UGS, 6 - a production well UGS, 7 - gas reservoir storage, 8 - Supervisory piezometric well UGS, 9 - lock-adjusting system, 10 - gas pipeline to supply gas from the storage facilities to the consumer.

An example implementation of the method.

In the upper Cretaceous sediments Taman aquifers installed almost in the 2000-meter thick at depths from 3285 up 5215 m Collectors fractured-porous-cavernous type, confined mainly to fernature-cognac-Santonian sediments. Their capacitive-filtration properties are associated with the development of secondary pores and cavities, as well as fractured zones. Water has low mineral content (7-8 g/DM3), bisulfates, high content of carbonates and bicarbonates of sodium. Gas factors upper Cretaceous waters Taman vary from 9 to 67 m3/m3that indicates that in the waters along with contains dissolved and dispersed gases. With flow rates from 400 to 2000 m3/day. high-thermal (120-130C) soda water you receive in each of the tested intervals from 8 to 23 thousand m3of gas per day. In the composition of the dissolved gases is dominated by methane (64-89%) and carbon dioxide (31-9%). Reservoir pressure exceeds conditionally hydrostatic 1.62.0 times.

In the upper part of the geological section in the Miocene deposits of the region at depths from depths of 200 to 400 to 500 meters are anticlinal structure. Once the minimum level of about 30,5-0,7 km with amplitudes up to 90-140 m The reservoir rocks are confined mainly to the deposits Chokrak, Karagan and Sarmatian layers, they are presented carbonate and carbonate-terrigenous differences and relate to porous fractured, porous vuggy fractured, vuggy fractured types thickness of 40-70 m, reservoir pressure does not exceed conditionally hydrostatic.

For the implementation of the proposed method (figure 1) to a depth of 3500-4000 m Buryats or restore from conserved at least one production borehole (2) in the zone of the aquifer with AHP (1) and dissolved gas. According to the results of geological-geophysical studies choose geological structure, having at least one reservoir (3) with the lid (4), suitable for the construction of UGS, and drill one or more injection wells (5) and operational (6) as well as Supervisory piezometric wells (9). Creating and adjusting the depression on the layer with shut-off and regulating system (9), wells (2) select the gas mixture and the pipeline feed it through the hole (5) in the aquifer (3), in which the reservoir pressure below the saturation pressure of the dissolved gases and buffer pressure in the borehole (2). Released from the water gas occupies the Central part of the structure, forming a man-made gas reservoir (7), and degassed in the s with produced water presses down on the unconformity. In the generated UGS is not only storage facility for natural gas, but natural separator fed it gas mixture. The feed mixture is conducted while monitoring the progress of the gas-contact (DDC) in technogenic deposits, mainly on the observations in piezometric wells (8)thus, in order to avoid out-gassing abroad traps. The selection of gas from underground storage facilities lead after the formation of technogenic deposits through wells (6)drilled in the upper part of the trap (UGS) at the stop or simultaneous injection of gas mixture through the injection wells (5).

When using the proposed method for the establishment and operation of UGS involved in the development of significant reserves of natural gas dissolved in formation waters. Thus, in addition to the extraction of natural gas from the generated UGS, is selected disposal of produced water, resulting in increased environmental safety of the process.

The method of creation and operation of underground gas storage (UGS)facilities, including the construction of wells with the opening of a geological structure with headers having a lid, the pumping of gas into this structure with deformation of the reservoir water down from the tires with regard to prevent the exit of gas beyond the boundaries of the geological structure and the selection of gas from the upper part of the UGS will consume the Liu, this determines the presence in the region with the geological structure designed for storage, at great depths with abnormally high formation pressure reservoir formation water with dissolved (or dispersed gas, construct wells with the opening of this reservoir is withdrawn from the water with the dissolved (or dispersed gas and perepuskat through a borehole in the geological structure intended for UGS, the selection of gas from storage is carried out after the selection dissolved (or dispersed gas from the water and their stratification, and the bypass water with dissolved (or dispersed gas from geological patterns with abnormally high formation pressure in UGS perform at least reduce it pressure as a result of selection of gas to the consumer.



 

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EFFECT: higher reliability and trustworthiness.

1 ex

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