Method of underground gas storage operation

FIELD: oil and gas industry.

SUBSTANCE: invention is related to the area of oil and gas industry and intended for operation of underground gas storage (UGS) operation. At UGS with arranged producers with storage collector opening cyclic injection of natural gas is made with creation of its buffer and active volume and extraction of the gas active volume. In process of the UGS operation carbon dioxide in injected to the lower part of the storage thus replacing natural gas in the buffer volume. At the end of natural gas extraction cycle the boundary line of carbon dioxide and natural gas reaches the lower openings in the perforation interval of the producers.

EFFECT: invention ensures increase in active volume of stored natural gas in the UGS and reduction of costs for formation of the buffer volume.

 

The invention relates to the field of oil and gas industry and is intended for the operation of underground gas storages (UGS).

The known method of operation of the underground storage of natural gas in reservoirs, including the injection of the buffer gas volume and cyclic injection and selection of the active gas volume, and after the extraction/injection of the active gas volume determine the value of the current reservoir pressure in the storage, when the value of this pressure is below the minimum/maximum design pressure in the reservoir additionally inject the inert gas to the extent that the increase in the value of the current reservoir pressure to the design values, the inert gas using nitrogen, carbon dioxide or any other gas that does not contain components that can react with equipment and the medium reservoir (a utility model Patent of Ukraine # 40544, 10.04.2009).

The main disadvantage of this method is that during the operation of UGS need a certain amount of inert gas (e.g. carbon dioxide)required for one-time downloads and maintaining UGS design values of reservoir pressure.

The technical task of the invention is to increase the active volume of stored natural gas in underground storage facilities, the decline in the cost of educating its buffer volume and disposal of carbon dioxide as industrial waste.

The technical problem is solved due to the fact that in the method of operation of the underground storage of natural gas, including the construction of wells with the opening of reservoir storage, cyclic injection into the natural gas storage facilities with the creation of the buffer and the active volume, the selection of the active volume of natural gas and injection into storage of carbon dioxide with the replacement of a part of the buffer volume of natural gas during operation of underground gas storage the total amount of carbon dioxide pumped so that at the end of cycles of selection in natural gas boundary carbon dioxide and natural gas in storage reached the lower intervals of the opening of the reservoir development wells, used for gas extraction.

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. UGS operation 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 (hermet the durability of the tires of the 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. In UGS in the selection process of natural gas remains a certain amount, depending on geological, technological and other reasons, known as the buffer gas. In UGS always have some amount of natural gas that cannot be delivered to the consumer. Amount of buffer gas can reach half or more of the total volume of gas in storage after the injection cycle. When using the described invention it is proposed to replace part of the natural gas in the buffer volume in storage at non-hydrocarbonaceous gases such as carbon dioxide (CO2). Sources of such gases can serve gases, including non-recyclable and polluting the natural environment, such as smoke, gases, exhaust gases and other

Carbon dioxide is different from natural gas (methane) is significantly greater density and compressibility, so that during its injection into UGS can be initially assume a high speed separation of carbon dioxide and natural gas. To accelerate the process of separation of gases and creating in the storage buffer gas volume due mainly to carbon dioxide serves CO2to download in the lower part of the UGS.

Created in UGS artificial reservoir of natural gas to ora in the selection of gas is developed, and when the gas injection is restored, the bottom can postulates produced water. Because carbon dioxide has a higher density and, in addition, a higher viscosity compared to methane, the buffer amount of CO2in UGS plays the role of a gas piston between formation water and stored natural gas, which prevents premature breakthrough of produced water to production wells in the selection of natural gas and reduces losses due to solubility in formation water in the case of direct contact with it.

Furthermore, it is known that the gas CO2has a much greater solubility in water than methane. So at 40°C the solubility of CO2is 1, and CH4- 0,016 (grams of gas per 1 kg of water). Therefore, for injection into storage of carbon dioxide in the contact area of natural gas with water to a significant portion of the carbon dioxide will dissolve in water to form weak metastabile carbonic acid (H2CO3), and in the selection of natural gas from underground storage facilities with decreasing reservoir pressure carbon dioxide will again return into the gas phase, displacing natural gas production wells.

To produce the injection of carbon dioxide, preferably at the stage of injection of natural gas into underground storage facilities, so for the time UGS to the stage of selection of natural gas is C UGS was stratification of carbon dioxide and natural gas. As injection wells CO2in UGS can be used are available, for example, observation wells, which are linked (perforation interval) reservoir Geology for underground gas storage in contact with formation water, or special wells, specially constructed for this purpose.

The greatest efficiency of the described invention is achieved in UGS, created on the basis of depleted gas fields to gas mode of operation, in which at the time of selection of the gas does not have time to react and move in the pore space of reservoir storage reservoir water. In such UGS ratio of volumes stored in the underground storage of natural gas at the end of the injection buffer and its size is almost equal to the ratio of pressures at the end of the injection and after the selection of gas, so there is a possibility of replacement of natural gas in the buffer volume equal to the pore volume of the storage facilities (including pressure) from the bottom to the perforated interval of wells used at the end of the sampling cycle natural gas.

An example implementation of the method.

There UGS generated in the depleted gas field gas mode of operation (with low formation water). The maximum reservoir pressure at the end of the injection cycle natural gas (PC) is 10 MPa, the minimum reservoir pressure the s at the end of the sampling cycle gas from underground storage facilities (P O)required for gas supply to the consumer, is 5 MPa. The volume of the pore volume UGS (VP100 million m3, reservoir temperature T=320 K. the Ratio of the pore volume of storage from the plane of the bottom holes of the perforated interval of wells used at the end of the sampling cycle gas until the tires UGS to all of UGS is 0.4. Stored natural gas in storage composition is predominantly methane.

Determine the volume of gas (VCH4), which can be stored in this storage, and the amount remaining in storage after gas sampling, i.e., the amount of buffer gas(VCH4b):

VCH4=VP·PC·TFP/Z·MP·PCT=100·10·293/0,89·320·0,1=10288 million m3,

(VCH4b)=VPPAboutTwith at/ZoTplPwith at=1005293/0,933200,1=4923mln.m3,

where Z - factor cimemas and methane at the end of the injection cycle (Z=0,89) and selection (Zo=0,93) gas at the respective formation conditions; TST, PCT - standard temperature (293 K) and pressure (0.1 MPa).

From the above calculation shows that the amount of buffer gas in storage is 0.48 (4923/10288) of the total volume of stored gas, and the volume of active gas - 5365 million m3.

The proposed method is pumped into the lower part of the underground storage of carbon dioxide so that at the end of the sampling cycle gas its upper border has reached the plane of the bottom holes of the perforated interval of wells, i.e., for our conditions the amount of CO2at the end of the sampling cycle gas will occupy in UGS 0,6 his entire pore volume.

Determined the amount of CO2we can upload in storage:

VCO2=0,6·VP·PO·TFP/ZCO2·MP·PCT=0,6·100·5·293/0,8·320·0,1=3434 million m3,

where ZCO2=0,8 - compressibility factor CO2with a formation pressure of 5 MPa.

According to the found value of defined volume of the pore space storage occupied by CO2at the end of the cycle gas injection:

VCO2P=VCO2TplPwith atZCO2/Twith atPC=34343200,10,4.29310=15 mln.m3,

where ZCO2=0,4 - compressibility factor CO2with a formation pressure of 10 MPa.

The rest of the pore space UGS will take gas (methane)in the volume of stored gas will be:

VCH4'=(VP-VCO2P)PCTwith at/ZCPwith at=(100-15)10293/0,893200,1=8745mln.m3

From this value the buffer gas volume will be:

V'CH4b=0,4VPPAboutTwith at/ZoTplPwith at=0,41005293/0,933200,1= 1969mln.m3,

and active (8745-1969)-6776 million m3.

Thus, UGS with the described settings you have the option to increase the amount of active gas 5365 million m3before 6776 million m3and the amount of buffer gas to reduce 4923 million m3until 1969 million m3. In addition, the proposed method allows to bury 3434 million m3carbon dioxide.

In case of impossibility injection total volume of carbon dioxide per cycle, this operation can be implemented for several cycles of gas injection, while according to the method described in example implementations of the present invention is determined by the volume of the pore space storage occupied by CO2on each cycle of gas injection and volume of the injected natural gas with a maximum value of the injected carbon dioxide at a certain cycle gas injection and the corresponding volumes of stored and active natural gas in underground storage.

Using the proposed method of operation for UGS significantly reduced the volume conservation of the natural gas to create its buffer values, increase the active volume of storage and use, in addition, there is a possibility of disposal (burial) of significant amounts dioxide in the of Lerida or other gases, polluting the natural environment.

A method of operating the underground storage of natural gas, including the construction of wells with the opening of reservoir storage, cyclic injection into the natural gas storage facilities with the creation of the buffer and the active volume, the selection of the active volume of natural gas and injection into storage of carbon dioxide with the replacement of a part of the buffer volume of natural gas during operation of underground gas storages of carbon dioxide pumped for several cycles so that at the end of cycles of selection in natural gas boundary carbon dioxide and natural gas in storage reached the bottom holes of the perforated interval wells collectors used for gas sampling.



 

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